[thirdparty/git.git] / run-command.c

#include "cache.h"
#include "run-command.h"
#include "exec_cmd.h"

static inline void close_pair(int fd[2])
{
	close(fd[0]);
	close(fd[1]);
}

static inline void dup_devnull(int to)
{
	int fd = open("/dev/null", O_RDWR);
	dup2(fd, to);
	close(fd);
}

int start_command(struct child_process *cmd)
{
	int need_in, need_out, need_err;
	int fdin[2], fdout[2], fderr[2];

	/*
	 * In case of errors we must keep the promise to close FDs
	 * that have been passed in via ->in and ->out.
	 */

	need_in = !cmd->no_stdin && cmd->in < 0;
	if (need_in) {
		if (pipe(fdin) < 0) {
			if (cmd->out > 0)
				close(cmd->out);
			return -ERR_RUN_COMMAND_PIPE;
		}
		cmd->in = fdin[1];
	}

	need_out = !cmd->no_stdout
		&& !cmd->stdout_to_stderr
		&& cmd->out < 0;
	if (need_out) {
		if (pipe(fdout) < 0) {
			if (need_in)
				close_pair(fdin);
			else if (cmd->in)
				close(cmd->in);
			return -ERR_RUN_COMMAND_PIPE;
		}
		cmd->out = fdout[0];
	}

	need_err = !cmd->no_stderr && cmd->err < 0;
	if (need_err) {
		if (pipe(fderr) < 0) {
			if (need_in)
				close_pair(fdin);
			else if (cmd->in)
				close(cmd->in);
			if (need_out)
				close_pair(fdout);
			else if (cmd->out)
				close(cmd->out);
			return -ERR_RUN_COMMAND_PIPE;
		}
		cmd->err = fderr[0];
	}

	trace_argv_printf(cmd->argv, "trace: run_command:");

#ifndef __MINGW32__
	fflush(NULL);
	cmd->pid = fork();
	if (!cmd->pid) {
		if (cmd->no_stdin)
			dup_devnull(0);
		else if (need_in) {
			dup2(fdin[0], 0);
			close_pair(fdin);
		} else if (cmd->in) {
			dup2(cmd->in, 0);
			close(cmd->in);
		}

		if (cmd->no_stderr)
			dup_devnull(2);
		else if (need_err) {
			dup2(fderr[1], 2);
			close_pair(fderr);
		}

		if (cmd->no_stdout)
			dup_devnull(1);
		else if (cmd->stdout_to_stderr)
			dup2(2, 1);
		else if (need_out) {
			dup2(fdout[1], 1);
			close_pair(fdout);
		} else if (cmd->out > 1) {
			dup2(cmd->out, 1);
			close(cmd->out);
		}

		if (cmd->dir && chdir(cmd->dir))
			die("exec %s: cd to %s failed (%s)", cmd->argv[0],
			    cmd->dir, strerror(errno));
		if (cmd->env) {
			for (; *cmd->env; cmd->env++) {
				if (strchr(*cmd->env, '='))
					putenv((char *)*cmd->env);
				else
					unsetenv(*cmd->env);
			}
		}
		if (cmd->preexec_cb)
			cmd->preexec_cb();
		if (cmd->git_cmd) {
			execv_git_cmd(cmd->argv);
		} else {
			execvp(cmd->argv[0], (char *const*) cmd->argv);
		}
		trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
				strerror(errno));
		exit(127);
	}
#else
	int s0 = -1, s1 = -1, s2 = -1;	/* backups of stdin, stdout, stderr */
	const char **sargv = cmd->argv;
	char **env = environ;

	if (cmd->no_stdin) {
		s0 = dup(0);
		dup_devnull(0);
	} else if (need_in) {
		s0 = dup(0);
		dup2(fdin[0], 0);
	} else if (cmd->in) {
		s0 = dup(0);
		dup2(cmd->in, 0);
	}

	if (cmd->no_stderr) {
		s2 = dup(2);
		dup_devnull(2);
	} else if (need_err) {
		s2 = dup(2);
		dup2(fderr[1], 2);
	}

	if (cmd->no_stdout) {
		s1 = dup(1);
		dup_devnull(1);
	} else if (cmd->stdout_to_stderr) {
		s1 = dup(1);
		dup2(2, 1);
	} else if (need_out) {
		s1 = dup(1);
		dup2(fdout[1], 1);
	} else if (cmd->out > 1) {
		s1 = dup(1);
		dup2(cmd->out, 1);
	}

	if (cmd->dir)
		die("chdir in start_command() not implemented");
	if (cmd->env) {
		env = copy_environ();
		for (; *cmd->env; cmd->env++)
			env = env_setenv(env, *cmd->env);
	}

	if (cmd->git_cmd) {
		cmd->argv = prepare_git_cmd(cmd->argv);
	}

	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);

	if (cmd->env)
		free_environ(env);
	if (cmd->git_cmd)
		free(cmd->argv);

	cmd->argv = sargv;
	if (s0 >= 0)
		dup2(s0, 0), close(s0);
	if (s1 >= 0)
		dup2(s1, 1), close(s1);
	if (s2 >= 0)
		dup2(s2, 2), close(s2);
#endif

	if (cmd->pid < 0) {
		int err = errno;
		if (need_in)
			close_pair(fdin);
		else if (cmd->in)
			close(cmd->in);
		if (need_out)
			close_pair(fdout);
		else if (cmd->out)
			close(cmd->out);
		if (need_err)
			close_pair(fderr);
		return err == ENOENT ?
			-ERR_RUN_COMMAND_EXEC :
			-ERR_RUN_COMMAND_FORK;
	}

	if (need_in)
		close(fdin[0]);
	else if (cmd->in)
		close(cmd->in);

	if (need_out)
		close(fdout[1]);
	else if (cmd->out)
		close(cmd->out);

	if (need_err)
		close(fderr[1]);

	return 0;
}

static int wait_or_whine(pid_t pid)
{
	for (;;) {
		int status, code;
		pid_t waiting = waitpid(pid, &status, 0);

		if (waiting < 0) {
			if (errno == EINTR)
				continue;
			error("waitpid failed (%s)", strerror(errno));
			return -ERR_RUN_COMMAND_WAITPID;
		}
		if (waiting != pid)
			return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
		if (WIFSIGNALED(status))
			return -ERR_RUN_COMMAND_WAITPID_SIGNAL;

		if (!WIFEXITED(status))
			return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
		code = WEXITSTATUS(status);
		return code == 127 ? -ERR_RUN_COMMAND_EXEC : code;
	}
}

int finish_command(struct child_process *cmd)
{
	return wait_or_whine(cmd->pid);
}

int run_command(struct child_process *cmd)
{
	int code = start_command(cmd);
	if (code)
		return code;
	return finish_command(cmd);
}

static void prepare_run_command_v_opt(struct child_process *cmd,
				      const char **argv,
				      int opt)
{
	memset(cmd, 0, sizeof(*cmd));
	cmd->argv = argv;
	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
}

int run_command_v_opt(const char **argv, int opt)
{
	struct child_process cmd;
	prepare_run_command_v_opt(&cmd, argv, opt);
	return run_command(&cmd);
}

int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
{
	struct child_process cmd;
	prepare_run_command_v_opt(&cmd, argv, opt);
	cmd.dir = dir;
	cmd.env = env;
	return run_command(&cmd);
}

#ifdef __MINGW32__
static __stdcall unsigned run_thread(void *data)
{
	struct async *async = data;
	return async->proc(async->fd_for_proc, async->data);
}
#endif

int start_async(struct async *async)
{
	int pipe_out[2];

	if (pipe(pipe_out) < 0)
		return error("cannot create pipe: %s", strerror(errno));
	async->out = pipe_out[0];

#ifndef __MINGW32__
	/* Flush stdio before fork() to avoid cloning buffers */
	fflush(NULL);

	async->pid = fork();
	if (async->pid < 0) {
		error("fork (async) failed: %s", strerror(errno));
		close_pair(pipe_out);
		return -1;
	}
	if (!async->pid) {
		close(pipe_out[0]);
		exit(!!async->proc(pipe_out[1], async->data));
	}
	close(pipe_out[1]);
#else
	async->fd_for_proc = pipe_out[1];
	async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
	if (!async->tid) {
		error("cannot create thread: %s", strerror(errno));
		close_pair(pipe_out);
		return -1;
	}
#endif
	return 0;
}

int finish_async(struct async *async)
{
#ifndef __MINGW32__
	int ret = 0;

	if (wait_or_whine(async->pid))
		ret = error("waitpid (async) failed");
#else
	DWORD ret = 0;
	if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
		ret = error("waiting for thread failed: %lu", GetLastError());
	else if (!GetExitCodeThread(async->tid, &ret))
		ret = error("cannot get thread exit code: %lu", GetLastError());
	CloseHandle(async->tid);
#endif
	return ret;
}

int run_hook(const char *index_file, const char *name, ...)
{
	struct child_process hook;
	const char **argv = NULL, *env[2];
	char index[PATH_MAX];
	va_list args;
	int ret;
	size_t i = 0, alloc = 0;

	if (access(git_path("hooks/%s", name), X_OK) < 0)
		return 0;

	va_start(args, name);
	ALLOC_GROW(argv, i + 1, alloc);
	argv[i++] = git_path("hooks/%s", name);
	while (argv[i-1]) {
		ALLOC_GROW(argv, i + 1, alloc);
		argv[i++] = va_arg(args, const char *);
	}
	va_end(args);

	memset(&hook, 0, sizeof(hook));
	hook.argv = argv;
	hook.no_stdin = 1;
	hook.stdout_to_stderr = 1;
	if (index_file) {
		snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
		env[0] = index;
		env[1] = NULL;
		hook.env = env;
	}

	ret = start_command(&hook);
	free(argv);
	if (ret) {
		warning("Could not spawn %s", argv[0]);
		return ret;
	}
	ret = finish_command(&hook);
	if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
		warning("%s exited due to uncaught signal", argv[0]);

	return ret;
}
Commit	Line	Data
b1bf95bb JW	1	#include "cache.h"
b1bf95bb JW	2	#include "run-command.h"
77cb17e9	3	#include "exec_cmd.h"
b1bf95bb	4
9dc09c76 SP	5	static inline void close_pair(int fd[2])
	6	{
	7	close(fd[0]);
	8	close(fd[1]);
	9	}
	10
e4507ae8 SP	11	static inline void dup_devnull(int to)
	12	{
	13	int fd = open("/dev/null", O_RDWR);
	14	dup2(fd, to);
	15	close(fd);
	16	}
	17
ebcb5d16	18	int start_command(struct child_process *cmd)
b1bf95bb	19	{
f3b33f1d JS	20	int need_in, need_out, need_err;
f3b33f1d JS	21	int fdin[2], fdout[2], fderr[2];
4919bf03	22
c20181e3 JS	23	/*
	24	* In case of errors we must keep the promise to close FDs
	25	* that have been passed in via ->in and ->out.
	26	*/
	27
e4507ae8	28	need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03	29	if (need_in) {
c20181e3 JS	30	if (pipe(fdin) < 0) {
	31	if (cmd->out > 0)
	32	close(cmd->out);
4919bf03	33	return -ERR_RUN_COMMAND_PIPE;
c20181e3	34	}
4919bf03	35	cmd->in = fdin[1];
4919bf03 SP	36	}
4919bf03 SP	37
e4507ae8 SP	38	need_out = !cmd->no_stdout
	39	&& !cmd->stdout_to_stderr
	40	&& cmd->out < 0;
f4bba25b SP	41	if (need_out) {
	42	if (pipe(fdout) < 0) {
	43	if (need_in)
	44	close_pair(fdin);
c20181e3 JS	45	else if (cmd->in)
c20181e3 JS	46	close(cmd->in);
f4bba25b SP	47	return -ERR_RUN_COMMAND_PIPE;
	48	}
	49	cmd->out = fdout[0];
f4bba25b SP	50	}
f4bba25b SP	51
b73a4397	52	need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d JS	53	if (need_err) {
	54	if (pipe(fderr) < 0) {
	55	if (need_in)
	56	close_pair(fdin);
c20181e3 JS	57	else if (cmd->in)
c20181e3 JS	58	close(cmd->in);
f3b33f1d JS	59	if (need_out)
f3b33f1d JS	60	close_pair(fdout);
c20181e3 JS	61	else if (cmd->out)
c20181e3 JS	62	close(cmd->out);
f3b33f1d JS	63	return -ERR_RUN_COMMAND_PIPE;
	64	}
	65	cmd->err = fderr[0];
	66	}
	67
8852f5d7 JS	68	trace_argv_printf(cmd->argv, "trace: run_command:");
8852f5d7 JS	69
ba26f296	70	#ifndef __MINGW32__
7d0b18a4	71	fflush(NULL);
ebcb5d16	72	cmd->pid = fork();
ebcb5d16	73	if (!cmd->pid) {
e4507ae8 SP	74	if (cmd->no_stdin)
	75	dup_devnull(0);
	76	else if (need_in) {
4919bf03	77	dup2(fdin[0], 0);
9dc09c76	78	close_pair(fdin);
4919bf03 SP	79	} else if (cmd->in) {
	80	dup2(cmd->in, 0);
	81	close(cmd->in);
95d3c4f5	82	}
4919bf03	83
ce2cf27a CC	84	if (cmd->no_stderr)
	85	dup_devnull(2);
	86	else if (need_err) {
	87	dup2(fderr[1], 2);
	88	close_pair(fderr);
	89	}
	90
e4507ae8 SP	91	if (cmd->no_stdout)
	92	dup_devnull(1);
	93	else if (cmd->stdout_to_stderr)
cd83c74c	94	dup2(2, 1);
f4bba25b SP	95	else if (need_out) {
	96	dup2(fdout[1], 1);
	97	close_pair(fdout);
	98	} else if (cmd->out > 1) {
	99	dup2(cmd->out, 1);
	100	close(cmd->out);
	101	}
	102
1568fea0 AR	103	if (cmd->dir && chdir(cmd->dir))
	104	die("exec %s: cd to %s failed (%s)", cmd->argv[0],
	105	cmd->dir, strerror(errno));
ee493148	106	if (cmd->env) {
3427b375 AR	107	for (; *cmd->env; cmd->env++) {
3427b375 AR	108	if (strchr(*cmd->env, '='))
4b25d091	109	putenv((char )cmd->env);
3427b375 AR	110	else
	111	unsetenv(*cmd->env);
	112	}
ee493148	113	}
ccf08bc3 JK	114	if (cmd->preexec_cb)
ccf08bc3 JK	115	cmd->preexec_cb();
f1000898 SP	116	if (cmd->git_cmd) {
f1000898 SP	117	execv_git_cmd(cmd->argv);
77cb17e9	118	} else {
f1000898	119	execvp(cmd->argv[0], (char const) cmd->argv);
128aed68	120	}
45c0961c JK	121	trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
	122	strerror(errno));
	123	exit(127);
b1bf95bb	124	}
ba26f296 JS	125	#else
ba26f296 JS	126	int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
108ac313	127	const char **sargv = cmd->argv;
ba26f296	128	char **env = environ;
ba26f296 JS	129
	130	if (cmd->no_stdin) {
	131	s0 = dup(0);
	132	dup_devnull(0);
	133	} else if (need_in) {
	134	s0 = dup(0);
	135	dup2(fdin[0], 0);
	136	} else if (cmd->in) {
	137	s0 = dup(0);
	138	dup2(cmd->in, 0);
	139	}
	140
	141	if (cmd->no_stderr) {
	142	s2 = dup(2);
	143	dup_devnull(2);
	144	} else if (need_err) {
	145	s2 = dup(2);
	146	dup2(fderr[1], 2);
	147	}
	148
	149	if (cmd->no_stdout) {
	150	s1 = dup(1);
	151	dup_devnull(1);
	152	} else if (cmd->stdout_to_stderr) {
	153	s1 = dup(1);
	154	dup2(2, 1);
	155	} else if (need_out) {
	156	s1 = dup(1);
	157	dup2(fdout[1], 1);
	158	} else if (cmd->out > 1) {
	159	s1 = dup(1);
	160	dup2(cmd->out, 1);
	161	}
	162
	163	if (cmd->dir)
	164	die("chdir in start_command() not implemented");
	165	if (cmd->env) {
	166	env = copy_environ();
	167	for (; *cmd->env; cmd->env++)
	168	env = env_setenv(env, *cmd->env);
	169	}
	170
	171	if (cmd->git_cmd) {
108ac313	172	cmd->argv = prepare_git_cmd(cmd->argv);
ba26f296 JS	173	}
ba26f296 JS	174
7e5d7768	175	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
ba26f296 JS	176
	177	if (cmd->env)
	178	free_environ(env);
	179	if (cmd->git_cmd)
108ac313	180	free(cmd->argv);
ba26f296	181
108ac313	182	cmd->argv = sargv;
ba26f296 JS	183	if (s0 >= 0)
	184	dup2(s0, 0), close(s0);
	185	if (s1 >= 0)
	186	dup2(s1, 1), close(s1);
	187	if (s2 >= 0)
	188	dup2(s2, 2), close(s2);
	189	#endif
	190
	191	if (cmd->pid < 0) {
45c0961c	192	int err = errno;
ba26f296 JS	193	if (need_in)
	194	close_pair(fdin);
	195	else if (cmd->in)
	196	close(cmd->in);
	197	if (need_out)
	198	close_pair(fdout);
	199	else if (cmd->out)
	200	close(cmd->out);
	201	if (need_err)
	202	close_pair(fderr);
45c0961c JK	203	return err == ENOENT ?
	204	-ERR_RUN_COMMAND_EXEC :
	205	-ERR_RUN_COMMAND_FORK;
ba26f296	206	}
4919bf03 SP	207
	208	if (need_in)
	209	close(fdin[0]);
	210	else if (cmd->in)
	211	close(cmd->in);
	212
f4bba25b SP	213	if (need_out)
f4bba25b SP	214	close(fdout[1]);
c20181e3	215	else if (cmd->out)
f4bba25b SP	216	close(cmd->out);
f4bba25b SP	217
f3b33f1d JS	218	if (need_err)
	219	close(fderr[1]);
	220
ebcb5d16 SP	221	return 0;
	222	}
	223
2d22c208	224	static int wait_or_whine(pid_t pid)
ebcb5d16	225	{
b1bf95bb JW	226	for (;;) {
b1bf95bb JW	227	int status, code;
2d22c208	228	pid_t waiting = waitpid(pid, &status, 0);
b1bf95bb	229
6f002f98	230	if (waiting < 0) {
b1bf95bb JW	231	if (errno == EINTR)
b1bf95bb JW	232	continue;
6f002f98	233	error("waitpid failed (%s)", strerror(errno));
b1bf95bb JW	234	return -ERR_RUN_COMMAND_WAITPID;
b1bf95bb JW	235	}
2d22c208	236	if (waiting != pid)
b1bf95bb JW	237	return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
	238	if (WIFSIGNALED(status))
	239	return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
	240
	241	if (!WIFEXITED(status))
	242	return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
	243	code = WEXITSTATUS(status);
5709e036	244	return code == 127 ? -ERR_RUN_COMMAND_EXEC : code;
b1bf95bb JW	245	}
b1bf95bb JW	246	}
f1000898	247
2d22c208 JS	248	int finish_command(struct child_process *cmd)
2d22c208 JS	249	{
2d22c208 JS	250	return wait_or_whine(cmd->pid);
	251	}
	252
ebcb5d16 SP	253	int run_command(struct child_process *cmd)
	254	{
	255	int code = start_command(cmd);
	256	if (code)
	257	return code;
	258	return finish_command(cmd);
	259	}
	260
1568fea0	261	static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148 AR	262	const char **argv,
ee493148 AR	263	int opt)
1568fea0 AR	264	{
	265	memset(cmd, 0, sizeof(*cmd));
	266	cmd->argv = argv;
	267	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
	268	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
	269	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
	270	}
	271
f1000898 SP	272	int run_command_v_opt(const char **argv, int opt)
	273	{
	274	struct child_process cmd;
1568fea0 AR	275	prepare_run_command_v_opt(&cmd, argv, opt);
	276	return run_command(&cmd);
	277	}
	278
ee493148 AR	279	int run_command_v_opt_cd_env(const char *argv, int opt, const char dir, const char const env)
	280	{
	281	struct child_process cmd;
	282	prepare_run_command_v_opt(&cmd, argv, opt);
	283	cmd.dir = dir;
	284	cmd.env = env;
	285	return run_command(&cmd);
	286	}
2d22c208	287
618ebe9f JS	288	#ifdef __MINGW32__
	289	static __stdcall unsigned run_thread(void *data)
	290	{
	291	struct async *async = data;
	292	return async->proc(async->fd_for_proc, async->data);
	293	}
	294	#endif
	295
2d22c208 JS	296	int start_async(struct async *async)
	297	{
	298	int pipe_out[2];
	299
	300	if (pipe(pipe_out) < 0)
	301	return error("cannot create pipe: %s", strerror(errno));
618ebe9f	302	async->out = pipe_out[0];
2d22c208	303
618ebe9f	304	#ifndef __MINGW32__
2c3766f0 AM	305	/* Flush stdio before fork() to avoid cloning buffers */
	306	fflush(NULL);
	307
2d22c208 JS	308	async->pid = fork();
	309	if (async->pid < 0) {
	310	error("fork (async) failed: %s", strerror(errno));
	311	close_pair(pipe_out);
	312	return -1;
	313	}
	314	if (!async->pid) {
	315	close(pipe_out[0]);
	316	exit(!!async->proc(pipe_out[1], async->data));
	317	}
2d22c208	318	close(pipe_out[1]);
618ebe9f JS	319	#else
	320	async->fd_for_proc = pipe_out[1];
	321	async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
	322	if (!async->tid) {
	323	error("cannot create thread: %s", strerror(errno));
	324	close_pair(pipe_out);
	325	return -1;
	326	}
	327	#endif
2d22c208 JS	328	return 0;
	329	}
	330
	331	int finish_async(struct async *async)
	332	{
618ebe9f	333	#ifndef __MINGW32__
2d22c208 JS	334	int ret = 0;
	335
	336	if (wait_or_whine(async->pid))
	337	ret = error("waitpid (async) failed");
618ebe9f JS	338	#else
	339	DWORD ret = 0;
	340	if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
	341	ret = error("waiting for thread failed: %lu", GetLastError());
	342	else if (!GetExitCodeThread(async->tid, &ret))
	343	ret = error("cannot get thread exit code: %lu", GetLastError());
	344	CloseHandle(async->tid);
	345	#endif
2d22c208 JS	346	return ret;
2d22c208 JS	347	}
ae98a008 SB	348
	349	int run_hook(const char index_file, const char name, ...)
	350	{
	351	struct child_process hook;
14e6298f	352	const char *argv = NULL, env[2];
ae98a008 SB	353	char index[PATH_MAX];
	354	va_list args;
	355	int ret;
14e6298f	356	size_t i = 0, alloc = 0;
ae98a008	357
cf94ca8e SB	358	if (access(git_path("hooks/%s", name), X_OK) < 0)
	359	return 0;
	360
ae98a008	361	va_start(args, name);
14e6298f SB	362	ALLOC_GROW(argv, i + 1, alloc);
	363	argv[i++] = git_path("hooks/%s", name);
	364	while (argv[i-1]) {
	365	ALLOC_GROW(argv, i + 1, alloc);
	366	argv[i++] = va_arg(args, const char *);
	367	}
ae98a008 SB	368	va_end(args);
ae98a008 SB	369
ae98a008 SB	370	memset(&hook, 0, sizeof(hook));
	371	hook.argv = argv;
	372	hook.no_stdin = 1;
	373	hook.stdout_to_stderr = 1;
	374	if (index_file) {
	375	snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
	376	env[0] = index;
	377	env[1] = NULL;
	378	hook.env = env;
	379	}
	380
	381	ret = start_command(&hook);
14e6298f	382	free(argv);
ae98a008 SB	383	if (ret) {
	384	warning("Could not spawn %s", argv[0]);
	385	return ret;
	386	}
	387	ret = finish_command(&hook);
	388	if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
	389	warning("%s exited due to uncaught signal", argv[0]);
	390
	391	return ret;
	392	}