Update draft release notes to 1.8.2
[git/git.git] / run-command.c
CommitLineData
b1bf95bb
JW
1#include "cache.h"
2#include "run-command.h"
77cb17e9 3#include "exec_cmd.h"
afe19ff7 4#include "sigchain.h"
5d40a179 5#include "argv-array.h"
b1bf95bb 6
b3e34ddd
BW
7#ifndef SHELL_PATH
8# define SHELL_PATH "/bin/sh"
9#endif
10
afe19ff7
JK
11struct child_to_clean {
12 pid_t pid;
13 struct child_to_clean *next;
14};
15static struct child_to_clean *children_to_clean;
16static int installed_child_cleanup_handler;
17
18static void cleanup_children(int sig)
19{
20 while (children_to_clean) {
21 struct child_to_clean *p = children_to_clean;
22 children_to_clean = p->next;
23 kill(p->pid, sig);
24 free(p);
25 }
26}
27
28static void cleanup_children_on_signal(int sig)
29{
30 cleanup_children(sig);
31 sigchain_pop(sig);
32 raise(sig);
33}
34
35static void cleanup_children_on_exit(void)
36{
37 cleanup_children(SIGTERM);
38}
39
40static void mark_child_for_cleanup(pid_t pid)
41{
42 struct child_to_clean *p = xmalloc(sizeof(*p));
43 p->pid = pid;
44 p->next = children_to_clean;
45 children_to_clean = p;
46
47 if (!installed_child_cleanup_handler) {
48 atexit(cleanup_children_on_exit);
49 sigchain_push_common(cleanup_children_on_signal);
50 installed_child_cleanup_handler = 1;
51 }
52}
53
54static void clear_child_for_cleanup(pid_t pid)
55{
bdee397d 56 struct child_to_clean **pp;
afe19ff7 57
bdee397d
DG
58 for (pp = &children_to_clean; *pp; pp = &(*pp)->next) {
59 struct child_to_clean *clean_me = *pp;
60
61 if (clean_me->pid == pid) {
62 *pp = clean_me->next;
63 free(clean_me);
afe19ff7
JK
64 return;
65 }
66 }
67}
68
9dc09c76
SP
69static inline void close_pair(int fd[2])
70{
71 close(fd[0]);
72 close(fd[1]);
73}
74
75301f90 75#ifndef WIN32
e4507ae8
SP
76static inline void dup_devnull(int to)
77{
78 int fd = open("/dev/null", O_RDWR);
79 dup2(fd, to);
80 close(fd);
81}
75301f90 82#endif
e4507ae8 83
38f865c2
JK
84static char *locate_in_PATH(const char *file)
85{
86 const char *p = getenv("PATH");
87 struct strbuf buf = STRBUF_INIT;
88
89 if (!p || !*p)
90 return NULL;
91
92 while (1) {
93 const char *end = strchrnul(p, ':');
94
95 strbuf_reset(&buf);
96
97 /* POSIX specifies an empty entry as the current directory. */
98 if (end != p) {
99 strbuf_add(&buf, p, end - p);
100 strbuf_addch(&buf, '/');
101 }
102 strbuf_addstr(&buf, file);
103
104 if (!access(buf.buf, F_OK))
105 return strbuf_detach(&buf, NULL);
106
107 if (!*end)
108 break;
109 p = end + 1;
110 }
111
112 strbuf_release(&buf);
113 return NULL;
114}
115
116static int exists_in_PATH(const char *file)
117{
118 char *r = locate_in_PATH(file);
119 free(r);
120 return r != NULL;
121}
122
123int sane_execvp(const char *file, char * const argv[])
124{
125 if (!execvp(file, argv))
126 return 0; /* cannot happen ;-) */
127
128 /*
129 * When a command can't be found because one of the directories
130 * listed in $PATH is unsearchable, execvp reports EACCES, but
131 * careful usability testing (read: analysis of occasional bug
132 * reports) reveals that "No such file or directory" is more
133 * intuitive.
134 *
135 * We avoid commands with "/", because execvp will not do $PATH
136 * lookups in that case.
137 *
138 * The reassignment of EACCES to errno looks like a no-op below,
139 * but we need to protect against exists_in_PATH overwriting errno.
140 */
141 if (errno == EACCES && !strchr(file, '/'))
142 errno = exists_in_PATH(file) ? EACCES : ENOENT;
a7855083
JH
143 else if (errno == ENOTDIR && !strchr(file, '/'))
144 errno = ENOENT;
38f865c2
JK
145 return -1;
146}
147
8dba1e63
JK
148static const char **prepare_shell_cmd(const char **argv)
149{
150 int argc, nargc = 0;
151 const char **nargv;
152
153 for (argc = 0; argv[argc]; argc++)
154 ; /* just counting */
155 /* +1 for NULL, +3 for "sh -c" plus extra $0 */
156 nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
157
158 if (argc < 1)
159 die("BUG: shell command is empty");
160
f445644f 161 if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
77629754 162#ifndef WIN32
b3e34ddd 163 nargv[nargc++] = SHELL_PATH;
77629754
JS
164#else
165 nargv[nargc++] = "sh";
166#endif
f445644f 167 nargv[nargc++] = "-c";
8dba1e63 168
f445644f
JK
169 if (argc < 2)
170 nargv[nargc++] = argv[0];
171 else {
172 struct strbuf arg0 = STRBUF_INIT;
173 strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
174 nargv[nargc++] = strbuf_detach(&arg0, NULL);
175 }
8dba1e63
JK
176 }
177
178 for (argc = 0; argv[argc]; argc++)
179 nargv[nargc++] = argv[argc];
180 nargv[nargc] = NULL;
181
182 return nargv;
183}
184
185#ifndef WIN32
186static int execv_shell_cmd(const char **argv)
187{
188 const char **nargv = prepare_shell_cmd(argv);
189 trace_argv_printf(nargv, "trace: exec:");
38f865c2 190 sane_execvp(nargv[0], (char **)nargv);
8dba1e63
JK
191 free(nargv);
192 return -1;
193}
194#endif
195
a5487ddf
JS
196#ifndef WIN32
197static int child_err = 2;
2b541bf8
JS
198static int child_notifier = -1;
199
200static void notify_parent(void)
201{
a111eb78
JN
202 /*
203 * execvp failed. If possible, we'd like to let start_command
204 * know, so failures like ENOENT can be handled right away; but
205 * otherwise, finish_command will still report the error.
206 */
207 xwrite(child_notifier, "", 1);
2b541bf8 208}
a5487ddf
JS
209
210static NORETURN void die_child(const char *err, va_list params)
211{
3bc4181f 212 vwritef(child_err, "fatal: ", err, params);
a5487ddf
JS
213 exit(128);
214}
3bc4181f
CB
215
216static void error_child(const char *err, va_list params)
217{
218 vwritef(child_err, "error: ", err, params);
219}
200a76b7 220#endif
a5487ddf
JS
221
222static inline void set_cloexec(int fd)
223{
224 int flags = fcntl(fd, F_GETFD);
225 if (flags >= 0)
226 fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
227}
a5487ddf 228
13274526 229static int wait_or_whine(pid_t pid, const char *argv0)
ab0b41da
JS
230{
231 int status, code = -1;
232 pid_t waiting;
233 int failed_errno = 0;
234
235 while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
236 ; /* nothing */
237
238 if (waiting < 0) {
239 failed_errno = errno;
240 error("waitpid for %s failed: %s", argv0, strerror(errno));
241 } else if (waiting != pid) {
242 error("waitpid is confused (%s)", argv0);
243 } else if (WIFSIGNALED(status)) {
244 code = WTERMSIG(status);
a2767c5c
JK
245 if (code != SIGINT && code != SIGQUIT)
246 error("%s died of signal %d", argv0, code);
ab0b41da
JS
247 /*
248 * This return value is chosen so that code & 0xff
249 * mimics the exit code that a POSIX shell would report for
250 * a program that died from this signal.
251 */
709ca730 252 code += 128;
ab0b41da
JS
253 } else if (WIFEXITED(status)) {
254 code = WEXITSTATUS(status);
255 /*
256 * Convert special exit code when execvp failed.
257 */
258 if (code == 127) {
259 code = -1;
260 failed_errno = ENOENT;
ab0b41da
JS
261 }
262 } else {
263 error("waitpid is confused (%s)", argv0);
264 }
afe19ff7
JK
265
266 clear_child_for_cleanup(pid);
267
ab0b41da
JS
268 errno = failed_errno;
269 return code;
270}
271
ebcb5d16 272int start_command(struct child_process *cmd)
b1bf95bb 273{
f3b33f1d
JS
274 int need_in, need_out, need_err;
275 int fdin[2], fdout[2], fderr[2];
5a7a3671 276 int failed_errno = failed_errno;
4919bf03 277
c20181e3
JS
278 /*
279 * In case of errors we must keep the promise to close FDs
280 * that have been passed in via ->in and ->out.
281 */
282
e4507ae8 283 need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03 284 if (need_in) {
c20181e3 285 if (pipe(fdin) < 0) {
0ac77ec3 286 failed_errno = errno;
c20181e3
JS
287 if (cmd->out > 0)
288 close(cmd->out);
0ac77ec3 289 goto fail_pipe;
c20181e3 290 }
4919bf03 291 cmd->in = fdin[1];
4919bf03
SP
292 }
293
e4507ae8
SP
294 need_out = !cmd->no_stdout
295 && !cmd->stdout_to_stderr
296 && cmd->out < 0;
f4bba25b
SP
297 if (need_out) {
298 if (pipe(fdout) < 0) {
0ac77ec3 299 failed_errno = errno;
f4bba25b
SP
300 if (need_in)
301 close_pair(fdin);
c20181e3
JS
302 else if (cmd->in)
303 close(cmd->in);
0ac77ec3 304 goto fail_pipe;
f4bba25b
SP
305 }
306 cmd->out = fdout[0];
f4bba25b
SP
307 }
308
b73a4397 309 need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d
JS
310 if (need_err) {
311 if (pipe(fderr) < 0) {
0ac77ec3 312 failed_errno = errno;
f3b33f1d
JS
313 if (need_in)
314 close_pair(fdin);
c20181e3
JS
315 else if (cmd->in)
316 close(cmd->in);
f3b33f1d
JS
317 if (need_out)
318 close_pair(fdout);
c20181e3
JS
319 else if (cmd->out)
320 close(cmd->out);
0ac77ec3
JS
321fail_pipe:
322 error("cannot create pipe for %s: %s",
323 cmd->argv[0], strerror(failed_errno));
324 errno = failed_errno;
325 return -1;
f3b33f1d
JS
326 }
327 cmd->err = fderr[0];
328 }
329
8852f5d7 330 trace_argv_printf(cmd->argv, "trace: run_command:");
13af8cbd 331 fflush(NULL);
8852f5d7 332
71064e3f 333#ifndef WIN32
2b541bf8
JS
334{
335 int notify_pipe[2];
336 if (pipe(notify_pipe))
337 notify_pipe[0] = notify_pipe[1] = -1;
338
ebcb5d16 339 cmd->pid = fork();
ebcb5d16 340 if (!cmd->pid) {
a5487ddf
JS
341 /*
342 * Redirect the channel to write syscall error messages to
343 * before redirecting the process's stderr so that all die()
344 * in subsequent call paths use the parent's stderr.
345 */
346 if (cmd->no_stderr || need_err) {
347 child_err = dup(2);
348 set_cloexec(child_err);
349 }
350 set_die_routine(die_child);
3bc4181f 351 set_error_routine(error_child);
a5487ddf 352
2b541bf8
JS
353 close(notify_pipe[0]);
354 set_cloexec(notify_pipe[1]);
355 child_notifier = notify_pipe[1];
356 atexit(notify_parent);
357
e4507ae8
SP
358 if (cmd->no_stdin)
359 dup_devnull(0);
360 else if (need_in) {
4919bf03 361 dup2(fdin[0], 0);
9dc09c76 362 close_pair(fdin);
4919bf03
SP
363 } else if (cmd->in) {
364 dup2(cmd->in, 0);
365 close(cmd->in);
95d3c4f5 366 }
4919bf03 367
ce2cf27a
CC
368 if (cmd->no_stderr)
369 dup_devnull(2);
370 else if (need_err) {
371 dup2(fderr[1], 2);
372 close_pair(fderr);
4f41b611
SP
373 } else if (cmd->err > 1) {
374 dup2(cmd->err, 2);
375 close(cmd->err);
ce2cf27a
CC
376 }
377
e4507ae8
SP
378 if (cmd->no_stdout)
379 dup_devnull(1);
380 else if (cmd->stdout_to_stderr)
cd83c74c 381 dup2(2, 1);
f4bba25b
SP
382 else if (need_out) {
383 dup2(fdout[1], 1);
384 close_pair(fdout);
385 } else if (cmd->out > 1) {
386 dup2(cmd->out, 1);
387 close(cmd->out);
388 }
389
1568fea0 390 if (cmd->dir && chdir(cmd->dir))
d824cbba
TR
391 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
392 cmd->dir);
ee493148 393 if (cmd->env) {
3427b375
AR
394 for (; *cmd->env; cmd->env++) {
395 if (strchr(*cmd->env, '='))
4b25d091 396 putenv((char *)*cmd->env);
3427b375
AR
397 else
398 unsetenv(*cmd->env);
399 }
ee493148 400 }
f1000898
SP
401 if (cmd->git_cmd) {
402 execv_git_cmd(cmd->argv);
8dba1e63
JK
403 } else if (cmd->use_shell) {
404 execv_shell_cmd(cmd->argv);
77cb17e9 405 } else {
38f865c2 406 sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
128aed68 407 }
fc1b56f0
CB
408 if (errno == ENOENT) {
409 if (!cmd->silent_exec_failure)
410 error("cannot run %s: %s", cmd->argv[0],
411 strerror(ENOENT));
a5487ddf 412 exit(127);
fc1b56f0 413 } else {
a5487ddf 414 die_errno("cannot exec '%s'", cmd->argv[0]);
fc1b56f0 415 }
b1bf95bb 416 }
0ac77ec3
JS
417 if (cmd->pid < 0)
418 error("cannot fork() for %s: %s", cmd->argv[0],
419 strerror(failed_errno = errno));
afe19ff7
JK
420 else if (cmd->clean_on_exit)
421 mark_child_for_cleanup(cmd->pid);
2b541bf8
JS
422
423 /*
424 * Wait for child's execvp. If the execvp succeeds (or if fork()
425 * failed), EOF is seen immediately by the parent. Otherwise, the
426 * child process sends a single byte.
427 * Note that use of this infrastructure is completely advisory,
428 * therefore, we keep error checks minimal.
429 */
430 close(notify_pipe[1]);
431 if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
432 /*
433 * At this point we know that fork() succeeded, but execvp()
434 * failed. Errors have been reported to our stderr.
435 */
13274526 436 wait_or_whine(cmd->pid, cmd->argv[0]);
2b541bf8
JS
437 failed_errno = errno;
438 cmd->pid = -1;
439 }
440 close(notify_pipe[0]);
afe19ff7 441
2b541bf8 442}
ba26f296 443#else
0d30ad71 444{
75301f90 445 int fhin = 0, fhout = 1, fherr = 2;
108ac313 446 const char **sargv = cmd->argv;
ba26f296 447 char **env = environ;
ba26f296 448
75301f90
JS
449 if (cmd->no_stdin)
450 fhin = open("/dev/null", O_RDWR);
451 else if (need_in)
452 fhin = dup(fdin[0]);
453 else if (cmd->in)
454 fhin = dup(cmd->in);
455
456 if (cmd->no_stderr)
457 fherr = open("/dev/null", O_RDWR);
458 else if (need_err)
459 fherr = dup(fderr[1]);
76d44c8c
JH
460 else if (cmd->err > 2)
461 fherr = dup(cmd->err);
75301f90
JS
462
463 if (cmd->no_stdout)
464 fhout = open("/dev/null", O_RDWR);
465 else if (cmd->stdout_to_stderr)
466 fhout = dup(fherr);
467 else if (need_out)
468 fhout = dup(fdout[1]);
469 else if (cmd->out > 1)
470 fhout = dup(cmd->out);
ba26f296 471
2affea41
JS
472 if (cmd->env)
473 env = make_augmented_environ(cmd->env);
ba26f296
JS
474
475 if (cmd->git_cmd) {
108ac313 476 cmd->argv = prepare_git_cmd(cmd->argv);
8dba1e63
JK
477 } else if (cmd->use_shell) {
478 cmd->argv = prepare_shell_cmd(cmd->argv);
ba26f296
JS
479 }
480
f9a2743c 481 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir,
75301f90 482 fhin, fhout, fherr);
0ac77ec3 483 failed_errno = errno;
c024beb5 484 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
0ac77ec3 485 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
afe19ff7
JK
486 if (cmd->clean_on_exit && cmd->pid >= 0)
487 mark_child_for_cleanup(cmd->pid);
ba26f296
JS
488
489 if (cmd->env)
490 free_environ(env);
491 if (cmd->git_cmd)
108ac313 492 free(cmd->argv);
ba26f296 493
108ac313 494 cmd->argv = sargv;
75301f90
JS
495 if (fhin != 0)
496 close(fhin);
497 if (fhout != 1)
498 close(fhout);
499 if (fherr != 2)
500 close(fherr);
0d30ad71 501}
ba26f296
JS
502#endif
503
504 if (cmd->pid < 0) {
505 if (need_in)
506 close_pair(fdin);
507 else if (cmd->in)
508 close(cmd->in);
509 if (need_out)
510 close_pair(fdout);
511 else if (cmd->out)
512 close(cmd->out);
513 if (need_err)
514 close_pair(fderr);
fc012c28
D
515 else if (cmd->err)
516 close(cmd->err);
0ac77ec3
JS
517 errno = failed_errno;
518 return -1;
ba26f296 519 }
4919bf03
SP
520
521 if (need_in)
522 close(fdin[0]);
523 else if (cmd->in)
524 close(cmd->in);
525
f4bba25b
SP
526 if (need_out)
527 close(fdout[1]);
c20181e3 528 else if (cmd->out)
f4bba25b
SP
529 close(cmd->out);
530
f3b33f1d
JS
531 if (need_err)
532 close(fderr[1]);
4f41b611
SP
533 else if (cmd->err)
534 close(cmd->err);
f3b33f1d 535
ebcb5d16
SP
536 return 0;
537}
538
2d22c208
JS
539int finish_command(struct child_process *cmd)
540{
13274526 541 return wait_or_whine(cmd->pid, cmd->argv[0]);
2d22c208
JS
542}
543
ebcb5d16
SP
544int run_command(struct child_process *cmd)
545{
546 int code = start_command(cmd);
547 if (code)
548 return code;
549 return finish_command(cmd);
550}
551
1568fea0 552static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148
AR
553 const char **argv,
554 int opt)
1568fea0
AR
555{
556 memset(cmd, 0, sizeof(*cmd));
557 cmd->argv = argv;
558 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
559 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
560 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5 561 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
8dba1e63 562 cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
10c6cddd 563 cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
1568fea0
AR
564}
565
f1000898
SP
566int run_command_v_opt(const char **argv, int opt)
567{
568 struct child_process cmd;
1568fea0
AR
569 prepare_run_command_v_opt(&cmd, argv, opt);
570 return run_command(&cmd);
571}
572
ee493148
AR
573int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
574{
575 struct child_process cmd;
576 prepare_run_command_v_opt(&cmd, argv, opt);
577 cmd.dir = dir;
578 cmd.env = env;
579 return run_command(&cmd);
580}
2d22c208 581
f6b60983 582#ifndef NO_PTHREADS
0ea1c89b
JS
583static pthread_t main_thread;
584static int main_thread_set;
585static pthread_key_t async_key;
586
200a76b7 587static void *run_thread(void *data)
618ebe9f
JS
588{
589 struct async *async = data;
f6b60983 590 intptr_t ret;
0ea1c89b
JS
591
592 pthread_setspecific(async_key, async);
f6b60983 593 ret = async->proc(async->proc_in, async->proc_out, async->data);
200a76b7 594 return (void *)ret;
618ebe9f 595}
0ea1c89b
JS
596
597static NORETURN void die_async(const char *err, va_list params)
598{
599 vreportf("fatal: ", err, params);
600
601 if (!pthread_equal(main_thread, pthread_self())) {
602 struct async *async = pthread_getspecific(async_key);
603 if (async->proc_in >= 0)
604 close(async->proc_in);
605 if (async->proc_out >= 0)
606 close(async->proc_out);
607 pthread_exit((void *)128);
608 }
609
610 exit(128);
618ebe9f
JS
611}
612#endif
613
2d22c208
JS
614int start_async(struct async *async)
615{
ae6a5609
EFL
616 int need_in, need_out;
617 int fdin[2], fdout[2];
618 int proc_in, proc_out;
2d22c208 619
ae6a5609
EFL
620 need_in = async->in < 0;
621 if (need_in) {
622 if (pipe(fdin) < 0) {
623 if (async->out > 0)
624 close(async->out);
625 return error("cannot create pipe: %s", strerror(errno));
626 }
627 async->in = fdin[1];
628 }
629
630 need_out = async->out < 0;
631 if (need_out) {
632 if (pipe(fdout) < 0) {
633 if (need_in)
634 close_pair(fdin);
635 else if (async->in)
636 close(async->in);
637 return error("cannot create pipe: %s", strerror(errno));
638 }
639 async->out = fdout[0];
640 }
641
642 if (need_in)
643 proc_in = fdin[0];
644 else if (async->in)
645 proc_in = async->in;
646 else
647 proc_in = -1;
648
649 if (need_out)
650 proc_out = fdout[1];
651 else if (async->out)
652 proc_out = async->out;
653 else
654 proc_out = -1;
2d22c208 655
f6b60983 656#ifdef NO_PTHREADS
2c3766f0
AM
657 /* Flush stdio before fork() to avoid cloning buffers */
658 fflush(NULL);
659
2d22c208
JS
660 async->pid = fork();
661 if (async->pid < 0) {
662 error("fork (async) failed: %s", strerror(errno));
ae6a5609 663 goto error;
2d22c208
JS
664 }
665 if (!async->pid) {
ae6a5609
EFL
666 if (need_in)
667 close(fdin[1]);
668 if (need_out)
669 close(fdout[0]);
670 exit(!!async->proc(proc_in, proc_out, async->data));
2d22c208 671 }
ae6a5609 672
afe19ff7
JK
673 mark_child_for_cleanup(async->pid);
674
ae6a5609
EFL
675 if (need_in)
676 close(fdin[0]);
677 else if (async->in)
678 close(async->in);
679
680 if (need_out)
681 close(fdout[1]);
682 else if (async->out)
683 close(async->out);
618ebe9f 684#else
0ea1c89b
JS
685 if (!main_thread_set) {
686 /*
687 * We assume that the first time that start_async is called
688 * it is from the main thread.
689 */
690 main_thread_set = 1;
691 main_thread = pthread_self();
692 pthread_key_create(&async_key, NULL);
693 set_die_routine(die_async);
694 }
695
200a76b7
JS
696 if (proc_in >= 0)
697 set_cloexec(proc_in);
698 if (proc_out >= 0)
699 set_cloexec(proc_out);
ae6a5609
EFL
700 async->proc_in = proc_in;
701 async->proc_out = proc_out;
200a76b7
JS
702 {
703 int err = pthread_create(&async->tid, NULL, run_thread, async);
704 if (err) {
705 error("cannot create thread: %s", strerror(err));
706 goto error;
707 }
618ebe9f
JS
708 }
709#endif
2d22c208 710 return 0;
ae6a5609
EFL
711
712error:
713 if (need_in)
714 close_pair(fdin);
715 else if (async->in)
716 close(async->in);
717
718 if (need_out)
719 close_pair(fdout);
720 else if (async->out)
721 close(async->out);
722 return -1;
2d22c208
JS
723}
724
725int finish_async(struct async *async)
726{
f6b60983 727#ifdef NO_PTHREADS
0398fc34 728 return wait_or_whine(async->pid, "child process");
618ebe9f 729#else
200a76b7
JS
730 void *ret = (void *)(intptr_t)(-1);
731
732 if (pthread_join(async->tid, &ret))
733 error("pthread_join failed");
734 return (int)(intptr_t)ret;
618ebe9f 735#endif
2d22c208 736}
ae98a008
SB
737
738int run_hook(const char *index_file, const char *name, ...)
739{
740 struct child_process hook;
5d40a179
JK
741 struct argv_array argv = ARGV_ARRAY_INIT;
742 const char *p, *env[2];
ae98a008
SB
743 char index[PATH_MAX];
744 va_list args;
745 int ret;
ae98a008 746
cf94ca8e
SB
747 if (access(git_path("hooks/%s", name), X_OK) < 0)
748 return 0;
749
ae98a008 750 va_start(args, name);
5d40a179
JK
751 argv_array_push(&argv, git_path("hooks/%s", name));
752 while ((p = va_arg(args, const char *)))
753 argv_array_push(&argv, p);
ae98a008
SB
754 va_end(args);
755
ae98a008 756 memset(&hook, 0, sizeof(hook));
5d40a179 757 hook.argv = argv.argv;
ae98a008
SB
758 hook.no_stdin = 1;
759 hook.stdout_to_stderr = 1;
760 if (index_file) {
761 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
762 env[0] = index;
763 env[1] = NULL;
764 hook.env = env;
765 }
766
0ac77ec3 767 ret = run_command(&hook);
5d40a179 768 argv_array_clear(&argv);
ae98a008
SB
769 return ret;
770}