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![Junio C Hamano](/assets/img/avatar_default.png)
Code clean-up. * jk/pack-name-cleanups: index-pack: make pointer-alias fallbacks safer replace snprintf with odb_pack_name() odb_pack_keep(): stop generating keepfile name sha1_file.c: make pack-name helper globally accessible move odb_* declarations out of git-compat-util.h
4027 lines
100 KiB
C
4027 lines
100 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*
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* This handles basic git sha1 object files - packing, unpacking,
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* creation etc.
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*/
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#include "cache.h"
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#include "string-list.h"
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#include "lockfile.h"
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#include "delta.h"
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#include "pack.h"
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#include "blob.h"
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#include "commit.h"
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#include "run-command.h"
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#include "tag.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "refs.h"
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#include "pack-revindex.h"
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#include "sha1-lookup.h"
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#include "bulk-checkin.h"
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#include "streaming.h"
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#include "dir.h"
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#include "mru.h"
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#include "list.h"
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#include "mergesort.h"
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#include "quote.h"
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#define SZ_FMT PRIuMAX
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static inline uintmax_t sz_fmt(size_t s) { return s; }
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const unsigned char null_sha1[20];
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const struct object_id null_oid;
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const struct object_id empty_tree_oid = {
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EMPTY_TREE_SHA1_BIN_LITERAL
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};
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const struct object_id empty_blob_oid = {
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EMPTY_BLOB_SHA1_BIN_LITERAL
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};
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/*
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* This is meant to hold a *small* number of objects that you would
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* want read_sha1_file() to be able to return, but yet you do not want
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* to write them into the object store (e.g. a browse-only
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* application).
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*/
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static struct cached_object {
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unsigned char sha1[20];
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enum object_type type;
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void *buf;
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unsigned long size;
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} *cached_objects;
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static int cached_object_nr, cached_object_alloc;
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static struct cached_object empty_tree = {
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EMPTY_TREE_SHA1_BIN_LITERAL,
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OBJ_TREE,
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"",
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0
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};
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static struct cached_object *find_cached_object(const unsigned char *sha1)
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{
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int i;
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struct cached_object *co = cached_objects;
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for (i = 0; i < cached_object_nr; i++, co++) {
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if (!hashcmp(co->sha1, sha1))
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return co;
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}
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if (!hashcmp(sha1, empty_tree.sha1))
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return &empty_tree;
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return NULL;
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}
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int mkdir_in_gitdir(const char *path)
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{
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if (mkdir(path, 0777)) {
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int saved_errno = errno;
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struct stat st;
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struct strbuf sb = STRBUF_INIT;
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if (errno != EEXIST)
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return -1;
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/*
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* Are we looking at a path in a symlinked worktree
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* whose original repository does not yet have it?
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* e.g. .git/rr-cache pointing at its original
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* repository in which the user hasn't performed any
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* conflict resolution yet?
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*/
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if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
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strbuf_readlink(&sb, path, st.st_size) ||
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!is_absolute_path(sb.buf) ||
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mkdir(sb.buf, 0777)) {
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strbuf_release(&sb);
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errno = saved_errno;
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return -1;
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}
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strbuf_release(&sb);
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}
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return adjust_shared_perm(path);
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}
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enum scld_error safe_create_leading_directories(char *path)
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{
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char *next_component = path + offset_1st_component(path);
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enum scld_error ret = SCLD_OK;
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while (ret == SCLD_OK && next_component) {
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struct stat st;
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char *slash = next_component, slash_character;
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while (*slash && !is_dir_sep(*slash))
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slash++;
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if (!*slash)
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break;
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next_component = slash + 1;
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while (is_dir_sep(*next_component))
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next_component++;
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if (!*next_component)
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break;
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slash_character = *slash;
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*slash = '\0';
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if (!stat(path, &st)) {
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/* path exists */
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if (!S_ISDIR(st.st_mode)) {
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errno = ENOTDIR;
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ret = SCLD_EXISTS;
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}
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} else if (mkdir(path, 0777)) {
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if (errno == EEXIST &&
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!stat(path, &st) && S_ISDIR(st.st_mode))
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; /* somebody created it since we checked */
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else if (errno == ENOENT)
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/*
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* Either mkdir() failed because
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* somebody just pruned the containing
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* directory, or stat() failed because
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* the file that was in our way was
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* just removed. Either way, inform
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* the caller that it might be worth
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* trying again:
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*/
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ret = SCLD_VANISHED;
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else
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ret = SCLD_FAILED;
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} else if (adjust_shared_perm(path)) {
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ret = SCLD_PERMS;
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}
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*slash = slash_character;
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}
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return ret;
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}
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enum scld_error safe_create_leading_directories_const(const char *path)
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{
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int save_errno;
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/* path points to cache entries, so xstrdup before messing with it */
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char *buf = xstrdup(path);
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enum scld_error result = safe_create_leading_directories(buf);
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save_errno = errno;
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free(buf);
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errno = save_errno;
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return result;
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}
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int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
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{
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/*
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* The number of times we will try to remove empty directories
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* in the way of path. This is only 1 because if another
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* process is racily creating directories that conflict with
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* us, we don't want to fight against them.
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*/
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int remove_directories_remaining = 1;
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/*
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* The number of times that we will try to create the
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* directories containing path. We are willing to attempt this
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* more than once, because another process could be trying to
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* clean up empty directories at the same time as we are
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* trying to create them.
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*/
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int create_directories_remaining = 3;
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/* A scratch copy of path, filled lazily if we need it: */
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struct strbuf path_copy = STRBUF_INIT;
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int ret, save_errno;
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/* Sanity check: */
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assert(*path);
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retry_fn:
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ret = fn(path, cb);
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save_errno = errno;
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if (!ret)
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goto out;
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if (errno == EISDIR && remove_directories_remaining-- > 0) {
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/*
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* A directory is in the way. Maybe it is empty; try
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* to remove it:
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*/
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if (!path_copy.len)
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strbuf_addstr(&path_copy, path);
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if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
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goto retry_fn;
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} else if (errno == ENOENT && create_directories_remaining-- > 0) {
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/*
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* Maybe the containing directory didn't exist, or
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* maybe it was just deleted by a process that is
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* racing with us to clean up empty directories. Try
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* to create it:
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*/
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enum scld_error scld_result;
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if (!path_copy.len)
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strbuf_addstr(&path_copy, path);
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do {
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scld_result = safe_create_leading_directories(path_copy.buf);
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if (scld_result == SCLD_OK)
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goto retry_fn;
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} while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
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}
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out:
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strbuf_release(&path_copy);
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errno = save_errno;
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return ret;
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}
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static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
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{
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int i;
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for (i = 0; i < 20; i++) {
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static char hex[] = "0123456789abcdef";
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unsigned int val = sha1[i];
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strbuf_addch(buf, hex[val >> 4]);
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strbuf_addch(buf, hex[val & 0xf]);
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if (!i)
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strbuf_addch(buf, '/');
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}
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}
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const char *sha1_file_name(const unsigned char *sha1)
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{
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static struct strbuf buf = STRBUF_INIT;
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strbuf_reset(&buf);
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strbuf_addf(&buf, "%s/", get_object_directory());
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fill_sha1_path(&buf, sha1);
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return buf.buf;
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}
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struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
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{
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strbuf_setlen(&alt->scratch, alt->base_len);
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return &alt->scratch;
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}
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static const char *alt_sha1_path(struct alternate_object_database *alt,
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const unsigned char *sha1)
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{
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struct strbuf *buf = alt_scratch_buf(alt);
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fill_sha1_path(buf, sha1);
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return buf->buf;
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}
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char *odb_pack_name(struct strbuf *buf,
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const unsigned char *sha1,
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const char *ext)
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{
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strbuf_reset(buf);
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strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
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sha1_to_hex(sha1), ext);
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return buf->buf;
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}
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char *sha1_pack_name(const unsigned char *sha1)
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{
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static struct strbuf buf = STRBUF_INIT;
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return odb_pack_name(&buf, sha1, "pack");
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}
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char *sha1_pack_index_name(const unsigned char *sha1)
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{
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static struct strbuf buf = STRBUF_INIT;
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return odb_pack_name(&buf, sha1, "idx");
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}
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struct alternate_object_database *alt_odb_list;
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static struct alternate_object_database **alt_odb_tail;
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/*
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* Return non-zero iff the path is usable as an alternate object database.
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*/
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static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir)
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{
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struct alternate_object_database *alt;
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/* Detect cases where alternate disappeared */
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if (!is_directory(path->buf)) {
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error("object directory %s does not exist; "
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"check .git/objects/info/alternates.",
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path->buf);
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return 0;
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}
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/*
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* Prevent the common mistake of listing the same
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* thing twice, or object directory itself.
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*/
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for (alt = alt_odb_list; alt; alt = alt->next) {
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if (!fspathcmp(path->buf, alt->path))
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return 0;
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}
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if (!fspathcmp(path->buf, normalized_objdir))
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return 0;
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return 1;
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}
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/*
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* Prepare alternate object database registry.
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*
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* The variable alt_odb_list points at the list of struct
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* alternate_object_database. The elements on this list come from
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* non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
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* environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
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* whose contents is similar to that environment variable but can be
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* LF separated. Its base points at a statically allocated buffer that
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* contains "/the/directory/corresponding/to/.git/objects/...", while
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* its name points just after the slash at the end of ".git/objects/"
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* in the example above, and has enough space to hold 40-byte hex
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* SHA1, an extra slash for the first level indirection, and the
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* terminating NUL.
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*/
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static int link_alt_odb_entry(const char *entry, const char *relative_base,
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int depth, const char *normalized_objdir)
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{
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struct alternate_object_database *ent;
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struct strbuf pathbuf = STRBUF_INIT;
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if (!is_absolute_path(entry) && relative_base) {
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strbuf_realpath(&pathbuf, relative_base, 1);
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strbuf_addch(&pathbuf, '/');
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}
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strbuf_addstr(&pathbuf, entry);
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if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
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error("unable to normalize alternate object path: %s",
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pathbuf.buf);
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strbuf_release(&pathbuf);
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return -1;
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}
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/*
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* The trailing slash after the directory name is given by
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* this function at the end. Remove duplicates.
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*/
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while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
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strbuf_setlen(&pathbuf, pathbuf.len - 1);
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if (!alt_odb_usable(&pathbuf, normalized_objdir)) {
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strbuf_release(&pathbuf);
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return -1;
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}
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ent = alloc_alt_odb(pathbuf.buf);
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/* add the alternate entry */
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*alt_odb_tail = ent;
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alt_odb_tail = &(ent->next);
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ent->next = NULL;
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/* recursively add alternates */
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read_info_alternates(pathbuf.buf, depth + 1);
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strbuf_release(&pathbuf);
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return 0;
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}
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static const char *parse_alt_odb_entry(const char *string,
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int sep,
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struct strbuf *out)
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{
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const char *end;
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strbuf_reset(out);
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if (*string == '#') {
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/* comment; consume up to next separator */
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end = strchrnul(string, sep);
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} else if (*string == '"' && !unquote_c_style(out, string, &end)) {
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/*
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* quoted path; unquote_c_style has copied the
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* data for us and set "end". Broken quoting (e.g.,
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* an entry that doesn't end with a quote) falls
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* back to the unquoted case below.
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*/
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} else {
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/* normal, unquoted path */
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end = strchrnul(string, sep);
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strbuf_add(out, string, end - string);
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}
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if (*end)
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end++;
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return end;
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}
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static void link_alt_odb_entries(const char *alt, int len, int sep,
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const char *relative_base, int depth)
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{
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struct strbuf objdirbuf = STRBUF_INIT;
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struct strbuf entry = STRBUF_INIT;
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if (depth > 5) {
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error("%s: ignoring alternate object stores, nesting too deep.",
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relative_base);
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return;
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}
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strbuf_add_absolute_path(&objdirbuf, get_object_directory());
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if (strbuf_normalize_path(&objdirbuf) < 0)
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die("unable to normalize object directory: %s",
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objdirbuf.buf);
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while (*alt) {
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alt = parse_alt_odb_entry(alt, sep, &entry);
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if (!entry.len)
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continue;
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link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf);
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}
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strbuf_release(&entry);
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strbuf_release(&objdirbuf);
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}
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|
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void read_info_alternates(const char * relative_base, int depth)
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{
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char *map;
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size_t mapsz;
|
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struct stat st;
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char *path;
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int fd;
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path = xstrfmt("%s/info/alternates", relative_base);
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fd = git_open(path);
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free(path);
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if (fd < 0)
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return;
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if (fstat(fd, &st) || (st.st_size == 0)) {
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close(fd);
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return;
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}
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mapsz = xsize_t(st.st_size);
|
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map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0);
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close(fd);
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|
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link_alt_odb_entries(map, mapsz, '\n', relative_base, depth);
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|
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munmap(map, mapsz);
|
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}
|
|
|
|
struct alternate_object_database *alloc_alt_odb(const char *dir)
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{
|
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struct alternate_object_database *ent;
|
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|
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FLEX_ALLOC_STR(ent, path, dir);
|
|
strbuf_init(&ent->scratch, 0);
|
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strbuf_addf(&ent->scratch, "%s/", dir);
|
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ent->base_len = ent->scratch.len;
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|
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return ent;
|
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}
|
|
|
|
void add_to_alternates_file(const char *reference)
|
|
{
|
|
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
|
|
char *alts = git_pathdup("objects/info/alternates");
|
|
FILE *in, *out;
|
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|
|
hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR);
|
|
out = fdopen_lock_file(lock, "w");
|
|
if (!out)
|
|
die_errno("unable to fdopen alternates lockfile");
|
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|
|
in = fopen(alts, "r");
|
|
if (in) {
|
|
struct strbuf line = STRBUF_INIT;
|
|
int found = 0;
|
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|
|
while (strbuf_getline(&line, in) != EOF) {
|
|
if (!strcmp(reference, line.buf)) {
|
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found = 1;
|
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break;
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}
|
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fprintf_or_die(out, "%s\n", line.buf);
|
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}
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|
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strbuf_release(&line);
|
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fclose(in);
|
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|
|
if (found) {
|
|
rollback_lock_file(lock);
|
|
lock = NULL;
|
|
}
|
|
}
|
|
else if (errno != ENOENT)
|
|
die_errno("unable to read alternates file");
|
|
|
|
if (lock) {
|
|
fprintf_or_die(out, "%s\n", reference);
|
|
if (commit_lock_file(lock))
|
|
die_errno("unable to move new alternates file into place");
|
|
if (alt_odb_tail)
|
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link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0);
|
|
}
|
|
free(alts);
|
|
}
|
|
|
|
void add_to_alternates_memory(const char *reference)
|
|
{
|
|
/*
|
|
* Make sure alternates are initialized, or else our entry may be
|
|
* overwritten when they are.
|
|
*/
|
|
prepare_alt_odb();
|
|
|
|
link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* Compute the exact path an alternate is at and returns it. In case of
|
|
* error NULL is returned and the human readable error is added to `err`
|
|
* `path` may be relative and should point to $GITDIR.
|
|
* `err` must not be null.
|
|
*/
|
|
char *compute_alternate_path(const char *path, struct strbuf *err)
|
|
{
|
|
char *ref_git = NULL;
|
|
const char *repo, *ref_git_s;
|
|
int seen_error = 0;
|
|
|
|
ref_git_s = real_path_if_valid(path);
|
|
if (!ref_git_s) {
|
|
seen_error = 1;
|
|
strbuf_addf(err, _("path '%s' does not exist"), path);
|
|
goto out;
|
|
} else
|
|
/*
|
|
* Beware: read_gitfile(), real_path() and mkpath()
|
|
* return static buffer
|
|
*/
|
|
ref_git = xstrdup(ref_git_s);
|
|
|
|
repo = read_gitfile(ref_git);
|
|
if (!repo)
|
|
repo = read_gitfile(mkpath("%s/.git", ref_git));
|
|
if (repo) {
|
|
free(ref_git);
|
|
ref_git = xstrdup(repo);
|
|
}
|
|
|
|
if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
|
|
char *ref_git_git = mkpathdup("%s/.git", ref_git);
|
|
free(ref_git);
|
|
ref_git = ref_git_git;
|
|
} else if (!is_directory(mkpath("%s/objects", ref_git))) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
seen_error = 1;
|
|
if (get_common_dir(&sb, ref_git)) {
|
|
strbuf_addf(err,
|
|
_("reference repository '%s' as a linked "
|
|
"checkout is not supported yet."),
|
|
path);
|
|
goto out;
|
|
}
|
|
|
|
strbuf_addf(err, _("reference repository '%s' is not a "
|
|
"local repository."), path);
|
|
goto out;
|
|
}
|
|
|
|
if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
|
|
strbuf_addf(err, _("reference repository '%s' is shallow"),
|
|
path);
|
|
seen_error = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
|
|
strbuf_addf(err,
|
|
_("reference repository '%s' is grafted"),
|
|
path);
|
|
seen_error = 1;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (seen_error) {
|
|
free(ref_git);
|
|
ref_git = NULL;
|
|
}
|
|
|
|
return ref_git;
|
|
}
|
|
|
|
int foreach_alt_odb(alt_odb_fn fn, void *cb)
|
|
{
|
|
struct alternate_object_database *ent;
|
|
int r = 0;
|
|
|
|
prepare_alt_odb();
|
|
for (ent = alt_odb_list; ent; ent = ent->next) {
|
|
r = fn(ent, cb);
|
|
if (r)
|
|
break;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
void prepare_alt_odb(void)
|
|
{
|
|
const char *alt;
|
|
|
|
if (alt_odb_tail)
|
|
return;
|
|
|
|
alt = getenv(ALTERNATE_DB_ENVIRONMENT);
|
|
if (!alt) alt = "";
|
|
|
|
alt_odb_tail = &alt_odb_list;
|
|
link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0);
|
|
|
|
read_info_alternates(get_object_directory(), 0);
|
|
}
|
|
|
|
/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
|
|
static int freshen_file(const char *fn)
|
|
{
|
|
struct utimbuf t;
|
|
t.actime = t.modtime = time(NULL);
|
|
return !utime(fn, &t);
|
|
}
|
|
|
|
/*
|
|
* All of the check_and_freshen functions return 1 if the file exists and was
|
|
* freshened (if freshening was requested), 0 otherwise. If they return
|
|
* 0, you should not assume that it is safe to skip a write of the object (it
|
|
* either does not exist on disk, or has a stale mtime and may be subject to
|
|
* pruning).
|
|
*/
|
|
int check_and_freshen_file(const char *fn, int freshen)
|
|
{
|
|
if (access(fn, F_OK))
|
|
return 0;
|
|
if (freshen && !freshen_file(fn))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int check_and_freshen_local(const unsigned char *sha1, int freshen)
|
|
{
|
|
return check_and_freshen_file(sha1_file_name(sha1), freshen);
|
|
}
|
|
|
|
static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
|
|
{
|
|
struct alternate_object_database *alt;
|
|
prepare_alt_odb();
|
|
for (alt = alt_odb_list; alt; alt = alt->next) {
|
|
const char *path = alt_sha1_path(alt, sha1);
|
|
if (check_and_freshen_file(path, freshen))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_and_freshen(const unsigned char *sha1, int freshen)
|
|
{
|
|
return check_and_freshen_local(sha1, freshen) ||
|
|
check_and_freshen_nonlocal(sha1, freshen);
|
|
}
|
|
|
|
int has_loose_object_nonlocal(const unsigned char *sha1)
|
|
{
|
|
return check_and_freshen_nonlocal(sha1, 0);
|
|
}
|
|
|
|
static int has_loose_object(const unsigned char *sha1)
|
|
{
|
|
return check_and_freshen(sha1, 0);
|
|
}
|
|
|
|
static unsigned int pack_used_ctr;
|
|
static unsigned int pack_mmap_calls;
|
|
static unsigned int peak_pack_open_windows;
|
|
static unsigned int pack_open_windows;
|
|
static unsigned int pack_open_fds;
|
|
static unsigned int pack_max_fds;
|
|
static size_t peak_pack_mapped;
|
|
static size_t pack_mapped;
|
|
struct packed_git *packed_git;
|
|
|
|
static struct mru packed_git_mru_storage;
|
|
struct mru *packed_git_mru = &packed_git_mru_storage;
|
|
|
|
void pack_report(void)
|
|
{
|
|
fprintf(stderr,
|
|
"pack_report: getpagesize() = %10" SZ_FMT "\n"
|
|
"pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
|
|
"pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
|
|
sz_fmt(getpagesize()),
|
|
sz_fmt(packed_git_window_size),
|
|
sz_fmt(packed_git_limit));
|
|
fprintf(stderr,
|
|
"pack_report: pack_used_ctr = %10u\n"
|
|
"pack_report: pack_mmap_calls = %10u\n"
|
|
"pack_report: pack_open_windows = %10u / %10u\n"
|
|
"pack_report: pack_mapped = "
|
|
"%10" SZ_FMT " / %10" SZ_FMT "\n",
|
|
pack_used_ctr,
|
|
pack_mmap_calls,
|
|
pack_open_windows, peak_pack_open_windows,
|
|
sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
|
|
}
|
|
|
|
/*
|
|
* Open and mmap the index file at path, perform a couple of
|
|
* consistency checks, then record its information to p. Return 0 on
|
|
* success.
|
|
*/
|
|
static int check_packed_git_idx(const char *path, struct packed_git *p)
|
|
{
|
|
void *idx_map;
|
|
struct pack_idx_header *hdr;
|
|
size_t idx_size;
|
|
uint32_t version, nr, i, *index;
|
|
int fd = git_open(path);
|
|
struct stat st;
|
|
|
|
if (fd < 0)
|
|
return -1;
|
|
if (fstat(fd, &st)) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
idx_size = xsize_t(st.st_size);
|
|
if (idx_size < 4 * 256 + 20 + 20) {
|
|
close(fd);
|
|
return error("index file %s is too small", path);
|
|
}
|
|
idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
close(fd);
|
|
|
|
hdr = idx_map;
|
|
if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
|
|
version = ntohl(hdr->idx_version);
|
|
if (version < 2 || version > 2) {
|
|
munmap(idx_map, idx_size);
|
|
return error("index file %s is version %"PRIu32
|
|
" and is not supported by this binary"
|
|
" (try upgrading GIT to a newer version)",
|
|
path, version);
|
|
}
|
|
} else
|
|
version = 1;
|
|
|
|
nr = 0;
|
|
index = idx_map;
|
|
if (version > 1)
|
|
index += 2; /* skip index header */
|
|
for (i = 0; i < 256; i++) {
|
|
uint32_t n = ntohl(index[i]);
|
|
if (n < nr) {
|
|
munmap(idx_map, idx_size);
|
|
return error("non-monotonic index %s", path);
|
|
}
|
|
nr = n;
|
|
}
|
|
|
|
if (version == 1) {
|
|
/*
|
|
* Total size:
|
|
* - 256 index entries 4 bytes each
|
|
* - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
|
|
* - 20-byte SHA1 of the packfile
|
|
* - 20-byte SHA1 file checksum
|
|
*/
|
|
if (idx_size != 4*256 + nr * 24 + 20 + 20) {
|
|
munmap(idx_map, idx_size);
|
|
return error("wrong index v1 file size in %s", path);
|
|
}
|
|
} else if (version == 2) {
|
|
/*
|
|
* Minimum size:
|
|
* - 8 bytes of header
|
|
* - 256 index entries 4 bytes each
|
|
* - 20-byte sha1 entry * nr
|
|
* - 4-byte crc entry * nr
|
|
* - 4-byte offset entry * nr
|
|
* - 20-byte SHA1 of the packfile
|
|
* - 20-byte SHA1 file checksum
|
|
* And after the 4-byte offset table might be a
|
|
* variable sized table containing 8-byte entries
|
|
* for offsets larger than 2^31.
|
|
*/
|
|
unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
|
|
unsigned long max_size = min_size;
|
|
if (nr)
|
|
max_size += (nr - 1)*8;
|
|
if (idx_size < min_size || idx_size > max_size) {
|
|
munmap(idx_map, idx_size);
|
|
return error("wrong index v2 file size in %s", path);
|
|
}
|
|
if (idx_size != min_size &&
|
|
/*
|
|
* make sure we can deal with large pack offsets.
|
|
* 31-bit signed offset won't be enough, neither
|
|
* 32-bit unsigned one will be.
|
|
*/
|
|
(sizeof(off_t) <= 4)) {
|
|
munmap(idx_map, idx_size);
|
|
return error("pack too large for current definition of off_t in %s", path);
|
|
}
|
|
}
|
|
|
|
p->index_version = version;
|
|
p->index_data = idx_map;
|
|
p->index_size = idx_size;
|
|
p->num_objects = nr;
|
|
return 0;
|
|
}
|
|
|
|
int open_pack_index(struct packed_git *p)
|
|
{
|
|
char *idx_name;
|
|
size_t len;
|
|
int ret;
|
|
|
|
if (p->index_data)
|
|
return 0;
|
|
|
|
if (!strip_suffix(p->pack_name, ".pack", &len))
|
|
die("BUG: pack_name does not end in .pack");
|
|
idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
|
|
ret = check_packed_git_idx(idx_name, p);
|
|
free(idx_name);
|
|
return ret;
|
|
}
|
|
|
|
static void scan_windows(struct packed_git *p,
|
|
struct packed_git **lru_p,
|
|
struct pack_window **lru_w,
|
|
struct pack_window **lru_l)
|
|
{
|
|
struct pack_window *w, *w_l;
|
|
|
|
for (w_l = NULL, w = p->windows; w; w = w->next) {
|
|
if (!w->inuse_cnt) {
|
|
if (!*lru_w || w->last_used < (*lru_w)->last_used) {
|
|
*lru_p = p;
|
|
*lru_w = w;
|
|
*lru_l = w_l;
|
|
}
|
|
}
|
|
w_l = w;
|
|
}
|
|
}
|
|
|
|
static int unuse_one_window(struct packed_git *current)
|
|
{
|
|
struct packed_git *p, *lru_p = NULL;
|
|
struct pack_window *lru_w = NULL, *lru_l = NULL;
|
|
|
|
if (current)
|
|
scan_windows(current, &lru_p, &lru_w, &lru_l);
|
|
for (p = packed_git; p; p = p->next)
|
|
scan_windows(p, &lru_p, &lru_w, &lru_l);
|
|
if (lru_p) {
|
|
munmap(lru_w->base, lru_w->len);
|
|
pack_mapped -= lru_w->len;
|
|
if (lru_l)
|
|
lru_l->next = lru_w->next;
|
|
else
|
|
lru_p->windows = lru_w->next;
|
|
free(lru_w);
|
|
pack_open_windows--;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void release_pack_memory(size_t need)
|
|
{
|
|
size_t cur = pack_mapped;
|
|
while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
|
|
; /* nothing */
|
|
}
|
|
|
|
static void mmap_limit_check(size_t length)
|
|
{
|
|
static size_t limit = 0;
|
|
if (!limit) {
|
|
limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
|
|
if (!limit)
|
|
limit = SIZE_MAX;
|
|
}
|
|
if (length > limit)
|
|
die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX,
|
|
(uintmax_t)length, (uintmax_t)limit);
|
|
}
|
|
|
|
void *xmmap_gently(void *start, size_t length,
|
|
int prot, int flags, int fd, off_t offset)
|
|
{
|
|
void *ret;
|
|
|
|
mmap_limit_check(length);
|
|
ret = mmap(start, length, prot, flags, fd, offset);
|
|
if (ret == MAP_FAILED) {
|
|
if (!length)
|
|
return NULL;
|
|
release_pack_memory(length);
|
|
ret = mmap(start, length, prot, flags, fd, offset);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void *xmmap(void *start, size_t length,
|
|
int prot, int flags, int fd, off_t offset)
|
|
{
|
|
void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
|
|
if (ret == MAP_FAILED)
|
|
die_errno("mmap failed");
|
|
return ret;
|
|
}
|
|
|
|
void close_pack_windows(struct packed_git *p)
|
|
{
|
|
while (p->windows) {
|
|
struct pack_window *w = p->windows;
|
|
|
|
if (w->inuse_cnt)
|
|
die("pack '%s' still has open windows to it",
|
|
p->pack_name);
|
|
munmap(w->base, w->len);
|
|
pack_mapped -= w->len;
|
|
pack_open_windows--;
|
|
p->windows = w->next;
|
|
free(w);
|
|
}
|
|
}
|
|
|
|
static int close_pack_fd(struct packed_git *p)
|
|
{
|
|
if (p->pack_fd < 0)
|
|
return 0;
|
|
|
|
close(p->pack_fd);
|
|
pack_open_fds--;
|
|
p->pack_fd = -1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void close_pack(struct packed_git *p)
|
|
{
|
|
close_pack_windows(p);
|
|
close_pack_fd(p);
|
|
close_pack_index(p);
|
|
}
|
|
|
|
void close_all_packs(void)
|
|
{
|
|
struct packed_git *p;
|
|
|
|
for (p = packed_git; p; p = p->next)
|
|
if (p->do_not_close)
|
|
die("BUG: want to close pack marked 'do-not-close'");
|
|
else
|
|
close_pack(p);
|
|
}
|
|
|
|
|
|
/*
|
|
* The LRU pack is the one with the oldest MRU window, preferring packs
|
|
* with no used windows, or the oldest mtime if it has no windows allocated.
|
|
*/
|
|
static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
|
|
{
|
|
struct pack_window *w, *this_mru_w;
|
|
int has_windows_inuse = 0;
|
|
|
|
/*
|
|
* Reject this pack if it has windows and the previously selected
|
|
* one does not. If this pack does not have windows, reject
|
|
* it if the pack file is newer than the previously selected one.
|
|
*/
|
|
if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
|
|
return;
|
|
|
|
for (w = this_mru_w = p->windows; w; w = w->next) {
|
|
/*
|
|
* Reject this pack if any of its windows are in use,
|
|
* but the previously selected pack did not have any
|
|
* inuse windows. Otherwise, record that this pack
|
|
* has windows in use.
|
|
*/
|
|
if (w->inuse_cnt) {
|
|
if (*accept_windows_inuse)
|
|
has_windows_inuse = 1;
|
|
else
|
|
return;
|
|
}
|
|
|
|
if (w->last_used > this_mru_w->last_used)
|
|
this_mru_w = w;
|
|
|
|
/*
|
|
* Reject this pack if it has windows that have been
|
|
* used more recently than the previously selected pack.
|
|
* If the previously selected pack had windows inuse and
|
|
* we have not encountered a window in this pack that is
|
|
* inuse, skip this check since we prefer a pack with no
|
|
* inuse windows to one that has inuse windows.
|
|
*/
|
|
if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
|
|
this_mru_w->last_used > (*mru_w)->last_used)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Select this pack.
|
|
*/
|
|
*mru_w = this_mru_w;
|
|
*lru_p = p;
|
|
*accept_windows_inuse = has_windows_inuse;
|
|
}
|
|
|
|
static int close_one_pack(void)
|
|
{
|
|
struct packed_git *p, *lru_p = NULL;
|
|
struct pack_window *mru_w = NULL;
|
|
int accept_windows_inuse = 1;
|
|
|
|
for (p = packed_git; p; p = p->next) {
|
|
if (p->pack_fd == -1)
|
|
continue;
|
|
find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
|
|
}
|
|
|
|
if (lru_p)
|
|
return close_pack_fd(lru_p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void unuse_pack(struct pack_window **w_cursor)
|
|
{
|
|
struct pack_window *w = *w_cursor;
|
|
if (w) {
|
|
w->inuse_cnt--;
|
|
*w_cursor = NULL;
|
|
}
|
|
}
|
|
|
|
void close_pack_index(struct packed_git *p)
|
|
{
|
|
if (p->index_data) {
|
|
munmap((void *)p->index_data, p->index_size);
|
|
p->index_data = NULL;
|
|
}
|
|
}
|
|
|
|
static unsigned int get_max_fd_limit(void)
|
|
{
|
|
#ifdef RLIMIT_NOFILE
|
|
{
|
|
struct rlimit lim;
|
|
|
|
if (!getrlimit(RLIMIT_NOFILE, &lim))
|
|
return lim.rlim_cur;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _SC_OPEN_MAX
|
|
{
|
|
long open_max = sysconf(_SC_OPEN_MAX);
|
|
if (0 < open_max)
|
|
return open_max;
|
|
/*
|
|
* Otherwise, we got -1 for one of the two
|
|
* reasons:
|
|
*
|
|
* (1) sysconf() did not understand _SC_OPEN_MAX
|
|
* and signaled an error with -1; or
|
|
* (2) sysconf() said there is no limit.
|
|
*
|
|
* We _could_ clear errno before calling sysconf() to
|
|
* tell these two cases apart and return a huge number
|
|
* in the latter case to let the caller cap it to a
|
|
* value that is not so selfish, but letting the
|
|
* fallback OPEN_MAX codepath take care of these cases
|
|
* is a lot simpler.
|
|
*/
|
|
}
|
|
#endif
|
|
|
|
#ifdef OPEN_MAX
|
|
return OPEN_MAX;
|
|
#else
|
|
return 1; /* see the caller ;-) */
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Do not call this directly as this leaks p->pack_fd on error return;
|
|
* call open_packed_git() instead.
|
|
*/
|
|
static int open_packed_git_1(struct packed_git *p)
|
|
{
|
|
struct stat st;
|
|
struct pack_header hdr;
|
|
unsigned char sha1[20];
|
|
unsigned char *idx_sha1;
|
|
long fd_flag;
|
|
|
|
if (!p->index_data && open_pack_index(p))
|
|
return error("packfile %s index unavailable", p->pack_name);
|
|
|
|
if (!pack_max_fds) {
|
|
unsigned int max_fds = get_max_fd_limit();
|
|
|
|
/* Save 3 for stdin/stdout/stderr, 22 for work */
|
|
if (25 < max_fds)
|
|
pack_max_fds = max_fds - 25;
|
|
else
|
|
pack_max_fds = 1;
|
|
}
|
|
|
|
while (pack_max_fds <= pack_open_fds && close_one_pack())
|
|
; /* nothing */
|
|
|
|
p->pack_fd = git_open(p->pack_name);
|
|
if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
|
|
return -1;
|
|
pack_open_fds++;
|
|
|
|
/* If we created the struct before we had the pack we lack size. */
|
|
if (!p->pack_size) {
|
|
if (!S_ISREG(st.st_mode))
|
|
return error("packfile %s not a regular file", p->pack_name);
|
|
p->pack_size = st.st_size;
|
|
} else if (p->pack_size != st.st_size)
|
|
return error("packfile %s size changed", p->pack_name);
|
|
|
|
/* We leave these file descriptors open with sliding mmap;
|
|
* there is no point keeping them open across exec(), though.
|
|
*/
|
|
fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
|
|
if (fd_flag < 0)
|
|
return error("cannot determine file descriptor flags");
|
|
fd_flag |= FD_CLOEXEC;
|
|
if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
|
|
return error("cannot set FD_CLOEXEC");
|
|
|
|
/* Verify we recognize this pack file format. */
|
|
if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
|
|
return error("file %s is far too short to be a packfile", p->pack_name);
|
|
if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
|
|
return error("file %s is not a GIT packfile", p->pack_name);
|
|
if (!pack_version_ok(hdr.hdr_version))
|
|
return error("packfile %s is version %"PRIu32" and not"
|
|
" supported (try upgrading GIT to a newer version)",
|
|
p->pack_name, ntohl(hdr.hdr_version));
|
|
|
|
/* Verify the pack matches its index. */
|
|
if (p->num_objects != ntohl(hdr.hdr_entries))
|
|
return error("packfile %s claims to have %"PRIu32" objects"
|
|
" while index indicates %"PRIu32" objects",
|
|
p->pack_name, ntohl(hdr.hdr_entries),
|
|
p->num_objects);
|
|
if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
|
|
return error("end of packfile %s is unavailable", p->pack_name);
|
|
if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
|
|
return error("packfile %s signature is unavailable", p->pack_name);
|
|
idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
|
|
if (hashcmp(sha1, idx_sha1))
|
|
return error("packfile %s does not match index", p->pack_name);
|
|
return 0;
|
|
}
|
|
|
|
static int open_packed_git(struct packed_git *p)
|
|
{
|
|
if (!open_packed_git_1(p))
|
|
return 0;
|
|
close_pack_fd(p);
|
|
return -1;
|
|
}
|
|
|
|
static int in_window(struct pack_window *win, off_t offset)
|
|
{
|
|
/* We must promise at least 20 bytes (one hash) after the
|
|
* offset is available from this window, otherwise the offset
|
|
* is not actually in this window and a different window (which
|
|
* has that one hash excess) must be used. This is to support
|
|
* the object header and delta base parsing routines below.
|
|
*/
|
|
off_t win_off = win->offset;
|
|
return win_off <= offset
|
|
&& (offset + 20) <= (win_off + win->len);
|
|
}
|
|
|
|
unsigned char *use_pack(struct packed_git *p,
|
|
struct pack_window **w_cursor,
|
|
off_t offset,
|
|
unsigned long *left)
|
|
{
|
|
struct pack_window *win = *w_cursor;
|
|
|
|
/* Since packfiles end in a hash of their content and it's
|
|
* pointless to ask for an offset into the middle of that
|
|
* hash, and the in_window function above wouldn't match
|
|
* don't allow an offset too close to the end of the file.
|
|
*/
|
|
if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
|
|
die("packfile %s cannot be accessed", p->pack_name);
|
|
if (offset > (p->pack_size - 20))
|
|
die("offset beyond end of packfile (truncated pack?)");
|
|
if (offset < 0)
|
|
die(_("offset before end of packfile (broken .idx?)"));
|
|
|
|
if (!win || !in_window(win, offset)) {
|
|
if (win)
|
|
win->inuse_cnt--;
|
|
for (win = p->windows; win; win = win->next) {
|
|
if (in_window(win, offset))
|
|
break;
|
|
}
|
|
if (!win) {
|
|
size_t window_align = packed_git_window_size / 2;
|
|
off_t len;
|
|
|
|
if (p->pack_fd == -1 && open_packed_git(p))
|
|
die("packfile %s cannot be accessed", p->pack_name);
|
|
|
|
win = xcalloc(1, sizeof(*win));
|
|
win->offset = (offset / window_align) * window_align;
|
|
len = p->pack_size - win->offset;
|
|
if (len > packed_git_window_size)
|
|
len = packed_git_window_size;
|
|
win->len = (size_t)len;
|
|
pack_mapped += win->len;
|
|
while (packed_git_limit < pack_mapped
|
|
&& unuse_one_window(p))
|
|
; /* nothing */
|
|
win->base = xmmap(NULL, win->len,
|
|
PROT_READ, MAP_PRIVATE,
|
|
p->pack_fd, win->offset);
|
|
if (win->base == MAP_FAILED)
|
|
die_errno("packfile %s cannot be mapped",
|
|
p->pack_name);
|
|
if (!win->offset && win->len == p->pack_size
|
|
&& !p->do_not_close)
|
|
close_pack_fd(p);
|
|
pack_mmap_calls++;
|
|
pack_open_windows++;
|
|
if (pack_mapped > peak_pack_mapped)
|
|
peak_pack_mapped = pack_mapped;
|
|
if (pack_open_windows > peak_pack_open_windows)
|
|
peak_pack_open_windows = pack_open_windows;
|
|
win->next = p->windows;
|
|
p->windows = win;
|
|
}
|
|
}
|
|
if (win != *w_cursor) {
|
|
win->last_used = pack_used_ctr++;
|
|
win->inuse_cnt++;
|
|
*w_cursor = win;
|
|
}
|
|
offset -= win->offset;
|
|
if (left)
|
|
*left = win->len - xsize_t(offset);
|
|
return win->base + offset;
|
|
}
|
|
|
|
static struct packed_git *alloc_packed_git(int extra)
|
|
{
|
|
struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
|
|
memset(p, 0, sizeof(*p));
|
|
p->pack_fd = -1;
|
|
return p;
|
|
}
|
|
|
|
static void try_to_free_pack_memory(size_t size)
|
|
{
|
|
release_pack_memory(size);
|
|
}
|
|
|
|
struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
|
|
{
|
|
static int have_set_try_to_free_routine;
|
|
struct stat st;
|
|
size_t alloc;
|
|
struct packed_git *p;
|
|
|
|
if (!have_set_try_to_free_routine) {
|
|
have_set_try_to_free_routine = 1;
|
|
set_try_to_free_routine(try_to_free_pack_memory);
|
|
}
|
|
|
|
/*
|
|
* Make sure a corresponding .pack file exists and that
|
|
* the index looks sane.
|
|
*/
|
|
if (!strip_suffix_mem(path, &path_len, ".idx"))
|
|
return NULL;
|
|
|
|
/*
|
|
* ".pack" is long enough to hold any suffix we're adding (and
|
|
* the use xsnprintf double-checks that)
|
|
*/
|
|
alloc = st_add3(path_len, strlen(".pack"), 1);
|
|
p = alloc_packed_git(alloc);
|
|
memcpy(p->pack_name, path, path_len);
|
|
|
|
xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
|
|
if (!access(p->pack_name, F_OK))
|
|
p->pack_keep = 1;
|
|
|
|
xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
|
|
if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
|
|
free(p);
|
|
return NULL;
|
|
}
|
|
|
|
/* ok, it looks sane as far as we can check without
|
|
* actually mapping the pack file.
|
|
*/
|
|
p->pack_size = st.st_size;
|
|
p->pack_local = local;
|
|
p->mtime = st.st_mtime;
|
|
if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
|
|
hashclr(p->sha1);
|
|
return p;
|
|
}
|
|
|
|
struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
|
|
{
|
|
const char *path = sha1_pack_name(sha1);
|
|
size_t alloc = st_add(strlen(path), 1);
|
|
struct packed_git *p = alloc_packed_git(alloc);
|
|
|
|
memcpy(p->pack_name, path, alloc); /* includes NUL */
|
|
hashcpy(p->sha1, sha1);
|
|
if (check_packed_git_idx(idx_path, p)) {
|
|
free(p);
|
|
return NULL;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
void install_packed_git(struct packed_git *pack)
|
|
{
|
|
if (pack->pack_fd != -1)
|
|
pack_open_fds++;
|
|
|
|
pack->next = packed_git;
|
|
packed_git = pack;
|
|
}
|
|
|
|
void (*report_garbage)(unsigned seen_bits, const char *path);
|
|
|
|
static void report_helper(const struct string_list *list,
|
|
int seen_bits, int first, int last)
|
|
{
|
|
if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
|
|
return;
|
|
|
|
for (; first < last; first++)
|
|
report_garbage(seen_bits, list->items[first].string);
|
|
}
|
|
|
|
static void report_pack_garbage(struct string_list *list)
|
|
{
|
|
int i, baselen = -1, first = 0, seen_bits = 0;
|
|
|
|
if (!report_garbage)
|
|
return;
|
|
|
|
string_list_sort(list);
|
|
|
|
for (i = 0; i < list->nr; i++) {
|
|
const char *path = list->items[i].string;
|
|
if (baselen != -1 &&
|
|
strncmp(path, list->items[first].string, baselen)) {
|
|
report_helper(list, seen_bits, first, i);
|
|
baselen = -1;
|
|
seen_bits = 0;
|
|
}
|
|
if (baselen == -1) {
|
|
const char *dot = strrchr(path, '.');
|
|
if (!dot) {
|
|
report_garbage(PACKDIR_FILE_GARBAGE, path);
|
|
continue;
|
|
}
|
|
baselen = dot - path + 1;
|
|
first = i;
|
|
}
|
|
if (!strcmp(path + baselen, "pack"))
|
|
seen_bits |= 1;
|
|
else if (!strcmp(path + baselen, "idx"))
|
|
seen_bits |= 2;
|
|
}
|
|
report_helper(list, seen_bits, first, list->nr);
|
|
}
|
|
|
|
static void prepare_packed_git_one(char *objdir, int local)
|
|
{
|
|
struct strbuf path = STRBUF_INIT;
|
|
size_t dirnamelen;
|
|
DIR *dir;
|
|
struct dirent *de;
|
|
struct string_list garbage = STRING_LIST_INIT_DUP;
|
|
|
|
strbuf_addstr(&path, objdir);
|
|
strbuf_addstr(&path, "/pack");
|
|
dir = opendir(path.buf);
|
|
if (!dir) {
|
|
if (errno != ENOENT)
|
|
error_errno("unable to open object pack directory: %s",
|
|
path.buf);
|
|
strbuf_release(&path);
|
|
return;
|
|
}
|
|
strbuf_addch(&path, '/');
|
|
dirnamelen = path.len;
|
|
while ((de = readdir(dir)) != NULL) {
|
|
struct packed_git *p;
|
|
size_t base_len;
|
|
|
|
if (is_dot_or_dotdot(de->d_name))
|
|
continue;
|
|
|
|
strbuf_setlen(&path, dirnamelen);
|
|
strbuf_addstr(&path, de->d_name);
|
|
|
|
base_len = path.len;
|
|
if (strip_suffix_mem(path.buf, &base_len, ".idx")) {
|
|
/* Don't reopen a pack we already have. */
|
|
for (p = packed_git; p; p = p->next) {
|
|
size_t len;
|
|
if (strip_suffix(p->pack_name, ".pack", &len) &&
|
|
len == base_len &&
|
|
!memcmp(p->pack_name, path.buf, len))
|
|
break;
|
|
}
|
|
if (p == NULL &&
|
|
/*
|
|
* See if it really is a valid .idx file with
|
|
* corresponding .pack file that we can map.
|
|
*/
|
|
(p = add_packed_git(path.buf, path.len, local)) != NULL)
|
|
install_packed_git(p);
|
|
}
|
|
|
|
if (!report_garbage)
|
|
continue;
|
|
|
|
if (ends_with(de->d_name, ".idx") ||
|
|
ends_with(de->d_name, ".pack") ||
|
|
ends_with(de->d_name, ".bitmap") ||
|
|
ends_with(de->d_name, ".keep"))
|
|
string_list_append(&garbage, path.buf);
|
|
else
|
|
report_garbage(PACKDIR_FILE_GARBAGE, path.buf);
|
|
}
|
|
closedir(dir);
|
|
report_pack_garbage(&garbage);
|
|
string_list_clear(&garbage, 0);
|
|
strbuf_release(&path);
|
|
}
|
|
|
|
static int approximate_object_count_valid;
|
|
|
|
/*
|
|
* Give a fast, rough count of the number of objects in the repository. This
|
|
* ignores loose objects completely. If you have a lot of them, then either
|
|
* you should repack because your performance will be awful, or they are
|
|
* all unreachable objects about to be pruned, in which case they're not really
|
|
* interesting as a measure of repo size in the first place.
|
|
*/
|
|
unsigned long approximate_object_count(void)
|
|
{
|
|
static unsigned long count;
|
|
if (!approximate_object_count_valid) {
|
|
struct packed_git *p;
|
|
|
|
prepare_packed_git();
|
|
count = 0;
|
|
for (p = packed_git; p; p = p->next) {
|
|
if (open_pack_index(p))
|
|
continue;
|
|
count += p->num_objects;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static void *get_next_packed_git(const void *p)
|
|
{
|
|
return ((const struct packed_git *)p)->next;
|
|
}
|
|
|
|
static void set_next_packed_git(void *p, void *next)
|
|
{
|
|
((struct packed_git *)p)->next = next;
|
|
}
|
|
|
|
static int sort_pack(const void *a_, const void *b_)
|
|
{
|
|
const struct packed_git *a = a_;
|
|
const struct packed_git *b = b_;
|
|
int st;
|
|
|
|
/*
|
|
* Local packs tend to contain objects specific to our
|
|
* variant of the project than remote ones. In addition,
|
|
* remote ones could be on a network mounted filesystem.
|
|
* Favor local ones for these reasons.
|
|
*/
|
|
st = a->pack_local - b->pack_local;
|
|
if (st)
|
|
return -st;
|
|
|
|
/*
|
|
* Younger packs tend to contain more recent objects,
|
|
* and more recent objects tend to get accessed more
|
|
* often.
|
|
*/
|
|
if (a->mtime < b->mtime)
|
|
return 1;
|
|
else if (a->mtime == b->mtime)
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
static void rearrange_packed_git(void)
|
|
{
|
|
packed_git = llist_mergesort(packed_git, get_next_packed_git,
|
|
set_next_packed_git, sort_pack);
|
|
}
|
|
|
|
static void prepare_packed_git_mru(void)
|
|
{
|
|
struct packed_git *p;
|
|
|
|
mru_clear(packed_git_mru);
|
|
for (p = packed_git; p; p = p->next)
|
|
mru_append(packed_git_mru, p);
|
|
}
|
|
|
|
static int prepare_packed_git_run_once = 0;
|
|
void prepare_packed_git(void)
|
|
{
|
|
struct alternate_object_database *alt;
|
|
|
|
if (prepare_packed_git_run_once)
|
|
return;
|
|
prepare_packed_git_one(get_object_directory(), 1);
|
|
prepare_alt_odb();
|
|
for (alt = alt_odb_list; alt; alt = alt->next)
|
|
prepare_packed_git_one(alt->path, 0);
|
|
rearrange_packed_git();
|
|
prepare_packed_git_mru();
|
|
prepare_packed_git_run_once = 1;
|
|
}
|
|
|
|
void reprepare_packed_git(void)
|
|
{
|
|
approximate_object_count_valid = 0;
|
|
prepare_packed_git_run_once = 0;
|
|
prepare_packed_git();
|
|
}
|
|
|
|
static void mark_bad_packed_object(struct packed_git *p,
|
|
const unsigned char *sha1)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i < p->num_bad_objects; i++)
|
|
if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
|
|
return;
|
|
p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
|
|
st_mult(GIT_SHA1_RAWSZ,
|
|
st_add(p->num_bad_objects, 1)));
|
|
hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
|
|
p->num_bad_objects++;
|
|
}
|
|
|
|
static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
|
|
{
|
|
struct packed_git *p;
|
|
unsigned i;
|
|
|
|
for (p = packed_git; p; p = p->next)
|
|
for (i = 0; i < p->num_bad_objects; i++)
|
|
if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
|
|
return p;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* With an in-core object data in "map", rehash it to make sure the
|
|
* object name actually matches "sha1" to detect object corruption.
|
|
* With "map" == NULL, try reading the object named with "sha1" using
|
|
* the streaming interface and rehash it to do the same.
|
|
*/
|
|
int check_sha1_signature(const unsigned char *sha1, void *map,
|
|
unsigned long size, const char *type)
|
|
{
|
|
unsigned char real_sha1[20];
|
|
enum object_type obj_type;
|
|
struct git_istream *st;
|
|
git_SHA_CTX c;
|
|
char hdr[32];
|
|
int hdrlen;
|
|
|
|
if (map) {
|
|
hash_sha1_file(map, size, type, real_sha1);
|
|
return hashcmp(sha1, real_sha1) ? -1 : 0;
|
|
}
|
|
|
|
st = open_istream(sha1, &obj_type, &size, NULL);
|
|
if (!st)
|
|
return -1;
|
|
|
|
/* Generate the header */
|
|
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
|
|
|
|
/* Sha1.. */
|
|
git_SHA1_Init(&c);
|
|
git_SHA1_Update(&c, hdr, hdrlen);
|
|
for (;;) {
|
|
char buf[1024 * 16];
|
|
ssize_t readlen = read_istream(st, buf, sizeof(buf));
|
|
|
|
if (readlen < 0) {
|
|
close_istream(st);
|
|
return -1;
|
|
}
|
|
if (!readlen)
|
|
break;
|
|
git_SHA1_Update(&c, buf, readlen);
|
|
}
|
|
git_SHA1_Final(real_sha1, &c);
|
|
close_istream(st);
|
|
return hashcmp(sha1, real_sha1) ? -1 : 0;
|
|
}
|
|
|
|
int git_open_cloexec(const char *name, int flags)
|
|
{
|
|
int fd;
|
|
static int o_cloexec = O_CLOEXEC;
|
|
|
|
fd = open(name, flags | o_cloexec);
|
|
if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
|
|
/* Try again w/o O_CLOEXEC: the kernel might not support it */
|
|
o_cloexec &= ~O_CLOEXEC;
|
|
fd = open(name, flags | o_cloexec);
|
|
}
|
|
|
|
#if defined(F_GETFL) && defined(F_SETFL) && defined(FD_CLOEXEC)
|
|
{
|
|
static int fd_cloexec = FD_CLOEXEC;
|
|
|
|
if (!o_cloexec && 0 <= fd && fd_cloexec) {
|
|
/* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
|
|
int flags = fcntl(fd, F_GETFL);
|
|
if (fcntl(fd, F_SETFL, flags | fd_cloexec))
|
|
fd_cloexec = 0;
|
|
}
|
|
}
|
|
#endif
|
|
return fd;
|
|
}
|
|
|
|
/*
|
|
* Find "sha1" as a loose object in the local repository or in an alternate.
|
|
* Returns 0 on success, negative on failure.
|
|
*
|
|
* The "path" out-parameter will give the path of the object we found (if any).
|
|
* Note that it may point to static storage and is only valid until another
|
|
* call to sha1_file_name(), etc.
|
|
*/
|
|
static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
|
|
const char **path)
|
|
{
|
|
struct alternate_object_database *alt;
|
|
|
|
*path = sha1_file_name(sha1);
|
|
if (!lstat(*path, st))
|
|
return 0;
|
|
|
|
prepare_alt_odb();
|
|
errno = ENOENT;
|
|
for (alt = alt_odb_list; alt; alt = alt->next) {
|
|
*path = alt_sha1_path(alt, sha1);
|
|
if (!lstat(*path, st))
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Like stat_sha1_file(), but actually open the object and return the
|
|
* descriptor. See the caveats on the "path" parameter above.
|
|
*/
|
|
static int open_sha1_file(const unsigned char *sha1, const char **path)
|
|
{
|
|
int fd;
|
|
struct alternate_object_database *alt;
|
|
int most_interesting_errno;
|
|
|
|
*path = sha1_file_name(sha1);
|
|
fd = git_open(*path);
|
|
if (fd >= 0)
|
|
return fd;
|
|
most_interesting_errno = errno;
|
|
|
|
prepare_alt_odb();
|
|
for (alt = alt_odb_list; alt; alt = alt->next) {
|
|
*path = alt_sha1_path(alt, sha1);
|
|
fd = git_open(*path);
|
|
if (fd >= 0)
|
|
return fd;
|
|
if (most_interesting_errno == ENOENT)
|
|
most_interesting_errno = errno;
|
|
}
|
|
errno = most_interesting_errno;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Map the loose object at "path" if it is not NULL, or the path found by
|
|
* searching for a loose object named "sha1".
|
|
*/
|
|
static void *map_sha1_file_1(const char *path,
|
|
const unsigned char *sha1,
|
|
unsigned long *size)
|
|
{
|
|
void *map;
|
|
int fd;
|
|
|
|
if (path)
|
|
fd = git_open(path);
|
|
else
|
|
fd = open_sha1_file(sha1, &path);
|
|
map = NULL;
|
|
if (fd >= 0) {
|
|
struct stat st;
|
|
|
|
if (!fstat(fd, &st)) {
|
|
*size = xsize_t(st.st_size);
|
|
if (!*size) {
|
|
/* mmap() is forbidden on empty files */
|
|
error("object file %s is empty", path);
|
|
return NULL;
|
|
}
|
|
map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
}
|
|
close(fd);
|
|
}
|
|
return map;
|
|
}
|
|
|
|
void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
|
|
{
|
|
return map_sha1_file_1(NULL, sha1, size);
|
|
}
|
|
|
|
unsigned long unpack_object_header_buffer(const unsigned char *buf,
|
|
unsigned long len, enum object_type *type, unsigned long *sizep)
|
|
{
|
|
unsigned shift;
|
|
unsigned long size, c;
|
|
unsigned long used = 0;
|
|
|
|
c = buf[used++];
|
|
*type = (c >> 4) & 7;
|
|
size = c & 15;
|
|
shift = 4;
|
|
while (c & 0x80) {
|
|
if (len <= used || bitsizeof(long) <= shift) {
|
|
error("bad object header");
|
|
size = used = 0;
|
|
break;
|
|
}
|
|
c = buf[used++];
|
|
size += (c & 0x7f) << shift;
|
|
shift += 7;
|
|
}
|
|
*sizep = size;
|
|
return used;
|
|
}
|
|
|
|
static int unpack_sha1_short_header(git_zstream *stream,
|
|
unsigned char *map, unsigned long mapsize,
|
|
void *buffer, unsigned long bufsiz)
|
|
{
|
|
/* Get the data stream */
|
|
memset(stream, 0, sizeof(*stream));
|
|
stream->next_in = map;
|
|
stream->avail_in = mapsize;
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
|
|
git_inflate_init(stream);
|
|
return git_inflate(stream, 0);
|
|
}
|
|
|
|
int unpack_sha1_header(git_zstream *stream,
|
|
unsigned char *map, unsigned long mapsize,
|
|
void *buffer, unsigned long bufsiz)
|
|
{
|
|
int status = unpack_sha1_short_header(stream, map, mapsize,
|
|
buffer, bufsiz);
|
|
|
|
if (status < Z_OK)
|
|
return status;
|
|
|
|
/* Make sure we have the terminating NUL */
|
|
if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map,
|
|
unsigned long mapsize, void *buffer,
|
|
unsigned long bufsiz, struct strbuf *header)
|
|
{
|
|
int status;
|
|
|
|
status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz);
|
|
if (status < Z_OK)
|
|
return -1;
|
|
|
|
/*
|
|
* Check if entire header is unpacked in the first iteration.
|
|
*/
|
|
if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
|
|
return 0;
|
|
|
|
/*
|
|
* buffer[0..bufsiz] was not large enough. Copy the partial
|
|
* result out to header, and then append the result of further
|
|
* reading the stream.
|
|
*/
|
|
strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
|
|
do {
|
|
status = git_inflate(stream, 0);
|
|
strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
|
|
if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
|
|
return 0;
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
} while (status != Z_STREAM_END);
|
|
return -1;
|
|
}
|
|
|
|
static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
|
|
{
|
|
int bytes = strlen(buffer) + 1;
|
|
unsigned char *buf = xmallocz(size);
|
|
unsigned long n;
|
|
int status = Z_OK;
|
|
|
|
n = stream->total_out - bytes;
|
|
if (n > size)
|
|
n = size;
|
|
memcpy(buf, (char *) buffer + bytes, n);
|
|
bytes = n;
|
|
if (bytes <= size) {
|
|
/*
|
|
* The above condition must be (bytes <= size), not
|
|
* (bytes < size). In other words, even though we
|
|
* expect no more output and set avail_out to zero,
|
|
* the input zlib stream may have bytes that express
|
|
* "this concludes the stream", and we *do* want to
|
|
* eat that input.
|
|
*
|
|
* Otherwise we would not be able to test that we
|
|
* consumed all the input to reach the expected size;
|
|
* we also want to check that zlib tells us that all
|
|
* went well with status == Z_STREAM_END at the end.
|
|
*/
|
|
stream->next_out = buf + bytes;
|
|
stream->avail_out = size - bytes;
|
|
while (status == Z_OK)
|
|
status = git_inflate(stream, Z_FINISH);
|
|
}
|
|
if (status == Z_STREAM_END && !stream->avail_in) {
|
|
git_inflate_end(stream);
|
|
return buf;
|
|
}
|
|
|
|
if (status < 0)
|
|
error("corrupt loose object '%s'", sha1_to_hex(sha1));
|
|
else if (stream->avail_in)
|
|
error("garbage at end of loose object '%s'",
|
|
sha1_to_hex(sha1));
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* We used to just use "sscanf()", but that's actually way
|
|
* too permissive for what we want to check. So do an anal
|
|
* object header parse by hand.
|
|
*/
|
|
static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
|
|
unsigned int flags)
|
|
{
|
|
const char *type_buf = hdr;
|
|
unsigned long size;
|
|
int type, type_len = 0;
|
|
|
|
/*
|
|
* The type can be of any size but is followed by
|
|
* a space.
|
|
*/
|
|
for (;;) {
|
|
char c = *hdr++;
|
|
if (!c)
|
|
return -1;
|
|
if (c == ' ')
|
|
break;
|
|
type_len++;
|
|
}
|
|
|
|
type = type_from_string_gently(type_buf, type_len, 1);
|
|
if (oi->typename)
|
|
strbuf_add(oi->typename, type_buf, type_len);
|
|
/*
|
|
* Set type to 0 if its an unknown object and
|
|
* we're obtaining the type using '--allow-unknown-type'
|
|
* option.
|
|
*/
|
|
if ((flags & LOOKUP_UNKNOWN_OBJECT) && (type < 0))
|
|
type = 0;
|
|
else if (type < 0)
|
|
die("invalid object type");
|
|
if (oi->typep)
|
|
*oi->typep = type;
|
|
|
|
/*
|
|
* The length must follow immediately, and be in canonical
|
|
* decimal format (ie "010" is not valid).
|
|
*/
|
|
size = *hdr++ - '0';
|
|
if (size > 9)
|
|
return -1;
|
|
if (size) {
|
|
for (;;) {
|
|
unsigned long c = *hdr - '0';
|
|
if (c > 9)
|
|
break;
|
|
hdr++;
|
|
size = size * 10 + c;
|
|
}
|
|
}
|
|
|
|
if (oi->sizep)
|
|
*oi->sizep = size;
|
|
|
|
/*
|
|
* The length must be followed by a zero byte
|
|
*/
|
|
return *hdr ? -1 : type;
|
|
}
|
|
|
|
int parse_sha1_header(const char *hdr, unsigned long *sizep)
|
|
{
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
|
|
oi.sizep = sizep;
|
|
return parse_sha1_header_extended(hdr, &oi, LOOKUP_REPLACE_OBJECT);
|
|
}
|
|
|
|
static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
|
|
{
|
|
int ret;
|
|
git_zstream stream;
|
|
char hdr[8192];
|
|
|
|
ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
|
|
if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
|
|
return NULL;
|
|
|
|
return unpack_sha1_rest(&stream, hdr, *size, sha1);
|
|
}
|
|
|
|
unsigned long get_size_from_delta(struct packed_git *p,
|
|
struct pack_window **w_curs,
|
|
off_t curpos)
|
|
{
|
|
const unsigned char *data;
|
|
unsigned char delta_head[20], *in;
|
|
git_zstream stream;
|
|
int st;
|
|
|
|
memset(&stream, 0, sizeof(stream));
|
|
stream.next_out = delta_head;
|
|
stream.avail_out = sizeof(delta_head);
|
|
|
|
git_inflate_init(&stream);
|
|
do {
|
|
in = use_pack(p, w_curs, curpos, &stream.avail_in);
|
|
stream.next_in = in;
|
|
st = git_inflate(&stream, Z_FINISH);
|
|
curpos += stream.next_in - in;
|
|
} while ((st == Z_OK || st == Z_BUF_ERROR) &&
|
|
stream.total_out < sizeof(delta_head));
|
|
git_inflate_end(&stream);
|
|
if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
|
|
error("delta data unpack-initial failed");
|
|
return 0;
|
|
}
|
|
|
|
/* Examine the initial part of the delta to figure out
|
|
* the result size.
|
|
*/
|
|
data = delta_head;
|
|
|
|
/* ignore base size */
|
|
get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
|
|
|
|
/* Read the result size */
|
|
return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
|
|
}
|
|
|
|
static off_t get_delta_base(struct packed_git *p,
|
|
struct pack_window **w_curs,
|
|
off_t *curpos,
|
|
enum object_type type,
|
|
off_t delta_obj_offset)
|
|
{
|
|
unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
|
|
off_t base_offset;
|
|
|
|
/* use_pack() assured us we have [base_info, base_info + 20)
|
|
* as a range that we can look at without walking off the
|
|
* end of the mapped window. Its actually the hash size
|
|
* that is assured. An OFS_DELTA longer than the hash size
|
|
* is stupid, as then a REF_DELTA would be smaller to store.
|
|
*/
|
|
if (type == OBJ_OFS_DELTA) {
|
|
unsigned used = 0;
|
|
unsigned char c = base_info[used++];
|
|
base_offset = c & 127;
|
|
while (c & 128) {
|
|
base_offset += 1;
|
|
if (!base_offset || MSB(base_offset, 7))
|
|
return 0; /* overflow */
|
|
c = base_info[used++];
|
|
base_offset = (base_offset << 7) + (c & 127);
|
|
}
|
|
base_offset = delta_obj_offset - base_offset;
|
|
if (base_offset <= 0 || base_offset >= delta_obj_offset)
|
|
return 0; /* out of bound */
|
|
*curpos += used;
|
|
} else if (type == OBJ_REF_DELTA) {
|
|
/* The base entry _must_ be in the same pack */
|
|
base_offset = find_pack_entry_one(base_info, p);
|
|
*curpos += 20;
|
|
} else
|
|
die("I am totally screwed");
|
|
return base_offset;
|
|
}
|
|
|
|
/*
|
|
* Like get_delta_base above, but we return the sha1 instead of the pack
|
|
* offset. This means it is cheaper for REF deltas (we do not have to do
|
|
* the final object lookup), but more expensive for OFS deltas (we
|
|
* have to load the revidx to convert the offset back into a sha1).
|
|
*/
|
|
static const unsigned char *get_delta_base_sha1(struct packed_git *p,
|
|
struct pack_window **w_curs,
|
|
off_t curpos,
|
|
enum object_type type,
|
|
off_t delta_obj_offset)
|
|
{
|
|
if (type == OBJ_REF_DELTA) {
|
|
unsigned char *base = use_pack(p, w_curs, curpos, NULL);
|
|
return base;
|
|
} else if (type == OBJ_OFS_DELTA) {
|
|
struct revindex_entry *revidx;
|
|
off_t base_offset = get_delta_base(p, w_curs, &curpos,
|
|
type, delta_obj_offset);
|
|
|
|
if (!base_offset)
|
|
return NULL;
|
|
|
|
revidx = find_pack_revindex(p, base_offset);
|
|
if (!revidx)
|
|
return NULL;
|
|
|
|
return nth_packed_object_sha1(p, revidx->nr);
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
int unpack_object_header(struct packed_git *p,
|
|
struct pack_window **w_curs,
|
|
off_t *curpos,
|
|
unsigned long *sizep)
|
|
{
|
|
unsigned char *base;
|
|
unsigned long left;
|
|
unsigned long used;
|
|
enum object_type type;
|
|
|
|
/* use_pack() assures us we have [base, base + 20) available
|
|
* as a range that we can look at. (Its actually the hash
|
|
* size that is assured.) With our object header encoding
|
|
* the maximum deflated object size is 2^137, which is just
|
|
* insane, so we know won't exceed what we have been given.
|
|
*/
|
|
base = use_pack(p, w_curs, *curpos, &left);
|
|
used = unpack_object_header_buffer(base, left, &type, sizep);
|
|
if (!used) {
|
|
type = OBJ_BAD;
|
|
} else
|
|
*curpos += used;
|
|
|
|
return type;
|
|
}
|
|
|
|
static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset)
|
|
{
|
|
int type;
|
|
struct revindex_entry *revidx;
|
|
const unsigned char *sha1;
|
|
revidx = find_pack_revindex(p, obj_offset);
|
|
if (!revidx)
|
|
return OBJ_BAD;
|
|
sha1 = nth_packed_object_sha1(p, revidx->nr);
|
|
mark_bad_packed_object(p, sha1);
|
|
type = sha1_object_info(sha1, NULL);
|
|
if (type <= OBJ_NONE)
|
|
return OBJ_BAD;
|
|
return type;
|
|
}
|
|
|
|
#define POI_STACK_PREALLOC 64
|
|
|
|
static enum object_type packed_to_object_type(struct packed_git *p,
|
|
off_t obj_offset,
|
|
enum object_type type,
|
|
struct pack_window **w_curs,
|
|
off_t curpos)
|
|
{
|
|
off_t small_poi_stack[POI_STACK_PREALLOC];
|
|
off_t *poi_stack = small_poi_stack;
|
|
int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
|
|
|
|
while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
|
|
off_t base_offset;
|
|
unsigned long size;
|
|
/* Push the object we're going to leave behind */
|
|
if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
|
|
poi_stack_alloc = alloc_nr(poi_stack_nr);
|
|
ALLOC_ARRAY(poi_stack, poi_stack_alloc);
|
|
memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr);
|
|
} else {
|
|
ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
|
|
}
|
|
poi_stack[poi_stack_nr++] = obj_offset;
|
|
/* If parsing the base offset fails, just unwind */
|
|
base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
|
|
if (!base_offset)
|
|
goto unwind;
|
|
curpos = obj_offset = base_offset;
|
|
type = unpack_object_header(p, w_curs, &curpos, &size);
|
|
if (type <= OBJ_NONE) {
|
|
/* If getting the base itself fails, we first
|
|
* retry the base, otherwise unwind */
|
|
type = retry_bad_packed_offset(p, base_offset);
|
|
if (type > OBJ_NONE)
|
|
goto out;
|
|
goto unwind;
|
|
}
|
|
}
|
|
|
|
switch (type) {
|
|
case OBJ_BAD:
|
|
case OBJ_COMMIT:
|
|
case OBJ_TREE:
|
|
case OBJ_BLOB:
|
|
case OBJ_TAG:
|
|
break;
|
|
default:
|
|
error("unknown object type %i at offset %"PRIuMAX" in %s",
|
|
type, (uintmax_t)obj_offset, p->pack_name);
|
|
type = OBJ_BAD;
|
|
}
|
|
|
|
out:
|
|
if (poi_stack != small_poi_stack)
|
|
free(poi_stack);
|
|
return type;
|
|
|
|
unwind:
|
|
while (poi_stack_nr) {
|
|
obj_offset = poi_stack[--poi_stack_nr];
|
|
type = retry_bad_packed_offset(p, obj_offset);
|
|
if (type > OBJ_NONE)
|
|
goto out;
|
|
}
|
|
type = OBJ_BAD;
|
|
goto out;
|
|
}
|
|
|
|
int packed_object_info(struct packed_git *p, off_t obj_offset,
|
|
struct object_info *oi)
|
|
{
|
|
struct pack_window *w_curs = NULL;
|
|
unsigned long size;
|
|
off_t curpos = obj_offset;
|
|
enum object_type type;
|
|
|
|
/*
|
|
* We always get the representation type, but only convert it to
|
|
* a "real" type later if the caller is interested.
|
|
*/
|
|
type = unpack_object_header(p, &w_curs, &curpos, &size);
|
|
|
|
if (oi->sizep) {
|
|
if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
|
|
off_t tmp_pos = curpos;
|
|
off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
|
|
type, obj_offset);
|
|
if (!base_offset) {
|
|
type = OBJ_BAD;
|
|
goto out;
|
|
}
|
|
*oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
|
|
if (*oi->sizep == 0) {
|
|
type = OBJ_BAD;
|
|
goto out;
|
|
}
|
|
} else {
|
|
*oi->sizep = size;
|
|
}
|
|
}
|
|
|
|
if (oi->disk_sizep) {
|
|
struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
|
|
*oi->disk_sizep = revidx[1].offset - obj_offset;
|
|
}
|
|
|
|
if (oi->typep) {
|
|
*oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos);
|
|
if (*oi->typep < 0) {
|
|
type = OBJ_BAD;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (oi->delta_base_sha1) {
|
|
if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
|
|
const unsigned char *base;
|
|
|
|
base = get_delta_base_sha1(p, &w_curs, curpos,
|
|
type, obj_offset);
|
|
if (!base) {
|
|
type = OBJ_BAD;
|
|
goto out;
|
|
}
|
|
|
|
hashcpy(oi->delta_base_sha1, base);
|
|
} else
|
|
hashclr(oi->delta_base_sha1);
|
|
}
|
|
|
|
out:
|
|
unuse_pack(&w_curs);
|
|
return type;
|
|
}
|
|
|
|
static void *unpack_compressed_entry(struct packed_git *p,
|
|
struct pack_window **w_curs,
|
|
off_t curpos,
|
|
unsigned long size)
|
|
{
|
|
int st;
|
|
git_zstream stream;
|
|
unsigned char *buffer, *in;
|
|
|
|
buffer = xmallocz_gently(size);
|
|
if (!buffer)
|
|
return NULL;
|
|
memset(&stream, 0, sizeof(stream));
|
|
stream.next_out = buffer;
|
|
stream.avail_out = size + 1;
|
|
|
|
git_inflate_init(&stream);
|
|
do {
|
|
in = use_pack(p, w_curs, curpos, &stream.avail_in);
|
|
stream.next_in = in;
|
|
st = git_inflate(&stream, Z_FINISH);
|
|
if (!stream.avail_out)
|
|
break; /* the payload is larger than it should be */
|
|
curpos += stream.next_in - in;
|
|
} while (st == Z_OK || st == Z_BUF_ERROR);
|
|
git_inflate_end(&stream);
|
|
if ((st != Z_STREAM_END) || stream.total_out != size) {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static struct hashmap delta_base_cache;
|
|
static size_t delta_base_cached;
|
|
|
|
static LIST_HEAD(delta_base_cache_lru);
|
|
|
|
struct delta_base_cache_key {
|
|
struct packed_git *p;
|
|
off_t base_offset;
|
|
};
|
|
|
|
struct delta_base_cache_entry {
|
|
struct hashmap hash;
|
|
struct delta_base_cache_key key;
|
|
struct list_head lru;
|
|
void *data;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
};
|
|
|
|
static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
|
|
{
|
|
unsigned int hash;
|
|
|
|
hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
|
|
hash += (hash >> 8) + (hash >> 16);
|
|
return hash;
|
|
}
|
|
|
|
static struct delta_base_cache_entry *
|
|
get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
|
|
{
|
|
struct hashmap_entry entry;
|
|
struct delta_base_cache_key key;
|
|
|
|
if (!delta_base_cache.cmpfn)
|
|
return NULL;
|
|
|
|
hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
|
|
key.p = p;
|
|
key.base_offset = base_offset;
|
|
return hashmap_get(&delta_base_cache, &entry, &key);
|
|
}
|
|
|
|
static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
|
|
const struct delta_base_cache_key *b)
|
|
{
|
|
return a->p == b->p && a->base_offset == b->base_offset;
|
|
}
|
|
|
|
static int delta_base_cache_hash_cmp(const void *va, const void *vb,
|
|
const void *vkey)
|
|
{
|
|
const struct delta_base_cache_entry *a = va, *b = vb;
|
|
const struct delta_base_cache_key *key = vkey;
|
|
if (key)
|
|
return !delta_base_cache_key_eq(&a->key, key);
|
|
else
|
|
return !delta_base_cache_key_eq(&a->key, &b->key);
|
|
}
|
|
|
|
static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
|
|
{
|
|
return !!get_delta_base_cache_entry(p, base_offset);
|
|
}
|
|
|
|
/*
|
|
* Remove the entry from the cache, but do _not_ free the associated
|
|
* entry data. The caller takes ownership of the "data" buffer, and
|
|
* should copy out any fields it wants before detaching.
|
|
*/
|
|
static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
|
|
{
|
|
hashmap_remove(&delta_base_cache, ent, &ent->key);
|
|
list_del(&ent->lru);
|
|
delta_base_cached -= ent->size;
|
|
free(ent);
|
|
}
|
|
|
|
static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
|
|
unsigned long *base_size, enum object_type *type)
|
|
{
|
|
struct delta_base_cache_entry *ent;
|
|
|
|
ent = get_delta_base_cache_entry(p, base_offset);
|
|
if (!ent)
|
|
return unpack_entry(p, base_offset, type, base_size);
|
|
|
|
*type = ent->type;
|
|
*base_size = ent->size;
|
|
return xmemdupz(ent->data, ent->size);
|
|
}
|
|
|
|
static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
|
|
{
|
|
free(ent->data);
|
|
detach_delta_base_cache_entry(ent);
|
|
}
|
|
|
|
void clear_delta_base_cache(void)
|
|
{
|
|
struct list_head *lru, *tmp;
|
|
list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
|
|
struct delta_base_cache_entry *entry =
|
|
list_entry(lru, struct delta_base_cache_entry, lru);
|
|
release_delta_base_cache(entry);
|
|
}
|
|
}
|
|
|
|
static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
|
|
void *base, unsigned long base_size, enum object_type type)
|
|
{
|
|
struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
|
|
struct list_head *lru, *tmp;
|
|
|
|
delta_base_cached += base_size;
|
|
|
|
list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
|
|
struct delta_base_cache_entry *f =
|
|
list_entry(lru, struct delta_base_cache_entry, lru);
|
|
if (delta_base_cached <= delta_base_cache_limit)
|
|
break;
|
|
release_delta_base_cache(f);
|
|
}
|
|
|
|
ent->key.p = p;
|
|
ent->key.base_offset = base_offset;
|
|
ent->type = type;
|
|
ent->data = base;
|
|
ent->size = base_size;
|
|
list_add_tail(&ent->lru, &delta_base_cache_lru);
|
|
|
|
if (!delta_base_cache.cmpfn)
|
|
hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, 0);
|
|
hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
|
|
hashmap_add(&delta_base_cache, ent);
|
|
}
|
|
|
|
static void *read_object(const unsigned char *sha1, enum object_type *type,
|
|
unsigned long *size);
|
|
|
|
static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
|
|
{
|
|
static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
|
|
trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
|
|
p->pack_name, (uintmax_t)obj_offset);
|
|
}
|
|
|
|
int do_check_packed_object_crc;
|
|
|
|
#define UNPACK_ENTRY_STACK_PREALLOC 64
|
|
struct unpack_entry_stack_ent {
|
|
off_t obj_offset;
|
|
off_t curpos;
|
|
unsigned long size;
|
|
};
|
|
|
|
void *unpack_entry(struct packed_git *p, off_t obj_offset,
|
|
enum object_type *final_type, unsigned long *final_size)
|
|
{
|
|
struct pack_window *w_curs = NULL;
|
|
off_t curpos = obj_offset;
|
|
void *data = NULL;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
|
|
struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
|
|
int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
|
|
int base_from_cache = 0;
|
|
|
|
write_pack_access_log(p, obj_offset);
|
|
|
|
/* PHASE 1: drill down to the innermost base object */
|
|
for (;;) {
|
|
off_t base_offset;
|
|
int i;
|
|
struct delta_base_cache_entry *ent;
|
|
|
|
ent = get_delta_base_cache_entry(p, curpos);
|
|
if (ent) {
|
|
type = ent->type;
|
|
data = ent->data;
|
|
size = ent->size;
|
|
detach_delta_base_cache_entry(ent);
|
|
base_from_cache = 1;
|
|
break;
|
|
}
|
|
|
|
if (do_check_packed_object_crc && p->index_version > 1) {
|
|
struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
|
|
off_t len = revidx[1].offset - obj_offset;
|
|
if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
|
|
const unsigned char *sha1 =
|
|
nth_packed_object_sha1(p, revidx->nr);
|
|
error("bad packed object CRC for %s",
|
|
sha1_to_hex(sha1));
|
|
mark_bad_packed_object(p, sha1);
|
|
unuse_pack(&w_curs);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
type = unpack_object_header(p, &w_curs, &curpos, &size);
|
|
if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
|
|
break;
|
|
|
|
base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
|
|
if (!base_offset) {
|
|
error("failed to validate delta base reference "
|
|
"at offset %"PRIuMAX" from %s",
|
|
(uintmax_t)curpos, p->pack_name);
|
|
/* bail to phase 2, in hopes of recovery */
|
|
data = NULL;
|
|
break;
|
|
}
|
|
|
|
/* push object, proceed to base */
|
|
if (delta_stack_nr >= delta_stack_alloc
|
|
&& delta_stack == small_delta_stack) {
|
|
delta_stack_alloc = alloc_nr(delta_stack_nr);
|
|
ALLOC_ARRAY(delta_stack, delta_stack_alloc);
|
|
memcpy(delta_stack, small_delta_stack,
|
|
sizeof(*delta_stack)*delta_stack_nr);
|
|
} else {
|
|
ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
|
|
}
|
|
i = delta_stack_nr++;
|
|
delta_stack[i].obj_offset = obj_offset;
|
|
delta_stack[i].curpos = curpos;
|
|
delta_stack[i].size = size;
|
|
|
|
curpos = obj_offset = base_offset;
|
|
}
|
|
|
|
/* PHASE 2: handle the base */
|
|
switch (type) {
|
|
case OBJ_OFS_DELTA:
|
|
case OBJ_REF_DELTA:
|
|
if (data)
|
|
die("BUG: unpack_entry: left loop at a valid delta");
|
|
break;
|
|
case OBJ_COMMIT:
|
|
case OBJ_TREE:
|
|
case OBJ_BLOB:
|
|
case OBJ_TAG:
|
|
if (!base_from_cache)
|
|
data = unpack_compressed_entry(p, &w_curs, curpos, size);
|
|
break;
|
|
default:
|
|
data = NULL;
|
|
error("unknown object type %i at offset %"PRIuMAX" in %s",
|
|
type, (uintmax_t)obj_offset, p->pack_name);
|
|
}
|
|
|
|
/* PHASE 3: apply deltas in order */
|
|
|
|
/* invariants:
|
|
* 'data' holds the base data, or NULL if there was corruption
|
|
*/
|
|
while (delta_stack_nr) {
|
|
void *delta_data;
|
|
void *base = data;
|
|
void *external_base = NULL;
|
|
unsigned long delta_size, base_size = size;
|
|
int i;
|
|
|
|
data = NULL;
|
|
|
|
if (base)
|
|
add_delta_base_cache(p, obj_offset, base, base_size, type);
|
|
|
|
if (!base) {
|
|
/*
|
|
* We're probably in deep shit, but let's try to fetch
|
|
* the required base anyway from another pack or loose.
|
|
* This is costly but should happen only in the presence
|
|
* of a corrupted pack, and is better than failing outright.
|
|
*/
|
|
struct revindex_entry *revidx;
|
|
const unsigned char *base_sha1;
|
|
revidx = find_pack_revindex(p, obj_offset);
|
|
if (revidx) {
|
|
base_sha1 = nth_packed_object_sha1(p, revidx->nr);
|
|
error("failed to read delta base object %s"
|
|
" at offset %"PRIuMAX" from %s",
|
|
sha1_to_hex(base_sha1), (uintmax_t)obj_offset,
|
|
p->pack_name);
|
|
mark_bad_packed_object(p, base_sha1);
|
|
base = read_object(base_sha1, &type, &base_size);
|
|
external_base = base;
|
|
}
|
|
}
|
|
|
|
i = --delta_stack_nr;
|
|
obj_offset = delta_stack[i].obj_offset;
|
|
curpos = delta_stack[i].curpos;
|
|
delta_size = delta_stack[i].size;
|
|
|
|
if (!base)
|
|
continue;
|
|
|
|
delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
|
|
|
|
if (!delta_data) {
|
|
error("failed to unpack compressed delta "
|
|
"at offset %"PRIuMAX" from %s",
|
|
(uintmax_t)curpos, p->pack_name);
|
|
data = NULL;
|
|
free(external_base);
|
|
continue;
|
|
}
|
|
|
|
data = patch_delta(base, base_size,
|
|
delta_data, delta_size,
|
|
&size);
|
|
|
|
/*
|
|
* We could not apply the delta; warn the user, but keep going.
|
|
* Our failure will be noticed either in the next iteration of
|
|
* the loop, or if this is the final delta, in the caller when
|
|
* we return NULL. Those code paths will take care of making
|
|
* a more explicit warning and retrying with another copy of
|
|
* the object.
|
|
*/
|
|
if (!data)
|
|
error("failed to apply delta");
|
|
|
|
free(delta_data);
|
|
free(external_base);
|
|
}
|
|
|
|
*final_type = type;
|
|
*final_size = size;
|
|
|
|
unuse_pack(&w_curs);
|
|
|
|
if (delta_stack != small_delta_stack)
|
|
free(delta_stack);
|
|
|
|
return data;
|
|
}
|
|
|
|
const unsigned char *nth_packed_object_sha1(struct packed_git *p,
|
|
uint32_t n)
|
|
{
|
|
const unsigned char *index = p->index_data;
|
|
if (!index) {
|
|
if (open_pack_index(p))
|
|
return NULL;
|
|
index = p->index_data;
|
|
}
|
|
if (n >= p->num_objects)
|
|
return NULL;
|
|
index += 4 * 256;
|
|
if (p->index_version == 1) {
|
|
return index + 24 * n + 4;
|
|
} else {
|
|
index += 8;
|
|
return index + 20 * n;
|
|
}
|
|
}
|
|
|
|
const struct object_id *nth_packed_object_oid(struct object_id *oid,
|
|
struct packed_git *p,
|
|
uint32_t n)
|
|
{
|
|
const unsigned char *hash = nth_packed_object_sha1(p, n);
|
|
if (!hash)
|
|
return NULL;
|
|
hashcpy(oid->hash, hash);
|
|
return oid;
|
|
}
|
|
|
|
void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
|
|
{
|
|
const unsigned char *ptr = vptr;
|
|
const unsigned char *start = p->index_data;
|
|
const unsigned char *end = start + p->index_size;
|
|
if (ptr < start)
|
|
die(_("offset before start of pack index for %s (corrupt index?)"),
|
|
p->pack_name);
|
|
/* No need to check for underflow; .idx files must be at least 8 bytes */
|
|
if (ptr >= end - 8)
|
|
die(_("offset beyond end of pack index for %s (truncated index?)"),
|
|
p->pack_name);
|
|
}
|
|
|
|
off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
|
|
{
|
|
const unsigned char *index = p->index_data;
|
|
index += 4 * 256;
|
|
if (p->index_version == 1) {
|
|
return ntohl(*((uint32_t *)(index + 24 * n)));
|
|
} else {
|
|
uint32_t off;
|
|
index += 8 + p->num_objects * (20 + 4);
|
|
off = ntohl(*((uint32_t *)(index + 4 * n)));
|
|
if (!(off & 0x80000000))
|
|
return off;
|
|
index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
|
|
check_pack_index_ptr(p, index);
|
|
return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
|
|
ntohl(*((uint32_t *)(index + 4)));
|
|
}
|
|
}
|
|
|
|
off_t find_pack_entry_one(const unsigned char *sha1,
|
|
struct packed_git *p)
|
|
{
|
|
const uint32_t *level1_ofs = p->index_data;
|
|
const unsigned char *index = p->index_data;
|
|
unsigned hi, lo, stride;
|
|
static int use_lookup = -1;
|
|
static int debug_lookup = -1;
|
|
|
|
if (debug_lookup < 0)
|
|
debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
|
|
|
|
if (!index) {
|
|
if (open_pack_index(p))
|
|
return 0;
|
|
level1_ofs = p->index_data;
|
|
index = p->index_data;
|
|
}
|
|
if (p->index_version > 1) {
|
|
level1_ofs += 2;
|
|
index += 8;
|
|
}
|
|
index += 4 * 256;
|
|
hi = ntohl(level1_ofs[*sha1]);
|
|
lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
|
|
if (p->index_version > 1) {
|
|
stride = 20;
|
|
} else {
|
|
stride = 24;
|
|
index += 4;
|
|
}
|
|
|
|
if (debug_lookup)
|
|
printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n",
|
|
sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
|
|
|
|
if (use_lookup < 0)
|
|
use_lookup = !!getenv("GIT_USE_LOOKUP");
|
|
if (use_lookup) {
|
|
int pos = sha1_entry_pos(index, stride, 0,
|
|
lo, hi, p->num_objects, sha1);
|
|
if (pos < 0)
|
|
return 0;
|
|
return nth_packed_object_offset(p, pos);
|
|
}
|
|
|
|
do {
|
|
unsigned mi = (lo + hi) / 2;
|
|
int cmp = hashcmp(index + mi * stride, sha1);
|
|
|
|
if (debug_lookup)
|
|
printf("lo %u hi %u rg %u mi %u\n",
|
|
lo, hi, hi - lo, mi);
|
|
if (!cmp)
|
|
return nth_packed_object_offset(p, mi);
|
|
if (cmp > 0)
|
|
hi = mi;
|
|
else
|
|
lo = mi+1;
|
|
} while (lo < hi);
|
|
return 0;
|
|
}
|
|
|
|
int is_pack_valid(struct packed_git *p)
|
|
{
|
|
/* An already open pack is known to be valid. */
|
|
if (p->pack_fd != -1)
|
|
return 1;
|
|
|
|
/* If the pack has one window completely covering the
|
|
* file size, the pack is known to be valid even if
|
|
* the descriptor is not currently open.
|
|
*/
|
|
if (p->windows) {
|
|
struct pack_window *w = p->windows;
|
|
|
|
if (!w->offset && w->len == p->pack_size)
|
|
return 1;
|
|
}
|
|
|
|
/* Force the pack to open to prove its valid. */
|
|
return !open_packed_git(p);
|
|
}
|
|
|
|
static int fill_pack_entry(const unsigned char *sha1,
|
|
struct pack_entry *e,
|
|
struct packed_git *p)
|
|
{
|
|
off_t offset;
|
|
|
|
if (p->num_bad_objects) {
|
|
unsigned i;
|
|
for (i = 0; i < p->num_bad_objects; i++)
|
|
if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
|
|
return 0;
|
|
}
|
|
|
|
offset = find_pack_entry_one(sha1, p);
|
|
if (!offset)
|
|
return 0;
|
|
|
|
/*
|
|
* We are about to tell the caller where they can locate the
|
|
* requested object. We better make sure the packfile is
|
|
* still here and can be accessed before supplying that
|
|
* answer, as it may have been deleted since the index was
|
|
* loaded!
|
|
*/
|
|
if (!is_pack_valid(p))
|
|
return 0;
|
|
e->offset = offset;
|
|
e->p = p;
|
|
hashcpy(e->sha1, sha1);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Iff a pack file contains the object named by sha1, return true and
|
|
* store its location to e.
|
|
*/
|
|
static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
|
|
{
|
|
struct mru_entry *p;
|
|
|
|
prepare_packed_git();
|
|
if (!packed_git)
|
|
return 0;
|
|
|
|
for (p = packed_git_mru->head; p; p = p->next) {
|
|
if (fill_pack_entry(sha1, e, p->item)) {
|
|
mru_mark(packed_git_mru, p);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct packed_git *find_sha1_pack(const unsigned char *sha1,
|
|
struct packed_git *packs)
|
|
{
|
|
struct packed_git *p;
|
|
|
|
for (p = packs; p; p = p->next) {
|
|
if (find_pack_entry_one(sha1, p))
|
|
return p;
|
|
}
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static int sha1_loose_object_info(const unsigned char *sha1,
|
|
struct object_info *oi,
|
|
int flags)
|
|
{
|
|
int status = 0;
|
|
unsigned long mapsize;
|
|
void *map;
|
|
git_zstream stream;
|
|
char hdr[32];
|
|
struct strbuf hdrbuf = STRBUF_INIT;
|
|
|
|
if (oi->delta_base_sha1)
|
|
hashclr(oi->delta_base_sha1);
|
|
|
|
/*
|
|
* If we don't care about type or size, then we don't
|
|
* need to look inside the object at all. Note that we
|
|
* do not optimize out the stat call, even if the
|
|
* caller doesn't care about the disk-size, since our
|
|
* return value implicitly indicates whether the
|
|
* object even exists.
|
|
*/
|
|
if (!oi->typep && !oi->typename && !oi->sizep) {
|
|
const char *path;
|
|
struct stat st;
|
|
if (stat_sha1_file(sha1, &st, &path) < 0)
|
|
return -1;
|
|
if (oi->disk_sizep)
|
|
*oi->disk_sizep = st.st_size;
|
|
return 0;
|
|
}
|
|
|
|
map = map_sha1_file(sha1, &mapsize);
|
|
if (!map)
|
|
return -1;
|
|
if (oi->disk_sizep)
|
|
*oi->disk_sizep = mapsize;
|
|
if ((flags & LOOKUP_UNKNOWN_OBJECT)) {
|
|
if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
|
|
status = error("unable to unpack %s header with --allow-unknown-type",
|
|
sha1_to_hex(sha1));
|
|
} else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
|
|
status = error("unable to unpack %s header",
|
|
sha1_to_hex(sha1));
|
|
if (status < 0)
|
|
; /* Do nothing */
|
|
else if (hdrbuf.len) {
|
|
if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0)
|
|
status = error("unable to parse %s header with --allow-unknown-type",
|
|
sha1_to_hex(sha1));
|
|
} else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
|
|
status = error("unable to parse %s header", sha1_to_hex(sha1));
|
|
git_inflate_end(&stream);
|
|
munmap(map, mapsize);
|
|
if (status && oi->typep)
|
|
*oi->typep = status;
|
|
strbuf_release(&hdrbuf);
|
|
return 0;
|
|
}
|
|
|
|
int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
|
|
{
|
|
struct cached_object *co;
|
|
struct pack_entry e;
|
|
int rtype;
|
|
enum object_type real_type;
|
|
const unsigned char *real = lookup_replace_object_extended(sha1, flags);
|
|
|
|
co = find_cached_object(real);
|
|
if (co) {
|
|
if (oi->typep)
|
|
*(oi->typep) = co->type;
|
|
if (oi->sizep)
|
|
*(oi->sizep) = co->size;
|
|
if (oi->disk_sizep)
|
|
*(oi->disk_sizep) = 0;
|
|
if (oi->delta_base_sha1)
|
|
hashclr(oi->delta_base_sha1);
|
|
if (oi->typename)
|
|
strbuf_addstr(oi->typename, typename(co->type));
|
|
oi->whence = OI_CACHED;
|
|
return 0;
|
|
}
|
|
|
|
if (!find_pack_entry(real, &e)) {
|
|
/* Most likely it's a loose object. */
|
|
if (!sha1_loose_object_info(real, oi, flags)) {
|
|
oi->whence = OI_LOOSE;
|
|
return 0;
|
|
}
|
|
|
|
/* Not a loose object; someone else may have just packed it. */
|
|
reprepare_packed_git();
|
|
if (!find_pack_entry(real, &e))
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* packed_object_info() does not follow the delta chain to
|
|
* find out the real type, unless it is given oi->typep.
|
|
*/
|
|
if (oi->typename && !oi->typep)
|
|
oi->typep = &real_type;
|
|
|
|
rtype = packed_object_info(e.p, e.offset, oi);
|
|
if (rtype < 0) {
|
|
mark_bad_packed_object(e.p, real);
|
|
if (oi->typep == &real_type)
|
|
oi->typep = NULL;
|
|
return sha1_object_info_extended(real, oi, 0);
|
|
} else if (in_delta_base_cache(e.p, e.offset)) {
|
|
oi->whence = OI_DBCACHED;
|
|
} else {
|
|
oi->whence = OI_PACKED;
|
|
oi->u.packed.offset = e.offset;
|
|
oi->u.packed.pack = e.p;
|
|
oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
|
|
rtype == OBJ_OFS_DELTA);
|
|
}
|
|
if (oi->typename)
|
|
strbuf_addstr(oi->typename, typename(*oi->typep));
|
|
if (oi->typep == &real_type)
|
|
oi->typep = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* returns enum object_type or negative */
|
|
int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
|
|
{
|
|
enum object_type type;
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
|
|
oi.typep = &type;
|
|
oi.sizep = sizep;
|
|
if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0)
|
|
return -1;
|
|
return type;
|
|
}
|
|
|
|
static void *read_packed_sha1(const unsigned char *sha1,
|
|
enum object_type *type, unsigned long *size)
|
|
{
|
|
struct pack_entry e;
|
|
void *data;
|
|
|
|
if (!find_pack_entry(sha1, &e))
|
|
return NULL;
|
|
data = cache_or_unpack_entry(e.p, e.offset, size, type);
|
|
if (!data) {
|
|
/*
|
|
* We're probably in deep shit, but let's try to fetch
|
|
* the required object anyway from another pack or loose.
|
|
* This should happen only in the presence of a corrupted
|
|
* pack, and is better than failing outright.
|
|
*/
|
|
error("failed to read object %s at offset %"PRIuMAX" from %s",
|
|
sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name);
|
|
mark_bad_packed_object(e.p, sha1);
|
|
data = read_object(sha1, type, size);
|
|
}
|
|
return data;
|
|
}
|
|
|
|
int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
|
|
unsigned char *sha1)
|
|
{
|
|
struct cached_object *co;
|
|
|
|
hash_sha1_file(buf, len, typename(type), sha1);
|
|
if (has_sha1_file(sha1) || find_cached_object(sha1))
|
|
return 0;
|
|
ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
|
|
co = &cached_objects[cached_object_nr++];
|
|
co->size = len;
|
|
co->type = type;
|
|
co->buf = xmalloc(len);
|
|
memcpy(co->buf, buf, len);
|
|
hashcpy(co->sha1, sha1);
|
|
return 0;
|
|
}
|
|
|
|
static void *read_object(const unsigned char *sha1, enum object_type *type,
|
|
unsigned long *size)
|
|
{
|
|
unsigned long mapsize;
|
|
void *map, *buf;
|
|
struct cached_object *co;
|
|
|
|
co = find_cached_object(sha1);
|
|
if (co) {
|
|
*type = co->type;
|
|
*size = co->size;
|
|
return xmemdupz(co->buf, co->size);
|
|
}
|
|
|
|
buf = read_packed_sha1(sha1, type, size);
|
|
if (buf)
|
|
return buf;
|
|
map = map_sha1_file(sha1, &mapsize);
|
|
if (map) {
|
|
buf = unpack_sha1_file(map, mapsize, type, size, sha1);
|
|
munmap(map, mapsize);
|
|
return buf;
|
|
}
|
|
reprepare_packed_git();
|
|
return read_packed_sha1(sha1, type, size);
|
|
}
|
|
|
|
/*
|
|
* This function dies on corrupt objects; the callers who want to
|
|
* deal with them should arrange to call read_object() and give error
|
|
* messages themselves.
|
|
*/
|
|
void *read_sha1_file_extended(const unsigned char *sha1,
|
|
enum object_type *type,
|
|
unsigned long *size,
|
|
unsigned flag)
|
|
{
|
|
void *data;
|
|
const struct packed_git *p;
|
|
const char *path;
|
|
struct stat st;
|
|
const unsigned char *repl = lookup_replace_object_extended(sha1, flag);
|
|
|
|
errno = 0;
|
|
data = read_object(repl, type, size);
|
|
if (data)
|
|
return data;
|
|
|
|
if (errno && errno != ENOENT)
|
|
die_errno("failed to read object %s", sha1_to_hex(sha1));
|
|
|
|
/* die if we replaced an object with one that does not exist */
|
|
if (repl != sha1)
|
|
die("replacement %s not found for %s",
|
|
sha1_to_hex(repl), sha1_to_hex(sha1));
|
|
|
|
if (!stat_sha1_file(repl, &st, &path))
|
|
die("loose object %s (stored in %s) is corrupt",
|
|
sha1_to_hex(repl), path);
|
|
|
|
if ((p = has_packed_and_bad(repl)) != NULL)
|
|
die("packed object %s (stored in %s) is corrupt",
|
|
sha1_to_hex(repl), p->pack_name);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void *read_object_with_reference(const unsigned char *sha1,
|
|
const char *required_type_name,
|
|
unsigned long *size,
|
|
unsigned char *actual_sha1_return)
|
|
{
|
|
enum object_type type, required_type;
|
|
void *buffer;
|
|
unsigned long isize;
|
|
unsigned char actual_sha1[20];
|
|
|
|
required_type = type_from_string(required_type_name);
|
|
hashcpy(actual_sha1, sha1);
|
|
while (1) {
|
|
int ref_length = -1;
|
|
const char *ref_type = NULL;
|
|
|
|
buffer = read_sha1_file(actual_sha1, &type, &isize);
|
|
if (!buffer)
|
|
return NULL;
|
|
if (type == required_type) {
|
|
*size = isize;
|
|
if (actual_sha1_return)
|
|
hashcpy(actual_sha1_return, actual_sha1);
|
|
return buffer;
|
|
}
|
|
/* Handle references */
|
|
else if (type == OBJ_COMMIT)
|
|
ref_type = "tree ";
|
|
else if (type == OBJ_TAG)
|
|
ref_type = "object ";
|
|
else {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
ref_length = strlen(ref_type);
|
|
|
|
if (ref_length + 40 > isize ||
|
|
memcmp(buffer, ref_type, ref_length) ||
|
|
get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
free(buffer);
|
|
/* Now we have the ID of the referred-to object in
|
|
* actual_sha1. Check again. */
|
|
}
|
|
}
|
|
|
|
static void write_sha1_file_prepare(const void *buf, unsigned long len,
|
|
const char *type, unsigned char *sha1,
|
|
char *hdr, int *hdrlen)
|
|
{
|
|
git_SHA_CTX c;
|
|
|
|
/* Generate the header */
|
|
*hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
|
|
|
|
/* Sha1.. */
|
|
git_SHA1_Init(&c);
|
|
git_SHA1_Update(&c, hdr, *hdrlen);
|
|
git_SHA1_Update(&c, buf, len);
|
|
git_SHA1_Final(sha1, &c);
|
|
}
|
|
|
|
/*
|
|
* Move the just written object into its final resting place.
|
|
*/
|
|
int finalize_object_file(const char *tmpfile, const char *filename)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
|
|
goto try_rename;
|
|
else if (link(tmpfile, filename))
|
|
ret = errno;
|
|
|
|
/*
|
|
* Coda hack - coda doesn't like cross-directory links,
|
|
* so we fall back to a rename, which will mean that it
|
|
* won't be able to check collisions, but that's not a
|
|
* big deal.
|
|
*
|
|
* The same holds for FAT formatted media.
|
|
*
|
|
* When this succeeds, we just return. We have nothing
|
|
* left to unlink.
|
|
*/
|
|
if (ret && ret != EEXIST) {
|
|
try_rename:
|
|
if (!rename(tmpfile, filename))
|
|
goto out;
|
|
ret = errno;
|
|
}
|
|
unlink_or_warn(tmpfile);
|
|
if (ret) {
|
|
if (ret != EEXIST) {
|
|
return error_errno("unable to write sha1 filename %s", filename);
|
|
}
|
|
/* FIXME!!! Collision check here ? */
|
|
}
|
|
|
|
out:
|
|
if (adjust_shared_perm(filename))
|
|
return error("unable to set permission to '%s'", filename);
|
|
return 0;
|
|
}
|
|
|
|
static int write_buffer(int fd, const void *buf, size_t len)
|
|
{
|
|
if (write_in_full(fd, buf, len) < 0)
|
|
return error_errno("file write error");
|
|
return 0;
|
|
}
|
|
|
|
int hash_sha1_file(const void *buf, unsigned long len, const char *type,
|
|
unsigned char *sha1)
|
|
{
|
|
char hdr[32];
|
|
int hdrlen = sizeof(hdr);
|
|
write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
|
|
return 0;
|
|
}
|
|
|
|
/* Finalize a file on disk, and close it. */
|
|
static void close_sha1_file(int fd)
|
|
{
|
|
if (fsync_object_files)
|
|
fsync_or_die(fd, "sha1 file");
|
|
if (close(fd) != 0)
|
|
die_errno("error when closing sha1 file");
|
|
}
|
|
|
|
/* Size of directory component, including the ending '/' */
|
|
static inline int directory_size(const char *filename)
|
|
{
|
|
const char *s = strrchr(filename, '/');
|
|
if (!s)
|
|
return 0;
|
|
return s - filename + 1;
|
|
}
|
|
|
|
/*
|
|
* This creates a temporary file in the same directory as the final
|
|
* 'filename'
|
|
*
|
|
* We want to avoid cross-directory filename renames, because those
|
|
* can have problems on various filesystems (FAT, NFS, Coda).
|
|
*/
|
|
static int create_tmpfile(struct strbuf *tmp, const char *filename)
|
|
{
|
|
int fd, dirlen = directory_size(filename);
|
|
|
|
strbuf_reset(tmp);
|
|
strbuf_add(tmp, filename, dirlen);
|
|
strbuf_addstr(tmp, "tmp_obj_XXXXXX");
|
|
fd = git_mkstemp_mode(tmp->buf, 0444);
|
|
if (fd < 0 && dirlen && errno == ENOENT) {
|
|
/*
|
|
* Make sure the directory exists; note that the contents
|
|
* of the buffer are undefined after mkstemp returns an
|
|
* error, so we have to rewrite the whole buffer from
|
|
* scratch.
|
|
*/
|
|
strbuf_reset(tmp);
|
|
strbuf_add(tmp, filename, dirlen - 1);
|
|
if (mkdir(tmp->buf, 0777) && errno != EEXIST)
|
|
return -1;
|
|
if (adjust_shared_perm(tmp->buf))
|
|
return -1;
|
|
|
|
/* Try again */
|
|
strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
|
|
fd = git_mkstemp_mode(tmp->buf, 0444);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
|
|
const void *buf, unsigned long len, time_t mtime)
|
|
{
|
|
int fd, ret;
|
|
unsigned char compressed[4096];
|
|
git_zstream stream;
|
|
git_SHA_CTX c;
|
|
unsigned char parano_sha1[20];
|
|
static struct strbuf tmp_file = STRBUF_INIT;
|
|
const char *filename = sha1_file_name(sha1);
|
|
|
|
fd = create_tmpfile(&tmp_file, filename);
|
|
if (fd < 0) {
|
|
if (errno == EACCES)
|
|
return error("insufficient permission for adding an object to repository database %s", get_object_directory());
|
|
else
|
|
return error_errno("unable to create temporary file");
|
|
}
|
|
|
|
/* Set it up */
|
|
git_deflate_init(&stream, zlib_compression_level);
|
|
stream.next_out = compressed;
|
|
stream.avail_out = sizeof(compressed);
|
|
git_SHA1_Init(&c);
|
|
|
|
/* First header.. */
|
|
stream.next_in = (unsigned char *)hdr;
|
|
stream.avail_in = hdrlen;
|
|
while (git_deflate(&stream, 0) == Z_OK)
|
|
; /* nothing */
|
|
git_SHA1_Update(&c, hdr, hdrlen);
|
|
|
|
/* Then the data itself.. */
|
|
stream.next_in = (void *)buf;
|
|
stream.avail_in = len;
|
|
do {
|
|
unsigned char *in0 = stream.next_in;
|
|
ret = git_deflate(&stream, Z_FINISH);
|
|
git_SHA1_Update(&c, in0, stream.next_in - in0);
|
|
if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
|
|
die("unable to write sha1 file");
|
|
stream.next_out = compressed;
|
|
stream.avail_out = sizeof(compressed);
|
|
} while (ret == Z_OK);
|
|
|
|
if (ret != Z_STREAM_END)
|
|
die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
|
|
ret = git_deflate_end_gently(&stream);
|
|
if (ret != Z_OK)
|
|
die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
|
|
git_SHA1_Final(parano_sha1, &c);
|
|
if (hashcmp(sha1, parano_sha1) != 0)
|
|
die("confused by unstable object source data for %s", sha1_to_hex(sha1));
|
|
|
|
close_sha1_file(fd);
|
|
|
|
if (mtime) {
|
|
struct utimbuf utb;
|
|
utb.actime = mtime;
|
|
utb.modtime = mtime;
|
|
if (utime(tmp_file.buf, &utb) < 0)
|
|
warning_errno("failed utime() on %s", tmp_file.buf);
|
|
}
|
|
|
|
return finalize_object_file(tmp_file.buf, filename);
|
|
}
|
|
|
|
static int freshen_loose_object(const unsigned char *sha1)
|
|
{
|
|
return check_and_freshen(sha1, 1);
|
|
}
|
|
|
|
static int freshen_packed_object(const unsigned char *sha1)
|
|
{
|
|
struct pack_entry e;
|
|
if (!find_pack_entry(sha1, &e))
|
|
return 0;
|
|
if (e.p->freshened)
|
|
return 1;
|
|
if (!freshen_file(e.p->pack_name))
|
|
return 0;
|
|
e.p->freshened = 1;
|
|
return 1;
|
|
}
|
|
|
|
int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1)
|
|
{
|
|
char hdr[32];
|
|
int hdrlen = sizeof(hdr);
|
|
|
|
/* Normally if we have it in the pack then we do not bother writing
|
|
* it out into .git/objects/??/?{38} file.
|
|
*/
|
|
write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
|
|
if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
|
|
return 0;
|
|
return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
|
|
}
|
|
|
|
int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
|
|
unsigned char *sha1, unsigned flags)
|
|
{
|
|
char *header;
|
|
int hdrlen, status = 0;
|
|
|
|
/* type string, SP, %lu of the length plus NUL must fit this */
|
|
hdrlen = strlen(type) + 32;
|
|
header = xmalloc(hdrlen);
|
|
write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen);
|
|
|
|
if (!(flags & HASH_WRITE_OBJECT))
|
|
goto cleanup;
|
|
if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
|
|
goto cleanup;
|
|
status = write_loose_object(sha1, header, hdrlen, buf, len, 0);
|
|
|
|
cleanup:
|
|
free(header);
|
|
return status;
|
|
}
|
|
|
|
int force_object_loose(const unsigned char *sha1, time_t mtime)
|
|
{
|
|
void *buf;
|
|
unsigned long len;
|
|
enum object_type type;
|
|
char hdr[32];
|
|
int hdrlen;
|
|
int ret;
|
|
|
|
if (has_loose_object(sha1))
|
|
return 0;
|
|
buf = read_packed_sha1(sha1, &type, &len);
|
|
if (!buf)
|
|
return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
|
|
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
|
|
ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int has_pack_index(const unsigned char *sha1)
|
|
{
|
|
struct stat st;
|
|
if (stat(sha1_pack_index_name(sha1), &st))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int has_sha1_pack(const unsigned char *sha1)
|
|
{
|
|
struct pack_entry e;
|
|
return find_pack_entry(sha1, &e);
|
|
}
|
|
|
|
int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
|
|
{
|
|
struct pack_entry e;
|
|
|
|
if (find_pack_entry(sha1, &e))
|
|
return 1;
|
|
if (has_loose_object(sha1))
|
|
return 1;
|
|
if (flags & HAS_SHA1_QUICK)
|
|
return 0;
|
|
reprepare_packed_git();
|
|
return find_pack_entry(sha1, &e);
|
|
}
|
|
|
|
int has_object_file(const struct object_id *oid)
|
|
{
|
|
return has_sha1_file(oid->hash);
|
|
}
|
|
|
|
int has_object_file_with_flags(const struct object_id *oid, int flags)
|
|
{
|
|
return has_sha1_file_with_flags(oid->hash, flags);
|
|
}
|
|
|
|
static void check_tree(const void *buf, size_t size)
|
|
{
|
|
struct tree_desc desc;
|
|
struct name_entry entry;
|
|
|
|
init_tree_desc(&desc, buf, size);
|
|
while (tree_entry(&desc, &entry))
|
|
/* do nothing
|
|
* tree_entry() will die() on malformed entries */
|
|
;
|
|
}
|
|
|
|
static void check_commit(const void *buf, size_t size)
|
|
{
|
|
struct commit c;
|
|
memset(&c, 0, sizeof(c));
|
|
if (parse_commit_buffer(&c, buf, size))
|
|
die("corrupt commit");
|
|
}
|
|
|
|
static void check_tag(const void *buf, size_t size)
|
|
{
|
|
struct tag t;
|
|
memset(&t, 0, sizeof(t));
|
|
if (parse_tag_buffer(&t, buf, size))
|
|
die("corrupt tag");
|
|
}
|
|
|
|
static int index_mem(unsigned char *sha1, void *buf, size_t size,
|
|
enum object_type type,
|
|
const char *path, unsigned flags)
|
|
{
|
|
int ret, re_allocated = 0;
|
|
int write_object = flags & HASH_WRITE_OBJECT;
|
|
|
|
if (!type)
|
|
type = OBJ_BLOB;
|
|
|
|
/*
|
|
* Convert blobs to git internal format
|
|
*/
|
|
if ((type == OBJ_BLOB) && path) {
|
|
struct strbuf nbuf = STRBUF_INIT;
|
|
if (convert_to_git(path, buf, size, &nbuf,
|
|
write_object ? safe_crlf : SAFE_CRLF_FALSE)) {
|
|
buf = strbuf_detach(&nbuf, &size);
|
|
re_allocated = 1;
|
|
}
|
|
}
|
|
if (flags & HASH_FORMAT_CHECK) {
|
|
if (type == OBJ_TREE)
|
|
check_tree(buf, size);
|
|
if (type == OBJ_COMMIT)
|
|
check_commit(buf, size);
|
|
if (type == OBJ_TAG)
|
|
check_tag(buf, size);
|
|
}
|
|
|
|
if (write_object)
|
|
ret = write_sha1_file(buf, size, typename(type), sha1);
|
|
else
|
|
ret = hash_sha1_file(buf, size, typename(type), sha1);
|
|
if (re_allocated)
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_stream_convert_blob(unsigned char *sha1, int fd,
|
|
const char *path, unsigned flags)
|
|
{
|
|
int ret;
|
|
const int write_object = flags & HASH_WRITE_OBJECT;
|
|
struct strbuf sbuf = STRBUF_INIT;
|
|
|
|
assert(path);
|
|
assert(would_convert_to_git_filter_fd(path));
|
|
|
|
convert_to_git_filter_fd(path, fd, &sbuf,
|
|
write_object ? safe_crlf : SAFE_CRLF_FALSE);
|
|
|
|
if (write_object)
|
|
ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
|
|
sha1);
|
|
else
|
|
ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
|
|
sha1);
|
|
strbuf_release(&sbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_pipe(unsigned char *sha1, int fd, enum object_type type,
|
|
const char *path, unsigned flags)
|
|
{
|
|
struct strbuf sbuf = STRBUF_INIT;
|
|
int ret;
|
|
|
|
if (strbuf_read(&sbuf, fd, 4096) >= 0)
|
|
ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags);
|
|
else
|
|
ret = -1;
|
|
strbuf_release(&sbuf);
|
|
return ret;
|
|
}
|
|
|
|
#define SMALL_FILE_SIZE (32*1024)
|
|
|
|
static int index_core(unsigned char *sha1, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
if (!size) {
|
|
ret = index_mem(sha1, "", size, type, path, flags);
|
|
} else if (size <= SMALL_FILE_SIZE) {
|
|
char *buf = xmalloc(size);
|
|
if (size == read_in_full(fd, buf, size))
|
|
ret = index_mem(sha1, buf, size, type, path, flags);
|
|
else
|
|
ret = error_errno("short read");
|
|
free(buf);
|
|
} else {
|
|
void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
ret = index_mem(sha1, buf, size, type, path, flags);
|
|
munmap(buf, size);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This creates one packfile per large blob unless bulk-checkin
|
|
* machinery is "plugged".
|
|
*
|
|
* This also bypasses the usual "convert-to-git" dance, and that is on
|
|
* purpose. We could write a streaming version of the converting
|
|
* functions and insert that before feeding the data to fast-import
|
|
* (or equivalent in-core API described above). However, that is
|
|
* somewhat complicated, as we do not know the size of the filter
|
|
* result, which we need to know beforehand when writing a git object.
|
|
* Since the primary motivation for trying to stream from the working
|
|
* tree file and to avoid mmaping it in core is to deal with large
|
|
* binary blobs, they generally do not want to get any conversion, and
|
|
* callers should avoid this code path when filters are requested.
|
|
*/
|
|
static int index_stream(unsigned char *sha1, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
return index_bulk_checkin(sha1, fd, size, type, path, flags);
|
|
}
|
|
|
|
int index_fd(unsigned char *sha1, int fd, struct stat *st,
|
|
enum object_type type, const char *path, unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Call xsize_t() only when needed to avoid potentially unnecessary
|
|
* die() for large files.
|
|
*/
|
|
if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
|
|
ret = index_stream_convert_blob(sha1, fd, path, flags);
|
|
else if (!S_ISREG(st->st_mode))
|
|
ret = index_pipe(sha1, fd, type, path, flags);
|
|
else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
|
|
(path && would_convert_to_git(path)))
|
|
ret = index_core(sha1, fd, xsize_t(st->st_size), type, path,
|
|
flags);
|
|
else
|
|
ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path,
|
|
flags);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags)
|
|
{
|
|
int fd;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
switch (st->st_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return error_errno("open(\"%s\")", path);
|
|
if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0)
|
|
return error("%s: failed to insert into database",
|
|
path);
|
|
break;
|
|
case S_IFLNK:
|
|
if (strbuf_readlink(&sb, path, st->st_size))
|
|
return error_errno("readlink(\"%s\")", path);
|
|
if (!(flags & HASH_WRITE_OBJECT))
|
|
hash_sha1_file(sb.buf, sb.len, blob_type, sha1);
|
|
else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1))
|
|
return error("%s: failed to insert into database",
|
|
path);
|
|
strbuf_release(&sb);
|
|
break;
|
|
case S_IFDIR:
|
|
return resolve_gitlink_ref(path, "HEAD", sha1);
|
|
default:
|
|
return error("%s: unsupported file type", path);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int read_pack_header(int fd, struct pack_header *header)
|
|
{
|
|
if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header))
|
|
/* "eof before pack header was fully read" */
|
|
return PH_ERROR_EOF;
|
|
|
|
if (header->hdr_signature != htonl(PACK_SIGNATURE))
|
|
/* "protocol error (pack signature mismatch detected)" */
|
|
return PH_ERROR_PACK_SIGNATURE;
|
|
if (!pack_version_ok(header->hdr_version))
|
|
/* "protocol error (pack version unsupported)" */
|
|
return PH_ERROR_PROTOCOL;
|
|
return 0;
|
|
}
|
|
|
|
void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
|
|
{
|
|
enum object_type type = sha1_object_info(sha1, NULL);
|
|
if (type < 0)
|
|
die("%s is not a valid object", sha1_to_hex(sha1));
|
|
if (type != expect)
|
|
die("%s is not a valid '%s' object", sha1_to_hex(sha1),
|
|
typename(expect));
|
|
}
|
|
|
|
static int for_each_file_in_obj_subdir(int subdir_nr,
|
|
struct strbuf *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
size_t baselen = path->len;
|
|
DIR *dir = opendir(path->buf);
|
|
struct dirent *de;
|
|
int r = 0;
|
|
|
|
if (!dir) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
return error_errno("unable to open %s", path->buf);
|
|
}
|
|
|
|
while ((de = readdir(dir))) {
|
|
if (is_dot_or_dotdot(de->d_name))
|
|
continue;
|
|
|
|
strbuf_setlen(path, baselen);
|
|
strbuf_addf(path, "/%s", de->d_name);
|
|
|
|
if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) {
|
|
char hex[GIT_SHA1_HEXSZ+1];
|
|
struct object_id oid;
|
|
|
|
snprintf(hex, sizeof(hex), "%02x%s",
|
|
subdir_nr, de->d_name);
|
|
if (!get_oid_hex(hex, &oid)) {
|
|
if (obj_cb) {
|
|
r = obj_cb(&oid, path->buf, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (cruft_cb) {
|
|
r = cruft_cb(de->d_name, path->buf, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
}
|
|
closedir(dir);
|
|
|
|
strbuf_setlen(path, baselen);
|
|
if (!r && subdir_cb)
|
|
r = subdir_cb(subdir_nr, path->buf, data);
|
|
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_file_in_objdir_buf(struct strbuf *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
size_t baselen = path->len;
|
|
int r = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
strbuf_addf(path, "/%02x", i);
|
|
r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
|
|
subdir_cb, data);
|
|
strbuf_setlen(path, baselen);
|
|
if (r)
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_file_in_objdir(const char *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int r;
|
|
|
|
strbuf_addstr(&buf, path);
|
|
r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
|
|
subdir_cb, data);
|
|
strbuf_release(&buf);
|
|
|
|
return r;
|
|
}
|
|
|
|
struct loose_alt_odb_data {
|
|
each_loose_object_fn *cb;
|
|
void *data;
|
|
};
|
|
|
|
static int loose_from_alt_odb(struct alternate_object_database *alt,
|
|
void *vdata)
|
|
{
|
|
struct loose_alt_odb_data *data = vdata;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int r;
|
|
|
|
strbuf_addstr(&buf, alt->path);
|
|
r = for_each_loose_file_in_objdir_buf(&buf,
|
|
data->cb, NULL, NULL,
|
|
data->data);
|
|
strbuf_release(&buf);
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
|
|
{
|
|
struct loose_alt_odb_data alt;
|
|
int r;
|
|
|
|
r = for_each_loose_file_in_objdir(get_object_directory(),
|
|
cb, NULL, NULL, data);
|
|
if (r)
|
|
return r;
|
|
|
|
if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
|
|
return 0;
|
|
|
|
alt.cb = cb;
|
|
alt.data = data;
|
|
return foreach_alt_odb(loose_from_alt_odb, &alt);
|
|
}
|
|
|
|
static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data)
|
|
{
|
|
uint32_t i;
|
|
int r = 0;
|
|
|
|
for (i = 0; i < p->num_objects; i++) {
|
|
struct object_id oid;
|
|
|
|
if (!nth_packed_object_oid(&oid, p, i))
|
|
return error("unable to get sha1 of object %u in %s",
|
|
i, p->pack_name);
|
|
|
|
r = cb(&oid, p, i, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags)
|
|
{
|
|
struct packed_git *p;
|
|
int r = 0;
|
|
int pack_errors = 0;
|
|
|
|
prepare_packed_git();
|
|
for (p = packed_git; p; p = p->next) {
|
|
if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
|
|
continue;
|
|
if (open_pack_index(p)) {
|
|
pack_errors = 1;
|
|
continue;
|
|
}
|
|
r = for_each_object_in_pack(p, cb, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
return r ? r : pack_errors;
|
|
}
|
|
|
|
static int check_stream_sha1(git_zstream *stream,
|
|
const char *hdr,
|
|
unsigned long size,
|
|
const char *path,
|
|
const unsigned char *expected_sha1)
|
|
{
|
|
git_SHA_CTX c;
|
|
unsigned char real_sha1[GIT_SHA1_RAWSZ];
|
|
unsigned char buf[4096];
|
|
unsigned long total_read;
|
|
int status = Z_OK;
|
|
|
|
git_SHA1_Init(&c);
|
|
git_SHA1_Update(&c, hdr, stream->total_out);
|
|
|
|
/*
|
|
* We already read some bytes into hdr, but the ones up to the NUL
|
|
* do not count against the object's content size.
|
|
*/
|
|
total_read = stream->total_out - strlen(hdr) - 1;
|
|
|
|
/*
|
|
* This size comparison must be "<=" to read the final zlib packets;
|
|
* see the comment in unpack_sha1_rest for details.
|
|
*/
|
|
while (total_read <= size &&
|
|
(status == Z_OK || status == Z_BUF_ERROR)) {
|
|
stream->next_out = buf;
|
|
stream->avail_out = sizeof(buf);
|
|
if (size - total_read < stream->avail_out)
|
|
stream->avail_out = size - total_read;
|
|
status = git_inflate(stream, Z_FINISH);
|
|
git_SHA1_Update(&c, buf, stream->next_out - buf);
|
|
total_read += stream->next_out - buf;
|
|
}
|
|
git_inflate_end(stream);
|
|
|
|
if (status != Z_STREAM_END) {
|
|
error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
|
|
return -1;
|
|
}
|
|
if (stream->avail_in) {
|
|
error("garbage at end of loose object '%s'",
|
|
sha1_to_hex(expected_sha1));
|
|
return -1;
|
|
}
|
|
|
|
git_SHA1_Final(real_sha1, &c);
|
|
if (hashcmp(expected_sha1, real_sha1)) {
|
|
error("sha1 mismatch for %s (expected %s)", path,
|
|
sha1_to_hex(expected_sha1));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int read_loose_object(const char *path,
|
|
const unsigned char *expected_sha1,
|
|
enum object_type *type,
|
|
unsigned long *size,
|
|
void **contents)
|
|
{
|
|
int ret = -1;
|
|
int fd = -1;
|
|
void *map = NULL;
|
|
unsigned long mapsize;
|
|
git_zstream stream;
|
|
char hdr[32];
|
|
|
|
*contents = NULL;
|
|
|
|
map = map_sha1_file_1(path, NULL, &mapsize);
|
|
if (!map) {
|
|
error_errno("unable to mmap %s", path);
|
|
goto out;
|
|
}
|
|
|
|
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
|
|
error("unable to unpack header of %s", path);
|
|
goto out;
|
|
}
|
|
|
|
*type = parse_sha1_header(hdr, size);
|
|
if (*type < 0) {
|
|
error("unable to parse header of %s", path);
|
|
git_inflate_end(&stream);
|
|
goto out;
|
|
}
|
|
|
|
if (*type == OBJ_BLOB) {
|
|
if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
|
|
goto out;
|
|
} else {
|
|
*contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
|
|
if (!*contents) {
|
|
error("unable to unpack contents of %s", path);
|
|
git_inflate_end(&stream);
|
|
goto out;
|
|
}
|
|
if (check_sha1_signature(expected_sha1, *contents,
|
|
*size, typename(*type))) {
|
|
error("sha1 mismatch for %s (expected %s)", path,
|
|
sha1_to_hex(expected_sha1));
|
|
free(*contents);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = 0; /* everything checks out */
|
|
|
|
out:
|
|
if (map)
|
|
munmap(map, mapsize);
|
|
if (fd >= 0)
|
|
close(fd);
|
|
return ret;
|
|
}
|