[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 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_opt(RUN_COMMAND_NO_STDIN
		| RUN_COMMAND_STDOUT_TO_STDERR,
		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);
		}
		if (write_ref_sha1(lock, new_sha1, "push")) {
			cmd->error_string = "failed to write";
			return -1; /* error() already called */
		}
		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(argv, RUN_COMMAND_NO_STDIN
		| RUN_COMMAND_STDOUT_TO_STDERR);
}

/*
 * 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)
{
	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 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);

	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();
		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;
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
b1bf95bb JW	70	static char update_hook[] = "hooks/update";
	71
	72	static int run_update_hook(const char *refname,
	73	char old_hex, char new_hex)
	74	{
	75	int code;
	76
	77	if (access(update_hook, X_OK) < 0)
	78	return 0;
95d3c4f5 SP	79	code = run_command_opt(RUN_COMMAND_NO_STDIN
95d3c4f5 SP	80	\| RUN_COMMAND_STDOUT_TO_STDERR,
cd83c74c	81	update_hook, refname, old_hex, new_hex, NULL);
b1bf95bb JW	82	switch (code) {
	83	case 0:
	84	return 0;
	85	case -ERR_RUN_COMMAND_FORK:
cfee10a7	86	return error("hook fork failed");
b1bf95bb	87	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	88	return error("hook execute failed");
b1bf95bb	89	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	90	return error("waitpid failed");
b1bf95bb	91	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	92	return error("waitpid is confused");
b1bf95bb	93	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
bd2afde8	94	return error("%s died of signal", update_hook);
b1bf95bb	95	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	96	return error("%s died strangely", update_hook);
b1bf95bb JW	97	default:
	98	error("%s exited with error code %d", update_hook, -code);
	99	return -code;
	100	}
	101	}
	102
cfee10a7	103	static int update(struct command *cmd)
2eca23da	104	{
cfee10a7 JH	105	const char *name = cmd->ref_name;
	106	unsigned char *old_sha1 = cmd->old_sha1;
	107	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc JH	108	char new_hex[41], old_hex[41];
3159c8dc JH	109	struct ref_lock *lock;
2eca23da	110
cfee10a7 JH	111	cmd->error_string = NULL;
	112	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
	113	cmd->error_string = "funny refname";
d8a1deec JH	114	return error("refusing to create funny ref '%s' locally",
d8a1deec JH	115	name);
cfee10a7	116	}
d8a1deec	117
2eca23da	118	strcpy(new_hex, sha1_to_hex(new_sha1));
3159c8dc	119	strcpy(old_hex, sha1_to_hex(old_sha1));
d4f694ba JH	120
d4f694ba JH	121	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
cfee10a7	122	cmd->error_string = "bad pack";
19614330 JH	123	return error("unpack should have generated %s, "
19614330 JH	124	"but I can't find it!", new_hex);
cfee10a7	125	}
d4f694ba	126	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	127	!is_null_sha1(old_sha1) &&
562cefbd	128	!strncmp(name, "refs/heads/", 11)) {
11031d7e	129	struct commit old_commit, new_commit;
9edd7e46	130	struct commit_list bases, ent;
11031d7e JS	131
	132	old_commit = (struct commit *)parse_object(old_sha1);
	133	new_commit = (struct commit *)parse_object(new_sha1);
9edd7e46 JS	134	bases = get_merge_bases(old_commit, new_commit, 1);
	135	for (ent = bases; ent; ent = ent->next)
	136	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	137	break;
9edd7e46 JS	138	free_commit_list(bases);
9edd7e46 JS	139	if (!ent)
11031d7e	140	return error("denying non-fast forward;"
9edd7e46	141	" you should pull first");
11031d7e	142	}
b1bf95bb	143	if (run_update_hook(name, old_hex, new_hex)) {
cfee10a7	144	cmd->error_string = "hook declined";
bd2afde8	145	return error("hook declined to update %s", name);
b1bf95bb	146	}
3159c8dc	147
d4f694ba JH	148	if (is_null_sha1(new_sha1)) {
	149	if (delete_ref(name, old_sha1)) {
	150	cmd->error_string = "failed to delete";
	151	return error("failed to delete %s", name);
	152	}
	153	fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
	154	}
	155	else {
	156	lock = lock_any_ref_for_update(name, old_sha1);
	157	if (!lock) {
	158	cmd->error_string = "failed to lock";
	159	return error("failed to lock %s", name);
	160	}
ef203f08 SP	161	if (write_ref_sha1(lock, new_sha1, "push")) {
	162	cmd->error_string = "failed to write";
	163	return -1; /* error() already called */
	164	}
d4f694ba	165	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330	166	}
3159c8dc	167	return 0;
2eca23da LT	168	}
2eca23da LT	169
19614330 JH	170	static char update_post_hook[] = "hooks/post-update";
	171
	172	static void run_update_post_hook(struct command *cmd)
	173	{
	174	struct command *cmd_p;
	175	int argc;
9201c707	176	const char **argv;
19614330 JH	177
	178	if (access(update_post_hook, X_OK) < 0)
	179	return;
	180	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	181	if (cmd_p->error_string)
19614330 JH	182	continue;
	183	argc++;
	184	}
	185	argv = xmalloc(sizeof(argv) (1 + argc));
	186	argv[0] = update_post_hook;
	187
	188	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	189	char *p;
cfee10a7	190	if (cmd_p->error_string)
19614330	191	continue;
9201c707 JH	192	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	193	strcpy(p, cmd_p->ref_name);
	194	argv[argc] = p;
19614330 JH	195	argc++;
	196	}
	197	argv[argc] = NULL;
95d3c4f5 SP	198	run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
95d3c4f5 SP	199	\| RUN_COMMAND_STDOUT_TO_STDERR);
19614330	200	}
2eca23da	201
575f4974 LT	202	/*
	203	* This gets called after(if) we've successfully
	204	* unpacked the data payload.
	205	*/
	206	static void execute_commands(void)
	207	{
eb1af2df LT	208	struct command *cmd = commands;
	209
	210	while (cmd) {
cfee10a7	211	update(cmd);
eb1af2df	212	cmd = cmd->next;
575f4974	213	}
19614330	214	run_update_post_hook(commands);
575f4974 LT	215	}
	216
	217	static void read_head_info(void)
	218	{
eb1af2df	219	struct command **p = &commands;
575f4974 LT	220	for (;;) {
575f4974 LT	221	static char line[1000];
eb1af2df LT	222	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	223	struct command *cmd;
cfee10a7 JH	224	char *refname;
cfee10a7 JH	225	int len, reflen;
eb1af2df LT	226
eb1af2df LT	227	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	228	if (!len)
575f4974 LT	229	break;
eb1af2df LT	230	if (line[len-1] == '\n')
	231	line[--len] = 0;
	232	if (len < 83 \|\|
	233	line[40] != ' ' \|\|
	234	line[81] != ' ' \|\|
	235	get_sha1_hex(line, old_sha1) \|\|
	236	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	237	die("protocol error: expected old/new/ref, got '%s'",
	238	line);
	239
	240	refname = line + 82;
	241	reflen = strlen(refname);
	242	if (reflen + 82 < len) {
	243	if (strstr(refname + reflen + 1, "report-status"))
	244	report_status = 1;
	245	}
eb1af2df	246	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	247	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	248	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	249	memcpy(cmd->ref_name, line + 82, len - 81);
cfee10a7	250	cmd->error_string = "n/a (unpacker error)";
eb1af2df LT	251	cmd->next = NULL;
	252	*p = cmd;
	253	p = &cmd->next;
575f4974 LT	254	}
	255	}
	256
fc04c412 SP	257	static const char parse_pack_header(struct pack_header hdr)
fc04c412 SP	258	{
a69e5429 JH	259	switch (read_pack_header(0, hdr)) {
	260	case PH_ERROR_EOF:
	261	return "eof before pack header was fully read";
	262
	263	case PH_ERROR_PACK_SIGNATURE:
fc04c412	264	return "protocol error (pack signature mismatch detected)";
a69e5429 JH	265
a69e5429 JH	266	case PH_ERROR_PROTOCOL:
fc04c412	267	return "protocol error (pack version unsupported)";
a69e5429 JH	268
	269	default:
	270	return "unknown error in parse_pack_header";
	271
	272	case 0:
	273	return NULL;
	274	}
fc04c412 SP	275	}
fc04c412 SP	276
576162a4 NP	277	static const char *pack_lockfile;
576162a4 NP	278
861ed121	279	static const char *unpack(void)
575f4974	280	{
fc04c412 SP	281	struct pack_header hdr;
	282	const char *hdr_err;
	283	char hdr_arg[38];
fc04c412 SP	284
	285	hdr_err = parse_pack_header(&hdr);
	286	if (hdr_err)
	287	return hdr_err;
	288	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	289	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	290
	291	if (ntohl(hdr.hdr_entries) < unpack_limit) {
576162a4	292	int code;
fc04c412 SP	293	const char *unpacker[3];
	294	unpacker[0] = "unpack-objects";
	295	unpacker[1] = hdr_arg;
	296	unpacker[2] = NULL;
9b0b5093	297	code = run_command_v_opt(unpacker, RUN_GIT_CMD);
576162a4	298	switch (code) {
fc04c412 SP	299	case 0:
	300	return NULL;
	301	case -ERR_RUN_COMMAND_FORK:
	302	return "unpack fork failed";
	303	case -ERR_RUN_COMMAND_EXEC:
	304	return "unpack execute failed";
	305	case -ERR_RUN_COMMAND_WAITPID:
	306	return "waitpid failed";
	307	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	308	return "waitpid is confused";
	309	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	310	return "unpacker died of signal";
	311	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	312	return "unpacker died strangely";
	313	default:
	314	return "unpacker exited with error code";
576162a4 NP	315	}
	316	} else {
	317	const char *keeper[6];
	318	int fd[2], s, len, status;
	319	pid_t pid;
	320	char keep_arg[256];
	321	char packname[46];
	322
	323	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	324	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	325	strcpy(keep_arg + s, "localhost");
	326
	327	keeper[0] = "index-pack";
	328	keeper[1] = "--stdin";
	329	keeper[2] = "--fix-thin";
	330	keeper[3] = hdr_arg;
	331	keeper[4] = keep_arg;
	332	keeper[5] = NULL;
	333
	334	if (pipe(fd) < 0)
	335	return "index-pack pipe failed";
	336	pid = fork();
	337	if (pid < 0)
	338	return "index-pack fork failed";
	339	if (!pid) {
	340	dup2(fd[1], 1);
	341	close(fd[1]);
	342	close(fd[0]);
	343	execv_git_cmd(keeper);
	344	die("execv of index-pack failed");
	345	}
	346	close(fd[1]);
	347
	348	/*
	349	* The first thing we expects from index-pack's output
	350	* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
	351	* %40s is the newly created pack SHA1 name. In the "keep"
	352	* case, we need it to remove the corresponding .keep file
	353	* later on. If we don't get that then tough luck with it.
	354	*/
	355	for (len = 0;
	356	len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
	357	len += s);
	358	close(fd[0]);
	359	if (len == 46 && packname[45] == '\n' &&
	360	memcmp(packname, "keep\t", 5) == 0) {
	361	char path[PATH_MAX];
	362	packname[45] = 0;
	363	snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
	364	get_object_directory(), packname + 5);
	365	pack_lockfile = xstrdup(path);
	366	}
	367
	368	/* Then wrap our index-pack process. */
	369	while (waitpid(pid, &status, 0) < 0)
	370	if (errno != EINTR)
	371	return "waitpid failed";
	372	if (WIFEXITED(status)) {
	373	int code = WEXITSTATUS(status);
	374	if (code)
	375	return "index-pack exited with error code";
	376	reprepare_packed_git();
	377	return NULL;
	378	}
379	return "index-pack abnormal exit";
cfee10a7 JH	380	}
	381	}
	382
	383	static void report(const char *unpack_status)
	384	{
	385	struct command *cmd;
	386	packet_write(1, "unpack %s\n",
	387	unpack_status ? unpack_status : "ok");
	388	for (cmd = commands; cmd; cmd = cmd->next) {
	389	if (!cmd->error_string)
	390	packet_write(1, "ok %s\n",
	391	cmd->ref_name);
	392	else
	393	packet_write(1, "ng %s %s\n",
	394	cmd->ref_name, cmd->error_string);
575f4974	395	}
cfee10a7	396	packet_flush(1);
575f4974 LT	397	}
575f4974 LT	398
d4f694ba JH	399	static int delete_only(struct command *cmd)
	400	{
	401	while (cmd) {
	402	if (!is_null_sha1(cmd->new_sha1))
	403	return 0;
	404	cmd = cmd->next;
	405	}
	406	return 1;
	407	}
	408
575f4974 LT	409	int main(int argc, char **argv)
575f4974 LT	410	{
d0efc8a7	411	int i;
8d630132	412	char *dir = NULL;
575f4974 LT	413
	414	argv++;
	415	for (i = 1; i < argc; i++) {
8d630132	416	char arg = argv++;
575f4974 LT	417
575f4974 LT	418	if (*arg == '-') {
575f4974 LT	419	/* Do flag handling here */
	420	usage(receive_pack_usage);
	421	}
d0efc8a7 LT	422	if (dir)
d0efc8a7 LT	423	usage(receive_pack_usage);
575f4974	424	dir = arg;
575f4974 LT	425	}
	426	if (!dir)
	427	usage(receive_pack_usage);
	428
3159c8dc	429	if (!enter_repo(dir, 0))
8d630132	430	die("'%s': unable to chdir or not a git archive", dir);
575f4974	431
a0022eeb JH	432	if (is_repository_shallow())
	433	die("attempt to push into a shallow repository");
	434
6fb75bed SP	435	git_config(receive_pack_config);
6fb75bed SP	436
e28714c5 JH	437	if (0 <= transfer_unpack_limit)
	438	unpack_limit = transfer_unpack_limit;
	439	else if (0 <= receive_unpack_limit)
	440	unpack_limit = receive_unpack_limit;
	441
8a65ff76	442	write_head_info();
575f4974 LT	443
575f4974 LT	444	/* EOF */
f3a3214e	445	packet_flush(1);
575f4974 LT	446
575f4974 LT	447	read_head_info();
7f8e9828	448	if (commands) {
d4f694ba JH	449	const char *unpack_status = NULL;
	450
	451	if (!delete_only(commands))
	452	unpack_status = unpack();
cfee10a7 JH	453	if (!unpack_status)
cfee10a7 JH	454	execute_commands();
576162a4 NP	455	if (pack_lockfile)
576162a4 NP	456	unlink(pack_lockfile);
cfee10a7 JH	457	if (report_status)
cfee10a7 JH	458	report(unpack_status);
7f8e9828	459	}
575f4974 LT	460	return 0;
575f4974 LT	461	}