[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;
		}
	}
	close(proc.in);
	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;

	/* only refs/... are allowed */
	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 object *old_object, *new_object;
		struct commit *old_commit, *new_commit;
		struct commit_list *bases, *ent;

		old_object = parse_object(old_sha1);
		new_object = parse_object(new_sha1);

		if (!old_object || !new_object ||
		    old_object->type != OBJ_COMMIT ||
		    new_object->type != OBJ_COMMIT) {
			error("bad sha1 objects for %s", name);
			return "bad ref";
		}
		old_commit = (struct commit *)old_object;
		new_commit = (struct commit *)new_object;
		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);
		close(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);

	setup_path(NULL);

	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	}
e72ae288	135	close(proc.in);
f43cd49f	136	return hook_status(finish_command(&proc), hook_name);
b1bf95bb JW	137	}
b1bf95bb JW	138
1d9e8b56 SP	139	static int run_update_hook(struct command *cmd)
	140	{
	141	static const char update_hook[] = "hooks/update";
	142	struct child_process proc;
	143	const char *argv[5];
	144
	145	if (access(update_hook, X_OK) < 0)
	146	return 0;
	147
	148	argv[0] = update_hook;
	149	argv[1] = cmd->ref_name;
	150	argv[2] = sha1_to_hex(cmd->old_sha1);
	151	argv[3] = sha1_to_hex(cmd->new_sha1);
	152	argv[4] = NULL;
	153
	154	memset(&proc, 0, sizeof(proc));
	155	proc.argv = argv;
	156	proc.no_stdin = 1;
	157	proc.stdout_to_stderr = 1;
	158
	159	return hook_status(run_command(&proc), update_hook);
	160	}
	161
8aaf7d64	162	static const char update(struct command cmd)
2eca23da	163	{
cfee10a7 JH	164	const char *name = cmd->ref_name;
	165	unsigned char *old_sha1 = cmd->old_sha1;
	166	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc	167	struct ref_lock *lock;
2eca23da	168
061d6b9a MK	169	/* only refs/... are allowed */
061d6b9a MK	170	if (prefixcmp(name, "refs/") \|\| check_ref_format(name + 5)) {
0b8293f6	171	error("refusing to create funny ref '%s' remotely", name);
8aaf7d64	172	return "funny refname";
cfee10a7	173	}
d8a1deec	174
d4f694ba	175	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
8aaf7d64 SP	176	error("unpack should have generated %s, "
	177	"but I can't find it!", sha1_to_hex(new_sha1));
	178	return "bad pack";
cfee10a7	179	}
d4f694ba	180	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	181	!is_null_sha1(old_sha1) &&
cc44c765	182	!prefixcmp(name, "refs/heads/")) {
eab82707	183	struct object old_object, new_object;
11031d7e	184	struct commit old_commit, new_commit;
9edd7e46	185	struct commit_list bases, ent;
11031d7e	186
eab82707 MK	187	old_object = parse_object(old_sha1);
	188	new_object = parse_object(new_sha1);
	189
	190	if (!old_object \|\| !new_object \|\|
	191	old_object->type != OBJ_COMMIT \|\|
	192	new_object->type != OBJ_COMMIT) {
	193	error("bad sha1 objects for %s", name);
	194	return "bad ref";
	195	}
	196	old_commit = (struct commit *)old_object;
	197	new_commit = (struct commit *)new_object;
9edd7e46 JS	198	bases = get_merge_bases(old_commit, new_commit, 1);
	199	for (ent = bases; ent; ent = ent->next)
	200	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	201	break;
9edd7e46	202	free_commit_list(bases);
8aaf7d64 SP	203	if (!ent) {
	204	error("denying non-fast forward %s"
	205	" (you should pull first)", name);
	206	return "non-fast forward";
	207	}
11031d7e	208	}
1d9e8b56	209	if (run_update_hook(cmd)) {
8aaf7d64 SP	210	error("hook declined to update %s", name);
8aaf7d64 SP	211	return "hook declined";
b1bf95bb	212	}
3159c8dc	213
d4f694ba	214	if (is_null_sha1(new_sha1)) {
28391a80 JS	215	if (!parse_object(old_sha1)) {
	216	warning ("Allowing deletion of corrupt ref.");
	217	old_sha1 = NULL;
	218	}
d4f694ba	219	if (delete_ref(name, old_sha1)) {
8aaf7d64 SP	220	error("failed to delete %s", name);
8aaf7d64 SP	221	return "failed to delete";
d4f694ba	222	}
8aaf7d64	223	return NULL; /* good */
d4f694ba JH	224	}
d4f694ba JH	225	else {
68db31cc	226	lock = lock_any_ref_for_update(name, old_sha1, 0);
d4f694ba	227	if (!lock) {
8aaf7d64 SP	228	error("failed to lock %s", name);
8aaf7d64 SP	229	return "failed to lock";
d4f694ba	230	}
ef203f08	231	if (write_ref_sha1(lock, new_sha1, "push")) {
8aaf7d64	232	return "failed to write"; /* error() already called */
ef203f08	233	}
8aaf7d64	234	return NULL; /* good */
19614330	235	}
2eca23da LT	236	}
2eca23da LT	237
19614330 JH	238	static char update_post_hook[] = "hooks/post-update";
	239
	240	static void run_update_post_hook(struct command *cmd)
	241	{
	242	struct command *cmd_p;
	243	int argc;
9201c707	244	const char **argv;
19614330	245
3e6e152c	246	for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	247	if (cmd_p->error_string)
19614330 JH	248	continue;
	249	argc++;
	250	}
3e6e152c SP	251	if (!argc \|\| access(update_post_hook, X_OK) < 0)
	252	return;
	253	argv = xmalloc(sizeof(argv) (2 + argc));
19614330 JH	254	argv[0] = update_post_hook;
	255
	256	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	257	char *p;
cfee10a7	258	if (cmd_p->error_string)
19614330	259	continue;
9201c707 JH	260	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	261	strcpy(p, cmd_p->ref_name);
	262	argv[argc] = p;
19614330 JH	263	argc++;
	264	}
	265	argv[argc] = NULL;
95d3c4f5 SP	266	run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
95d3c4f5 SP	267	\| RUN_COMMAND_STDOUT_TO_STDERR);
19614330	268	}
2eca23da	269
8aaf7d64	270	static void execute_commands(const char *unpacker_error)
575f4974	271	{
eb1af2df	272	struct command *cmd = commands;
8aaf7d64 SP	273
	274	if (unpacker_error) {
	275	while (cmd) {
	276	cmd->error_string = "n/a (unpacker error)";
	277	cmd = cmd->next;
	278	}
	279	return;
	280	}
	281
f43cd49f	282	if (run_hook(pre_receive_hook)) {
05ef58ec SP	283	while (cmd) {
	284	cmd->error_string = "pre-receive hook declined";
	285	cmd = cmd->next;
	286	}
	287	return;
	288	}
	289
eb1af2df	290	while (cmd) {
8aaf7d64	291	cmd->error_string = update(cmd);
eb1af2df	292	cmd = cmd->next;
575f4974 LT	293	}
	294	}
	295
	296	static void read_head_info(void)
	297	{
eb1af2df	298	struct command **p = &commands;
575f4974 LT	299	for (;;) {
575f4974 LT	300	static char line[1000];
eb1af2df LT	301	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	302	struct command *cmd;
cfee10a7 JH	303	char *refname;
cfee10a7 JH	304	int len, reflen;
eb1af2df LT	305
eb1af2df LT	306	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	307	if (!len)
575f4974 LT	308	break;
eb1af2df LT	309	if (line[len-1] == '\n')
	310	line[--len] = 0;
	311	if (len < 83 \|\|
	312	line[40] != ' ' \|\|
	313	line[81] != ' ' \|\|
	314	get_sha1_hex(line, old_sha1) \|\|
	315	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	316	die("protocol error: expected old/new/ref, got '%s'",
	317	line);
	318
	319	refname = line + 82;
	320	reflen = strlen(refname);
	321	if (reflen + 82 < len) {
	322	if (strstr(refname + reflen + 1, "report-status"))
	323	report_status = 1;
	324	}
eb1af2df	325	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	326	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	327	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	328	memcpy(cmd->ref_name, line + 82, len - 81);
8aaf7d64	329	cmd->error_string = NULL;
eb1af2df LT	330	cmd->next = NULL;
	331	*p = cmd;
	332	p = &cmd->next;
575f4974 LT	333	}
	334	}
	335
fc04c412 SP	336	static const char parse_pack_header(struct pack_header hdr)
fc04c412 SP	337	{
a69e5429 JH	338	switch (read_pack_header(0, hdr)) {
	339	case PH_ERROR_EOF:
	340	return "eof before pack header was fully read";
	341
	342	case PH_ERROR_PACK_SIGNATURE:
fc04c412	343	return "protocol error (pack signature mismatch detected)";
a69e5429 JH	344
a69e5429 JH	345	case PH_ERROR_PROTOCOL:
fc04c412	346	return "protocol error (pack version unsupported)";
a69e5429 JH	347
	348	default:
	349	return "unknown error in parse_pack_header";
	350
	351	case 0:
	352	return NULL;
	353	}
fc04c412 SP	354	}
fc04c412 SP	355
576162a4 NP	356	static const char *pack_lockfile;
576162a4 NP	357
861ed121	358	static const char *unpack(void)
575f4974	359	{
fc04c412 SP	360	struct pack_header hdr;
	361	const char *hdr_err;
	362	char hdr_arg[38];
fc04c412 SP	363
	364	hdr_err = parse_pack_header(&hdr);
	365	if (hdr_err)
	366	return hdr_err;
	367	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	368	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	369
	370	if (ntohl(hdr.hdr_entries) < unpack_limit) {
9eb7a50b JH	371	int code;
	372	const char *unpacker[3];
	373	unpacker[0] = "unpack-objects";
	374	unpacker[1] = hdr_arg;
	375	unpacker[2] = NULL;
9b0b5093	376	code = run_command_v_opt(unpacker, RUN_GIT_CMD);
576162a4	377	switch (code) {
fc04c412 SP	378	case 0:
	379	return NULL;
	380	case -ERR_RUN_COMMAND_FORK:
	381	return "unpack fork failed";
	382	case -ERR_RUN_COMMAND_EXEC:
	383	return "unpack execute failed";
	384	case -ERR_RUN_COMMAND_WAITPID:
	385	return "waitpid failed";
	386	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	387	return "waitpid is confused";
	388	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	389	return "unpacker died of signal";
	390	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	391	return "unpacker died strangely";
	392	default:
	393	return "unpacker exited with error code";
576162a4 NP	394	}
576162a4 NP	395	} else {
9eb7a50b JH	396	const char *keeper[6];
9eb7a50b JH	397	int s, status;
576162a4	398	char keep_arg[256];
e8016abf	399	struct child_process ip;
576162a4 NP	400
	401	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	402	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	403	strcpy(keep_arg + s, "localhost");
	404
9eb7a50b JH	405	keeper[0] = "index-pack";
	406	keeper[1] = "--stdin";
	407	keeper[2] = "--fix-thin";
	408	keeper[3] = hdr_arg;
	409	keeper[4] = keep_arg;
	410	keeper[5] = NULL;
e8016abf SP	411	memset(&ip, 0, sizeof(ip));
	412	ip.argv = keeper;
	413	ip.out = -1;
	414	ip.git_cmd = 1;
	415	if (start_command(&ip))
576162a4	416	return "index-pack fork failed";
106764e6	417	pack_lockfile = index_pack_lockfile(ip.out);
e72ae288	418	close(ip.out);
e8016abf SP	419	status = finish_command(&ip);
e8016abf SP	420	if (!status) {
576162a4 NP	421	reprepare_packed_git();
	422	return NULL;
	423	}
	424	return "index-pack abnormal exit";
cfee10a7 JH	425	}
	426	}
	427
	428	static void report(const char *unpack_status)
	429	{
	430	struct command *cmd;
	431	packet_write(1, "unpack %s\n",
	432	unpack_status ? unpack_status : "ok");
	433	for (cmd = commands; cmd; cmd = cmd->next) {
	434	if (!cmd->error_string)
	435	packet_write(1, "ok %s\n",
	436	cmd->ref_name);
	437	else
	438	packet_write(1, "ng %s %s\n",
	439	cmd->ref_name, cmd->error_string);
575f4974	440	}
cfee10a7	441	packet_flush(1);
575f4974 LT	442	}
575f4974 LT	443
d4f694ba JH	444	static int delete_only(struct command *cmd)
	445	{
	446	while (cmd) {
	447	if (!is_null_sha1(cmd->new_sha1))
	448	return 0;
	449	cmd = cmd->next;
	450	}
	451	return 1;
	452	}
	453
575f4974 LT	454	int main(int argc, char **argv)
575f4974 LT	455	{
d0efc8a7	456	int i;
8d630132	457	char *dir = NULL;
575f4974 LT	458
	459	argv++;
	460	for (i = 1; i < argc; i++) {
8d630132	461	char arg = argv++;
575f4974 LT	462
575f4974 LT	463	if (*arg == '-') {
575f4974 LT	464	/* Do flag handling here */
	465	usage(receive_pack_usage);
	466	}
d0efc8a7 LT	467	if (dir)
d0efc8a7 LT	468	usage(receive_pack_usage);
575f4974	469	dir = arg;
575f4974 LT	470	}
	471	if (!dir)
	472	usage(receive_pack_usage);
	473
5c09f321 BS	474	setup_path(NULL);
5c09f321 BS	475
3159c8dc	476	if (!enter_repo(dir, 0))
8d630132	477	die("'%s': unable to chdir or not a git archive", dir);
575f4974	478
a0022eeb JH	479	if (is_repository_shallow())
	480	die("attempt to push into a shallow repository");
	481
6fb75bed SP	482	git_config(receive_pack_config);
6fb75bed SP	483
e28714c5 JH	484	if (0 <= transfer_unpack_limit)
	485	unpack_limit = transfer_unpack_limit;
	486	else if (0 <= receive_unpack_limit)
	487	unpack_limit = receive_unpack_limit;
	488
8a65ff76	489	write_head_info();
575f4974 LT	490
575f4974 LT	491	/* EOF */
f3a3214e	492	packet_flush(1);
575f4974 LT	493
575f4974 LT	494	read_head_info();
7f8e9828	495	if (commands) {
d4f694ba JH	496	const char *unpack_status = NULL;
	497
	498	if (!delete_only(commands))
	499	unpack_status = unpack();
8aaf7d64	500	execute_commands(unpack_status);
576162a4 NP	501	if (pack_lockfile)
576162a4 NP	502	unlink(pack_lockfile);
cfee10a7 JH	503	if (report_status)
cfee10a7 JH	504	report(unpack_status);
f43cd49f	505	run_hook(post_receive_hook);
8e663d9e	506	run_update_post_hook(commands);
7f8e9828	507	}
575f4974 LT	508	return 0;
575f4974 LT	509	}