[git/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]);
}

#ifndef WIN32
static inline void dup_devnull(int to)
{
	int fd = open("/dev/null", O_RDWR);
	dup2(fd, to);
	close(fd);
}
#endif

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

	/*
	 * 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) {
			failed_errno = errno;
			if (cmd->out > 0)
				close(cmd->out);
			goto fail_pipe;
		}
		cmd->in = fdin[1];
	}

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

	need_err = !cmd->no_stderr && cmd->err < 0;
	if (need_err) {
		if (pipe(fderr) < 0) {
			failed_errno = 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);
fail_pipe:
			error("cannot create pipe for %s: %s",
				cmd->argv[0], strerror(failed_errno));
			errno = failed_errno;
			return -1;
		}
		cmd->err = fderr[0];
	}

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

#ifndef WIN32
	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_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
			    cmd->dir);
		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);
	}
	if (cmd->pid < 0)
		error("cannot fork() for %s: %s", cmd->argv[0],
			strerror(failed_errno = errno));
#else
{
	int fhin = 0, fhout = 1, fherr = 2;
	const char **sargv = cmd->argv;
	char **env = environ;

	if (cmd->no_stdin)
		fhin = open("/dev/null", O_RDWR);
	else if (need_in)
		fhin = dup(fdin[0]);
	else if (cmd->in)
		fhin = dup(cmd->in);

	if (cmd->no_stderr)
		fherr = open("/dev/null", O_RDWR);
	else if (need_err)
		fherr = dup(fderr[1]);

	if (cmd->no_stdout)
		fhout = open("/dev/null", O_RDWR);
	else if (cmd->stdout_to_stderr)
		fhout = dup(fherr);
	else if (need_out)
		fhout = dup(fdout[1]);
	else if (cmd->out > 1)
		fhout = dup(cmd->out);

	if (cmd->dir)
		die("chdir in start_command() not implemented");
	if (cmd->env)
		env = make_augmented_environ(cmd->env);

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

	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env,
				  fhin, fhout, fherr);
	failed_errno = errno;
	if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
		error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));

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

	cmd->argv = sargv;
	if (fhin != 0)
		close(fhin);
	if (fhout != 1)
		close(fhout);
	if (fherr != 2)
		close(fherr);
}
#endif

	if (cmd->pid < 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);
		if (need_err)
			close_pair(fderr);
		errno = failed_errno;
		return -1;
	}

	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, const char *argv0, int silent_exec_failure)
{
	int status, code = -1;
	pid_t waiting;
	int failed_errno = 0;

	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
		;	/* nothing */

	if (waiting < 0) {
		failed_errno = errno;
		error("waitpid for %s failed: %s", argv0, strerror(errno));
	} else if (waiting != pid) {
		error("waitpid is confused (%s)", argv0);
	} else if (WIFSIGNALED(status)) {
		code = WTERMSIG(status);
		error("%s died of signal %d", argv0, code);
		/*
		 * This return value is chosen so that code & 0xff
		 * mimics the exit code that a POSIX shell would report for
		 * a program that died from this signal.
		 */
		code -= 128;
	} else if (WIFEXITED(status)) {
		code = WEXITSTATUS(status);
		/*
		 * Convert special exit code when execvp failed.
		 */
		if (code == 127) {
			code = -1;
			failed_errno = ENOENT;
			if (!silent_exec_failure)
				error("cannot run %s: %s", argv0,
					strerror(ENOENT));
		}
	} else {
		error("waitpid is confused (%s)", argv0);
	}
	errno = failed_errno;
	return code;
}

int finish_command(struct child_process *cmd)
{
	return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
}

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;
	cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 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 WIN32
static unsigned __stdcall 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 WIN32
	/* 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 WIN32
	int ret = wait_or_whine(async->pid, "child process", 0);
#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 = run_command(&hook);
	free(argv);
	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
75301f90	11	#ifndef WIN32
e4507ae8 SP	12	static inline void dup_devnull(int to)
	13	{
	14	int fd = open("/dev/null", O_RDWR);
	15	dup2(fd, to);
	16	close(fd);
	17	}
75301f90	18	#endif
e4507ae8	19
ebcb5d16	20	int start_command(struct child_process *cmd)
b1bf95bb	21	{
f3b33f1d JS	22	int need_in, need_out, need_err;
f3b33f1d JS	23	int fdin[2], fdout[2], fderr[2];
5a7a3671	24	int failed_errno = failed_errno;
4919bf03	25
c20181e3 JS	26	/*
	27	* In case of errors we must keep the promise to close FDs
	28	* that have been passed in via ->in and ->out.
	29	*/
	30
e4507ae8	31	need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03	32	if (need_in) {
c20181e3	33	if (pipe(fdin) < 0) {
0ac77ec3	34	failed_errno = errno;
c20181e3 JS	35	if (cmd->out > 0)
c20181e3 JS	36	close(cmd->out);
0ac77ec3	37	goto fail_pipe;
c20181e3	38	}
4919bf03	39	cmd->in = fdin[1];
4919bf03 SP	40	}
4919bf03 SP	41
e4507ae8 SP	42	need_out = !cmd->no_stdout
	43	&& !cmd->stdout_to_stderr
	44	&& cmd->out < 0;
f4bba25b SP	45	if (need_out) {
f4bba25b SP	46	if (pipe(fdout) < 0) {
0ac77ec3	47	failed_errno = errno;
f4bba25b SP	48	if (need_in)
f4bba25b SP	49	close_pair(fdin);
c20181e3 JS	50	else if (cmd->in)
c20181e3 JS	51	close(cmd->in);
0ac77ec3	52	goto fail_pipe;
f4bba25b SP	53	}
f4bba25b SP	54	cmd->out = fdout[0];
f4bba25b SP	55	}
f4bba25b SP	56
b73a4397	57	need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d JS	58	if (need_err) {
f3b33f1d JS	59	if (pipe(fderr) < 0) {
0ac77ec3	60	failed_errno = errno;
f3b33f1d JS	61	if (need_in)
f3b33f1d JS	62	close_pair(fdin);
c20181e3 JS	63	else if (cmd->in)
c20181e3 JS	64	close(cmd->in);
f3b33f1d JS	65	if (need_out)
f3b33f1d JS	66	close_pair(fdout);
c20181e3 JS	67	else if (cmd->out)
c20181e3 JS	68	close(cmd->out);
0ac77ec3 JS	69	fail_pipe:
	70	error("cannot create pipe for %s: %s",
	71	cmd->argv[0], strerror(failed_errno));
	72	errno = failed_errno;
	73	return -1;
f3b33f1d JS	74	}
	75	cmd->err = fderr[0];
	76	}
	77
8852f5d7 JS	78	trace_argv_printf(cmd->argv, "trace: run_command:");
8852f5d7 JS	79
71064e3f	80	#ifndef WIN32
7d0b18a4	81	fflush(NULL);
ebcb5d16	82	cmd->pid = fork();
ebcb5d16	83	if (!cmd->pid) {
e4507ae8 SP	84	if (cmd->no_stdin)
	85	dup_devnull(0);
	86	else if (need_in) {
4919bf03	87	dup2(fdin[0], 0);
9dc09c76	88	close_pair(fdin);
4919bf03 SP	89	} else if (cmd->in) {
	90	dup2(cmd->in, 0);
	91	close(cmd->in);
95d3c4f5	92	}
4919bf03	93
ce2cf27a CC	94	if (cmd->no_stderr)
	95	dup_devnull(2);
	96	else if (need_err) {
	97	dup2(fderr[1], 2);
	98	close_pair(fderr);
	99	}
	100
e4507ae8 SP	101	if (cmd->no_stdout)
	102	dup_devnull(1);
	103	else if (cmd->stdout_to_stderr)
cd83c74c	104	dup2(2, 1);
f4bba25b SP	105	else if (need_out) {
	106	dup2(fdout[1], 1);
	107	close_pair(fdout);
	108	} else if (cmd->out > 1) {
	109	dup2(cmd->out, 1);
	110	close(cmd->out);
	111	}
	112
1568fea0	113	if (cmd->dir && chdir(cmd->dir))
d824cbba TR	114	die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
d824cbba TR	115	cmd->dir);
ee493148	116	if (cmd->env) {
3427b375 AR	117	for (; *cmd->env; cmd->env++) {
3427b375 AR	118	if (strchr(*cmd->env, '='))
4b25d091	119	putenv((char )cmd->env);
3427b375 AR	120	else
	121	unsetenv(*cmd->env);
	122	}
ee493148	123	}
ccf08bc3 JK	124	if (cmd->preexec_cb)
ccf08bc3 JK	125	cmd->preexec_cb();
f1000898 SP	126	if (cmd->git_cmd) {
f1000898 SP	127	execv_git_cmd(cmd->argv);
77cb17e9	128	} else {
f1000898	129	execvp(cmd->argv[0], (char const) cmd->argv);
128aed68	130	}
45c0961c JK	131	trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
	132	strerror(errno));
	133	exit(127);
b1bf95bb	134	}
0ac77ec3 JS	135	if (cmd->pid < 0)
	136	error("cannot fork() for %s: %s", cmd->argv[0],
	137	strerror(failed_errno = errno));
ba26f296	138	#else
0d30ad71	139	{
75301f90	140	int fhin = 0, fhout = 1, fherr = 2;
108ac313	141	const char **sargv = cmd->argv;
ba26f296	142	char **env = environ;
ba26f296	143
75301f90 JS	144	if (cmd->no_stdin)
	145	fhin = open("/dev/null", O_RDWR);
	146	else if (need_in)
	147	fhin = dup(fdin[0]);
	148	else if (cmd->in)
	149	fhin = dup(cmd->in);
	150
	151	if (cmd->no_stderr)
	152	fherr = open("/dev/null", O_RDWR);
	153	else if (need_err)
	154	fherr = dup(fderr[1]);
	155
	156	if (cmd->no_stdout)
	157	fhout = open("/dev/null", O_RDWR);
	158	else if (cmd->stdout_to_stderr)
	159	fhout = dup(fherr);
	160	else if (need_out)
	161	fhout = dup(fdout[1]);
	162	else if (cmd->out > 1)
	163	fhout = dup(cmd->out);
ba26f296 JS	164
	165	if (cmd->dir)
	166	die("chdir in start_command() not implemented");
2affea41 JS	167	if (cmd->env)
2affea41 JS	168	env = make_augmented_environ(cmd->env);
ba26f296 JS	169
ba26f296 JS	170	if (cmd->git_cmd) {
108ac313	171	cmd->argv = prepare_git_cmd(cmd->argv);
ba26f296 JS	172	}
ba26f296 JS	173
75301f90 JS	174	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env,
75301f90 JS	175	fhin, fhout, fherr);
0ac77ec3	176	failed_errno = errno;
c024beb5	177	if (cmd->pid < 0 && (!cmd->silent_exec_failure \|\| errno != ENOENT))
0ac77ec3	178	error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
ba26f296 JS	179
	180	if (cmd->env)
	181	free_environ(env);
	182	if (cmd->git_cmd)
108ac313	183	free(cmd->argv);
ba26f296	184
108ac313	185	cmd->argv = sargv;
75301f90 JS	186	if (fhin != 0)
	187	close(fhin);
	188	if (fhout != 1)
	189	close(fhout);
	190	if (fherr != 2)
	191	close(fherr);
0d30ad71	192	}
ba26f296 JS	193	#endif
	194
	195	if (cmd->pid < 0) {
	196	if (need_in)
	197	close_pair(fdin);
	198	else if (cmd->in)
	199	close(cmd->in);
	200	if (need_out)
	201	close_pair(fdout);
	202	else if (cmd->out)
	203	close(cmd->out);
	204	if (need_err)
	205	close_pair(fderr);
0ac77ec3 JS	206	errno = failed_errno;
0ac77ec3 JS	207	return -1;
ba26f296	208	}
4919bf03 SP	209
	210	if (need_in)
	211	close(fdin[0]);
	212	else if (cmd->in)
	213	close(cmd->in);
	214
f4bba25b SP	215	if (need_out)
f4bba25b SP	216	close(fdout[1]);
c20181e3	217	else if (cmd->out)
f4bba25b SP	218	close(cmd->out);
f4bba25b SP	219
f3b33f1d JS	220	if (need_err)
	221	close(fderr[1]);
	222
ebcb5d16 SP	223	return 0;
	224	}
	225
c024beb5	226	static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
ebcb5d16	227	{
0ac77ec3 JS	228	int status, code = -1;
	229	pid_t waiting;
	230	int failed_errno = 0;
	231
	232	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
	233	; /* nothing */
	234
	235	if (waiting < 0) {
	236	failed_errno = errno;
	237	error("waitpid for %s failed: %s", argv0, strerror(errno));
	238	} else if (waiting != pid) {
	239	error("waitpid is confused (%s)", argv0);
	240	} else if (WIFSIGNALED(status)) {
b99d5f40 JS	241	code = WTERMSIG(status);
	242	error("%s died of signal %d", argv0, code);
	243	/*
	244	* This return value is chosen so that code & 0xff
	245	* mimics the exit code that a POSIX shell would report for
	246	* a program that died from this signal.
	247	*/
	248	code -= 128;
0ac77ec3	249	} else if (WIFEXITED(status)) {
b1bf95bb	250	code = WEXITSTATUS(status);
0ac77ec3 JS	251	/*
	252	* Convert special exit code when execvp failed.
	253	*/
	254	if (code == 127) {
	255	code = -1;
	256	failed_errno = ENOENT;
c024beb5 JS	257	if (!silent_exec_failure)
	258	error("cannot run %s: %s", argv0,
	259	strerror(ENOENT));
45c0961c	260	}
0ac77ec3 JS	261	} else {
0ac77ec3 JS	262	error("waitpid is confused (%s)", argv0);
b1bf95bb	263	}
0ac77ec3 JS	264	errno = failed_errno;
0ac77ec3 JS	265	return code;
b1bf95bb	266	}
f1000898	267
2d22c208 JS	268	int finish_command(struct child_process *cmd)
2d22c208 JS	269	{
c024beb5	270	return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
2d22c208 JS	271	}
2d22c208 JS	272
ebcb5d16 SP	273	int run_command(struct child_process *cmd)
	274	{
	275	int code = start_command(cmd);
	276	if (code)
	277	return code;
	278	return finish_command(cmd);
	279	}
	280
1568fea0	281	static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148 AR	282	const char **argv,
ee493148 AR	283	int opt)
1568fea0 AR	284	{
	285	memset(cmd, 0, sizeof(*cmd));
	286	cmd->argv = argv;
	287	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
	288	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
	289	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5	290	cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
1568fea0 AR	291	}
1568fea0 AR	292
f1000898 SP	293	int run_command_v_opt(const char **argv, int opt)
	294	{
	295	struct child_process cmd;
1568fea0 AR	296	prepare_run_command_v_opt(&cmd, argv, opt);
	297	return run_command(&cmd);
	298	}
	299
ee493148 AR	300	int run_command_v_opt_cd_env(const char *argv, int opt, const char dir, const char const env)
	301	{
	302	struct child_process cmd;
	303	prepare_run_command_v_opt(&cmd, argv, opt);
	304	cmd.dir = dir;
	305	cmd.env = env;
	306	return run_command(&cmd);
	307	}
2d22c208	308
71064e3f	309	#ifdef WIN32
d7fa500f	310	static unsigned __stdcall run_thread(void *data)
618ebe9f JS	311	{
	312	struct async *async = data;
	313	return async->proc(async->fd_for_proc, async->data);
	314	}
	315	#endif
	316
2d22c208 JS	317	int start_async(struct async *async)
	318	{
	319	int pipe_out[2];
	320
	321	if (pipe(pipe_out) < 0)
	322	return error("cannot create pipe: %s", strerror(errno));
618ebe9f	323	async->out = pipe_out[0];
2d22c208	324
71064e3f	325	#ifndef WIN32
2c3766f0 AM	326	/* Flush stdio before fork() to avoid cloning buffers */
	327	fflush(NULL);
	328
2d22c208 JS	329	async->pid = fork();
	330	if (async->pid < 0) {
	331	error("fork (async) failed: %s", strerror(errno));
	332	close_pair(pipe_out);
	333	return -1;
	334	}
	335	if (!async->pid) {
	336	close(pipe_out[0]);
	337	exit(!!async->proc(pipe_out[1], async->data));
	338	}
2d22c208	339	close(pipe_out[1]);
618ebe9f JS	340	#else
	341	async->fd_for_proc = pipe_out[1];
	342	async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
	343	if (!async->tid) {
	344	error("cannot create thread: %s", strerror(errno));
	345	close_pair(pipe_out);
	346	return -1;
	347	}
	348	#endif
2d22c208 JS	349	return 0;
	350	}
	351
	352	int finish_async(struct async *async)
	353	{
71064e3f	354	#ifndef WIN32
c024beb5	355	int ret = wait_or_whine(async->pid, "child process", 0);
618ebe9f JS	356	#else
	357	DWORD ret = 0;
	358	if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
	359	ret = error("waiting for thread failed: %lu", GetLastError());
	360	else if (!GetExitCodeThread(async->tid, &ret))
	361	ret = error("cannot get thread exit code: %lu", GetLastError());
	362	CloseHandle(async->tid);
	363	#endif
2d22c208 JS	364	return ret;
2d22c208 JS	365	}
ae98a008 SB	366
	367	int run_hook(const char index_file, const char name, ...)
	368	{
	369	struct child_process hook;
14e6298f	370	const char *argv = NULL, env[2];
ae98a008 SB	371	char index[PATH_MAX];
	372	va_list args;
	373	int ret;
14e6298f	374	size_t i = 0, alloc = 0;
ae98a008	375
cf94ca8e SB	376	if (access(git_path("hooks/%s", name), X_OK) < 0)
	377	return 0;
	378
ae98a008	379	va_start(args, name);
14e6298f SB	380	ALLOC_GROW(argv, i + 1, alloc);
	381	argv[i++] = git_path("hooks/%s", name);
	382	while (argv[i-1]) {
	383	ALLOC_GROW(argv, i + 1, alloc);
	384	argv[i++] = va_arg(args, const char *);
	385	}
ae98a008 SB	386	va_end(args);
ae98a008 SB	387
ae98a008 SB	388	memset(&hook, 0, sizeof(hook));
	389	hook.argv = argv;
	390	hook.no_stdin = 1;
	391	hook.stdout_to_stderr = 1;
	392	if (index_file) {
	393	snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
	394	env[0] = index;
	395	env[1] = NULL;
	396	hook.env = env;
	397	}
	398
0ac77ec3	399	ret = run_command(&hook);
14e6298f	400	free(argv);
ae98a008 SB	401	return ret;
ae98a008 SB	402	}