[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"
#include "refs.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_buffer(struct tag *tag, const char *data,
	unsigned long size, fsck_error error_func)
{
	unsigned char sha1[20];
	int ret = 0;
	const char *buffer;
	char *to_free = NULL, *eol;
	struct strbuf sb = STRBUF_INIT;

	if (data)
		buffer = data;
	else {
		enum object_type type;

		buffer = to_free =
			read_sha1_file(tag->object.sha1, &type, &size);
		if (!buffer)
			return error_func(&tag->object, FSCK_ERROR,
				"cannot read tag object");

		if (type != OBJ_TAG) {
			ret = error_func(&tag->object, FSCK_ERROR,
				"expected tag got %s",
			    typename(type));
			goto done;
		}
	}

	if (require_end_of_header(buffer, size, &tag->object, error_func))
		goto done;

	if (!skip_prefix(buffer, "object ", &buffer)) {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'object' line");
		goto done;
	}
	if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid 'object' line format - bad sha1");
		goto done;
	}
	buffer += 41;

	if (!skip_prefix(buffer, "type ", &buffer)) {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'type' line");
		goto done;
	}
	eol = strchr(buffer, '\n');
	if (!eol) {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
		goto done;
	}
	if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
		ret = error_func(&tag->object, FSCK_ERROR, "invalid 'type' value");
	if (ret)
		goto done;
	buffer = eol + 1;

	if (!skip_prefix(buffer, "tag ", &buffer)) {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'tag' line");
		goto done;
	}
	eol = strchr(buffer, '\n');
	if (!eol) {
		ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
		goto done;
	}
	strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
	if (check_refname_format(sb.buf, 0))
		error_func(&tag->object, FSCK_WARN, "invalid 'tag' name: %s", buffer);
	buffer = eol + 1;

	if (!skip_prefix(buffer, "tagger ", &buffer))
		/* early tags do not contain 'tagger' lines; warn only */
		error_func(&tag->object, FSCK_WARN, "invalid format - expected 'tagger' line");
	else
		ret = fsck_ident(&buffer, &tag->object, error_func);

done:
	strbuf_release(&sb);
	free(to_free);
	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 fsck_tag_buffer(tag, data, size, error_func);
}

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"
cec097be	9	#include "refs.h"
355885d5 MK	10
	11	static int fsck_walk_tree(struct tree tree, fsck_walk_func walk, void data)
	12	{
	13	struct tree_desc desc;
	14	struct name_entry entry;
	15	int res = 0;
	16
	17	if (parse_tree(tree))
	18	return -1;
	19
	20	init_tree_desc(&desc, tree->buffer, tree->size);
	21	while (tree_entry(&desc, &entry)) {
	22	int result;
	23
	24	if (S_ISGITLINK(entry.mode))
	25	continue;
	26	if (S_ISDIR(entry.mode))
	27	result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
	28	else if (S_ISREG(entry.mode) \|\| S_ISLNK(entry.mode))
	29	result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
	30	else {
82247e9b	31	result = error("in tree %s: entry %s has bad mode %.6o",
355885d5 MK	32	sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
	33	}
	34	if (result < 0)
	35	return result;
	36	if (!res)
	37	res = result;
	38	}
	39	return res;
	40	}
	41
	42	static int fsck_walk_commit(struct commit commit, fsck_walk_func walk, void data)
	43	{
	44	struct commit_list *parents;
	45	int res;
	46	int result;
	47
	48	if (parse_commit(commit))
	49	return -1;
	50
	51	result = walk((struct object *)commit->tree, OBJ_TREE, data);
	52	if (result < 0)
	53	return result;
	54	res = result;
	55
	56	parents = commit->parents;
	57	while (parents) {
	58	result = walk((struct object *)parents->item, OBJ_COMMIT, data);
	59	if (result < 0)
	60	return result;
	61	if (!res)
	62	res = result;
	63	parents = parents->next;
	64	}
	65	return res;
	66	}
	67
	68	static int fsck_walk_tag(struct tag tag, fsck_walk_func walk, void data)
	69	{
	70	if (parse_tag(tag))
	71	return -1;
	72	return walk(tag->tagged, OBJ_ANY, data);
	73	}
	74
	75	int fsck_walk(struct object obj, fsck_walk_func walk, void data)
	76	{
	77	if (!obj)
	78	return -1;
	79	switch (obj->type) {
	80	case OBJ_BLOB:
	81	return 0;
	82	case OBJ_TREE:
	83	return fsck_walk_tree((struct tree *)obj, walk, data);
	84	case OBJ_COMMIT:
	85	return fsck_walk_commit((struct commit *)obj, walk, data);
	86	case OBJ_TAG:
	87	return fsck_walk_tag((struct tag *)obj, walk, data);
	88	default:
	89	error("Unknown object type for %s", sha1_to_hex(obj->sha1));
	90	return -1;
	91	}
	92	}
ba002f3b MK	93
	94	/*
	95	* The entries in a tree are ordered in the _path_ order,
	96	* which means that a directory entry is ordered by adding
	97	* a slash to the end of it.
	98	*
	99	* So a directory called "a" is ordered _after_ a file
	100	* called "a.c", because "a/" sorts after "a.c".
	101	*/
	102	#define TREE_UNORDERED (-1)
	103	#define TREE_HAS_DUPS (-2)
	104
	105	static int verify_ordered(unsigned mode1, const char name1, unsigned mode2, const char name2)
	106	{
	107	int len1 = strlen(name1);
	108	int len2 = strlen(name2);
	109	int len = len1 < len2 ? len1 : len2;
	110	unsigned char c1, c2;
	111	int cmp;
	112
	113	cmp = memcmp(name1, name2, len);
	114	if (cmp < 0)
	115	return 0;
	116	if (cmp > 0)
	117	return TREE_UNORDERED;
	118
	119	/*
	120	* Ok, the first <len> characters are the same.
	121	* Now we need to order the next one, but turn
	122	* a '\0' into a '/' for a directory entry.
	123	*/
	124	c1 = name1[len];
	125	c2 = name2[len];
	126	if (!c1 && !c2)
	127	/*
	128	* git-write-tree used to write out a nonsense tree that has
	129	* entries with the same name, one blob and one tree. Make
	130	* sure we do not have duplicate entries.
	131	*/
	132	return TREE_HAS_DUPS;
	133	if (!c1 && S_ISDIR(mode1))
	134	c1 = '/';
	135	if (!c2 && S_ISDIR(mode2))
	136	c2 = '/';
	137	return c1 < c2 ? 0 : TREE_UNORDERED;
	138	}
	139
	140	static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
	141	{
	142	int retval;
c479d14a	143	int has_null_sha1 = 0;
ba002f3b MK	144	int has_full_path = 0;
ba002f3b MK	145	int has_empty_name = 0;
5d34a435 JK	146	int has_dot = 0;
5d34a435 JK	147	int has_dotdot = 0;
5c17f512	148	int has_dotgit = 0;
ba002f3b MK	149	int has_zero_pad = 0;
	150	int has_bad_modes = 0;
	151	int has_dup_entries = 0;
	152	int not_properly_sorted = 0;
	153	struct tree_desc desc;
	154	unsigned o_mode;
	155	const char *o_name;
ba002f3b MK	156
	157	init_tree_desc(&desc, item->buffer, item->size);
	158
	159	o_mode = 0;
	160	o_name = NULL;
ba002f3b MK	161
	162	while (desc.size) {
	163	unsigned mode;
	164	const char *name;
c479d14a	165	const unsigned char *sha1;
ba002f3b	166
c479d14a	167	sha1 = tree_entry_extract(&desc, &name, &mode);
ba002f3b	168
effd12ec HS	169	has_null_sha1 \|= is_null_sha1(sha1);
	170	has_full_path \|= !!strchr(name, '/');
	171	has_empty_name \|= !*name;
	172	has_dot \|= !strcmp(name, ".");
	173	has_dotdot \|= !strcmp(name, "..");
	174	has_dotgit \|= !strcmp(name, ".git");
ba002f3b MK	175	has_zero_pad \|= (char )desc.buffer == '0';
	176	update_tree_entry(&desc);
	177
	178	switch (mode) {
	179	/*
	180	* Standard modes..
	181	*/
	182	case S_IFREG \| 0755:
	183	case S_IFREG \| 0644:
	184	case S_IFLNK:
	185	case S_IFDIR:
	186	case S_IFGITLINK:
	187	break;
	188	/*
	189	* This is nonstandard, but we had a few of these
	190	* early on when we honored the full set of mode
	191	* bits..
	192	*/
	193	case S_IFREG \| 0664:
	194	if (!strict)
	195	break;
	196	default:
	197	has_bad_modes = 1;
	198	}
	199
	200	if (o_name) {
	201	switch (verify_ordered(o_mode, o_name, mode, name)) {
	202	case TREE_UNORDERED:
	203	not_properly_sorted = 1;
	204	break;
	205	case TREE_HAS_DUPS:
	206	has_dup_entries = 1;
	207	break;
	208	default:
	209	break;
	210	}
	211	}
	212
	213	o_mode = mode;
	214	o_name = name;
ba002f3b MK	215	}
	216
	217	retval = 0;
c479d14a JK	218	if (has_null_sha1)
c479d14a JK	219	retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
ba002f3b MK	220	if (has_full_path)
	221	retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
	222	if (has_empty_name)
	223	retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
5d34a435 JK	224	if (has_dot)
	225	retval += error_func(&item->object, FSCK_WARN, "contains '.'");
	226	if (has_dotdot)
	227	retval += error_func(&item->object, FSCK_WARN, "contains '..'");
5c17f512 JK	228	if (has_dotgit)
5c17f512 JK	229	retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
ba002f3b MK	230	if (has_zero_pad)
	231	retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
	232	if (has_bad_modes)
	233	retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
	234	if (has_dup_entries)
	235	retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
	236	if (not_properly_sorted)
	237	retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
	238	return retval;
	239	}
	240
4d0d8975 JS	241	static int require_end_of_header(const void *data, unsigned long size,
	242	struct object *obj, fsck_error error_func)
	243	{
	244	const char buffer = (const char )data;
	245	unsigned long i;
	246
	247	for (i = 0; i < size; i++) {
	248	switch (buffer[i]) {
	249	case '\0':
	250	return error_func(obj, FSCK_ERROR,
	251	"unterminated header: NUL at offset %d", i);
	252	case '\n':
	253	if (i + 1 < size && buffer[i + 1] == '\n')
	254	return 0;
	255	}
	256	}
	257
	258	return error_func(obj, FSCK_ERROR, "unterminated header");
	259	}
	260
de42180f	261	static int fsck_ident(const char *ident, struct object obj, fsck_error error_func)
daae1922	262	{
d4b8de04 JK	263	char *end;
d4b8de04 JK	264
53f53cff	265	if (**ident == '<')
daae1922	266	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
53f53cff DI	267	ident += strcspn(ident, "<>\n");
	268	if (**ident == '>')
	269	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
daae1922 JN	270	if (**ident != '<')
daae1922 JN	271	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
53f53cff DI	272	if ((*ident)[-1] != ' ')
53f53cff DI	273	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
daae1922 JN	274	(*ident)++;
	275	ident += strcspn(ident, "<>\n");
	276	if (**ident != '>')
	277	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
	278	(*ident)++;
	279	if (**ident != ' ')
	280	return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
	281	(*ident)++;
	282	if (*ident == '0' && (ident)[1] != ' ')
	283	return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
7ca36d93	284	if (date_overflows(strtoul(*ident, &end, 10)))
d4b8de04 JK	285	return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
d4b8de04 JK	286	if (end == ident \|\| end != ' ')
daae1922	287	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
d4b8de04	288	*ident = end + 1;
daae1922 JN	289	if ((ident != '+' && ident != '-') \|\|
	290	!isdigit((*ident)[1]) \|\|
	291	!isdigit((*ident)[2]) \|\|
	292	!isdigit((*ident)[3]) \|\|
	293	!isdigit((*ident)[4]) \|\|
	294	((*ident)[5] != '\n'))
	295	return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
	296	(*ident) += 6;
	297	return 0;
	298	}
	299
bc6b8fc1	300	static int fsck_commit_buffer(struct commit commit, const char buffer,
90a398bb	301	unsigned long size, fsck_error error_func)
ba002f3b	302	{
ba002f3b MK	303	unsigned char tree_sha1[20], sha1[20];
ba002f3b MK	304	struct commit_graft *graft;
9d02150c	305	unsigned parent_count, parent_line_count = 0;
daae1922	306	int err;
ba002f3b	307
4d0d8975 JS	308	if (require_end_of_header(buffer, size, &commit->object, error_func))
	309	return -1;
	310
cf4fff57	311	if (!skip_prefix(buffer, "tree ", &buffer))
ba002f3b	312	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
2d820a61	313	if (get_sha1_hex(buffer, tree_sha1) \|\| buffer[40] != '\n')
ba002f3b	314	return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
2d820a61	315	buffer += 41;
cf4fff57	316	while (skip_prefix(buffer, "parent ", &buffer)) {
2d820a61	317	if (get_sha1_hex(buffer, sha1) \|\| buffer[40] != '\n')
ba002f3b	318	return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
2d820a61	319	buffer += 41;
9d02150c	320	parent_line_count++;
ba002f3b MK	321	}
ba002f3b MK	322	graft = lookup_commit_graft(commit->object.sha1);
9d02150c	323	parent_count = commit_list_count(commit->parents);
ba002f3b	324	if (graft) {
9d02150c	325	if (graft->nr_parent == -1 && !parent_count)
ba002f3b	326	; /* shallow commit */
9d02150c	327	else if (graft->nr_parent != parent_count)
ba002f3b MK	328	return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
ba002f3b MK	329	} else {
9d02150c	330	if (parent_count != parent_line_count)
ba002f3b MK	331	return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
ba002f3b MK	332	}
cf4fff57	333	if (!skip_prefix(buffer, "author ", &buffer))
ba002f3b	334	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
daae1922 JN	335	err = fsck_ident(&buffer, &commit->object, error_func);
	336	if (err)
	337	return err;
cf4fff57	338	if (!skip_prefix(buffer, "committer ", &buffer))
daae1922	339	return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
daae1922 JN	340	err = fsck_ident(&buffer, &commit->object, error_func);
	341	if (err)
	342	return err;
ba002f3b MK	343	if (!commit->tree)
	344	return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
	345
	346	return 0;
	347	}
	348
90a398bb JS	349	static int fsck_commit(struct commit commit, const char data,
90a398bb JS	350	unsigned long size, fsck_error error_func)
bc6b8fc1	351	{
90a398bb JS	352	const char *buffer = data ? data : get_commit_buffer(commit, &size);
	353	int ret = fsck_commit_buffer(commit, buffer, size, error_func);
	354	if (!data)
	355	unuse_commit_buffer(commit, buffer);
bc6b8fc1 JK	356	return ret;
	357	}
	358
cec097be JS	359	static int fsck_tag_buffer(struct tag tag, const char data,
	360	unsigned long size, fsck_error error_func)
	361	{
	362	unsigned char sha1[20];
	363	int ret = 0;
	364	const char *buffer;
	365	char to_free = NULL, eol;
	366	struct strbuf sb = STRBUF_INIT;
	367
	368	if (data)
	369	buffer = data;
	370	else {
	371	enum object_type type;
	372
	373	buffer = to_free =
	374	read_sha1_file(tag->object.sha1, &type, &size);
	375	if (!buffer)
	376	return error_func(&tag->object, FSCK_ERROR,
	377	"cannot read tag object");
	378
	379	if (type != OBJ_TAG) {
	380	ret = error_func(&tag->object, FSCK_ERROR,
	381	"expected tag got %s",
	382	typename(type));
	383	goto done;
	384	}
	385	}
	386
	387	if (require_end_of_header(buffer, size, &tag->object, error_func))
	388	goto done;
	389
	390	if (!skip_prefix(buffer, "object ", &buffer)) {
	391	ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'object' line");
	392	goto done;
	393	}
	394	if (get_sha1_hex(buffer, sha1) \|\| buffer[40] != '\n') {
	395	ret = error_func(&tag->object, FSCK_ERROR, "invalid 'object' line format - bad sha1");
	396	goto done;
	397	}
	398	buffer += 41;
	399
	400	if (!skip_prefix(buffer, "type ", &buffer)) {
	401	ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'type' line");
	402	goto done;
	403	}
	404	eol = strchr(buffer, '\n');
	405	if (!eol) {
	406	ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
	407	goto done;
	408	}
	409	if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
	410	ret = error_func(&tag->object, FSCK_ERROR, "invalid 'type' value");
	411	if (ret)
	412	goto done;
	413	buffer = eol + 1;
	414
	415	if (!skip_prefix(buffer, "tag ", &buffer)) {
	416	ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'tag' line");
	417	goto done;
	418	}
	419	eol = strchr(buffer, '\n');
	420	if (!eol) {
	421	ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
	422	goto done;
423	}
424	strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
425	if (check_refname_format(sb.buf, 0))
426	error_func(&tag->object, FSCK_WARN, "invalid 'tag' name: %s", buffer);
427	buffer = eol + 1;
428
429	if (!skip_prefix(buffer, "tagger ", &buffer))
430	/* early tags do not contain 'tagger' lines; warn only */
431	error_func(&tag->object, FSCK_WARN, "invalid format - expected 'tagger' line");
432	else
433	ret = fsck_ident(&buffer, &tag->object, error_func);
434
435	done:
436	strbuf_release(&sb);
437	free(to_free);
438	return ret;
439	}
440
90a398bb JS	441	static int fsck_tag(struct tag tag, const char data,
90a398bb JS	442	unsigned long size, fsck_error error_func)
ba002f3b MK	443	{
	444	struct object *tagged = tag->tagged;
	445
	446	if (!tagged)
	447	return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
cec097be JS	448
cec097be JS	449	return fsck_tag_buffer(tag, data, size, error_func);
ba002f3b MK	450	}
ba002f3b MK	451
90a398bb JS	452	int fsck_object(struct object obj, void data, unsigned long size,
90a398bb JS	453	int strict, fsck_error error_func)
ba002f3b MK	454	{
	455	if (!obj)
	456	return error_func(obj, FSCK_ERROR, "no valid object to fsck");
	457
	458	if (obj->type == OBJ_BLOB)
	459	return 0;
	460	if (obj->type == OBJ_TREE)
	461	return fsck_tree((struct tree *) obj, strict, error_func);
	462	if (obj->type == OBJ_COMMIT)
90a398bb JS	463	return fsck_commit((struct commit ) obj, (const char ) data,
90a398bb JS	464	size, error_func);
ba002f3b	465	if (obj->type == OBJ_TAG)
90a398bb JS	466	return fsck_tag((struct tag ) obj, (const char ) data,
90a398bb JS	467	size, error_func);
ba002f3b MK	468
	469	return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
	470	obj->type);
	471	}
d6ffc8d7 MK	472
	473	int fsck_error_function(struct object obj, int type, const char fmt, ...)
	474	{
	475	va_list ap;
f285a2d7	476	struct strbuf sb = STRBUF_INIT;
d6ffc8d7	477
5dd56489	478	strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
d6ffc8d7 MK	479
d6ffc8d7 MK	480	va_start(ap, fmt);
ebeb6090	481	strbuf_vaddf(&sb, fmt, ap);
d6ffc8d7 MK	482	va_end(ap);
d6ffc8d7 MK	483
9db56f71	484	error("%s", sb.buf);
d6ffc8d7 MK	485	strbuf_release(&sb);
	486	return 1;
	487	}