[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]);
}

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

static const char **prepare_shell_cmd(const char **argv)
{
	int argc, nargc = 0;
	const char **nargv;

	for (argc = 0; argv[argc]; argc++)
		; /* just counting */
	/* +1 for NULL, +3 for "sh -c" plus extra $0 */
	nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));

	if (argc < 1)
		die("BUG: shell command is empty");

	if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
		nargv[nargc++] = "sh";
		nargv[nargc++] = "-c";

		if (argc < 2)
			nargv[nargc++] = argv[0];
		else {
			struct strbuf arg0 = STRBUF_INIT;
			strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
			nargv[nargc++] = strbuf_detach(&arg0, NULL);
		}
	}

	for (argc = 0; argv[argc]; argc++)
		nargv[nargc++] = argv[argc];
	nargv[nargc] = NULL;

	return nargv;
}

#ifndef WIN32
static int execv_shell_cmd(const char **argv)
{
	const char **nargv = prepare_shell_cmd(argv);
	trace_argv_printf(nargv, "trace: exec:");
	execvp(nargv[0], (char **)nargv);
	free(nargv);
	return -1;
}
#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 if (cmd->use_shell) {
			execv_shell_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);
	} else if (cmd->use_shell) {
		cmd->argv = prepare_shell_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;
	cmd->use_shell = opt & RUN_USING_SHELL ? 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
8dba1e63 JK	20	static const char prepare_shell_cmd(const char argv)
	21	{
	22	int argc, nargc = 0;
	23	const char **nargv;
	24
	25	for (argc = 0; argv[argc]; argc++)
	26	; /* just counting */
	27	/* +1 for NULL, +3 for "sh -c" plus extra $0 */
	28	nargv = xmalloc(sizeof(nargv) (argc + 1 + 3));
	29
	30	if (argc < 1)
	31	die("BUG: shell command is empty");
	32
f445644f JK	33	if (strcspn(argv[0], "\|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
	34	nargv[nargc++] = "sh";
	35	nargv[nargc++] = "-c";
8dba1e63	36
f445644f JK	37	if (argc < 2)
	38	nargv[nargc++] = argv[0];
	39	else {
	40	struct strbuf arg0 = STRBUF_INIT;
	41	strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
	42	nargv[nargc++] = strbuf_detach(&arg0, NULL);
	43	}
8dba1e63 JK	44	}
	45
	46	for (argc = 0; argv[argc]; argc++)
	47	nargv[nargc++] = argv[argc];
	48	nargv[nargc] = NULL;
	49
	50	return nargv;
	51	}
	52
	53	#ifndef WIN32
	54	static int execv_shell_cmd(const char **argv)
	55	{
	56	const char **nargv = prepare_shell_cmd(argv);
	57	trace_argv_printf(nargv, "trace: exec:");
	58	execvp(nargv[0], (char **)nargv);
	59	free(nargv);
	60	return -1;
	61	}
	62	#endif
	63
ebcb5d16	64	int start_command(struct child_process *cmd)
b1bf95bb	65	{
f3b33f1d JS	66	int need_in, need_out, need_err;
f3b33f1d JS	67	int fdin[2], fdout[2], fderr[2];
5a7a3671	68	int failed_errno = failed_errno;
4919bf03	69
c20181e3 JS	70	/*
	71	* In case of errors we must keep the promise to close FDs
	72	* that have been passed in via ->in and ->out.
	73	*/
	74
e4507ae8	75	need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03	76	if (need_in) {
c20181e3	77	if (pipe(fdin) < 0) {
0ac77ec3	78	failed_errno = errno;
c20181e3 JS	79	if (cmd->out > 0)
c20181e3 JS	80	close(cmd->out);
0ac77ec3	81	goto fail_pipe;
c20181e3	82	}
4919bf03	83	cmd->in = fdin[1];
4919bf03 SP	84	}
4919bf03 SP	85
e4507ae8 SP	86	need_out = !cmd->no_stdout
	87	&& !cmd->stdout_to_stderr
	88	&& cmd->out < 0;
f4bba25b SP	89	if (need_out) {
f4bba25b SP	90	if (pipe(fdout) < 0) {
0ac77ec3	91	failed_errno = errno;
f4bba25b SP	92	if (need_in)
f4bba25b SP	93	close_pair(fdin);
c20181e3 JS	94	else if (cmd->in)
c20181e3 JS	95	close(cmd->in);
0ac77ec3	96	goto fail_pipe;
f4bba25b SP	97	}
f4bba25b SP	98	cmd->out = fdout[0];
f4bba25b SP	99	}
f4bba25b SP	100
b73a4397	101	need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d JS	102	if (need_err) {
f3b33f1d JS	103	if (pipe(fderr) < 0) {
0ac77ec3	104	failed_errno = errno;
f3b33f1d JS	105	if (need_in)
f3b33f1d JS	106	close_pair(fdin);
c20181e3 JS	107	else if (cmd->in)
c20181e3 JS	108	close(cmd->in);
f3b33f1d JS	109	if (need_out)
f3b33f1d JS	110	close_pair(fdout);
c20181e3 JS	111	else if (cmd->out)
c20181e3 JS	112	close(cmd->out);
0ac77ec3 JS	113	fail_pipe:
	114	error("cannot create pipe for %s: %s",
	115	cmd->argv[0], strerror(failed_errno));
	116	errno = failed_errno;
	117	return -1;
f3b33f1d JS	118	}
	119	cmd->err = fderr[0];
	120	}
	121
8852f5d7 JS	122	trace_argv_printf(cmd->argv, "trace: run_command:");
8852f5d7 JS	123
71064e3f	124	#ifndef WIN32
7d0b18a4	125	fflush(NULL);
ebcb5d16	126	cmd->pid = fork();
ebcb5d16	127	if (!cmd->pid) {
e4507ae8 SP	128	if (cmd->no_stdin)
	129	dup_devnull(0);
	130	else if (need_in) {
4919bf03	131	dup2(fdin[0], 0);
9dc09c76	132	close_pair(fdin);
4919bf03 SP	133	} else if (cmd->in) {
	134	dup2(cmd->in, 0);
	135	close(cmd->in);
95d3c4f5	136	}
4919bf03	137
ce2cf27a CC	138	if (cmd->no_stderr)
	139	dup_devnull(2);
	140	else if (need_err) {
	141	dup2(fderr[1], 2);
	142	close_pair(fderr);
	143	}
	144
e4507ae8 SP	145	if (cmd->no_stdout)
	146	dup_devnull(1);
	147	else if (cmd->stdout_to_stderr)
cd83c74c	148	dup2(2, 1);
f4bba25b SP	149	else if (need_out) {
	150	dup2(fdout[1], 1);
	151	close_pair(fdout);
	152	} else if (cmd->out > 1) {
	153	dup2(cmd->out, 1);
	154	close(cmd->out);
	155	}
	156
1568fea0	157	if (cmd->dir && chdir(cmd->dir))
d824cbba TR	158	die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
d824cbba TR	159	cmd->dir);
ee493148	160	if (cmd->env) {
3427b375 AR	161	for (; *cmd->env; cmd->env++) {
3427b375 AR	162	if (strchr(*cmd->env, '='))
4b25d091	163	putenv((char )cmd->env);
3427b375 AR	164	else
	165	unsetenv(*cmd->env);
	166	}
ee493148	167	}
ccf08bc3 JK	168	if (cmd->preexec_cb)
ccf08bc3 JK	169	cmd->preexec_cb();
f1000898 SP	170	if (cmd->git_cmd) {
f1000898 SP	171	execv_git_cmd(cmd->argv);
8dba1e63 JK	172	} else if (cmd->use_shell) {
8dba1e63 JK	173	execv_shell_cmd(cmd->argv);
77cb17e9	174	} else {
f1000898	175	execvp(cmd->argv[0], (char const) cmd->argv);
128aed68	176	}
45c0961c JK	177	trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
	178	strerror(errno));
	179	exit(127);
b1bf95bb	180	}
0ac77ec3 JS	181	if (cmd->pid < 0)
	182	error("cannot fork() for %s: %s", cmd->argv[0],
	183	strerror(failed_errno = errno));
ba26f296	184	#else
0d30ad71	185	{
75301f90	186	int fhin = 0, fhout = 1, fherr = 2;
108ac313	187	const char **sargv = cmd->argv;
ba26f296	188	char **env = environ;
ba26f296	189
75301f90 JS	190	if (cmd->no_stdin)
	191	fhin = open("/dev/null", O_RDWR);
	192	else if (need_in)
	193	fhin = dup(fdin[0]);
	194	else if (cmd->in)
	195	fhin = dup(cmd->in);
	196
	197	if (cmd->no_stderr)
	198	fherr = open("/dev/null", O_RDWR);
	199	else if (need_err)
	200	fherr = dup(fderr[1]);
	201
	202	if (cmd->no_stdout)
	203	fhout = open("/dev/null", O_RDWR);
	204	else if (cmd->stdout_to_stderr)
	205	fhout = dup(fherr);
	206	else if (need_out)
	207	fhout = dup(fdout[1]);
	208	else if (cmd->out > 1)
	209	fhout = dup(cmd->out);
ba26f296 JS	210
	211	if (cmd->dir)
	212	die("chdir in start_command() not implemented");
2affea41 JS	213	if (cmd->env)
2affea41 JS	214	env = make_augmented_environ(cmd->env);
ba26f296 JS	215
ba26f296 JS	216	if (cmd->git_cmd) {
108ac313	217	cmd->argv = prepare_git_cmd(cmd->argv);
8dba1e63 JK	218	} else if (cmd->use_shell) {
8dba1e63 JK	219	cmd->argv = prepare_shell_cmd(cmd->argv);
ba26f296 JS	220	}
ba26f296 JS	221
75301f90 JS	222	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env,
75301f90 JS	223	fhin, fhout, fherr);
0ac77ec3	224	failed_errno = errno;
c024beb5	225	if (cmd->pid < 0 && (!cmd->silent_exec_failure \|\| errno != ENOENT))
0ac77ec3	226	error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
ba26f296 JS	227
	228	if (cmd->env)
	229	free_environ(env);
	230	if (cmd->git_cmd)
108ac313	231	free(cmd->argv);
ba26f296	232
108ac313	233	cmd->argv = sargv;
75301f90 JS	234	if (fhin != 0)
	235	close(fhin);
	236	if (fhout != 1)
	237	close(fhout);
	238	if (fherr != 2)
	239	close(fherr);
0d30ad71	240	}
ba26f296 JS	241	#endif
	242
	243	if (cmd->pid < 0) {
	244	if (need_in)
	245	close_pair(fdin);
	246	else if (cmd->in)
	247	close(cmd->in);
	248	if (need_out)
	249	close_pair(fdout);
	250	else if (cmd->out)
	251	close(cmd->out);
	252	if (need_err)
	253	close_pair(fderr);
0ac77ec3 JS	254	errno = failed_errno;
0ac77ec3 JS	255	return -1;
ba26f296	256	}
4919bf03 SP	257
	258	if (need_in)
	259	close(fdin[0]);
	260	else if (cmd->in)
	261	close(cmd->in);
	262
f4bba25b SP	263	if (need_out)
f4bba25b SP	264	close(fdout[1]);
c20181e3	265	else if (cmd->out)
f4bba25b SP	266	close(cmd->out);
f4bba25b SP	267
f3b33f1d JS	268	if (need_err)
	269	close(fderr[1]);
	270
ebcb5d16 SP	271	return 0;
	272	}
	273
c024beb5	274	static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
ebcb5d16	275	{
0ac77ec3 JS	276	int status, code = -1;
	277	pid_t waiting;
	278	int failed_errno = 0;
	279
	280	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
	281	; /* nothing */
	282
	283	if (waiting < 0) {
	284	failed_errno = errno;
	285	error("waitpid for %s failed: %s", argv0, strerror(errno));
	286	} else if (waiting != pid) {
	287	error("waitpid is confused (%s)", argv0);
	288	} else if (WIFSIGNALED(status)) {
b99d5f40 JS	289	code = WTERMSIG(status);
	290	error("%s died of signal %d", argv0, code);
	291	/*
	292	* This return value is chosen so that code & 0xff
	293	* mimics the exit code that a POSIX shell would report for
	294	* a program that died from this signal.
	295	*/
	296	code -= 128;
0ac77ec3	297	} else if (WIFEXITED(status)) {
b1bf95bb	298	code = WEXITSTATUS(status);
0ac77ec3 JS	299	/*
	300	* Convert special exit code when execvp failed.
	301	*/
	302	if (code == 127) {
	303	code = -1;
	304	failed_errno = ENOENT;
c024beb5 JS	305	if (!silent_exec_failure)
	306	error("cannot run %s: %s", argv0,
	307	strerror(ENOENT));
45c0961c	308	}
0ac77ec3 JS	309	} else {
0ac77ec3 JS	310	error("waitpid is confused (%s)", argv0);
b1bf95bb	311	}
0ac77ec3 JS	312	errno = failed_errno;
0ac77ec3 JS	313	return code;
b1bf95bb	314	}
f1000898	315
2d22c208 JS	316	int finish_command(struct child_process *cmd)
2d22c208 JS	317	{
c024beb5	318	return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
2d22c208 JS	319	}
2d22c208 JS	320
ebcb5d16 SP	321	int run_command(struct child_process *cmd)
	322	{
	323	int code = start_command(cmd);
	324	if (code)
	325	return code;
	326	return finish_command(cmd);
	327	}
	328
1568fea0	329	static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148 AR	330	const char **argv,
ee493148 AR	331	int opt)
1568fea0 AR	332	{
	333	memset(cmd, 0, sizeof(*cmd));
	334	cmd->argv = argv;
	335	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
	336	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
	337	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5	338	cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
8dba1e63	339	cmd->use_shell = opt & RUN_USING_SHELL ? 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	}