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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 | void child_process_init(struct child_process *child) | |
12 | { | |
13 | memset(child, 0, sizeof(*child)); | |
14 | argv_array_init(&child->args); | |
15 | } | |
16 | ||
17 | struct child_to_clean { | |
18 | pid_t pid; | |
19 | struct child_to_clean *next; | |
20 | }; | |
21 | static struct child_to_clean *children_to_clean; | |
22 | static int installed_child_cleanup_handler; | |
23 | ||
24 | static void cleanup_children(int sig) | |
25 | { | |
26 | while (children_to_clean) { | |
27 | struct child_to_clean *p = children_to_clean; | |
28 | children_to_clean = p->next; | |
29 | kill(p->pid, sig); | |
30 | free(p); | |
31 | } | |
32 | } | |
33 | ||
34 | static void cleanup_children_on_signal(int sig) | |
35 | { | |
36 | cleanup_children(sig); | |
37 | sigchain_pop(sig); | |
38 | raise(sig); | |
39 | } | |
40 | ||
41 | static void cleanup_children_on_exit(void) | |
42 | { | |
43 | cleanup_children(SIGTERM); | |
44 | } | |
45 | ||
46 | static void mark_child_for_cleanup(pid_t pid) | |
47 | { | |
48 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
49 | p->pid = pid; | |
50 | p->next = children_to_clean; | |
51 | children_to_clean = p; | |
52 | ||
53 | if (!installed_child_cleanup_handler) { | |
54 | atexit(cleanup_children_on_exit); | |
55 | sigchain_push_common(cleanup_children_on_signal); | |
56 | installed_child_cleanup_handler = 1; | |
57 | } | |
58 | } | |
59 | ||
60 | static void clear_child_for_cleanup(pid_t pid) | |
61 | { | |
62 | struct child_to_clean **pp; | |
63 | ||
64 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { | |
65 | struct child_to_clean *clean_me = *pp; | |
66 | ||
67 | if (clean_me->pid == pid) { | |
68 | *pp = clean_me->next; | |
69 | free(clean_me); | |
70 | return; | |
71 | } | |
72 | } | |
73 | } | |
74 | ||
75 | static inline void close_pair(int fd[2]) | |
76 | { | |
77 | close(fd[0]); | |
78 | close(fd[1]); | |
79 | } | |
80 | ||
81 | #ifndef GIT_WINDOWS_NATIVE | |
82 | static inline void dup_devnull(int to) | |
83 | { | |
84 | int fd = open("/dev/null", O_RDWR); | |
85 | if (fd < 0) | |
86 | die_errno(_("open /dev/null failed")); | |
87 | if (dup2(fd, to) < 0) | |
88 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
89 | close(fd); | |
90 | } | |
91 | #endif | |
92 | ||
93 | static char *locate_in_PATH(const char *file) | |
94 | { | |
95 | const char *p = getenv("PATH"); | |
96 | struct strbuf buf = STRBUF_INIT; | |
97 | ||
98 | if (!p || !*p) | |
99 | return NULL; | |
100 | ||
101 | while (1) { | |
102 | const char *end = strchrnul(p, ':'); | |
103 | ||
104 | strbuf_reset(&buf); | |
105 | ||
106 | /* POSIX specifies an empty entry as the current directory. */ | |
107 | if (end != p) { | |
108 | strbuf_add(&buf, p, end - p); | |
109 | strbuf_addch(&buf, '/'); | |
110 | } | |
111 | strbuf_addstr(&buf, file); | |
112 | ||
113 | if (!access(buf.buf, F_OK)) | |
114 | return strbuf_detach(&buf, NULL); | |
115 | ||
116 | if (!*end) | |
117 | break; | |
118 | p = end + 1; | |
119 | } | |
120 | ||
121 | strbuf_release(&buf); | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | static int exists_in_PATH(const char *file) | |
126 | { | |
127 | char *r = locate_in_PATH(file); | |
128 | free(r); | |
129 | return r != NULL; | |
130 | } | |
131 | ||
132 | int sane_execvp(const char *file, char * const argv[]) | |
133 | { | |
134 | if (!execvp(file, argv)) | |
135 | return 0; /* cannot happen ;-) */ | |
136 | ||
137 | /* | |
138 | * When a command can't be found because one of the directories | |
139 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
140 | * careful usability testing (read: analysis of occasional bug | |
141 | * reports) reveals that "No such file or directory" is more | |
142 | * intuitive. | |
143 | * | |
144 | * We avoid commands with "/", because execvp will not do $PATH | |
145 | * lookups in that case. | |
146 | * | |
147 | * The reassignment of EACCES to errno looks like a no-op below, | |
148 | * but we need to protect against exists_in_PATH overwriting errno. | |
149 | */ | |
150 | if (errno == EACCES && !strchr(file, '/')) | |
151 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
152 | else if (errno == ENOTDIR && !strchr(file, '/')) | |
153 | errno = ENOENT; | |
154 | return -1; | |
155 | } | |
156 | ||
157 | static const char **prepare_shell_cmd(const char **argv) | |
158 | { | |
159 | int argc, nargc = 0; | |
160 | const char **nargv; | |
161 | ||
162 | for (argc = 0; argv[argc]; argc++) | |
163 | ; /* just counting */ | |
164 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
165 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
166 | ||
167 | if (argc < 1) | |
168 | die("BUG: shell command is empty"); | |
169 | ||
170 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { | |
171 | #ifndef GIT_WINDOWS_NATIVE | |
172 | nargv[nargc++] = SHELL_PATH; | |
173 | #else | |
174 | nargv[nargc++] = "sh"; | |
175 | #endif | |
176 | nargv[nargc++] = "-c"; | |
177 | ||
178 | if (argc < 2) | |
179 | nargv[nargc++] = argv[0]; | |
180 | else { | |
181 | struct strbuf arg0 = STRBUF_INIT; | |
182 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
183 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
184 | } | |
185 | } | |
186 | ||
187 | for (argc = 0; argv[argc]; argc++) | |
188 | nargv[nargc++] = argv[argc]; | |
189 | nargv[nargc] = NULL; | |
190 | ||
191 | return nargv; | |
192 | } | |
193 | ||
194 | #ifndef GIT_WINDOWS_NATIVE | |
195 | static int execv_shell_cmd(const char **argv) | |
196 | { | |
197 | const char **nargv = prepare_shell_cmd(argv); | |
198 | trace_argv_printf(nargv, "trace: exec:"); | |
199 | sane_execvp(nargv[0], (char **)nargv); | |
200 | free(nargv); | |
201 | return -1; | |
202 | } | |
203 | #endif | |
204 | ||
205 | #ifndef GIT_WINDOWS_NATIVE | |
206 | static int child_err = 2; | |
207 | static int child_notifier = -1; | |
208 | ||
209 | static void notify_parent(void) | |
210 | { | |
211 | /* | |
212 | * execvp failed. If possible, we'd like to let start_command | |
213 | * know, so failures like ENOENT can be handled right away; but | |
214 | * otherwise, finish_command will still report the error. | |
215 | */ | |
216 | xwrite(child_notifier, "", 1); | |
217 | } | |
218 | ||
219 | static NORETURN void die_child(const char *err, va_list params) | |
220 | { | |
221 | vwritef(child_err, "fatal: ", err, params); | |
222 | exit(128); | |
223 | } | |
224 | ||
225 | static void error_child(const char *err, va_list params) | |
226 | { | |
227 | vwritef(child_err, "error: ", err, params); | |
228 | } | |
229 | #endif | |
230 | ||
231 | static inline void set_cloexec(int fd) | |
232 | { | |
233 | int flags = fcntl(fd, F_GETFD); | |
234 | if (flags >= 0) | |
235 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
236 | } | |
237 | ||
238 | static int wait_or_whine(pid_t pid, const char *argv0) | |
239 | { | |
240 | int status, code = -1; | |
241 | pid_t waiting; | |
242 | int failed_errno = 0; | |
243 | ||
244 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
245 | ; /* nothing */ | |
246 | ||
247 | if (waiting < 0) { | |
248 | failed_errno = errno; | |
249 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
250 | } else if (waiting != pid) { | |
251 | error("waitpid is confused (%s)", argv0); | |
252 | } else if (WIFSIGNALED(status)) { | |
253 | code = WTERMSIG(status); | |
254 | if (code != SIGINT && code != SIGQUIT) | |
255 | error("%s died of signal %d", argv0, code); | |
256 | /* | |
257 | * This return value is chosen so that code & 0xff | |
258 | * mimics the exit code that a POSIX shell would report for | |
259 | * a program that died from this signal. | |
260 | */ | |
261 | code += 128; | |
262 | } else if (WIFEXITED(status)) { | |
263 | code = WEXITSTATUS(status); | |
264 | /* | |
265 | * Convert special exit code when execvp failed. | |
266 | */ | |
267 | if (code == 127) { | |
268 | code = -1; | |
269 | failed_errno = ENOENT; | |
270 | } | |
271 | } else { | |
272 | error("waitpid is confused (%s)", argv0); | |
273 | } | |
274 | ||
275 | clear_child_for_cleanup(pid); | |
276 | ||
277 | errno = failed_errno; | |
278 | return code; | |
279 | } | |
280 | ||
281 | int start_command(struct child_process *cmd) | |
282 | { | |
283 | int need_in, need_out, need_err; | |
284 | int fdin[2], fdout[2], fderr[2]; | |
285 | int failed_errno; | |
286 | char *str; | |
287 | ||
288 | if (!cmd->argv) | |
289 | cmd->argv = cmd->args.argv; | |
290 | ||
291 | /* | |
292 | * In case of errors we must keep the promise to close FDs | |
293 | * that have been passed in via ->in and ->out. | |
294 | */ | |
295 | ||
296 | need_in = !cmd->no_stdin && cmd->in < 0; | |
297 | if (need_in) { | |
298 | if (pipe(fdin) < 0) { | |
299 | failed_errno = errno; | |
300 | if (cmd->out > 0) | |
301 | close(cmd->out); | |
302 | str = "standard input"; | |
303 | goto fail_pipe; | |
304 | } | |
305 | cmd->in = fdin[1]; | |
306 | } | |
307 | ||
308 | need_out = !cmd->no_stdout | |
309 | && !cmd->stdout_to_stderr | |
310 | && cmd->out < 0; | |
311 | if (need_out) { | |
312 | if (pipe(fdout) < 0) { | |
313 | failed_errno = errno; | |
314 | if (need_in) | |
315 | close_pair(fdin); | |
316 | else if (cmd->in) | |
317 | close(cmd->in); | |
318 | str = "standard output"; | |
319 | goto fail_pipe; | |
320 | } | |
321 | cmd->out = fdout[0]; | |
322 | } | |
323 | ||
324 | need_err = !cmd->no_stderr && cmd->err < 0; | |
325 | if (need_err) { | |
326 | if (pipe(fderr) < 0) { | |
327 | failed_errno = errno; | |
328 | if (need_in) | |
329 | close_pair(fdin); | |
330 | else if (cmd->in) | |
331 | close(cmd->in); | |
332 | if (need_out) | |
333 | close_pair(fdout); | |
334 | else if (cmd->out) | |
335 | close(cmd->out); | |
336 | str = "standard error"; | |
337 | fail_pipe: | |
338 | error("cannot create %s pipe for %s: %s", | |
339 | str, cmd->argv[0], strerror(failed_errno)); | |
340 | argv_array_clear(&cmd->args); | |
341 | errno = failed_errno; | |
342 | return -1; | |
343 | } | |
344 | cmd->err = fderr[0]; | |
345 | } | |
346 | ||
347 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
348 | fflush(NULL); | |
349 | ||
350 | #ifndef GIT_WINDOWS_NATIVE | |
351 | { | |
352 | int notify_pipe[2]; | |
353 | if (pipe(notify_pipe)) | |
354 | notify_pipe[0] = notify_pipe[1] = -1; | |
355 | ||
356 | cmd->pid = fork(); | |
357 | failed_errno = errno; | |
358 | if (!cmd->pid) { | |
359 | /* | |
360 | * Redirect the channel to write syscall error messages to | |
361 | * before redirecting the process's stderr so that all die() | |
362 | * in subsequent call paths use the parent's stderr. | |
363 | */ | |
364 | if (cmd->no_stderr || need_err) { | |
365 | child_err = dup(2); | |
366 | set_cloexec(child_err); | |
367 | } | |
368 | set_die_routine(die_child); | |
369 | set_error_routine(error_child); | |
370 | ||
371 | close(notify_pipe[0]); | |
372 | set_cloexec(notify_pipe[1]); | |
373 | child_notifier = notify_pipe[1]; | |
374 | atexit(notify_parent); | |
375 | ||
376 | if (cmd->no_stdin) | |
377 | dup_devnull(0); | |
378 | else if (need_in) { | |
379 | dup2(fdin[0], 0); | |
380 | close_pair(fdin); | |
381 | } else if (cmd->in) { | |
382 | dup2(cmd->in, 0); | |
383 | close(cmd->in); | |
384 | } | |
385 | ||
386 | if (cmd->no_stderr) | |
387 | dup_devnull(2); | |
388 | else if (need_err) { | |
389 | dup2(fderr[1], 2); | |
390 | close_pair(fderr); | |
391 | } else if (cmd->err > 1) { | |
392 | dup2(cmd->err, 2); | |
393 | close(cmd->err); | |
394 | } | |
395 | ||
396 | if (cmd->no_stdout) | |
397 | dup_devnull(1); | |
398 | else if (cmd->stdout_to_stderr) | |
399 | dup2(2, 1); | |
400 | else if (need_out) { | |
401 | dup2(fdout[1], 1); | |
402 | close_pair(fdout); | |
403 | } else if (cmd->out > 1) { | |
404 | dup2(cmd->out, 1); | |
405 | close(cmd->out); | |
406 | } | |
407 | ||
408 | if (cmd->dir && chdir(cmd->dir)) | |
409 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], | |
410 | cmd->dir); | |
411 | if (cmd->env) { | |
412 | for (; *cmd->env; cmd->env++) { | |
413 | if (strchr(*cmd->env, '=')) | |
414 | putenv((char *)*cmd->env); | |
415 | else | |
416 | unsetenv(*cmd->env); | |
417 | } | |
418 | } | |
419 | if (cmd->git_cmd) | |
420 | execv_git_cmd(cmd->argv); | |
421 | else if (cmd->use_shell) | |
422 | execv_shell_cmd(cmd->argv); | |
423 | else | |
424 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); | |
425 | if (errno == ENOENT) { | |
426 | if (!cmd->silent_exec_failure) | |
427 | error("cannot run %s: %s", cmd->argv[0], | |
428 | strerror(ENOENT)); | |
429 | exit(127); | |
430 | } else { | |
431 | die_errno("cannot exec '%s'", cmd->argv[0]); | |
432 | } | |
433 | } | |
434 | if (cmd->pid < 0) | |
435 | error("cannot fork() for %s: %s", cmd->argv[0], | |
436 | strerror(errno)); | |
437 | else if (cmd->clean_on_exit) | |
438 | mark_child_for_cleanup(cmd->pid); | |
439 | ||
440 | /* | |
441 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
442 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
443 | * child process sends a single byte. | |
444 | * Note that use of this infrastructure is completely advisory, | |
445 | * therefore, we keep error checks minimal. | |
446 | */ | |
447 | close(notify_pipe[1]); | |
448 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
449 | /* | |
450 | * At this point we know that fork() succeeded, but execvp() | |
451 | * failed. Errors have been reported to our stderr. | |
452 | */ | |
453 | wait_or_whine(cmd->pid, cmd->argv[0]); | |
454 | failed_errno = errno; | |
455 | cmd->pid = -1; | |
456 | } | |
457 | close(notify_pipe[0]); | |
458 | } | |
459 | #else | |
460 | { | |
461 | int fhin = 0, fhout = 1, fherr = 2; | |
462 | const char **sargv = cmd->argv; | |
463 | ||
464 | if (cmd->no_stdin) | |
465 | fhin = open("/dev/null", O_RDWR); | |
466 | else if (need_in) | |
467 | fhin = dup(fdin[0]); | |
468 | else if (cmd->in) | |
469 | fhin = dup(cmd->in); | |
470 | ||
471 | if (cmd->no_stderr) | |
472 | fherr = open("/dev/null", O_RDWR); | |
473 | else if (need_err) | |
474 | fherr = dup(fderr[1]); | |
475 | else if (cmd->err > 2) | |
476 | fherr = dup(cmd->err); | |
477 | ||
478 | if (cmd->no_stdout) | |
479 | fhout = open("/dev/null", O_RDWR); | |
480 | else if (cmd->stdout_to_stderr) | |
481 | fhout = dup(fherr); | |
482 | else if (need_out) | |
483 | fhout = dup(fdout[1]); | |
484 | else if (cmd->out > 1) | |
485 | fhout = dup(cmd->out); | |
486 | ||
487 | if (cmd->git_cmd) | |
488 | cmd->argv = prepare_git_cmd(cmd->argv); | |
489 | else if (cmd->use_shell) | |
490 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
491 | ||
492 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, | |
493 | cmd->dir, fhin, fhout, fherr); | |
494 | failed_errno = errno; | |
495 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) | |
496 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
497 | if (cmd->clean_on_exit && cmd->pid >= 0) | |
498 | mark_child_for_cleanup(cmd->pid); | |
499 | ||
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 | argv_array_clear(&cmd->args); | |
527 | errno = failed_errno; | |
528 | return -1; | |
529 | } | |
530 | ||
531 | if (need_in) | |
532 | close(fdin[0]); | |
533 | else if (cmd->in) | |
534 | close(cmd->in); | |
535 | ||
536 | if (need_out) | |
537 | close(fdout[1]); | |
538 | else if (cmd->out) | |
539 | close(cmd->out); | |
540 | ||
541 | if (need_err) | |
542 | close(fderr[1]); | |
543 | else if (cmd->err) | |
544 | close(cmd->err); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | int finish_command(struct child_process *cmd) | |
550 | { | |
551 | int ret = wait_or_whine(cmd->pid, cmd->argv[0]); | |
552 | argv_array_clear(&cmd->args); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | int 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 | ||
564 | int run_command_v_opt(const char **argv, int opt) | |
565 | { | |
566 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); | |
567 | } | |
568 | ||
569 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
570 | { | |
571 | struct child_process cmd = CHILD_PROCESS_INIT; | |
572 | cmd.argv = argv; | |
573 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
574 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
575 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
576 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
577 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
578 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
579 | cmd.dir = dir; | |
580 | cmd.env = env; | |
581 | return run_command(&cmd); | |
582 | } | |
583 | ||
584 | #ifndef NO_PTHREADS | |
585 | static pthread_t main_thread; | |
586 | static int main_thread_set; | |
587 | static pthread_key_t async_key; | |
588 | static pthread_key_t async_die_counter; | |
589 | ||
590 | static void *run_thread(void *data) | |
591 | { | |
592 | struct async *async = data; | |
593 | intptr_t ret; | |
594 | ||
595 | pthread_setspecific(async_key, async); | |
596 | ret = async->proc(async->proc_in, async->proc_out, async->data); | |
597 | return (void *)ret; | |
598 | } | |
599 | ||
600 | static NORETURN void die_async(const char *err, va_list params) | |
601 | { | |
602 | vreportf("fatal: ", err, params); | |
603 | ||
604 | if (!pthread_equal(main_thread, pthread_self())) { | |
605 | struct async *async = pthread_getspecific(async_key); | |
606 | if (async->proc_in >= 0) | |
607 | close(async->proc_in); | |
608 | if (async->proc_out >= 0) | |
609 | close(async->proc_out); | |
610 | pthread_exit((void *)128); | |
611 | } | |
612 | ||
613 | exit(128); | |
614 | } | |
615 | ||
616 | static int async_die_is_recursing(void) | |
617 | { | |
618 | void *ret = pthread_getspecific(async_die_counter); | |
619 | pthread_setspecific(async_die_counter, (void *)1); | |
620 | return ret != NULL; | |
621 | } | |
622 | ||
623 | #endif | |
624 | ||
625 | int start_async(struct async *async) | |
626 | { | |
627 | int need_in, need_out; | |
628 | int fdin[2], fdout[2]; | |
629 | int proc_in, proc_out; | |
630 | ||
631 | need_in = async->in < 0; | |
632 | if (need_in) { | |
633 | if (pipe(fdin) < 0) { | |
634 | if (async->out > 0) | |
635 | close(async->out); | |
636 | return error("cannot create pipe: %s", strerror(errno)); | |
637 | } | |
638 | async->in = fdin[1]; | |
639 | } | |
640 | ||
641 | need_out = async->out < 0; | |
642 | if (need_out) { | |
643 | if (pipe(fdout) < 0) { | |
644 | if (need_in) | |
645 | close_pair(fdin); | |
646 | else if (async->in) | |
647 | close(async->in); | |
648 | return error("cannot create pipe: %s", strerror(errno)); | |
649 | } | |
650 | async->out = fdout[0]; | |
651 | } | |
652 | ||
653 | if (need_in) | |
654 | proc_in = fdin[0]; | |
655 | else if (async->in) | |
656 | proc_in = async->in; | |
657 | else | |
658 | proc_in = -1; | |
659 | ||
660 | if (need_out) | |
661 | proc_out = fdout[1]; | |
662 | else if (async->out) | |
663 | proc_out = async->out; | |
664 | else | |
665 | proc_out = -1; | |
666 | ||
667 | #ifdef NO_PTHREADS | |
668 | /* Flush stdio before fork() to avoid cloning buffers */ | |
669 | fflush(NULL); | |
670 | ||
671 | async->pid = fork(); | |
672 | if (async->pid < 0) { | |
673 | error("fork (async) failed: %s", strerror(errno)); | |
674 | goto error; | |
675 | } | |
676 | if (!async->pid) { | |
677 | if (need_in) | |
678 | close(fdin[1]); | |
679 | if (need_out) | |
680 | close(fdout[0]); | |
681 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
682 | } | |
683 | ||
684 | mark_child_for_cleanup(async->pid); | |
685 | ||
686 | if (need_in) | |
687 | close(fdin[0]); | |
688 | else if (async->in) | |
689 | close(async->in); | |
690 | ||
691 | if (need_out) | |
692 | close(fdout[1]); | |
693 | else if (async->out) | |
694 | close(async->out); | |
695 | #else | |
696 | if (!main_thread_set) { | |
697 | /* | |
698 | * We assume that the first time that start_async is called | |
699 | * it is from the main thread. | |
700 | */ | |
701 | main_thread_set = 1; | |
702 | main_thread = pthread_self(); | |
703 | pthread_key_create(&async_key, NULL); | |
704 | pthread_key_create(&async_die_counter, NULL); | |
705 | set_die_routine(die_async); | |
706 | set_die_is_recursing_routine(async_die_is_recursing); | |
707 | } | |
708 | ||
709 | if (proc_in >= 0) | |
710 | set_cloexec(proc_in); | |
711 | if (proc_out >= 0) | |
712 | set_cloexec(proc_out); | |
713 | async->proc_in = proc_in; | |
714 | async->proc_out = proc_out; | |
715 | { | |
716 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
717 | if (err) { | |
718 | error("cannot create thread: %s", strerror(err)); | |
719 | goto error; | |
720 | } | |
721 | } | |
722 | #endif | |
723 | return 0; | |
724 | ||
725 | error: | |
726 | if (need_in) | |
727 | close_pair(fdin); | |
728 | else if (async->in) | |
729 | close(async->in); | |
730 | ||
731 | if (need_out) | |
732 | close_pair(fdout); | |
733 | else if (async->out) | |
734 | close(async->out); | |
735 | return -1; | |
736 | } | |
737 | ||
738 | int finish_async(struct async *async) | |
739 | { | |
740 | #ifdef NO_PTHREADS | |
741 | return wait_or_whine(async->pid, "child process"); | |
742 | #else | |
743 | void *ret = (void *)(intptr_t)(-1); | |
744 | ||
745 | if (pthread_join(async->tid, &ret)) | |
746 | error("pthread_join failed"); | |
747 | return (int)(intptr_t)ret; | |
748 | #endif | |
749 | } | |
750 | ||
751 | char *find_hook(const char *name) | |
752 | { | |
753 | char *path = git_path("hooks/%s", name); | |
754 | if (access(path, X_OK) < 0) | |
755 | path = NULL; | |
756 | ||
757 | return path; | |
758 | } | |
759 | ||
760 | int run_hook_ve(const char *const *env, const char *name, va_list args) | |
761 | { | |
762 | struct child_process hook = CHILD_PROCESS_INIT; | |
763 | const char *p; | |
764 | ||
765 | p = find_hook(name); | |
766 | if (!p) | |
767 | return 0; | |
768 | ||
769 | argv_array_push(&hook.args, p); | |
770 | while ((p = va_arg(args, const char *))) | |
771 | argv_array_push(&hook.args, p); | |
772 | hook.env = env; | |
773 | hook.no_stdin = 1; | |
774 | hook.stdout_to_stderr = 1; | |
775 | ||
776 | return run_command(&hook); | |
777 | } | |
778 | ||
779 | int run_hook_le(const char *const *env, const char *name, ...) | |
780 | { | |
781 | va_list args; | |
782 | int ret; | |
783 | ||
784 | va_start(args, name); | |
785 | ret = run_hook_ve(env, name, args); | |
786 | va_end(args); | |
787 | ||
788 | return ret; | |
789 | } | |
790 | ||
791 | int run_hook_with_custom_index(const char *index_file, const char *name, ...) | |
792 | { | |
793 | const char *hook_env[3] = { NULL }; | |
794 | char index[PATH_MAX]; | |
795 | va_list args; | |
796 | int ret; | |
797 | ||
798 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
799 | hook_env[0] = index; | |
800 | ||
801 | va_start(args, name); | |
802 | ret = run_hook_ve(hook_env, name, args); | |
803 | va_end(args); | |
804 | ||
805 | return ret; | |
806 | } |