1 files changed, 381 insertions, 85 deletions

diff --git a/fsck.c b/fsck.c
index 0531545..38624d2 100644
--- a/fsck.c
+++ b/fsck.c
@@ -1,4 +1,6 @@
 #include "cache.h"
+#include "object-store.h"
+#include "repository.h"
 #include "object.h"
 #include "blob.h"
 #include "tree.h"
@@ -8,7 +10,15 @@
 #include "fsck.h"
 #include "refs.h"
 #include "utf8.h"
-#include "sha1-array.h"
+#include "decorate.h"
+#include "oidset.h"
+#include "packfile.h"
+#include "submodule-config.h"
+#include "config.h"
+#include "help.h"
+
+static struct oidset gitmodules_found = OIDSET_INIT;
+static struct oidset gitmodules_done = OIDSET_INIT;
 
 #define FSCK_FATAL -1
 #define FSCK_INFO -2
@@ -43,6 +53,7 @@
 	FUNC(MISSING_TAG_ENTRY, ERROR) \
 	FUNC(MISSING_TAG_OBJECT, ERROR) \
 	FUNC(MISSING_TREE, ERROR) \
+	FUNC(MISSING_TREE_OBJECT, ERROR) \
 	FUNC(MISSING_TYPE, ERROR) \
 	FUNC(MISSING_TYPE_ENTRY, ERROR) \
 	FUNC(MULTIPLE_AUTHORS, ERROR) \
@@ -50,6 +61,13 @@
 	FUNC(TREE_NOT_SORTED, ERROR) \
 	FUNC(UNKNOWN_TYPE, ERROR) \
 	FUNC(ZERO_PADDED_DATE, ERROR) \
+	FUNC(GITMODULES_MISSING, ERROR) \
+	FUNC(GITMODULES_BLOB, ERROR) \
+	FUNC(GITMODULES_LARGE, ERROR) \
+	FUNC(GITMODULES_NAME, ERROR) \
+	FUNC(GITMODULES_SYMLINK, ERROR) \
+	FUNC(GITMODULES_URL, ERROR) \
+	FUNC(GITMODULES_PATH, ERROR) \
 	/* warnings */ \
 	FUNC(BAD_FILEMODE, WARN) \
 	FUNC(EMPTY_NAME, WARN) \
@@ -61,6 +79,7 @@
 	FUNC(ZERO_PADDED_FILEMODE, WARN) \
 	FUNC(NUL_IN_COMMIT, WARN) \
 	/* infos (reported as warnings, but ignored by default) */ \
+	FUNC(GITMODULES_PARSE, INFO) \
 	FUNC(BAD_TAG_NAME, INFO) \
 	FUNC(MISSING_TAGGER_ENTRY, INFO)
 
@@ -72,37 +91,60 @@ enum fsck_msg_id {
 #undef MSG_ID
 
 #define STR(x) #x
-#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
+#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
 static struct {
 	const char *id_string;
 	const char *downcased;
+	const char *camelcased;
 	int msg_type;
 } msg_id_info[FSCK_MSG_MAX + 1] = {
 	FOREACH_MSG_ID(MSG_ID)
-	{ NULL, NULL, -1 }
+	{ NULL, NULL, NULL, -1 }
 };
 #undef MSG_ID
 
-static int parse_msg_id(const char *text)
+static void prepare_msg_ids(void)
 {
 	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';
+	if (msg_id_info[0].downcased)
+		return;
+
+	/* 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';
+
+		p = msg_id_info[i].id_string;
+		q = xmalloc(len);
+		msg_id_info[i].camelcased = q;
+		while (*p) {
+			if (*p == '_') {
+				p++;
+				if (*p)
+					*q++ = *p++;
+			} else {
+				*q++ = tolower(*p++);
+			}
 		}
+		*q = '\0';
 	}
+}
+
+static int parse_msg_id(const char *text)
+{
+	int i;
+
+	prepare_msg_ids();
 
 	for (i = 0; i < FSCK_MSG_MAX; i++)
 		if (!strcmp(text, msg_id_info[i].downcased))
@@ -111,6 +153,16 @@ static int parse_msg_id(const char *text)
 	return -1;
 }
 
+void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
+{
+	int i;
+
+	prepare_msg_ids();
+
+	for (i = 0; i < FSCK_MSG_MAX; i++)
+		list_config_item(list, prefix, msg_id_info[i].camelcased);
+}
+
 static int fsck_msg_type(enum fsck_msg_id msg_id,
 	struct fsck_options *options)
 {
@@ -131,39 +183,37 @@ static int fsck_msg_type(enum fsck_msg_id msg_id,
 
 static void init_skiplist(struct fsck_options *options, const char *path)
 {
-	static struct sha1_array skiplist = SHA1_ARRAY_INIT;
-	int sorted, fd;
-	char buffer[41];
-	unsigned char sha1[20];
-
-	if (options->skiplist)
-		sorted = options->skiplist->sorted;
-	else {
-		sorted = 1;
-		options->skiplist = &skiplist;
-	}
+	FILE *fp;
+	struct strbuf sb = STRBUF_INIT;
+	struct object_id oid;
 
-	fd = open(path, O_RDONLY);
-	if (fd < 0)
+	fp = fopen(path, "r");
+	if (!fp)
 		die("Could not open skip list: %s", path);
-	for (;;) {
-		int result = read_in_full(fd, buffer, sizeof(buffer));
-		if (result < 0)
-			die_errno("Could not read '%s'", path);
-		if (!result)
-			break;
-		if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
-			die("Invalid SHA-1: %s", buffer);
-		sha1_array_append(&skiplist, sha1);
-		if (sorted && skiplist.nr > 1 &&
-				hashcmp(skiplist.sha1[skiplist.nr - 2],
-					sha1) > 0)
-			sorted = 0;
-	}
-	close(fd);
+	while (!strbuf_getline(&sb, fp)) {
+		const char *p;
+		const char *hash;
+
+		/*
+		 * Allow trailing comments, leading whitespace
+		 * (including before commits), and empty or whitespace
+		 * only lines.
+		 */
+		hash = strchr(sb.buf, '#');
+		if (hash)
+			strbuf_setlen(&sb, hash - sb.buf);
+		strbuf_trim(&sb);
+		if (!sb.len)
+			continue;
 
-	if (sorted)
-		skiplist.sorted = 1;
+		if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0')
+			die("Invalid SHA-1: %s", sb.buf);
+		oidset_insert(&options->skiplist, &oid);
+	}
+	if (ferror(fp))
+		die_errno("Could not read '%s'", path);
+	fclose(fp);
+	strbuf_release(&sb);
 }
 
 static int parse_msg_type(const char *str)
@@ -266,6 +316,11 @@ static void append_msg_id(struct strbuf *sb, const char *msg_id)
 	strbuf_addstr(sb, ": ");
 }
 
+static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
+{
+	return opts && obj && oidset_contains(&opts->skiplist, &obj->oid);
+}
+
 __attribute__((format (printf, 4, 5)))
 static int report(struct fsck_options *options, struct object *object,
 	enum fsck_msg_id id, const char *fmt, ...)
@@ -277,8 +332,7 @@ static int report(struct fsck_options *options, struct object *object,
 	if (msg_type == FSCK_IGNORE)
 		return 0;
 
-	if (options->skiplist && object &&
-			sha1_array_lookup(options->skiplist, object->oid.hash) >= 0)
+	if (object_on_skiplist(options, object))
 		return 0;
 
 	if (msg_type == FSCK_FATAL)
@@ -290,35 +344,88 @@ static int report(struct fsck_options *options, struct object *object,
 
 	va_start(ap, fmt);
 	strbuf_vaddf(&sb, fmt, ap);
-	result = options->error_func(object, msg_type, sb.buf);
+	result = options->error_func(options, object, msg_type, sb.buf);
 	strbuf_release(&sb);
 	va_end(ap);
 
 	return result;
 }
 
+static char *get_object_name(struct fsck_options *options, struct object *obj)
+{
+	if (!options->object_names)
+		return NULL;
+	return lookup_decoration(options->object_names, obj);
+}
+
+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);
+}
+
+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;
+}
+
 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;
 
-	init_tree_desc(&desc, tree->buffer, tree->size);
-	while (tree_entry(&desc, &entry)) {
+	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))
-			result = options->walk(&lookup_tree(entry.oid->hash)->object, OBJ_TREE, data, options);
-		else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
-			result = options->walk(&lookup_blob(entry.oid->hash)->object, OBJ_BLOB, data, options);
+
+		if (S_ISDIR(entry.mode)) {
+			obj = (struct object *)lookup_tree(the_repository, 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(the_repository, 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",
-					oid_to_hex(&tree->object.oid), entry.path, entry.mode);
+					describe_object(options, &tree->object), entry.path, entry.mode);
 		}
 		if (result < 0)
 			return result;
@@ -330,20 +437,57 @@ static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *op
 
 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;
 
-	result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
+	name = get_object_name(options, &commit->object);
+	if (name)
+		put_object_name(options, &get_commit_tree(commit)->object,
+				"%s:", name);
+
+	result = options->walk((struct object *)get_commit_tree(commit),
+			       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;
@@ -356,8 +500,12 @@ static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_optio
 
 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);
 }
 
@@ -365,6 +513,10 @@ int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 {
 	if (!obj)
 		return -1;
+
+	if (obj->type == OBJ_NONE)
+		parse_object(the_repository, &obj->oid);
+
 	switch (obj->type) {
 	case OBJ_BLOB:
 		return 0;
@@ -375,7 +527,7 @@ int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 	case OBJ_TAG:
 		return fsck_walk_tag((struct tag *)obj, data, options);
 	default:
-		error("Unknown object type for %s", oid_to_hex(&obj->oid));
+		error("Unknown object type for %s", describe_object(options, obj));
 		return -1;
 	}
 }
@@ -428,7 +580,7 @@ static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, con
 
 static int fsck_tree(struct tree *item, struct fsck_options *options)
 {
-	int retval;
+	int retval = 0;
 	int has_null_sha1 = 0;
 	int has_full_path = 0;
 	int has_empty_name = 0;
@@ -443,7 +595,10 @@ static int fsck_tree(struct tree *item, struct fsck_options *options)
 	unsigned o_mode;
 	const char *o_name;
 
-	init_tree_desc(&desc, item->buffer, item->size);
+	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;
@@ -460,11 +615,22 @@ static int fsck_tree(struct tree *item, struct fsck_options *options)
 		has_empty_name |= !*name;
 		has_dot |= !strcmp(name, ".");
 		has_dotdot |= !strcmp(name, "..");
-		has_dotgit |= (!strcmp(name, ".git") ||
-			       is_hfs_dotgit(name) ||
-			       is_ntfs_dotgit(name));
+		has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 		has_zero_pad |= *(char *)desc.buffer == '0';
-		update_tree_entry(&desc);
+
+		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) {
 		/*
@@ -484,6 +650,7 @@ static int fsck_tree(struct tree *item, struct fsck_options *options)
 		case S_IFREG | 0664:
 			if (!options->strict)
 				break;
+			/* fallthrough */
 		default:
 			has_bad_modes = 1;
 		}
@@ -505,7 +672,6 @@ static int fsck_tree(struct tree *item, struct fsck_options *options)
 		o_name = name;
 	}
 
-	retval = 0;
 	if (has_null_sha1)
 		retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 	if (has_full_path)
@@ -588,7 +754,7 @@ static int fsck_ident(const char **ident, struct object *obj, struct fsck_option
 	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(strtoul(p, &end, 10)))
+	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");
@@ -607,33 +773,34 @@ static int fsck_ident(const char **ident, struct object *obj, struct fsck_option
 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 object_id tree_oid, oid;
 	struct commit_graft *graft;
 	unsigned parent_count, parent_line_count = 0, author_count;
 	int err;
 	const char *buffer_begin = buffer;
+	const char *p;
 
 	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') {
+	if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 		err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 		if (err)
 			return err;
 	}
-	buffer += 41;
+	buffer = p + 1;
 	while (skip_prefix(buffer, "parent ", &buffer)) {
-		if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
+		if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 			err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 			if (err)
 				return err;
 		}
-		buffer += 41;
+		buffer = p + 1;
 		parent_line_count++;
 	}
-	graft = lookup_commit_graft(commit->object.oid.hash);
+	graft = lookup_commit_graft(the_repository, &commit->object.oid);
 	parent_count = commit_list_count(commit->parents);
 	if (graft) {
 		if (graft->nr_parent == -1 && !parent_count)
@@ -668,8 +835,8 @@ static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 	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 (!get_commit_tree(commit)) {
+		err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 		if (err)
 			return err;
 	}
@@ -695,11 +862,12 @@ static int fsck_commit(struct commit *commit, const char *data,
 static int fsck_tag_buffer(struct tag *tag, const char *data,
 	unsigned long size, struct fsck_options *options)
 {
-	unsigned char sha1[20];
+	struct object_id oid;
 	int ret = 0;
 	const char *buffer;
 	char *to_free = NULL, *eol;
 	struct strbuf sb = STRBUF_INIT;
+	const char *p;
 
 	if (data)
 		buffer = data;
@@ -707,7 +875,7 @@ static int fsck_tag_buffer(struct tag *tag, const char *data,
 		enum object_type type;
 
 		buffer = to_free =
-			read_sha1_file(tag->object.oid.hash, &type, &size);
+			read_object_file(&tag->object.oid, &type, &size);
 		if (!buffer)
 			return report(options, &tag->object,
 				FSCK_MSG_MISSING_TAG_OBJECT,
@@ -717,7 +885,7 @@ static int fsck_tag_buffer(struct tag *tag, const char *data,
 			ret = report(options, &tag->object,
 				FSCK_MSG_TAG_OBJECT_NOT_TAG,
 				"expected tag got %s",
-			    typename(type));
+			    type_name(type));
 			goto done;
 		}
 	}
@@ -730,12 +898,12 @@ static int fsck_tag_buffer(struct tag *tag, const char *data,
 		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') {
+	if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 		ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 		if (ret)
 			goto done;
 	}
-	buffer += 41;
+	buffer = p + 1;
 
 	if (!skip_prefix(buffer, "type ", &buffer)) {
 		ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
@@ -797,6 +965,83 @@ static int fsck_tag(struct tag *tag, const char *data,
 	return fsck_tag_buffer(tag, data, size, options);
 }
 
+struct fsck_gitmodules_data {
+	struct object *obj;
+	struct fsck_options *options;
+	int ret;
+};
+
+static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
+{
+	struct fsck_gitmodules_data *data = vdata;
+	const char *subsection, *key;
+	int subsection_len;
+	char *name;
+
+	if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
+	    !subsection)
+		return 0;
+
+	name = xmemdupz(subsection, subsection_len);
+	if (check_submodule_name(name) < 0)
+		data->ret |= report(data->options, data->obj,
+				    FSCK_MSG_GITMODULES_NAME,
+				    "disallowed submodule name: %s",
+				    name);
+	if (!strcmp(key, "url") && value &&
+	    looks_like_command_line_option(value))
+		data->ret |= report(data->options, data->obj,
+				    FSCK_MSG_GITMODULES_URL,
+				    "disallowed submodule url: %s",
+				    value);
+	if (!strcmp(key, "path") && value &&
+	    looks_like_command_line_option(value))
+		data->ret |= report(data->options, data->obj,
+				    FSCK_MSG_GITMODULES_PATH,
+				    "disallowed submodule path: %s",
+				    value);
+	free(name);
+
+	return 0;
+}
+
+static int fsck_blob(struct blob *blob, const char *buf,
+		     unsigned long size, struct fsck_options *options)
+{
+	struct fsck_gitmodules_data data;
+	struct config_options config_opts = { 0 };
+
+	if (!oidset_contains(&gitmodules_found, &blob->object.oid))
+		return 0;
+	oidset_insert(&gitmodules_done, &blob->object.oid);
+
+	if (object_on_skiplist(options, &blob->object))
+		return 0;
+
+	if (!buf) {
+		/*
+		 * A missing buffer here is a sign that the caller found the
+		 * blob too gigantic to load into memory. Let's just consider
+		 * that an error.
+		 */
+		return report(options, &blob->object,
+			      FSCK_MSG_GITMODULES_LARGE,
+			      ".gitmodules too large to parse");
+	}
+
+	data.obj = &blob->object;
+	data.options = options;
+	data.ret = 0;
+	config_opts.error_action = CONFIG_ERROR_SILENT;
+	if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
+				".gitmodules", buf, size, &data, &config_opts))
+		data.ret |= report(options, &blob->object,
+				   FSCK_MSG_GITMODULES_PARSE,
+				   "could not parse gitmodules blob");
+
+	return data.ret;
+}
+
 int fsck_object(struct object *obj, void *data, unsigned long size,
 	struct fsck_options *options)
 {
@@ -804,7 +1049,7 @@ int fsck_object(struct object *obj, void *data, unsigned long size,
 		return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 
 	if (obj->type == OBJ_BLOB)
-		return 0;
+		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)
@@ -818,12 +1063,63 @@ int fsck_object(struct object *obj, void *data, unsigned long size,
 			  obj->type);
 }
 
-int fsck_error_function(struct object *obj, int msg_type, const char *message)
+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", oid_to_hex(&obj->oid), message);
+		warning("object %s: %s", describe_object(o, obj), message);
 		return 0;
 	}
-	error("object %s: %s", oid_to_hex(&obj->oid), message);
+	error("object %s: %s", describe_object(o, obj), message);
 	return 1;
 }
+
+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(the_repository, oid);
+		if (!blob) {
+			struct object *obj = lookup_unknown_object(oid->hash);
+			ret |= report(options, obj,
+				      FSCK_MSG_GITMODULES_BLOB,
+				      "non-blob found at .gitmodules");
+			continue;
+		}
+
+		buf = read_object_file(oid, &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;
+}