[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 update_hook[] = "hooks/update";
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_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,
	struct command *first_cmd,
	int single)
{
	struct command *cmd;
	int argc, code;
	const char **argv;

	for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
		if (!cmd->error_string)
			argc += 3;
		if (single)
			break;
	}

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

	argv = xmalloc(sizeof(*argv) * (2 + argc));
	argv[0] = hook_name;
	for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
		if (!cmd->error_string) {
			argv[argc++] = xstrdup(cmd->ref_name);
			argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
			argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
		}
		if (single)
			break;
	}
	argv[argc] = NULL;

	code = run_command_v_opt(argv,
		RUN_COMMAND_NO_STDIN | RUN_COMMAND_STDOUT_TO_STDERR);
	while (--argc > 0)
		free((char*)argv[argc]);
	free(argv);

	return hook_status(code, hook_name);
}

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' locally", 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_hook(update_hook, cmd, 1)) {
		error("hook declined to update %s", name);
		return "hook declined";
	}

	if (is_null_sha1(new_sha1)) {
		if (delete_ref(name, old_sha1)) {
			error("failed to delete %s", name);
			return "failed to delete";
		}
		fprintf(stderr, "%s: %s -> deleted\n", name,
			sha1_to_hex(old_sha1));
		return NULL; /* good */
	}
	else {
		lock = lock_any_ref_for_update(name, old_sha1);
		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 */
		}
		fprintf(stderr, "%s: %s -> %s\n", name,
			sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
		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, commands, 0)) {
		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 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();
		execute_commands(unpack_status);
		if (pack_lockfile)
			unlink(pack_lockfile);
		if (report_status)
			report(unpack_status);
		run_hook(post_receive_hook, commands, 0);
		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
c8dd2771	70	static const char update_hook[] = "hooks/update";
05ef58ec SP	71	static const char pre_receive_hook[] = "hooks/pre-receive";
05ef58ec SP	72	static const char post_receive_hook[] = "hooks/post-receive";
b1bf95bb	73
6c319a22 SP	74	static int hook_status(int code, const char *hook_name)
	75	{
	76	switch (code) {
	77	case 0:
	78	return 0;
	79	case -ERR_RUN_COMMAND_FORK:
	80	return error("hook fork failed");
	81	case -ERR_RUN_COMMAND_EXEC:
	82	return error("hook execute failed");
	83	case -ERR_RUN_COMMAND_WAITPID:
	84	return error("waitpid failed");
	85	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	86	return error("waitpid is confused");
	87	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	88	return error("%s died of signal", hook_name);
	89	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	90	return error("%s died strangely", hook_name);
	91	default:
	92	error("%s exited with error code %d", hook_name, -code);
	93	return -code;
	94	}
	95	}
	96
c8dd2771 SP	97	static int run_hook(const char *hook_name,
	98	struct command *first_cmd,
	99	int single)
b1bf95bb	100	{
c8dd2771 SP	101	struct command *cmd;
	102	int argc, code;
	103	const char **argv;
	104
	105	for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
	106	if (!cmd->error_string)
	107	argc += 3;
	108	if (single)
	109	break;
	110	}
b1bf95bb	111
c8dd2771	112	if (!argc \|\| access(hook_name, X_OK) < 0)
b1bf95bb	113	return 0;
c8dd2771 SP	114
	115	argv = xmalloc(sizeof(argv) (2 + argc));
	116	argv[0] = hook_name;
	117	for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
	118	if (!cmd->error_string) {
	119	argv[argc++] = xstrdup(cmd->ref_name);
	120	argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
	121	argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
	122	}
	123	if (single)
	124	break;
	125	}
	126	argv[argc] = NULL;
	127
	128	code = run_command_v_opt(argv,
	129	RUN_COMMAND_NO_STDIN \| RUN_COMMAND_STDOUT_TO_STDERR);
	130	while (--argc > 0)
	131	free((char*)argv[argc]);
	132	free(argv);
	133
6c319a22	134	return hook_status(code, hook_name);
b1bf95bb JW	135	}
b1bf95bb JW	136
8aaf7d64	137	static const char update(struct command cmd)
2eca23da	138	{
cfee10a7 JH	139	const char *name = cmd->ref_name;
	140	unsigned char *old_sha1 = cmd->old_sha1;
	141	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc	142	struct ref_lock *lock;
2eca23da	143
cc44c765	144	if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
8aaf7d64 SP	145	error("refusing to create funny ref '%s' locally", name);
8aaf7d64 SP	146	return "funny refname";
cfee10a7	147	}
d8a1deec	148
d4f694ba	149	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
8aaf7d64 SP	150	error("unpack should have generated %s, "
	151	"but I can't find it!", sha1_to_hex(new_sha1));
	152	return "bad pack";
cfee10a7	153	}
d4f694ba	154	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	155	!is_null_sha1(old_sha1) &&
cc44c765	156	!prefixcmp(name, "refs/heads/")) {
11031d7e	157	struct commit old_commit, new_commit;
9edd7e46	158	struct commit_list bases, ent;
11031d7e JS	159
	160	old_commit = (struct commit *)parse_object(old_sha1);
	161	new_commit = (struct commit *)parse_object(new_sha1);
9edd7e46 JS	162	bases = get_merge_bases(old_commit, new_commit, 1);
	163	for (ent = bases; ent; ent = ent->next)
	164	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	165	break;
9edd7e46	166	free_commit_list(bases);
8aaf7d64 SP	167	if (!ent) {
	168	error("denying non-fast forward %s"
	169	" (you should pull first)", name);
	170	return "non-fast forward";
	171	}
11031d7e	172	}
c8dd2771	173	if (run_hook(update_hook, cmd, 1)) {
8aaf7d64 SP	174	error("hook declined to update %s", name);
8aaf7d64 SP	175	return "hook declined";
b1bf95bb	176	}
3159c8dc	177
d4f694ba JH	178	if (is_null_sha1(new_sha1)) {
d4f694ba JH	179	if (delete_ref(name, old_sha1)) {
8aaf7d64 SP	180	error("failed to delete %s", name);
8aaf7d64 SP	181	return "failed to delete";
d4f694ba	182	}
c8dd2771 SP	183	fprintf(stderr, "%s: %s -> deleted\n", name,
c8dd2771 SP	184	sha1_to_hex(old_sha1));
8aaf7d64	185	return NULL; /* good */
d4f694ba JH	186	}
	187	else {
	188	lock = lock_any_ref_for_update(name, old_sha1);
	189	if (!lock) {
8aaf7d64 SP	190	error("failed to lock %s", name);
8aaf7d64 SP	191	return "failed to lock";
d4f694ba	192	}
ef203f08	193	if (write_ref_sha1(lock, new_sha1, "push")) {
8aaf7d64	194	return "failed to write"; /* error() already called */
ef203f08	195	}
c8dd2771 SP	196	fprintf(stderr, "%s: %s -> %s\n", name,
c8dd2771 SP	197	sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
8aaf7d64	198	return NULL; /* good */
19614330	199	}
2eca23da LT	200	}
2eca23da LT	201
19614330 JH	202	static char update_post_hook[] = "hooks/post-update";
	203
	204	static void run_update_post_hook(struct command *cmd)
	205	{
	206	struct command *cmd_p;
	207	int argc;
9201c707	208	const char **argv;
19614330	209
3e6e152c	210	for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	211	if (cmd_p->error_string)
19614330 JH	212	continue;
	213	argc++;
	214	}
3e6e152c SP	215	if (!argc \|\| access(update_post_hook, X_OK) < 0)
	216	return;
	217	argv = xmalloc(sizeof(argv) (2 + argc));
19614330 JH	218	argv[0] = update_post_hook;
	219
	220	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	221	char *p;
cfee10a7	222	if (cmd_p->error_string)
19614330	223	continue;
9201c707 JH	224	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	225	strcpy(p, cmd_p->ref_name);
	226	argv[argc] = p;
19614330 JH	227	argc++;
	228	}
	229	argv[argc] = NULL;
95d3c4f5 SP	230	run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
95d3c4f5 SP	231	\| RUN_COMMAND_STDOUT_TO_STDERR);
19614330	232	}
2eca23da	233
8aaf7d64	234	static void execute_commands(const char *unpacker_error)
575f4974	235	{
eb1af2df	236	struct command *cmd = commands;
8aaf7d64 SP	237
	238	if (unpacker_error) {
	239	while (cmd) {
	240	cmd->error_string = "n/a (unpacker error)";
	241	cmd = cmd->next;
	242	}
	243	return;
	244	}
	245
05ef58ec SP	246	if (run_hook(pre_receive_hook, commands, 0)) {
	247	while (cmd) {
	248	cmd->error_string = "pre-receive hook declined";
	249	cmd = cmd->next;
	250	}
	251	return;
	252	}
	253
eb1af2df	254	while (cmd) {
8aaf7d64	255	cmd->error_string = update(cmd);
eb1af2df	256	cmd = cmd->next;
575f4974 LT	257	}
	258	}
	259
	260	static void read_head_info(void)
	261	{
eb1af2df	262	struct command **p = &commands;
575f4974 LT	263	for (;;) {
575f4974 LT	264	static char line[1000];
eb1af2df LT	265	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	266	struct command *cmd;
cfee10a7 JH	267	char *refname;
cfee10a7 JH	268	int len, reflen;
eb1af2df LT	269
eb1af2df LT	270	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	271	if (!len)
575f4974 LT	272	break;
eb1af2df LT	273	if (line[len-1] == '\n')
	274	line[--len] = 0;
	275	if (len < 83 \|\|
	276	line[40] != ' ' \|\|
	277	line[81] != ' ' \|\|
	278	get_sha1_hex(line, old_sha1) \|\|
	279	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	280	die("protocol error: expected old/new/ref, got '%s'",
	281	line);
	282
	283	refname = line + 82;
	284	reflen = strlen(refname);
	285	if (reflen + 82 < len) {
	286	if (strstr(refname + reflen + 1, "report-status"))
	287	report_status = 1;
	288	}
eb1af2df	289	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	290	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	291	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	292	memcpy(cmd->ref_name, line + 82, len - 81);
8aaf7d64	293	cmd->error_string = NULL;
eb1af2df LT	294	cmd->next = NULL;
	295	*p = cmd;
	296	p = &cmd->next;
575f4974 LT	297	}
	298	}
	299
fc04c412 SP	300	static const char parse_pack_header(struct pack_header hdr)
fc04c412 SP	301	{
a69e5429 JH	302	switch (read_pack_header(0, hdr)) {
	303	case PH_ERROR_EOF:
	304	return "eof before pack header was fully read";
	305
	306	case PH_ERROR_PACK_SIGNATURE:
fc04c412	307	return "protocol error (pack signature mismatch detected)";
a69e5429 JH	308
a69e5429 JH	309	case PH_ERROR_PROTOCOL:
fc04c412	310	return "protocol error (pack version unsupported)";
a69e5429 JH	311
	312	default:
	313	return "unknown error in parse_pack_header";
	314
	315	case 0:
	316	return NULL;
	317	}
fc04c412 SP	318	}
fc04c412 SP	319
576162a4 NP	320	static const char *pack_lockfile;
576162a4 NP	321
861ed121	322	static const char *unpack(void)
575f4974	323	{
fc04c412 SP	324	struct pack_header hdr;
	325	const char *hdr_err;
	326	char hdr_arg[38];
fc04c412 SP	327
	328	hdr_err = parse_pack_header(&hdr);
	329	if (hdr_err)
	330	return hdr_err;
	331	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	332	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	333
	334	if (ntohl(hdr.hdr_entries) < unpack_limit) {
576162a4	335	int code;
fc04c412 SP	336	const char *unpacker[3];
	337	unpacker[0] = "unpack-objects";
	338	unpacker[1] = hdr_arg;
	339	unpacker[2] = NULL;
9b0b5093	340	code = run_command_v_opt(unpacker, RUN_GIT_CMD);
576162a4	341	switch (code) {
fc04c412 SP	342	case 0:
	343	return NULL;
	344	case -ERR_RUN_COMMAND_FORK:
	345	return "unpack fork failed";
	346	case -ERR_RUN_COMMAND_EXEC:
	347	return "unpack execute failed";
	348	case -ERR_RUN_COMMAND_WAITPID:
	349	return "waitpid failed";
	350	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	351	return "waitpid is confused";
	352	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	353	return "unpacker died of signal";
	354	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	355	return "unpacker died strangely";
	356	default:
	357	return "unpacker exited with error code";
576162a4 NP	358	}
	359	} else {
	360	const char *keeper[6];
	361	int fd[2], s, len, status;
	362	pid_t pid;
	363	char keep_arg[256];
	364	char packname[46];
	365
	366	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	367	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	368	strcpy(keep_arg + s, "localhost");
	369
	370	keeper[0] = "index-pack";
	371	keeper[1] = "--stdin";
	372	keeper[2] = "--fix-thin";
	373	keeper[3] = hdr_arg;
	374	keeper[4] = keep_arg;
	375	keeper[5] = NULL;
	376
	377	if (pipe(fd) < 0)
	378	return "index-pack pipe failed";
	379	pid = fork();
	380	if (pid < 0)
	381	return "index-pack fork failed";
	382	if (!pid) {
	383	dup2(fd[1], 1);
	384	close(fd[1]);
	385	close(fd[0]);
	386	execv_git_cmd(keeper);
	387	die("execv of index-pack failed");
	388	}
	389	close(fd[1]);
	390
	391	/*
	392	* The first thing we expects from index-pack's output
	393	* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
	394	* %40s is the newly created pack SHA1 name. In the "keep"
	395	* case, we need it to remove the corresponding .keep file
	396	* later on. If we don't get that then tough luck with it.
	397	*/
	398	for (len = 0;
	399	len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
	400	len += s);
	401	close(fd[0]);
	402	if (len == 46 && packname[45] == '\n' &&
	403	memcmp(packname, "keep\t", 5) == 0) {
	404	char path[PATH_MAX];
	405	packname[45] = 0;
	406	snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
	407	get_object_directory(), packname + 5);
	408	pack_lockfile = xstrdup(path);
	409	}
	410
	411	/* Then wrap our index-pack process. */
	412	while (waitpid(pid, &status, 0) < 0)
	413	if (errno != EINTR)
	414	return "waitpid failed";
	415	if (WIFEXITED(status)) {
	416	int code = WEXITSTATUS(status);
	417	if (code)
	418	return "index-pack exited with error code";
	419	reprepare_packed_git();
	420	return NULL;
	421	}
422	return "index-pack abnormal exit";
cfee10a7 JH	423	}
	424	}
	425
	426	static void report(const char *unpack_status)
	427	{
	428	struct command *cmd;
	429	packet_write(1, "unpack %s\n",
	430	unpack_status ? unpack_status : "ok");
	431	for (cmd = commands; cmd; cmd = cmd->next) {
	432	if (!cmd->error_string)
	433	packet_write(1, "ok %s\n",
	434	cmd->ref_name);
	435	else
	436	packet_write(1, "ng %s %s\n",
	437	cmd->ref_name, cmd->error_string);
575f4974	438	}
cfee10a7	439	packet_flush(1);
575f4974 LT	440	}
575f4974 LT	441
d4f694ba JH	442	static int delete_only(struct command *cmd)
	443	{
	444	while (cmd) {
	445	if (!is_null_sha1(cmd->new_sha1))
	446	return 0;
	447	cmd = cmd->next;
	448	}
	449	return 1;
	450	}
	451
575f4974 LT	452	int main(int argc, char **argv)
575f4974 LT	453	{
d0efc8a7	454	int i;
8d630132	455	char *dir = NULL;
575f4974 LT	456
	457	argv++;
	458	for (i = 1; i < argc; i++) {
8d630132	459	char arg = argv++;
575f4974 LT	460
575f4974 LT	461	if (*arg == '-') {
575f4974 LT	462	/* Do flag handling here */
	463	usage(receive_pack_usage);
	464	}
d0efc8a7 LT	465	if (dir)
d0efc8a7 LT	466	usage(receive_pack_usage);
575f4974	467	dir = arg;
575f4974 LT	468	}
	469	if (!dir)
	470	usage(receive_pack_usage);
	471
3159c8dc	472	if (!enter_repo(dir, 0))
8d630132	473	die("'%s': unable to chdir or not a git archive", dir);
575f4974	474
a0022eeb JH	475	if (is_repository_shallow())
	476	die("attempt to push into a shallow repository");
	477
6fb75bed SP	478	git_config(receive_pack_config);
6fb75bed SP	479
e28714c5 JH	480	if (0 <= transfer_unpack_limit)
	481	unpack_limit = transfer_unpack_limit;
	482	else if (0 <= receive_unpack_limit)
	483	unpack_limit = receive_unpack_limit;
	484
8a65ff76	485	write_head_info();
575f4974 LT	486
575f4974 LT	487	/* EOF */
f3a3214e	488	packet_flush(1);
575f4974 LT	489
575f4974 LT	490	read_head_info();
7f8e9828	491	if (commands) {
d4f694ba JH	492	const char *unpack_status = NULL;
	493
	494	if (!delete_only(commands))
	495	unpack_status = unpack();
8aaf7d64	496	execute_commands(unpack_status);
576162a4 NP	497	if (pack_lockfile)
576162a4 NP	498	unlink(pack_lockfile);
cfee10a7 JH	499	if (report_status)
cfee10a7 JH	500	report(unpack_status);
05ef58ec	501	run_hook(post_receive_hook, commands, 0);
8e663d9e	502	run_update_post_hook(commands);
7f8e9828	503	}
575f4974 LT	504	return 0;
575f4974 LT	505	}