[git] / fsck.c

#include "cache.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "tree-walk.h"
#include "commit.h"
#include "tag.h"
#include "fsck.h"

static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
{
	struct tree_desc desc;
	struct name_entry entry;
	int res = 0;

	if (parse_tree(tree))
		return -1;

	init_tree_desc(&desc, tree->buffer, tree->size);
	while (tree_entry(&desc, &entry)) {
		int result;

		if (S_ISGITLINK(entry.mode))
			continue;
		if (S_ISDIR(entry.mode))
			result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
		else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
			result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
		else {
			result = error("in tree %s: entry %s has bad mode %.6o",
					sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
		}
		if (result < 0)
			return result;
		if (!res)
			res = result;
	}
	return res;
}

static int fsck_walk_commit(struct commit *commit, fsck_walk_func walk, void *data)
{
	struct commit_list *parents;
	int res;
	int result;

	if (parse_commit(commit))
		return -1;

	result = walk((struct object *)commit->tree, OBJ_TREE, data);
	if (result < 0)
		return result;
	res = result;

	parents = commit->parents;
	while (parents) {
		result = walk((struct object *)parents->item, OBJ_COMMIT, data);
		if (result < 0)
			return result;
		if (!res)
			res = result;
		parents = parents->next;
	}
	return res;
}

static int fsck_walk_tag(struct tag *tag, fsck_walk_func walk, void *data)
{
	if (parse_tag(tag))
		return -1;
	return walk(tag->tagged, OBJ_ANY, data);
}

int fsck_walk(struct object *obj, fsck_walk_func walk, void *data)
{
	if (!obj)
		return -1;
	switch (obj->type) {
	case OBJ_BLOB:
		return 0;
	case OBJ_TREE:
		return fsck_walk_tree((struct tree *)obj, walk, data);
	case OBJ_COMMIT:
		return fsck_walk_commit((struct commit *)obj, walk, data);
	case OBJ_TAG:
		return fsck_walk_tag((struct tag *)obj, walk, data);
	default:
		error("Unknown object type for %s", sha1_to_hex(obj->sha1));
		return -1;
	}
}

/*
 * The entries in a tree are ordered in the _path_ order,
 * which means that a directory entry is ordered by adding
 * a slash to the end of it.
 *
 * So a directory called "a" is ordered _after_ a file
 * called "a.c", because "a/" sorts after "a.c".
 */
#define TREE_UNORDERED (-1)
#define TREE_HAS_DUPS  (-2)

static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
{
	int len1 = strlen(name1);
	int len2 = strlen(name2);
	int len = len1 < len2 ? len1 : len2;
	unsigned char c1, c2;
	int cmp;

	cmp = memcmp(name1, name2, len);
	if (cmp < 0)
		return 0;
	if (cmp > 0)
		return TREE_UNORDERED;

	/*
	 * Ok, the first <len> characters are the same.
	 * Now we need to order the next one, but turn
	 * a '\0' into a '/' for a directory entry.
	 */
	c1 = name1[len];
	c2 = name2[len];
	if (!c1 && !c2)
		/*
		 * git-write-tree used to write out a nonsense tree that has
		 * entries with the same name, one blob and one tree.  Make
		 * sure we do not have duplicate entries.
		 */
		return TREE_HAS_DUPS;
	if (!c1 && S_ISDIR(mode1))
		c1 = '/';
	if (!c2 && S_ISDIR(mode2))
		c2 = '/';
	return c1 < c2 ? 0 : TREE_UNORDERED;
}

static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
{
	int retval;
	int has_null_sha1 = 0;
	int has_full_path = 0;
	int has_empty_name = 0;
	int has_dot = 0;
	int has_dotdot = 0;
	int has_dotgit = 0;
	int has_zero_pad = 0;
	int has_bad_modes = 0;
	int has_dup_entries = 0;
	int not_properly_sorted = 0;
	struct tree_desc desc;
	unsigned o_mode;
	const char *o_name;

	init_tree_desc(&desc, item->buffer, item->size);

	o_mode = 0;
	o_name = NULL;

	while (desc.size) {
		unsigned mode;
		const char *name;
		const unsigned char *sha1;

		sha1 = tree_entry_extract(&desc, &name, &mode);

		if (is_null_sha1(sha1))
			has_null_sha1 = 1;
		if (strchr(name, '/'))
			has_full_path = 1;
		if (!*name)
			has_empty_name = 1;
		if (!strcmp(name, "."))
			has_dot = 1;
		if (!strcmp(name, ".."))
			has_dotdot = 1;
		if (!strcmp(name, ".git"))
			has_dotgit = 1;
		has_zero_pad |= *(char *)desc.buffer == '0';
		update_tree_entry(&desc);

		switch (mode) {
		/*
		 * Standard modes..
		 */
		case S_IFREG | 0755:
		case S_IFREG | 0644:
		case S_IFLNK:
		case S_IFDIR:
		case S_IFGITLINK:
			break;
		/*
		 * This is nonstandard, but we had a few of these
		 * early on when we honored the full set of mode
		 * bits..
		 */
		case S_IFREG | 0664:
			if (!strict)
				break;
		default:
			has_bad_modes = 1;
		}

		if (o_name) {
			switch (verify_ordered(o_mode, o_name, mode, name)) {
			case TREE_UNORDERED:
				not_properly_sorted = 1;
				break;
			case TREE_HAS_DUPS:
				has_dup_entries = 1;
				break;
			default:
				break;
			}
		}

		o_mode = mode;
		o_name = name;
	}

	retval = 0;
	if (has_null_sha1)
		retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
	if (has_full_path)
		retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
	if (has_empty_name)
		retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
	if (has_dot)
		retval += error_func(&item->object, FSCK_WARN, "contains '.'");
	if (has_dotdot)
		retval += error_func(&item->object, FSCK_WARN, "contains '..'");
	if (has_dotgit)
		retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
	if (has_zero_pad)
		retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
	if (has_bad_modes)
		retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
	if (has_dup_entries)
		retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
	if (not_properly_sorted)
		retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
	return retval;
}

static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
{
	if (**ident == '<')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
	*ident += strcspn(*ident, "<>\n");
	if (**ident == '>')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
	if (**ident != '<')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
	if ((*ident)[-1] != ' ')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
	(*ident)++;
	*ident += strcspn(*ident, "<>\n");
	if (**ident != '>')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
	(*ident)++;
	if (**ident != ' ')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
	(*ident)++;
	if (**ident == '0' && (*ident)[1] != ' ')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
	*ident += strspn(*ident, "0123456789");
	if (**ident != ' ')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
	(*ident)++;
	if ((**ident != '+' && **ident != '-') ||
	    !isdigit((*ident)[1]) ||
	    !isdigit((*ident)[2]) ||
	    !isdigit((*ident)[3]) ||
	    !isdigit((*ident)[4]) ||
	    ((*ident)[5] != '\n'))
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
	(*ident) += 6;
	return 0;
}

static int fsck_commit(struct commit *commit, fsck_error error_func)
{
	char *buffer = commit->buffer;
	unsigned char tree_sha1[20], sha1[20];
	struct commit_graft *graft;
	int parents = 0;
	int err;

	if (commit->date == ULONG_MAX)
		return error_func(&commit->object, FSCK_ERROR, "invalid author/committer line");

	if (memcmp(buffer, "tree ", 5))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
	if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
		return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
	buffer += 46;
	while (!memcmp(buffer, "parent ", 7)) {
		if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
			return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
		buffer += 48;
		parents++;
	}
	graft = lookup_commit_graft(commit->object.sha1);
	if (graft) {
		struct commit_list *p = commit->parents;
		parents = 0;
		while (p) {
			p = p->next;
			parents++;
		}
		if (graft->nr_parent == -1 && !parents)
			; /* shallow commit */
		else if (graft->nr_parent != parents)
			return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
	} else {
		struct commit_list *p = commit->parents;
		while (p && parents) {
			p = p->next;
			parents--;
		}
		if (p || parents)
			return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
	}
	if (memcmp(buffer, "author ", 7))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
	buffer += 7;
	err = fsck_ident(&buffer, &commit->object, error_func);
	if (err)
		return err;
	if (memcmp(buffer, "committer ", strlen("committer ")))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
	buffer += strlen("committer ");
	err = fsck_ident(&buffer, &commit->object, error_func);
	if (err)
		return err;
	if (!commit->tree)
		return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));

	return 0;
}

static int fsck_tag(struct tag *tag, fsck_error error_func)
{
	struct object *tagged = tag->tagged;

	if (!tagged)
		return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
	return 0;
}

int fsck_object(struct object *obj, int strict, fsck_error error_func)
{
	if (!obj)
		return error_func(obj, FSCK_ERROR, "no valid object to fsck");

	if (obj->type == OBJ_BLOB)
		return 0;
	if (obj->type == OBJ_TREE)
		return fsck_tree((struct tree *) obj, strict, error_func);
	if (obj->type == OBJ_COMMIT)
		return fsck_commit((struct commit *) obj, error_func);
	if (obj->type == OBJ_TAG)
		return fsck_tag((struct tag *) obj, error_func);

	return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
			  obj->type);
}

int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
{
	va_list ap;
	struct strbuf sb = STRBUF_INIT;

	strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));

	va_start(ap, fmt);
	strbuf_vaddf(&sb, fmt, ap);
	va_end(ap);

	error("%s", sb.buf);
	strbuf_release(&sb);
	return 1;
}
Commit	Line	Data
355885d5 MK	1	#include "cache.h"
	2	#include "object.h"
	3	#include "blob.h"
	4	#include "tree.h"
	5	#include "tree-walk.h"
	6	#include "commit.h"
	7	#include "tag.h"
	8	#include "fsck.h"
	9
	10	static int fsck_walk_tree(struct tree tree, fsck_walk_func walk, void data)
	11	{
	12	struct tree_desc desc;
	13	struct name_entry entry;
	14	int res = 0;
	15
	16	if (parse_tree(tree))
	17	return -1;
	18
	19	init_tree_desc(&desc, tree->buffer, tree->size);
	20	while (tree_entry(&desc, &entry)) {
	21	int result;
	22
	23	if (S_ISGITLINK(entry.mode))
	24	continue;
	25	if (S_ISDIR(entry.mode))
	26	result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
	27	else if (S_ISREG(entry.mode) \|\| S_ISLNK(entry.mode))
	28	result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
	29	else {
82247e9b	30	result = error("in tree %s: entry %s has bad mode %.6o",
355885d5 MK	31	sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
	32	}
	33	if (result < 0)
	34	return result;
	35	if (!res)
	36	res = result;
	37	}
	38	return res;
	39	}
	40
	41	static int fsck_walk_commit(struct commit commit, fsck_walk_func walk, void data)
	42	{
	43	struct commit_list *parents;
	44	int res;
	45	int result;
	46
	47	if (parse_commit(commit))
	48	return -1;
	49
	50	result = walk((struct object *)commit->tree, OBJ_TREE, data);
	51	if (result < 0)
	52	return result;
	53	res = result;
	54
	55	parents = commit->parents;
	56	while (parents) {
	57	result = walk((struct object *)parents->item, OBJ_COMMIT, data);
	58	if (result < 0)
	59	return result;
	60	if (!res)
	61	res = result;
	62	parents = parents->next;
	63	}
	64	return res;
	65	}
	66
	67	static int fsck_walk_tag(struct tag tag, fsck_walk_func walk, void data)
	68	{
	69	if (parse_tag(tag))
	70	return -1;
	71	return walk(tag->tagged, OBJ_ANY, data);
	72	}
	73
	74	int fsck_walk(struct object obj, fsck_walk_func walk, void data)
	75	{
	76	if (!obj)
	77	return -1;
	78	switch (obj->type) {
	79	case OBJ_BLOB:
	80	return 0;
	81	case OBJ_TREE:
	82	return fsck_walk_tree((struct tree *)obj, walk, data);
	83	case OBJ_COMMIT:
	84	return fsck_walk_commit((struct commit *)obj, walk, data);
	85	case OBJ_TAG:
	86	return fsck_walk_tag((struct tag *)obj, walk, data);
	87	default:
	88	error("Unknown object type for %s", sha1_to_hex(obj->sha1));
	89	return -1;
	90	}
	91	}
ba002f3b MK	92
	93	/*
	94	* The entries in a tree are ordered in the _path_ order,
	95	* which means that a directory entry is ordered by adding
	96	* a slash to the end of it.
	97	*
	98	* So a directory called "a" is ordered _after_ a file
	99	* called "a.c", because "a/" sorts after "a.c".
	100	*/
	101	#define TREE_UNORDERED (-1)
	102	#define TREE_HAS_DUPS (-2)
	103
	104	static int verify_ordered(unsigned mode1, const char name1, unsigned mode2, const char name2)
	105	{
	106	int len1 = strlen(name1);
	107	int len2 = strlen(name2);
	108	int len = len1 < len2 ? len1 : len2;
	109	unsigned char c1, c2;
	110	int cmp;
	111
	112	cmp = memcmp(name1, name2, len);
	113	if (cmp < 0)
	114	return 0;
	115	if (cmp > 0)
	116	return TREE_UNORDERED;
	117
	118	/*
	119	* Ok, the first <len> characters are the same.
	120	* Now we need to order the next one, but turn
	121	* a '\0' into a '/' for a directory entry.
	122	*/
	123	c1 = name1[len];
	124	c2 = name2[len];
	125	if (!c1 && !c2)
	126	/*
	127	* git-write-tree used to write out a nonsense tree that has
	128	* entries with the same name, one blob and one tree. Make
	129	* sure we do not have duplicate entries.
	130	*/
	131	return TREE_HAS_DUPS;
	132	if (!c1 && S_ISDIR(mode1))
	133	c1 = '/';
	134	if (!c2 && S_ISDIR(mode2))
	135	c2 = '/';
	136	return c1 < c2 ? 0 : TREE_UNORDERED;
	137	}
	138
	139	static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
	140	{
	141	int retval;
c479d14a	142	int has_null_sha1 = 0;
ba002f3b MK	143	int has_full_path = 0;
ba002f3b MK	144	int has_empty_name = 0;
5d34a435 JK	145	int has_dot = 0;
5d34a435 JK	146	int has_dotdot = 0;
5c17f512	147	int has_dotgit = 0;
ba002f3b MK	148	int has_zero_pad = 0;
	149	int has_bad_modes = 0;
	150	int has_dup_entries = 0;
	151	int not_properly_sorted = 0;
	152	struct tree_desc desc;
	153	unsigned o_mode;
	154	const char *o_name;
ba002f3b MK	155
	156	init_tree_desc(&desc, item->buffer, item->size);
	157
	158	o_mode = 0;
	159	o_name = NULL;
ba002f3b MK	160
	161	while (desc.size) {
	162	unsigned mode;
	163	const char *name;
c479d14a	164	const unsigned char *sha1;
ba002f3b	165
c479d14a	166	sha1 = tree_entry_extract(&desc, &name, &mode);
ba002f3b	167
c479d14a JK	168	if (is_null_sha1(sha1))
c479d14a JK	169	has_null_sha1 = 1;
ba002f3b MK	170	if (strchr(name, '/'))
	171	has_full_path = 1;
	172	if (!*name)
	173	has_empty_name = 1;
5d34a435 JK	174	if (!strcmp(name, "."))
	175	has_dot = 1;
	176	if (!strcmp(name, ".."))
	177	has_dotdot = 1;
5c17f512 JK	178	if (!strcmp(name, ".git"))
5c17f512 JK	179	has_dotgit = 1;
ba002f3b MK	180	has_zero_pad \|= (char )desc.buffer == '0';
	181	update_tree_entry(&desc);
	182
	183	switch (mode) {
	184	/*
	185	* Standard modes..
	186	*/
	187	case S_IFREG \| 0755:
	188	case S_IFREG \| 0644:
	189	case S_IFLNK:
	190	case S_IFDIR:
	191	case S_IFGITLINK:
	192	break;
	193	/*
	194	* This is nonstandard, but we had a few of these
	195	* early on when we honored the full set of mode
	196	* bits..
	197	*/
	198	case S_IFREG \| 0664:
	199	if (!strict)
	200	break;
	201	default:
	202	has_bad_modes = 1;
	203	}
	204
	205	if (o_name) {
	206	switch (verify_ordered(o_mode, o_name, mode, name)) {
	207	case TREE_UNORDERED:
	208	not_properly_sorted = 1;
	209	break;
	210	case TREE_HAS_DUPS:
	211	has_dup_entries = 1;
	212	break;
	213	default:
	214	break;
	215	}
	216	}
	217
	218	o_mode = mode;
	219	o_name = name;
ba002f3b MK	220	}
	221
	222	retval = 0;
c479d14a JK	223	if (has_null_sha1)
c479d14a JK	224	retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
ba002f3b MK	225	if (has_full_path)
	226	retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
	227	if (has_empty_name)
	228	retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
5d34a435 JK	229	if (has_dot)
	230	retval += error_func(&item->object, FSCK_WARN, "contains '.'");
	231	if (has_dotdot)
	232	retval += error_func(&item->object, FSCK_WARN, "contains '..'");
5c17f512 JK	233	if (has_dotgit)
5c17f512 JK	234	retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
ba002f3b MK	235	if (has_zero_pad)
	236	retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
	237	if (has_bad_modes)
	238	retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
	239	if (has_dup_entries)
	240	retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
	241	if (not_properly_sorted)
	242	retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
	243	return retval;
	244	}
	245
daae1922 JN	246	static int fsck_ident(char *ident, struct object obj, fsck_error error_func)
daae1922 JN	247	{
53f53cff	248	if (**ident == '<')
daae1922	249	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
53f53cff DI	250	ident += strcspn(ident, "<>\n");
	251	if (**ident == '>')
	252	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
daae1922 JN	253	if (**ident != '<')
daae1922 JN	254	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
53f53cff DI	255	if ((*ident)[-1] != ' ')
53f53cff DI	256	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
daae1922 JN	257	(*ident)++;
	258	ident += strcspn(ident, "<>\n");
	259	if (**ident != '>')
	260	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
	261	(*ident)++;
	262	if (**ident != ' ')
	263	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
	264	(*ident)++;
	265	if (*ident == '0' && (ident)[1] != ' ')
	266	return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
	267	ident += strspn(ident, "0123456789");
	268	if (**ident != ' ')
	269	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
	270	(*ident)++;
	271	if ((ident != '+' && ident != '-') \|\|
	272	!isdigit((*ident)[1]) \|\|
	273	!isdigit((*ident)[2]) \|\|
	274	!isdigit((*ident)[3]) \|\|
	275	!isdigit((*ident)[4]) \|\|
	276	((*ident)[5] != '\n'))
	277	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
	278	(*ident) += 6;
	279	return 0;
	280	}
	281
ba002f3b MK	282	static int fsck_commit(struct commit *commit, fsck_error error_func)
	283	{
	284	char *buffer = commit->buffer;
	285	unsigned char tree_sha1[20], sha1[20];
	286	struct commit_graft *graft;
	287	int parents = 0;
daae1922	288	int err;
ba002f3b	289
f2909743	290	if (commit->date == ULONG_MAX)
ba002f3b MK	291	return error_func(&commit->object, FSCK_ERROR, "invalid author/committer line");
	292
	293	if (memcmp(buffer, "tree ", 5))
	294	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
	295	if (get_sha1_hex(buffer+5, tree_sha1) \|\| buffer[45] != '\n')
	296	return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
	297	buffer += 46;
	298	while (!memcmp(buffer, "parent ", 7)) {
	299	if (get_sha1_hex(buffer+7, sha1) \|\| buffer[47] != '\n')
	300	return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
	301	buffer += 48;
	302	parents++;
	303	}
	304	graft = lookup_commit_graft(commit->object.sha1);
	305	if (graft) {
	306	struct commit_list *p = commit->parents;
	307	parents = 0;
	308	while (p) {
	309	p = p->next;
	310	parents++;
	311	}
	312	if (graft->nr_parent == -1 && !parents)
	313	; /* shallow commit */
	314	else if (graft->nr_parent != parents)
	315	return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
	316	} else {
	317	struct commit_list *p = commit->parents;
	318	while (p && parents) {
	319	p = p->next;
	320	parents--;
	321	}
	322	if (p \|\| parents)
	323	return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
	324	}
	325	if (memcmp(buffer, "author ", 7))
	326	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
daae1922 JN	327	buffer += 7;
	328	err = fsck_ident(&buffer, &commit->object, error_func);
	329	if (err)
	330	return err;
	331	if (memcmp(buffer, "committer ", strlen("committer ")))
	332	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
	333	buffer += strlen("committer ");
	334	err = fsck_ident(&buffer, &commit->object, error_func);
	335	if (err)
	336	return err;
ba002f3b MK	337	if (!commit->tree)
	338	return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
	339
	340	return 0;
	341	}
	342
	343	static int fsck_tag(struct tag *tag, fsck_error error_func)
	344	{
	345	struct object *tagged = tag->tagged;
	346
	347	if (!tagged)
	348	return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
	349	return 0;
	350	}
	351
	352	int fsck_object(struct object *obj, int strict, fsck_error error_func)
	353	{
	354	if (!obj)
	355	return error_func(obj, FSCK_ERROR, "no valid object to fsck");
	356
	357	if (obj->type == OBJ_BLOB)
	358	return 0;
	359	if (obj->type == OBJ_TREE)
	360	return fsck_tree((struct tree *) obj, strict, error_func);
	361	if (obj->type == OBJ_COMMIT)
	362	return fsck_commit((struct commit *) obj, error_func);
	363	if (obj->type == OBJ_TAG)
	364	return fsck_tag((struct tag *) obj, error_func);
	365
	366	return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
	367	obj->type);
	368	}
d6ffc8d7 MK	369
	370	int fsck_error_function(struct object obj, int type, const char fmt, ...)
	371	{
	372	va_list ap;
f285a2d7	373	struct strbuf sb = STRBUF_INIT;
d6ffc8d7	374
5dd56489	375	strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
d6ffc8d7 MK	376
d6ffc8d7 MK	377	va_start(ap, fmt);
ebeb6090	378	strbuf_vaddf(&sb, fmt, ap);
d6ffc8d7 MK	379	va_end(ap);
d6ffc8d7 MK	380
9db56f71	381	error("%s", sb.buf);
d6ffc8d7 MK	382	strbuf_release(&sb);
	383	return 1;
	384	}