static int stage = 0;
-static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode)
-{
- int len = strlen(pathname);
- unsigned int size = cache_entry_size(baselen + len);
- struct cache_entry *ce = malloc(size);
-
- memset(ce, 0, size);
-
- ce->ce_mode = htonl(mode);
- ce->ce_flags = create_ce_flags(baselen + len, stage);
- memcpy(ce->name, base, baselen);
- memcpy(ce->name + baselen, pathname, len+1);
- memcpy(ce->sha1, sha1, 20);
- return add_cache_entry(ce, 1);
-}
-
-static int read_tree(unsigned char *sha1, const char *base, int baselen)
+static int unpack_tree(unsigned char *sha1)
{
void *buffer;
unsigned long size;
- char type[20];
+ int ret;
- buffer = read_sha1_file(sha1, type, &size);
+ buffer = read_object_with_reference(sha1, "tree", &size, NULL);
if (!buffer)
return -1;
- if (strcmp(type, "tree"))
- return -1;
- while (size) {
- int len = strlen(buffer)+1;
- unsigned char *sha1 = buffer + len;
- char *path = strchr(buffer, ' ')+1;
- unsigned int mode;
-
- if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
- return -1;
-
- buffer = sha1 + 20;
- size -= len + 20;
-
- if (S_ISDIR(mode)) {
- int retval;
- int pathlen = strlen(path);
- char *newbase = malloc(baselen + 1 + pathlen);
- memcpy(newbase, base, baselen);
- memcpy(newbase + baselen, path, pathlen);
- newbase[baselen + pathlen] = '/';
- retval = read_tree(sha1, newbase, baselen + pathlen + 1);
- free(newbase);
- if (retval)
- return -1;
- continue;
- }
- if (read_one_entry(sha1, base, baselen, path, mode) < 0)
- return -1;
- }
- return 0;
+ ret = read_tree(buffer, size, stage);
+ free(buffer);
+ return ret;
}
-static int remove_lock = 0;
+static char *lockfile_name;
static void remove_lock_file(void)
{
- if (remove_lock)
- unlink(".git/index.lock");
+ if (lockfile_name)
+ unlink(lockfile_name);
+}
+
+static int path_matches(struct cache_entry *a, struct cache_entry *b)
+{
+ int len = ce_namelen(a);
+ return ce_namelen(b) == len &&
+ !memcmp(a->name, b->name, len);
}
static int same(struct cache_entry *a, struct cache_entry *b)
static void trivially_merge_cache(struct cache_entry **src, int nr)
{
+ static struct cache_entry null_entry;
struct cache_entry **dst = src;
+ struct cache_entry *old = &null_entry;
while (nr) {
struct cache_entry *ce, *result;
ce = src[0];
+
+ /* We throw away original cache entries except for the stat information */
+ if (!ce_stage(ce)) {
+ old = ce;
+ src++;
+ nr--;
+ active_nr--;
+ continue;
+ }
if (nr > 2 && (result = merge_entries(ce, src[1], src[2])) != NULL) {
+ /*
+ * See if we can re-use the old CE directly?
+ * That way we get the uptodate stat info.
+ */
+ if (path_matches(result, old) && same(result, old))
+ *result = *old;
ce = result;
ce->ce_flags &= ~htons(CE_STAGEMASK);
src += 2;
nr -= 2;
active_nr -= 2;
}
- *dst = ce;
+ *dst++ = ce;
src++;
- dst++;
nr--;
}
}
+static void merge_stat_info(struct cache_entry **src, int nr)
+{
+ static struct cache_entry null_entry;
+ struct cache_entry **dst = src;
+ struct cache_entry *old = &null_entry;
+
+ while (nr) {
+ struct cache_entry *ce;
+
+ ce = src[0];
+
+ /* We throw away original cache entries except for the stat information */
+ if (!ce_stage(ce)) {
+ old = ce;
+ src++;
+ nr--;
+ active_nr--;
+ continue;
+ }
+ if (path_matches(ce, old) && same(ce, old))
+ *ce = *old;
+ ce->ce_flags &= ~htons(CE_STAGEMASK);
+ *dst++ = ce;
+ src++;
+ nr--;
+ }
+}
+
+static char *read_tree_usage = "git-read-tree (<sha> | -m <sha1> [<sha2> <sha3>])";
+
int main(int argc, char **argv)
{
- int i, newfd;
+ int i, newfd, merge;
unsigned char sha1[20];
+ static char lockfile[MAXPATHLEN+1];
+ const char *indexfile = get_index_file();
+
+ snprintf(lockfile, sizeof(lockfile), "%s.lock", indexfile);
- newfd = open(".git/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
+ newfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, 0600);
if (newfd < 0)
die("unable to create new cachefile");
atexit(remove_lock_file);
- remove_lock = 1;
+ lockfile_name = lockfile;
+ merge = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
/* "-m" stands for "merge", meaning we start in stage 1 */
if (!strcmp(arg, "-m")) {
+ int i;
+ if (stage)
+ die("-m needs to come first");
+ read_cache();
+ for (i = 0; i < active_nr; i++) {
+ if (ce_stage(active_cache[i]))
+ die("you need to resolve your current index first");
+ }
stage = 1;
+ merge = 1;
continue;
}
- if (get_sha1_hex(arg, sha1) < 0)
- usage("read-tree [-m] <sha1>");
+ if (get_sha1(arg, sha1) < 0)
+ usage(read_tree_usage);
if (stage > 3)
- usage("can't merge more than two trees");
- if (read_tree(sha1, "", 0) < 0)
+ usage(read_tree_usage);
+ if (unpack_tree(sha1) < 0)
die("failed to unpack tree object %s", arg);
stage++;
}
- if (stage == 4)
- trivially_merge_cache(active_cache, active_nr);
- if (write_cache(newfd, active_cache, active_nr) ||
- rename(".git/index.lock", ".git/index"))
+ if (merge) {
+ switch (stage) {
+ case 4: /* Three-way merge */
+ trivially_merge_cache(active_cache, active_nr);
+ break;
+ case 2: /* Just read a tree, merge with old cache contents */
+ merge_stat_info(active_cache, active_nr);
+ break;
+ default:
+ die("just how do you expect me to merge %d trees?", stage-1);
+ }
+ }
+ if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile))
die("unable to write new index file");
- remove_lock = 0;
+ lockfile_name = NULL;
return 0;
}
projects / git.git / blobdiff