[thirdparty/git.git] / fsck-cache.c

#include <sys/types.h>
#include <dirent.h>

#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tag.h"
#include "delta.h"

#define REACHABLE 0x0001

static int show_root = 0;
static int show_tags = 0;
static int show_unreachable = 0;
static int show_max_delta_depth = 0;
static int keep_cache_objects = 0; 
static unsigned char head_sha1[20];

static void expand_deltas(void)
{
	int i, max_depth = 0;

	/*
	 * To be as efficient as possible we look for delta heads and
	 * recursively process them going backward, and parsing
	 * resulting objects along the way.  This allows for processing
	 * each delta objects only once regardless of the delta depth.
	 */
	for (i = 0; i < nr_objs; i++) {
		struct object *obj = objs[i];
		if (obj->parsed && !obj->delta && obj->attached_deltas) {
			int depth = 0;
			char type[10];
			unsigned long size;
			void *buf = read_sha1_file(obj->sha1, type, &size);
			if (!buf)
				continue;
			depth = process_deltas(buf, size, obj->type,
					       obj->attached_deltas);
			if (max_depth < depth)
				max_depth = depth;
		}
	}
	if (show_max_delta_depth)
		printf("maximum delta depth = %d\n", max_depth);
}
															
static void check_connectivity(void)
{
	int i;

	/* Look up all the requirements, warn about missing objects.. */
	for (i = 0; i < nr_objs; i++) {
		struct object *obj = objs[i];
		struct object_list *refs;

		if (!obj->parsed) {
			if (obj->delta)
				printf("unresolved delta %s\n",
				       sha1_to_hex(obj->sha1));
			else
				printf("missing %s %s\n",
				       obj->type, sha1_to_hex(obj->sha1));
			continue;
		}

		for (refs = obj->refs; refs; refs = refs->next) {
			if (refs->item->parsed)
				continue;
			printf("broken link from %7s %s\n",
			       obj->type, sha1_to_hex(obj->sha1));
			printf("              to %7s %s\n",
			       refs->item->type, sha1_to_hex(refs->item->sha1));
		}

		/* Don't bother with tag reachability. */
		if (obj->type == tag_type)
			continue;

		if (show_unreachable && !(obj->flags & REACHABLE)) {
			if (obj->attached_deltas)
				printf("foreign delta reference %s\n", 
				       sha1_to_hex(obj->sha1));
			else
				printf("unreachable %s %s\n",
				       obj->type, sha1_to_hex(obj->sha1));
			continue;
		}

		if (!obj->used) {
			printf("dangling %s %s\n", obj->type, 
			       sha1_to_hex(obj->sha1));
		}
	}
}

/*
 * 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(struct tree_entry_list *a, struct tree_entry_list *b)
{
	int len1 = strlen(a->name);
	int len2 = strlen(b->name);
	int len = len1 < len2 ? len1 : len2;
	unsigned char c1, c2;
	int cmp;

	cmp = memcmp(a->name, b->name, 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 = a->name[len];
	c2 = b->name[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 && a->directory)
		c1 = '/';
	if (!c2 && b->directory)
		c2 = '/';
	return c1 < c2 ? 0 : TREE_UNORDERED;
}

static int fsck_tree(struct tree *item)
{
	int has_full_path = 0;
	struct tree_entry_list *entry, *last;

	last = NULL;
	for (entry = item->entries; entry; entry = entry->next) {
		if (strchr(entry->name, '/'))
			has_full_path = 1;

		switch (entry->mode) {
		/*
		 * Standard modes.. 
		 */
		case S_IFREG | 0755:
		case S_IFREG | 0644:
		case S_IFLNK:
		case S_IFDIR:
			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:
			break;
		default:
			printf("tree %s has entry %o %s\n",
				sha1_to_hex(item->object.sha1),
				entry->mode, entry->name);
		}

		if (last) {
			switch (verify_ordered(last, entry)) {
			case TREE_UNORDERED:
				fprintf(stderr, "tree %s not ordered\n",
					sha1_to_hex(item->object.sha1));
				return -1;
			case TREE_HAS_DUPS:
				fprintf(stderr, "tree %s has duplicate entries for '%s'\n",
					sha1_to_hex(item->object.sha1),
					entry->name);
				return -1;
			default:
				break;
			}
		}

		last = entry;
	}

	if (has_full_path) {
		fprintf(stderr, "warning: git-fsck-cache: tree %s "
			"has full pathnames in it\n", 
			sha1_to_hex(item->object.sha1));
	}

	return 0;
}

static int fsck_commit(struct commit *commit)
{
	free(commit->buffer);
	commit->buffer = NULL;
	if (!commit->tree)
		return -1;
	if (!commit->parents && show_root)
		printf("root %s\n", sha1_to_hex(commit->object.sha1));
	if (!commit->date)
		printf("bad commit date in %s\n", 
		       sha1_to_hex(commit->object.sha1));
	return 0;
}

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

	if (!tagged) {
		printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
		return -1;
	}
	if (!show_tags)
		return 0;

	printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
	printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
	return 0;
}

static int fsck_sha1(unsigned char *sha1)
{
	struct object *obj = parse_object(sha1);
	if (!obj)
		return -1;
	if (obj->type == blob_type)
		return 0;
	if (obj->type == tree_type)
		return fsck_tree((struct tree *) obj);
	if (obj->type == commit_type)
		return fsck_commit((struct commit *) obj);
	if (obj->type == tag_type)
		return fsck_tag((struct tag *) obj);
	if (!obj->type && obj->delta)
		return 0;
	return -1;
}

/*
 * This is the sorting chunk size: make it reasonably
 * big so that we can sort well..
 */
#define MAX_SHA1_ENTRIES (1024)

struct sha1_entry {
	unsigned long ino;
	unsigned char sha1[20];
};

static struct {
	unsigned long nr;
	struct sha1_entry *entry[MAX_SHA1_ENTRIES];
} sha1_list;

static int ino_compare(const void *_a, const void *_b)
{
	const struct sha1_entry *a = _a, *b = _b;
	unsigned long ino1 = a->ino, ino2 = b->ino;
	return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
}

static void fsck_sha1_list(void)
{
	int i, nr = sha1_list.nr;

	qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
	for (i = 0; i < nr; i++) {
		struct sha1_entry *entry = sha1_list.entry[i];
		unsigned char *sha1 = entry->sha1;

		sha1_list.entry[i] = NULL;
		if (fsck_sha1(sha1) < 0)
			fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
		free(entry);
	}
	sha1_list.nr = 0;
}

static void add_sha1_list(unsigned char *sha1, unsigned long ino)
{
	struct sha1_entry *entry = xmalloc(sizeof(*entry));
	int nr;

	entry->ino = ino;
	memcpy(entry->sha1, sha1, 20);
	nr = sha1_list.nr;
	if (nr == MAX_SHA1_ENTRIES) {
		fsck_sha1_list();
		nr = 0;
	}
	sha1_list.entry[nr] = entry;
	sha1_list.nr = ++nr;
}

static int fsck_dir(int i, char *path)
{
	DIR *dir = opendir(path);
	struct dirent *de;

	if (!dir) {
		return error("missing sha1 directory '%s'", path);
	}

	while ((de = readdir(dir)) != NULL) {
		char name[100];
		unsigned char sha1[20];
		int len = strlen(de->d_name);

		switch (len) {
		case 2:
			if (de->d_name[1] != '.')
				break;
		case 1:
			if (de->d_name[0] != '.')
				break;
			continue;
		case 38:
			sprintf(name, "%02x", i);
			memcpy(name+2, de->d_name, len+1);
			if (get_sha1_hex(name, sha1) < 0)
				break;
			add_sha1_list(sha1, de->d_ino);
			continue;
		}
		fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	}
	closedir(dir);
	return 0;
}

static int read_sha1_reference(const char *path)
{
	char hexname[60];
	unsigned char sha1[20];
	int fd = open(path, O_RDONLY), len;
	struct object *obj;

	if (fd < 0)
		return -1;

	len = read(fd, hexname, sizeof(hexname));
	close(fd);
	if (len < 40)
		return -1;

	if (get_sha1_hex(hexname, sha1) < 0)
		return -1;

	obj = lookup_object(sha1);
	if (!obj)
		return error("%s: invalid sha1 pointer %.40s", path, hexname);

	obj->used = 1;
	mark_reachable(obj, REACHABLE);
	return 0;
}

static int find_file_objects(const char *base, const char *name)
{
	int baselen = strlen(base);
	int namelen = strlen(name);
	char *path = xmalloc(baselen + namelen + 2);
	struct stat st;

	memcpy(path, base, baselen);
	path[baselen] = '/';
	memcpy(path + baselen + 1, name, namelen+1);
	if (stat(path, &st) < 0)
		return 0;

	/*
	 * Recurse into directories
	 */
	if (S_ISDIR(st.st_mode)) {
		int count = 0;
		DIR *dir = opendir(path);
		if (dir) {
			struct dirent *de;
			while ((de = readdir(dir)) != NULL) {
				if (de->d_name[0] == '.')
					continue;
				count += find_file_objects(path, de->d_name);
			}
			closedir(dir);
		}
		return count;
	}
	if (S_ISREG(st.st_mode))
		return read_sha1_reference(path) == 0;
	return 0;
}

static void get_default_heads(void)
{
	char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
	int count = find_file_objects(git_dir, "refs");
	if (!count)
		die("No default references");
}

int main(int argc, char **argv)
{
	int i, heads;
	char *sha1_dir;

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];

		if (!strcmp(arg, "--unreachable")) {
			show_unreachable = 1;
			continue;
		}
		if (!strcmp(arg, "--tags")) {
			show_tags = 1;
			continue;
		}
		if (!strcmp(arg, "--root")) {
			show_root = 1;
			continue;
		}
		if (!strcmp(arg, "--delta-depth")) {
			show_max_delta_depth = 1;
			continue;
		}
		if (!strcmp(arg, "--cache")) {
			keep_cache_objects = 1;
			continue;
		}
		if (*arg == '-')
			usage("git-fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
	}

	sha1_dir = get_object_directory();
	for (i = 0; i < 256; i++) {
		static char dir[4096];
		sprintf(dir, "%s/%02x", sha1_dir, i);
		fsck_dir(i, dir);
	}
	fsck_sha1_list();

	expand_deltas();

	heads = 0;
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i]; 

		if (*arg == '-')
			continue;

		if (!get_sha1(arg, head_sha1)) {
			struct object *obj = lookup_object(head_sha1);

			/* Error is printed by lookup_object(). */
			if (!obj)
				continue;

			obj->used = 1;
			mark_reachable(obj, REACHABLE);
			heads++;
			continue;
		}
		error("expected sha1, got %s", arg);
	}

	/*
	 * If we've not been given any explicit head information, do the
	 * default ones from .git/refs. We also consider the index file
	 * in this case (ie this implies --cache).
	 */
	if (!heads) {
		get_default_heads();
		keep_cache_objects = 1;
	}

	if (keep_cache_objects) {
		int i;
		read_cache();
		for (i = 0; i < active_nr; i++) {
			struct blob *blob = lookup_blob(active_cache[i]->sha1);
			struct object *obj;
			if (!blob)
				continue;
			obj = &blob->object;
			obj->used = 1;
			mark_reachable(obj, REACHABLE);
		}
	}

	check_connectivity();
	return 0;
}
Commit	Line	Data
20222118 LT	1	#include <sys/types.h>
	2	#include <dirent.h>
	3
4b182421	4	#include "cache.h"
ff5ebe39 DB	5	#include "commit.h"
	6	#include "tree.h"
	7	#include "blob.h"
c418eda4	8	#include "tag.h"
d1af002d	9	#include "delta.h"
ff5ebe39 DB	10
ff5ebe39 DB	11	#define REACHABLE 0x0001
d9839e03	12
ab7df187	13	static int show_root = 0;
889262ea	14	static int show_tags = 0;
d9839e03	15	static int show_unreachable = 0;
d1af002d	16	static int show_max_delta_depth = 0;
ae7c0c92	17	static int keep_cache_objects = 0;
d9839e03 LT	18	static unsigned char head_sha1[20];
d9839e03 LT	19
d1af002d NP	20	static void expand_deltas(void)
	21	{
	22	int i, max_depth = 0;
	23
	24	/*
	25	* To be as efficient as possible we look for delta heads and
	26	* recursively process them going backward, and parsing
	27	* resulting objects along the way. This allows for processing
	28	* each delta objects only once regardless of the delta depth.
	29	*/
	30	for (i = 0; i < nr_objs; i++) {
	31	struct object *obj = objs[i];
	32	if (obj->parsed && !obj->delta && obj->attached_deltas) {
	33	int depth = 0;
	34	char type[10];
	35	unsigned long size;
	36	void *buf = read_sha1_file(obj->sha1, type, &size);
	37	if (!buf)
	38	continue;
	39	depth = process_deltas(buf, size, obj->type,
	40	obj->attached_deltas);
	41	if (max_depth < depth)
	42	max_depth = depth;
	43	}
	44	}
	45	if (show_max_delta_depth)
	46	printf("maximum delta depth = %d\n", max_depth);
	47	}
	48
8ba0bbb2 LT	49	static void check_connectivity(void)
	50	{
	51	int i;
	52
8ba0bbb2	53	/* Look up all the requirements, warn about missing objects.. */
ff5ebe39 DB	54	for (i = 0; i < nr_objs; i++) {
ff5ebe39 DB	55	struct object *obj = objs[i];
c418eda4	56	struct object_list *refs;
8ba0bbb2	57
3a6a23e6	58	if (!obj->parsed) {
d1af002d NP	59	if (obj->delta)
	60	printf("unresolved delta %s\n",
	61	sha1_to_hex(obj->sha1));
	62	else
	63	printf("missing %s %s\n",
	64	obj->type, sha1_to_hex(obj->sha1));
3a6a23e6 LT	65	continue;
	66	}
	67
	68	for (refs = obj->refs; refs; refs = refs->next) {
	69	if (refs->item->parsed)
	70	continue;
	71	printf("broken link from %7s %s\n",
	72	obj->type, sha1_to_hex(obj->sha1));
	73	printf(" to %7s %s\n",
aa034134	74	refs->item->type, sha1_to_hex(refs->item->sha1));
3a6a23e6 LT	75	}
	76
	77	/* Don't bother with tag reachability. */
	78	if (obj->type == tag_type)
	79	continue;
	80
ff5ebe39	81	if (show_unreachable && !(obj->flags & REACHABLE)) {
d1af002d NP	82	if (obj->attached_deltas)
	83	printf("foreign delta reference %s\n",
	84	sha1_to_hex(obj->sha1));
	85	else
	86	printf("unreachable %s %s\n",
	87	obj->type, sha1_to_hex(obj->sha1));
8ba0bbb2	88	continue;
d9839e03	89	}
8ba0bbb2	90
ff5ebe39 DB	91	if (!obj->used) {
	92	printf("dangling %s %s\n", obj->type,
	93	sha1_to_hex(obj->sha1));
d9839e03	94	}
8ba0bbb2 LT	95	}
	96	}
	97
85003492 LT	98	/*
	99	* The entries in a tree are ordered in the _path_ order,
	100	* which means that a directory entry is ordered by adding
	101	* a slash to the end of it.
	102	*
	103	* So a directory called "a" is ordered _after_ a file
	104	* called "a.c", because "a/" sorts after "a.c".
	105	*/
a4f35a2d JH	106	#define TREE_UNORDERED (-1)
	107	#define TREE_HAS_DUPS (-2)
	108
85003492 LT	109	static int verify_ordered(struct tree_entry_list a, struct tree_entry_list b)
	110	{
	111	int len1 = strlen(a->name);
	112	int len2 = strlen(b->name);
	113	int len = len1 < len2 ? len1 : len2;
	114	unsigned char c1, c2;
	115	int cmp;
	116
	117	cmp = memcmp(a->name, b->name, len);
	118	if (cmp < 0)
	119	return 0;
	120	if (cmp > 0)
a4f35a2d	121	return TREE_UNORDERED;
85003492 LT	122
	123	/*
	124	* Ok, the first <len> characters are the same.
	125	* Now we need to order the next one, but turn
	126	* a '\0' into a '/' for a directory entry.
	127	*/
	128	c1 = a->name[len];
	129	c2 = b->name[len];
a4f35a2d JH	130	if (!c1 && !c2)
	131	/*
	132	* git-write-tree used to write out a nonsense tree that has
	133	* entries with the same name, one blob and one tree. Make
	134	* sure we do not have duplicate entries.
	135	*/
	136	return TREE_HAS_DUPS;
85003492 LT	137	if (!c1 && a->directory)
	138	c1 = '/';
	139	if (!c2 && b->directory)
	140	c2 = '/';
a4f35a2d	141	return c1 < c2 ? 0 : TREE_UNORDERED;
85003492 LT	142	}
85003492 LT	143
c418eda4	144	static int fsck_tree(struct tree *item)
20222118	145	{
85003492 LT	146	int has_full_path = 0;
	147	struct tree_entry_list entry, last;
	148
	149	last = NULL;
	150	for (entry = item->entries; entry; entry = entry->next) {
	151	if (strchr(entry->name, '/'))
	152	has_full_path = 1;
	153
42ea9cb2 LT	154	switch (entry->mode) {
	155	/*
	156	* Standard modes..
	157	*/
	158	case S_IFREG \| 0755:
	159	case S_IFREG \| 0644:
	160	case S_IFLNK:
	161	case S_IFDIR:
	162	break;
	163	/*
	164	* This is nonstandard, but we had a few of these
	165	* early on when we honored the full set of mode
	166	* bits..
	167	*/
	168	case S_IFREG \| 0664:
	169	break;
	170	default:
	171	printf("tree %s has entry %o %s\n",
	172	sha1_to_hex(item->object.sha1),
	173	entry->mode, entry->name);
	174	}
	175
85003492	176	if (last) {
a4f35a2d JH	177	switch (verify_ordered(last, entry)) {
a4f35a2d JH	178	case TREE_UNORDERED:
85003492 LT	179	fprintf(stderr, "tree %s not ordered\n",
	180	sha1_to_hex(item->object.sha1));
	181	return -1;
a4f35a2d JH	182	case TREE_HAS_DUPS:
	183	fprintf(stderr, "tree %s has duplicate entries for '%s'\n",
	184	sha1_to_hex(item->object.sha1),
	185	entry->name);
	186	return -1;
	187	default:
	188	break;
85003492 LT	189	}
	190	}
	191
	192	last = entry;
	193	}
	194
	195	if (has_full_path) {
667bb59b	196	fprintf(stderr, "warning: git-fsck-cache: tree %s "
c418eda4 DB	197	"has full pathnames in it\n",
c418eda4 DB	198	sha1_to_hex(item->object.sha1));
1ea34e36	199	}
85003492	200
59c1e249	201	return 0;
1ea34e36 LT	202	}
1ea34e36 LT	203
c418eda4	204	static int fsck_commit(struct commit *commit)
1ea34e36	205	{
bd1e17e2 LT	206	free(commit->buffer);
bd1e17e2 LT	207	commit->buffer = NULL;
ff5ebe39	208	if (!commit->tree)
1ea34e36	209	return -1;
ab7df187	210	if (!commit->parents && show_root)
c418eda4	211	printf("root %s\n", sha1_to_hex(commit->object.sha1));
e6948b6d	212	if (!commit->date)
c418eda4 DB	213	printf("bad commit date in %s\n",
c418eda4 DB	214	sha1_to_hex(commit->object.sha1));
4728b861 LT	215	return 0;
	216	}
	217
c418eda4	218	static int fsck_tag(struct tag *tag)
ec4465ad	219	{
92d4c85d LT	220	struct object *tagged = tag->tagged;
	221
	222	if (!tagged) {
	223	printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
	224	return -1;
	225	}
889262ea LT	226	if (!show_tags)
	227	return 0;
	228
92d4c85d LT	229	printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
92d4c85d LT	230	printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
ff5ebe39	231	return 0;
20222118 LT	232	}
20222118 LT	233
7e8c174a	234	static int fsck_sha1(unsigned char *sha1)
20222118	235	{
7e8c174a LT	236	struct object *obj = parse_object(sha1);
	237	if (!obj)
	238	return -1;
	239	if (obj->type == blob_type)
	240	return 0;
	241	if (obj->type == tree_type)
	242	return fsck_tree((struct tree *) obj);
	243	if (obj->type == commit_type)
	244	return fsck_commit((struct commit *) obj);
	245	if (obj->type == tag_type)
	246	return fsck_tag((struct tag *) obj);
d1af002d NP	247	if (!obj->type && obj->delta)
d1af002d NP	248	return 0;
7e8c174a LT	249	return -1;
	250	}
	251
	252	/*
	253	* This is the sorting chunk size: make it reasonably
	254	* big so that we can sort well..
	255	*/
	256	#define MAX_SHA1_ENTRIES (1024)
	257
	258	struct sha1_entry {
	259	unsigned long ino;
20222118	260	unsigned char sha1[20];
7e8c174a LT	261	};
	262
	263	static struct {
	264	unsigned long nr;
	265	struct sha1_entry *entry[MAX_SHA1_ENTRIES];
	266	} sha1_list;
	267
	268	static int ino_compare(const void _a, const void _b)
	269	{
	270	const struct sha1_entry a = _a, b = _b;
	271	unsigned long ino1 = a->ino, ino2 = b->ino;
	272	return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
	273	}
	274
	275	static void fsck_sha1_list(void)
	276	{
	277	int i, nr = sha1_list.nr;
	278
	279	qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
	280	for (i = 0; i < nr; i++) {
	281	struct sha1_entry *entry = sha1_list.entry[i];
	282	unsigned char *sha1 = entry->sha1;
	283
	284	sha1_list.entry[i] = NULL;
	285	if (fsck_sha1(sha1) < 0)
	286	fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
	287	free(entry);
20222118	288	}
7e8c174a LT	289	sha1_list.nr = 0;
	290	}
	291
	292	static void add_sha1_list(unsigned char *sha1, unsigned long ino)
	293	{
	294	struct sha1_entry entry = xmalloc(sizeof(entry));
	295	int nr;
	296
	297	entry->ino = ino;
	298	memcpy(entry->sha1, sha1, 20);
	299	nr = sha1_list.nr;
	300	if (nr == MAX_SHA1_ENTRIES) {
	301	fsck_sha1_list();
	302	nr = 0;
	303	}
	304	sha1_list.entry[nr] = entry;
	305	sha1_list.nr = ++nr;
20222118 LT	306	}
	307
	308	static int fsck_dir(int i, char *path)
	309	{
	310	DIR *dir = opendir(path);
	311	struct dirent *de;
	312
	313	if (!dir) {
2de381f9	314	return error("missing sha1 directory '%s'", path);
20222118 LT	315	}
	316
	317	while ((de = readdir(dir)) != NULL) {
	318	char name[100];
7e8c174a	319	unsigned char sha1[20];
20222118 LT	320	int len = strlen(de->d_name);
	321
	322	switch (len) {
	323	case 2:
	324	if (de->d_name[1] != '.')
	325	break;
	326	case 1:
	327	if (de->d_name[0] != '.')
	328	break;
	329	continue;
	330	case 38:
	331	sprintf(name, "%02x", i);
	332	memcpy(name+2, de->d_name, len+1);
7e8c174a LT	333	if (get_sha1_hex(name, sha1) < 0)
	334	break;
	335	add_sha1_list(sha1, de->d_ino);
	336	continue;
20222118 LT	337	}
	338	fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	339	}
	340	closedir(dir);
	341	return 0;
	342	}
	343
7c4d07c7	344	static int read_sha1_reference(const char *path)
1024932f LT	345	{
	346	char hexname[60];
	347	unsigned char sha1[20];
	348	int fd = open(path, O_RDONLY), len;
	349	struct object *obj;
	350
	351	if (fd < 0)
7c4d07c7	352	return -1;
1024932f LT	353
	354	len = read(fd, hexname, sizeof(hexname));
	355	close(fd);
	356	if (len < 40)
7c4d07c7	357	return -1;
1024932f LT	358
1024932f LT	359	if (get_sha1_hex(hexname, sha1) < 0)
7c4d07c7	360	return -1;
1024932f LT	361
1024932f LT	362	obj = lookup_object(sha1);
7c4d07c7 LT	363	if (!obj)
	364	return error("%s: invalid sha1 pointer %.40s", path, hexname);
	365
1024932f LT	366	obj->used = 1;
1024932f LT	367	mark_reachable(obj, REACHABLE);
7c4d07c7	368	return 0;
1024932f LT	369	}
1024932f LT	370
477606f5	371	static int find_file_objects(const char base, const char name)
1024932f LT	372	{
	373	int baselen = strlen(base);
	374	int namelen = strlen(name);
	375	char *path = xmalloc(baselen + namelen + 2);
	376	struct stat st;
	377
	378	memcpy(path, base, baselen);
	379	path[baselen] = '/';
	380	memcpy(path + baselen + 1, name, namelen+1);
	381	if (stat(path, &st) < 0)
477606f5	382	return 0;
1024932f LT	383
	384	/*
	385	* Recurse into directories
	386	*/
	387	if (S_ISDIR(st.st_mode)) {
477606f5	388	int count = 0;
1024932f LT	389	DIR *dir = opendir(path);
	390	if (dir) {
	391	struct dirent *de;
	392	while ((de = readdir(dir)) != NULL) {
	393	if (de->d_name[0] == '.')
	394	continue;
477606f5	395	count += find_file_objects(path, de->d_name);
1024932f LT	396	}
	397	closedir(dir);
	398	}
477606f5	399	return count;
1024932f	400	}
477606f5 LT	401	if (S_ISREG(st.st_mode))
	402	return read_sha1_reference(path) == 0;
	403	return 0;
1024932f LT	404	}
	405
	406	static void get_default_heads(void)
	407	{
	408	char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
477606f5 LT	409	int count = find_file_objects(git_dir, "refs");
	410	if (!count)
	411	die("No default references");
1024932f LT	412	}
1024932f LT	413
20222118 LT	414	int main(int argc, char **argv)
20222118 LT	415	{
bcee6fd8	416	int i, heads;
20222118 LT	417	char *sha1_dir;
20222118 LT	418
889262ea LT	419	for (i = 1; i < argc; i++) {
	420	const char *arg = argv[i];
	421
	422	if (!strcmp(arg, "--unreachable")) {
	423	show_unreachable = 1;
	424	continue;
	425	}
	426	if (!strcmp(arg, "--tags")) {
	427	show_tags = 1;
	428	continue;
	429	}
ab7df187 LT	430	if (!strcmp(arg, "--root")) {
	431	show_root = 1;
	432	continue;
	433	}
d1af002d NP	434	if (!strcmp(arg, "--delta-depth")) {
	435	show_max_delta_depth = 1;
	436	continue;
	437	}
ae7c0c92 JH	438	if (!strcmp(arg, "--cache")) {
	439	keep_cache_objects = 1;
	440	continue;
	441	}
889262ea	442	if (*arg == '-')
667bb59b	443	usage("git-fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
889262ea LT	444	}
889262ea LT	445
ace1534d	446	sha1_dir = get_object_directory();
bcee6fd8 LT	447	for (i = 0; i < 256; i++) {
	448	static char dir[4096];
	449	sprintf(dir, "%s/%02x", sha1_dir, i);
	450	fsck_dir(i, dir);
	451	}
7e8c174a	452	fsck_sha1_list();
bcee6fd8	453
d1af002d NP	454	expand_deltas();
d1af002d NP	455
bcee6fd8	456	heads = 0;
d9839e03	457	for (i = 1; i < argc; i++) {
889262ea LT	458	const char *arg = argv[i];
	459
	460	if (*arg == '-')
d9839e03	461	continue;
889262ea	462
3c249c95	463	if (!get_sha1(arg, head_sha1)) {
770896e5	464	struct object *obj = lookup_object(head_sha1);
e1a1388d	465
770896e5 LT	466	/* Error is printed by lookup_object(). */
770896e5 LT	467	if (!obj)
e1a1388d JF	468	continue;
e1a1388d JF	469
ff5ebe39 DB	470	obj->used = 1;
ff5ebe39 DB	471	mark_reachable(obj, REACHABLE);
bcee6fd8	472	heads++;
d9839e03 LT	473	continue;
d9839e03 LT	474	}
889262ea	475	error("expected sha1, got %s", arg);
d9839e03	476	}
d9839e03	477
1024932f	478	/*
d1af002d	479	* If we've not been given any explicit head information, do the
e7bd907d LT	480	* default ones from .git/refs. We also consider the index file
e7bd907d LT	481	* in this case (ie this implies --cache).
1024932f	482	*/
e7bd907d	483	if (!heads) {
1024932f LT	484	get_default_heads();
	485	keep_cache_objects = 1;
	486	}
	487
ae7c0c92 JH	488	if (keep_cache_objects) {
	489	int i;
	490	read_cache();
	491	for (i = 0; i < active_nr; i++) {
	492	struct blob *blob = lookup_blob(active_cache[i]->sha1);
	493	struct object *obj;
	494	if (!blob)
	495	continue;
	496	obj = &blob->object;
	497	obj->used = 1;
	498	mark_reachable(obj, REACHABLE);
	499	}
	500	}
	501
8ba0bbb2	502	check_connectivity();
20222118 LT	503	return 0;
20222118 LT	504	}