[thirdparty/git.git] / update-index.c

/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"

/*
 * Default to not allowing changes to the list of files. The
 * tool doesn't actually care, but this makes it harder to add
 * files to the revision control by mistake by doing something
 * like "git-update-index *" and suddenly having all the object
 * files be revision controlled.
 */
static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
static int force_remove;

/* Three functions to allow overloaded pointer return; see linux/err.h */
static inline void *ERR_PTR(long error)
{
	return (void *) error;
}

static inline long PTR_ERR(const void *ptr)
{
	return (long) ptr;
}

static inline long IS_ERR(const void *ptr)
{
	return (unsigned long)ptr > (unsigned long)-1000L;
}

static int add_file_to_cache(const char *path)
{
	int size, namelen, option, status;
	struct cache_entry *ce;
	struct stat st;
	int fd;
	char *target;

	status = lstat(path, &st);
	if (status < 0 || S_ISDIR(st.st_mode)) {
		/* When we used to have "path" and now we want to add
		 * "path/file", we need a way to remove "path" before
		 * being able to add "path/file".  However,
		 * "git-update-index --remove path" would not work.
		 * --force-remove can be used but this is more user
		 * friendly, especially since we can do the opposite
		 * case just fine without --force-remove.
		 */
		if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
			if (allow_remove) {
				if (remove_file_from_cache(path))
					return error("%s: cannot remove from the index",
					             path);
				else
					return 0;
			} else if (status < 0) {
				return error("%s: does not exist and --remove not passed",
				             path);
			}
		}
		if (0 == status)
			return error("%s: is a directory - add files inside instead",
			             path);
		else
			return error("lstat(\"%s\"): %s", path,
				     strerror(errno));
	}
	namelen = strlen(path);
	size = cache_entry_size(namelen);
	ce = xmalloc(size);
	memset(ce, 0, size);
	memcpy(ce->name, path, namelen);
	fill_stat_cache_info(ce, &st);
	ce->ce_mode = create_ce_mode(st.st_mode);
	ce->ce_flags = htons(namelen);
	switch (st.st_mode & S_IFMT) {
	case S_IFREG:
		fd = open(path, O_RDONLY);
		if (fd < 0)
			return error("open(\"%s\"): %s", path, strerror(errno));
		if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
			return error("%s: failed to insert into database", path);
		break;
	case S_IFLNK:
		target = xmalloc(st.st_size+1);
		if (readlink(path, target, st.st_size+1) != st.st_size) {
			char *errstr = strerror(errno);
			free(target);
			return error("readlink(\"%s\"): %s", path,
			             errstr);
		}
		if (info_only) {
			unsigned char hdr[50];
			int hdrlen;
			write_sha1_file_prepare(target, st.st_size, "blob",
						ce->sha1, hdr, &hdrlen);
		} else if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
			return error("%s: failed to insert into database", path);
		free(target);
		break;
	default:
		return error("%s: unsupported file type", path);
	}
	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
	option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
	if (add_cache_entry(ce, option))
		return error("%s: cannot add to the index - missing --add option?",
			     path);
	return 0;
}

/*
 * "refresh" does not calculate a new sha1 file or bring the
 * cache up-to-date for mode/content changes. But what it
 * _does_ do is to "re-match" the stat information of a file
 * with the cache, so that you can refresh the cache for a
 * file that hasn't been changed but where the stat entry is
 * out of date.
 *
 * For example, you'd want to do this after doing a "git-read-tree",
 * to link up the stat cache details with the proper files.
 */
static struct cache_entry *refresh_entry(struct cache_entry *ce)
{
	struct stat st;
	struct cache_entry *updated;
	int changed, size;

	if (lstat(ce->name, &st) < 0)
		return ERR_PTR(-errno);

	changed = ce_match_stat(ce, &st);
	if (!changed)
		return ce;

	if (ce_modified(ce, &st))
		return ERR_PTR(-EINVAL);

	size = ce_size(ce);
	updated = xmalloc(size);
	memcpy(updated, ce, size);
	fill_stat_cache_info(updated, &st);
	return updated;
}

static int refresh_cache(void)
{
	int i;
	int has_errors = 0;

	for (i = 0; i < active_nr; i++) {
		struct cache_entry *ce, *new;
		ce = active_cache[i];
		if (ce_stage(ce)) {
			printf("%s: needs merge\n", ce->name);
			has_errors = 1;
			while ((i < active_nr) &&
			       ! strcmp(active_cache[i]->name, ce->name))
				i++;
			i--;
			continue;
		}

		new = refresh_entry(ce);
		if (IS_ERR(new)) {
			if (not_new && PTR_ERR(new) == -ENOENT)
				continue;
			if (quiet)
				continue;
			printf("%s: needs update\n", ce->name);
			has_errors = 1;
			continue;
		}
		active_cache_changed = 1;
		/* You can NOT just free active_cache[i] here, since it
		 * might not be necessarily malloc()ed but can also come
		 * from mmap(). */
		active_cache[i] = new;
	}
	return has_errors;
}

/*
 * We fundamentally don't like some paths: we don't want
 * dot or dot-dot anywhere, and for obvious reasons don't
 * want to recurse into ".git" either.
 *
 * Also, we don't want double slashes or slashes at the
 * end that can make pathnames ambiguous.
 */
static int verify_dotfile(const char *rest)
{
	/*
	 * The first character was '.', but that
	 * has already been discarded, we now test
	 * the rest.
	 */
	switch (*rest) {
	/* "." is not allowed */
	case '\0': case '/':
		return 0;

	/*
	 * ".git" followed by  NUL or slash is bad. This
	 * shares the path end test with the ".." case.
	 */
	case 'g':
		if (rest[1] != 'i')
			break;
		if (rest[2] != 't')
			break;
		rest += 2;
	/* fallthrough */
	case '.':
		if (rest[1] == '\0' || rest[1] == '/')
			return 0;
	}
	return 1;
}

static int verify_path(const char *path)
{
	char c;

	goto inside;
	for (;;) {
		if (!c)
			return 1;
		if (c == '/') {
inside:
			c = *path++;
			switch (c) {
			default:
				continue;
			case '/': case '\0':
				break;
			case '.':
				if (verify_dotfile(path))
					continue;
			}
			return 0;
		}
		c = *path++;
	}
}

static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3)
{
	int size, len, option;
	unsigned int mode;
	unsigned char sha1[20];
	struct cache_entry *ce;

	if (sscanf(arg1, "%o", &mode) != 1)
		return -1;
	if (get_sha1_hex(arg2, sha1))
		return -1;
	if (!verify_path(arg3))
		return -1;

	len = strlen(arg3);
	size = cache_entry_size(len);
	ce = xmalloc(size);
	memset(ce, 0, size);

	memcpy(ce->sha1, sha1, 20);
	memcpy(ce->name, arg3, len);
	ce->ce_flags = htons(len);
	ce->ce_mode = create_ce_mode(mode);
	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
	option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
	return add_cache_entry(ce, option);
}

static struct cache_file cache_file;

int main(int argc, const char **argv)
{
	int i, newfd, entries, has_errors = 0;
	int allow_options = 1;
	const char *prefix = setup_git_directory();

	newfd = hold_index_file_for_update(&cache_file, get_index_file());
	if (newfd < 0)
		die("unable to create new cachefile");

	entries = read_cache();
	if (entries < 0)
		die("cache corrupted");

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

		if (allow_options && *path == '-') {
			if (!strcmp(path, "--")) {
				allow_options = 0;
				continue;
			}
			if (!strcmp(path, "-q")) {
				quiet = 1;
				continue;
			}
			if (!strcmp(path, "--add")) {
				allow_add = 1;
				continue;
			}
			if (!strcmp(path, "--replace")) {
				allow_replace = 1;
				continue;
			}
			if (!strcmp(path, "--remove")) {
				allow_remove = 1;
				continue;
			}
			if (!strcmp(path, "--refresh")) {
				has_errors |= refresh_cache();
				continue;
			}
			if (!strcmp(path, "--cacheinfo")) {
				if (i+3 >= argc)
					die("git-update-index: --cacheinfo <mode> <sha1> <path>");
				if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
					die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
				i += 3;
				continue;
			}
			if (!strcmp(path, "--info-only")) {
				info_only = 1;
				continue;
			}
			if (!strcmp(path, "--force-remove")) {
				force_remove = 1;
				continue;
			}

			if (!strcmp(path, "--ignore-missing")) {
				not_new = 1;
				continue;
			}
			die("unknown option %s", path);
		}
		path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
		if (!verify_path(path)) {
			fprintf(stderr, "Ignoring path %s\n", argv[i]);
			continue;
		}
		if (force_remove) {
			if (remove_file_from_cache(path))
				die("git-update-index: unable to remove %s", path);
			continue;
		}
		if (add_file_to_cache(path))
			die("Unable to process file %s", path);
	}
	if (write_cache(newfd, active_cache, active_nr) ||
	    commit_index_file(&cache_file))
		die("Unable to write new cachefile");

	return has_errors ? 1 : 0;
}
Commit	Line	Data
8bc9a0c7 LT	1	/*
	2	* GIT - The information manager from hell
	3	*
	4	* Copyright (C) Linus Torvalds, 2005
	5	*/
e83c5163 LT	6	#include "cache.h"
e83c5163 LT	7
121481ab LT	8	/*
	9	* Default to not allowing changes to the list of files. The
	10	* tool doesn't actually care, but this makes it harder to add
	11	* files to the revision control by mistake by doing something
215a7ad1	12	* like "git-update-index *" and suddenly having all the object
121481ab LT	13	* files be revision controlled.
121481ab LT	14	*/
df6e1516	15	static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
9b63f501	16	static int force_remove;
c6e007b0 JB	17
	18	/* Three functions to allow overloaded pointer return; see linux/err.h */
	19	static inline void *ERR_PTR(long error)
	20	{
	21	return (void *) error;
	22	}
	23
	24	static inline long PTR_ERR(const void *ptr)
	25	{
	26	return (long) ptr;
	27	}
	28
	29	static inline long IS_ERR(const void *ptr)
	30	{
	31	return (unsigned long)ptr > (unsigned long)-1000L;
	32	}
121481ab	33
6b5ee137	34	static int add_file_to_cache(const char *path)
e83c5163	35	{
4c5abf42	36	int size, namelen, option, status;
e83c5163 LT	37	struct cache_entry *ce;
	38	struct stat st;
	39	int fd;
ffbe1add	40	char *target;
e83c5163	41
4c5abf42 JH	42	status = lstat(path, &st);
	43	if (status < 0 \|\| S_ISDIR(st.st_mode)) {
	44	/* When we used to have "path" and now we want to add
	45	* "path/file", we need a way to remove "path" before
	46	* being able to add "path/file". However,
215a7ad1	47	* "git-update-index --remove path" would not work.
4c5abf42 JH	48	* --force-remove can be used but this is more user
	49	* friendly, especially since we can do the opposite
	50	* case just fine without --force-remove.
	51	*/
	52	if (status == 0 \|\| (errno == ENOENT \|\| errno == ENOTDIR)) {
34143b26 PB	53	if (allow_remove) {
	54	if (remove_file_from_cache(path))
	55	return error("%s: cannot remove from the index",
	56	path);
	57	else
	58	return 0;
	59	} else if (status < 0) {
	60	return error("%s: does not exist and --remove not passed",
	61	path);
	62	}
121481ab	63	}
89bc8c78	64	if (0 == status)
34143b26 PB	65	return error("%s: is a directory - add files inside instead",
34143b26 PB	66	path);
89bc8c78 AW	67	else
	68	return error("lstat(\"%s\"): %s", path,
	69	strerror(errno));
e83c5163	70	}
e83c5163 LT	71	namelen = strlen(path);
e83c5163 LT	72	size = cache_entry_size(namelen);
812666c8	73	ce = xmalloc(size);
e83c5163 LT	74	memset(ce, 0, size);
e83c5163 LT	75	memcpy(ce->name, path, namelen);
711cf3a0	76	fill_stat_cache_info(ce, &st);
e4479470	77	ce->ce_mode = create_ce_mode(st.st_mode);
f5cabd13	78	ce->ce_flags = htons(namelen);
8ae0a8c5 KS	79	switch (st.st_mode & S_IFMT) {
	80	case S_IFREG:
	81	fd = open(path, O_RDONLY);
	82	if (fd < 0)
34143b26	83	return error("open(\"%s\"): %s", path, strerror(errno));
df6e1516	84	if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
34143b26	85	return error("%s: failed to insert into database", path);
8ae0a8c5 KS	86	break;
8ae0a8c5 KS	87	case S_IFLNK:
ffbe1add KS	88	target = xmalloc(st.st_size+1);
ffbe1add KS	89	if (readlink(path, target, st.st_size+1) != st.st_size) {
34143b26	90	char *errstr = strerror(errno);
ffbe1add	91	free(target);
34143b26 PB	92	return error("readlink(\"%s\"): %s", path,
34143b26 PB	93	errstr);
ffbe1add	94	}
df6e1516 BL	95	if (info_only) {
	96	unsigned char hdr[50];
	97	int hdrlen;
	98	write_sha1_file_prepare(target, st.st_size, "blob",
	99	ce->sha1, hdr, &hdrlen);
	100	} else if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
34143b26	101	return error("%s: failed to insert into database", path);
ffbe1add	102	free(target);
8ae0a8c5 KS	103	break;
8ae0a8c5 KS	104	default:
34143b26	105	return error("%s: unsupported file type", path);
8ae0a8c5	106	}
192268c1 JH	107	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
192268c1 JH	108	option \|= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
34143b26 PB	109	if (add_cache_entry(ce, option))
	110	return error("%s: cannot add to the index - missing --add option?",
	111	path);
	112	return 0;
121481ab LT	113	}
121481ab LT	114
711cf3a0 LT	115	/*
	116	* "refresh" does not calculate a new sha1 file or bring the
	117	* cache up-to-date for mode/content changes. But what it
	118	* _does_ do is to "re-match" the stat information of a file
	119	* with the cache, so that you can refresh the cache for a
	120	* file that hasn't been changed but where the stat entry is
	121	* out of date.
	122	*
667bb59b	123	* For example, you'd want to do this after doing a "git-read-tree",
711cf3a0 LT	124	* to link up the stat cache details with the proper files.
	125	*/
	126	static struct cache_entry refresh_entry(struct cache_entry ce)
	127	{
	128	struct stat st;
	129	struct cache_entry *updated;
	130	int changed, size;
	131
8ae0a8c5	132	if (lstat(ce->name, &st) < 0)
c6e007b0	133	return ERR_PTR(-errno);
711cf3a0	134
5d728c84	135	changed = ce_match_stat(ce, &st);
711cf3a0 LT	136	if (!changed)
	137	return ce;
	138
b0391890	139	if (ce_modified(ce, &st))
c6e007b0	140	return ERR_PTR(-EINVAL);
711cf3a0 LT	141
711cf3a0 LT	142	size = ce_size(ce);
812666c8	143	updated = xmalloc(size);
711cf3a0 LT	144	memcpy(updated, ce, size);
	145	fill_stat_cache_info(updated, &st);
	146	return updated;
121481ab LT	147	}
121481ab LT	148
90535218	149	static int refresh_cache(void)
121481ab LT	150	{
121481ab LT	151	int i;
90535218	152	int has_errors = 0;
121481ab	153
711cf3a0	154	for (i = 0; i < active_nr; i++) {
1bc992ac JH	155	struct cache_entry ce, new;
	156	ce = active_cache[i];
	157	if (ce_stage(ce)) {
	158	printf("%s: needs merge\n", ce->name);
90535218	159	has_errors = 1;
1bc992ac JH	160	while ((i < active_nr) &&
	161	! strcmp(active_cache[i]->name, ce->name))
	162	i++;
	163	i--;
	164	continue;
	165	}
711cf3a0	166
1bc992ac	167	new = refresh_entry(ce);
c6e007b0	168	if (IS_ERR(new)) {
0ed3715f LT	169	if (not_new && PTR_ERR(new) == -ENOENT)
	170	continue;
	171	if (quiet)
	172	continue;
	173	printf("%s: needs update\n", ce->name);
	174	has_errors = 1;
711cf3a0 LT	175	continue;
711cf3a0 LT	176	}
ee267527	177	active_cache_changed = 1;
62d046a0 PB	178	/* You can NOT just free active_cache[i] here, since it
	179	* might not be necessarily malloc()ed but can also come
	180	* from mmap(). */
711cf3a0 LT	181	active_cache[i] = new;
711cf3a0 LT	182	}
90535218	183	return has_errors;
e83c5163 LT	184	}
e83c5163 LT	185
e83c5163 LT	186	/*
e83c5163 LT	187	* We fundamentally don't like some paths: we don't want
320d3a1b LT	188	* dot or dot-dot anywhere, and for obvious reasons don't
320d3a1b LT	189	* want to recurse into ".git" either.
e83c5163 LT	190	*
e83c5163 LT	191	* Also, we don't want double slashes or slashes at the
aebb2679	192	* end that can make pathnames ambiguous.
e83c5163	193	*/
320d3a1b LT	194	static int verify_dotfile(const char *rest)
	195	{
	196	/*
	197	* The first character was '.', but that
	198	* has already been discarded, we now test
	199	* the rest.
	200	*/
	201	switch (*rest) {
	202	/* "." is not allowed */
	203	case '\0': case '/':
	204	return 0;
	205
	206	/*
	207	* ".git" followed by NUL or slash is bad. This
	208	* shares the path end test with the ".." case.
	209	*/
	210	case 'g':
	211	if (rest[1] != 'i')
	212	break;
	213	if (rest[2] != 't')
	214	break;
	215	rest += 2;
	216	/* fallthrough */
	217	case '.':
	218	if (rest[1] == '\0' \|\| rest[1] == '/')
	219	return 0;
	220	}
	221	return 1;
	222	}
	223
6b5ee137	224	static int verify_path(const char *path)
e83c5163 LT	225	{
	226	char c;
	227
	228	goto inside;
	229	for (;;) {
	230	if (!c)
	231	return 1;
	232	if (c == '/') {
	233	inside:
	234	c = *path++;
320d3a1b LT	235	switch (c) {
320d3a1b LT	236	default:
e83c5163	237	continue;
320d3a1b LT	238	case '/': case '\0':
	239	break;
	240	case '.':
	241	if (verify_dotfile(path))
	242	continue;
	243	}
e83c5163 LT	244	return 0;
	245	}
	246	c = *path++;
	247	}
	248	}
	249
6b5ee137	250	static int add_cacheinfo(const char arg1, const char arg2, const char *arg3)
9945d980	251	{
192268c1	252	int size, len, option;
9945d980 LT	253	unsigned int mode;
	254	unsigned char sha1[20];
	255	struct cache_entry *ce;
	256
	257	if (sscanf(arg1, "%o", &mode) != 1)
	258	return -1;
9945d980 LT	259	if (get_sha1_hex(arg2, sha1))
9945d980 LT	260	return -1;
9945d980 LT	261	if (!verify_path(arg3))
9945d980 LT	262	return -1;
9945d980 LT	263
	264	len = strlen(arg3);
	265	size = cache_entry_size(len);
812666c8	266	ce = xmalloc(size);
9945d980 LT	267	memset(ce, 0, size);
	268
	269	memcpy(ce->sha1, sha1, 20);
	270	memcpy(ce->name, arg3, len);
f5cabd13	271	ce->ce_flags = htons(len);
e4479470	272	ce->ce_mode = create_ce_mode(mode);
192268c1 JH	273	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
	274	option \|= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
	275	return add_cache_entry(ce, option);
9945d980 LT	276	}
9945d980 LT	277
e99d59ff	278	static struct cache_file cache_file;
f2a19340	279
6b5ee137	280	int main(int argc, const char **argv)
e83c5163	281	{
90535218	282	int i, newfd, entries, has_errors = 0;
121481ab	283	int allow_options = 1;
cfb0af1d	284	const char *prefix = setup_git_directory();
bb233d69	285
415e96c8	286	newfd = hold_index_file_for_update(&cache_file, get_index_file());
9614b8dc	287	if (newfd < 0)
2de381f9	288	die("unable to create new cachefile");
9614b8dc	289
e83c5163	290	entries = read_cache();
9614b8dc	291	if (entries < 0)
2de381f9	292	die("cache corrupted");
e83c5163	293
e83c5163	294	for (i = 1 ; i < argc; i++) {
6b5ee137	295	const char *path = argv[i];
121481ab LT	296
	297	if (allow_options && *path == '-') {
	298	if (!strcmp(path, "--")) {
	299	allow_options = 0;
	300	continue;
	301	}
0ed3715f LT	302	if (!strcmp(path, "-q")) {
	303	quiet = 1;
	304	continue;
	305	}
121481ab LT	306	if (!strcmp(path, "--add")) {
	307	allow_add = 1;
	308	continue;
	309	}
192268c1 JH	310	if (!strcmp(path, "--replace")) {
	311	allow_replace = 1;
	312	continue;
	313	}
121481ab LT	314	if (!strcmp(path, "--remove")) {
	315	allow_remove = 1;
	316	continue;
	317	}
	318	if (!strcmp(path, "--refresh")) {
90535218	319	has_errors \|= refresh_cache();
121481ab LT	320	continue;
121481ab LT	321	}
9945d980	322	if (!strcmp(path, "--cacheinfo")) {
b3f94c4b	323	if (i+3 >= argc)
215a7ad1	324	die("git-update-index: --cacheinfo <mode> <sha1> <path>");
b3f94c4b	325	if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
215a7ad1	326	die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
9945d980 LT	327	i += 3;
	328	continue;
	329	}
df6e1516 BL	330	if (!strcmp(path, "--info-only")) {
	331	info_only = 1;
	332	continue;
	333	}
0ff5bf7c	334	if (!strcmp(path, "--force-remove")) {
9b63f501	335	force_remove = 1;
0ff5bf7c JH	336	continue;
	337	}
	338
c6e007b0 JB	339	if (!strcmp(path, "--ignore-missing")) {
	340	not_new = 1;
	341	continue;
	342	}
2de381f9	343	die("unknown option %s", path);
121481ab	344	}
cfb0af1d	345	path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
e83c5163 LT	346	if (!verify_path(path)) {
	347	fprintf(stderr, "Ignoring path %s\n", argv[i]);
	348	continue;
	349	}
9b63f501 PB	350	if (force_remove) {
9b63f501 PB	351	if (remove_file_from_cache(path))
34143b26	352	die("git-update-index: unable to remove %s", path);
9b63f501 PB	353	continue;
9b63f501 PB	354	}
9614b8dc	355	if (add_file_to_cache(path))
34143b26	356	die("Unable to process file %s", path);
e83c5163	357	}
415e96c8 JH	358	if (write_cache(newfd, active_cache, active_nr) \|\|
415e96c8 JH	359	commit_index_file(&cache_file))
2de381f9	360	die("Unable to write new cachefile");
9614b8dc	361
c4b83e61	362	return has_errors ? 1 : 0;
e83c5163	363	}