[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);
}

#ifndef WIN32
static int child_err = 2;

static NORETURN void die_child(const char *err, va_list params)
{
	char msg[4096];
	int len = vsnprintf(msg, sizeof(msg), err, params);
	if (len > sizeof(msg))
		len = sizeof(msg);

	write(child_err, "fatal: ", 7);
	write(child_err, msg, len);
	write(child_err, "\n", 1);
	exit(128);
}

static inline void set_cloexec(int fd)
{
	int flags = fcntl(fd, F_GETFD);
	if (flags >= 0)
		fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}
#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) {
		/*
		 * Redirect the channel to write syscall error messages to
		 * before redirecting the process's stderr so that all die()
		 * in subsequent call paths use the parent's stderr.
		 */
		if (cmd->no_stderr || need_err) {
			child_err = dup(2);
			set_cloexec(child_err);
		}
		set_die_routine(die_child);

		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);
		}
		/*
		 * Do not check for cmd->silent_exec_failure; the parent
		 * process will check it when it sees this exit code.
		 */
		if (errno == ENOENT)
			exit(127);
		else
			die_errno("cannot exec '%s'", cmd->argv[0]);
	}
	if (cmd->pid < 0)
		error("cannot fork() for %s: %s", cmd->argv[0],
			strerror(failed_errno = errno));
#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 = 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);
	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 (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) {
		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
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
a5487ddf JS	18	#ifndef WIN32
	19	static int child_err = 2;
	20
	21	static NORETURN void die_child(const char *err, va_list params)
	22	{
	23	char msg[4096];
	24	int len = vsnprintf(msg, sizeof(msg), err, params);
	25	if (len > sizeof(msg))
	26	len = sizeof(msg);
	27
	28	write(child_err, "fatal: ", 7);
	29	write(child_err, msg, len);
	30	write(child_err, "\n", 1);
	31	exit(128);
	32	}
	33
	34	static inline void set_cloexec(int fd)
	35	{
	36	int flags = fcntl(fd, F_GETFD);
	37	if (flags >= 0)
	38	fcntl(fd, F_SETFD, flags \| FD_CLOEXEC);
	39	}
	40	#endif
	41
ebcb5d16	42	int start_command(struct child_process *cmd)
b1bf95bb	43	{
f3b33f1d JS	44	int need_in, need_out, need_err;
f3b33f1d JS	45	int fdin[2], fdout[2], fderr[2];
5a7a3671	46	int failed_errno = failed_errno;
4919bf03	47
c20181e3 JS	48	/*
	49	* In case of errors we must keep the promise to close FDs
	50	* that have been passed in via ->in and ->out.
	51	*/
	52
e4507ae8	53	need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03	54	if (need_in) {
c20181e3	55	if (pipe(fdin) < 0) {
0ac77ec3	56	failed_errno = errno;
c20181e3 JS	57	if (cmd->out > 0)
c20181e3 JS	58	close(cmd->out);
0ac77ec3	59	goto fail_pipe;
c20181e3	60	}
4919bf03	61	cmd->in = fdin[1];
4919bf03 SP	62	}
4919bf03 SP	63
e4507ae8 SP	64	need_out = !cmd->no_stdout
	65	&& !cmd->stdout_to_stderr
	66	&& cmd->out < 0;
f4bba25b SP	67	if (need_out) {
f4bba25b SP	68	if (pipe(fdout) < 0) {
0ac77ec3	69	failed_errno = errno;
f4bba25b SP	70	if (need_in)
f4bba25b SP	71	close_pair(fdin);
c20181e3 JS	72	else if (cmd->in)
c20181e3 JS	73	close(cmd->in);
0ac77ec3	74	goto fail_pipe;
f4bba25b SP	75	}
f4bba25b SP	76	cmd->out = fdout[0];
f4bba25b SP	77	}
f4bba25b SP	78
b73a4397	79	need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d JS	80	if (need_err) {
f3b33f1d JS	81	if (pipe(fderr) < 0) {
0ac77ec3	82	failed_errno = errno;
f3b33f1d JS	83	if (need_in)
f3b33f1d JS	84	close_pair(fdin);
c20181e3 JS	85	else if (cmd->in)
c20181e3 JS	86	close(cmd->in);
f3b33f1d JS	87	if (need_out)
f3b33f1d JS	88	close_pair(fdout);
c20181e3 JS	89	else if (cmd->out)
c20181e3 JS	90	close(cmd->out);
0ac77ec3 JS	91	fail_pipe:
	92	error("cannot create pipe for %s: %s",
	93	cmd->argv[0], strerror(failed_errno));
	94	errno = failed_errno;
	95	return -1;
f3b33f1d JS	96	}
	97	cmd->err = fderr[0];
	98	}
	99
8852f5d7 JS	100	trace_argv_printf(cmd->argv, "trace: run_command:");
8852f5d7 JS	101
71064e3f	102	#ifndef WIN32
7d0b18a4	103	fflush(NULL);
ebcb5d16	104	cmd->pid = fork();
ebcb5d16	105	if (!cmd->pid) {
a5487ddf JS	106	/*
	107	* Redirect the channel to write syscall error messages to
	108	* before redirecting the process's stderr so that all die()
	109	* in subsequent call paths use the parent's stderr.
	110	*/
	111	if (cmd->no_stderr \|\| need_err) {
	112	child_err = dup(2);
	113	set_cloexec(child_err);
	114	}
	115	set_die_routine(die_child);
	116
e4507ae8 SP	117	if (cmd->no_stdin)
	118	dup_devnull(0);
	119	else if (need_in) {
4919bf03	120	dup2(fdin[0], 0);
9dc09c76	121	close_pair(fdin);
4919bf03 SP	122	} else if (cmd->in) {
	123	dup2(cmd->in, 0);
	124	close(cmd->in);
95d3c4f5	125	}
4919bf03	126
ce2cf27a CC	127	if (cmd->no_stderr)
	128	dup_devnull(2);
	129	else if (need_err) {
	130	dup2(fderr[1], 2);
	131	close_pair(fderr);
	132	}
	133
e4507ae8 SP	134	if (cmd->no_stdout)
	135	dup_devnull(1);
	136	else if (cmd->stdout_to_stderr)
cd83c74c	137	dup2(2, 1);
f4bba25b SP	138	else if (need_out) {
	139	dup2(fdout[1], 1);
	140	close_pair(fdout);
	141	} else if (cmd->out > 1) {
	142	dup2(cmd->out, 1);
	143	close(cmd->out);
	144	}
	145
1568fea0	146	if (cmd->dir && chdir(cmd->dir))
d824cbba TR	147	die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
d824cbba TR	148	cmd->dir);
ee493148	149	if (cmd->env) {
3427b375 AR	150	for (; *cmd->env; cmd->env++) {
3427b375 AR	151	if (strchr(*cmd->env, '='))
4b25d091	152	putenv((char )cmd->env);
3427b375 AR	153	else
	154	unsetenv(*cmd->env);
	155	}
ee493148	156	}
ccf08bc3 JK	157	if (cmd->preexec_cb)
ccf08bc3 JK	158	cmd->preexec_cb();
f1000898 SP	159	if (cmd->git_cmd) {
f1000898 SP	160	execv_git_cmd(cmd->argv);
77cb17e9	161	} else {
f1000898	162	execvp(cmd->argv[0], (char const) cmd->argv);
128aed68	163	}
a5487ddf JS	164	/*
	165	* Do not check for cmd->silent_exec_failure; the parent
	166	* process will check it when it sees this exit code.
	167	*/
	168	if (errno == ENOENT)
	169	exit(127);
	170	else
	171	die_errno("cannot exec '%s'", cmd->argv[0]);
b1bf95bb	172	}
0ac77ec3 JS	173	if (cmd->pid < 0)
	174	error("cannot fork() for %s: %s", cmd->argv[0],
	175	strerror(failed_errno = errno));
ba26f296	176	#else
0d30ad71	177	{
ba26f296	178	int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
108ac313	179	const char **sargv = cmd->argv;
ba26f296	180	char **env = environ;
ba26f296 JS	181
	182	if (cmd->no_stdin) {
	183	s0 = dup(0);
	184	dup_devnull(0);
	185	} else if (need_in) {
	186	s0 = dup(0);
	187	dup2(fdin[0], 0);
	188	} else if (cmd->in) {
	189	s0 = dup(0);
	190	dup2(cmd->in, 0);
	191	}
	192
	193	if (cmd->no_stderr) {
	194	s2 = dup(2);
	195	dup_devnull(2);
	196	} else if (need_err) {
	197	s2 = dup(2);
	198	dup2(fderr[1], 2);
	199	}
	200
	201	if (cmd->no_stdout) {
	202	s1 = dup(1);
	203	dup_devnull(1);
	204	} else if (cmd->stdout_to_stderr) {
	205	s1 = dup(1);
	206	dup2(2, 1);
	207	} else if (need_out) {
	208	s1 = dup(1);
	209	dup2(fdout[1], 1);
	210	} else if (cmd->out > 1) {
	211	s1 = dup(1);
	212	dup2(cmd->out, 1);
	213	}
	214
	215	if (cmd->dir)
	216	die("chdir in start_command() not implemented");
2affea41 JS	217	if (cmd->env)
2affea41 JS	218	env = make_augmented_environ(cmd->env);
ba26f296 JS	219
ba26f296 JS	220	if (cmd->git_cmd) {
108ac313	221	cmd->argv = prepare_git_cmd(cmd->argv);
ba26f296 JS	222	}
ba26f296 JS	223
7e5d7768	224	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
0ac77ec3	225	failed_errno = errno;
c024beb5	226	if (cmd->pid < 0 && (!cmd->silent_exec_failure \|\| errno != ENOENT))
0ac77ec3	227	error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
ba26f296 JS	228
	229	if (cmd->env)
	230	free_environ(env);
	231	if (cmd->git_cmd)
108ac313	232	free(cmd->argv);
ba26f296	233
108ac313	234	cmd->argv = sargv;
ba26f296 JS	235	if (s0 >= 0)
	236	dup2(s0, 0), close(s0);
	237	if (s1 >= 0)
	238	dup2(s1, 1), close(s1);
	239	if (s2 >= 0)
	240	dup2(s2, 2), close(s2);
0d30ad71	241	}
ba26f296 JS	242	#endif
	243
	244	if (cmd->pid < 0) {
	245	if (need_in)
	246	close_pair(fdin);
	247	else if (cmd->in)
	248	close(cmd->in);
	249	if (need_out)
	250	close_pair(fdout);
	251	else if (cmd->out)
	252	close(cmd->out);
	253	if (need_err)
	254	close_pair(fderr);
0ac77ec3 JS	255	errno = failed_errno;
0ac77ec3 JS	256	return -1;
ba26f296	257	}
4919bf03 SP	258
	259	if (need_in)
	260	close(fdin[0]);
	261	else if (cmd->in)
	262	close(cmd->in);
	263
f4bba25b SP	264	if (need_out)
f4bba25b SP	265	close(fdout[1]);
c20181e3	266	else if (cmd->out)
f4bba25b SP	267	close(cmd->out);
f4bba25b SP	268
f3b33f1d JS	269	if (need_err)
	270	close(fderr[1]);
	271
ebcb5d16 SP	272	return 0;
	273	}
	274
c024beb5	275	static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
ebcb5d16	276	{
0ac77ec3 JS	277	int status, code = -1;
	278	pid_t waiting;
	279	int failed_errno = 0;
	280
	281	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
	282	; /* nothing */
	283
	284	if (waiting < 0) {
	285	failed_errno = errno;
	286	error("waitpid for %s failed: %s", argv0, strerror(errno));
	287	} else if (waiting != pid) {
	288	error("waitpid is confused (%s)", argv0);
	289	} else if (WIFSIGNALED(status)) {
b99d5f40 JS	290	code = WTERMSIG(status);
	291	error("%s died of signal %d", argv0, code);
	292	/*
	293	* This return value is chosen so that code & 0xff
	294	* mimics the exit code that a POSIX shell would report for
	295	* a program that died from this signal.
	296	*/
	297	code -= 128;
0ac77ec3	298	} else if (WIFEXITED(status)) {
b1bf95bb	299	code = WEXITSTATUS(status);
0ac77ec3 JS	300	/*
	301	* Convert special exit code when execvp failed.
	302	*/
	303	if (code == 127) {
	304	code = -1;
	305	failed_errno = ENOENT;
c024beb5 JS	306	if (!silent_exec_failure)
	307	error("cannot run %s: %s", argv0,
	308	strerror(ENOENT));
45c0961c	309	}
0ac77ec3 JS	310	} else {
0ac77ec3 JS	311	error("waitpid is confused (%s)", argv0);
b1bf95bb	312	}
0ac77ec3 JS	313	errno = failed_errno;
0ac77ec3 JS	314	return code;
b1bf95bb	315	}
f1000898	316
2d22c208 JS	317	int finish_command(struct child_process *cmd)
2d22c208 JS	318	{
c024beb5	319	return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
2d22c208 JS	320	}
2d22c208 JS	321
ebcb5d16 SP	322	int run_command(struct child_process *cmd)
	323	{
	324	int code = start_command(cmd);
	325	if (code)
	326	return code;
	327	return finish_command(cmd);
	328	}
	329
1568fea0	330	static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148 AR	331	const char **argv,
ee493148 AR	332	int opt)
1568fea0 AR	333	{
	334	memset(cmd, 0, sizeof(*cmd));
	335	cmd->argv = argv;
	336	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
	337	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
	338	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5	339	cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
1568fea0 AR	340	}
1568fea0 AR	341
f1000898 SP	342	int run_command_v_opt(const char **argv, int opt)
	343	{
	344	struct child_process cmd;
1568fea0 AR	345	prepare_run_command_v_opt(&cmd, argv, opt);
	346	return run_command(&cmd);
	347	}
	348
ee493148 AR	349	int run_command_v_opt_cd_env(const char *argv, int opt, const char dir, const char const env)
	350	{
	351	struct child_process cmd;
	352	prepare_run_command_v_opt(&cmd, argv, opt);
	353	cmd.dir = dir;
	354	cmd.env = env;
	355	return run_command(&cmd);
	356	}
2d22c208	357
71064e3f	358	#ifdef WIN32
d7fa500f	359	static unsigned __stdcall run_thread(void *data)
618ebe9f JS	360	{
	361	struct async *async = data;
	362	return async->proc(async->fd_for_proc, async->data);
	363	}
	364	#endif
	365
2d22c208 JS	366	int start_async(struct async *async)
	367	{
	368	int pipe_out[2];
	369
	370	if (pipe(pipe_out) < 0)
	371	return error("cannot create pipe: %s", strerror(errno));
618ebe9f	372	async->out = pipe_out[0];
2d22c208	373
71064e3f	374	#ifndef WIN32
2c3766f0 AM	375	/* Flush stdio before fork() to avoid cloning buffers */
	376	fflush(NULL);
	377
2d22c208 JS	378	async->pid = fork();
	379	if (async->pid < 0) {
	380	error("fork (async) failed: %s", strerror(errno));
	381	close_pair(pipe_out);
	382	return -1;
	383	}
	384	if (!async->pid) {
	385	close(pipe_out[0]);
	386	exit(!!async->proc(pipe_out[1], async->data));
	387	}
2d22c208	388	close(pipe_out[1]);
618ebe9f JS	389	#else
	390	async->fd_for_proc = pipe_out[1];
	391	async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
	392	if (!async->tid) {
	393	error("cannot create thread: %s", strerror(errno));
	394	close_pair(pipe_out);
	395	return -1;
	396	}
	397	#endif
2d22c208 JS	398	return 0;
	399	}
	400
	401	int finish_async(struct async *async)
	402	{
71064e3f	403	#ifndef WIN32
c024beb5	404	int ret = wait_or_whine(async->pid, "child process", 0);
618ebe9f JS	405	#else
	406	DWORD ret = 0;
	407	if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
	408	ret = error("waiting for thread failed: %lu", GetLastError());
	409	else if (!GetExitCodeThread(async->tid, &ret))
	410	ret = error("cannot get thread exit code: %lu", GetLastError());
	411	CloseHandle(async->tid);
	412	#endif
2d22c208 JS	413	return ret;
2d22c208 JS	414	}
ae98a008 SB	415
	416	int run_hook(const char index_file, const char name, ...)
	417	{
	418	struct child_process hook;
14e6298f	419	const char *argv = NULL, env[2];
ae98a008 SB	420	char index[PATH_MAX];
	421	va_list args;
	422	int ret;
14e6298f	423	size_t i = 0, alloc = 0;
ae98a008	424
cf94ca8e SB	425	if (access(git_path("hooks/%s", name), X_OK) < 0)
	426	return 0;
	427
ae98a008	428	va_start(args, name);
14e6298f SB	429	ALLOC_GROW(argv, i + 1, alloc);
	430	argv[i++] = git_path("hooks/%s", name);
	431	while (argv[i-1]) {
	432	ALLOC_GROW(argv, i + 1, alloc);
	433	argv[i++] = va_arg(args, const char *);
	434	}
ae98a008 SB	435	va_end(args);
ae98a008 SB	436
ae98a008 SB	437	memset(&hook, 0, sizeof(hook));
	438	hook.argv = argv;
	439	hook.no_stdin = 1;
	440	hook.stdout_to_stderr = 1;
	441	if (index_file) {
	442	snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
	443	env[0] = index;
	444	env[1] = NULL;
	445	hook.env = env;
	446	}
	447
0ac77ec3	448	ret = run_command(&hook);
14e6298f	449	free(argv);
ae98a008 SB	450	return ret;
ae98a008 SB	451	}