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![Junio C Hamano](/assets/img/avatar_default.png)
More abstraction of hash function from the codepath. * bc/hash-algo: hash: update obsolete reference to SHA1_HEADER bulk-checkin: abstract SHA-1 usage csum-file: abstract uses of SHA-1 csum-file: rename sha1file to hashfile read-cache: abstract away uses of SHA-1 pack-write: switch various SHA-1 values to abstract forms pack-check: convert various uses of SHA-1 to abstract forms fast-import: switch various uses of SHA-1 to the_hash_algo sha1_file: switch uses of SHA-1 to the_hash_algo builtin/unpack-objects: switch uses of SHA-1 to the_hash_algo builtin/index-pack: improve hash function abstraction hash: create union for hash context allocation hash: move SHA-1 macros to hash.h
2236 lines
54 KiB
C
2236 lines
54 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 "config.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 "list.h"
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#include "mergesort.h"
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#include "quote.h"
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#include "packfile.h"
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#include "fetch-object.h"
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const unsigned char null_sha1[GIT_MAX_RAWSZ];
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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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static void git_hash_sha1_init(git_hash_ctx *ctx)
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{
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git_SHA1_Init(&ctx->sha1);
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}
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static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
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{
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git_SHA1_Update(&ctx->sha1, data, len);
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}
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static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
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{
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git_SHA1_Final(hash, &ctx->sha1);
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}
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static void git_hash_unknown_init(git_hash_ctx *ctx)
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{
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die("trying to init unknown hash");
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}
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static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
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{
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die("trying to update unknown hash");
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}
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static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
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{
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die("trying to finalize unknown hash");
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}
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const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
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{
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NULL,
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0x00000000,
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0,
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0,
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git_hash_unknown_init,
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git_hash_unknown_update,
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git_hash_unknown_final,
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NULL,
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NULL,
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},
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{
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"sha-1",
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/* "sha1", big-endian */
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0x73686131,
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GIT_SHA1_RAWSZ,
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GIT_SHA1_HEXSZ,
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git_hash_sha1_init,
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git_hash_sha1_update,
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git_hash_sha1_final,
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&empty_tree_oid,
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&empty_blob_oid,
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},
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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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static int get_conv_flags(unsigned flags)
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{
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if (flags & HASH_RENORMALIZE)
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return CONV_EOL_RENORMALIZE;
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else if (flags & HASH_WRITE_OBJECT)
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return global_conv_flags_eol;
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else
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return 0;
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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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void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
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{
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strbuf_addstr(buf, get_object_directory());
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strbuf_addch(buf, '/');
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fill_sha1_path(buf, sha1);
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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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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 void read_info_alternates(const char * relative_base, int depth);
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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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|
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strbuf_reset(out);
|
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|
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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
|
|
* data for us and set "end". Broken quoting (e.g.,
|
|
* 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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|
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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 sep,
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const char *relative_base, int depth)
|
|
{
|
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struct strbuf objdirbuf = STRBUF_INIT;
|
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struct strbuf entry = STRBUF_INIT;
|
|
|
|
if (!alt || !*alt)
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return;
|
|
|
|
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)
|
|
die("unable to normalize object directory: %s",
|
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objdirbuf.buf);
|
|
|
|
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);
|
|
}
|
|
strbuf_release(&entry);
|
|
strbuf_release(&objdirbuf);
|
|
}
|
|
|
|
static void read_info_alternates(const char * relative_base, int depth)
|
|
{
|
|
char *path;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
path = xstrfmt("%s/info/alternates", relative_base);
|
|
if (strbuf_read_file(&buf, path, 1024) < 0) {
|
|
warn_on_fopen_errors(path);
|
|
free(path);
|
|
return;
|
|
}
|
|
|
|
link_alt_odb_entries(buf.buf, '\n', relative_base, depth);
|
|
strbuf_release(&buf);
|
|
free(path);
|
|
}
|
|
|
|
struct alternate_object_database *alloc_alt_odb(const char *dir)
|
|
{
|
|
struct alternate_object_database *ent;
|
|
|
|
FLEX_ALLOC_STR(ent, path, dir);
|
|
strbuf_init(&ent->scratch, 0);
|
|
strbuf_addf(&ent->scratch, "%s/", dir);
|
|
ent->base_len = ent->scratch.len;
|
|
|
|
return ent;
|
|
}
|
|
|
|
void add_to_alternates_file(const char *reference)
|
|
{
|
|
struct lock_file lock = LOCK_INIT;
|
|
char *alts = git_pathdup("objects/info/alternates");
|
|
FILE *in, *out;
|
|
int found = 0;
|
|
|
|
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");
|
|
|
|
in = fopen(alts, "r");
|
|
if (in) {
|
|
struct strbuf line = STRBUF_INIT;
|
|
|
|
while (strbuf_getline(&line, in) != EOF) {
|
|
if (!strcmp(reference, line.buf)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
fprintf_or_die(out, "%s\n", line.buf);
|
|
}
|
|
|
|
strbuf_release(&line);
|
|
fclose(in);
|
|
}
|
|
else if (errno != ENOENT)
|
|
die_errno("unable to read alternates file");
|
|
|
|
if (found) {
|
|
rollback_lock_file(&lock);
|
|
} else {
|
|
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)
|
|
link_alt_odb_entries(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, '\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_AND_NULL(ref_git);
|
|
}
|
|
|
|
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);
|
|
|
|
alt_odb_tail = &alt_odb_list;
|
|
link_alt_odb_entries(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)
|
|
{
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
strbuf_reset(&buf);
|
|
sha1_file_name(&buf, sha1);
|
|
|
|
return check_and_freshen_file(buf.buf, 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 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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct object_id real_oid;
|
|
enum object_type obj_type;
|
|
struct git_istream *st;
|
|
git_hash_ctx c;
|
|
char hdr[32];
|
|
int hdrlen;
|
|
|
|
if (map) {
|
|
hash_object_file(map, size, type, &real_oid);
|
|
return hashcmp(sha1, real_oid.hash) ? -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.. */
|
|
the_hash_algo->init_fn(&c);
|
|
the_hash_algo->update_fn(&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;
|
|
the_hash_algo->update_fn(&c, buf, readlen);
|
|
}
|
|
the_hash_algo->final_fn(real_oid.hash, &c);
|
|
close_istream(st);
|
|
return hashcmp(sha1, real_oid.hash) ? -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_GETFD) && defined(F_SETFD) && 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_GETFD);
|
|
if (fcntl(fd, F_SETFD, 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;
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
strbuf_reset(&buf);
|
|
sha1_file_name(&buf, sha1);
|
|
*path = buf.buf;
|
|
|
|
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;
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
strbuf_reset(&buf);
|
|
sha1_file_name(&buf, sha1);
|
|
*path = buf.buf;
|
|
|
|
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);
|
|
}
|
|
|
|
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 & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (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, 0);
|
|
}
|
|
|
|
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;
|
|
unsigned long size_scratch;
|
|
|
|
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 && !oi->contentp) {
|
|
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->sizep)
|
|
oi->sizep = &size_scratch;
|
|
|
|
if (oi->disk_sizep)
|
|
*oi->disk_sizep = mapsize;
|
|
if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
|
|
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));
|
|
|
|
if (status >= 0 && oi->contentp) {
|
|
*oi->contentp = unpack_sha1_rest(&stream, hdr,
|
|
*oi->sizep, sha1);
|
|
if (!*oi->contentp) {
|
|
git_inflate_end(&stream);
|
|
status = -1;
|
|
}
|
|
} else
|
|
git_inflate_end(&stream);
|
|
|
|
munmap(map, mapsize);
|
|
if (status && oi->typep)
|
|
*oi->typep = status;
|
|
if (oi->sizep == &size_scratch)
|
|
oi->sizep = NULL;
|
|
strbuf_release(&hdrbuf);
|
|
oi->whence = OI_LOOSE;
|
|
return (status < 0) ? status : 0;
|
|
}
|
|
|
|
int fetch_if_missing = 1;
|
|
|
|
int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
|
|
{
|
|
static struct object_info blank_oi = OBJECT_INFO_INIT;
|
|
struct pack_entry e;
|
|
int rtype;
|
|
const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
|
|
lookup_replace_object(sha1) :
|
|
sha1;
|
|
int already_retried = 0;
|
|
|
|
if (is_null_sha1(real))
|
|
return -1;
|
|
|
|
if (!oi)
|
|
oi = &blank_oi;
|
|
|
|
if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
|
|
struct cached_object *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));
|
|
if (oi->contentp)
|
|
*oi->contentp = xmemdupz(co->buf, co->size);
|
|
oi->whence = OI_CACHED;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
if (find_pack_entry(real, &e))
|
|
break;
|
|
|
|
/* Most likely it's a loose object. */
|
|
if (!sha1_loose_object_info(real, oi, flags))
|
|
return 0;
|
|
|
|
/* Not a loose object; someone else may have just packed it. */
|
|
reprepare_packed_git();
|
|
if (find_pack_entry(real, &e))
|
|
break;
|
|
|
|
/* Check if it is a missing object */
|
|
if (fetch_if_missing && repository_format_partial_clone &&
|
|
!already_retried) {
|
|
/*
|
|
* TODO Investigate haveing fetch_object() return
|
|
* TODO error/success and stopping the music here.
|
|
*/
|
|
fetch_object(repository_format_partial_clone, real);
|
|
already_retried = 1;
|
|
continue;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
if (oi == &blank_oi)
|
|
/*
|
|
* We know that the caller doesn't actually need the
|
|
* information below, so return early.
|
|
*/
|
|
return 0;
|
|
rtype = packed_object_info(e.p, e.offset, oi);
|
|
if (rtype < 0) {
|
|
mark_bad_packed_object(e.p, real);
|
|
return sha1_object_info_extended(real, oi, 0);
|
|
} else if (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);
|
|
}
|
|
|
|
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,
|
|
OBJECT_INFO_LOOKUP_REPLACE) < 0)
|
|
return -1;
|
|
return type;
|
|
}
|
|
|
|
static void *read_object(const unsigned char *sha1, enum object_type *type,
|
|
unsigned long *size)
|
|
{
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
void *content;
|
|
oi.typep = type;
|
|
oi.sizep = size;
|
|
oi.contentp = &content;
|
|
|
|
if (sha1_object_info_extended(sha1, &oi, 0) < 0)
|
|
return NULL;
|
|
return content;
|
|
}
|
|
|
|
int pretend_object_file(void *buf, unsigned long len, enum object_type type,
|
|
struct object_id *oid)
|
|
{
|
|
struct cached_object *co;
|
|
|
|
hash_object_file(buf, len, typename(type), oid);
|
|
if (has_sha1_file(oid->hash) || find_cached_object(oid->hash))
|
|
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, oid->hash);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
int lookup_replace)
|
|
{
|
|
void *data;
|
|
const struct packed_git *p;
|
|
const char *path;
|
|
struct stat st;
|
|
const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
|
|
: sha1;
|
|
|
|
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_object_file_prepare(const void *buf, unsigned long len,
|
|
const char *type, struct object_id *oid,
|
|
char *hdr, int *hdrlen)
|
|
{
|
|
git_hash_ctx c;
|
|
|
|
/* Generate the header */
|
|
*hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
|
|
|
|
/* Sha1.. */
|
|
the_hash_algo->init_fn(&c);
|
|
the_hash_algo->update_fn(&c, hdr, *hdrlen);
|
|
the_hash_algo->update_fn(&c, buf, len);
|
|
the_hash_algo->final_fn(oid->hash, &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_object_file(const void *buf, unsigned long len, const char *type,
|
|
struct object_id *oid)
|
|
{
|
|
char hdr[32];
|
|
int hdrlen = sizeof(hdr);
|
|
write_object_file_prepare(buf, len, type, oid, 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 struct object_id *oid, char *hdr,
|
|
int hdrlen, const void *buf, unsigned long len,
|
|
time_t mtime)
|
|
{
|
|
int fd, ret;
|
|
unsigned char compressed[4096];
|
|
git_zstream stream;
|
|
git_hash_ctx c;
|
|
struct object_id parano_oid;
|
|
static struct strbuf tmp_file = STRBUF_INIT;
|
|
static struct strbuf filename = STRBUF_INIT;
|
|
|
|
strbuf_reset(&filename);
|
|
sha1_file_name(&filename, oid->hash);
|
|
|
|
fd = create_tmpfile(&tmp_file, filename.buf);
|
|
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);
|
|
the_hash_algo->init_fn(&c);
|
|
|
|
/* First header.. */
|
|
stream.next_in = (unsigned char *)hdr;
|
|
stream.avail_in = hdrlen;
|
|
while (git_deflate(&stream, 0) == Z_OK)
|
|
; /* nothing */
|
|
the_hash_algo->update_fn(&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);
|
|
the_hash_algo->update_fn(&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)", oid_to_hex(oid),
|
|
ret);
|
|
ret = git_deflate_end_gently(&stream);
|
|
if (ret != Z_OK)
|
|
die("deflateEnd on object %s failed (%d)", oid_to_hex(oid),
|
|
ret);
|
|
the_hash_algo->final_fn(parano_oid.hash, &c);
|
|
if (oidcmp(oid, ¶no_oid) != 0)
|
|
die("confused by unstable object source data for %s",
|
|
oid_to_hex(oid));
|
|
|
|
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.buf);
|
|
}
|
|
|
|
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_object_file(const void *buf, unsigned long len, const char *type,
|
|
struct object_id *oid)
|
|
{
|
|
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_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
|
|
if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
|
|
return 0;
|
|
return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
|
|
}
|
|
|
|
int hash_object_file_literally(const void *buf, unsigned long len,
|
|
const char *type, struct object_id *oid,
|
|
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_object_file_prepare(buf, len, type, oid, header, &hdrlen);
|
|
|
|
if (!(flags & HASH_WRITE_OBJECT))
|
|
goto cleanup;
|
|
if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
|
|
goto cleanup;
|
|
status = write_loose_object(oid, header, hdrlen, buf, len, 0);
|
|
|
|
cleanup:
|
|
free(header);
|
|
return status;
|
|
}
|
|
|
|
int force_object_loose(const struct object_id *oid, time_t mtime)
|
|
{
|
|
void *buf;
|
|
unsigned long len;
|
|
enum object_type type;
|
|
char hdr[32];
|
|
int hdrlen;
|
|
int ret;
|
|
|
|
if (has_loose_object(oid->hash))
|
|
return 0;
|
|
buf = read_object(oid->hash, &type, &len);
|
|
if (!buf)
|
|
return error("cannot read sha1_file for %s", oid_to_hex(oid));
|
|
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
|
|
ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
|
|
{
|
|
if (!startup_info->have_repository)
|
|
return 0;
|
|
return sha1_object_info_extended(sha1, NULL,
|
|
flags | OBJECT_INFO_SKIP_CACHED) >= 0;
|
|
}
|
|
|
|
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(struct object_id *oid, 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(&the_index, path, buf, size, &nbuf,
|
|
get_conv_flags(flags))) {
|
|
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_object_file(buf, size, typename(type), oid);
|
|
else
|
|
ret = hash_object_file(buf, size, typename(type), oid);
|
|
if (re_allocated)
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_stream_convert_blob(struct object_id *oid, 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(&the_index, path, fd, &sbuf,
|
|
get_conv_flags(flags));
|
|
|
|
if (write_object)
|
|
ret = write_object_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
|
|
oid);
|
|
else
|
|
ret = hash_object_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
|
|
oid);
|
|
strbuf_release(&sbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_pipe(struct object_id *oid, 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(oid, 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(struct object_id *oid, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
if (!size) {
|
|
ret = index_mem(oid, "", size, type, path, flags);
|
|
} else if (size <= SMALL_FILE_SIZE) {
|
|
char *buf = xmalloc(size);
|
|
ssize_t read_result = read_in_full(fd, buf, size);
|
|
if (read_result < 0)
|
|
ret = error_errno("read error while indexing %s",
|
|
path ? path : "<unknown>");
|
|
else if (read_result != size)
|
|
ret = error("short read while indexing %s",
|
|
path ? path : "<unknown>");
|
|
else
|
|
ret = index_mem(oid, buf, size, type, path, flags);
|
|
free(buf);
|
|
} else {
|
|
void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
ret = index_mem(oid, 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(struct object_id *oid, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
return index_bulk_checkin(oid->hash, fd, size, type, path, flags);
|
|
}
|
|
|
|
int index_fd(struct object_id *oid, 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(oid, fd, path, flags);
|
|
else if (!S_ISREG(st->st_mode))
|
|
ret = index_pipe(oid, fd, type, path, flags);
|
|
else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
|
|
(path && would_convert_to_git(&the_index, path)))
|
|
ret = index_core(oid, fd, xsize_t(st->st_size), type, path,
|
|
flags);
|
|
else
|
|
ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
|
|
flags);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags)
|
|
{
|
|
int fd;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int rc = 0;
|
|
|
|
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(oid, 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_object_file(sb.buf, sb.len, blob_type, oid);
|
|
else if (write_object_file(sb.buf, sb.len, blob_type, oid))
|
|
rc = error("%s: failed to insert into database", path);
|
|
strbuf_release(&sb);
|
|
break;
|
|
case S_IFDIR:
|
|
return resolve_gitlink_ref(path, "HEAD", oid);
|
|
default:
|
|
return error("%s: unsupported file type", path);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
int for_each_file_in_obj_subdir(unsigned 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 origlen, baselen;
|
|
DIR *dir;
|
|
struct dirent *de;
|
|
int r = 0;
|
|
struct object_id oid;
|
|
|
|
if (subdir_nr > 0xff)
|
|
BUG("invalid loose object subdirectory: %x", subdir_nr);
|
|
|
|
origlen = path->len;
|
|
strbuf_complete(path, '/');
|
|
strbuf_addf(path, "%02x", subdir_nr);
|
|
|
|
dir = opendir(path->buf);
|
|
if (!dir) {
|
|
if (errno != ENOENT)
|
|
r = error_errno("unable to open %s", path->buf);
|
|
strbuf_setlen(path, origlen);
|
|
return r;
|
|
}
|
|
|
|
oid.hash[0] = subdir_nr;
|
|
strbuf_addch(path, '/');
|
|
baselen = path->len;
|
|
|
|
while ((de = readdir(dir))) {
|
|
size_t namelen;
|
|
if (is_dot_or_dotdot(de->d_name))
|
|
continue;
|
|
|
|
namelen = strlen(de->d_name);
|
|
strbuf_setlen(path, baselen);
|
|
strbuf_add(path, de->d_name, namelen);
|
|
if (namelen == GIT_SHA1_HEXSZ - 2 &&
|
|
!hex_to_bytes(oid.hash + 1, de->d_name,
|
|
GIT_SHA1_RAWSZ - 1)) {
|
|
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 - 1);
|
|
if (!r && subdir_cb)
|
|
r = subdir_cb(subdir_nr, path->buf, data);
|
|
|
|
strbuf_setlen(path, origlen);
|
|
|
|
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)
|
|
{
|
|
int r = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
|
|
subdir_cb, data);
|
|
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 check_stream_sha1(git_zstream *stream,
|
|
const char *hdr,
|
|
unsigned long size,
|
|
const char *path,
|
|
const unsigned char *expected_sha1)
|
|
{
|
|
git_hash_ctx c;
|
|
unsigned char real_sha1[GIT_MAX_RAWSZ];
|
|
unsigned char buf[4096];
|
|
unsigned long total_read;
|
|
int status = Z_OK;
|
|
|
|
the_hash_algo->init_fn(&c);
|
|
the_hash_algo->update_fn(&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);
|
|
the_hash_algo->update_fn(&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;
|
|
}
|
|
|
|
the_hash_algo->final_fn(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;
|
|
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);
|
|
return ret;
|
|
}
|