[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 show_ref(const char *path, const unsigned char *sha1)
{
	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	return 0;
}

static void write_head_info(void)
{
	for_each_ref(show_ref);
}

struct command {
	struct command *next;
	unsigned char updated;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	char ref_name[0];
};

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:
		die("hook fork failed");
	case -ERR_RUN_COMMAND_EXEC:
		die("hook execute failed");
	case -ERR_RUN_COMMAND_WAITPID:
		die("waitpid failed");
	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
		die("waitpid is confused");
	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
		fprintf(stderr, "%s died of signal\n", update_hook);
		return -1;
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		die("%s died strangely", update_hook);
	default:
		error("%s exited with error code %d", update_hook, -code);
		return -code;
	}
}

static int update(const char *name,
		  unsigned char *old_sha1, unsigned char *new_sha1)
{
	char new_hex[60], *old_hex, *lock_name;
	int newfd, namelen, written;

	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5))
		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))
		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)
		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);
		return error("unable to write %s", lock_name);
	}
	if (verify_old_ref(name, old_hex) < 0) {
		unlink(lock_name);
		return error("%s changed during push", name);
	}
	if (run_update_hook(name, old_hex, new_hex)) {
		unlink(lock_name);
		return error("hook declined to update %s\n", name);
	}
	else if (rename(lock_name, name) < 0) {
		unlink(lock_name);
		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->updated)
			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->updated)
			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) {
		cmd->updated = !update(cmd->ref_name,
				       cmd->old_sha1, cmd->new_sha1);
		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;
		int len;

		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);
		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->next = NULL;
		*p = cmd;
		p = &cmd->next;
	}
}

static void unpack(void)
{
	int code = run_command(unpacker, NULL);
	switch (code) {
	case 0:
		return;
	case -ERR_RUN_COMMAND_FORK:
		die("unpack fork failed");
	case -ERR_RUN_COMMAND_EXEC:
		die("unpack execute failed");
	case -ERR_RUN_COMMAND_WAITPID:
		die("waitpid failed");
	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
		die("waitpid is confused");
	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
		die("%s died of signal", unpacker);
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		die("%s died strangely", unpacker);
	default:
		die("%s exited with error code %d", unpacker, -code);
	}
}

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) {
		unpack();
		execute_commands();
	}
	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
944d8589	11	static int show_ref(const char path, const unsigned char sha1)
575f4974	12	{
f3a3214e	13	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
8a65ff76	14	return 0;
575f4974 LT	15	}
575f4974 LT	16
8a65ff76	17	static void write_head_info(void)
575f4974	18	{
8a65ff76	19	for_each_ref(show_ref);
575f4974 LT	20	}
575f4974 LT	21
eb1af2df LT	22	struct command {
eb1af2df LT	23	struct command *next;
19614330	24	unsigned char updated;
eb1af2df LT	25	unsigned char old_sha1[20];
eb1af2df LT	26	unsigned char new_sha1[20];
2c04662d	27	char ref_name[0];
575f4974 LT	28	};
575f4974 LT	29
6da4016a	30	static struct command *commands = NULL;
575f4974	31
f65fdf04 LT	32	static int is_all_zeroes(const char *hex)
	33	{
	34	int i;
	35	for (i = 0; i < 40; i++)
	36	if (*hex++ != '0')
	37	return 0;
	38	return 1;
	39	}
	40
2eca23da LT	41	static int verify_old_ref(const char name, char hex_contents)
	42	{
	43	int fd, ret;
	44	char buffer[60];
	45
f65fdf04 LT	46	if (is_all_zeroes(hex_contents))
f65fdf04 LT	47	return 0;
2eca23da LT	48	fd = open(name, O_RDONLY);
	49	if (fd < 0)
	50	return -1;
	51	ret = read(fd, buffer, 40);
	52	close(fd);
	53	if (ret != 40)
	54	return -1;
	55	if (memcmp(buffer, hex_contents, 40))
	56	return -1;
	57	return 0;
	58	}
	59
b1bf95bb JW	60	static char update_hook[] = "hooks/update";
	61
	62	static int run_update_hook(const char *refname,
	63	char old_hex, char new_hex)
	64	{
	65	int code;
	66
	67	if (access(update_hook, X_OK) < 0)
	68	return 0;
	69	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	70	switch (code) {
	71	case 0:
	72	return 0;
	73	case -ERR_RUN_COMMAND_FORK:
	74	die("hook fork failed");
	75	case -ERR_RUN_COMMAND_EXEC:
	76	die("hook execute failed");
	77	case -ERR_RUN_COMMAND_WAITPID:
	78	die("waitpid failed");
	79	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	80	die("waitpid is confused");
	81	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
7246ed43	82	fprintf(stderr, "%s died of signal\n", update_hook);
b1bf95bb JW	83	return -1;
	84	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	85	die("%s died strangely", update_hook);
	86	default:
	87	error("%s exited with error code %d", update_hook, -code);
	88	return -code;
	89	}
	90	}
	91
19614330 JH	92	static int update(const char *name,
19614330 JH	93	unsigned char old_sha1, unsigned char new_sha1)
2eca23da LT	94	{
	95	char new_hex[60], old_hex, lock_name;
	96	int newfd, namelen, written;
	97
d8a1deec JH	98	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5))
	99	return error("refusing to create funny ref '%s' locally",
	100	name);
	101
2eca23da LT	102	namelen = strlen(name);
	103	lock_name = xmalloc(namelen + 10);
	104	memcpy(lock_name, name, namelen);
	105	memcpy(lock_name + namelen, ".lock", 6);
	106
	107	strcpy(new_hex, sha1_to_hex(new_sha1));
2eca23da LT	108	old_hex = sha1_to_hex(old_sha1);
2eca23da LT	109	if (!has_sha1_file(new_sha1))
19614330 JH	110	return error("unpack should have generated %s, "
19614330 JH	111	"but I can't find it!", new_hex);
2eca23da	112
29f3b3de JH	113	safe_create_leading_directories(lock_name);
29f3b3de JH	114
f312de01	115	newfd = open(lock_name, O_CREAT \| O_EXCL \| O_WRONLY, 0666);
2eca23da	116	if (newfd < 0)
19614330 JH	117	return error("unable to create %s (%s)",
19614330 JH	118	lock_name, strerror(errno));
f65fdf04 LT	119
	120	/* Write the ref with an ending '\n' */
	121	new_hex[40] = '\n';
	122	new_hex[41] = 0;
2eca23da	123	written = write(newfd, new_hex, 41);
f65fdf04 LT	124	/* Remove the '\n' again */
	125	new_hex[40] = 0;
	126
2eca23da LT	127	close(newfd);
	128	if (written != 41) {
	129	unlink(lock_name);
19614330	130	return error("unable to write %s", lock_name);
2eca23da LT	131	}
	132	if (verify_old_ref(name, old_hex) < 0) {
	133	unlink(lock_name);
19614330	134	return error("%s changed during push", name);
2eca23da	135	}
b1bf95bb JW	136	if (run_update_hook(name, old_hex, new_hex)) {
b1bf95bb JW	137	unlink(lock_name);
19614330	138	return error("hook declined to update %s\n", name);
b1bf95bb JW	139	}
b1bf95bb JW	140	else if (rename(lock_name, name) < 0) {
2eca23da	141	unlink(lock_name);
19614330	142	return error("unable to replace %s", name);
2eca23da	143	}
19614330	144	else {
b1bf95bb	145	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330 JH	146	return 0;
19614330 JH	147	}
2eca23da LT	148	}
2eca23da LT	149
19614330 JH	150	static char update_post_hook[] = "hooks/post-update";
	151
	152	static void run_update_post_hook(struct command *cmd)
	153	{
	154	struct command *cmd_p;
	155	int argc;
	156	char **argv;
	157
	158	if (access(update_post_hook, X_OK) < 0)
	159	return;
	160	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
	161	if (!cmd_p->updated)
	162	continue;
	163	argc++;
	164	}
	165	argv = xmalloc(sizeof(argv) (1 + argc));
	166	argv[0] = update_post_hook;
	167
	168	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
	169	if (!cmd_p->updated)
	170	continue;
	171	argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1);
	172	strcpy(argv[argc], cmd_p->ref_name);
	173	argc++;
	174	}
	175	argv[argc] = NULL;
128aed68	176	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
19614330	177	}
2eca23da	178
575f4974 LT	179	/*
	180	* This gets called after(if) we've successfully
	181	* unpacked the data payload.
	182	*/
	183	static void execute_commands(void)
	184	{
eb1af2df LT	185	struct command *cmd = commands;
	186
	187	while (cmd) {
19614330 JH	188	cmd->updated = !update(cmd->ref_name,
19614330 JH	189	cmd->old_sha1, cmd->new_sha1);
eb1af2df	190	cmd = cmd->next;
575f4974	191	}
19614330	192	run_update_post_hook(commands);
575f4974 LT	193	}
	194
	195	static void read_head_info(void)
	196	{
eb1af2df	197	struct command **p = &commands;
575f4974 LT	198	for (;;) {
575f4974 LT	199	static char line[1000];
eb1af2df LT	200	unsigned char old_sha1[20], new_sha1[20];
	201	struct command *cmd;
	202	int len;
	203
	204	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	205	if (!len)
575f4974 LT	206	break;
eb1af2df LT	207	if (line[len-1] == '\n')
	208	line[--len] = 0;
	209	if (len < 83 \|\|
	210	line[40] != ' ' \|\|
	211	line[81] != ' ' \|\|
	212	get_sha1_hex(line, old_sha1) \|\|
	213	get_sha1_hex(line + 41, new_sha1))
	214	die("protocol error: expected old/new/ref, got '%s'", line);
	215	cmd = xmalloc(sizeof(struct command) + len - 80);
	216	memcpy(cmd->old_sha1, old_sha1, 20);
	217	memcpy(cmd->new_sha1, new_sha1, 20);
	218	memcpy(cmd->ref_name, line + 82, len - 81);
	219	cmd->next = NULL;
	220	*p = cmd;
	221	p = &cmd->next;
575f4974 LT	222	}
	223	}
	224
	225	static void unpack(void)
	226	{
b1bf95bb JW	227	int code = run_command(unpacker, NULL);
	228	switch (code) {
	229	case 0:
c742b813	230	return;
b1bf95bb	231	case -ERR_RUN_COMMAND_FORK:
575f4974	232	die("unpack fork failed");
b1bf95bb	233	case -ERR_RUN_COMMAND_EXEC:
575f4974	234	die("unpack execute failed");
b1bf95bb JW	235	case -ERR_RUN_COMMAND_WAITPID:
	236	die("waitpid failed");
	237	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	238	die("waitpid is confused");
	239	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	240	die("%s died of signal", unpacker);
	241	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	242	die("%s died strangely", unpacker);
	243	default:
	244	die("%s exited with error code %d", unpacker, -code);
575f4974 LT	245	}
	246	}
	247
	248	int main(int argc, char **argv)
	249	{
d0efc8a7	250	int i;
8d630132	251	char *dir = NULL;
575f4974 LT	252
	253	argv++;
	254	for (i = 1; i < argc; i++) {
8d630132	255	char arg = argv++;
575f4974 LT	256
575f4974 LT	257	if (*arg == '-') {
575f4974 LT	258	/* Do flag handling here */
	259	usage(receive_pack_usage);
	260	}
d0efc8a7 LT	261	if (dir)
d0efc8a7 LT	262	usage(receive_pack_usage);
575f4974	263	dir = arg;
575f4974 LT	264	}
	265	if (!dir)
	266	usage(receive_pack_usage);
	267
8d630132 AE	268	if(!enter_repo(dir, 0))
8d630132 AE	269	die("'%s': unable to chdir or not a git archive", dir);
575f4974	270
8a65ff76	271	write_head_info();
575f4974 LT	272
575f4974 LT	273	/* EOF */
f3a3214e	274	packet_flush(1);
575f4974 LT	275
575f4974 LT	276	read_head_info();
7f8e9828 LT	277	if (commands) {
	278	unpack();
	279	execute_commands();
	280	}
575f4974 LT	281	return 0;
575f4974 LT	282	}