[thirdparty/git.git] / builtin-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"
#include "remote.h"
#include "transport.h"

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

enum deny_action {
	DENY_IGNORE,
	DENY_WARN,
	DENY_REFUSE,
};

static int deny_deletes = 0;
static int deny_non_fast_forwards = 0;
static enum deny_action deny_current_branch = DENY_WARN;
static int receive_fsck_objects;
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 enum deny_action parse_deny_action(const char *var, const char *value)
{
	if (value) {
		if (!strcasecmp(value, "ignore"))
			return DENY_IGNORE;
		if (!strcasecmp(value, "warn"))
			return DENY_WARN;
		if (!strcasecmp(value, "refuse"))
			return DENY_REFUSE;
	}
	if (git_config_bool(var, value))
		return DENY_REFUSE;
	return DENY_IGNORE;
}

static int receive_pack_config(const char *var, const char *value, void *cb)
{
	if (strcmp(var, "receive.denydeletes") == 0) {
		deny_deletes = git_config_bool(var, value);
		return 0;
	}

	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;
	}

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

	if (!strcmp(var, "receive.denycurrentbranch")) {
		deny_current_branch = parse_deny_action(var, value);
		return 0;
	}

	return git_default_config(var, value, cb);
}

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_receive_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 int is_ref_checked_out(const char *ref)
{
	unsigned char sha1[20];
	const char *head;

	if (is_bare_repository())
		return 0;

	head = resolve_ref("HEAD", sha1, 0, NULL);
	if (!head)
		return 0;
	return !strcmp(head, ref);
}

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";
	}

	switch (deny_current_branch) {
	case DENY_IGNORE:
		break;
	case DENY_WARN:
		if (!is_ref_checked_out(name))
			break;
		warning("updating the currently checked out branch; this may"
			" cause confusion,\n"
			"as the index and working tree do not reflect changes"
			" that are now in HEAD.");
		break;
	case DENY_REFUSE:
		if (!is_ref_checked_out(name))
			break;
		error("refusing to update checked out branch: %s", name);
		return "branch is currently checked out";
	}

	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_deletes && is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !prefixcmp(name, "refs/heads/")) {
		error("denying ref deletion for %s", name);
		return "deletion prohibited";
	}
	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, 0)) {
			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_receive_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=%"PRIu32",%"PRIu32,
			ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));

	if (ntohl(hdr.hdr_entries) < unpack_limit) {
		int code, i = 0;
		const char *unpacker[4];
		unpacker[i++] = "unpack-objects";
		if (receive_fsck_objects)
			unpacker[i++] = "--strict";
		unpacker[i++] = hdr_arg;
		unpacker[i++] = 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[7];
		int s, status, i = 0;
		char keep_arg[256];
		struct child_process ip;

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

		keeper[i++] = "index-pack";
		keeper[i++] = "--stdin";
		if (receive_fsck_objects)
			keeper[i++] = "--strict";
		keeper[i++] = "--fix-thin";
		keeper[i++] = hdr_arg;
		keeper[i++] = keep_arg;
		keeper[i++] = 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;
}

static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
{
	char *other;
	size_t len;
	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;

	e->name[-1] = '\0';
	other = xstrdup(make_absolute_path(e->base));
	e->name[-1] = '/';
	len = strlen(other);

	while (other[len-1] == '/')
		other[--len] = '\0';
	if (len < 8 || memcmp(other + len - 8, "/objects", 8))
		return 0;
	/* Is this a git repository with refs? */
	memcpy(other + len - 8, "/refs", 6);
	if (!is_directory(other))
		return 0;
	other[len - 8] = '\0';
	remote = remote_get(other);
	transport = transport_get(remote, other);
	for (extra = transport_get_remote_refs(transport);
	     extra;
	     extra = extra->next) {
		add_extra_ref(".have", extra->old_sha1, 0);
	}
	transport_disconnect(transport);
	free(other);
	return 0;
}

static void add_alternate_refs(void)
{
	foreach_alt_odb(add_refs_from_alternate, NULL);
}

int cmd_receive_pack(int argc, const char **argv, const char *prefix)
{
	int i;
	char *dir = NULL;

	argv++;
	for (i = 1; i < argc; i++) {
		const char *arg = *argv++;

		if (*arg == '-') {
			/* Do flag handling here */
			usage(receive_pack_usage);
		}
		if (dir)
			usage(receive_pack_usage);
		dir = xstrdup(arg);
	}
	if (!dir)
		usage(receive_pack_usage);

	setup_path();

	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, NULL);

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

	add_alternate_refs();
	write_head_info();
	clear_extra_refs();

	/* 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_receive_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"
d79796bc JH	9	#include "remote.h"
d79796bc JH	10	#include "transport.h"
575f4974	11
d0efc8a7	12	static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
575f4974	13
986e8239 JK	14	enum deny_action {
	15	DENY_IGNORE,
	16	DENY_WARN,
	17	DENY_REFUSE,
	18	};
	19
a240de11	20	static int deny_deletes = 0;
6fb75bed	21	static int deny_non_fast_forwards = 0;
986e8239	22	static enum deny_action deny_current_branch = DENY_WARN;
20dc0016	23	static int receive_fsck_objects;
e28714c5 JH	24	static int receive_unpack_limit = -1;
e28714c5 JH	25	static int transfer_unpack_limit = -1;
46732fae	26	static int unpack_limit = 100;
96f1e58f	27	static int report_status;
cfee10a7	28
d4f694ba	29	static char capabilities[] = " report-status delete-refs ";
96f1e58f	30	static int capabilities_sent;
cfee10a7	31
986e8239 JK	32	static enum deny_action parse_deny_action(const char var, const char value)
	33	{
	34	if (value) {
	35	if (!strcasecmp(value, "ignore"))
	36	return DENY_IGNORE;
	37	if (!strcasecmp(value, "warn"))
	38	return DENY_WARN;
	39	if (!strcasecmp(value, "refuse"))
	40	return DENY_REFUSE;
	41	}
	42	if (git_config_bool(var, value))
	43	return DENY_REFUSE;
	44	return DENY_IGNORE;
	45	}
	46
ef90d6d4	47	static int receive_pack_config(const char var, const char value, void *cb)
6fb75bed	48	{
a240de11 JK	49	if (strcmp(var, "receive.denydeletes") == 0) {
	50	deny_deletes = git_config_bool(var, value);
	51	return 0;
	52	}
	53
e28714c5	54	if (strcmp(var, "receive.denynonfastforwards") == 0) {
6fb75bed SP	55	deny_non_fast_forwards = git_config_bool(var, value);
	56	return 0;
	57	}
	58
e28714c5 JH	59	if (strcmp(var, "receive.unpacklimit") == 0) {
e28714c5 JH	60	receive_unpack_limit = git_config_int(var, value);
fc04c412 SP	61	return 0;
	62	}
	63
e28714c5 JH	64	if (strcmp(var, "transfer.unpacklimit") == 0) {
	65	transfer_unpack_limit = git_config_int(var, value);
	66	return 0;
	67	}
	68
20dc0016 MK	69	if (strcmp(var, "receive.fsckobjects") == 0) {
	70	receive_fsck_objects = git_config_bool(var, value);
	71	return 0;
	72	}
	73
986e8239 JK	74	if (!strcmp(var, "receive.denycurrentbranch")) {
	75	deny_current_branch = parse_deny_action(var, value);
	76	return 0;
	77	}
	78
ef90d6d4	79	return git_default_config(var, value, cb);
6fb75bed SP	80	}
6fb75bed SP	81
8da19775	82	static int show_ref(const char path, const unsigned char sha1, int flag, void *cb_data)
575f4974	83	{
cfee10a7 JH	84	if (capabilities_sent)
	85	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	86	else
	87	packet_write(1, "%s %s%c%s\n",
	88	sha1_to_hex(sha1), path, 0, capabilities);
	89	capabilities_sent = 1;
8a65ff76	90	return 0;
575f4974 LT	91	}
575f4974 LT	92
8a65ff76	93	static void write_head_info(void)
575f4974	94	{
cb5d709f	95	for_each_ref(show_ref, NULL);
cfee10a7	96	if (!capabilities_sent)
8da19775	97	show_ref("capabilities^{}", null_sha1, 0, NULL);
cfee10a7	98
575f4974 LT	99	}
575f4974 LT	100
eb1af2df LT	101	struct command {
eb1af2df LT	102	struct command *next;
cfee10a7	103	const char *error_string;
eb1af2df LT	104	unsigned char old_sha1[20];
eb1af2df LT	105	unsigned char new_sha1[20];
8f1d2e6f	106	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	107	};
575f4974 LT	108
96f1e58f	109	static struct command *commands;
575f4974	110
05ef58ec SP	111	static const char pre_receive_hook[] = "hooks/pre-receive";
05ef58ec SP	112	static const char post_receive_hook[] = "hooks/post-receive";
b1bf95bb	113
6c319a22 SP	114	static int hook_status(int code, const char *hook_name)
	115	{
	116	switch (code) {
	117	case 0:
	118	return 0;
	119	case -ERR_RUN_COMMAND_FORK:
	120	return error("hook fork failed");
	121	case -ERR_RUN_COMMAND_EXEC:
	122	return error("hook execute failed");
f43cd49f SP	123	case -ERR_RUN_COMMAND_PIPE:
f43cd49f SP	124	return error("hook pipe failed");
6c319a22 SP	125	case -ERR_RUN_COMMAND_WAITPID:
	126	return error("waitpid failed");
	127	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	128	return error("waitpid is confused");
	129	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	130	return error("%s died of signal", hook_name);
	131	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	132	return error("%s died strangely", hook_name);
	133	default:
	134	error("%s exited with error code %d", hook_name, -code);
	135	return -code;
	136	}
	137	}
	138
ae98a008	139	static int run_receive_hook(const char *hook_name)
b1bf95bb	140	{
f43cd49f	141	static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
c8dd2771	142	struct command *cmd;
f43cd49f SP	143	struct child_process proc;
	144	const char *argv[2];
	145	int have_input = 0, code;
c8dd2771	146
f43cd49f	147	for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
c8dd2771	148	if (!cmd->error_string)
f43cd49f	149	have_input = 1;
c8dd2771	150	}
b1bf95bb	151
f43cd49f	152	if (!have_input \|\| access(hook_name, X_OK) < 0)
b1bf95bb	153	return 0;
c8dd2771	154
c8dd2771	155	argv[0] = hook_name;
f43cd49f SP	156	argv[1] = NULL;
	157
	158	memset(&proc, 0, sizeof(proc));
	159	proc.argv = argv;
	160	proc.in = -1;
	161	proc.stdout_to_stderr = 1;
	162
	163	code = start_command(&proc);
	164	if (code)
	165	return hook_status(code, hook_name);
	166	for (cmd = commands; cmd; cmd = cmd->next) {
c8dd2771	167	if (!cmd->error_string) {
f43cd49f SP	168	size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
	169	sha1_to_hex(cmd->old_sha1),
	170	sha1_to_hex(cmd->new_sha1),
	171	cmd->ref_name);
	172	if (write_in_full(proc.in, buf, n) != n)
	173	break;
c8dd2771	174	}
c8dd2771	175	}
e72ae288	176	close(proc.in);
f43cd49f	177	return hook_status(finish_command(&proc), hook_name);
b1bf95bb JW	178	}
b1bf95bb JW	179
1d9e8b56 SP	180	static int run_update_hook(struct command *cmd)
	181	{
	182	static const char update_hook[] = "hooks/update";
	183	struct child_process proc;
	184	const char *argv[5];
	185
	186	if (access(update_hook, X_OK) < 0)
	187	return 0;
	188
	189	argv[0] = update_hook;
	190	argv[1] = cmd->ref_name;
	191	argv[2] = sha1_to_hex(cmd->old_sha1);
	192	argv[3] = sha1_to_hex(cmd->new_sha1);
	193	argv[4] = NULL;
	194
	195	memset(&proc, 0, sizeof(proc));
	196	proc.argv = argv;
	197	proc.no_stdin = 1;
	198	proc.stdout_to_stderr = 1;
	199
	200	return hook_status(run_command(&proc), update_hook);
	201	}
	202
986e8239 JK	203	static int is_ref_checked_out(const char *ref)
	204	{
	205	unsigned char sha1[20];
	206	const char *head;
	207
	208	if (is_bare_repository())
	209	return 0;
	210
	211	head = resolve_ref("HEAD", sha1, 0, NULL);
	212	if (!head)
	213	return 0;
	214	return !strcmp(head, ref);
	215	}
	216
8aaf7d64	217	static const char update(struct command cmd)
2eca23da	218	{
cfee10a7 JH	219	const char *name = cmd->ref_name;
	220	unsigned char *old_sha1 = cmd->old_sha1;
	221	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc	222	struct ref_lock *lock;
2eca23da	223
061d6b9a MK	224	/* only refs/... are allowed */
061d6b9a MK	225	if (prefixcmp(name, "refs/") \|\| check_ref_format(name + 5)) {
0b8293f6	226	error("refusing to create funny ref '%s' remotely", name);
8aaf7d64	227	return "funny refname";
cfee10a7	228	}
d8a1deec	229
986e8239 JK	230	switch (deny_current_branch) {
	231	case DENY_IGNORE:
	232	break;
	233	case DENY_WARN:
	234	if (!is_ref_checked_out(name))
	235	break;
	236	warning("updating the currently checked out branch; this may"
	237	" cause confusion,\n"
	238	"as the index and working tree do not reflect changes"
	239	" that are now in HEAD.");
	240	break;
	241	case DENY_REFUSE:
	242	if (!is_ref_checked_out(name))
	243	break;
	244	error("refusing to update checked out branch: %s", name);
	245	return "branch is currently checked out";
	246	}
	247
d4f694ba	248	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
8aaf7d64 SP	249	error("unpack should have generated %s, "
	250	"but I can't find it!", sha1_to_hex(new_sha1));
	251	return "bad pack";
cfee10a7	252	}
a240de11 JK	253	if (deny_deletes && is_null_sha1(new_sha1) &&
	254	!is_null_sha1(old_sha1) &&
	255	!prefixcmp(name, "refs/heads/")) {
	256	error("denying ref deletion for %s", name);
	257	return "deletion prohibited";
	258	}
d4f694ba	259	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	260	!is_null_sha1(old_sha1) &&
cc44c765	261	!prefixcmp(name, "refs/heads/")) {
eab82707	262	struct object old_object, new_object;
11031d7e	263	struct commit old_commit, new_commit;
9edd7e46	264	struct commit_list bases, ent;
11031d7e	265
eab82707 MK	266	old_object = parse_object(old_sha1);
	267	new_object = parse_object(new_sha1);
	268
	269	if (!old_object \|\| !new_object \|\|
	270	old_object->type != OBJ_COMMIT \|\|
	271	new_object->type != OBJ_COMMIT) {
	272	error("bad sha1 objects for %s", name);
	273	return "bad ref";
	274	}
	275	old_commit = (struct commit *)old_object;
	276	new_commit = (struct commit *)new_object;
9edd7e46 JS	277	bases = get_merge_bases(old_commit, new_commit, 1);
	278	for (ent = bases; ent; ent = ent->next)
	279	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	280	break;
9edd7e46	281	free_commit_list(bases);
8aaf7d64 SP	282	if (!ent) {
	283	error("denying non-fast forward %s"
	284	" (you should pull first)", name);
	285	return "non-fast forward";
	286	}
11031d7e	287	}
1d9e8b56	288	if (run_update_hook(cmd)) {
8aaf7d64 SP	289	error("hook declined to update %s", name);
8aaf7d64 SP	290	return "hook declined";
b1bf95bb	291	}
3159c8dc	292
d4f694ba	293	if (is_null_sha1(new_sha1)) {
28391a80 JS	294	if (!parse_object(old_sha1)) {
	295	warning ("Allowing deletion of corrupt ref.");
	296	old_sha1 = NULL;
	297	}
eca35a25	298	if (delete_ref(name, old_sha1, 0)) {
8aaf7d64 SP	299	error("failed to delete %s", name);
8aaf7d64 SP	300	return "failed to delete";
d4f694ba	301	}
8aaf7d64	302	return NULL; /* good */
d4f694ba JH	303	}
d4f694ba JH	304	else {
68db31cc	305	lock = lock_any_ref_for_update(name, old_sha1, 0);
d4f694ba	306	if (!lock) {
8aaf7d64 SP	307	error("failed to lock %s", name);
8aaf7d64 SP	308	return "failed to lock";
d4f694ba	309	}
ef203f08	310	if (write_ref_sha1(lock, new_sha1, "push")) {
8aaf7d64	311	return "failed to write"; /* error() already called */
ef203f08	312	}
8aaf7d64	313	return NULL; /* good */
19614330	314	}
2eca23da LT	315	}
2eca23da LT	316
19614330 JH	317	static char update_post_hook[] = "hooks/post-update";
	318
	319	static void run_update_post_hook(struct command *cmd)
	320	{
	321	struct command *cmd_p;
	322	int argc;
9201c707	323	const char **argv;
19614330	324
3e6e152c	325	for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	326	if (cmd_p->error_string)
19614330 JH	327	continue;
	328	argc++;
	329	}
3e6e152c SP	330	if (!argc \|\| access(update_post_hook, X_OK) < 0)
	331	return;
	332	argv = xmalloc(sizeof(argv) (2 + argc));
19614330 JH	333	argv[0] = update_post_hook;
	334
	335	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	336	char *p;
cfee10a7	337	if (cmd_p->error_string)
19614330	338	continue;
9201c707 JH	339	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	340	strcpy(p, cmd_p->ref_name);
	341	argv[argc] = p;
19614330 JH	342	argc++;
	343	}
	344	argv[argc] = NULL;
95d3c4f5 SP	345	run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
95d3c4f5 SP	346	\| RUN_COMMAND_STDOUT_TO_STDERR);
19614330	347	}
2eca23da	348
8aaf7d64	349	static void execute_commands(const char *unpacker_error)
575f4974	350	{
eb1af2df	351	struct command *cmd = commands;
8aaf7d64 SP	352
	353	if (unpacker_error) {
	354	while (cmd) {
	355	cmd->error_string = "n/a (unpacker error)";
	356	cmd = cmd->next;
	357	}
	358	return;
	359	}
	360
ae98a008	361	if (run_receive_hook(pre_receive_hook)) {
05ef58ec SP	362	while (cmd) {
	363	cmd->error_string = "pre-receive hook declined";
	364	cmd = cmd->next;
	365	}
	366	return;
	367	}
	368
eb1af2df	369	while (cmd) {
8aaf7d64	370	cmd->error_string = update(cmd);
eb1af2df	371	cmd = cmd->next;
575f4974 LT	372	}
	373	}
	374
	375	static void read_head_info(void)
	376	{
eb1af2df	377	struct command **p = &commands;
575f4974 LT	378	for (;;) {
575f4974 LT	379	static char line[1000];
eb1af2df LT	380	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	381	struct command *cmd;
cfee10a7 JH	382	char *refname;
cfee10a7 JH	383	int len, reflen;
eb1af2df LT	384
eb1af2df LT	385	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	386	if (!len)
575f4974 LT	387	break;
eb1af2df LT	388	if (line[len-1] == '\n')
	389	line[--len] = 0;
	390	if (len < 83 \|\|
	391	line[40] != ' ' \|\|
	392	line[81] != ' ' \|\|
	393	get_sha1_hex(line, old_sha1) \|\|
	394	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	395	die("protocol error: expected old/new/ref, got '%s'",
	396	line);
	397
	398	refname = line + 82;
	399	reflen = strlen(refname);
	400	if (reflen + 82 < len) {
	401	if (strstr(refname + reflen + 1, "report-status"))
	402	report_status = 1;
	403	}
eb1af2df	404	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	405	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	406	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	407	memcpy(cmd->ref_name, line + 82, len - 81);
8aaf7d64	408	cmd->error_string = NULL;
eb1af2df LT	409	cmd->next = NULL;
	410	*p = cmd;
	411	p = &cmd->next;
575f4974 LT	412	}
	413	}
	414
fc04c412 SP	415	static const char parse_pack_header(struct pack_header hdr)
fc04c412 SP	416	{
a69e5429 JH	417	switch (read_pack_header(0, hdr)) {
	418	case PH_ERROR_EOF:
	419	return "eof before pack header was fully read";
	420
	421	case PH_ERROR_PACK_SIGNATURE:
fc04c412	422	return "protocol error (pack signature mismatch detected)";
a69e5429 JH	423
a69e5429 JH	424	case PH_ERROR_PROTOCOL:
fc04c412	425	return "protocol error (pack version unsupported)";
a69e5429 JH	426
	427	default:
	428	return "unknown error in parse_pack_header";
	429
	430	case 0:
	431	return NULL;
	432	}
fc04c412 SP	433	}
fc04c412 SP	434
576162a4 NP	435	static const char *pack_lockfile;
576162a4 NP	436
861ed121	437	static const char *unpack(void)
575f4974	438	{
fc04c412 SP	439	struct pack_header hdr;
	440	const char *hdr_err;
	441	char hdr_arg[38];
fc04c412 SP	442
	443	hdr_err = parse_pack_header(&hdr);
	444	if (hdr_err)
	445	return hdr_err;
6e1c2344 RJ	446	snprintf(hdr_arg, sizeof(hdr_arg),
6e1c2344 RJ	447	"--pack_header=%"PRIu32",%"PRIu32,
fc04c412 SP	448	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	449
	450	if (ntohl(hdr.hdr_entries) < unpack_limit) {
20dc0016 MK	451	int code, i = 0;
	452	const char *unpacker[4];
	453	unpacker[i++] = "unpack-objects";
	454	if (receive_fsck_objects)
	455	unpacker[i++] = "--strict";
	456	unpacker[i++] = hdr_arg;
	457	unpacker[i++] = NULL;
9b0b5093	458	code = run_command_v_opt(unpacker, RUN_GIT_CMD);
576162a4	459	switch (code) {
fc04c412 SP	460	case 0:
	461	return NULL;
	462	case -ERR_RUN_COMMAND_FORK:
	463	return "unpack fork failed";
	464	case -ERR_RUN_COMMAND_EXEC:
	465	return "unpack execute failed";
	466	case -ERR_RUN_COMMAND_WAITPID:
	467	return "waitpid failed";
	468	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	469	return "waitpid is confused";
	470	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	471	return "unpacker died of signal";
	472	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	473	return "unpacker died strangely";
	474	default:
	475	return "unpacker exited with error code";
576162a4 NP	476	}
576162a4 NP	477	} else {
20dc0016 MK	478	const char *keeper[7];
20dc0016 MK	479	int s, status, i = 0;
576162a4	480	char keep_arg[256];
e8016abf	481	struct child_process ip;
576162a4	482
85e72830	483	s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
576162a4 NP	484	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	485	strcpy(keep_arg + s, "localhost");
	486
20dc0016 MK	487	keeper[i++] = "index-pack";
	488	keeper[i++] = "--stdin";
	489	if (receive_fsck_objects)
	490	keeper[i++] = "--strict";
	491	keeper[i++] = "--fix-thin";
	492	keeper[i++] = hdr_arg;
	493	keeper[i++] = keep_arg;
	494	keeper[i++] = NULL;
e8016abf SP	495	memset(&ip, 0, sizeof(ip));
	496	ip.argv = keeper;
	497	ip.out = -1;
	498	ip.git_cmd = 1;
	499	if (start_command(&ip))
576162a4	500	return "index-pack fork failed";
106764e6	501	pack_lockfile = index_pack_lockfile(ip.out);
e72ae288	502	close(ip.out);
e8016abf SP	503	status = finish_command(&ip);
e8016abf SP	504	if (!status) {
576162a4 NP	505	reprepare_packed_git();
	506	return NULL;
	507	}
	508	return "index-pack abnormal exit";
cfee10a7 JH	509	}
	510	}
	511
	512	static void report(const char *unpack_status)
	513	{
	514	struct command *cmd;
	515	packet_write(1, "unpack %s\n",
	516	unpack_status ? unpack_status : "ok");
	517	for (cmd = commands; cmd; cmd = cmd->next) {
	518	if (!cmd->error_string)
	519	packet_write(1, "ok %s\n",
	520	cmd->ref_name);
	521	else
	522	packet_write(1, "ng %s %s\n",
	523	cmd->ref_name, cmd->error_string);
575f4974	524	}
cfee10a7	525	packet_flush(1);
575f4974 LT	526	}
575f4974 LT	527
d4f694ba JH	528	static int delete_only(struct command *cmd)
	529	{
	530	while (cmd) {
	531	if (!is_null_sha1(cmd->new_sha1))
	532	return 0;
	533	cmd = cmd->next;
	534	}
	535	return 1;
	536	}
	537
d79796bc JH	538	static int add_refs_from_alternate(struct alternate_object_database e, void unused)
d79796bc JH	539	{
b8492539 JH	540	char *other;
b8492539 JH	541	size_t len;
d79796bc JH	542	struct remote *remote;
	543	struct transport *transport;
	544	const struct ref *extra;
	545
b8492539 JH	546	e->name[-1] = '\0';
	547	other = xstrdup(make_absolute_path(e->base));
	548	e->name[-1] = '/';
	549	len = strlen(other);
	550
d79796bc JH	551	while (other[len-1] == '/')
	552	other[--len] = '\0';
	553	if (len < 8 \|\| memcmp(other + len - 8, "/objects", 8))
	554	return 0;
	555	/* Is this a git repository with refs? */
	556	memcpy(other + len - 8, "/refs", 6);
	557	if (!is_directory(other))
	558	return 0;
	559	other[len - 8] = '\0';
	560	remote = remote_get(other);
	561	transport = transport_get(remote, other);
	562	for (extra = transport_get_remote_refs(transport);
	563	extra;
	564	extra = extra->next) {
	565	add_extra_ref(".have", extra->old_sha1, 0);
	566	}
	567	transport_disconnect(transport);
	568	free(other);
	569	return 0;
	570	}
	571
	572	static void add_alternate_refs(void)
	573	{
	574	foreach_alt_odb(add_refs_from_alternate, NULL);
	575	}
	576
be5908ae	577	int cmd_receive_pack(int argc, const char *argv, const char prefix)
575f4974	578	{
d0efc8a7	579	int i;
8d630132	580	char *dir = NULL;
575f4974 LT	581
	582	argv++;
	583	for (i = 1; i < argc; i++) {
be5908ae	584	const char arg = argv++;
575f4974 LT	585
575f4974 LT	586	if (*arg == '-') {
575f4974 LT	587	/* Do flag handling here */
	588	usage(receive_pack_usage);
	589	}
d0efc8a7 LT	590	if (dir)
d0efc8a7 LT	591	usage(receive_pack_usage);
be5908ae	592	dir = xstrdup(arg);
575f4974 LT	593	}
	594	if (!dir)
	595	usage(receive_pack_usage);
	596
e1464ca7	597	setup_path();
5c09f321	598
3159c8dc	599	if (!enter_repo(dir, 0))
8d630132	600	die("'%s': unable to chdir or not a git archive", dir);
575f4974	601
a0022eeb JH	602	if (is_repository_shallow())
	603	die("attempt to push into a shallow repository");
	604
ef90d6d4	605	git_config(receive_pack_config, NULL);
6fb75bed	606
e28714c5 JH	607	if (0 <= transfer_unpack_limit)
	608	unpack_limit = transfer_unpack_limit;
	609	else if (0 <= receive_unpack_limit)
	610	unpack_limit = receive_unpack_limit;
	611
d79796bc	612	add_alternate_refs();
8a65ff76	613	write_head_info();
d79796bc	614	clear_extra_refs();
575f4974 LT	615
575f4974 LT	616	/* EOF */
f3a3214e	617	packet_flush(1);
575f4974 LT	618
575f4974 LT	619	read_head_info();
7f8e9828	620	if (commands) {
d4f694ba JH	621	const char *unpack_status = NULL;
	622
	623	if (!delete_only(commands))
	624	unpack_status = unpack();
8aaf7d64	625	execute_commands(unpack_status);
576162a4 NP	626	if (pack_lockfile)
576162a4 NP	627	unlink(pack_lockfile);
cfee10a7 JH	628	if (report_status)
cfee10a7 JH	629	report(unpack_status);
ae98a008	630	run_receive_hook(post_receive_hook);
8e663d9e	631	run_update_post_hook(commands);
7f8e9828	632	}
575f4974 LT	633	return 0;
575f4974 LT	634	}