Commit message: fsck: detect submodule urls starting with dash

Urls with leading dashes can cause mischief on older
versions of Git. We should detect them so that they can be
rejected by receive.fsckObjects, preventing modern versions
of git from being a vector by which attacks can spread.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
CVE: CVE-2018-17456
CWE: CWE-20
Vulnerability description: Git before 2.14.5, 2.15.x before 2.15.3, 2.16.x before 2.16.5, 2.17.x before 2.17.2, 2.18.x before 2.18.1, and 2.19.x before 2.19.1 allows remote code execution during processing of a recursive "git clone" of a superproject if a .gitmodules file has a URL field beginning with a '-' character.

Project: git

static void append_msg_id(struct strbuf *sb, const char *msg_id)
{
	for (;;) {
		char c = *(msg_id)++;

		if (!c)
			break;
		if (c != '_')
			strbuf_addch(sb, tolower(c));
		else {
			assert(*msg_id);
			strbuf_addch(sb, *(msg_id)++);
		}
	}

	strbuf_addstr(sb, ": ");
}

Project: git

static const char *describe_object(struct fsck_options *o, struct object *obj)
{
	static struct strbuf buf = STRBUF_INIT;
	char *name;

	strbuf_reset(&buf);
	strbuf_addstr(&buf, oid_to_hex(&obj->oid));
	if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
		strbuf_addf(&buf, " (%s)", name);

	return buf.buf;
}

Project: git

static int fsck_commit(struct commit *commit, const char *data,
	unsigned long size, struct fsck_options *options)
{
	const char *buffer = data ?  data : get_commit_buffer(commit, &size);
	int ret = fsck_commit_buffer(commit, buffer, size, options);
	if (!data)
		unuse_commit_buffer(commit, buffer);
	return ret;
}

Project: git

static int fsck_commit_buffer(struct commit *commit, const char *buffer,
	unsigned long size, struct fsck_options *options)
{
	unsigned char tree_sha1[20], sha1[20];
	struct commit_graft *graft;
	unsigned parent_count, parent_line_count = 0, author_count;
	int err;
	const char *buffer_begin = buffer;

	if (verify_headers(buffer, size, &commit->object, options))
		return -1;

	if (!skip_prefix(buffer, "tree ", &buffer))
		return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
	if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
		err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
		if (err)
			return err;
	}
	buffer += 41;
	while (skip_prefix(buffer, "parent ", &buffer)) {
		if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
			err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
			if (err)
				return err;
		}
		buffer += 41;
		parent_line_count++;
	}
	graft = lookup_commit_graft(&commit->object.oid);
	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) {
			err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
			if (err)
				return err;
		}
	} else {
		if (parent_count != parent_line_count) {
			err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
			if (err)
				return err;
		}
	}
	author_count = 0;
	while (skip_prefix(buffer, "author ", &buffer)) {
		author_count++;
		err = fsck_ident(&buffer, &commit->object, options);
		if (err)
			return err;
	}
	if (author_count < 1)
		err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
	else if (author_count > 1)
		err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
	if (err)
		return err;
	if (!skip_prefix(buffer, "committer ", &buffer))
		return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
	err = fsck_ident(&buffer, &commit->object, options);
	if (err)
		return err;
	if (!commit->tree) {
		err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
		if (err)
			return err;
	}
	if (memchr(buffer_begin, '\0', size)) {
		err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
			     "NUL byte in the commit object body");
		if (err)
			return err;
	}
	return 0;
}

Project: git

int fsck_error_function(struct fsck_options *o,
	struct object *obj, int msg_type, const char *message)
{
	if (msg_type == FSCK_WARN) {
		warning("object %s: %s", describe_object(o, obj), message);
		return 0;
	}
	error("object %s: %s", describe_object(o, obj), message);
	return 1;
}

Project: git

int fsck_finish(struct fsck_options *options)
{
	int ret = 0;
	struct oidset_iter iter;
	const struct object_id *oid;

	oidset_iter_init(&gitmodules_found, &iter);
	while ((oid = oidset_iter_next(&iter))) {
		struct blob *blob;
		enum object_type type;
		unsigned long size;
		char *buf;

		if (oidset_contains(&gitmodules_done, oid))
			continue;

		blob = lookup_blob(oid);
		if (!blob) {
			ret |= report(options, &blob->object,
				      FSCK_MSG_GITMODULES_BLOB,
				      "non-blob found at .gitmodules");
			continue;
		}

		buf = read_sha1_file(oid->hash, &type, &size);
		if (!buf) {
			if (is_promisor_object(&blob->object.oid))
				continue;
			ret |= report(options, &blob->object,
				      FSCK_MSG_GITMODULES_MISSING,
				      "unable to read .gitmodules blob");
			continue;
		}

		if (type == OBJ_BLOB)
			ret |= fsck_blob(blob, buf, size, options);
		else
			ret |= report(options, &blob->object,
				      FSCK_MSG_GITMODULES_BLOB,
				      "non-blob found at .gitmodules");
		free(buf);
	}


	oidset_clear(&gitmodules_found);
	oidset_clear(&gitmodules_done);
	return ret;
}

Project: git

static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
{
	const char *p = *ident;
	char *end;

	*ident = strchrnul(*ident, '\n');
	if (**ident == '\n')
		(*ident)++;

	if (*p == '<')
		return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
	p += strcspn(p, "<>\n");
	if (*p == '>')
		return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
	if (*p != '<')
		return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
	if (p[-1] != ' ')
		return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
	p++;
	p += strcspn(p, "<>\n");
	if (*p != '>')
		return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
	p++;
	if (*p != ' ')
		return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
	p++;
	if (*p == '0' && p[1] != ' ')
		return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
	if (date_overflows(parse_timestamp(p, &end, 10)))
		return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
	if ((end == p || *end != ' '))
		return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
	p = end + 1;
	if ((*p != '+' && *p != '-') ||
	    !isdigit(p[1]) ||
	    !isdigit(p[2]) ||
	    !isdigit(p[3]) ||
	    !isdigit(p[4]) ||
	    (p[5] != '\n'))
		return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
	p += 6;
	return 0;
}

Project: git

static int fsck_msg_type(enum fsck_msg_id msg_id,
	struct fsck_options *options)
{
	int msg_type;

	assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);

	if (options->msg_type)
		msg_type = options->msg_type[msg_id];
	else {
		msg_type = msg_id_info[msg_id].msg_type;
		if (options->strict && msg_type == FSCK_WARN)
			msg_type = FSCK_ERROR;
	}

	return msg_type;
}

Project: git

int fsck_object(struct object *obj, void *data, unsigned long size,
	struct fsck_options *options)
{
	if (!obj)
		return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");

	if (obj->type == OBJ_BLOB)
		return fsck_blob((struct blob *)obj, data, size, options);
	if (obj->type == OBJ_TREE)
		return fsck_tree((struct tree *) obj, options);
	if (obj->type == OBJ_COMMIT)
		return fsck_commit((struct commit *) obj, (const char *) data,
			size, options);
	if (obj->type == OBJ_TAG)
		return fsck_tag((struct tag *) obj, (const char *) data,
			size, options);

	return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
			  obj->type);
}

Project: git

void fsck_set_msg_type(struct fsck_options *options,
		const char *msg_id, const char *msg_type)
{
	int id = parse_msg_id(msg_id), type;

	if (id < 0)
		die("Unhandled message id: %s", msg_id);
	type = parse_msg_type(msg_type);

	if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
		die("Cannot demote %s to %s", msg_id, msg_type);

	if (!options->msg_type) {
		int i;
		int *msg_type;
		ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
		for (i = 0; i < FSCK_MSG_MAX; i++)
			msg_type[i] = fsck_msg_type(i, options);
		options->msg_type = msg_type;
	}

	options->msg_type[id] = type;
}

Project: git

void fsck_set_msg_types(struct fsck_options *options, const char *values)
{
	char *buf = xstrdup(values), *to_free = buf;
	int done = 0;

	while (!done) {
		int len = strcspn(buf, " ,|"), equal;

		done = !buf[len];
		if (!len) {
			buf++;
			continue;
		}
		buf[len] = '\0';

		for (equal = 0;
		     equal < len && buf[equal] != '=' && buf[equal] != ':';
		     equal++)
			buf[equal] = tolower(buf[equal]);
		buf[equal] = '\0';

		if (!strcmp(buf, "skiplist")) {
			if (equal == len)
				die("skiplist requires a path");
			init_skiplist(options, buf + equal + 1);
			buf += len + 1;
			continue;
		}

		if (equal == len)
			die("Missing '=': '%s'", buf);

		fsck_set_msg_type(options, buf, buf + equal + 1);
		buf += len + 1;
	}
	free(to_free);
}

Project: git

static int fsck_tag(struct tag *tag, const char *data,
	unsigned long size, struct fsck_options *options)
{
	struct object *tagged = tag->tagged;

	if (!tagged)
		return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");

	return fsck_tag_buffer(tag, data, size, options);
}

Project: git

static int fsck_tag_buffer(struct tag *tag, const char *data,
	unsigned long size, struct fsck_options *options)
{
	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.oid.hash, &type, &size);
		if (!buffer)
			return report(options, &tag->object,
				FSCK_MSG_MISSING_TAG_OBJECT,
				"cannot read tag object");

		if (type != OBJ_TAG) {
			ret = report(options, &tag->object,
				FSCK_MSG_TAG_OBJECT_NOT_TAG,
				"expected tag got %s",
			    type_name(type));
			goto done;
		}
	}

	ret = verify_headers(buffer, size, &tag->object, options);
	if (ret)
		goto done;

	if (!skip_prefix(buffer, "object ", &buffer)) {
		ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
		goto done;
	}
	if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
		ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
		if (ret)
			goto done;
	}
	buffer += 41;

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

	if (!skip_prefix(buffer, "tag ", &buffer)) {
		ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
		goto done;
	}
	eol = strchr(buffer, '\n');
	if (!eol) {
		ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "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)) {
		ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
			   "invalid 'tag' name: %.*s",
			   (int)(eol - buffer), buffer);
		if (ret)
			goto done;
	}
	buffer = eol + 1;

	if (!skip_prefix(buffer, "tagger ", &buffer)) {
		/* early tags do not contain 'tagger' lines; warn only */
		ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
		if (ret)
			goto done;
	}
	else
		ret = fsck_ident(&buffer, &tag->object, options);

done:
	strbuf_release(&sb);
	free(to_free);
	return ret;
}

Project: git

static int fsck_tree(struct tree *item, struct fsck_options *options)
{
	int retval = 0;
	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;

	if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
		retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
		return retval;
	}

	o_mode = 0;
	o_name = NULL;

	while (desc.size) {
		unsigned mode;
		const char *name;
		const struct object_id *oid;

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

		has_null_sha1 |= is_null_oid(oid);
		has_full_path |= !!strchr(name, '/');
		has_empty_name |= !*name;
		has_dot |= !strcmp(name, ".");
		has_dotdot |= !strcmp(name, "..");
		has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
		has_zero_pad |= *(char *)desc.buffer == '0';

		if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
			if (!S_ISLNK(mode))
				oidset_insert(&gitmodules_found, oid);
			else
				retval += report(options, &item->object,
						 FSCK_MSG_GITMODULES_SYMLINK,
						 ".gitmodules is a symbolic link");
		}

		if (update_tree_entry_gently(&desc)) {
			retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
			break;
		}

		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 (!options->strict)
				break;
			/* fallthrough */
		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;
	}

	if (has_null_sha1)
		retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
	if (has_full_path)
		retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
	if (has_empty_name)
		retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
	if (has_dot)
		retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
	if (has_dotdot)
		retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
	if (has_dotgit)
		retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
	if (has_zero_pad)
		retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
	if (has_bad_modes)
		retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
	if (has_dup_entries)
		retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
	if (not_properly_sorted)
		retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
	return retval;
}

Project: git

static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
{
	int counter = 0, generation = 0, name_prefix_len = 0;
	struct commit_list *parents;
	int res;
	int result;
	const char *name;

	if (parse_commit(commit))
		return -1;

	name = get_object_name(options, &commit->object);
	if (name)
		put_object_name(options, &commit->tree->object, "%s:", name);

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

	parents = commit->parents;
	if (name && parents) {
		int len = strlen(name), power;

		if (len && name[len - 1] == '^') {
			generation = 1;
			name_prefix_len = len - 1;
		}
		else { /* parse ~<generation> suffix */
			for (generation = 0, power = 1;
			     len && isdigit(name[len - 1]);
			     power *= 10)
				generation += power * (name[--len] - '0');
			if (power > 1 && len && name[len - 1] == '~')
				name_prefix_len = len - 1;
		}
	}

	while (parents) {
		if (name) {
			struct object *obj = &parents->item->object;

			if (++counter > 1)
				put_object_name(options, obj, "%s^%d",
					name, counter);
			else if (generation > 0)
				put_object_name(options, obj, "%.*s~%d",
					name_prefix_len, name, generation + 1);
			else
				put_object_name(options, obj, "%s^", name);
		}
		result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
		if (result < 0)
			return result;
		if (!res)
			res = result;
		parents = parents->next;
	}
	return res;
}

Project: git

static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
{
	char *name = get_object_name(options, &tag->object);

	if (parse_tag(tag))
		return -1;
	if (name)
		put_object_name(options, tag->tagged, "%s", name);
	return options->walk(tag->tagged, OBJ_ANY, data, options);
}

Project: git

static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
{
	struct tree_desc desc;
	struct name_entry entry;
	int res = 0;
	const char *name;

	if (parse_tree(tree))
		return -1;

	name = get_object_name(options, &tree->object);
	if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
		return -1;
	while (tree_entry_gently(&desc, &entry)) {
		struct object *obj;
		int result;

		if (S_ISGITLINK(entry.mode))
			continue;

		if (S_ISDIR(entry.mode)) {
			obj = (struct object *)lookup_tree(entry.oid);
			if (name && obj)
				put_object_name(options, obj, "%s%s/", name,
					entry.path);
			result = options->walk(obj, OBJ_TREE, data, options);
		}
		else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
			obj = (struct object *)lookup_blob(entry.oid);
			if (name && obj)
				put_object_name(options, obj, "%s%s", name,
					entry.path);
			result = options->walk(obj, OBJ_BLOB, data, options);
		}
		else {
			result = error("in tree %s: entry %s has bad mode %.6o",
					describe_object(options, &tree->object), entry.path, entry.mode);
		}
		if (result < 0)
			return result;
		if (!res)
			res = result;
	}
	return res;
}

Project: git

static void init_skiplist(struct fsck_options *options, const char *path)
{
	static struct oid_array skiplist = OID_ARRAY_INIT;
	int sorted, fd;
	char buffer[GIT_MAX_HEXSZ + 1];
	struct object_id oid;

	if (options->skiplist)
		sorted = options->skiplist->sorted;
	else {
		sorted = 1;
		options->skiplist = &skiplist;
	}

	fd = open(path, O_RDONLY);
	if (fd < 0)
		die("Could not open skip list: %s", path);
	for (;;) {
		const char *p;
		int result = read_in_full(fd, buffer, sizeof(buffer));
		if (result < 0)
			die_errno("Could not read '%s'", path);
		if (!result)
			break;
		if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
			die("Invalid SHA-1: %s", buffer);
		oid_array_append(&skiplist, &oid);
		if (sorted && skiplist.nr > 1 &&
				oidcmp(&skiplist.oid[skiplist.nr - 2],
				       &oid) > 0)
			sorted = 0;
	}
	close(fd);

	if (sorted)
		skiplist.sorted = 1;
}

Project: git

int is_valid_msg_type(const char *msg_id, const char *msg_type)
{
	if (parse_msg_id(msg_id) < 0)
		return 0;
	parse_msg_type(msg_type);
	return 1;
}

Project: git

static int parse_msg_id(const char *text)
{
	int i;

	if (!msg_id_info[0].downcased) {
		/* convert id_string to lower case, without underscores. */
		for (i = 0; i < FSCK_MSG_MAX; i++) {
			const char *p = msg_id_info[i].id_string;
			int len = strlen(p);
			char *q = xmalloc(len);

			msg_id_info[i].downcased = q;
			while (*p)
				if (*p == '_')
					p++;
				else
					*(q)++ = tolower(*(p)++);
			*q = '\0';
		}
	}

	for (i = 0; i < FSCK_MSG_MAX; i++)
		if (!strcmp(text, msg_id_info[i].downcased))
			return i;

	return -1;
}

Project: git

static void put_object_name(struct fsck_options *options, struct object *obj,
	const char *fmt, ...)
{
	va_list ap;
	struct strbuf buf = STRBUF_INIT;
	char *existing;

	if (!options->object_names)
		return;
	existing = lookup_decoration(options->object_names, obj);
	if (existing)
		return;
	va_start(ap, fmt);
	strbuf_vaddf(&buf, fmt, ap);
	add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
	va_end(ap);
}

Project: git

static int report(struct fsck_options *options, struct object *object,
	enum fsck_msg_id id, const char *fmt, ...)
{
	va_list ap;
	struct strbuf sb = STRBUF_INIT;
	int msg_type = fsck_msg_type(id, options), result;

	if (msg_type == FSCK_IGNORE)
		return 0;

	if (options->skiplist && object &&
			oid_array_lookup(options->skiplist, &object->oid) >= 0)
		return 0;

	if (msg_type == FSCK_FATAL)
		msg_type = FSCK_ERROR;
	else if (msg_type == FSCK_INFO)
		msg_type = FSCK_WARN;

	append_msg_id(&sb, msg_id_info[id].id_string);

	va_start(ap, fmt);
	strbuf_vaddf(&sb, fmt, ap);
	result = options->error_func(options, object, msg_type, sb.buf);
	strbuf_release(&sb);
	va_end(ap);

	return result;
}

Project: git

static int verify_headers(const void *data, unsigned long size,
			  struct object *obj, struct fsck_options *options)
{
	const char *buffer = (const char *)data;
	unsigned long i;

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

	/*
	 * We did not find double-LF that separates the header
	 * and the body.  Not having a body is not a crime but
	 * we do want to see the terminating LF for the last header
	 * line.
	 */
	if (size && buffer[size - 1] == '\n')
		return 0;

	return report(options, obj,
		FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
}

Project: git

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;
}