run-command: use internal argv_array of struct child_process in run_hook_ve()
[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
380395d0 75#ifndef GIT_WINDOWS_NATIVE
e4507ae8
SP
76static inline void dup_devnull(int to)
77{
78 int fd = open("/dev/null", O_RDWR);
a77f106c
TR
79 if (fd < 0)
80 die_errno(_("open /dev/null failed"));
81 if (dup2(fd, to) < 0)
82 die_errno(_("dup2(%d,%d) failed"), fd, to);
e4507ae8
SP
83 close(fd);
84}
75301f90 85#endif
e4507ae8 86
38f865c2
JK
87static char *locate_in_PATH(const char *file)
88{
89 const char *p = getenv("PATH");
90 struct strbuf buf = STRBUF_INIT;
91
92 if (!p || !*p)
93 return NULL;
94
95 while (1) {
96 const char *end = strchrnul(p, ':');
97
98 strbuf_reset(&buf);
99
100 /* POSIX specifies an empty entry as the current directory. */
101 if (end != p) {
102 strbuf_add(&buf, p, end - p);
103 strbuf_addch(&buf, '/');
104 }
105 strbuf_addstr(&buf, file);
106
107 if (!access(buf.buf, F_OK))
108 return strbuf_detach(&buf, NULL);
109
110 if (!*end)
111 break;
112 p = end + 1;
113 }
114
115 strbuf_release(&buf);
116 return NULL;
117}
118
119static int exists_in_PATH(const char *file)
120{
121 char *r = locate_in_PATH(file);
122 free(r);
123 return r != NULL;
124}
125
126int sane_execvp(const char *file, char * const argv[])
127{
128 if (!execvp(file, argv))
129 return 0; /* cannot happen ;-) */
130
131 /*
132 * When a command can't be found because one of the directories
133 * listed in $PATH is unsearchable, execvp reports EACCES, but
134 * careful usability testing (read: analysis of occasional bug
135 * reports) reveals that "No such file or directory" is more
136 * intuitive.
137 *
138 * We avoid commands with "/", because execvp will not do $PATH
139 * lookups in that case.
140 *
141 * The reassignment of EACCES to errno looks like a no-op below,
142 * but we need to protect against exists_in_PATH overwriting errno.
143 */
144 if (errno == EACCES && !strchr(file, '/'))
145 errno = exists_in_PATH(file) ? EACCES : ENOENT;
a7855083
JH
146 else if (errno == ENOTDIR && !strchr(file, '/'))
147 errno = ENOENT;
38f865c2
JK
148 return -1;
149}
150
8dba1e63
JK
151static const char **prepare_shell_cmd(const char **argv)
152{
153 int argc, nargc = 0;
154 const char **nargv;
155
156 for (argc = 0; argv[argc]; argc++)
157 ; /* just counting */
158 /* +1 for NULL, +3 for "sh -c" plus extra $0 */
159 nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
160
161 if (argc < 1)
162 die("BUG: shell command is empty");
163
f445644f 164 if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
380395d0 165#ifndef GIT_WINDOWS_NATIVE
b3e34ddd 166 nargv[nargc++] = SHELL_PATH;
77629754
JS
167#else
168 nargv[nargc++] = "sh";
169#endif
f445644f 170 nargv[nargc++] = "-c";
8dba1e63 171
f445644f
JK
172 if (argc < 2)
173 nargv[nargc++] = argv[0];
174 else {
175 struct strbuf arg0 = STRBUF_INIT;
176 strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
177 nargv[nargc++] = strbuf_detach(&arg0, NULL);
178 }
8dba1e63
JK
179 }
180
181 for (argc = 0; argv[argc]; argc++)
182 nargv[nargc++] = argv[argc];
183 nargv[nargc] = NULL;
184
185 return nargv;
186}
187
380395d0 188#ifndef GIT_WINDOWS_NATIVE
8dba1e63
JK
189static int execv_shell_cmd(const char **argv)
190{
191 const char **nargv = prepare_shell_cmd(argv);
192 trace_argv_printf(nargv, "trace: exec:");
38f865c2 193 sane_execvp(nargv[0], (char **)nargv);
8dba1e63
JK
194 free(nargv);
195 return -1;
196}
197#endif
198
380395d0 199#ifndef GIT_WINDOWS_NATIVE
a5487ddf 200static int child_err = 2;
2b541bf8
JS
201static int child_notifier = -1;
202
203static void notify_parent(void)
204{
a111eb78
JN
205 /*
206 * execvp failed. If possible, we'd like to let start_command
207 * know, so failures like ENOENT can be handled right away; but
208 * otherwise, finish_command will still report the error.
209 */
210 xwrite(child_notifier, "", 1);
2b541bf8 211}
a5487ddf
JS
212
213static NORETURN void die_child(const char *err, va_list params)
214{
3bc4181f 215 vwritef(child_err, "fatal: ", err, params);
a5487ddf
JS
216 exit(128);
217}
3bc4181f
CB
218
219static void error_child(const char *err, va_list params)
220{
221 vwritef(child_err, "error: ", err, params);
222}
200a76b7 223#endif
a5487ddf
JS
224
225static inline void set_cloexec(int fd)
226{
227 int flags = fcntl(fd, F_GETFD);
228 if (flags >= 0)
229 fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
230}
a5487ddf 231
13274526 232static int wait_or_whine(pid_t pid, const char *argv0)
ab0b41da
JS
233{
234 int status, code = -1;
235 pid_t waiting;
236 int failed_errno = 0;
237
238 while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
239 ; /* nothing */
240
241 if (waiting < 0) {
242 failed_errno = errno;
243 error("waitpid for %s failed: %s", argv0, strerror(errno));
244 } else if (waiting != pid) {
245 error("waitpid is confused (%s)", argv0);
246 } else if (WIFSIGNALED(status)) {
247 code = WTERMSIG(status);
a2767c5c
JK
248 if (code != SIGINT && code != SIGQUIT)
249 error("%s died of signal %d", argv0, code);
ab0b41da
JS
250 /*
251 * This return value is chosen so that code & 0xff
252 * mimics the exit code that a POSIX shell would report for
253 * a program that died from this signal.
254 */
709ca730 255 code += 128;
ab0b41da
JS
256 } else if (WIFEXITED(status)) {
257 code = WEXITSTATUS(status);
258 /*
259 * Convert special exit code when execvp failed.
260 */
261 if (code == 127) {
262 code = -1;
263 failed_errno = ENOENT;
ab0b41da
JS
264 }
265 } else {
266 error("waitpid is confused (%s)", argv0);
267 }
afe19ff7
JK
268
269 clear_child_for_cleanup(pid);
270
ab0b41da
JS
271 errno = failed_errno;
272 return code;
273}
274
ebcb5d16 275int start_command(struct child_process *cmd)
b1bf95bb 276{
f3b33f1d
JS
277 int need_in, need_out, need_err;
278 int fdin[2], fdout[2], fderr[2];
25043d8a 279 int failed_errno;
939296c4 280 char *str;
4919bf03 281
c460c0ec
JK
282 if (!cmd->argv)
283 cmd->argv = cmd->args.argv;
284
c20181e3
JS
285 /*
286 * In case of errors we must keep the promise to close FDs
287 * that have been passed in via ->in and ->out.
288 */
289
e4507ae8 290 need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03 291 if (need_in) {
c20181e3 292 if (pipe(fdin) < 0) {
0ac77ec3 293 failed_errno = errno;
c20181e3
JS
294 if (cmd->out > 0)
295 close(cmd->out);
939296c4 296 str = "standard input";
0ac77ec3 297 goto fail_pipe;
c20181e3 298 }
4919bf03 299 cmd->in = fdin[1];
4919bf03
SP
300 }
301
e4507ae8
SP
302 need_out = !cmd->no_stdout
303 && !cmd->stdout_to_stderr
304 && cmd->out < 0;
f4bba25b
SP
305 if (need_out) {
306 if (pipe(fdout) < 0) {
0ac77ec3 307 failed_errno = errno;
f4bba25b
SP
308 if (need_in)
309 close_pair(fdin);
c20181e3
JS
310 else if (cmd->in)
311 close(cmd->in);
939296c4 312 str = "standard output";
0ac77ec3 313 goto fail_pipe;
f4bba25b
SP
314 }
315 cmd->out = fdout[0];
f4bba25b
SP
316 }
317
b73a4397 318 need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d
JS
319 if (need_err) {
320 if (pipe(fderr) < 0) {
0ac77ec3 321 failed_errno = errno;
f3b33f1d
JS
322 if (need_in)
323 close_pair(fdin);
c20181e3
JS
324 else if (cmd->in)
325 close(cmd->in);
f3b33f1d
JS
326 if (need_out)
327 close_pair(fdout);
c20181e3
JS
328 else if (cmd->out)
329 close(cmd->out);
939296c4 330 str = "standard error";
0ac77ec3 331fail_pipe:
939296c4
SB
332 error("cannot create %s pipe for %s: %s",
333 str, cmd->argv[0], strerror(failed_errno));
c460c0ec 334 argv_array_clear(&cmd->args);
0ac77ec3
JS
335 errno = failed_errno;
336 return -1;
f3b33f1d
JS
337 }
338 cmd->err = fderr[0];
339 }
340
8852f5d7 341 trace_argv_printf(cmd->argv, "trace: run_command:");
13af8cbd 342 fflush(NULL);
8852f5d7 343
380395d0 344#ifndef GIT_WINDOWS_NATIVE
2b541bf8
JS
345{
346 int notify_pipe[2];
347 if (pipe(notify_pipe))
348 notify_pipe[0] = notify_pipe[1] = -1;
349
ebcb5d16 350 cmd->pid = fork();
25043d8a 351 failed_errno = errno;
ebcb5d16 352 if (!cmd->pid) {
a5487ddf
JS
353 /*
354 * Redirect the channel to write syscall error messages to
355 * before redirecting the process's stderr so that all die()
356 * in subsequent call paths use the parent's stderr.
357 */
358 if (cmd->no_stderr || need_err) {
359 child_err = dup(2);
360 set_cloexec(child_err);
361 }
362 set_die_routine(die_child);
3bc4181f 363 set_error_routine(error_child);
a5487ddf 364
2b541bf8
JS
365 close(notify_pipe[0]);
366 set_cloexec(notify_pipe[1]);
367 child_notifier = notify_pipe[1];
368 atexit(notify_parent);
369
e4507ae8
SP
370 if (cmd->no_stdin)
371 dup_devnull(0);
372 else if (need_in) {
4919bf03 373 dup2(fdin[0], 0);
9dc09c76 374 close_pair(fdin);
4919bf03
SP
375 } else if (cmd->in) {
376 dup2(cmd->in, 0);
377 close(cmd->in);
95d3c4f5 378 }
4919bf03 379
ce2cf27a
CC
380 if (cmd->no_stderr)
381 dup_devnull(2);
382 else if (need_err) {
383 dup2(fderr[1], 2);
384 close_pair(fderr);
4f41b611
SP
385 } else if (cmd->err > 1) {
386 dup2(cmd->err, 2);
387 close(cmd->err);
ce2cf27a
CC
388 }
389
e4507ae8
SP
390 if (cmd->no_stdout)
391 dup_devnull(1);
392 else if (cmd->stdout_to_stderr)
cd83c74c 393 dup2(2, 1);
f4bba25b
SP
394 else if (need_out) {
395 dup2(fdout[1], 1);
396 close_pair(fdout);
397 } else if (cmd->out > 1) {
398 dup2(cmd->out, 1);
399 close(cmd->out);
400 }
401
1568fea0 402 if (cmd->dir && chdir(cmd->dir))
d824cbba
TR
403 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
404 cmd->dir);
ee493148 405 if (cmd->env) {
3427b375
AR
406 for (; *cmd->env; cmd->env++) {
407 if (strchr(*cmd->env, '='))
4b25d091 408 putenv((char *)*cmd->env);
3427b375
AR
409 else
410 unsetenv(*cmd->env);
411 }
ee493148 412 }
5a50085c 413 if (cmd->git_cmd)
f1000898 414 execv_git_cmd(cmd->argv);
5a50085c 415 else if (cmd->use_shell)
8dba1e63 416 execv_shell_cmd(cmd->argv);
5a50085c 417 else
38f865c2 418 sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
fc1b56f0
CB
419 if (errno == ENOENT) {
420 if (!cmd->silent_exec_failure)
421 error("cannot run %s: %s", cmd->argv[0],
422 strerror(ENOENT));
a5487ddf 423 exit(127);
fc1b56f0 424 } else {
a5487ddf 425 die_errno("cannot exec '%s'", cmd->argv[0]);
fc1b56f0 426 }
b1bf95bb 427 }
0ac77ec3
JS
428 if (cmd->pid < 0)
429 error("cannot fork() for %s: %s", cmd->argv[0],
25043d8a 430 strerror(errno));
afe19ff7
JK
431 else if (cmd->clean_on_exit)
432 mark_child_for_cleanup(cmd->pid);
2b541bf8
JS
433
434 /*
435 * Wait for child's execvp. If the execvp succeeds (or if fork()
436 * failed), EOF is seen immediately by the parent. Otherwise, the
437 * child process sends a single byte.
438 * Note that use of this infrastructure is completely advisory,
439 * therefore, we keep error checks minimal.
440 */
441 close(notify_pipe[1]);
442 if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
443 /*
444 * At this point we know that fork() succeeded, but execvp()
445 * failed. Errors have been reported to our stderr.
446 */
13274526 447 wait_or_whine(cmd->pid, cmd->argv[0]);
2b541bf8
JS
448 failed_errno = errno;
449 cmd->pid = -1;
450 }
451 close(notify_pipe[0]);
452}
ba26f296 453#else
0d30ad71 454{
75301f90 455 int fhin = 0, fhout = 1, fherr = 2;
108ac313 456 const char **sargv = cmd->argv;
ba26f296 457 char **env = environ;
ba26f296 458
75301f90
JS
459 if (cmd->no_stdin)
460 fhin = open("/dev/null", O_RDWR);
461 else if (need_in)
462 fhin = dup(fdin[0]);
463 else if (cmd->in)
464 fhin = dup(cmd->in);
465
466 if (cmd->no_stderr)
467 fherr = open("/dev/null", O_RDWR);
468 else if (need_err)
469 fherr = dup(fderr[1]);
76d44c8c
JH
470 else if (cmd->err > 2)
471 fherr = dup(cmd->err);
75301f90
JS
472
473 if (cmd->no_stdout)
474 fhout = open("/dev/null", O_RDWR);
475 else if (cmd->stdout_to_stderr)
476 fhout = dup(fherr);
477 else if (need_out)
478 fhout = dup(fdout[1]);
479 else if (cmd->out > 1)
480 fhout = dup(cmd->out);
ba26f296 481
2affea41
JS
482 if (cmd->env)
483 env = make_augmented_environ(cmd->env);
ba26f296 484
5a50085c 485 if (cmd->git_cmd)
108ac313 486 cmd->argv = prepare_git_cmd(cmd->argv);
5a50085c 487 else if (cmd->use_shell)
8dba1e63 488 cmd->argv = prepare_shell_cmd(cmd->argv);
ba26f296 489
f9a2743c 490 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir,
75301f90 491 fhin, fhout, fherr);
0ac77ec3 492 failed_errno = errno;
c024beb5 493 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
0ac77ec3 494 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
afe19ff7
JK
495 if (cmd->clean_on_exit && cmd->pid >= 0)
496 mark_child_for_cleanup(cmd->pid);
ba26f296
JS
497
498 if (cmd->env)
499 free_environ(env);
500 if (cmd->git_cmd)
108ac313 501 free(cmd->argv);
ba26f296 502
108ac313 503 cmd->argv = sargv;
75301f90
JS
504 if (fhin != 0)
505 close(fhin);
506 if (fhout != 1)
507 close(fhout);
508 if (fherr != 2)
509 close(fherr);
0d30ad71 510}
ba26f296
JS
511#endif
512
513 if (cmd->pid < 0) {
514 if (need_in)
515 close_pair(fdin);
516 else if (cmd->in)
517 close(cmd->in);
518 if (need_out)
519 close_pair(fdout);
520 else if (cmd->out)
521 close(cmd->out);
522 if (need_err)
523 close_pair(fderr);
fc012c28
D
524 else if (cmd->err)
525 close(cmd->err);
c460c0ec 526 argv_array_clear(&cmd->args);
0ac77ec3
JS
527 errno = failed_errno;
528 return -1;
ba26f296 529 }
4919bf03
SP
530
531 if (need_in)
532 close(fdin[0]);
533 else if (cmd->in)
534 close(cmd->in);
535
f4bba25b
SP
536 if (need_out)
537 close(fdout[1]);
c20181e3 538 else if (cmd->out)
f4bba25b
SP
539 close(cmd->out);
540
f3b33f1d
JS
541 if (need_err)
542 close(fderr[1]);
4f41b611
SP
543 else if (cmd->err)
544 close(cmd->err);
f3b33f1d 545
ebcb5d16
SP
546 return 0;
547}
548
2d22c208
JS
549int finish_command(struct child_process *cmd)
550{
c460c0ec
JK
551 int ret = wait_or_whine(cmd->pid, cmd->argv[0]);
552 argv_array_clear(&cmd->args);
553 return ret;
2d22c208
JS
554}
555
ebcb5d16
SP
556int run_command(struct child_process *cmd)
557{
558 int code = start_command(cmd);
559 if (code)
560 return code;
561 return finish_command(cmd);
562}
563
1568fea0 564static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148
AR
565 const char **argv,
566 int opt)
1568fea0
AR
567{
568 memset(cmd, 0, sizeof(*cmd));
569 cmd->argv = argv;
570 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
571 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
572 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5 573 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
8dba1e63 574 cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
10c6cddd 575 cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
1568fea0
AR
576}
577
f1000898
SP
578int run_command_v_opt(const char **argv, int opt)
579{
580 struct child_process cmd;
1568fea0
AR
581 prepare_run_command_v_opt(&cmd, argv, opt);
582 return run_command(&cmd);
583}
584
ee493148
AR
585int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
586{
587 struct child_process cmd;
588 prepare_run_command_v_opt(&cmd, argv, opt);
589 cmd.dir = dir;
590 cmd.env = env;
591 return run_command(&cmd);
592}
2d22c208 593
f6b60983 594#ifndef NO_PTHREADS
0ea1c89b
JS
595static pthread_t main_thread;
596static int main_thread_set;
597static pthread_key_t async_key;
1ece66bc 598static pthread_key_t async_die_counter;
0ea1c89b 599
200a76b7 600static void *run_thread(void *data)
618ebe9f
JS
601{
602 struct async *async = data;
f6b60983 603 intptr_t ret;
0ea1c89b
JS
604
605 pthread_setspecific(async_key, async);
f6b60983 606 ret = async->proc(async->proc_in, async->proc_out, async->data);
200a76b7 607 return (void *)ret;
618ebe9f 608}
0ea1c89b
JS
609
610static NORETURN void die_async(const char *err, va_list params)
611{
612 vreportf("fatal: ", err, params);
613
614 if (!pthread_equal(main_thread, pthread_self())) {
615 struct async *async = pthread_getspecific(async_key);
616 if (async->proc_in >= 0)
617 close(async->proc_in);
618 if (async->proc_out >= 0)
619 close(async->proc_out);
620 pthread_exit((void *)128);
621 }
622
623 exit(128);
618ebe9f 624}
1ece66bc
JK
625
626static int async_die_is_recursing(void)
627{
628 void *ret = pthread_getspecific(async_die_counter);
629 pthread_setspecific(async_die_counter, (void *)1);
630 return ret != NULL;
631}
632
618ebe9f
JS
633#endif
634
2d22c208
JS
635int start_async(struct async *async)
636{
ae6a5609
EFL
637 int need_in, need_out;
638 int fdin[2], fdout[2];
639 int proc_in, proc_out;
2d22c208 640
ae6a5609
EFL
641 need_in = async->in < 0;
642 if (need_in) {
643 if (pipe(fdin) < 0) {
644 if (async->out > 0)
645 close(async->out);
646 return error("cannot create pipe: %s", strerror(errno));
647 }
648 async->in = fdin[1];
649 }
650
651 need_out = async->out < 0;
652 if (need_out) {
653 if (pipe(fdout) < 0) {
654 if (need_in)
655 close_pair(fdin);
656 else if (async->in)
657 close(async->in);
658 return error("cannot create pipe: %s", strerror(errno));
659 }
660 async->out = fdout[0];
661 }
662
663 if (need_in)
664 proc_in = fdin[0];
665 else if (async->in)
666 proc_in = async->in;
667 else
668 proc_in = -1;
669
670 if (need_out)
671 proc_out = fdout[1];
672 else if (async->out)
673 proc_out = async->out;
674 else
675 proc_out = -1;
2d22c208 676
f6b60983 677#ifdef NO_PTHREADS
2c3766f0
AM
678 /* Flush stdio before fork() to avoid cloning buffers */
679 fflush(NULL);
680
2d22c208
JS
681 async->pid = fork();
682 if (async->pid < 0) {
683 error("fork (async) failed: %s", strerror(errno));
ae6a5609 684 goto error;
2d22c208
JS
685 }
686 if (!async->pid) {
ae6a5609
EFL
687 if (need_in)
688 close(fdin[1]);
689 if (need_out)
690 close(fdout[0]);
691 exit(!!async->proc(proc_in, proc_out, async->data));
2d22c208 692 }
ae6a5609 693
afe19ff7
JK
694 mark_child_for_cleanup(async->pid);
695
ae6a5609
EFL
696 if (need_in)
697 close(fdin[0]);
698 else if (async->in)
699 close(async->in);
700
701 if (need_out)
702 close(fdout[1]);
703 else if (async->out)
704 close(async->out);
618ebe9f 705#else
0ea1c89b
JS
706 if (!main_thread_set) {
707 /*
708 * We assume that the first time that start_async is called
709 * it is from the main thread.
710 */
711 main_thread_set = 1;
712 main_thread = pthread_self();
713 pthread_key_create(&async_key, NULL);
1ece66bc 714 pthread_key_create(&async_die_counter, NULL);
0ea1c89b 715 set_die_routine(die_async);
1ece66bc 716 set_die_is_recursing_routine(async_die_is_recursing);
0ea1c89b
JS
717 }
718
200a76b7
JS
719 if (proc_in >= 0)
720 set_cloexec(proc_in);
721 if (proc_out >= 0)
722 set_cloexec(proc_out);
ae6a5609
EFL
723 async->proc_in = proc_in;
724 async->proc_out = proc_out;
200a76b7
JS
725 {
726 int err = pthread_create(&async->tid, NULL, run_thread, async);
727 if (err) {
728 error("cannot create thread: %s", strerror(err));
729 goto error;
730 }
618ebe9f
JS
731 }
732#endif
2d22c208 733 return 0;
ae6a5609
EFL
734
735error:
736 if (need_in)
737 close_pair(fdin);
738 else if (async->in)
739 close(async->in);
740
741 if (need_out)
742 close_pair(fdout);
743 else if (async->out)
744 close(async->out);
745 return -1;
2d22c208
JS
746}
747
748int finish_async(struct async *async)
749{
f6b60983 750#ifdef NO_PTHREADS
0398fc34 751 return wait_or_whine(async->pid, "child process");
618ebe9f 752#else
200a76b7
JS
753 void *ret = (void *)(intptr_t)(-1);
754
755 if (pthread_join(async->tid, &ret))
756 error("pthread_join failed");
757 return (int)(intptr_t)ret;
618ebe9f 758#endif
2d22c208 759}
ae98a008 760
5a7da2dc
AS
761char *find_hook(const char *name)
762{
763 char *path = git_path("hooks/%s", name);
764 if (access(path, X_OK) < 0)
765 path = NULL;
766
767 return path;
768}
769
15048f8a 770int run_hook_ve(const char *const *env, const char *name, va_list args)
ae98a008
SB
771{
772 struct child_process hook;
15048f8a 773 const char *p;
ae98a008 774
5a7da2dc
AS
775 p = find_hook(name);
776 if (!p)
cf94ca8e
SB
777 return 0;
778
ae98a008 779 memset(&hook, 0, sizeof(hook));
d1d09456
RS
780 argv_array_push(&hook.args, p);
781 while ((p = va_arg(args, const char *)))
782 argv_array_push(&hook.args, p);
15048f8a 783 hook.env = env;
ae98a008
SB
784 hook.no_stdin = 1;
785 hook.stdout_to_stderr = 1;
ae98a008 786
d1d09456 787 return run_command(&hook);
ae98a008 788}
15048f8a
BP
789
790int run_hook_le(const char *const *env, const char *name, ...)
791{
792 va_list args;
793 int ret;
794
795 va_start(args, name);
796 ret = run_hook_ve(env, name, args);
797 va_end(args);
798
799 return ret;
800}
801
802int run_hook_with_custom_index(const char *index_file, const char *name, ...)
803{
804 const char *hook_env[3] = { NULL };
805 char index[PATH_MAX];
806 va_list args;
807 int ret;
808
809 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
810 hook_env[0] = index;
811
812 va_start(args, name);
813 ret = run_hook_ve(hook_env, name, args);
814 va_end(args);
815
816 return ret;
817}