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

#include "cache.h"
#include "pack.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "commit.h"
#include "object.h"

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

static int deny_non_fast_forwards = 0;
static int receive_unpack_limit = -1;
static int transfer_unpack_limit = -1;
static int unpack_limit = 100;
static int report_status;

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

static int receive_pack_config(const char *var, const char *value)
{
	if (strcmp(var, "receive.denynonfastforwards") == 0) {
		deny_non_fast_forwards = git_config_bool(var, value);
		return 0;
	}

	if (strcmp(var, "receive.unpacklimit") == 0) {
		receive_unpack_limit = git_config_int(var, value);
		return 0;
	}

	if (strcmp(var, "transfer.unpacklimit") == 0) {
		transfer_unpack_limit = git_config_int(var, value);
		return 0;
	}

	return git_default_config(var, value);
}

static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
	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, NULL);
	if (!capabilities_sent)
		show_ref("capabilities^{}", null_sha1, 0, NULL);

}

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 const char pre_receive_hook[] = "hooks/pre-receive";
static const char post_receive_hook[] = "hooks/post-receive";

static int hook_status(int code, const char *hook_name)
{
	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_PIPE:
		return error("hook pipe 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", hook_name);
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		return error("%s died strangely", hook_name);
	default:
		error("%s exited with error code %d", hook_name, -code);
		return -code;
	}
}

static int run_hook(const char *hook_name)
{
	static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
	struct command *cmd;
	struct child_process proc;
	const char *argv[2];
	int have_input = 0, code;

	for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
		if (!cmd->error_string)
			have_input = 1;
	}

	if (!have_input || access(hook_name, X_OK) < 0)
		return 0;

	argv[0] = hook_name;
	argv[1] = NULL;

	memset(&proc, 0, sizeof(proc));
	proc.argv = argv;
	proc.in = -1;
	proc.stdout_to_stderr = 1;

	code = start_command(&proc);
	if (code)
		return hook_status(code, hook_name);
	for (cmd = commands; cmd; cmd = cmd->next) {
		if (!cmd->error_string) {
			size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
				sha1_to_hex(cmd->old_sha1),
				sha1_to_hex(cmd->new_sha1),
				cmd->ref_name);
			if (write_in_full(proc.in, buf, n) != n)
				break;
		}
	}
	return hook_status(finish_command(&proc), hook_name);
}

static int run_update_hook(struct command *cmd)
{
	static const char update_hook[] = "hooks/update";
	struct child_process proc;
	const char *argv[5];

	if (access(update_hook, X_OK) < 0)
		return 0;

	argv[0] = update_hook;
	argv[1] = cmd->ref_name;
	argv[2] = sha1_to_hex(cmd->old_sha1);
	argv[3] = sha1_to_hex(cmd->new_sha1);
	argv[4] = NULL;

	memset(&proc, 0, sizeof(proc));
	proc.argv = argv;
	proc.no_stdin = 1;
	proc.stdout_to_stderr = 1;

	return hook_status(run_command(&proc), update_hook);
}

static const char *update(struct command *cmd)
{
	const char *name = cmd->ref_name;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;
	struct ref_lock *lock;

	if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
		error("refusing to create funny ref '%s' remotely", name);
		return "funny refname";
	}

	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
		error("unpack should have generated %s, "
		      "but I can't find it!", sha1_to_hex(new_sha1));
		return "bad pack";
	}
	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !prefixcmp(name, "refs/heads/")) {
		struct commit *old_commit, *new_commit;
		struct commit_list *bases, *ent;

		old_commit = (struct commit *)parse_object(old_sha1);
		new_commit = (struct commit *)parse_object(new_sha1);
		bases = get_merge_bases(old_commit, new_commit, 1);
		for (ent = bases; ent; ent = ent->next)
			if (!hashcmp(old_sha1, ent->item->object.sha1))
				break;
		free_commit_list(bases);
		if (!ent) {
			error("denying non-fast forward %s"
			      " (you should pull first)", name);
			return "non-fast forward";
		}
	}
	if (run_update_hook(cmd)) {
		error("hook declined to update %s", name);
		return "hook declined";
	}

	if (is_null_sha1(new_sha1)) {
		if (!parse_object(old_sha1)) {
			warning ("Allowing deletion of corrupt ref.");
			old_sha1 = NULL;
		}
		if (delete_ref(name, old_sha1)) {
			error("failed to delete %s", name);
			return "failed to delete";
		}
		return NULL; /* good */
	}
	else {
		lock = lock_any_ref_for_update(name, old_sha1, 0);
		if (!lock) {
			error("failed to lock %s", name);
			return "failed to lock";
		}
		if (write_ref_sha1(lock, new_sha1, "push")) {
			return "failed to write"; /* error() already called */
		}
		return NULL; /* good */
	}
}

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;

	for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
		if (cmd_p->error_string)
			continue;
		argc++;
	}
	if (!argc || access(update_post_hook, X_OK) < 0)
		return;
	argv = xmalloc(sizeof(*argv) * (2 + 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(argv, RUN_COMMAND_NO_STDIN
		| RUN_COMMAND_STDOUT_TO_STDERR);
}

static void execute_commands(const char *unpacker_error)
{
	struct command *cmd = commands;

	if (unpacker_error) {
		while (cmd) {
			cmd->error_string = "n/a (unpacker error)";
			cmd = cmd->next;
		}
		return;
	}

	if (run_hook(pre_receive_hook)) {
		while (cmd) {
			cmd->error_string = "pre-receive hook declined";
			cmd = cmd->next;
		}
		return;
	}

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

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

static const char *parse_pack_header(struct pack_header *hdr)
{
	switch (read_pack_header(0, hdr)) {
	case PH_ERROR_EOF:
		return "eof before pack header was fully read";

	case PH_ERROR_PACK_SIGNATURE:
		return "protocol error (pack signature mismatch detected)";

	case PH_ERROR_PROTOCOL:
		return "protocol error (pack version unsupported)";

	default:
		return "unknown error in parse_pack_header";

	case 0:
		return NULL;
	}
}

static const char *pack_lockfile;

static const char *unpack(void)
{
	struct pack_header hdr;
	const char *hdr_err;
	char hdr_arg[38];

	hdr_err = parse_pack_header(&hdr);
	if (hdr_err)
		return hdr_err;
	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
			ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));

	if (ntohl(hdr.hdr_entries) < unpack_limit) {
		int code;
		const char *unpacker[3];
		unpacker[0] = "unpack-objects";
		unpacker[1] = hdr_arg;
		unpacker[2] = NULL;
		code = run_command_v_opt(unpacker, RUN_GIT_CMD);
		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:
			return "unpacker exited with error code";
		}
	} else {
		const char *keeper[6];
		int s, status;
		char keep_arg[256];
		struct child_process ip;

		s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
		if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
			strcpy(keep_arg + s, "localhost");

		keeper[0] = "index-pack";
		keeper[1] = "--stdin";
		keeper[2] = "--fix-thin";
		keeper[3] = hdr_arg;
		keeper[4] = keep_arg;
		keeper[5] = NULL;
		memset(&ip, 0, sizeof(ip));
		ip.argv = keeper;
		ip.out = -1;
		ip.git_cmd = 1;
		if (start_command(&ip))
			return "index-pack fork failed";
		pack_lockfile = index_pack_lockfile(ip.out);
		status = finish_command(&ip);
		if (!status) {
			reprepare_packed_git();
			return NULL;
		}
		return "index-pack abnormal exit";
	}
}

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);
}

static int delete_only(struct command *cmd)
{
	while (cmd) {
		if (!is_null_sha1(cmd->new_sha1))
			return 0;
		cmd = cmd->next;
	}
	return 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);

	if (is_repository_shallow())
		die("attempt to push into a shallow repository");

	git_config(receive_pack_config);

	if (0 <= transfer_unpack_limit)
		unpack_limit = transfer_unpack_limit;
	else if (0 <= receive_unpack_limit)
		unpack_limit = receive_unpack_limit;

	write_head_info();

	/* EOF */
	packet_flush(1);

	read_head_info();
	if (commands) {
		const char *unpack_status = NULL;

		if (!delete_only(commands))
			unpack_status = unpack();
		execute_commands(unpack_status);
		if (pack_lockfile)
			unlink(pack_lockfile);
		if (report_status)
			report(unpack_status);
		run_hook(post_receive_hook);
		run_update_post_hook(commands);
	}
	return 0;
}
Commit	Line	Data
575f4974	1	#include "cache.h"
fc04c412	2	#include "pack.h"
8a65ff76	3	#include "refs.h"
f3a3214e	4	#include "pkt-line.h"
b1bf95bb	5	#include "run-command.h"
576162a4	6	#include "exec_cmd.h"
11031d7e JS	7	#include "commit.h"
11031d7e JS	8	#include "object.h"
575f4974	9
d0efc8a7	10	static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
575f4974	11
6fb75bed	12	static int deny_non_fast_forwards = 0;
e28714c5 JH	13	static int receive_unpack_limit = -1;
e28714c5 JH	14	static int transfer_unpack_limit = -1;
46732fae	15	static int unpack_limit = 100;
96f1e58f	16	static int report_status;
cfee10a7	17
d4f694ba	18	static char capabilities[] = " report-status delete-refs ";
96f1e58f	19	static int capabilities_sent;
cfee10a7	20
6fb75bed SP	21	static int receive_pack_config(const char var, const char value)
6fb75bed SP	22	{
e28714c5	23	if (strcmp(var, "receive.denynonfastforwards") == 0) {
6fb75bed SP	24	deny_non_fast_forwards = git_config_bool(var, value);
	25	return 0;
	26	}
	27
e28714c5 JH	28	if (strcmp(var, "receive.unpacklimit") == 0) {
e28714c5 JH	29	receive_unpack_limit = git_config_int(var, value);
fc04c412 SP	30	return 0;
	31	}
	32
e28714c5 JH	33	if (strcmp(var, "transfer.unpacklimit") == 0) {
	34	transfer_unpack_limit = git_config_int(var, value);
	35	return 0;
	36	}
	37
	38	return git_default_config(var, value);
6fb75bed SP	39	}
6fb75bed SP	40
8da19775	41	static int show_ref(const char path, const unsigned char sha1, int flag, void *cb_data)
575f4974	42	{
cfee10a7 JH	43	if (capabilities_sent)
	44	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	45	else
	46	packet_write(1, "%s %s%c%s\n",
	47	sha1_to_hex(sha1), path, 0, capabilities);
	48	capabilities_sent = 1;
8a65ff76	49	return 0;
575f4974 LT	50	}
575f4974 LT	51
8a65ff76	52	static void write_head_info(void)
575f4974	53	{
cb5d709f	54	for_each_ref(show_ref, NULL);
cfee10a7	55	if (!capabilities_sent)
8da19775	56	show_ref("capabilities^{}", null_sha1, 0, NULL);
cfee10a7	57
575f4974 LT	58	}
575f4974 LT	59
eb1af2df LT	60	struct command {
eb1af2df LT	61	struct command *next;
cfee10a7	62	const char *error_string;
eb1af2df LT	63	unsigned char old_sha1[20];
eb1af2df LT	64	unsigned char new_sha1[20];
8f1d2e6f	65	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	66	};
575f4974 LT	67
96f1e58f	68	static struct command *commands;
575f4974	69
05ef58ec SP	70	static const char pre_receive_hook[] = "hooks/pre-receive";
05ef58ec SP	71	static const char post_receive_hook[] = "hooks/post-receive";
b1bf95bb	72
6c319a22 SP	73	static int hook_status(int code, const char *hook_name)
	74	{
	75	switch (code) {
	76	case 0:
	77	return 0;
	78	case -ERR_RUN_COMMAND_FORK:
	79	return error("hook fork failed");
	80	case -ERR_RUN_COMMAND_EXEC:
	81	return error("hook execute failed");
f43cd49f SP	82	case -ERR_RUN_COMMAND_PIPE:
f43cd49f SP	83	return error("hook pipe failed");
6c319a22 SP	84	case -ERR_RUN_COMMAND_WAITPID:
	85	return error("waitpid failed");
	86	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	87	return error("waitpid is confused");
	88	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	89	return error("%s died of signal", hook_name);
	90	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	91	return error("%s died strangely", hook_name);
	92	default:
	93	error("%s exited with error code %d", hook_name, -code);
	94	return -code;
	95	}
	96	}
	97
f43cd49f	98	static int run_hook(const char *hook_name)
b1bf95bb	99	{
f43cd49f	100	static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
c8dd2771	101	struct command *cmd;
f43cd49f SP	102	struct child_process proc;
	103	const char *argv[2];
	104	int have_input = 0, code;
c8dd2771	105
f43cd49f	106	for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
c8dd2771	107	if (!cmd->error_string)
f43cd49f	108	have_input = 1;
c8dd2771	109	}
b1bf95bb	110
f43cd49f	111	if (!have_input \|\| access(hook_name, X_OK) < 0)
b1bf95bb	112	return 0;
c8dd2771	113
c8dd2771	114	argv[0] = hook_name;
f43cd49f SP	115	argv[1] = NULL;
	116
	117	memset(&proc, 0, sizeof(proc));
	118	proc.argv = argv;
	119	proc.in = -1;
	120	proc.stdout_to_stderr = 1;
	121
	122	code = start_command(&proc);
	123	if (code)
	124	return hook_status(code, hook_name);
	125	for (cmd = commands; cmd; cmd = cmd->next) {
c8dd2771	126	if (!cmd->error_string) {
f43cd49f SP	127	size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
	128	sha1_to_hex(cmd->old_sha1),
	129	sha1_to_hex(cmd->new_sha1),
	130	cmd->ref_name);
	131	if (write_in_full(proc.in, buf, n) != n)
	132	break;
c8dd2771	133	}
c8dd2771	134	}
f43cd49f	135	return hook_status(finish_command(&proc), hook_name);
b1bf95bb JW	136	}
b1bf95bb JW	137
1d9e8b56 SP	138	static int run_update_hook(struct command *cmd)
	139	{
	140	static const char update_hook[] = "hooks/update";
	141	struct child_process proc;
	142	const char *argv[5];
	143
	144	if (access(update_hook, X_OK) < 0)
	145	return 0;
	146
	147	argv[0] = update_hook;
	148	argv[1] = cmd->ref_name;
	149	argv[2] = sha1_to_hex(cmd->old_sha1);
	150	argv[3] = sha1_to_hex(cmd->new_sha1);
	151	argv[4] = NULL;
	152
	153	memset(&proc, 0, sizeof(proc));
	154	proc.argv = argv;
	155	proc.no_stdin = 1;
	156	proc.stdout_to_stderr = 1;
	157
	158	return hook_status(run_command(&proc), update_hook);
	159	}
	160
8aaf7d64	161	static const char update(struct command cmd)
2eca23da	162	{
cfee10a7 JH	163	const char *name = cmd->ref_name;
	164	unsigned char *old_sha1 = cmd->old_sha1;
	165	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc	166	struct ref_lock *lock;
2eca23da	167
cc44c765	168	if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
0b8293f6	169	error("refusing to create funny ref '%s' remotely", name);
8aaf7d64	170	return "funny refname";
cfee10a7	171	}
d8a1deec	172
d4f694ba	173	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
8aaf7d64 SP	174	error("unpack should have generated %s, "
	175	"but I can't find it!", sha1_to_hex(new_sha1));
	176	return "bad pack";
cfee10a7	177	}
d4f694ba	178	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	179	!is_null_sha1(old_sha1) &&
cc44c765	180	!prefixcmp(name, "refs/heads/")) {
11031d7e	181	struct commit old_commit, new_commit;
9edd7e46	182	struct commit_list bases, ent;
11031d7e JS	183
	184	old_commit = (struct commit *)parse_object(old_sha1);
	185	new_commit = (struct commit *)parse_object(new_sha1);
9edd7e46 JS	186	bases = get_merge_bases(old_commit, new_commit, 1);
	187	for (ent = bases; ent; ent = ent->next)
	188	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	189	break;
9edd7e46	190	free_commit_list(bases);
8aaf7d64 SP	191	if (!ent) {
	192	error("denying non-fast forward %s"
	193	" (you should pull first)", name);
	194	return "non-fast forward";
	195	}
11031d7e	196	}
1d9e8b56	197	if (run_update_hook(cmd)) {
8aaf7d64 SP	198	error("hook declined to update %s", name);
8aaf7d64 SP	199	return "hook declined";
b1bf95bb	200	}
3159c8dc	201
d4f694ba	202	if (is_null_sha1(new_sha1)) {
28391a80 JS	203	if (!parse_object(old_sha1)) {
	204	warning ("Allowing deletion of corrupt ref.");
	205	old_sha1 = NULL;
	206	}
d4f694ba	207	if (delete_ref(name, old_sha1)) {
8aaf7d64 SP	208	error("failed to delete %s", name);
8aaf7d64 SP	209	return "failed to delete";
d4f694ba	210	}
8aaf7d64	211	return NULL; /* good */
d4f694ba JH	212	}
d4f694ba JH	213	else {
68db31cc	214	lock = lock_any_ref_for_update(name, old_sha1, 0);
d4f694ba	215	if (!lock) {
8aaf7d64 SP	216	error("failed to lock %s", name);
8aaf7d64 SP	217	return "failed to lock";
d4f694ba	218	}
ef203f08	219	if (write_ref_sha1(lock, new_sha1, "push")) {
8aaf7d64	220	return "failed to write"; /* error() already called */
ef203f08	221	}
8aaf7d64	222	return NULL; /* good */
19614330	223	}
2eca23da LT	224	}
2eca23da LT	225
19614330 JH	226	static char update_post_hook[] = "hooks/post-update";
	227
	228	static void run_update_post_hook(struct command *cmd)
	229	{
	230	struct command *cmd_p;
	231	int argc;
9201c707	232	const char **argv;
19614330	233
3e6e152c	234	for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	235	if (cmd_p->error_string)
19614330 JH	236	continue;
	237	argc++;
	238	}
3e6e152c SP	239	if (!argc \|\| access(update_post_hook, X_OK) < 0)
	240	return;
	241	argv = xmalloc(sizeof(argv) (2 + argc));
19614330 JH	242	argv[0] = update_post_hook;
	243
	244	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	245	char *p;
cfee10a7	246	if (cmd_p->error_string)
19614330	247	continue;
9201c707 JH	248	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	249	strcpy(p, cmd_p->ref_name);
	250	argv[argc] = p;
19614330 JH	251	argc++;
	252	}
	253	argv[argc] = NULL;
95d3c4f5 SP	254	run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
95d3c4f5 SP	255	\| RUN_COMMAND_STDOUT_TO_STDERR);
19614330	256	}
2eca23da	257
8aaf7d64	258	static void execute_commands(const char *unpacker_error)
575f4974	259	{
eb1af2df	260	struct command *cmd = commands;
8aaf7d64 SP	261
	262	if (unpacker_error) {
	263	while (cmd) {
	264	cmd->error_string = "n/a (unpacker error)";
	265	cmd = cmd->next;
	266	}
	267	return;
	268	}
	269
f43cd49f	270	if (run_hook(pre_receive_hook)) {
05ef58ec SP	271	while (cmd) {
	272	cmd->error_string = "pre-receive hook declined";
	273	cmd = cmd->next;
	274	}
	275	return;
	276	}
	277
eb1af2df	278	while (cmd) {
8aaf7d64	279	cmd->error_string = update(cmd);
eb1af2df	280	cmd = cmd->next;
575f4974 LT	281	}
	282	}
	283
	284	static void read_head_info(void)
	285	{
eb1af2df	286	struct command **p = &commands;
575f4974 LT	287	for (;;) {
575f4974 LT	288	static char line[1000];
eb1af2df LT	289	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	290	struct command *cmd;
cfee10a7 JH	291	char *refname;
cfee10a7 JH	292	int len, reflen;
eb1af2df LT	293
eb1af2df LT	294	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	295	if (!len)
575f4974 LT	296	break;
eb1af2df LT	297	if (line[len-1] == '\n')
	298	line[--len] = 0;
	299	if (len < 83 \|\|
	300	line[40] != ' ' \|\|
	301	line[81] != ' ' \|\|
	302	get_sha1_hex(line, old_sha1) \|\|
	303	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	304	die("protocol error: expected old/new/ref, got '%s'",
	305	line);
	306
	307	refname = line + 82;
	308	reflen = strlen(refname);
	309	if (reflen + 82 < len) {
	310	if (strstr(refname + reflen + 1, "report-status"))
	311	report_status = 1;
	312	}
eb1af2df	313	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	314	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	315	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	316	memcpy(cmd->ref_name, line + 82, len - 81);
8aaf7d64	317	cmd->error_string = NULL;
eb1af2df LT	318	cmd->next = NULL;
	319	*p = cmd;
	320	p = &cmd->next;
575f4974 LT	321	}
	322	}
	323
fc04c412 SP	324	static const char parse_pack_header(struct pack_header hdr)
fc04c412 SP	325	{
a69e5429 JH	326	switch (read_pack_header(0, hdr)) {
	327	case PH_ERROR_EOF:
	328	return "eof before pack header was fully read";
	329
	330	case PH_ERROR_PACK_SIGNATURE:
fc04c412	331	return "protocol error (pack signature mismatch detected)";
a69e5429 JH	332
a69e5429 JH	333	case PH_ERROR_PROTOCOL:
fc04c412	334	return "protocol error (pack version unsupported)";
a69e5429 JH	335
	336	default:
	337	return "unknown error in parse_pack_header";
	338
	339	case 0:
	340	return NULL;
	341	}
fc04c412 SP	342	}
fc04c412 SP	343
576162a4 NP	344	static const char *pack_lockfile;
576162a4 NP	345
861ed121	346	static const char *unpack(void)
575f4974	347	{
fc04c412 SP	348	struct pack_header hdr;
	349	const char *hdr_err;
	350	char hdr_arg[38];
fc04c412 SP	351
	352	hdr_err = parse_pack_header(&hdr);
	353	if (hdr_err)
	354	return hdr_err;
	355	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	356	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	357
	358	if (ntohl(hdr.hdr_entries) < unpack_limit) {
576162a4	359	int code;
fc04c412 SP	360	const char *unpacker[3];
	361	unpacker[0] = "unpack-objects";
	362	unpacker[1] = hdr_arg;
	363	unpacker[2] = NULL;
9b0b5093	364	code = run_command_v_opt(unpacker, RUN_GIT_CMD);
576162a4	365	switch (code) {
fc04c412 SP	366	case 0:
	367	return NULL;
	368	case -ERR_RUN_COMMAND_FORK:
	369	return "unpack fork failed";
	370	case -ERR_RUN_COMMAND_EXEC:
	371	return "unpack execute failed";
	372	case -ERR_RUN_COMMAND_WAITPID:
	373	return "waitpid failed";
	374	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	375	return "waitpid is confused";
	376	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	377	return "unpacker died of signal";
	378	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	379	return "unpacker died strangely";
	380	default:
	381	return "unpacker exited with error code";
576162a4 NP	382	}
	383	} else {
	384	const char *keeper[6];
106764e6	385	int s, status;
576162a4	386	char keep_arg[256];
e8016abf	387	struct child_process ip;
576162a4 NP	388
	389	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	390	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	391	strcpy(keep_arg + s, "localhost");
	392
	393	keeper[0] = "index-pack";
	394	keeper[1] = "--stdin";
	395	keeper[2] = "--fix-thin";
	396	keeper[3] = hdr_arg;
	397	keeper[4] = keep_arg;
	398	keeper[5] = NULL;
e8016abf SP	399	memset(&ip, 0, sizeof(ip));
	400	ip.argv = keeper;
	401	ip.out = -1;
	402	ip.git_cmd = 1;
	403	if (start_command(&ip))
576162a4	404	return "index-pack fork failed";
106764e6	405	pack_lockfile = index_pack_lockfile(ip.out);
e8016abf SP	406	status = finish_command(&ip);
e8016abf SP	407	if (!status) {
576162a4 NP	408	reprepare_packed_git();
	409	return NULL;
	410	}
	411	return "index-pack abnormal exit";
cfee10a7 JH	412	}
	413	}
	414
	415	static void report(const char *unpack_status)
	416	{
	417	struct command *cmd;
	418	packet_write(1, "unpack %s\n",
	419	unpack_status ? unpack_status : "ok");
	420	for (cmd = commands; cmd; cmd = cmd->next) {
	421	if (!cmd->error_string)
	422	packet_write(1, "ok %s\n",
	423	cmd->ref_name);
	424	else
	425	packet_write(1, "ng %s %s\n",
	426	cmd->ref_name, cmd->error_string);
575f4974	427	}
cfee10a7	428	packet_flush(1);
575f4974 LT	429	}
575f4974 LT	430
d4f694ba JH	431	static int delete_only(struct command *cmd)
	432	{
	433	while (cmd) {
	434	if (!is_null_sha1(cmd->new_sha1))
	435	return 0;
	436	cmd = cmd->next;
	437	}
	438	return 1;
	439	}
	440
575f4974 LT	441	int main(int argc, char **argv)
575f4974 LT	442	{
d0efc8a7	443	int i;
8d630132	444	char *dir = NULL;
575f4974 LT	445
	446	argv++;
	447	for (i = 1; i < argc; i++) {
8d630132	448	char arg = argv++;
575f4974 LT	449
575f4974 LT	450	if (*arg == '-') {
575f4974 LT	451	/* Do flag handling here */
	452	usage(receive_pack_usage);
	453	}
d0efc8a7 LT	454	if (dir)
d0efc8a7 LT	455	usage(receive_pack_usage);
575f4974	456	dir = arg;
575f4974 LT	457	}
	458	if (!dir)
	459	usage(receive_pack_usage);
	460
3159c8dc	461	if (!enter_repo(dir, 0))
8d630132	462	die("'%s': unable to chdir or not a git archive", dir);
575f4974	463
a0022eeb JH	464	if (is_repository_shallow())
	465	die("attempt to push into a shallow repository");
	466
6fb75bed SP	467	git_config(receive_pack_config);
6fb75bed SP	468
e28714c5 JH	469	if (0 <= transfer_unpack_limit)
	470	unpack_limit = transfer_unpack_limit;
	471	else if (0 <= receive_unpack_limit)
	472	unpack_limit = receive_unpack_limit;
	473
8a65ff76	474	write_head_info();
575f4974 LT	475
575f4974 LT	476	/* EOF */
f3a3214e	477	packet_flush(1);
575f4974 LT	478
575f4974 LT	479	read_head_info();
7f8e9828	480	if (commands) {
d4f694ba JH	481	const char *unpack_status = NULL;
	482
	483	if (!delete_only(commands))
	484	unpack_status = unpack();
8aaf7d64	485	execute_commands(unpack_status);
576162a4 NP	486	if (pack_lockfile)
576162a4 NP	487	unlink(pack_lockfile);
cfee10a7 JH	488	if (report_status)
cfee10a7 JH	489	report(unpack_status);
f43cd49f	490	run_hook(post_receive_hook);
8e663d9e	491	run_update_post_hook(commands);
7f8e9828	492	}
575f4974 LT	493	return 0;
575f4974 LT	494	}