Merge branch 'jc/fsck'

* jc/fsck:
  fsck: exit with non-zero status upon errors
  unpack_sha1_file(): detect corrupt loose object files.
  fsck: fix broken loose object check.

builtin-fsck.c

@@ -18,6 +18,9 @@ static int check_full;
 static int check_strict;
 static int keep_cache_objects;
 static unsigned char head_sha1[20];
+static int errors_found;
+#define ERROR_OBJECT 01
+#define ERROR_REACHABLE 02
 
 #ifdef NO_D_INO_IN_DIRENT
 #define SORT_DIRENT 0
@@ -40,6 +43,7 @@ static int objerror(struct object *obj, const char *err, ...)
 {
 	va_list params;
 	va_start(params, err);
+	errors_found |= ERROR_OBJECT;
 	objreport(obj, "error", err, params);
 	va_end(params);
 	return -1;
@@ -67,9 +71,10 @@ static void check_reachable_object(struct object *obj)
 	 * do a full fsck
 	 */
 	if (!obj->parsed) {
-		if (has_sha1_file(obj->sha1))
+		if (has_sha1_pack(obj->sha1, NULL))
 			return; /* it is in pack - forget about it */
 		printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
+		errors_found |= ERROR_REACHABLE;
 		return;
 	}
 
@@ -88,6 +93,7 @@ static void check_reachable_object(struct object *obj)
 			       typename(obj->type), sha1_to_hex(obj->sha1));
 			printf("              to %7s %s\n",
 			       typename(ref->type), sha1_to_hex(ref->sha1));
+			errors_found |= ERROR_REACHABLE;
 		}
 	}
 }
@@ -346,8 +352,11 @@ static int fsck_tag(struct tag *tag)
 static int fsck_sha1(unsigned char *sha1)
 {
 	struct object *obj = parse_object(sha1);
-	if (!obj)
-		return error("%s: object corrupt or missing", sha1_to_hex(sha1));
+	if (!obj) {
+		errors_found |= ERROR_OBJECT;
+		return error("%s: object corrupt or missing",
+			     sha1_to_hex(sha1));
+	}
 	if (obj->flags & SEEN)
 		return 0;
 	obj->flags |= SEEN;
@@ -359,8 +368,10 @@ static int fsck_sha1(unsigned char *sha1)
 		return fsck_commit((struct commit *) obj);
 	if (obj->type == OBJ_TAG)
 		return fsck_tag((struct tag *) obj);
+
 	/* By now, parse_object() would've returned NULL instead. */
-	return objerror(obj, "unknown type '%d' (internal fsck error)", obj->type);
+	return objerror(obj, "unknown type '%d' (internal fsck error)",
+			obj->type);
 }
 
 /*
@@ -576,11 +587,16 @@ static int fsck_cache_tree(struct cache_tree *it)
 	return err;
 }
 
+static const char fsck_usage[] =
+"git-fsck [--tags] [--root] [[--unreachable] [--cache] [--full] "
+"[--strict] <head-sha1>*]";
+
 int cmd_fsck(int argc, char **argv, const char *prefix)
 {
 	int i, heads;
 
 	track_object_refs = 1;
+	errors_found = 0;
 
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
@@ -610,7 +626,7 @@ int cmd_fsck(int argc, char **argv, const char *prefix)
 			continue;
 		}
 		if (*arg == '-')
-			usage("git-fsck [--tags] [--root] [[--unreachable] [--cache] [--full] [--strict] <head-sha1>*]");
+			usage(fsck_usage);
 	}
 
 	fsck_head_link();
@@ -690,5 +706,5 @@ int cmd_fsck(int argc, char **argv, const char *prefix)
 	}
 
 	check_connectivity();
-	return 0;
+	return errors_found;
 }

cache.h

@@ -281,7 +281,6 @@ char *enter_repo(char *path, int strict);
 
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 extern int sha1_object_info(const unsigned char *, unsigned long *);
-extern void * unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size);
 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);

sha1_file.c

@@ -967,11 +967,12 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon
 	return 0;
 }
 
-static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
+static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
 {
 	int bytes = strlen(buffer) + 1;
 	unsigned char *buf = xmalloc(1+size);
 	unsigned long n;
+	int status = Z_OK;
 
 	n = stream->total_out - bytes;
 	if (n > size)
@@ -981,12 +982,22 @@ static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size
 	if (bytes < size) {
 		stream->next_out = buf + bytes;
 		stream->avail_out = size - bytes;
-		while (inflate(stream, Z_FINISH) == Z_OK)
-			/* nothing */;
+		while (status == Z_OK)
+			status = inflate(stream, Z_FINISH);
 	}
 	buf[size] = 0;
+	if ((status == Z_OK || status == Z_STREAM_END) && !stream->avail_in) {
 		inflateEnd(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;
 }
 
 /*
@@ -1040,7 +1051,7 @@ static int parse_sha1_header(const char *hdr, unsigned long *sizep)
 	return *hdr ? -1 : type_from_string(type);
 }
 
-void * unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size)
+static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
 {
 	int ret;
 	z_stream stream;
@@ -1050,7 +1061,7 @@ void * unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type
 	if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
 		return NULL;
 
-	return unpack_sha1_rest(&stream, hdr, *size);
+	return unpack_sha1_rest(&stream, hdr, *size, sha1);
 }
 
 static off_t get_delta_base(struct packed_git *p,
@@ -1571,7 +1582,7 @@ void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
 		return buf;
 	map = map_sha1_file(sha1, &mapsize);
 	if (map) {
-		buf = unpack_sha1_file(map, mapsize, type, size);
+		buf = unpack_sha1_file(map, mapsize, type, size, sha1);
 		munmap(map, mapsize);
 		return buf;
 	}