[PATCH] fix compare symlink against readlink not data

Fix update-cache to compare the blob of a symlink against the link-target
and not the file it points to. Also ignore all permissions applied to
links.

Thanks to Greg for recognizing this while he added our list of symlinks
back to the udev repository.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff-files.c

@@ -111,7 +111,7 @@ int main(int argc, char **argv)
 			continue;
 		}
  
-		if (stat(ce->name, &st) < 0) {
+		if (lstat(ce->name, &st) < 0) {
 			if (errno != ENOENT) {
 				perror(ce->name);
 				continue;

read-cache.c

@@ -16,6 +16,9 @@ int cache_match_stat(struct cache_entry *ce, struct stat *st)
 	switch (ntohl(ce->ce_mode) & S_IFMT) {
 	case S_IFREG:
 		changed |= !S_ISREG(st->st_mode) ? TYPE_CHANGED : 0;
+		/* We consider only the owner x bit to be relevant for "mode changes" */
+		if (0100 & (ntohl(ce->ce_mode) ^ st->st_mode))
+			changed |= MODE_CHANGED;
 		break;
 	case S_IFLNK:
 		changed |= !S_ISLNK(st->st_mode) ? TYPE_CHANGED : 0;
@@ -43,9 +46,6 @@ int cache_match_stat(struct cache_entry *ce, struct stat *st)
 	if (ce->ce_uid != htonl(st->st_uid) ||
 	    ce->ce_gid != htonl(st->st_gid))
 		changed |= OWNER_CHANGED;
-	/* We consider only the owner x bit to be relevant for "mode changes" */
-	if (0100 & (ntohl(ce->ce_mode) ^ st->st_mode))
-		changed |= MODE_CHANGED;
 	if (ce->ce_dev != htonl(st->st_dev) ||
 	    ce->ce_ino != htonl(st->st_ino))
 		changed |= INODE_CHANGED;

update-cache.c

@@ -64,7 +64,7 @@ static int add_file_to_cache_1(char *path)
 	struct stat st;
 	int fd;
 	unsigned int len;
-	char target[1024];
+	char *target;
 
 	if (lstat(path, &st) < 0) {
 		if (errno == ENOENT || errno == ENOTDIR) {
@@ -90,11 +90,14 @@ static int add_file_to_cache_1(char *path)
 			return -1;
 		break;
 	case S_IFLNK:
-		len = readlink(path, target, sizeof(target));
-		if (len == -1 || len+1 > sizeof(target))
+		target = xmalloc(st.st_size+1);
+		if (readlink(path, target, st.st_size+1) != st.st_size) {
+			free(target);
 			return -1;
-		if (write_sha1_file(target, len, "blob", ce->sha1))
+		}
+		if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
 			return -1;
+		free(target);
 		break;
 	default:
 		return -1;
@@ -163,6 +166,33 @@ static int compare_data(struct cache_entry *ce, unsigned long expected_size)
 	return match;
 }
 
+static int compare_link(struct cache_entry *ce, unsigned long expected_size)
+{
+	int match = -1;
+	char *target;
+	void *buffer;
+	unsigned long size;
+	char type[10];
+	int len;
+
+	target = xmalloc(expected_size);
+	len = readlink(ce->name, target, expected_size);
+	if (len != expected_size) {
+		free(target);
+		return -1;
+	}
+	buffer = read_sha1_file(ce->sha1, type, &size);
+	if (!buffer) {
+		free(target);
+		return -1;
+	}
+	if (size == expected_size)
+		match = memcmp(buffer, target, size);
+	free(buffer);
+	free(target);
+	return match;
+}
+
 /*
  * "refresh" does not calculate a new sha1 file or bring the
  * cache up-to-date for mode/content changes. But what it
@@ -194,8 +224,18 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce)
 	if (changed & (MODE_CHANGED | TYPE_CHANGED))
 		return ERR_PTR(-EINVAL);
 
-	if (compare_data(ce, st.st_size))
+	switch (st.st_mode & S_IFMT) {
+	case S_IFREG:
+		if (compare_data(ce, st.st_size))
+			return ERR_PTR(-EINVAL);
+		break;
+	case S_IFLNK:
+		if (compare_link(ce, st.st_size))
+			return ERR_PTR(-EINVAL);
+		break;
+	default:
 		return ERR_PTR(-EINVAL);
+	}
 
 	cache_changed = 1;
 	size = ce_size(ce);