[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 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)
{
	git_default_config(var, value);

	if (strcmp(var, "receive.denynonfastforwards") == 0)
	{
		deny_non_fast_forwards = git_config_bool(var, value);
		return 0;
	}

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

	return 0;
}

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 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[41], old_hex[41];
	struct ref_lock *lock;

	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);
	}

	strcpy(new_hex, sha1_to_hex(new_sha1));
	strcpy(old_hex, sha1_to_hex(old_sha1));

	if (!is_null_sha1(new_sha1) && !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);
	}
	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !strncmp(name, "refs/heads/", 11)) {
		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)
			return error("denying non-fast forward;"
				     " you should pull first");
	}
	if (run_update_hook(name, old_hex, new_hex)) {
		cmd->error_string = "hook declined";
		return error("hook declined to update %s", name);
	}

	if (is_null_sha1(new_sha1)) {
		if (delete_ref(name, old_sha1)) {
			cmd->error_string = "failed to delete";
			return error("failed to delete %s", name);
		}
		fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
	}
	else {
		lock = lock_any_ref_for_update(name, old_sha1);
		if (!lock) {
			cmd->error_string = "failed to lock";
			return error("failed to lock %s", name);
		}
		write_ref_sha1(lock, new_sha1, "push");
		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 *parse_pack_header(struct pack_header *hdr)
{
	char *c = (char*)hdr;
	ssize_t remaining = sizeof(struct pack_header);
	do {
		ssize_t r = xread(0, c, remaining);
		if (r <= 0)
			return "eof before pack header was fully read";
		remaining -= r;
		c += r;
	} while (remaining > 0);
	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
		return "protocol error (pack signature mismatch detected)";
	if (!pack_version_ok(hdr->hdr_version))
		return "protocol error (pack version unsupported)";
	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(1, 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 fd[2], s, len, status;
		pid_t pid;
		char keep_arg[256];
		char packname[46];

		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;

		if (pipe(fd) < 0)
			return "index-pack pipe failed";
		pid = fork();
		if (pid < 0)
			return "index-pack fork failed";
		if (!pid) {
			dup2(fd[1], 1);
			close(fd[1]);
			close(fd[0]);
			execv_git_cmd(keeper);
			die("execv of index-pack failed");
		}
		close(fd[1]);

		/*
		 * The first thing we expects from index-pack's output
		 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
		 * %40s is the newly created pack SHA1 name.  In the "keep"
		 * case, we need it to remove the corresponding .keep file
		 * later on.  If we don't get that then tough luck with it.
		 */
		for (len = 0;
		     len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
		     len += s);
		close(fd[0]);
		if (len == 46 && packname[45] == '\n' &&
		    memcmp(packname, "keep\t", 5) == 0) {
			char path[PATH_MAX];
			packname[45] = 0;
			snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
				 get_object_directory(), packname + 5);
			pack_lockfile = xstrdup(path);
		}

		/* Then wrap our index-pack process. */
		while (waitpid(pid, &status, 0) < 0)
			if (errno != EINTR)
				return "waitpid failed";
		if (WIFEXITED(status)) {
			int code = WEXITSTATUS(status);
			if (code)
				return "index-pack exited with error code";
			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);

	setup_ident();
	/* don't die if gecos is empty */
	ignore_missing_committer_name();
	git_config(receive_pack_config);

	write_head_info();

	/* EOF */
	packet_flush(1);

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

		if (!delete_only(commands))
			unpack_status = unpack();
		if (!unpack_status)
			execute_commands();
		if (pack_lockfile)
			unlink(pack_lockfile);
		if (report_status)
			report(unpack_status);
	}
	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;
46732fae	13	static int unpack_limit = 100;
96f1e58f	14	static int report_status;
cfee10a7	15
d4f694ba	16	static char capabilities[] = " report-status delete-refs ";
96f1e58f	17	static int capabilities_sent;
cfee10a7	18
6fb75bed SP	19	static int receive_pack_config(const char var, const char value)
	20	{
	21	git_default_config(var, value);
	22
	23	if (strcmp(var, "receive.denynonfastforwards") == 0)
	24	{
	25	deny_non_fast_forwards = git_config_bool(var, value);
	26	return 0;
	27	}
	28
fc04c412 SP	29	if (strcmp(var, "receive.unpacklimit") == 0)
	30	{
	31	unpack_limit = git_config_int(var, value);
	32	return 0;
	33	}
	34
6fb75bed SP	35	return 0;
	36	}
	37
8da19775	38	static int show_ref(const char path, const unsigned char sha1, int flag, void *cb_data)
575f4974	39	{
cfee10a7 JH	40	if (capabilities_sent)
	41	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	42	else
	43	packet_write(1, "%s %s%c%s\n",
	44	sha1_to_hex(sha1), path, 0, capabilities);
	45	capabilities_sent = 1;
8a65ff76	46	return 0;
575f4974 LT	47	}
575f4974 LT	48
8a65ff76	49	static void write_head_info(void)
575f4974	50	{
cb5d709f	51	for_each_ref(show_ref, NULL);
cfee10a7	52	if (!capabilities_sent)
8da19775	53	show_ref("capabilities^{}", null_sha1, 0, NULL);
cfee10a7	54
575f4974 LT	55	}
575f4974 LT	56
eb1af2df LT	57	struct command {
eb1af2df LT	58	struct command *next;
cfee10a7	59	const char *error_string;
eb1af2df LT	60	unsigned char old_sha1[20];
eb1af2df LT	61	unsigned char new_sha1[20];
8f1d2e6f	62	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	63	};
575f4974 LT	64
96f1e58f	65	static struct command *commands;
575f4974	66
b1bf95bb JW	67	static char update_hook[] = "hooks/update";
	68
	69	static int run_update_hook(const char *refname,
	70	char old_hex, char new_hex)
	71	{
	72	int code;
	73
	74	if (access(update_hook, X_OK) < 0)
	75	return 0;
	76	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	77	switch (code) {
	78	case 0:
	79	return 0;
	80	case -ERR_RUN_COMMAND_FORK:
cfee10a7	81	return error("hook fork failed");
b1bf95bb	82	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	83	return error("hook execute failed");
b1bf95bb	84	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	85	return error("waitpid failed");
b1bf95bb	86	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	87	return error("waitpid is confused");
b1bf95bb	88	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
bd2afde8	89	return error("%s died of signal", update_hook);
b1bf95bb	90	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	91	return error("%s died strangely", update_hook);
b1bf95bb JW	92	default:
	93	error("%s exited with error code %d", update_hook, -code);
	94	return -code;
	95	}
	96	}
	97
cfee10a7	98	static int update(struct command *cmd)
2eca23da	99	{
cfee10a7 JH	100	const char *name = cmd->ref_name;
	101	unsigned char *old_sha1 = cmd->old_sha1;
	102	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc JH	103	char new_hex[41], old_hex[41];
3159c8dc JH	104	struct ref_lock *lock;
2eca23da	105
cfee10a7 JH	106	cmd->error_string = NULL;
	107	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
	108	cmd->error_string = "funny refname";
d8a1deec JH	109	return error("refusing to create funny ref '%s' locally",
d8a1deec JH	110	name);
cfee10a7	111	}
d8a1deec	112
2eca23da	113	strcpy(new_hex, sha1_to_hex(new_sha1));
3159c8dc	114	strcpy(old_hex, sha1_to_hex(old_sha1));
d4f694ba JH	115
d4f694ba JH	116	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
cfee10a7	117	cmd->error_string = "bad pack";
19614330 JH	118	return error("unpack should have generated %s, "
19614330 JH	119	"but I can't find it!", new_hex);
cfee10a7	120	}
d4f694ba	121	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	122	!is_null_sha1(old_sha1) &&
562cefbd	123	!strncmp(name, "refs/heads/", 11)) {
11031d7e	124	struct commit old_commit, new_commit;
9edd7e46	125	struct commit_list bases, ent;
11031d7e JS	126
	127	old_commit = (struct commit *)parse_object(old_sha1);
	128	new_commit = (struct commit *)parse_object(new_sha1);
9edd7e46 JS	129	bases = get_merge_bases(old_commit, new_commit, 1);
	130	for (ent = bases; ent; ent = ent->next)
	131	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	132	break;
9edd7e46 JS	133	free_commit_list(bases);
9edd7e46 JS	134	if (!ent)
11031d7e	135	return error("denying non-fast forward;"
9edd7e46	136	" you should pull first");
11031d7e	137	}
b1bf95bb	138	if (run_update_hook(name, old_hex, new_hex)) {
cfee10a7	139	cmd->error_string = "hook declined";
bd2afde8	140	return error("hook declined to update %s", name);
b1bf95bb	141	}
3159c8dc	142
d4f694ba JH	143	if (is_null_sha1(new_sha1)) {
	144	if (delete_ref(name, old_sha1)) {
	145	cmd->error_string = "failed to delete";
	146	return error("failed to delete %s", name);
	147	}
	148	fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
	149	}
	150	else {
	151	lock = lock_any_ref_for_update(name, old_sha1);
	152	if (!lock) {
	153	cmd->error_string = "failed to lock";
	154	return error("failed to lock %s", name);
	155	}
	156	write_ref_sha1(lock, new_sha1, "push");
	157	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330	158	}
3159c8dc	159	return 0;
2eca23da LT	160	}
2eca23da LT	161
19614330 JH	162	static char update_post_hook[] = "hooks/post-update";
	163
	164	static void run_update_post_hook(struct command *cmd)
	165	{
	166	struct command *cmd_p;
	167	int argc;
9201c707	168	const char **argv;
19614330 JH	169
	170	if (access(update_post_hook, X_OK) < 0)
	171	return;
	172	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	173	if (cmd_p->error_string)
19614330 JH	174	continue;
	175	argc++;
	176	}
	177	argv = xmalloc(sizeof(argv) (1 + argc));
	178	argv[0] = update_post_hook;
	179
	180	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	181	char *p;
cfee10a7	182	if (cmd_p->error_string)
19614330	183	continue;
9201c707 JH	184	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	185	strcpy(p, cmd_p->ref_name);
	186	argv[argc] = p;
19614330 JH	187	argc++;
	188	}
	189	argv[argc] = NULL;
128aed68	190	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
19614330	191	}
2eca23da	192
575f4974 LT	193	/*
	194	* This gets called after(if) we've successfully
	195	* unpacked the data payload.
	196	*/
	197	static void execute_commands(void)
	198	{
eb1af2df LT	199	struct command *cmd = commands;
	200
	201	while (cmd) {
cfee10a7	202	update(cmd);
eb1af2df	203	cmd = cmd->next;
575f4974	204	}
19614330	205	run_update_post_hook(commands);
575f4974 LT	206	}
	207
	208	static void read_head_info(void)
	209	{
eb1af2df	210	struct command **p = &commands;
575f4974 LT	211	for (;;) {
575f4974 LT	212	static char line[1000];
eb1af2df LT	213	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	214	struct command *cmd;
cfee10a7 JH	215	char *refname;
cfee10a7 JH	216	int len, reflen;
eb1af2df LT	217
eb1af2df LT	218	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	219	if (!len)
575f4974 LT	220	break;
eb1af2df LT	221	if (line[len-1] == '\n')
	222	line[--len] = 0;
	223	if (len < 83 \|\|
	224	line[40] != ' ' \|\|
	225	line[81] != ' ' \|\|
	226	get_sha1_hex(line, old_sha1) \|\|
	227	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	228	die("protocol error: expected old/new/ref, got '%s'",
	229	line);
	230
	231	refname = line + 82;
	232	reflen = strlen(refname);
	233	if (reflen + 82 < len) {
	234	if (strstr(refname + reflen + 1, "report-status"))
	235	report_status = 1;
	236	}
eb1af2df	237	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	238	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	239	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	240	memcpy(cmd->ref_name, line + 82, len - 81);
cfee10a7	241	cmd->error_string = "n/a (unpacker error)";
eb1af2df LT	242	cmd->next = NULL;
	243	*p = cmd;
	244	p = &cmd->next;
575f4974 LT	245	}
	246	}
	247
fc04c412 SP	248	static const char parse_pack_header(struct pack_header hdr)
	249	{
	250	char c = (char)hdr;
	251	ssize_t remaining = sizeof(struct pack_header);
	252	do {
	253	ssize_t r = xread(0, c, remaining);
	254	if (r <= 0)
	255	return "eof before pack header was fully read";
	256	remaining -= r;
	257	c += r;
	258	} while (remaining > 0);
	259	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
	260	return "protocol error (pack signature mismatch detected)";
	261	if (!pack_version_ok(hdr->hdr_version))
	262	return "protocol error (pack version unsupported)";
	263	return NULL;
	264	}
	265
576162a4 NP	266	static const char *pack_lockfile;
576162a4 NP	267
861ed121	268	static const char *unpack(void)
575f4974	269	{
fc04c412 SP	270	struct pack_header hdr;
	271	const char *hdr_err;
	272	char hdr_arg[38];
fc04c412 SP	273
	274	hdr_err = parse_pack_header(&hdr);
	275	if (hdr_err)
	276	return hdr_err;
	277	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	278	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	279
	280	if (ntohl(hdr.hdr_entries) < unpack_limit) {
576162a4	281	int code;
fc04c412 SP	282	const char *unpacker[3];
	283	unpacker[0] = "unpack-objects";
	284	unpacker[1] = hdr_arg;
	285	unpacker[2] = NULL;
	286	code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
576162a4	287	switch (code) {
fc04c412 SP	288	case 0:
	289	return NULL;
	290	case -ERR_RUN_COMMAND_FORK:
	291	return "unpack fork failed";
	292	case -ERR_RUN_COMMAND_EXEC:
	293	return "unpack execute failed";
	294	case -ERR_RUN_COMMAND_WAITPID:
	295	return "waitpid failed";
	296	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	297	return "waitpid is confused";
	298	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	299	return "unpacker died of signal";
	300	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	301	return "unpacker died strangely";
	302	default:
	303	return "unpacker exited with error code";
576162a4 NP	304	}
	305	} else {
	306	const char *keeper[6];
	307	int fd[2], s, len, status;
	308	pid_t pid;
	309	char keep_arg[256];
	310	char packname[46];
	311
	312	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	313	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	314	strcpy(keep_arg + s, "localhost");
	315
	316	keeper[0] = "index-pack";
	317	keeper[1] = "--stdin";
	318	keeper[2] = "--fix-thin";
	319	keeper[3] = hdr_arg;
	320	keeper[4] = keep_arg;
	321	keeper[5] = NULL;
	322
	323	if (pipe(fd) < 0)
	324	return "index-pack pipe failed";
	325	pid = fork();
	326	if (pid < 0)
	327	return "index-pack fork failed";
	328	if (!pid) {
	329	dup2(fd[1], 1);
	330	close(fd[1]);
	331	close(fd[0]);
	332	execv_git_cmd(keeper);
	333	die("execv of index-pack failed");
	334	}
	335	close(fd[1]);
	336
	337	/*
	338	* The first thing we expects from index-pack's output
	339	* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
	340	* %40s is the newly created pack SHA1 name. In the "keep"
	341	* case, we need it to remove the corresponding .keep file
	342	* later on. If we don't get that then tough luck with it.
	343	*/
	344	for (len = 0;
	345	len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
	346	len += s);
	347	close(fd[0]);
	348	if (len == 46 && packname[45] == '\n' &&
	349	memcmp(packname, "keep\t", 5) == 0) {
	350	char path[PATH_MAX];
	351	packname[45] = 0;
	352	snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
	353	get_object_directory(), packname + 5);
	354	pack_lockfile = xstrdup(path);
	355	}
	356
	357	/* Then wrap our index-pack process. */
	358	while (waitpid(pid, &status, 0) < 0)
	359	if (errno != EINTR)
	360	return "waitpid failed";
	361	if (WIFEXITED(status)) {
	362	int code = WEXITSTATUS(status);
	363	if (code)
	364	return "index-pack exited with error code";
	365	reprepare_packed_git();
	366	return NULL;
	367	}
368	return "index-pack abnormal exit";
cfee10a7 JH	369	}
	370	}
	371
	372	static void report(const char *unpack_status)
	373	{
	374	struct command *cmd;
	375	packet_write(1, "unpack %s\n",
	376	unpack_status ? unpack_status : "ok");
	377	for (cmd = commands; cmd; cmd = cmd->next) {
	378	if (!cmd->error_string)
	379	packet_write(1, "ok %s\n",
	380	cmd->ref_name);
	381	else
	382	packet_write(1, "ng %s %s\n",
	383	cmd->ref_name, cmd->error_string);
575f4974	384	}
cfee10a7	385	packet_flush(1);
575f4974 LT	386	}
575f4974 LT	387
d4f694ba JH	388	static int delete_only(struct command *cmd)
	389	{
	390	while (cmd) {
	391	if (!is_null_sha1(cmd->new_sha1))
	392	return 0;
	393	cmd = cmd->next;
	394	}
	395	return 1;
	396	}
	397
575f4974 LT	398	int main(int argc, char **argv)
575f4974 LT	399	{
d0efc8a7	400	int i;
8d630132	401	char *dir = NULL;
575f4974 LT	402
	403	argv++;
	404	for (i = 1; i < argc; i++) {
8d630132	405	char arg = argv++;
575f4974 LT	406
575f4974 LT	407	if (*arg == '-') {
575f4974 LT	408	/* Do flag handling here */
	409	usage(receive_pack_usage);
	410	}
d0efc8a7 LT	411	if (dir)
d0efc8a7 LT	412	usage(receive_pack_usage);
575f4974	413	dir = arg;
575f4974 LT	414	}
	415	if (!dir)
	416	usage(receive_pack_usage);
	417
3159c8dc	418	if (!enter_repo(dir, 0))
8d630132	419	die("'%s': unable to chdir or not a git archive", dir);
575f4974	420
94d8213f	421	setup_ident();
a7f196a7 SP	422	/* don't die if gecos is empty */
a7f196a7 SP	423	ignore_missing_committer_name();
6fb75bed SP	424	git_config(receive_pack_config);
6fb75bed SP	425
8a65ff76	426	write_head_info();
575f4974 LT	427
575f4974 LT	428	/* EOF */
f3a3214e	429	packet_flush(1);
575f4974 LT	430
575f4974 LT	431	read_head_info();
7f8e9828	432	if (commands) {
d4f694ba JH	433	const char *unpack_status = NULL;
	434
	435	if (!delete_only(commands))
	436	unpack_status = unpack();
cfee10a7 JH	437	if (!unpack_status)
cfee10a7 JH	438	execute_commands();
576162a4 NP	439	if (pack_lockfile)
576162a4 NP	440	unlink(pack_lockfile);
cfee10a7 JH	441	if (report_status)
cfee10a7 JH	442	report(unpack_status);
7f8e9828	443	}
575f4974 LT	444	return 0;
575f4974 LT	445	}