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

#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"

static const char receive_pack_usage[] = "git-receive-pack <git-dir>";

static const char *unpacker[] = { "unpack-objects", NULL };

static int report_status;

static char capabilities[] = "report-status";
static int capabilities_sent;

static int show_ref(const char *path, const unsigned char *sha1)
{
	if (capabilities_sent)
		packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	else
		packet_write(1, "%s %s%c%s\n",
			     sha1_to_hex(sha1), path, 0, capabilities);
	capabilities_sent = 1;
	return 0;
}

static void write_head_info(void)
{
	for_each_ref(show_ref);
	if (!capabilities_sent)
		show_ref("capabilities^{}", null_sha1);

}

struct command {
	struct command *next;
	const char *error_string;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	char ref_name[FLEX_ARRAY]; /* more */
};

static struct command *commands;

static int is_all_zeroes(const char *hex)
{
	int i;
	for (i = 0; i < 40; i++)
		if (*hex++ != '0')
			return 0;
	return 1;
}

static int verify_old_ref(const char *name, char *hex_contents)
{
	int fd, ret;
	char buffer[60];

	if (is_all_zeroes(hex_contents))
		return 0;
	fd = open(name, O_RDONLY);
	if (fd < 0)
		return -1;
	ret = read(fd, buffer, 40);
	close(fd);
	if (ret != 40)
		return -1;
	if (memcmp(buffer, hex_contents, 40))
		return -1;
	return 0;
}

static char update_hook[] = "hooks/update";

static int run_update_hook(const char *refname,
			   char *old_hex, char *new_hex)
{
	int code;

	if (access(update_hook, X_OK) < 0)
		return 0;
	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	switch (code) {
	case 0:
		return 0;
	case -ERR_RUN_COMMAND_FORK:
		return error("hook fork failed");
	case -ERR_RUN_COMMAND_EXEC:
		return error("hook execute failed");
	case -ERR_RUN_COMMAND_WAITPID:
		return error("waitpid failed");
	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
		return error("waitpid is confused");
	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
		return error("%s died of signal", update_hook);
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		return error("%s died strangely", update_hook);
	default:
		error("%s exited with error code %d", update_hook, -code);
		return -code;
	}
}

static int update(struct command *cmd)
{
	const char *name = cmd->ref_name;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;
	char new_hex[60], *old_hex, *lock_name;
	int newfd, namelen, written;

	cmd->error_string = NULL;
	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
		cmd->error_string = "funny refname";
		return error("refusing to create funny ref '%s' locally",
			     name);
	}

	namelen = strlen(name);
	lock_name = xmalloc(namelen + 10);
	memcpy(lock_name, name, namelen);
	memcpy(lock_name + namelen, ".lock", 6);

	strcpy(new_hex, sha1_to_hex(new_sha1));
	old_hex = sha1_to_hex(old_sha1);
	if (!has_sha1_file(new_sha1)) {
		cmd->error_string = "bad pack";
		return error("unpack should have generated %s, "
			     "but I can't find it!", new_hex);
	}
	safe_create_leading_directories(lock_name);

	newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
	if (newfd < 0) {
		cmd->error_string = "can't lock";
		return error("unable to create %s (%s)",
			     lock_name, strerror(errno));
	}

	/* Write the ref with an ending '\n' */
	new_hex[40] = '\n';
	new_hex[41] = 0;
	written = write(newfd, new_hex, 41);
	/* Remove the '\n' again */
	new_hex[40] = 0;

	close(newfd);
	if (written != 41) {
		unlink(lock_name);
		cmd->error_string = "can't write";
		return error("unable to write %s", lock_name);
	}
	if (verify_old_ref(name, old_hex) < 0) {
		unlink(lock_name);
		cmd->error_string = "raced";
		return error("%s changed during push", name);
	}
	if (run_update_hook(name, old_hex, new_hex)) {
		unlink(lock_name);
		cmd->error_string = "hook declined";
		return error("hook declined to update %s", name);
	}
	else if (rename(lock_name, name) < 0) {
		unlink(lock_name);
		cmd->error_string = "can't rename";
		return error("unable to replace %s", name);
	}
	else {
		fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
		return 0;
	}
}

static char update_post_hook[] = "hooks/post-update";

static void run_update_post_hook(struct command *cmd)
{
	struct command *cmd_p;
	int argc;
	const char **argv;

	if (access(update_post_hook, X_OK) < 0)
		return;
	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
		if (cmd_p->error_string)
			continue;
		argc++;
	}
	argv = xmalloc(sizeof(*argv) * (1 + argc));
	argv[0] = update_post_hook;

	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
		char *p;
		if (cmd_p->error_string)
			continue;
		p = xmalloc(strlen(cmd_p->ref_name) + 1);
		strcpy(p, cmd_p->ref_name);
		argv[argc] = p;
		argc++;
	}
	argv[argc] = NULL;
	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
}

/*
 * This gets called after(if) we've successfully
 * unpacked the data payload.
 */
static void execute_commands(void)
{
	struct command *cmd = commands;

	while (cmd) {
		update(cmd);
		cmd = cmd->next;
	}
	run_update_post_hook(commands);
}

static void read_head_info(void)
{
	struct command **p = &commands;
	for (;;) {
		static char line[1000];
		unsigned char old_sha1[20], new_sha1[20];
		struct command *cmd;
		char *refname;
		int len, reflen;

		len = packet_read_line(0, line, sizeof(line));
		if (!len)
			break;
		if (line[len-1] == '\n')
			line[--len] = 0;
		if (len < 83 ||
		    line[40] != ' ' ||
		    line[81] != ' ' ||
		    get_sha1_hex(line, old_sha1) ||
		    get_sha1_hex(line + 41, new_sha1))
			die("protocol error: expected old/new/ref, got '%s'",
			    line);

		refname = line + 82;
		reflen = strlen(refname);
		if (reflen + 82 < len) {
			if (strstr(refname + reflen + 1, "report-status"))
				report_status = 1;
		}
		cmd = xmalloc(sizeof(struct command) + len - 80);
		hashcpy(cmd->old_sha1, old_sha1);
		hashcpy(cmd->new_sha1, new_sha1);
		memcpy(cmd->ref_name, line + 82, len - 81);
		cmd->error_string = "n/a (unpacker error)";
		cmd->next = NULL;
		*p = cmd;
		p = &cmd->next;
	}
}

static const char *unpack(int *error_code)
{
	int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);

	*error_code = 0;
	switch (code) {
	case 0:
		return NULL;
	case -ERR_RUN_COMMAND_FORK:
		return "unpack fork failed";
	case -ERR_RUN_COMMAND_EXEC:
		return "unpack execute failed";
	case -ERR_RUN_COMMAND_WAITPID:
		return "waitpid failed";
	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
		return "waitpid is confused";
	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
		return "unpacker died of signal";
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		return "unpacker died strangely";
	default:
		*error_code = -code;
		return "unpacker exited with error code";
	}
}

static void report(const char *unpack_status)
{
	struct command *cmd;
	packet_write(1, "unpack %s\n",
		     unpack_status ? unpack_status : "ok");
	for (cmd = commands; cmd; cmd = cmd->next) {
		if (!cmd->error_string)
			packet_write(1, "ok %s\n",
				     cmd->ref_name);
		else
			packet_write(1, "ng %s %s\n",
				     cmd->ref_name, cmd->error_string);
	}
	packet_flush(1);
}

int main(int argc, char **argv)
{
	int i;
	char *dir = NULL;

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

		if (*arg == '-') {
			/* Do flag handling here */
			usage(receive_pack_usage);
		}
		if (dir)
			usage(receive_pack_usage);
		dir = arg;
	}
	if (!dir)
		usage(receive_pack_usage);

	if(!enter_repo(dir, 0))
		die("'%s': unable to chdir or not a git archive", dir);

	write_head_info();

	/* EOF */
	packet_flush(1);

	read_head_info();
	if (commands) {
		int code;
		const char *unpack_status = unpack(&code);
		if (!unpack_status)
			execute_commands();
		if (report_status)
			report(unpack_status);
	}
	return 0;
}
Commit	Line	Data
575f4974	1	#include "cache.h"
8a65ff76	2	#include "refs.h"
f3a3214e	3	#include "pkt-line.h"
b1bf95bb	4	#include "run-command.h"
575f4974	5
d0efc8a7	6	static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
575f4974	7
9201c707	8	static const char *unpacker[] = { "unpack-objects", NULL };
575f4974	9
96f1e58f	10	static int report_status;
cfee10a7 JH	11
cfee10a7 JH	12	static char capabilities[] = "report-status";
96f1e58f	13	static int capabilities_sent;
cfee10a7	14
944d8589	15	static int show_ref(const char path, const unsigned char sha1)
575f4974	16	{
cfee10a7 JH	17	if (capabilities_sent)
	18	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	19	else
	20	packet_write(1, "%s %s%c%s\n",
	21	sha1_to_hex(sha1), path, 0, capabilities);
	22	capabilities_sent = 1;
8a65ff76	23	return 0;
575f4974 LT	24	}
575f4974 LT	25
8a65ff76	26	static void write_head_info(void)
575f4974	27	{
8a65ff76	28	for_each_ref(show_ref);
cfee10a7 JH	29	if (!capabilities_sent)
	30	show_ref("capabilities^{}", null_sha1);
	31
575f4974 LT	32	}
575f4974 LT	33
eb1af2df LT	34	struct command {
eb1af2df LT	35	struct command *next;
cfee10a7	36	const char *error_string;
eb1af2df LT	37	unsigned char old_sha1[20];
eb1af2df LT	38	unsigned char new_sha1[20];
8f1d2e6f	39	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	40	};
575f4974 LT	41
96f1e58f	42	static struct command *commands;
575f4974	43
f65fdf04 LT	44	static int is_all_zeroes(const char *hex)
	45	{
	46	int i;
	47	for (i = 0; i < 40; i++)
	48	if (*hex++ != '0')
	49	return 0;
	50	return 1;
	51	}
	52
2eca23da LT	53	static int verify_old_ref(const char name, char hex_contents)
	54	{
	55	int fd, ret;
	56	char buffer[60];
	57
f65fdf04 LT	58	if (is_all_zeroes(hex_contents))
f65fdf04 LT	59	return 0;
2eca23da LT	60	fd = open(name, O_RDONLY);
	61	if (fd < 0)
	62	return -1;
	63	ret = read(fd, buffer, 40);
	64	close(fd);
	65	if (ret != 40)
	66	return -1;
	67	if (memcmp(buffer, hex_contents, 40))
	68	return -1;
	69	return 0;
	70	}
	71
b1bf95bb JW	72	static char update_hook[] = "hooks/update";
	73
	74	static int run_update_hook(const char *refname,
	75	char old_hex, char new_hex)
	76	{
	77	int code;
	78
	79	if (access(update_hook, X_OK) < 0)
	80	return 0;
	81	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	82	switch (code) {
	83	case 0:
	84	return 0;
	85	case -ERR_RUN_COMMAND_FORK:
cfee10a7	86	return error("hook fork failed");
b1bf95bb	87	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	88	return error("hook execute failed");
b1bf95bb	89	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	90	return error("waitpid failed");
b1bf95bb	91	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	92	return error("waitpid is confused");
b1bf95bb	93	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
bd2afde8	94	return error("%s died of signal", update_hook);
b1bf95bb	95	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	96	return error("%s died strangely", update_hook);
b1bf95bb JW	97	default:
	98	error("%s exited with error code %d", update_hook, -code);
	99	return -code;
	100	}
	101	}
	102
cfee10a7	103	static int update(struct command *cmd)
2eca23da	104	{
cfee10a7 JH	105	const char *name = cmd->ref_name;
	106	unsigned char *old_sha1 = cmd->old_sha1;
	107	unsigned char *new_sha1 = cmd->new_sha1;
2eca23da LT	108	char new_hex[60], old_hex, lock_name;
	109	int newfd, namelen, written;
	110
cfee10a7 JH	111	cmd->error_string = NULL;
	112	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
	113	cmd->error_string = "funny refname";
d8a1deec JH	114	return error("refusing to create funny ref '%s' locally",
d8a1deec JH	115	name);
cfee10a7	116	}
d8a1deec	117
2eca23da LT	118	namelen = strlen(name);
	119	lock_name = xmalloc(namelen + 10);
	120	memcpy(lock_name, name, namelen);
	121	memcpy(lock_name + namelen, ".lock", 6);
	122
	123	strcpy(new_hex, sha1_to_hex(new_sha1));
2eca23da	124	old_hex = sha1_to_hex(old_sha1);
cfee10a7 JH	125	if (!has_sha1_file(new_sha1)) {
cfee10a7 JH	126	cmd->error_string = "bad pack";
19614330 JH	127	return error("unpack should have generated %s, "
19614330 JH	128	"but I can't find it!", new_hex);
cfee10a7	129	}
29f3b3de JH	130	safe_create_leading_directories(lock_name);
29f3b3de JH	131
f312de01	132	newfd = open(lock_name, O_CREAT \| O_EXCL \| O_WRONLY, 0666);
cfee10a7 JH	133	if (newfd < 0) {
cfee10a7 JH	134	cmd->error_string = "can't lock";
19614330 JH	135	return error("unable to create %s (%s)",
19614330 JH	136	lock_name, strerror(errno));
cfee10a7	137	}
f65fdf04 LT	138
	139	/* Write the ref with an ending '\n' */
	140	new_hex[40] = '\n';
	141	new_hex[41] = 0;
2eca23da	142	written = write(newfd, new_hex, 41);
f65fdf04 LT	143	/* Remove the '\n' again */
	144	new_hex[40] = 0;
	145
2eca23da LT	146	close(newfd);
	147	if (written != 41) {
	148	unlink(lock_name);
cfee10a7	149	cmd->error_string = "can't write";
19614330	150	return error("unable to write %s", lock_name);
2eca23da LT	151	}
	152	if (verify_old_ref(name, old_hex) < 0) {
	153	unlink(lock_name);
cfee10a7	154	cmd->error_string = "raced";
19614330	155	return error("%s changed during push", name);
2eca23da	156	}
b1bf95bb JW	157	if (run_update_hook(name, old_hex, new_hex)) {
b1bf95bb JW	158	unlink(lock_name);
cfee10a7	159	cmd->error_string = "hook declined";
bd2afde8	160	return error("hook declined to update %s", name);
b1bf95bb JW	161	}
b1bf95bb JW	162	else if (rename(lock_name, name) < 0) {
2eca23da	163	unlink(lock_name);
cfee10a7	164	cmd->error_string = "can't rename";
19614330	165	return error("unable to replace %s", name);
2eca23da	166	}
19614330	167	else {
b1bf95bb	168	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330 JH	169	return 0;
19614330 JH	170	}
2eca23da LT	171	}
2eca23da LT	172
19614330 JH	173	static char update_post_hook[] = "hooks/post-update";
	174
	175	static void run_update_post_hook(struct command *cmd)
	176	{
	177	struct command *cmd_p;
	178	int argc;
9201c707	179	const char **argv;
19614330 JH	180
	181	if (access(update_post_hook, X_OK) < 0)
	182	return;
	183	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	184	if (cmd_p->error_string)
19614330 JH	185	continue;
	186	argc++;
	187	}
	188	argv = xmalloc(sizeof(argv) (1 + argc));
	189	argv[0] = update_post_hook;
	190
	191	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	192	char *p;
cfee10a7	193	if (cmd_p->error_string)
19614330	194	continue;
9201c707 JH	195	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	196	strcpy(p, cmd_p->ref_name);
	197	argv[argc] = p;
19614330 JH	198	argc++;
	199	}
	200	argv[argc] = NULL;
128aed68	201	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
19614330	202	}
2eca23da	203
575f4974 LT	204	/*
	205	* This gets called after(if) we've successfully
	206	* unpacked the data payload.
	207	*/
	208	static void execute_commands(void)
	209	{
eb1af2df LT	210	struct command *cmd = commands;
	211
	212	while (cmd) {
cfee10a7	213	update(cmd);
eb1af2df	214	cmd = cmd->next;
575f4974	215	}
19614330	216	run_update_post_hook(commands);
575f4974 LT	217	}
	218
	219	static void read_head_info(void)
	220	{
eb1af2df	221	struct command **p = &commands;
575f4974 LT	222	for (;;) {
575f4974 LT	223	static char line[1000];
eb1af2df LT	224	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	225	struct command *cmd;
cfee10a7 JH	226	char *refname;
cfee10a7 JH	227	int len, reflen;
eb1af2df LT	228
eb1af2df LT	229	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	230	if (!len)
575f4974 LT	231	break;
eb1af2df LT	232	if (line[len-1] == '\n')
	233	line[--len] = 0;
	234	if (len < 83 \|\|
	235	line[40] != ' ' \|\|
	236	line[81] != ' ' \|\|
	237	get_sha1_hex(line, old_sha1) \|\|
	238	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	239	die("protocol error: expected old/new/ref, got '%s'",
	240	line);
	241
	242	refname = line + 82;
	243	reflen = strlen(refname);
	244	if (reflen + 82 < len) {
	245	if (strstr(refname + reflen + 1, "report-status"))
	246	report_status = 1;
	247	}
eb1af2df	248	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	249	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	250	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	251	memcpy(cmd->ref_name, line + 82, len - 81);
cfee10a7	252	cmd->error_string = "n/a (unpacker error)";
eb1af2df LT	253	cmd->next = NULL;
	254	*p = cmd;
	255	p = &cmd->next;
575f4974 LT	256	}
	257	}
	258
cfee10a7	259	static const char unpack(int error_code)
575f4974	260	{
77cb17e9	261	int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
cfee10a7 JH	262
cfee10a7 JH	263	*error_code = 0;
b1bf95bb JW	264	switch (code) {
b1bf95bb JW	265	case 0:
cfee10a7	266	return NULL;
b1bf95bb	267	case -ERR_RUN_COMMAND_FORK:
cfee10a7	268	return "unpack fork failed";
b1bf95bb	269	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	270	return "unpack execute failed";
b1bf95bb	271	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	272	return "waitpid failed";
b1bf95bb	273	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	274	return "waitpid is confused";
b1bf95bb	275	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
cfee10a7	276	return "unpacker died of signal";
b1bf95bb	277	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	278	return "unpacker died strangely";
b1bf95bb	279	default:
cfee10a7 JH	280	*error_code = -code;
	281	return "unpacker exited with error code";
	282	}
	283	}
	284
	285	static void report(const char *unpack_status)
	286	{
	287	struct command *cmd;
	288	packet_write(1, "unpack %s\n",
	289	unpack_status ? unpack_status : "ok");
	290	for (cmd = commands; cmd; cmd = cmd->next) {
	291	if (!cmd->error_string)
	292	packet_write(1, "ok %s\n",
	293	cmd->ref_name);
	294	else
	295	packet_write(1, "ng %s %s\n",
	296	cmd->ref_name, cmd->error_string);
575f4974	297	}
cfee10a7	298	packet_flush(1);
575f4974 LT	299	}
	300
	301	int main(int argc, char **argv)
	302	{
d0efc8a7	303	int i;
8d630132	304	char *dir = NULL;
575f4974 LT	305
	306	argv++;
	307	for (i = 1; i < argc; i++) {
8d630132	308	char arg = argv++;
575f4974 LT	309
575f4974 LT	310	if (*arg == '-') {
575f4974 LT	311	/* Do flag handling here */
	312	usage(receive_pack_usage);
	313	}
d0efc8a7 LT	314	if (dir)
d0efc8a7 LT	315	usage(receive_pack_usage);
575f4974	316	dir = arg;
575f4974 LT	317	}
	318	if (!dir)
	319	usage(receive_pack_usage);
	320
8d630132 AE	321	if(!enter_repo(dir, 0))
8d630132 AE	322	die("'%s': unable to chdir or not a git archive", dir);
575f4974	323
8a65ff76	324	write_head_info();
575f4974 LT	325
575f4974 LT	326	/* EOF */
f3a3214e	327	packet_flush(1);
575f4974 LT	328
575f4974 LT	329	read_head_info();
7f8e9828	330	if (commands) {
cfee10a7 JH	331	int code;
	332	const char *unpack_status = unpack(&code);
	333	if (!unpack_status)
	334	execute_commands();
	335	if (report_status)
	336	report(unpack_status);
7f8e9828	337	}
575f4974 LT	338	return 0;
575f4974 LT	339	}