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

#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include <sys/wait.h>

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

static const char unpacker[] = "git-unpack-objects";

static int report_status = 0;

static char capabilities[] = "report-status";
static int capabilities_sent = 0;

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 = NULL;

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\n", 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\n", 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;
	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) {
		if (cmd_p->error_string)
			continue;
		argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1);
		strcpy(argv[argc], cmd_p->ref_name);
		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);
		memcpy(cmd->old_sha1, old_sha1, 20);
		memcpy(cmd->new_sha1, new_sha1, 20);
		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(unpacker, NULL);

	*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 LT	5	#include <sys/wait.h>
575f4974 LT	6
d0efc8a7	7	static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
575f4974	8
b1bf95bb	9	static const char unpacker[] = "git-unpack-objects";
575f4974	10
cfee10a7 JH	11	static int report_status = 0;
	12
	13	static char capabilities[] = "report-status";
	14	static int capabilities_sent = 0;
	15
944d8589	16	static int show_ref(const char path, const unsigned char sha1)
575f4974	17	{
cfee10a7 JH	18	if (capabilities_sent)
	19	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	20	else
	21	packet_write(1, "%s %s%c%s\n",
	22	sha1_to_hex(sha1), path, 0, capabilities);
	23	capabilities_sent = 1;
8a65ff76	24	return 0;
575f4974 LT	25	}
575f4974 LT	26
8a65ff76	27	static void write_head_info(void)
575f4974	28	{
8a65ff76	29	for_each_ref(show_ref);
cfee10a7 JH	30	if (!capabilities_sent)
	31	show_ref("capabilities^{}", null_sha1);
	32
575f4974 LT	33	}
575f4974 LT	34
eb1af2df LT	35	struct command {
eb1af2df LT	36	struct command *next;
cfee10a7	37	const char *error_string;
eb1af2df LT	38	unsigned char old_sha1[20];
eb1af2df LT	39	unsigned char new_sha1[20];
8f1d2e6f	40	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	41	};
575f4974 LT	42
6da4016a	43	static struct command *commands = NULL;
575f4974	44
f65fdf04 LT	45	static int is_all_zeroes(const char *hex)
	46	{
	47	int i;
	48	for (i = 0; i < 40; i++)
	49	if (*hex++ != '0')
	50	return 0;
	51	return 1;
	52	}
	53
2eca23da LT	54	static int verify_old_ref(const char name, char hex_contents)
	55	{
	56	int fd, ret;
	57	char buffer[60];
	58
f65fdf04 LT	59	if (is_all_zeroes(hex_contents))
f65fdf04 LT	60	return 0;
2eca23da LT	61	fd = open(name, O_RDONLY);
	62	if (fd < 0)
	63	return -1;
	64	ret = read(fd, buffer, 40);
	65	close(fd);
	66	if (ret != 40)
	67	return -1;
	68	if (memcmp(buffer, hex_contents, 40))
	69	return -1;
	70	return 0;
	71	}
	72
b1bf95bb JW	73	static char update_hook[] = "hooks/update";
	74
	75	static int run_update_hook(const char *refname,
	76	char old_hex, char new_hex)
	77	{
	78	int code;
	79
	80	if (access(update_hook, X_OK) < 0)
	81	return 0;
	82	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	83	switch (code) {
	84	case 0:
	85	return 0;
	86	case -ERR_RUN_COMMAND_FORK:
cfee10a7	87	return error("hook fork failed");
b1bf95bb	88	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	89	return error("hook execute failed");
b1bf95bb	90	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	91	return error("waitpid failed");
b1bf95bb	92	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	93	return error("waitpid is confused");
b1bf95bb	94	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
cfee10a7	95	return error("%s died of signal\n", update_hook);
b1bf95bb	96	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	97	return error("%s died strangely", update_hook);
b1bf95bb JW	98	default:
	99	error("%s exited with error code %d", update_hook, -code);
	100	return -code;
	101	}
	102	}
	103
cfee10a7	104	static int update(struct command *cmd)
2eca23da	105	{
cfee10a7 JH	106	const char *name = cmd->ref_name;
	107	unsigned char *old_sha1 = cmd->old_sha1;
	108	unsigned char *new_sha1 = cmd->new_sha1;
2eca23da LT	109	char new_hex[60], old_hex, lock_name;
	110	int newfd, namelen, written;
	111
cfee10a7 JH	112	cmd->error_string = NULL;
	113	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
	114	cmd->error_string = "funny refname";
d8a1deec JH	115	return error("refusing to create funny ref '%s' locally",
d8a1deec JH	116	name);
cfee10a7	117	}
d8a1deec	118
2eca23da LT	119	namelen = strlen(name);
	120	lock_name = xmalloc(namelen + 10);
	121	memcpy(lock_name, name, namelen);
	122	memcpy(lock_name + namelen, ".lock", 6);
	123
	124	strcpy(new_hex, sha1_to_hex(new_sha1));
2eca23da	125	old_hex = sha1_to_hex(old_sha1);
cfee10a7 JH	126	if (!has_sha1_file(new_sha1)) {
cfee10a7 JH	127	cmd->error_string = "bad pack";
19614330 JH	128	return error("unpack should have generated %s, "
19614330 JH	129	"but I can't find it!", new_hex);
cfee10a7	130	}
29f3b3de JH	131	safe_create_leading_directories(lock_name);
29f3b3de JH	132
f312de01	133	newfd = open(lock_name, O_CREAT \| O_EXCL \| O_WRONLY, 0666);
cfee10a7 JH	134	if (newfd < 0) {
cfee10a7 JH	135	cmd->error_string = "can't lock";
19614330 JH	136	return error("unable to create %s (%s)",
19614330 JH	137	lock_name, strerror(errno));
cfee10a7	138	}
f65fdf04 LT	139
	140	/* Write the ref with an ending '\n' */
	141	new_hex[40] = '\n';
	142	new_hex[41] = 0;
2eca23da	143	written = write(newfd, new_hex, 41);
f65fdf04 LT	144	/* Remove the '\n' again */
	145	new_hex[40] = 0;
	146
2eca23da LT	147	close(newfd);
	148	if (written != 41) {
	149	unlink(lock_name);
cfee10a7	150	cmd->error_string = "can't write";
19614330	151	return error("unable to write %s", lock_name);
2eca23da LT	152	}
	153	if (verify_old_ref(name, old_hex) < 0) {
	154	unlink(lock_name);
cfee10a7	155	cmd->error_string = "raced";
19614330	156	return error("%s changed during push", name);
2eca23da	157	}
b1bf95bb JW	158	if (run_update_hook(name, old_hex, new_hex)) {
b1bf95bb JW	159	unlink(lock_name);
cfee10a7	160	cmd->error_string = "hook declined";
19614330	161	return error("hook declined to update %s\n", name);
b1bf95bb JW	162	}
b1bf95bb JW	163	else if (rename(lock_name, name) < 0) {
2eca23da	164	unlink(lock_name);
cfee10a7	165	cmd->error_string = "can't rename";
19614330	166	return error("unable to replace %s", name);
2eca23da	167	}
19614330	168	else {
b1bf95bb	169	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330 JH	170	return 0;
19614330 JH	171	}
2eca23da LT	172	}
2eca23da LT	173
19614330 JH	174	static char update_post_hook[] = "hooks/post-update";
	175
	176	static void run_update_post_hook(struct command *cmd)
	177	{
	178	struct command *cmd_p;
	179	int argc;
	180	char **argv;
	181
	182	if (access(update_post_hook, X_OK) < 0)
	183	return;
	184	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	185	if (cmd_p->error_string)
19614330 JH	186	continue;
	187	argc++;
	188	}
	189	argv = xmalloc(sizeof(argv) (1 + argc));
	190	argv[0] = update_post_hook;
	191
	192	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	193	if (cmd_p->error_string)
19614330 JH	194	continue;
	195	argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1);
	196	strcpy(argv[argc], cmd_p->ref_name);
	197	argc++;
	198	}
	199	argv[argc] = NULL;
128aed68	200	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
19614330	201	}
2eca23da	202
575f4974 LT	203	/*
	204	* This gets called after(if) we've successfully
	205	* unpacked the data payload.
	206	*/
	207	static void execute_commands(void)
	208	{
eb1af2df LT	209	struct command *cmd = commands;
	210
	211	while (cmd) {
cfee10a7	212	update(cmd);
eb1af2df	213	cmd = cmd->next;
575f4974	214	}
19614330	215	run_update_post_hook(commands);
575f4974 LT	216	}
	217
	218	static void read_head_info(void)
	219	{
eb1af2df	220	struct command **p = &commands;
575f4974 LT	221	for (;;) {
575f4974 LT	222	static char line[1000];
eb1af2df LT	223	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	224	struct command *cmd;
cfee10a7 JH	225	char *refname;
cfee10a7 JH	226	int len, reflen;
eb1af2df LT	227
eb1af2df LT	228	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	229	if (!len)
575f4974 LT	230	break;
eb1af2df LT	231	if (line[len-1] == '\n')
	232	line[--len] = 0;
	233	if (len < 83 \|\|
	234	line[40] != ' ' \|\|
	235	line[81] != ' ' \|\|
	236	get_sha1_hex(line, old_sha1) \|\|
	237	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	238	die("protocol error: expected old/new/ref, got '%s'",
	239	line);
	240
	241	refname = line + 82;
	242	reflen = strlen(refname);
	243	if (reflen + 82 < len) {
	244	if (strstr(refname + reflen + 1, "report-status"))
	245	report_status = 1;
	246	}
eb1af2df LT	247	cmd = xmalloc(sizeof(struct command) + len - 80);
	248	memcpy(cmd->old_sha1, old_sha1, 20);
	249	memcpy(cmd->new_sha1, new_sha1, 20);
	250	memcpy(cmd->ref_name, line + 82, len - 81);
cfee10a7	251	cmd->error_string = "n/a (unpacker error)";
eb1af2df LT	252	cmd->next = NULL;
	253	*p = cmd;
	254	p = &cmd->next;
575f4974 LT	255	}
	256	}
	257
cfee10a7	258	static const char unpack(int error_code)
575f4974	259	{
b1bf95bb	260	int code = run_command(unpacker, NULL);
cfee10a7 JH	261
cfee10a7 JH	262	*error_code = 0;
b1bf95bb JW	263	switch (code) {
b1bf95bb JW	264	case 0:
cfee10a7	265	return NULL;
b1bf95bb	266	case -ERR_RUN_COMMAND_FORK:
cfee10a7	267	return "unpack fork failed";
b1bf95bb	268	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	269	return "unpack execute failed";
b1bf95bb	270	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	271	return "waitpid failed";
b1bf95bb	272	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	273	return "waitpid is confused";
b1bf95bb	274	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
cfee10a7	275	return "unpacker died of signal";
b1bf95bb	276	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	277	return "unpacker died strangely";
b1bf95bb	278	default:
cfee10a7 JH	279	*error_code = -code;
	280	return "unpacker exited with error code";
	281	}
	282	}
	283
	284	static void report(const char *unpack_status)
	285	{
	286	struct command *cmd;
	287	packet_write(1, "unpack %s\n",
	288	unpack_status ? unpack_status : "ok");
	289	for (cmd = commands; cmd; cmd = cmd->next) {
	290	if (!cmd->error_string)
	291	packet_write(1, "ok %s\n",
	292	cmd->ref_name);
	293	else
	294	packet_write(1, "ng %s %s\n",
	295	cmd->ref_name, cmd->error_string);
575f4974	296	}
cfee10a7	297	packet_flush(1);
575f4974 LT	298	}
	299
	300	int main(int argc, char **argv)
	301	{
d0efc8a7	302	int i;
8d630132	303	char *dir = NULL;
575f4974 LT	304
	305	argv++;
	306	for (i = 1; i < argc; i++) {
8d630132	307	char arg = argv++;
575f4974 LT	308
575f4974 LT	309	if (*arg == '-') {
575f4974 LT	310	/* Do flag handling here */
	311	usage(receive_pack_usage);
	312	}
d0efc8a7 LT	313	if (dir)
d0efc8a7 LT	314	usage(receive_pack_usage);
575f4974	315	dir = arg;
575f4974 LT	316	}
	317	if (!dir)
	318	usage(receive_pack_usage);
	319
8d630132 AE	320	if(!enter_repo(dir, 0))
8d630132 AE	321	die("'%s': unable to chdir or not a git archive", dir);
575f4974	322
8a65ff76	323	write_head_info();
575f4974 LT	324
575f4974 LT	325	/* EOF */
f3a3214e	326	packet_flush(1);
575f4974 LT	327
575f4974 LT	328	read_head_info();
7f8e9828	329	if (commands) {
cfee10a7 JH	330	int code;
	331	const char *unpack_status = unpack(&code);
	332	if (!unpack_status)
	333	execute_commands();
	334	if (report_status)
	335	report(unpack_status);
7f8e9828	336	}
575f4974 LT	337	return 0;
575f4974 LT	338	}