[thirdparty/git.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);

		has_null_sha1 |= is_null_sha1(sha1);
		has_full_path |= !!strchr(name, '/');
		has_empty_name |= !*name;
		has_dot |= !strcmp(name, ".");
		has_dotdot |= !strcmp(name, "..");
		has_dotgit |= !strcmp(name, ".git");
		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 require_end_of_header(const void *data, unsigned long size,
	struct object *obj, fsck_error error_func)
{
	const char *buffer = (const char *)data;
	unsigned long i;

	for (i = 0; i < size; i++) {
		switch (buffer[i]) {
		case '\0':
			return error_func(obj, FSCK_ERROR,
				"unterminated header: NUL at offset %d", i);
		case '\n':
			if (i + 1 < size && buffer[i + 1] == '\n')
				return 0;
		}
	}

	return error_func(obj, FSCK_ERROR, "unterminated header");
}

static int fsck_ident(const char **ident, struct object *obj, fsck_error error_func)
{
	char *end;

	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");
	if (date_overflows(strtoul(*ident, &end, 10)))
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
	if (end == *ident || *end != ' ')
		return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
	*ident = end + 1;
	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_buffer(struct commit *commit, const char *buffer,
	unsigned long size, fsck_error error_func)
{
	unsigned char tree_sha1[20], sha1[20];
	struct commit_graft *graft;
	unsigned parent_count, parent_line_count = 0;
	int err;

	if (require_end_of_header(buffer, size, &commit->object, error_func))
		return -1;

	if (!skip_prefix(buffer, "tree ", &buffer))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
	if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
		return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
	buffer += 41;
	while (skip_prefix(buffer, "parent ", &buffer)) {
		if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
			return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
		buffer += 41;
		parent_line_count++;
	}
	graft = lookup_commit_graft(commit->object.sha1);
	parent_count = commit_list_count(commit->parents);
	if (graft) {
		if (graft->nr_parent == -1 && !parent_count)
			; /* shallow commit */
		else if (graft->nr_parent != parent_count)
			return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
	} else {
		if (parent_count != parent_line_count)
			return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
	}
	if (!skip_prefix(buffer, "author ", &buffer))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
	err = fsck_ident(&buffer, &commit->object, error_func);
	if (err)
		return err;
	if (!skip_prefix(buffer, "committer ", &buffer))
		return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
	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_commit(struct commit *commit, const char *data,
	unsigned long size, fsck_error error_func)
{
	const char *buffer = data ?  data : get_commit_buffer(commit, &size);
	int ret = fsck_commit_buffer(commit, buffer, size, error_func);
	if (!data)
		unuse_commit_buffer(commit, buffer);
	return ret;
}

static int fsck_tag(struct tag *tag, const char *data,
	unsigned long size, 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, void *data, unsigned long size,
	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, (const char *) data,
			size, error_func);
	if (obj->type == OBJ_TAG)
		return fsck_tag((struct tag *) obj, (const char *) data,
			size, 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
effd12ec HS	168	has_null_sha1 \|= is_null_sha1(sha1);
	169	has_full_path \|= !!strchr(name, '/');
	170	has_empty_name \|= !*name;
	171	has_dot \|= !strcmp(name, ".");
	172	has_dotdot \|= !strcmp(name, "..");
	173	has_dotgit \|= !strcmp(name, ".git");
ba002f3b MK	174	has_zero_pad \|= (char )desc.buffer == '0';
	175	update_tree_entry(&desc);
	176
	177	switch (mode) {
	178	/*
	179	* Standard modes..
	180	*/
	181	case S_IFREG \| 0755:
	182	case S_IFREG \| 0644:
	183	case S_IFLNK:
	184	case S_IFDIR:
	185	case S_IFGITLINK:
	186	break;
	187	/*
	188	* This is nonstandard, but we had a few of these
	189	* early on when we honored the full set of mode
	190	* bits..
	191	*/
	192	case S_IFREG \| 0664:
	193	if (!strict)
	194	break;
	195	default:
	196	has_bad_modes = 1;
	197	}
	198
	199	if (o_name) {
	200	switch (verify_ordered(o_mode, o_name, mode, name)) {
	201	case TREE_UNORDERED:
	202	not_properly_sorted = 1;
	203	break;
	204	case TREE_HAS_DUPS:
	205	has_dup_entries = 1;
	206	break;
	207	default:
	208	break;
	209	}
	210	}
	211
	212	o_mode = mode;
	213	o_name = name;
ba002f3b MK	214	}
	215
	216	retval = 0;
c479d14a JK	217	if (has_null_sha1)
c479d14a JK	218	retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
ba002f3b MK	219	if (has_full_path)
	220	retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
	221	if (has_empty_name)
	222	retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
5d34a435 JK	223	if (has_dot)
	224	retval += error_func(&item->object, FSCK_WARN, "contains '.'");
	225	if (has_dotdot)
	226	retval += error_func(&item->object, FSCK_WARN, "contains '..'");
5c17f512 JK	227	if (has_dotgit)
5c17f512 JK	228	retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
ba002f3b MK	229	if (has_zero_pad)
	230	retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
	231	if (has_bad_modes)
	232	retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
	233	if (has_dup_entries)
	234	retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
	235	if (not_properly_sorted)
	236	retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
	237	return retval;
	238	}
	239
4d0d8975 JS	240	static int require_end_of_header(const void *data, unsigned long size,
	241	struct object *obj, fsck_error error_func)
	242	{
	243	const char buffer = (const char )data;
	244	unsigned long i;
	245
	246	for (i = 0; i < size; i++) {
	247	switch (buffer[i]) {
	248	case '\0':
	249	return error_func(obj, FSCK_ERROR,
	250	"unterminated header: NUL at offset %d", i);
	251	case '\n':
	252	if (i + 1 < size && buffer[i + 1] == '\n')
	253	return 0;
	254	}
	255	}
	256
	257	return error_func(obj, FSCK_ERROR, "unterminated header");
	258	}
	259
de42180f	260	static int fsck_ident(const char *ident, struct object obj, fsck_error error_func)
daae1922	261	{
d4b8de04 JK	262	char *end;
d4b8de04 JK	263
53f53cff	264	if (**ident == '<')
daae1922	265	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
53f53cff DI	266	ident += strcspn(ident, "<>\n");
	267	if (**ident == '>')
	268	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
daae1922 JN	269	if (**ident != '<')
daae1922 JN	270	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
53f53cff DI	271	if ((*ident)[-1] != ' ')
53f53cff DI	272	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
daae1922 JN	273	(*ident)++;
	274	ident += strcspn(ident, "<>\n");
	275	if (**ident != '>')
	276	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
	277	(*ident)++;
	278	if (**ident != ' ')
	279	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
	280	(*ident)++;
	281	if (*ident == '0' && (ident)[1] != ' ')
	282	return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
7ca36d93	283	if (date_overflows(strtoul(*ident, &end, 10)))
d4b8de04 JK	284	return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
d4b8de04 JK	285	if (end == ident \|\| end != ' ')
daae1922	286	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
d4b8de04	287	*ident = end + 1;
daae1922 JN	288	if ((ident != '+' && ident != '-') \|\|
	289	!isdigit((*ident)[1]) \|\|
	290	!isdigit((*ident)[2]) \|\|
	291	!isdigit((*ident)[3]) \|\|
	292	!isdigit((*ident)[4]) \|\|
	293	((*ident)[5] != '\n'))
	294	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
	295	(*ident) += 6;
	296	return 0;
	297	}
	298
bc6b8fc1	299	static int fsck_commit_buffer(struct commit commit, const char buffer,
90a398bb	300	unsigned long size, fsck_error error_func)
ba002f3b	301	{
ba002f3b MK	302	unsigned char tree_sha1[20], sha1[20];
ba002f3b MK	303	struct commit_graft *graft;
9d02150c	304	unsigned parent_count, parent_line_count = 0;
daae1922	305	int err;
ba002f3b	306
4d0d8975 JS	307	if (require_end_of_header(buffer, size, &commit->object, error_func))
	308	return -1;
	309
cf4fff57	310	if (!skip_prefix(buffer, "tree ", &buffer))
ba002f3b	311	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
2d820a61	312	if (get_sha1_hex(buffer, tree_sha1) \|\| buffer[40] != '\n')
ba002f3b	313	return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
2d820a61	314	buffer += 41;
cf4fff57	315	while (skip_prefix(buffer, "parent ", &buffer)) {
2d820a61	316	if (get_sha1_hex(buffer, sha1) \|\| buffer[40] != '\n')
ba002f3b	317	return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
2d820a61	318	buffer += 41;
9d02150c	319	parent_line_count++;
ba002f3b MK	320	}
ba002f3b MK	321	graft = lookup_commit_graft(commit->object.sha1);
9d02150c	322	parent_count = commit_list_count(commit->parents);
ba002f3b	323	if (graft) {
9d02150c	324	if (graft->nr_parent == -1 && !parent_count)
ba002f3b	325	; /* shallow commit */
9d02150c	326	else if (graft->nr_parent != parent_count)
ba002f3b MK	327	return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
ba002f3b MK	328	} else {
9d02150c	329	if (parent_count != parent_line_count)
ba002f3b MK	330	return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
ba002f3b MK	331	}
cf4fff57	332	if (!skip_prefix(buffer, "author ", &buffer))
ba002f3b	333	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
daae1922 JN	334	err = fsck_ident(&buffer, &commit->object, error_func);
	335	if (err)
	336	return err;
cf4fff57	337	if (!skip_prefix(buffer, "committer ", &buffer))
daae1922	338	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
daae1922 JN	339	err = fsck_ident(&buffer, &commit->object, error_func);
	340	if (err)
	341	return err;
ba002f3b MK	342	if (!commit->tree)
	343	return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
	344
	345	return 0;
	346	}
	347
90a398bb JS	348	static int fsck_commit(struct commit commit, const char data,
90a398bb JS	349	unsigned long size, fsck_error error_func)
bc6b8fc1	350	{
90a398bb JS	351	const char *buffer = data ? data : get_commit_buffer(commit, &size);
	352	int ret = fsck_commit_buffer(commit, buffer, size, error_func);
	353	if (!data)
	354	unuse_commit_buffer(commit, buffer);
bc6b8fc1 JK	355	return ret;
	356	}
	357
90a398bb JS	358	static int fsck_tag(struct tag tag, const char data,
90a398bb JS	359	unsigned long size, fsck_error error_func)
ba002f3b MK	360	{
	361	struct object *tagged = tag->tagged;
	362
	363	if (!tagged)
	364	return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
	365	return 0;
	366	}
	367
90a398bb JS	368	int fsck_object(struct object obj, void data, unsigned long size,
90a398bb JS	369	int strict, fsck_error error_func)
ba002f3b MK	370	{
	371	if (!obj)
	372	return error_func(obj, FSCK_ERROR, "no valid object to fsck");
	373
	374	if (obj->type == OBJ_BLOB)
	375	return 0;
	376	if (obj->type == OBJ_TREE)
	377	return fsck_tree((struct tree *) obj, strict, error_func);
	378	if (obj->type == OBJ_COMMIT)
90a398bb JS	379	return fsck_commit((struct commit ) obj, (const char ) data,
90a398bb JS	380	size, error_func);
ba002f3b	381	if (obj->type == OBJ_TAG)
90a398bb JS	382	return fsck_tag((struct tag ) obj, (const char ) data,
90a398bb JS	383	size, error_func);
ba002f3b MK	384
	385	return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
	386	obj->type);
	387	}
d6ffc8d7 MK	388
	389	int fsck_error_function(struct object obj, int type, const char fmt, ...)
	390	{
	391	va_list ap;
f285a2d7	392	struct strbuf sb = STRBUF_INIT;
d6ffc8d7	393
5dd56489	394	strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
d6ffc8d7 MK	395
d6ffc8d7 MK	396	va_start(ap, fmt);
ebeb6090	397	strbuf_vaddf(&sb, fmt, ap);
d6ffc8d7 MK	398	va_end(ap);
d6ffc8d7 MK	399
9db56f71	400	error("%s", sb.buf);
d6ffc8d7 MK	401	strbuf_release(&sb);
	402	return 1;
	403	}