Merge branch 'tr/fd-gotcha-fixes'
[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
c20181e3
JS
282 /*
283 * In case of errors we must keep the promise to close FDs
284 * that have been passed in via ->in and ->out.
285 */
286
e4507ae8 287 need_in = !cmd->no_stdin && cmd->in < 0;
4919bf03 288 if (need_in) {
c20181e3 289 if (pipe(fdin) < 0) {
0ac77ec3 290 failed_errno = errno;
c20181e3
JS
291 if (cmd->out > 0)
292 close(cmd->out);
939296c4 293 str = "standard input";
0ac77ec3 294 goto fail_pipe;
c20181e3 295 }
4919bf03 296 cmd->in = fdin[1];
4919bf03
SP
297 }
298
e4507ae8
SP
299 need_out = !cmd->no_stdout
300 && !cmd->stdout_to_stderr
301 && cmd->out < 0;
f4bba25b
SP
302 if (need_out) {
303 if (pipe(fdout) < 0) {
0ac77ec3 304 failed_errno = errno;
f4bba25b
SP
305 if (need_in)
306 close_pair(fdin);
c20181e3
JS
307 else if (cmd->in)
308 close(cmd->in);
939296c4 309 str = "standard output";
0ac77ec3 310 goto fail_pipe;
f4bba25b
SP
311 }
312 cmd->out = fdout[0];
f4bba25b
SP
313 }
314
b73a4397 315 need_err = !cmd->no_stderr && cmd->err < 0;
f3b33f1d
JS
316 if (need_err) {
317 if (pipe(fderr) < 0) {
0ac77ec3 318 failed_errno = errno;
f3b33f1d
JS
319 if (need_in)
320 close_pair(fdin);
c20181e3
JS
321 else if (cmd->in)
322 close(cmd->in);
f3b33f1d
JS
323 if (need_out)
324 close_pair(fdout);
c20181e3
JS
325 else if (cmd->out)
326 close(cmd->out);
939296c4 327 str = "standard error";
0ac77ec3 328fail_pipe:
939296c4
SB
329 error("cannot create %s pipe for %s: %s",
330 str, cmd->argv[0], strerror(failed_errno));
0ac77ec3
JS
331 errno = failed_errno;
332 return -1;
f3b33f1d
JS
333 }
334 cmd->err = fderr[0];
335 }
336
8852f5d7 337 trace_argv_printf(cmd->argv, "trace: run_command:");
13af8cbd 338 fflush(NULL);
8852f5d7 339
380395d0 340#ifndef GIT_WINDOWS_NATIVE
2b541bf8
JS
341{
342 int notify_pipe[2];
343 if (pipe(notify_pipe))
344 notify_pipe[0] = notify_pipe[1] = -1;
345
ebcb5d16 346 cmd->pid = fork();
25043d8a 347 failed_errno = errno;
ebcb5d16 348 if (!cmd->pid) {
a5487ddf
JS
349 /*
350 * Redirect the channel to write syscall error messages to
351 * before redirecting the process's stderr so that all die()
352 * in subsequent call paths use the parent's stderr.
353 */
354 if (cmd->no_stderr || need_err) {
355 child_err = dup(2);
356 set_cloexec(child_err);
357 }
358 set_die_routine(die_child);
3bc4181f 359 set_error_routine(error_child);
a5487ddf 360
2b541bf8
JS
361 close(notify_pipe[0]);
362 set_cloexec(notify_pipe[1]);
363 child_notifier = notify_pipe[1];
364 atexit(notify_parent);
365
e4507ae8
SP
366 if (cmd->no_stdin)
367 dup_devnull(0);
368 else if (need_in) {
4919bf03 369 dup2(fdin[0], 0);
9dc09c76 370 close_pair(fdin);
4919bf03
SP
371 } else if (cmd->in) {
372 dup2(cmd->in, 0);
373 close(cmd->in);
95d3c4f5 374 }
4919bf03 375
ce2cf27a
CC
376 if (cmd->no_stderr)
377 dup_devnull(2);
378 else if (need_err) {
379 dup2(fderr[1], 2);
380 close_pair(fderr);
4f41b611
SP
381 } else if (cmd->err > 1) {
382 dup2(cmd->err, 2);
383 close(cmd->err);
ce2cf27a
CC
384 }
385
e4507ae8
SP
386 if (cmd->no_stdout)
387 dup_devnull(1);
388 else if (cmd->stdout_to_stderr)
cd83c74c 389 dup2(2, 1);
f4bba25b
SP
390 else if (need_out) {
391 dup2(fdout[1], 1);
392 close_pair(fdout);
393 } else if (cmd->out > 1) {
394 dup2(cmd->out, 1);
395 close(cmd->out);
396 }
397
1568fea0 398 if (cmd->dir && chdir(cmd->dir))
d824cbba
TR
399 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
400 cmd->dir);
ee493148 401 if (cmd->env) {
3427b375
AR
402 for (; *cmd->env; cmd->env++) {
403 if (strchr(*cmd->env, '='))
4b25d091 404 putenv((char *)*cmd->env);
3427b375
AR
405 else
406 unsetenv(*cmd->env);
407 }
ee493148 408 }
f1000898
SP
409 if (cmd->git_cmd) {
410 execv_git_cmd(cmd->argv);
8dba1e63
JK
411 } else if (cmd->use_shell) {
412 execv_shell_cmd(cmd->argv);
77cb17e9 413 } else {
38f865c2 414 sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
128aed68 415 }
fc1b56f0
CB
416 if (errno == ENOENT) {
417 if (!cmd->silent_exec_failure)
418 error("cannot run %s: %s", cmd->argv[0],
419 strerror(ENOENT));
a5487ddf 420 exit(127);
fc1b56f0 421 } else {
a5487ddf 422 die_errno("cannot exec '%s'", cmd->argv[0]);
fc1b56f0 423 }
b1bf95bb 424 }
0ac77ec3
JS
425 if (cmd->pid < 0)
426 error("cannot fork() for %s: %s", cmd->argv[0],
25043d8a 427 strerror(errno));
afe19ff7
JK
428 else if (cmd->clean_on_exit)
429 mark_child_for_cleanup(cmd->pid);
2b541bf8
JS
430
431 /*
432 * Wait for child's execvp. If the execvp succeeds (or if fork()
433 * failed), EOF is seen immediately by the parent. Otherwise, the
434 * child process sends a single byte.
435 * Note that use of this infrastructure is completely advisory,
436 * therefore, we keep error checks minimal.
437 */
438 close(notify_pipe[1]);
439 if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
440 /*
441 * At this point we know that fork() succeeded, but execvp()
442 * failed. Errors have been reported to our stderr.
443 */
13274526 444 wait_or_whine(cmd->pid, cmd->argv[0]);
2b541bf8
JS
445 failed_errno = errno;
446 cmd->pid = -1;
447 }
448 close(notify_pipe[0]);
afe19ff7 449
2b541bf8 450}
ba26f296 451#else
0d30ad71 452{
75301f90 453 int fhin = 0, fhout = 1, fherr = 2;
108ac313 454 const char **sargv = cmd->argv;
ba26f296 455 char **env = environ;
ba26f296 456
75301f90
JS
457 if (cmd->no_stdin)
458 fhin = open("/dev/null", O_RDWR);
459 else if (need_in)
460 fhin = dup(fdin[0]);
461 else if (cmd->in)
462 fhin = dup(cmd->in);
463
464 if (cmd->no_stderr)
465 fherr = open("/dev/null", O_RDWR);
466 else if (need_err)
467 fherr = dup(fderr[1]);
76d44c8c
JH
468 else if (cmd->err > 2)
469 fherr = dup(cmd->err);
75301f90
JS
470
471 if (cmd->no_stdout)
472 fhout = open("/dev/null", O_RDWR);
473 else if (cmd->stdout_to_stderr)
474 fhout = dup(fherr);
475 else if (need_out)
476 fhout = dup(fdout[1]);
477 else if (cmd->out > 1)
478 fhout = dup(cmd->out);
ba26f296 479
2affea41
JS
480 if (cmd->env)
481 env = make_augmented_environ(cmd->env);
ba26f296
JS
482
483 if (cmd->git_cmd) {
108ac313 484 cmd->argv = prepare_git_cmd(cmd->argv);
8dba1e63
JK
485 } else if (cmd->use_shell) {
486 cmd->argv = prepare_shell_cmd(cmd->argv);
ba26f296
JS
487 }
488
f9a2743c 489 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir,
75301f90 490 fhin, fhout, fherr);
0ac77ec3 491 failed_errno = errno;
c024beb5 492 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
0ac77ec3 493 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
afe19ff7
JK
494 if (cmd->clean_on_exit && cmd->pid >= 0)
495 mark_child_for_cleanup(cmd->pid);
ba26f296
JS
496
497 if (cmd->env)
498 free_environ(env);
499 if (cmd->git_cmd)
108ac313 500 free(cmd->argv);
ba26f296 501
108ac313 502 cmd->argv = sargv;
75301f90
JS
503 if (fhin != 0)
504 close(fhin);
505 if (fhout != 1)
506 close(fhout);
507 if (fherr != 2)
508 close(fherr);
0d30ad71 509}
ba26f296
JS
510#endif
511
512 if (cmd->pid < 0) {
513 if (need_in)
514 close_pair(fdin);
515 else if (cmd->in)
516 close(cmd->in);
517 if (need_out)
518 close_pair(fdout);
519 else if (cmd->out)
520 close(cmd->out);
521 if (need_err)
522 close_pair(fderr);
fc012c28
D
523 else if (cmd->err)
524 close(cmd->err);
0ac77ec3
JS
525 errno = failed_errno;
526 return -1;
ba26f296 527 }
4919bf03
SP
528
529 if (need_in)
530 close(fdin[0]);
531 else if (cmd->in)
532 close(cmd->in);
533
f4bba25b
SP
534 if (need_out)
535 close(fdout[1]);
c20181e3 536 else if (cmd->out)
f4bba25b
SP
537 close(cmd->out);
538
f3b33f1d
JS
539 if (need_err)
540 close(fderr[1]);
4f41b611
SP
541 else if (cmd->err)
542 close(cmd->err);
f3b33f1d 543
ebcb5d16
SP
544 return 0;
545}
546
2d22c208
JS
547int finish_command(struct child_process *cmd)
548{
13274526 549 return wait_or_whine(cmd->pid, cmd->argv[0]);
2d22c208
JS
550}
551
ebcb5d16
SP
552int run_command(struct child_process *cmd)
553{
554 int code = start_command(cmd);
555 if (code)
556 return code;
557 return finish_command(cmd);
558}
559
1568fea0 560static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148
AR
561 const char **argv,
562 int opt)
1568fea0
AR
563{
564 memset(cmd, 0, sizeof(*cmd));
565 cmd->argv = argv;
566 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
567 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
568 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
c024beb5 569 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
8dba1e63 570 cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
10c6cddd 571 cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
1568fea0
AR
572}
573
f1000898
SP
574int run_command_v_opt(const char **argv, int opt)
575{
576 struct child_process cmd;
1568fea0
AR
577 prepare_run_command_v_opt(&cmd, argv, opt);
578 return run_command(&cmd);
579}
580
ee493148
AR
581int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
582{
583 struct child_process cmd;
584 prepare_run_command_v_opt(&cmd, argv, opt);
585 cmd.dir = dir;
586 cmd.env = env;
587 return run_command(&cmd);
588}
2d22c208 589
f6b60983 590#ifndef NO_PTHREADS
0ea1c89b
JS
591static pthread_t main_thread;
592static int main_thread_set;
593static pthread_key_t async_key;
1ece66bc 594static pthread_key_t async_die_counter;
0ea1c89b 595
200a76b7 596static void *run_thread(void *data)
618ebe9f
JS
597{
598 struct async *async = data;
f6b60983 599 intptr_t ret;
0ea1c89b
JS
600
601 pthread_setspecific(async_key, async);
f6b60983 602 ret = async->proc(async->proc_in, async->proc_out, async->data);
200a76b7 603 return (void *)ret;
618ebe9f 604}
0ea1c89b
JS
605
606static NORETURN void die_async(const char *err, va_list params)
607{
608 vreportf("fatal: ", err, params);
609
610 if (!pthread_equal(main_thread, pthread_self())) {
611 struct async *async = pthread_getspecific(async_key);
612 if (async->proc_in >= 0)
613 close(async->proc_in);
614 if (async->proc_out >= 0)
615 close(async->proc_out);
616 pthread_exit((void *)128);
617 }
618
619 exit(128);
618ebe9f 620}
1ece66bc
JK
621
622static int async_die_is_recursing(void)
623{
624 void *ret = pthread_getspecific(async_die_counter);
625 pthread_setspecific(async_die_counter, (void *)1);
626 return ret != NULL;
627}
628
618ebe9f
JS
629#endif
630
2d22c208
JS
631int start_async(struct async *async)
632{
ae6a5609
EFL
633 int need_in, need_out;
634 int fdin[2], fdout[2];
635 int proc_in, proc_out;
2d22c208 636
ae6a5609
EFL
637 need_in = async->in < 0;
638 if (need_in) {
639 if (pipe(fdin) < 0) {
640 if (async->out > 0)
641 close(async->out);
642 return error("cannot create pipe: %s", strerror(errno));
643 }
644 async->in = fdin[1];
645 }
646
647 need_out = async->out < 0;
648 if (need_out) {
649 if (pipe(fdout) < 0) {
650 if (need_in)
651 close_pair(fdin);
652 else if (async->in)
653 close(async->in);
654 return error("cannot create pipe: %s", strerror(errno));
655 }
656 async->out = fdout[0];
657 }
658
659 if (need_in)
660 proc_in = fdin[0];
661 else if (async->in)
662 proc_in = async->in;
663 else
664 proc_in = -1;
665
666 if (need_out)
667 proc_out = fdout[1];
668 else if (async->out)
669 proc_out = async->out;
670 else
671 proc_out = -1;
2d22c208 672
f6b60983 673#ifdef NO_PTHREADS
2c3766f0
AM
674 /* Flush stdio before fork() to avoid cloning buffers */
675 fflush(NULL);
676
2d22c208
JS
677 async->pid = fork();
678 if (async->pid < 0) {
679 error("fork (async) failed: %s", strerror(errno));
ae6a5609 680 goto error;
2d22c208
JS
681 }
682 if (!async->pid) {
ae6a5609
EFL
683 if (need_in)
684 close(fdin[1]);
685 if (need_out)
686 close(fdout[0]);
687 exit(!!async->proc(proc_in, proc_out, async->data));
2d22c208 688 }
ae6a5609 689
afe19ff7
JK
690 mark_child_for_cleanup(async->pid);
691
ae6a5609
EFL
692 if (need_in)
693 close(fdin[0]);
694 else if (async->in)
695 close(async->in);
696
697 if (need_out)
698 close(fdout[1]);
699 else if (async->out)
700 close(async->out);
618ebe9f 701#else
0ea1c89b
JS
702 if (!main_thread_set) {
703 /*
704 * We assume that the first time that start_async is called
705 * it is from the main thread.
706 */
707 main_thread_set = 1;
708 main_thread = pthread_self();
709 pthread_key_create(&async_key, NULL);
1ece66bc 710 pthread_key_create(&async_die_counter, NULL);
0ea1c89b 711 set_die_routine(die_async);
1ece66bc 712 set_die_is_recursing_routine(async_die_is_recursing);
0ea1c89b
JS
713 }
714
200a76b7
JS
715 if (proc_in >= 0)
716 set_cloexec(proc_in);
717 if (proc_out >= 0)
718 set_cloexec(proc_out);
ae6a5609
EFL
719 async->proc_in = proc_in;
720 async->proc_out = proc_out;
200a76b7
JS
721 {
722 int err = pthread_create(&async->tid, NULL, run_thread, async);
723 if (err) {
724 error("cannot create thread: %s", strerror(err));
725 goto error;
726 }
618ebe9f
JS
727 }
728#endif
2d22c208 729 return 0;
ae6a5609
EFL
730
731error:
732 if (need_in)
733 close_pair(fdin);
734 else if (async->in)
735 close(async->in);
736
737 if (need_out)
738 close_pair(fdout);
739 else if (async->out)
740 close(async->out);
741 return -1;
2d22c208
JS
742}
743
744int finish_async(struct async *async)
745{
f6b60983 746#ifdef NO_PTHREADS
0398fc34 747 return wait_or_whine(async->pid, "child process");
618ebe9f 748#else
200a76b7
JS
749 void *ret = (void *)(intptr_t)(-1);
750
751 if (pthread_join(async->tid, &ret))
752 error("pthread_join failed");
753 return (int)(intptr_t)ret;
618ebe9f 754#endif
2d22c208 755}
ae98a008 756
5a7da2dc
AS
757char *find_hook(const char *name)
758{
759 char *path = git_path("hooks/%s", name);
760 if (access(path, X_OK) < 0)
761 path = NULL;
762
763 return path;
764}
765
ae98a008
SB
766int run_hook(const char *index_file, const char *name, ...)
767{
768 struct child_process hook;
5d40a179
JK
769 struct argv_array argv = ARGV_ARRAY_INIT;
770 const char *p, *env[2];
ae98a008
SB
771 char index[PATH_MAX];
772 va_list args;
773 int ret;
ae98a008 774
5a7da2dc
AS
775 p = find_hook(name);
776 if (!p)
cf94ca8e
SB
777 return 0;
778
5a7da2dc
AS
779 argv_array_push(&argv, p);
780
ae98a008 781 va_start(args, name);
5d40a179
JK
782 while ((p = va_arg(args, const char *)))
783 argv_array_push(&argv, p);
ae98a008
SB
784 va_end(args);
785
ae98a008 786 memset(&hook, 0, sizeof(hook));
5d40a179 787 hook.argv = argv.argv;
ae98a008
SB
788 hook.no_stdin = 1;
789 hook.stdout_to_stderr = 1;
790 if (index_file) {
791 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
792 env[0] = index;
793 env[1] = NULL;
794 hook.env = env;
795 }
796
0ac77ec3 797 ret = run_command(&hook);
5d40a179 798 argv_array_clear(&argv);
ae98a008
SB
799 return ret;
800}