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

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

static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
{
	z_stream stream;
	int max_out_bytes = namelen + st->st_size + 200;
	void *out = malloc(max_out_bytes);
	void *metadata = malloc(namelen + 200);
	void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	SHA_CTX c;

	close(fd);
	if (!out || (int)(long)in == -1)
		return -1;

	memset(&stream, 0, sizeof(stream));
	deflateInit(&stream, Z_BEST_COMPRESSION);

	/*
	 * ASCII size + nul byte
	 */	
	stream.next_in = metadata;
	stream.avail_in = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size);
	stream.next_out = out;
	stream.avail_out = max_out_bytes;
	while (deflate(&stream, 0) == Z_OK)
		/* nothing */;

	/*
	 * File content
	 */
	stream.next_in = in;
	stream.avail_in = st->st_size;
	while (deflate(&stream, Z_FINISH) == Z_OK)
		/*nothing */;

	deflateEnd(&stream);
	
	SHA1_Init(&c);
	SHA1_Update(&c, out, stream.total_out);
	SHA1_Final(ce->sha1, &c);

	return write_sha1_buffer(ce->sha1, out, stream.total_out);
}

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

	fd = open(path, O_RDONLY);
	if (fd < 0) {
		if (errno == ENOENT)
			return remove_file_from_cache(path);
		return -1;
	}
	if (fstat(fd, &st) < 0) {
		close(fd);
		return -1;
	}
	namelen = strlen(path);
	size = cache_entry_size(namelen);
	ce = malloc(size);
	memset(ce, 0, size);
	memcpy(ce->name, path, namelen);
	ce->ctime.sec = st.st_ctime;
	ce->ctime.nsec = st.st_ctim.tv_nsec;
	ce->mtime.sec = st.st_mtime;
	ce->mtime.nsec = st.st_mtim.tv_nsec;
	ce->st_dev = st.st_dev;
	ce->st_ino = st.st_ino;
	ce->st_mode = st.st_mode;
	ce->st_uid = st.st_uid;
	ce->st_gid = st.st_gid;
	ce->st_size = st.st_size;
	ce->namelen = namelen;

	if (index_fd(path, namelen, ce, fd, &st) < 0)
		return -1;

	return add_cache_entry(ce);
}

/*
 * We fundamentally don't like some paths: we don't want
 * dot or dot-dot anywhere, and in fact, we don't even want
 * any other dot-files (.dircache or anything else). They
 * are hidden, for chist sake.
 *
 * Also, we don't want double slashes or slashes at the
 * end that can make pathnames ambiguous. 
 */
static int verify_path(char *path)
{
	char c;

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

int main(int argc, char **argv)
{
	int i, newfd, entries;

	entries = read_cache();
	if (entries < 0) {
		perror("cache corrupted");
		return -1;
	}

	newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
	if (newfd < 0) {
		perror("unable to create new cachefile");
		return -1;
	}
	for (i = 1 ; i < argc; i++) {
		char *path = argv[i];
		if (!verify_path(path)) {
			fprintf(stderr, "Ignoring path %s\n", argv[i]);
			continue;
		}
		if (add_file_to_cache(path)) {
			fprintf(stderr, "Unable to add %s to database\n", path);
			goto out;
		}
	}
	if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
		return 0;
out:
	unlink(".dircache/index.lock");
	return 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
e83c5163 LT	8	static int index_fd(const char path, int namelen, struct cache_entry ce, int fd, struct stat *st)
	9	{
	10	z_stream stream;
	11	int max_out_bytes = namelen + st->st_size + 200;
	12	void *out = malloc(max_out_bytes);
	13	void *metadata = malloc(namelen + 200);
	14	void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	15	SHA_CTX c;
	16
	17	close(fd);
	18	if (!out \|\| (int)(long)in == -1)
	19	return -1;
	20
	21	memset(&stream, 0, sizeof(stream));
	22	deflateInit(&stream, Z_BEST_COMPRESSION);
	23
	24	/*
	25	* ASCII size + nul byte
	26	*/
	27	stream.next_in = metadata;
	28	stream.avail_in = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size);
	29	stream.next_out = out;
	30	stream.avail_out = max_out_bytes;
	31	while (deflate(&stream, 0) == Z_OK)
	32	/* nothing */;
	33
	34	/*
	35	* File content
	36	*/
	37	stream.next_in = in;
	38	stream.avail_in = st->st_size;
	39	while (deflate(&stream, Z_FINISH) == Z_OK)
	40	/nothing /;
	41
	42	deflateEnd(&stream);
	43
	44	SHA1_Init(&c);
	45	SHA1_Update(&c, out, stream.total_out);
	46	SHA1_Final(ce->sha1, &c);
	47
	48	return write_sha1_buffer(ce->sha1, out, stream.total_out);
	49	}
	50
	51	static int add_file_to_cache(char *path)
	52	{
	53	int size, namelen;
	54	struct cache_entry *ce;
	55	struct stat st;
	56	int fd;
	57
	58	fd = open(path, O_RDONLY);
	59	if (fd < 0) {
	60	if (errno == ENOENT)
	61	return remove_file_from_cache(path);
	62	return -1;
	63	}
	64	if (fstat(fd, &st) < 0) {
	65	close(fd);
	66	return -1;
	67	}
	68	namelen = strlen(path);
	69	size = cache_entry_size(namelen);
	70	ce = malloc(size);
	71	memset(ce, 0, size);
72	memcpy(ce->name, path, namelen);
73	ce->ctime.sec = st.st_ctime;
74	ce->ctime.nsec = st.st_ctim.tv_nsec;
75	ce->mtime.sec = st.st_mtime;
76	ce->mtime.nsec = st.st_mtim.tv_nsec;
77	ce->st_dev = st.st_dev;
78	ce->st_ino = st.st_ino;
79	ce->st_mode = st.st_mode;
80	ce->st_uid = st.st_uid;
81	ce->st_gid = st.st_gid;
82	ce->st_size = st.st_size;
83	ce->namelen = namelen;
84
85	if (index_fd(path, namelen, ce, fd, &st) < 0)
86	return -1;
87
88	return add_cache_entry(ce);
89	}
90
e83c5163 LT	91	/*
	92	* We fundamentally don't like some paths: we don't want
	93	* dot or dot-dot anywhere, and in fact, we don't even want
	94	* any other dot-files (.dircache or anything else). They
	95	* are hidden, for chist sake.
	96	*
	97	* Also, we don't want double slashes or slashes at the
	98	* end that can make pathnames ambiguous.
	99	*/
	100	static int verify_path(char *path)
	101	{
	102	char c;
	103
	104	goto inside;
	105	for (;;) {
	106	if (!c)
	107	return 1;
	108	if (c == '/') {
	109	inside:
	110	c = *path++;
	111	if (c != '/' && c != '.' && c != '\0')
	112	continue;
	113	return 0;
	114	}
	115	c = *path++;
	116	}
	117	}
	118
	119	int main(int argc, char **argv)
	120	{
	121	int i, newfd, entries;
	122
	123	entries = read_cache();
	124	if (entries < 0) {
	125	perror("cache corrupted");
	126	return -1;
	127	}
	128
	129	newfd = open(".dircache/index.lock", O_RDWR \| O_CREAT \| O_EXCL, 0600);
	130	if (newfd < 0) {
	131	perror("unable to create new cachefile");
	132	return -1;
	133	}
	134	for (i = 1 ; i < argc; i++) {
	135	char *path = argv[i];
	136	if (!verify_path(path)) {
	137	fprintf(stderr, "Ignoring path %s\n", argv[i]);
	138	continue;
	139	}
	140	if (add_file_to_cache(path)) {
	141	fprintf(stderr, "Unable to add %s to database\n", path);
	142	goto out;
	143	}
	144	}
	145	if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
	146	return 0;
	147	out:
	148	unlink(".dircache/index.lock");
19b2860c	149	return 0;
e83c5163	150	}