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

#include "cache.h"

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

#include "commit.h"
#include "tree.h"
#include "blob.h"

#define REACHABLE 0x0001

static int show_unreachable = 0;
static unsigned char head_sha1[20];

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];

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

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

static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
{
	struct tree *item = lookup_tree(sha1);
	if (parse_tree(item))
		return -1;
	if (item->has_full_path) {
		fprintf(stderr, "warning: fsck-cache: tree %s "
			"has full pathnames in it\n", sha1_to_hex(sha1));
	}
	return 0;
}

static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
{
	struct commit *commit = lookup_commit(sha1);
	if (parse_commit(commit))
		return -1;
	if (!commit->tree)
		return -1;
	if (!commit->parents)
		printf("root %s\n", sha1_to_hex(sha1));
	if (!commit->date)
		printf("bad commit date in %s\n", sha1_to_hex(sha1));
	return 0;
}

static int fsck_blob(unsigned char *sha1, void *data, unsigned long size)
{
	struct blob *blob = lookup_blob(sha1);
	blob->object.parsed = 1;
	return 0;
}

static int fsck_tag(unsigned char *sha1, void *data, unsigned long size)
{
	int typelen, taglen;
	unsigned char object[20];
	char object_hex[60];
	const char *type_line, *tag_line, *sig_line;

	if (size < 64)
		return -1;
	if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
		return -1;

	type_line = data + 48;
	if (memcmp("\ntype ", type_line-1, 6))
		return -1;

	tag_line = strchr(type_line, '\n');
	if (!tag_line || memcmp("tag ", ++tag_line, 4))
		return -1;

	sig_line = strchr(tag_line, '\n');
	if (!sig_line)
		return -1;
	sig_line++;

	typelen = tag_line - type_line - strlen("type \n");
	if (typelen >= 20)
		return -1;
	taglen = sig_line - tag_line - strlen("tag \n");

	strcpy(object_hex, sha1_to_hex(object));
	printf("tagged %.*s %s (%.*s) in %s\n",
		typelen, type_line + 5,
		object_hex,
		taglen, tag_line + 4,
		sha1_to_hex(sha1));
	return 0;
}

static int fsck_entry(unsigned char *sha1, char *tag, void *data, 
		      unsigned long size)
{
	if (!strcmp(tag, "blob")) {
		if (fsck_blob(sha1, data, size) < 0)
			return -1;
	} else if (!strcmp(tag, "tree")) {
		if (fsck_tree(sha1, data, size) < 0)
			return -1;
	} else if (!strcmp(tag, "commit")) {
		if (fsck_commit(sha1, data, size) < 0)
			return -1;
	} else if (!strcmp(tag, "tag")) {
		if (fsck_tag(sha1, data, size) < 0)
			return -1;
	} else
		return -1;
	return 0;
}

static int fsck_name(char *hex)
{
	unsigned char sha1[20];
	if (!get_sha1_hex(hex, sha1)) {
		unsigned long mapsize;
		void *map = map_sha1_file(sha1, &mapsize);
		if (map) {
			char type[100];
			unsigned long size;
			void *buffer = unpack_sha1_file(map, mapsize, type, &size);
			if (!buffer)
				return -1;
			if (check_sha1_signature(sha1, buffer, size, type) < 0)
				printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
			munmap(map, mapsize);
			if (!fsck_entry(sha1, type, buffer, size))
				return 0;
		}
	}
	return -1;
}

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];
		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 (!fsck_name(name))
				continue;
		}
		fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	}
	closedir(dir);
	return 0;
}

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

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

	heads = 0;
	for (i = 1; i < argc; i++) {
		if (!strcmp(argv[i], "--unreachable")) {
			show_unreachable = 1;
			continue;
		}
		if (!get_sha1_hex(argv[i], head_sha1)) {
			struct object *obj = &lookup_commit(head_sha1)->object;
			obj->used = 1;
			mark_reachable(obj, REACHABLE);
			heads++;
			continue;
		}
		error("fsck-cache [[--unreachable] <head-sha1>*]");
	}

	if (!heads) {
		if (show_unreachable) {
			fprintf(stderr, "unable to do reachability without a head\n");
			show_unreachable = 0; 
		}
		fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
	}

	check_connectivity();
	return 0;
}
Commit	Line	Data
20222118 LT	1	#include "cache.h"
	2
	3	#include <sys/types.h>
	4	#include <dirent.h>
	5
ff5ebe39 DB	6	#include "commit.h"
	7	#include "tree.h"
	8	#include "blob.h"
	9
	10	#define REACHABLE 0x0001
d9839e03 LT	11
d9839e03 LT	12	static int show_unreachable = 0;
d9839e03 LT	13	static unsigned char head_sha1[20];
d9839e03 LT	14
8ba0bbb2 LT	15	static void check_connectivity(void)
	16	{
	17	int i;
	18
8ba0bbb2	19	/* Look up all the requirements, warn about missing objects.. */
ff5ebe39 DB	20	for (i = 0; i < nr_objs; i++) {
ff5ebe39 DB	21	struct object *obj = objs[i];
8ba0bbb2	22
ff5ebe39	23	if (show_unreachable && !(obj->flags & REACHABLE)) {
f43b8abc	24	printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
8ba0bbb2	25	continue;
d9839e03	26	}
8ba0bbb2	27
ff5ebe39 DB	28	if (!obj->parsed) {
	29	printf("missing %s %s\n", obj->type,
	30	sha1_to_hex(obj->sha1));
	31	}
	32	if (!obj->used) {
	33	printf("dangling %s %s\n", obj->type,
	34	sha1_to_hex(obj->sha1));
d9839e03	35	}
8ba0bbb2 LT	36	}
	37	}
	38
1ea34e36	39	static int fsck_tree(unsigned char sha1, void data, unsigned long size)
20222118	40	{
ff5ebe39 DB	41	struct tree *item = lookup_tree(sha1);
	42	if (parse_tree(item))
	43	return -1;
	44	if (item->has_full_path) {
	45	fprintf(stderr, "warning: fsck-cache: tree %s "
	46	"has full pathnames in it\n", sha1_to_hex(sha1));
1ea34e36	47	}
59c1e249	48	return 0;
1ea34e36 LT	49	}
	50
	51	static int fsck_commit(unsigned char sha1, void data, unsigned long size)
	52	{
ff5ebe39 DB	53	struct commit *commit = lookup_commit(sha1);
ff5ebe39 DB	54	if (parse_commit(commit))
1ea34e36	55	return -1;
ff5ebe39	56	if (!commit->tree)
1ea34e36	57	return -1;
ff5ebe39	58	if (!commit->parents)
d9839e03	59	printf("root %s\n", sha1_to_hex(sha1));
e6948b6d LT	60	if (!commit->date)
e6948b6d LT	61	printf("bad commit date in %s\n", sha1_to_hex(sha1));
59c1e249	62	return 0;
20222118 LT	63	}
20222118 LT	64
4728b861 LT	65	static int fsck_blob(unsigned char sha1, void data, unsigned long size)
	66	{
	67	struct blob *blob = lookup_blob(sha1);
	68	blob->object.parsed = 1;
	69	return 0;
	70	}
	71
ec4465ad LT	72	static int fsck_tag(unsigned char sha1, void data, unsigned long size)
	73	{
	74	int typelen, taglen;
	75	unsigned char object[20];
56ce69f7	76	char object_hex[60];
ec4465ad LT	77	const char type_line, tag_line, *sig_line;
	78
	79	if (size < 64)
	80	return -1;
	81	if (memcmp("object ", data, 7) \|\| get_sha1_hex(data + 7, object))
	82	return -1;
	83
	84	type_line = data + 48;
	85	if (memcmp("\ntype ", type_line-1, 6))
	86	return -1;
	87
	88	tag_line = strchr(type_line, '\n');
	89	if (!tag_line \|\| memcmp("tag ", ++tag_line, 4))
	90	return -1;
	91
	92	sig_line = strchr(tag_line, '\n');
	93	if (!sig_line)
	94	return -1;
	95	sig_line++;
	96
	97	typelen = tag_line - type_line - strlen("type \n");
	98	if (typelen >= 20)
	99	return -1;
	100	taglen = sig_line - tag_line - strlen("tag \n");
	101
56ce69f7 LT	102	strcpy(object_hex, sha1_to_hex(object));
56ce69f7 LT	103	printf("tagged %.s %s (%.s) in %s\n",
ec4465ad	104	typelen, type_line + 5,
56ce69f7 LT	105	object_hex,
	106	taglen, tag_line + 4,
	107	sha1_to_hex(sha1));
ec4465ad LT	108	return 0;
	109	}
	110
ff5ebe39 DB	111	static int fsck_entry(unsigned char sha1, char tag, void *data,
ff5ebe39 DB	112	unsigned long size)
20222118	113	{
1ea34e36	114	if (!strcmp(tag, "blob")) {
4728b861 LT	115	if (fsck_blob(sha1, data, size) < 0)
4728b861 LT	116	return -1;
1ea34e36 LT	117	} else if (!strcmp(tag, "tree")) {
	118	if (fsck_tree(sha1, data, size) < 0)
	119	return -1;
	120	} else if (!strcmp(tag, "commit")) {
	121	if (fsck_commit(sha1, data, size) < 0)
	122	return -1;
ec4465ad LT	123	} else if (!strcmp(tag, "tag")) {
	124	if (fsck_tag(sha1, data, size) < 0)
	125	return -1;
1ea34e36	126	} else
20222118	127	return -1;
ff5ebe39	128	return 0;
20222118 LT	129	}
	130
	131	static int fsck_name(char *hex)
	132	{
	133	unsigned char sha1[20];
	134	if (!get_sha1_hex(hex, sha1)) {
	135	unsigned long mapsize;
	136	void *map = map_sha1_file(sha1, &mapsize);
	137	if (map) {
	138	char type[100];
	139	unsigned long size;
d98b46f8 LT	140	void *buffer = unpack_sha1_file(map, mapsize, type, &size);
	141	if (!buffer)
	142	return -1;
	143	if (check_sha1_signature(sha1, buffer, size, type) < 0)
	144	printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
20222118	145	munmap(map, mapsize);
d98b46f8	146	if (!fsck_entry(sha1, type, buffer, size))
20222118 LT	147	return 0;
	148	}
	149	}
	150	return -1;
	151	}
	152
	153	static int fsck_dir(int i, char *path)
	154	{
	155	DIR *dir = opendir(path);
	156	struct dirent *de;
	157
	158	if (!dir) {
2de381f9	159	return error("missing sha1 directory '%s'", path);
20222118 LT	160	}
	161
	162	while ((de = readdir(dir)) != NULL) {
	163	char name[100];
	164	int len = strlen(de->d_name);
	165
	166	switch (len) {
	167	case 2:
	168	if (de->d_name[1] != '.')
	169	break;
	170	case 1:
	171	if (de->d_name[0] != '.')
	172	break;
	173	continue;
	174	case 38:
	175	sprintf(name, "%02x", i);
	176	memcpy(name+2, de->d_name, len+1);
	177	if (!fsck_name(name))
	178	continue;
	179	}
	180	fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	181	}
	182	closedir(dir);
	183	return 0;
	184	}
	185
	186	int main(int argc, char **argv)
	187	{
bcee6fd8	188	int i, heads;
20222118 LT	189	char *sha1_dir;
20222118 LT	190
bcee6fd8 LT	191	sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
	192	for (i = 0; i < 256; i++) {
	193	static char dir[4096];
	194	sprintf(dir, "%s/%02x", sha1_dir, i);
	195	fsck_dir(i, dir);
	196	}
	197
	198	heads = 0;
d9839e03 LT	199	for (i = 1; i < argc; i++) {
	200	if (!strcmp(argv[i], "--unreachable")) {
	201	show_unreachable = 1;
	202	continue;
	203	}
	204	if (!get_sha1_hex(argv[i], head_sha1)) {
b51ad431	205	struct object *obj = &lookup_commit(head_sha1)->object;
ff5ebe39 DB	206	obj->used = 1;
ff5ebe39 DB	207	mark_reachable(obj, REACHABLE);
bcee6fd8	208	heads++;
d9839e03 LT	209	continue;
d9839e03 LT	210	}
bcee6fd8	211	error("fsck-cache [[--unreachable] <head-sha1>*]");
d9839e03	212	}
d9839e03	213
bcee6fd8 LT	214	if (!heads) {
	215	if (show_unreachable) {
	216	fprintf(stderr, "unable to do reachability without a head\n");
	217	show_unreachable = 0;
	218	}
	219	fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
20222118	220	}
bcee6fd8	221
8ba0bbb2	222	check_connectivity();
20222118 LT	223	return 0;
20222118 LT	224	}