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 = create_ce_mode(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_recursive(void *buffer, const char *type,
- unsigned long size,
- const char *base, int baselen)
-{
- if (!buffer || 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);
- void *eltbuf;
- char elttype[20];
- unsigned long eltsize;
-
- eltbuf = read_sha1_file(sha1, elttype, &eltsize);
- if (!eltbuf)
- return -1;
- memcpy(newbase, base, baselen);
- memcpy(newbase + baselen, path, pathlen);
- newbase[baselen + pathlen] = '/';
- retval = read_tree_recursive(eltbuf, elttype, eltsize,
- newbase,
- baselen + pathlen + 1);
- free(eltbuf);
- free(newbase);
- if (retval)
- return -1;
- continue;
- }
- if (read_one_entry(sha1, base, baselen, path, mode) < 0)
- return -1;
- }
- return 0;
-}
-
-static int read_tree(unsigned char *sha1, const char *base, int baselen)
+static int unpack_tree(unsigned char *sha1)
{
void *buffer;
unsigned long size;
+ int ret;
- buffer = read_tree_with_tree_or_commit_sha1(sha1, &size, 0);
- return read_tree_recursive(buffer, "tree", size, base, baselen);
+ buffer = read_object_with_reference(sha1, "tree", &size, NULL);
+ if (!buffer)
+ return -1;
+ ret = read_tree(buffer, size, stage);
+ free(buffer);
+ return ret;
}
static char *lockfile_name;
return NULL;
}
+/*
+ * When a CE gets turned into an unmerged entry, we
+ * want it to be up-to-date
+ */
+static void verify_uptodate(struct cache_entry *ce)
+{
+ struct stat st;
+
+ if (!lstat(ce->name, &st)) {
+ unsigned changed = ce_match_stat(ce, &st);
+ if (!changed)
+ return;
+ errno = 0;
+ }
+ if (errno == ENOENT)
+ return;
+ die("Entry '%s' not uptodate. Cannot merge.", ce->name);
+}
+
+/*
+ * If the old tree contained a CE that isn't even in the
+ * result, that's always a problem, regardless of whether
+ * it's up-to-date or not (ie it can be a file that we
+ * have updated but not committed yet).
+ */
+static void reject_merge(struct cache_entry *ce)
+{
+ die("Entry '%s' would be overwritten by merge. Cannot merge.", ce->name);
+}
+
+#define CHECK_OLD(ce) if (old && same(old, ce)) { verify_uptodate(old); old = NULL; }
+
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;
+ struct cache_entry *old = NULL;
while (nr) {
struct cache_entry *ce, *result;
/* We throw away original cache entries except for the stat information */
if (!ce_stage(ce)) {
+ if (old)
+ reject_merge(old);
old = ce;
src++;
nr--;
active_nr--;
continue;
}
+ if (old && !path_matches(old, ce))
+ reject_merge(old);
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))
+ if (old && same(old, result)) {
*result = *old;
+ old = NULL;
+ }
+ CHECK_OLD(ce);
+ CHECK_OLD(src[1]);
+ CHECK_OLD(src[2]);
ce = result;
ce->ce_flags &= ~htons(CE_STAGEMASK);
src += 2;
nr -= 2;
active_nr -= 2;
}
+
+ /*
+ * If we had an old entry that we now effectively
+ * overwrite, make sure it wasn't dirty.
+ */
+ CHECK_OLD(ce);
*dst++ = ce;
src++;
nr--;
}
+ if (old)
+ reject_merge(old);
}
static void merge_stat_info(struct cache_entry **src, int nr)
}
}
-static char *read_tree_usage = "read-tree (<sha> | -m <sha1> [<sha2> <sha3>])";
+static char *read_tree_usage = "git-read-tree (<sha> | -m <sha1> [<sha2> <sha3>])";
int main(int argc, char **argv)
{
merge = 1;
continue;
}
- if (get_sha1_hex(arg, sha1) < 0)
+ if (get_sha1(arg, sha1) < 0)
usage(read_tree_usage);
if (stage > 3)
usage(read_tree_usage);
- if (read_tree(sha1, "", 0) < 0)
+ if (unpack_tree(sha1) < 0)
die("failed to unpack tree object %s", arg);
stage++;
}