[thirdparty/git.git] / local-fetch.c

/*
 * Copyright (C) 2005 Junio C Hamano
 */
#include "cache.h"
#include "commit.h"
#include "fetch.h"

static int use_link;
static int use_symlink;
static int use_filecopy = 1;
static int commits_on_stdin;

static const char *path; /* "Remote" git repository */

void prefetch(unsigned char *sha1)
{
}

static struct packed_git *packs;

static void setup_index(unsigned char *sha1)
{
	struct packed_git *new_pack;
	char filename[PATH_MAX];
	strcpy(filename, path);
	strcat(filename, "/objects/pack/pack-");
	strcat(filename, sha1_to_hex(sha1));
	strcat(filename, ".idx");
	new_pack = parse_pack_index_file(sha1, filename);
	new_pack->next = packs;
	packs = new_pack;
}

static int setup_indices(void)
{
	DIR *dir;
	struct dirent *de;
	char filename[PATH_MAX];
	unsigned char sha1[20];
	sprintf(filename, "%s/objects/pack/", path);
	dir = opendir(filename);
	if (!dir)
		return -1;
	while ((de = readdir(dir)) != NULL) {
		int namelen = strlen(de->d_name);
		if (namelen != 50 ||
		    !has_extension(de->d_name, ".pack"))
			continue;
		get_sha1_hex(de->d_name + 5, sha1);
		setup_index(sha1);
	}
	closedir(dir);
	return 0;
}

static int copy_file(const char *source, char *dest, const char *hex,
		     int warn_if_not_exists)
{
	safe_create_leading_directories(dest);
	if (use_link) {
		if (!link(source, dest)) {
			pull_say("link %s\n", hex);
			return 0;
		}
		/* If we got ENOENT there is no point continuing. */
		if (errno == ENOENT) {
			if (warn_if_not_exists)
				fprintf(stderr, "does not exist %s\n", source);
			return -1;
		}
	}
	if (use_symlink) {
		struct stat st;
		if (stat(source, &st)) {
			if (!warn_if_not_exists && errno == ENOENT)
				return -1;
			fprintf(stderr, "cannot stat %s: %s\n", source,
				strerror(errno));
			return -1;
		}
		if (!symlink(source, dest)) {
			pull_say("symlink %s\n", hex);
			return 0;
		}
	}
	if (use_filecopy) {
		int ifd, ofd, status = 0;

		ifd = open(source, O_RDONLY);
		if (ifd < 0) {
			if (!warn_if_not_exists && errno == ENOENT)
				return -1;
			fprintf(stderr, "cannot open %s\n", source);
			return -1;
		}
		ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
		if (ofd < 0) {
			fprintf(stderr, "cannot open %s\n", dest);
			close(ifd);
			return -1;
		}
		status = copy_fd(ifd, ofd);
		close(ofd);
		if (status)
			fprintf(stderr, "cannot write %s\n", dest);
		else
			pull_say("copy %s\n", hex);
		return status;
	}
	fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
	return -1;
}

static int fetch_pack(const unsigned char *sha1)
{
	struct packed_git *target;
	char filename[PATH_MAX];
	if (setup_indices())
		return -1;
	target = find_sha1_pack(sha1, packs);
	if (!target)
		return error("Couldn't find %s: not separate or in any pack", 
			     sha1_to_hex(sha1));
	if (get_verbosely) {
		fprintf(stderr, "Getting pack %s\n",
			sha1_to_hex(target->sha1));
		fprintf(stderr, " which contains %s\n",
			sha1_to_hex(sha1));
	}
	sprintf(filename, "%s/objects/pack/pack-%s.pack", 
		path, sha1_to_hex(target->sha1));
	copy_file(filename, sha1_pack_name(target->sha1),
		  sha1_to_hex(target->sha1), 1);
	sprintf(filename, "%s/objects/pack/pack-%s.idx", 
		path, sha1_to_hex(target->sha1));
	copy_file(filename, sha1_pack_index_name(target->sha1),
		  sha1_to_hex(target->sha1), 1);
	install_packed_git(target);
	return 0;
}

static int fetch_file(const unsigned char *sha1)
{
	static int object_name_start = -1;
	static char filename[PATH_MAX];
	char *hex = sha1_to_hex(sha1);
	char *dest_filename = sha1_file_name(sha1);

 	if (object_name_start < 0) {
		strcpy(filename, path); /* e.g. git.git */
		strcat(filename, "/objects/");
		object_name_start = strlen(filename);
	}
	filename[object_name_start+0] = hex[0];
	filename[object_name_start+1] = hex[1];
	filename[object_name_start+2] = '/';
	strcpy(filename + object_name_start + 3, hex + 2);
	return copy_file(filename, dest_filename, hex, 0);
}

int fetch(unsigned char *sha1)
{
	if (has_sha1_file(sha1))
		return 0;
	else
		return fetch_file(sha1) && fetch_pack(sha1);
}

int fetch_ref(char *ref, unsigned char *sha1)
{
	static int ref_name_start = -1;
	static char filename[PATH_MAX];
	static char hex[41];
	int ifd;

	if (ref_name_start < 0) {
		sprintf(filename, "%s/refs/", path);
		ref_name_start = strlen(filename);
	}
	strcpy(filename + ref_name_start, ref);
	ifd = open(filename, O_RDONLY);
	if (ifd < 0) {
		close(ifd);
		fprintf(stderr, "cannot open %s\n", filename);
		return -1;
	}
	if (read_in_full(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
		close(ifd);
		fprintf(stderr, "cannot read from %s\n", filename);
		return -1;
	}
	close(ifd);
	pull_say("ref %s\n", sha1_to_hex(sha1));
	return 0;
}

static const char local_pull_usage[] =
"git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";

/*
 * By default we only use file copy.
 * If -l is specified, a hard link is attempted.
 * If -s is specified, then a symlink is attempted.
 * If -n is _not_ specified, then a regular file-to-file copy is done.
 */
int main(int argc, const char **argv)
{
	int commits;
	const char **write_ref = NULL;
	char **commit_id;
	int arg = 1;

	setup_git_directory();
	git_config(git_default_config);

	while (arg < argc && argv[arg][0] == '-') {
		if (argv[arg][1] == 't')
			get_tree = 1;
		else if (argv[arg][1] == 'c')
			get_history = 1;
		else if (argv[arg][1] == 'a') {
			get_all = 1;
			get_tree = 1;
			get_history = 1;
		}
		else if (argv[arg][1] == 'l')
			use_link = 1;
		else if (argv[arg][1] == 's')
			use_symlink = 1;
		else if (argv[arg][1] == 'n')
			use_filecopy = 0;
		else if (argv[arg][1] == 'v')
			get_verbosely = 1;
		else if (argv[arg][1] == 'w')
			write_ref = &argv[++arg];
		else if (!strcmp(argv[arg], "--recover"))
			get_recover = 1;
		else if (!strcmp(argv[arg], "--stdin"))
			commits_on_stdin = 1;
		else
			usage(local_pull_usage);
		arg++;
	}
	if (argc < arg + 2 - commits_on_stdin)
		usage(local_pull_usage);
	if (commits_on_stdin) {
		commits = pull_targets_stdin(&commit_id, &write_ref);
	} else {
		commit_id = (char **) &argv[arg++];
		commits = 1;
	}
	path = argv[arg];

	if (pull(commits, commit_id, write_ref, path))
		return 1;

	if (commits_on_stdin)
		pull_targets_free(commits, commit_id, write_ref);

	return 0;
}
Commit	Line	Data
b02a26cb JH	1	/*
	2	* Copyright (C) 2005 Junio C Hamano
	3	*/
dfcb4057 JH	4	#include "cache.h"
dfcb4057 JH	5	#include "commit.h"
215a7ad1	6	#include "fetch.h"
dfcb4057	7
96f1e58f DR	8	static int use_link;
96f1e58f DR	9	static int use_symlink;
b02a26cb	10	static int use_filecopy = 1;
96f1e58f	11	static int commits_on_stdin;
dfcb4057	12
8e87ca66	13	static const char path; / "Remote" git repository */
dfcb4057	14
1e8be59d DB	15	void prefetch(unsigned char *sha1)
	16	{
	17	}
	18
96f1e58f	19	static struct packed_git *packs;
08b11616	20
2ab141a2	21	static void setup_index(unsigned char *sha1)
dfcb4057	22	{
08b11616 DB	23	struct packed_git *new_pack;
	24	char filename[PATH_MAX];
	25	strcpy(filename, path);
	26	strcat(filename, "/objects/pack/pack-");
	27	strcat(filename, sha1_to_hex(sha1));
	28	strcat(filename, ".idx");
	29	new_pack = parse_pack_index_file(sha1, filename);
	30	new_pack->next = packs;
	31	packs = new_pack;
	32	}
dfcb4057	33
2ab141a2	34	static int setup_indices(void)
08b11616 DB	35	{
	36	DIR *dir;
	37	struct dirent *de;
	38	char filename[PATH_MAX];
	39	unsigned char sha1[20];
	40	sprintf(filename, "%s/objects/pack/", path);
	41	dir = opendir(filename);
8be707de SV	42	if (!dir)
8be707de SV	43	return -1;
08b11616 DB	44	while ((de = readdir(dir)) != NULL) {
08b11616 DB	45	int namelen = strlen(de->d_name);
83a2b841	46	if (namelen != 50 \|\|
5bb1cda5	47	!has_extension(de->d_name, ".pack"))
08b11616	48	continue;
d9200320	49	get_sha1_hex(de->d_name + 5, sha1);
08b11616	50	setup_index(sha1);
dfcb4057	51	}
8be707de	52	closedir(dir);
08b11616 DB	53	return 0;
	54	}
	55
0ffdbbfe	56	static int copy_file(const char source, char dest, const char *hex,
628cd543	57	int warn_if_not_exists)
08b11616	58	{
0ffdbbfe	59	safe_create_leading_directories(dest);
fd0ffd3a	60	if (use_link) {
08b11616	61	if (!link(source, dest)) {
e78d9772	62	pull_say("link %s\n", hex);
fd0ffd3a JH	63	return 0;
	64	}
	65	/* If we got ENOENT there is no point continuing. */
	66	if (errno == ENOENT) {
628cd543 SV	67	if (warn_if_not_exists)
628cd543 SV	68	fprintf(stderr, "does not exist %s\n", source);
fd0ffd3a JH	69	return -1;
fd0ffd3a JH	70	}
dfcb4057	71	}
e2b77f02 SV	72	if (use_symlink) {
	73	struct stat st;
	74	if (stat(source, &st)) {
628cd543 SV	75	if (!warn_if_not_exists && errno == ENOENT)
628cd543 SV	76	return -1;
e2b77f02 SV	77	fprintf(stderr, "cannot stat %s: %s\n", source,
	78	strerror(errno));
	79	return -1;
	80	}
	81	if (!symlink(source, dest)) {
	82	pull_say("symlink %s\n", hex);
	83	return 0;
	84	}
dfcb4057	85	}
b02a26cb	86	if (use_filecopy) {
52e4478d JH	87	int ifd, ofd, status = 0;
52e4478d JH	88
08b11616	89	ifd = open(source, O_RDONLY);
52e4478d JH	90	if (ifd < 0) {
52e4478d JH	91	if (!warn_if_not_exists && errno == ENOENT)
628cd543	92	return -1;
08b11616	93	fprintf(stderr, "cannot open %s\n", source);
b02a26cb JH	94	return -1;
b02a26cb JH	95	}
52e4478d JH	96	ofd = open(dest, O_WRONLY \| O_CREAT \| O_EXCL, 0666);
	97	if (ofd < 0) {
	98	fprintf(stderr, "cannot open %s\n", dest);
	99	close(ifd);
b02a26cb JH	100	return -1;
b02a26cb JH	101	}
52e4478d JH	102	status = copy_fd(ifd, ofd);
52e4478d JH	103	close(ofd);
b02a26cb	104	if (status)
08b11616	105	fprintf(stderr, "cannot write %s\n", dest);
b02a26cb	106	else
e78d9772	107	pull_say("copy %s\n", hex);
b02a26cb	108	return status;
dfcb4057	109	}
fd0ffd3a	110	fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
b02a26cb	111	return -1;
dfcb4057 JH	112	}
dfcb4057 JH	113
2ab141a2	114	static int fetch_pack(const unsigned char *sha1)
08b11616 DB	115	{
	116	struct packed_git *target;
	117	char filename[PATH_MAX];
	118	if (setup_indices())
	119	return -1;
	120	target = find_sha1_pack(sha1, packs);
	121	if (!target)
	122	return error("Couldn't find %s: not separate or in any pack",
	123	sha1_to_hex(sha1));
	124	if (get_verbosely) {
	125	fprintf(stderr, "Getting pack %s\n",
	126	sha1_to_hex(target->sha1));
	127	fprintf(stderr, " which contains %s\n",
	128	sha1_to_hex(sha1));
	129	}
	130	sprintf(filename, "%s/objects/pack/pack-%s.pack",
d9200320 JH	131	path, sha1_to_hex(target->sha1));
d9200320 JH	132	copy_file(filename, sha1_pack_name(target->sha1),
628cd543	133	sha1_to_hex(target->sha1), 1);
08b11616	134	sprintf(filename, "%s/objects/pack/pack-%s.idx",
d9200320 JH	135	path, sha1_to_hex(target->sha1));
d9200320 JH	136	copy_file(filename, sha1_pack_index_name(target->sha1),
628cd543	137	sha1_to_hex(target->sha1), 1);
08b11616 DB	138	install_packed_git(target);
	139	return 0;
	140	}
	141
2ab141a2	142	static int fetch_file(const unsigned char *sha1)
08b11616 DB	143	{
	144	static int object_name_start = -1;
	145	static char filename[PATH_MAX];
	146	char *hex = sha1_to_hex(sha1);
0ffdbbfe	147	char *dest_filename = sha1_file_name(sha1);
08b11616 DB	148
	149	if (object_name_start < 0) {
	150	strcpy(filename, path); /* e.g. git.git */
	151	strcat(filename, "/objects/");
	152	object_name_start = strlen(filename);
	153	}
	154	filename[object_name_start+0] = hex[0];
	155	filename[object_name_start+1] = hex[1];
	156	filename[object_name_start+2] = '/';
	157	strcpy(filename + object_name_start + 3, hex + 2);
628cd543	158	return copy_file(filename, dest_filename, hex, 0);
08b11616 DB	159	}
	160
	161	int fetch(unsigned char *sha1)
	162	{
11f0dafe NH	163	if (has_sha1_file(sha1))
	164	return 0;
	165	else
	166	return fetch_file(sha1) && fetch_pack(sha1);
08b11616 DB	167	}
08b11616 DB	168
cd541a68 DB	169	int fetch_ref(char ref, unsigned char sha1)
cd541a68 DB	170	{
f5ab6cca JH	171	static int ref_name_start = -1;
	172	static char filename[PATH_MAX];
	173	static char hex[41];
	174	int ifd;
	175
	176	if (ref_name_start < 0) {
	177	sprintf(filename, "%s/refs/", path);
	178	ref_name_start = strlen(filename);
	179	}
	180	strcpy(filename + ref_name_start, ref);
	181	ifd = open(filename, O_RDONLY);
	182	if (ifd < 0) {
	183	close(ifd);
	184	fprintf(stderr, "cannot open %s\n", filename);
	185	return -1;
	186	}
93d26e4c	187	if (read_in_full(ifd, hex, 40) != 40 \|\| get_sha1_hex(hex, sha1)) {
f5ab6cca JH	188	close(ifd);
	189	fprintf(stderr, "cannot read from %s\n", filename);
	190	return -1;
	191	}
	192	close(ifd);
	193	pull_say("ref %s\n", sha1_to_hex(sha1));
	194	return 0;
cd541a68 DB	195	}
cd541a68 DB	196
4d1f1190	197	static const char local_pull_usage[] =
8e87ca66	198	"git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";
dfcb4057	199
cc41cd2e	200	/*
b02a26cb JH	201	* By default we only use file copy.
	202	* If -l is specified, a hard link is attempted.
	203	* If -s is specified, then a symlink is attempted.
	204	* If -n is _not_ specified, then a regular file-to-file copy is done.
	205	*/
8e87ca66	206	int main(int argc, const char **argv)
dfcb4057	207	{
8e87ca66 PB	208	int commits;
	209	const char **write_ref = NULL;
	210	char **commit_id;
dfcb4057 JH	211	int arg = 1;
dfcb4057 JH	212
5a327713	213	setup_git_directory();
d0740d92	214	git_config(git_default_config);
5a327713	215
dfcb4057 JH	216	while (arg < argc && argv[arg][0] == '-') {
	217	if (argv[arg][1] == 't')
	218	get_tree = 1;
	219	else if (argv[arg][1] == 'c')
	220	get_history = 1;
	221	else if (argv[arg][1] == 'a') {
	222	get_all = 1;
	223	get_tree = 1;
	224	get_history = 1;
	225	}
	226	else if (argv[arg][1] == 'l')
	227	use_link = 1;
	228	else if (argv[arg][1] == 's')
	229	use_symlink = 1;
b02a26cb JH	230	else if (argv[arg][1] == 'n')
b02a26cb JH	231	use_filecopy = 0;
dfcb4057	232	else if (argv[arg][1] == 'v')
e78d9772	233	get_verbosely = 1;
f5ab6cca	234	else if (argv[arg][1] == 'w')
8e87ca66	235	write_ref = &argv[++arg];
820eca68 DB	236	else if (!strcmp(argv[arg], "--recover"))
820eca68 DB	237	get_recover = 1;
8e87ca66 PB	238	else if (!strcmp(argv[arg], "--stdin"))
8e87ca66 PB	239	commits_on_stdin = 1;
dfcb4057 JH	240	else
	241	usage(local_pull_usage);
	242	arg++;
	243	}
8e87ca66	244	if (argc < arg + 2 - commits_on_stdin)
dfcb4057	245	usage(local_pull_usage);
8e87ca66 PB	246	if (commits_on_stdin) {
	247	commits = pull_targets_stdin(&commit_id, &write_ref);
	248	} else {
	249	commit_id = (char **) &argv[arg++];
	250	commits = 1;
	251	}
	252	path = argv[arg];
dfcb4057	253
8e87ca66	254	if (pull(commits, commit_id, write_ref, path))
dfcb4057 JH	255	return 1;
dfcb4057 JH	256
8e87ca66 PB	257	if (commits_on_stdin)
	258	pull_targets_free(commits, commit_id, write_ref);
	259
dfcb4057 JH	260	return 0;
dfcb4057 JH	261	}