]>
Commit | Line | Data |
---|---|---|
1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
4 | #include "sigchain.h" | |
5 | #include "argv-array.h" | |
6 | ||
7 | #ifndef SHELL_PATH | |
8 | # define SHELL_PATH "/bin/sh" | |
9 | #endif | |
10 | ||
11 | struct child_to_clean { | |
12 | pid_t pid; | |
13 | struct child_to_clean *next; | |
14 | }; | |
15 | static struct child_to_clean *children_to_clean; | |
16 | static int installed_child_cleanup_handler; | |
17 | ||
18 | static 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 | ||
28 | static void cleanup_children_on_signal(int sig) | |
29 | { | |
30 | cleanup_children(sig); | |
31 | sigchain_pop(sig); | |
32 | raise(sig); | |
33 | } | |
34 | ||
35 | static void cleanup_children_on_exit(void) | |
36 | { | |
37 | cleanup_children(SIGTERM); | |
38 | } | |
39 | ||
40 | static 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 | ||
54 | static void clear_child_for_cleanup(pid_t pid) | |
55 | { | |
56 | struct child_to_clean **last, *p; | |
57 | ||
58 | last = &children_to_clean; | |
59 | for (p = children_to_clean; p; p = p->next) { | |
60 | if (p->pid == pid) { | |
61 | *last = p->next; | |
62 | free(p); | |
63 | return; | |
64 | } | |
65 | } | |
66 | } | |
67 | ||
68 | static inline void close_pair(int fd[2]) | |
69 | { | |
70 | close(fd[0]); | |
71 | close(fd[1]); | |
72 | } | |
73 | ||
74 | #ifndef WIN32 | |
75 | static inline void dup_devnull(int to) | |
76 | { | |
77 | int fd = open("/dev/null", O_RDWR); | |
78 | dup2(fd, to); | |
79 | close(fd); | |
80 | } | |
81 | #endif | |
82 | ||
83 | static char *locate_in_PATH(const char *file) | |
84 | { | |
85 | const char *p = getenv("PATH"); | |
86 | struct strbuf buf = STRBUF_INIT; | |
87 | ||
88 | if (!p || !*p) | |
89 | return NULL; | |
90 | ||
91 | while (1) { | |
92 | const char *end = strchrnul(p, ':'); | |
93 | ||
94 | strbuf_reset(&buf); | |
95 | ||
96 | /* POSIX specifies an empty entry as the current directory. */ | |
97 | if (end != p) { | |
98 | strbuf_add(&buf, p, end - p); | |
99 | strbuf_addch(&buf, '/'); | |
100 | } | |
101 | strbuf_addstr(&buf, file); | |
102 | ||
103 | if (!access(buf.buf, F_OK)) | |
104 | return strbuf_detach(&buf, NULL); | |
105 | ||
106 | if (!*end) | |
107 | break; | |
108 | p = end + 1; | |
109 | } | |
110 | ||
111 | strbuf_release(&buf); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static int exists_in_PATH(const char *file) | |
116 | { | |
117 | char *r = locate_in_PATH(file); | |
118 | free(r); | |
119 | return r != NULL; | |
120 | } | |
121 | ||
122 | int sane_execvp(const char *file, char * const argv[]) | |
123 | { | |
124 | if (!execvp(file, argv)) | |
125 | return 0; /* cannot happen ;-) */ | |
126 | ||
127 | /* | |
128 | * When a command can't be found because one of the directories | |
129 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
130 | * careful usability testing (read: analysis of occasional bug | |
131 | * reports) reveals that "No such file or directory" is more | |
132 | * intuitive. | |
133 | * | |
134 | * We avoid commands with "/", because execvp will not do $PATH | |
135 | * lookups in that case. | |
136 | * | |
137 | * The reassignment of EACCES to errno looks like a no-op below, | |
138 | * but we need to protect against exists_in_PATH overwriting errno. | |
139 | */ | |
140 | if (errno == EACCES && !strchr(file, '/')) | |
141 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
142 | else if (errno == ENOTDIR && !strchr(file, '/')) | |
143 | errno = ENOENT; | |
144 | return -1; | |
145 | } | |
146 | ||
147 | static const char **prepare_shell_cmd(const char **argv) | |
148 | { | |
149 | int argc, nargc = 0; | |
150 | const char **nargv; | |
151 | ||
152 | for (argc = 0; argv[argc]; argc++) | |
153 | ; /* just counting */ | |
154 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
155 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
156 | ||
157 | if (argc < 1) | |
158 | die("BUG: shell command is empty"); | |
159 | ||
160 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { | |
161 | #ifndef WIN32 | |
162 | nargv[nargc++] = SHELL_PATH; | |
163 | #else | |
164 | nargv[nargc++] = "sh"; | |
165 | #endif | |
166 | nargv[nargc++] = "-c"; | |
167 | ||
168 | if (argc < 2) | |
169 | nargv[nargc++] = argv[0]; | |
170 | else { | |
171 | struct strbuf arg0 = STRBUF_INIT; | |
172 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
173 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
174 | } | |
175 | } | |
176 | ||
177 | for (argc = 0; argv[argc]; argc++) | |
178 | nargv[nargc++] = argv[argc]; | |
179 | nargv[nargc] = NULL; | |
180 | ||
181 | return nargv; | |
182 | } | |
183 | ||
184 | #ifndef WIN32 | |
185 | static int execv_shell_cmd(const char **argv) | |
186 | { | |
187 | const char **nargv = prepare_shell_cmd(argv); | |
188 | trace_argv_printf(nargv, "trace: exec:"); | |
189 | sane_execvp(nargv[0], (char **)nargv); | |
190 | free(nargv); | |
191 | return -1; | |
192 | } | |
193 | #endif | |
194 | ||
195 | #ifndef WIN32 | |
196 | static int child_err = 2; | |
197 | static int child_notifier = -1; | |
198 | ||
199 | static void notify_parent(void) | |
200 | { | |
201 | /* | |
202 | * execvp failed. If possible, we'd like to let start_command | |
203 | * know, so failures like ENOENT can be handled right away; but | |
204 | * otherwise, finish_command will still report the error. | |
205 | */ | |
206 | xwrite(child_notifier, "", 1); | |
207 | } | |
208 | ||
209 | static NORETURN void die_child(const char *err, va_list params) | |
210 | { | |
211 | vwritef(child_err, "fatal: ", err, params); | |
212 | exit(128); | |
213 | } | |
214 | ||
215 | static void error_child(const char *err, va_list params) | |
216 | { | |
217 | vwritef(child_err, "error: ", err, params); | |
218 | } | |
219 | #endif | |
220 | ||
221 | static inline void set_cloexec(int fd) | |
222 | { | |
223 | int flags = fcntl(fd, F_GETFD); | |
224 | if (flags >= 0) | |
225 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
226 | } | |
227 | ||
228 | static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure) | |
229 | { | |
230 | int status, code = -1; | |
231 | pid_t waiting; | |
232 | int failed_errno = 0; | |
233 | ||
234 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
235 | ; /* nothing */ | |
236 | ||
237 | if (waiting < 0) { | |
238 | failed_errno = errno; | |
239 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
240 | } else if (waiting != pid) { | |
241 | error("waitpid is confused (%s)", argv0); | |
242 | } else if (WIFSIGNALED(status)) { | |
243 | code = WTERMSIG(status); | |
244 | error("%s died of signal %d", argv0, code); | |
245 | /* | |
246 | * This return value is chosen so that code & 0xff | |
247 | * mimics the exit code that a POSIX shell would report for | |
248 | * a program that died from this signal. | |
249 | */ | |
250 | code -= 128; | |
251 | } else if (WIFEXITED(status)) { | |
252 | code = WEXITSTATUS(status); | |
253 | /* | |
254 | * Convert special exit code when execvp failed. | |
255 | */ | |
256 | if (code == 127) { | |
257 | code = -1; | |
258 | failed_errno = ENOENT; | |
259 | } | |
260 | } else { | |
261 | error("waitpid is confused (%s)", argv0); | |
262 | } | |
263 | ||
264 | clear_child_for_cleanup(pid); | |
265 | ||
266 | errno = failed_errno; | |
267 | return code; | |
268 | } | |
269 | ||
270 | int start_command(struct child_process *cmd) | |
271 | { | |
272 | int need_in, need_out, need_err; | |
273 | int fdin[2], fdout[2], fderr[2]; | |
274 | int failed_errno = failed_errno; | |
275 | ||
276 | /* | |
277 | * In case of errors we must keep the promise to close FDs | |
278 | * that have been passed in via ->in and ->out. | |
279 | */ | |
280 | ||
281 | need_in = !cmd->no_stdin && cmd->in < 0; | |
282 | if (need_in) { | |
283 | if (pipe(fdin) < 0) { | |
284 | failed_errno = errno; | |
285 | if (cmd->out > 0) | |
286 | close(cmd->out); | |
287 | goto fail_pipe; | |
288 | } | |
289 | cmd->in = fdin[1]; | |
290 | } | |
291 | ||
292 | need_out = !cmd->no_stdout | |
293 | && !cmd->stdout_to_stderr | |
294 | && cmd->out < 0; | |
295 | if (need_out) { | |
296 | if (pipe(fdout) < 0) { | |
297 | failed_errno = errno; | |
298 | if (need_in) | |
299 | close_pair(fdin); | |
300 | else if (cmd->in) | |
301 | close(cmd->in); | |
302 | goto fail_pipe; | |
303 | } | |
304 | cmd->out = fdout[0]; | |
305 | } | |
306 | ||
307 | need_err = !cmd->no_stderr && cmd->err < 0; | |
308 | if (need_err) { | |
309 | if (pipe(fderr) < 0) { | |
310 | failed_errno = errno; | |
311 | if (need_in) | |
312 | close_pair(fdin); | |
313 | else if (cmd->in) | |
314 | close(cmd->in); | |
315 | if (need_out) | |
316 | close_pair(fdout); | |
317 | else if (cmd->out) | |
318 | close(cmd->out); | |
319 | fail_pipe: | |
320 | error("cannot create pipe for %s: %s", | |
321 | cmd->argv[0], strerror(failed_errno)); | |
322 | errno = failed_errno; | |
323 | return -1; | |
324 | } | |
325 | cmd->err = fderr[0]; | |
326 | } | |
327 | ||
328 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
329 | fflush(NULL); | |
330 | ||
331 | #ifndef WIN32 | |
332 | { | |
333 | int notify_pipe[2]; | |
334 | if (pipe(notify_pipe)) | |
335 | notify_pipe[0] = notify_pipe[1] = -1; | |
336 | ||
337 | cmd->pid = fork(); | |
338 | if (!cmd->pid) { | |
339 | /* | |
340 | * Redirect the channel to write syscall error messages to | |
341 | * before redirecting the process's stderr so that all die() | |
342 | * in subsequent call paths use the parent's stderr. | |
343 | */ | |
344 | if (cmd->no_stderr || need_err) { | |
345 | child_err = dup(2); | |
346 | set_cloexec(child_err); | |
347 | } | |
348 | set_die_routine(die_child); | |
349 | set_error_routine(error_child); | |
350 | ||
351 | close(notify_pipe[0]); | |
352 | set_cloexec(notify_pipe[1]); | |
353 | child_notifier = notify_pipe[1]; | |
354 | atexit(notify_parent); | |
355 | ||
356 | if (cmd->no_stdin) | |
357 | dup_devnull(0); | |
358 | else if (need_in) { | |
359 | dup2(fdin[0], 0); | |
360 | close_pair(fdin); | |
361 | } else if (cmd->in) { | |
362 | dup2(cmd->in, 0); | |
363 | close(cmd->in); | |
364 | } | |
365 | ||
366 | if (cmd->no_stderr) | |
367 | dup_devnull(2); | |
368 | else if (need_err) { | |
369 | dup2(fderr[1], 2); | |
370 | close_pair(fderr); | |
371 | } else if (cmd->err > 1) { | |
372 | dup2(cmd->err, 2); | |
373 | close(cmd->err); | |
374 | } | |
375 | ||
376 | if (cmd->no_stdout) | |
377 | dup_devnull(1); | |
378 | else if (cmd->stdout_to_stderr) | |
379 | dup2(2, 1); | |
380 | else if (need_out) { | |
381 | dup2(fdout[1], 1); | |
382 | close_pair(fdout); | |
383 | } else if (cmd->out > 1) { | |
384 | dup2(cmd->out, 1); | |
385 | close(cmd->out); | |
386 | } | |
387 | ||
388 | if (cmd->dir && chdir(cmd->dir)) | |
389 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], | |
390 | cmd->dir); | |
391 | if (cmd->env) { | |
392 | for (; *cmd->env; cmd->env++) { | |
393 | if (strchr(*cmd->env, '=')) | |
394 | putenv((char *)*cmd->env); | |
395 | else | |
396 | unsetenv(*cmd->env); | |
397 | } | |
398 | } | |
399 | if (cmd->preexec_cb) { | |
400 | /* | |
401 | * We cannot predict what the pre-exec callback does. | |
402 | * Forgo parent notification. | |
403 | */ | |
404 | close(child_notifier); | |
405 | child_notifier = -1; | |
406 | ||
407 | cmd->preexec_cb(); | |
408 | } | |
409 | if (cmd->git_cmd) { | |
410 | execv_git_cmd(cmd->argv); | |
411 | } else if (cmd->use_shell) { | |
412 | execv_shell_cmd(cmd->argv); | |
413 | } else { | |
414 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); | |
415 | } | |
416 | if (errno == ENOENT) { | |
417 | if (!cmd->silent_exec_failure) | |
418 | error("cannot run %s: %s", cmd->argv[0], | |
419 | strerror(ENOENT)); | |
420 | exit(127); | |
421 | } else { | |
422 | die_errno("cannot exec '%s'", cmd->argv[0]); | |
423 | } | |
424 | } | |
425 | if (cmd->pid < 0) | |
426 | error("cannot fork() for %s: %s", cmd->argv[0], | |
427 | strerror(failed_errno = errno)); | |
428 | else if (cmd->clean_on_exit) | |
429 | mark_child_for_cleanup(cmd->pid); | |
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], ¬ify_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 | */ | |
444 | wait_or_whine(cmd->pid, cmd->argv[0], | |
445 | cmd->silent_exec_failure); | |
446 | failed_errno = errno; | |
447 | cmd->pid = -1; | |
448 | } | |
449 | close(notify_pipe[0]); | |
450 | ||
451 | } | |
452 | #else | |
453 | { | |
454 | int fhin = 0, fhout = 1, fherr = 2; | |
455 | const char **sargv = cmd->argv; | |
456 | char **env = environ; | |
457 | ||
458 | if (cmd->no_stdin) | |
459 | fhin = open("/dev/null", O_RDWR); | |
460 | else if (need_in) | |
461 | fhin = dup(fdin[0]); | |
462 | else if (cmd->in) | |
463 | fhin = dup(cmd->in); | |
464 | ||
465 | if (cmd->no_stderr) | |
466 | fherr = open("/dev/null", O_RDWR); | |
467 | else if (need_err) | |
468 | fherr = dup(fderr[1]); | |
469 | else if (cmd->err > 2) | |
470 | fherr = dup(cmd->err); | |
471 | ||
472 | if (cmd->no_stdout) | |
473 | fhout = open("/dev/null", O_RDWR); | |
474 | else if (cmd->stdout_to_stderr) | |
475 | fhout = dup(fherr); | |
476 | else if (need_out) | |
477 | fhout = dup(fdout[1]); | |
478 | else if (cmd->out > 1) | |
479 | fhout = dup(cmd->out); | |
480 | ||
481 | if (cmd->env) | |
482 | env = make_augmented_environ(cmd->env); | |
483 | ||
484 | if (cmd->git_cmd) { | |
485 | cmd->argv = prepare_git_cmd(cmd->argv); | |
486 | } else if (cmd->use_shell) { | |
487 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
488 | } | |
489 | ||
490 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir, | |
491 | fhin, fhout, fherr); | |
492 | failed_errno = errno; | |
493 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) | |
494 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
495 | if (cmd->clean_on_exit && cmd->pid >= 0) | |
496 | mark_child_for_cleanup(cmd->pid); | |
497 | ||
498 | if (cmd->env) | |
499 | free_environ(env); | |
500 | if (cmd->git_cmd) | |
501 | free(cmd->argv); | |
502 | ||
503 | cmd->argv = sargv; | |
504 | if (fhin != 0) | |
505 | close(fhin); | |
506 | if (fhout != 1) | |
507 | close(fhout); | |
508 | if (fherr != 2) | |
509 | close(fherr); | |
510 | } | |
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); | |
524 | else if (cmd->err) | |
525 | close(cmd->err); | |
526 | errno = failed_errno; | |
527 | return -1; | |
528 | } | |
529 | ||
530 | if (need_in) | |
531 | close(fdin[0]); | |
532 | else if (cmd->in) | |
533 | close(cmd->in); | |
534 | ||
535 | if (need_out) | |
536 | close(fdout[1]); | |
537 | else if (cmd->out) | |
538 | close(cmd->out); | |
539 | ||
540 | if (need_err) | |
541 | close(fderr[1]); | |
542 | else if (cmd->err) | |
543 | close(cmd->err); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | int finish_command(struct child_process *cmd) | |
549 | { | |
550 | return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure); | |
551 | } | |
552 | ||
553 | int run_command(struct child_process *cmd) | |
554 | { | |
555 | int code = start_command(cmd); | |
556 | if (code) | |
557 | return code; | |
558 | return finish_command(cmd); | |
559 | } | |
560 | ||
561 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
562 | const char **argv, | |
563 | int opt) | |
564 | { | |
565 | memset(cmd, 0, sizeof(*cmd)); | |
566 | cmd->argv = argv; | |
567 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
568 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
569 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
570 | cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
571 | cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
572 | cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
573 | } | |
574 | ||
575 | int run_command_v_opt(const char **argv, int opt) | |
576 | { | |
577 | struct child_process cmd; | |
578 | prepare_run_command_v_opt(&cmd, argv, opt); | |
579 | return run_command(&cmd); | |
580 | } | |
581 | ||
582 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
583 | { | |
584 | struct child_process cmd; | |
585 | prepare_run_command_v_opt(&cmd, argv, opt); | |
586 | cmd.dir = dir; | |
587 | cmd.env = env; | |
588 | return run_command(&cmd); | |
589 | } | |
590 | ||
591 | #ifndef NO_PTHREADS | |
592 | static pthread_t main_thread; | |
593 | static int main_thread_set; | |
594 | static pthread_key_t async_key; | |
595 | ||
596 | static void *run_thread(void *data) | |
597 | { | |
598 | struct async *async = data; | |
599 | intptr_t ret; | |
600 | ||
601 | pthread_setspecific(async_key, async); | |
602 | ret = async->proc(async->proc_in, async->proc_out, async->data); | |
603 | return (void *)ret; | |
604 | } | |
605 | ||
606 | static 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); | |
620 | } | |
621 | #endif | |
622 | ||
623 | int start_async(struct async *async) | |
624 | { | |
625 | int need_in, need_out; | |
626 | int fdin[2], fdout[2]; | |
627 | int proc_in, proc_out; | |
628 | ||
629 | need_in = async->in < 0; | |
630 | if (need_in) { | |
631 | if (pipe(fdin) < 0) { | |
632 | if (async->out > 0) | |
633 | close(async->out); | |
634 | return error("cannot create pipe: %s", strerror(errno)); | |
635 | } | |
636 | async->in = fdin[1]; | |
637 | } | |
638 | ||
639 | need_out = async->out < 0; | |
640 | if (need_out) { | |
641 | if (pipe(fdout) < 0) { | |
642 | if (need_in) | |
643 | close_pair(fdin); | |
644 | else if (async->in) | |
645 | close(async->in); | |
646 | return error("cannot create pipe: %s", strerror(errno)); | |
647 | } | |
648 | async->out = fdout[0]; | |
649 | } | |
650 | ||
651 | if (need_in) | |
652 | proc_in = fdin[0]; | |
653 | else if (async->in) | |
654 | proc_in = async->in; | |
655 | else | |
656 | proc_in = -1; | |
657 | ||
658 | if (need_out) | |
659 | proc_out = fdout[1]; | |
660 | else if (async->out) | |
661 | proc_out = async->out; | |
662 | else | |
663 | proc_out = -1; | |
664 | ||
665 | #ifdef NO_PTHREADS | |
666 | /* Flush stdio before fork() to avoid cloning buffers */ | |
667 | fflush(NULL); | |
668 | ||
669 | async->pid = fork(); | |
670 | if (async->pid < 0) { | |
671 | error("fork (async) failed: %s", strerror(errno)); | |
672 | goto error; | |
673 | } | |
674 | if (!async->pid) { | |
675 | if (need_in) | |
676 | close(fdin[1]); | |
677 | if (need_out) | |
678 | close(fdout[0]); | |
679 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
680 | } | |
681 | ||
682 | mark_child_for_cleanup(async->pid); | |
683 | ||
684 | if (need_in) | |
685 | close(fdin[0]); | |
686 | else if (async->in) | |
687 | close(async->in); | |
688 | ||
689 | if (need_out) | |
690 | close(fdout[1]); | |
691 | else if (async->out) | |
692 | close(async->out); | |
693 | #else | |
694 | if (!main_thread_set) { | |
695 | /* | |
696 | * We assume that the first time that start_async is called | |
697 | * it is from the main thread. | |
698 | */ | |
699 | main_thread_set = 1; | |
700 | main_thread = pthread_self(); | |
701 | pthread_key_create(&async_key, NULL); | |
702 | set_die_routine(die_async); | |
703 | } | |
704 | ||
705 | if (proc_in >= 0) | |
706 | set_cloexec(proc_in); | |
707 | if (proc_out >= 0) | |
708 | set_cloexec(proc_out); | |
709 | async->proc_in = proc_in; | |
710 | async->proc_out = proc_out; | |
711 | { | |
712 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
713 | if (err) { | |
714 | error("cannot create thread: %s", strerror(err)); | |
715 | goto error; | |
716 | } | |
717 | } | |
718 | #endif | |
719 | return 0; | |
720 | ||
721 | error: | |
722 | if (need_in) | |
723 | close_pair(fdin); | |
724 | else if (async->in) | |
725 | close(async->in); | |
726 | ||
727 | if (need_out) | |
728 | close_pair(fdout); | |
729 | else if (async->out) | |
730 | close(async->out); | |
731 | return -1; | |
732 | } | |
733 | ||
734 | int finish_async(struct async *async) | |
735 | { | |
736 | #ifdef NO_PTHREADS | |
737 | return wait_or_whine(async->pid, "child process", 0); | |
738 | #else | |
739 | void *ret = (void *)(intptr_t)(-1); | |
740 | ||
741 | if (pthread_join(async->tid, &ret)) | |
742 | error("pthread_join failed"); | |
743 | return (int)(intptr_t)ret; | |
744 | #endif | |
745 | } | |
746 | ||
747 | int run_hook(const char *index_file, const char *name, ...) | |
748 | { | |
749 | struct child_process hook; | |
750 | struct argv_array argv = ARGV_ARRAY_INIT; | |
751 | const char *p, *env[2]; | |
752 | char index[PATH_MAX]; | |
753 | va_list args; | |
754 | int ret; | |
755 | ||
756 | if (access(git_path("hooks/%s", name), X_OK) < 0) | |
757 | return 0; | |
758 | ||
759 | va_start(args, name); | |
760 | argv_array_push(&argv, git_path("hooks/%s", name)); | |
761 | while ((p = va_arg(args, const char *))) | |
762 | argv_array_push(&argv, p); | |
763 | va_end(args); | |
764 | ||
765 | memset(&hook, 0, sizeof(hook)); | |
766 | hook.argv = argv.argv; | |
767 | hook.no_stdin = 1; | |
768 | hook.stdout_to_stderr = 1; | |
769 | if (index_file) { | |
770 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
771 | env[0] = index; | |
772 | env[1] = NULL; | |
773 | hook.env = env; | |
774 | } | |
775 | ||
776 | ret = run_command(&hook); | |
777 | argv_array_clear(&argv); | |
778 | return ret; | |
779 | } |