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![Johannes Schindelin](/assets/img/avatar_default.png)
Found by valgrind. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
287 lines
7 KiB
C
287 lines
7 KiB
C
#include "cache.h"
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#include "cache-tree.h"
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#include "tree.h"
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#include "blob.h"
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#include "commit.h"
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#include "tag.h"
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#include "tree-walk.h"
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const char *tree_type = "tree";
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static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
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{
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int len;
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unsigned int size;
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struct cache_entry *ce;
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if (S_ISDIR(mode))
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return READ_TREE_RECURSIVE;
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len = strlen(pathname);
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size = cache_entry_size(baselen + len);
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ce = xcalloc(1, size);
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ce->ce_mode = create_ce_mode(mode);
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ce->ce_flags = create_ce_flags(baselen + len, stage);
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memcpy(ce->name, base, baselen);
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memcpy(ce->name + baselen, pathname, len+1);
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hashcpy(ce->sha1, sha1);
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return add_cache_entry(ce, opt);
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}
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static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
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{
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return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
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ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
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}
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/*
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* This is used when the caller knows there is no existing entries at
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* the stage that will conflict with the entry being added.
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*/
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static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
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{
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return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
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ADD_CACHE_JUST_APPEND);
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}
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static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
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{
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const char *match;
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int pathlen;
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if (!paths)
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return 1;
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pathlen = strlen(path);
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while ((match = *paths++) != NULL) {
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int matchlen = strlen(match);
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if (baselen >= matchlen) {
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/* If it doesn't match, move along... */
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if (strncmp(base, match, matchlen))
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continue;
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/* pathspecs match only at the directory boundaries */
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if (!matchlen ||
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baselen == matchlen ||
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base[matchlen] == '/' ||
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match[matchlen - 1] == '/')
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return 1;
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continue;
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}
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/* Does the base match? */
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if (strncmp(base, match, baselen))
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continue;
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match += baselen;
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matchlen -= baselen;
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if (pathlen > matchlen)
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continue;
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if (matchlen > pathlen) {
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if (match[pathlen] != '/')
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continue;
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if (!S_ISDIR(mode))
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continue;
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}
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if (strncmp(path, match, pathlen))
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continue;
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return 1;
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}
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return 0;
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}
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int read_tree_recursive(struct tree *tree,
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const char *base, int baselen,
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int stage, const char **match,
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read_tree_fn_t fn, void *context)
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{
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struct tree_desc desc;
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struct name_entry entry;
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if (parse_tree(tree))
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return -1;
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init_tree_desc(&desc, tree->buffer, tree->size);
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while (tree_entry(&desc, &entry)) {
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if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
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continue;
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switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage, context)) {
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case 0:
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continue;
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case READ_TREE_RECURSIVE:
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break;
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default:
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return -1;
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}
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if (S_ISDIR(entry.mode)) {
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int retval;
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char *newbase;
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unsigned int pathlen = tree_entry_len(entry.path, entry.sha1);
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newbase = xmalloc(baselen + 1 + pathlen);
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memcpy(newbase, base, baselen);
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memcpy(newbase + baselen, entry.path, pathlen);
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newbase[baselen + pathlen] = '/';
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retval = read_tree_recursive(lookup_tree(entry.sha1),
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newbase,
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baselen + pathlen + 1,
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stage, match, fn, context);
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free(newbase);
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if (retval)
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return -1;
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continue;
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} else if (S_ISGITLINK(entry.mode)) {
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int retval;
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struct strbuf path;
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unsigned int entrylen;
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struct commit *commit;
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entrylen = tree_entry_len(entry.path, entry.sha1);
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strbuf_init(&path, baselen + entrylen + 1);
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strbuf_add(&path, base, baselen);
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strbuf_add(&path, entry.path, entrylen);
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strbuf_addch(&path, '/');
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commit = lookup_commit(entry.sha1);
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if (!commit)
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die("Commit %s in submodule path %s not found",
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sha1_to_hex(entry.sha1), path.buf);
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if (parse_commit(commit))
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die("Invalid commit %s in submodule path %s",
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sha1_to_hex(entry.sha1), path.buf);
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retval = read_tree_recursive(commit->tree,
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path.buf, path.len,
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stage, match, fn, context);
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strbuf_release(&path);
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if (retval)
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return -1;
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continue;
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}
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}
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return 0;
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}
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static int cmp_cache_name_compare(const void *a_, const void *b_)
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{
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const struct cache_entry *ce1, *ce2;
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ce1 = *((const struct cache_entry **)a_);
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ce2 = *((const struct cache_entry **)b_);
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return cache_name_compare(ce1->name, ce1->ce_flags,
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ce2->name, ce2->ce_flags);
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}
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int read_tree(struct tree *tree, int stage, const char **match)
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{
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read_tree_fn_t fn = NULL;
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int i, err;
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/*
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* Currently the only existing callers of this function all
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* call it with stage=1 and after making sure there is nothing
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* at that stage; we could always use read_one_entry_quick().
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*
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* But when we decide to straighten out git-read-tree not to
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* use unpack_trees() in some cases, this will probably start
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* to matter.
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*/
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/*
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* See if we have cache entry at the stage. If so,
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* do it the original slow way, otherwise, append and then
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* sort at the end.
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*/
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for (i = 0; !fn && i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (ce_stage(ce) == stage)
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fn = read_one_entry;
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}
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if (!fn)
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fn = read_one_entry_quick;
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err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
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if (fn == read_one_entry || err)
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return err;
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/*
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* Sort the cache entry -- we need to nuke the cache tree, though.
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*/
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cache_tree_free(&active_cache_tree);
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qsort(active_cache, active_nr, sizeof(active_cache[0]),
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cmp_cache_name_compare);
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return 0;
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}
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struct tree *lookup_tree(const unsigned char *sha1)
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{
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struct object *obj = lookup_object(sha1);
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if (!obj)
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return create_object(sha1, OBJ_TREE, alloc_tree_node());
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if (!obj->type)
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obj->type = OBJ_TREE;
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if (obj->type != OBJ_TREE) {
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error("Object %s is a %s, not a tree",
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sha1_to_hex(sha1), typename(obj->type));
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return NULL;
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}
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return (struct tree *) obj;
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}
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int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
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{
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if (item->object.parsed)
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return 0;
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item->object.parsed = 1;
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item->buffer = buffer;
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item->size = size;
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return 0;
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}
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int parse_tree(struct tree *item)
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{
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enum object_type type;
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void *buffer;
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unsigned long size;
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if (item->object.parsed)
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return 0;
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buffer = read_sha1_file(item->object.sha1, &type, &size);
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if (!buffer)
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return error("Could not read %s",
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sha1_to_hex(item->object.sha1));
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if (type != OBJ_TREE) {
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free(buffer);
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return error("Object %s not a tree",
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sha1_to_hex(item->object.sha1));
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}
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return parse_tree_buffer(item, buffer, size);
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}
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struct tree *parse_tree_indirect(const unsigned char *sha1)
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{
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struct object *obj = parse_object(sha1);
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do {
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if (!obj)
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return NULL;
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if (obj->type == OBJ_TREE)
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return (struct tree *) obj;
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else if (obj->type == OBJ_COMMIT)
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obj = &(((struct commit *) obj)->tree->object);
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else if (obj->type == OBJ_TAG)
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obj = ((struct tag *) obj)->tagged;
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else
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return NULL;
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if (!obj->parsed)
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parse_object(obj->sha1);
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} while (1);
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}
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