[thirdparty/git.git] / upload-pack.c

#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
#include "tag.h"
#include "object.h"
#include "commit.h"

static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";

#define THEY_HAVE (1U << 0)
#define MAX_HAS 256
#define MAX_NEEDS 256
static int nr_has = 0, nr_needs = 0, multi_ack = 0;
static unsigned char has_sha1[MAX_HAS][20];
static unsigned char needs_sha1[MAX_NEEDS][20];
static unsigned int timeout = 0;

static void reset_timeout(void)
{
	alarm(timeout);
}

static int strip(char *line, int len)
{
	if (len && line[len-1] == '\n')
		line[--len] = 0;
	return len;
}

static void create_pack_file(void)
{
	int fd[2];
	pid_t pid;

	if (pipe(fd) < 0)
		die("git-upload-pack: unable to create pipe");
	pid = fork();
	if (pid < 0)
		die("git-upload-pack: unable to fork git-rev-list");

	if (!pid) {
		int i;
		int args;
		char **argv;
		char *buf;
		char **p;

		if (MAX_NEEDS <= nr_needs)
			args = nr_has + 10;
		else
			args = nr_has + nr_needs + 5;
		argv = xmalloc(args * sizeof(char *));
		buf = xmalloc(args * 45);
		p = argv;

		dup2(fd[1], 1);
		close(0);
		close(fd[0]);
		close(fd[1]);
		*p++ = "git-rev-list";
		*p++ = "--objects";
		if (MAX_NEEDS <= nr_needs)
			*p++ = "--all";
		else {
			for (i = 0; i < nr_needs; i++) {
				*p++ = buf;
				memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
				buf += 41;
			}
		}
		for (i = 0; i < nr_has; i++) {
			*p++ = buf;
			*buf++ = '^';
			memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
			buf += 41;
		}
		*p++ = NULL;
		execvp("git-rev-list", argv);
		die("git-upload-pack: unable to exec git-rev-list");
	}
	dup2(fd[0], 0);
	close(fd[0]);
	close(fd[1]);
	execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
	die("git-upload-pack: unable to exec git-pack-objects");
}

static int got_sha1(char *hex, unsigned char *sha1)
{
	if (get_sha1_hex(hex, sha1))
		die("git-upload-pack: expected SHA1 object, got '%s'", hex);
	if (!has_sha1_file(sha1))
		return 0;
	if (nr_has < MAX_HAS) {
		struct object *o = lookup_object(sha1);
		if (!o || (!o->parsed && !parse_object(sha1)))
			die("oops (%s)", sha1_to_hex(sha1));
		if (o->type == commit_type) {
			struct commit_list *parents;
			if (o->flags & THEY_HAVE)
				return 0;
			o->flags |= THEY_HAVE;
			for (parents = ((struct commit*)o)->parents;
			     parents;
			     parents = parents->next)
				parents->item->object.flags |= THEY_HAVE;
		}
		memcpy(has_sha1[nr_has++], sha1, 20);
	}
	return 1;
}

static int get_common_commits(void)
{
	static char line[1000];
	unsigned char sha1[20];
	int len;

	track_object_refs = 0;
	save_commit_buffer = 0;

	for(;;) {
		len = packet_read_line(0, line, sizeof(line));
		reset_timeout();

		if (!len) {
			if (multi_ack || nr_has == 0)
				packet_write(1, "NAK\n");
			continue;
		}
		len = strip(line, len);
		if (!strncmp(line, "have ", 5)) {
			if (got_sha1(line+5, sha1) &&
					(multi_ack || nr_has == 1))
				packet_write(1, "ACK %s%s\n",
					sha1_to_hex(sha1),
					multi_ack && nr_has < MAX_HAS ?
					" continue" : "");
			continue;
		}
		if (!strcmp(line, "done")) {
			if (nr_has > 0)
				return 0;
			packet_write(1, "NAK\n");
			return -1;
		}
		die("git-upload-pack: expected SHA1 list, got '%s'", line);
	}
}

static int receive_needs(void)
{
	static char line[1000];
	int len, needs;

	needs = 0;
	for (;;) {
		unsigned char dummy[20], *sha1_buf;
		len = packet_read_line(0, line, sizeof(line));
		reset_timeout();
		if (!len)
			return needs;

		sha1_buf = dummy;
		if (needs == MAX_NEEDS) {
			fprintf(stderr,
				"warning: supporting only a max of %d requests. "
				"sending everything instead.\n",
				MAX_NEEDS);
		}
		else if (needs < MAX_NEEDS)
			sha1_buf = needs_sha1[needs];

		if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
			die("git-upload-pack: protocol error, "
			    "expected to get sha, not '%s'", line);

		if (strstr(line+45, "multi_ack"))
			multi_ack = 1;

		needs++;
	}
}

static int send_ref(const char *refname, const unsigned char *sha1)
{
	struct object *o = parse_object(sha1);

	packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
	if (o->type == tag_type) {
		o = deref_tag(o);
		packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
	}
	return 0;
}

static int upload_pack(void)
{
	reset_timeout();
	head_ref(send_ref);
	for_each_ref(send_ref);
	packet_flush(1);
	nr_needs = receive_needs();
	if (!nr_needs)
		return 0;
	get_common_commits();
	create_pack_file();
	return 0;
}

int main(int argc, char **argv)
{
	const char *dir;
	int i;
	int strict = 0;

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

		if (arg[0] != '-')
			break;
		if (!strcmp(arg, "--strict")) {
			strict = 1;
			continue;
		}
		if (!strncmp(arg, "--timeout=", 10)) {
			timeout = atoi(arg+10);
			continue;
		}
		if (!strcmp(arg, "--")) {
			i++;
			break;
		}
	}
	
	if (i != argc-1)
		usage(upload_pack_usage);
	dir = argv[i];

	/* chdir to the directory. If that fails, try appending ".git" */
	if (chdir(dir) < 0) {
		if (strict || chdir(mkpath("%s.git", dir)) < 0)
			die("git-upload-pack unable to chdir to %s", dir);
	}
	if (!strict)
		chdir(".git");

	if (access("objects", X_OK) || access("refs", X_OK))
		die("git-upload-pack: %s doesn't seem to be a git archive", dir);

	putenv("GIT_DIR=.");
	upload_pack();
	return 0;
}
Commit	Line	Data
def88e9a LT	1	#include "cache.h"
	2	#include "refs.h"
	3	#include "pkt-line.h"
f6b42a81 JH	4	#include "tag.h"
f6b42a81 JH	5	#include "object.h"
794f9fe7	6	#include "commit.h"
def88e9a	7
960deccb	8	static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
def88e9a	9
794f9fe7	10	#define THEY_HAVE (1U << 0)
6b32884a JH	11	#define MAX_HAS 256
6b32884a JH	12	#define MAX_NEEDS 256
0f8fdc39	13	static int nr_has = 0, nr_needs = 0, multi_ack = 0;
fb9040cc LT	14	static unsigned char has_sha1[MAX_HAS][20];
fb9040cc LT	15	static unsigned char needs_sha1[MAX_NEEDS][20];
960deccb PA	16	static unsigned int timeout = 0;
	17
	18	static void reset_timeout(void)
	19	{
	20	alarm(timeout);
	21	}
fb9040cc	22
75bfc6c2 LT	23	static int strip(char *line, int len)
	24	{
	25	if (len && line[len-1] == '\n')
	26	line[--len] = 0;
	27	return len;
	28	}
	29
fb9040cc LT	30	static void create_pack_file(void)
fb9040cc LT	31	{
75bfc6c2 LT	32	int fd[2];
	33	pid_t pid;
	34
	35	if (pipe(fd) < 0)
	36	die("git-upload-pack: unable to create pipe");
	37	pid = fork();
	38	if (pid < 0)
	39	die("git-upload-pack: unable to fork git-rev-list");
	40
	41	if (!pid) {
	42	int i;
e091eb93 JH	43	int args;
	44	char **argv;
	45	char *buf;
	46	char **p;
	47
	48	if (MAX_NEEDS <= nr_needs)
	49	args = nr_has + 10;
	50	else
	51	args = nr_has + nr_needs + 5;
	52	argv = xmalloc(args * sizeof(char *));
	53	buf = xmalloc(args * 45);
	54	p = argv;
75bfc6c2 LT	55
	56	dup2(fd[1], 1);
	57	close(0);
	58	close(fd[0]);
	59	close(fd[1]);
	60	*p++ = "git-rev-list";
	61	*p++ = "--objects";
e091eb93 JH	62	if (MAX_NEEDS <= nr_needs)
	63	*p++ = "--all";
	64	else {
	65	for (i = 0; i < nr_needs; i++) {
	66	*p++ = buf;
	67	memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
	68	buf += 41;
	69	}
75bfc6c2 LT	70	}
	71	for (i = 0; i < nr_has; i++) {
	72	*p++ = buf;
	73	*buf++ = '^';
	74	memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
	75	buf += 41;
	76	}
	77	*p++ = NULL;
	78	execvp("git-rev-list", argv);
	79	die("git-upload-pack: unable to exec git-rev-list");
	80	}
	81	dup2(fd[0], 0);
	82	close(fd[0]);
	83	close(fd[1]);
	84	execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
	85	die("git-upload-pack: unable to exec git-pack-objects");
fb9040cc LT	86	}
fb9040cc LT	87
def88e9a LT	88	static int got_sha1(char hex, unsigned char sha1)
	89	{
	90	if (get_sha1_hex(hex, sha1))
	91	die("git-upload-pack: expected SHA1 object, got '%s'", hex);
fb9040cc LT	92	if (!has_sha1_file(sha1))
fb9040cc LT	93	return 0;
794f9fe7 JS	94	if (nr_has < MAX_HAS) {
	95	struct object *o = lookup_object(sha1);
	96	if (!o \|\| (!o->parsed && !parse_object(sha1)))
	97	die("oops (%s)", sha1_to_hex(sha1));
	98	if (o->type == commit_type) {
	99	struct commit_list *parents;
	100	if (o->flags & THEY_HAVE)
	101	return 0;
	102	o->flags \|= THEY_HAVE;
	103	for (parents = ((struct commit*)o)->parents;
	104	parents;
	105	parents = parents->next)
	106	parents->item->object.flags \|= THEY_HAVE;
	107	}
	108	memcpy(has_sha1[nr_has++], sha1, 20);
fb9040cc LT	109	}
fb9040cc LT	110	return 1;
def88e9a LT	111	}
	112
	113	static int get_common_commits(void)
	114	{
	115	static char line[1000];
	116	unsigned char sha1[20];
	117	int len;
	118
794f9fe7 JS	119	track_object_refs = 0;
	120	save_commit_buffer = 0;
	121
def88e9a LT	122	for(;;) {
def88e9a LT	123	len = packet_read_line(0, line, sizeof(line));
960deccb	124	reset_timeout();
def88e9a LT	125
def88e9a LT	126	if (!len) {
0f8fdc39 JS	127	if (multi_ack \|\| nr_has == 0)
0f8fdc39 JS	128	packet_write(1, "NAK\n");
def88e9a LT	129	continue;
def88e9a LT	130	}
75bfc6c2	131	len = strip(line, len);
def88e9a	132	if (!strncmp(line, "have ", 5)) {
0f8fdc39 JS	133	if (got_sha1(line+5, sha1) &&
	134	(multi_ack \|\| nr_has == 1))
	135	packet_write(1, "ACK %s%s\n",
	136	sha1_to_hex(sha1),
	137	multi_ack && nr_has < MAX_HAS ?
	138	" continue" : "");
def88e9a LT	139	continue;
	140	}
	141	if (!strcmp(line, "done")) {
0f8fdc39 JS	142	if (nr_has > 0)
0f8fdc39 JS	143	return 0;
def88e9a LT	144	packet_write(1, "NAK\n");
	145	return -1;
	146	}
	147	die("git-upload-pack: expected SHA1 list, got '%s'", line);
	148	}
def88e9a LT	149	}
def88e9a LT	150
fb9040cc LT	151	static int receive_needs(void)
	152	{
	153	static char line[1000];
	154	int len, needs;
	155
	156	needs = 0;
	157	for (;;) {
e091eb93	158	unsigned char dummy[20], *sha1_buf;
fb9040cc	159	len = packet_read_line(0, line, sizeof(line));
960deccb	160	reset_timeout();
fb9040cc LT	161	if (!len)
	162	return needs;
	163
e091eb93 JH	164	sha1_buf = dummy;
	165	if (needs == MAX_NEEDS) {
	166	fprintf(stderr,
	167	"warning: supporting only a max of %d requests. "
	168	"sending everything instead.\n",
	169	MAX_NEEDS);
	170	}
	171	else if (needs < MAX_NEEDS)
	172	sha1_buf = needs_sha1[needs];
	173
	174	if (strncmp("want ", line, 5) \|\| get_sha1_hex(line+5, sha1_buf))
	175	die("git-upload-pack: protocol error, "
	176	"expected to get sha, not '%s'", line);
0f8fdc39 JS	177
	178	if (strstr(line+45, "multi_ack"))
	179	multi_ack = 1;
	180
fb9040cc LT	181	needs++;
	182	}
	183	}
	184
def88e9a LT	185	static int send_ref(const char refname, const unsigned char sha1)
def88e9a LT	186	{
f6b42a81 JH	187	struct object *o = parse_object(sha1);
f6b42a81 JH	188
def88e9a	189	packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
f6b42a81 JH	190	if (o->type == tag_type) {
	191	o = deref_tag(o);
	192	packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
	193	}
def88e9a LT	194	return 0;
	195	}
	196
	197	static int upload_pack(void)
	198	{
960deccb	199	reset_timeout();
723c31fe	200	head_ref(send_ref);
def88e9a LT	201	for_each_ref(send_ref);
def88e9a LT	202	packet_flush(1);
fb9040cc LT	203	nr_needs = receive_needs();
	204	if (!nr_needs)
	205	return 0;
def88e9a	206	get_common_commits();
fb9040cc	207	create_pack_file();
def88e9a LT	208	return 0;
	209	}
	210
	211	int main(int argc, char **argv)
	212	{
	213	const char *dir;
960deccb PA	214	int i;
	215	int strict = 0;
	216
	217	for (i = 1; i < argc; i++) {
	218	char *arg = argv[i];
	219
	220	if (arg[0] != '-')
	221	break;
	222	if (!strcmp(arg, "--strict")) {
	223	strict = 1;
	224	continue;
	225	}
	226	if (!strncmp(arg, "--timeout=", 10)) {
	227	timeout = atoi(arg+10);
	228	continue;
	229	}
	230	if (!strcmp(arg, "--")) {
	231	i++;
	232	break;
	233	}
	234	}
	235
	236	if (i != argc-1)
def88e9a	237	usage(upload_pack_usage);
960deccb	238	dir = argv[i];
113b9475 LT	239
	240	/* chdir to the directory. If that fails, try appending ".git" */
	241	if (chdir(dir) < 0) {
960deccb	242	if (strict \|\| chdir(mkpath("%s.git", dir)) < 0)
113b9475 LT	243	die("git-upload-pack unable to chdir to %s", dir);
113b9475 LT	244	}
960deccb PA	245	if (!strict)
	246	chdir(".git");
	247
def88e9a LT	248	if (access("objects", X_OK) \|\| access("refs", X_OK))
def88e9a LT	249	die("git-upload-pack: %s doesn't seem to be a git archive", dir);
960deccb	250
e72a7d45	251	putenv("GIT_DIR=.");
def88e9a LT	252	upload_pack();
	253	return 0;
	254	}