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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 | 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 **pp; | |
57 | ||
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); | |
64 | return; | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | static inline void close_pair(int fd[2]) | |
70 | { | |
71 | close(fd[0]); | |
72 | close(fd[1]); | |
73 | } | |
74 | ||
75 | #ifndef GIT_WINDOWS_NATIVE | |
76 | static inline void dup_devnull(int to) | |
77 | { | |
78 | int fd = open("/dev/null", O_RDWR); | |
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); | |
83 | close(fd); | |
84 | } | |
85 | #endif | |
86 | ||
87 | static 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 | ||
119 | static int exists_in_PATH(const char *file) | |
120 | { | |
121 | char *r = locate_in_PATH(file); | |
122 | free(r); | |
123 | return r != NULL; | |
124 | } | |
125 | ||
126 | int 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; | |
146 | else if (errno == ENOTDIR && !strchr(file, '/')) | |
147 | errno = ENOENT; | |
148 | return -1; | |
149 | } | |
150 | ||
151 | static 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 $0 */ | |
159 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
160 | ||
161 | if (argc < 1) | |
162 | die("BUG: shell command is empty"); | |
163 | ||
164 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { | |
165 | #ifndef GIT_WINDOWS_NATIVE | |
166 | nargv[nargc++] = SHELL_PATH; | |
167 | #else | |
168 | nargv[nargc++] = "sh"; | |
169 | #endif | |
170 | nargv[nargc++] = "-c"; | |
171 | ||
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 | } | |
179 | } | |
180 | ||
181 | for (argc = 0; argv[argc]; argc++) | |
182 | nargv[nargc++] = argv[argc]; | |
183 | nargv[nargc] = NULL; | |
184 | ||
185 | return nargv; | |
186 | } | |
187 | ||
188 | #ifndef GIT_WINDOWS_NATIVE | |
189 | static int execv_shell_cmd(const char **argv) | |
190 | { | |
191 | const char **nargv = prepare_shell_cmd(argv); | |
192 | trace_argv_printf(nargv, "trace: exec:"); | |
193 | sane_execvp(nargv[0], (char **)nargv); | |
194 | free(nargv); | |
195 | return -1; | |
196 | } | |
197 | #endif | |
198 | ||
199 | #ifndef GIT_WINDOWS_NATIVE | |
200 | static int child_err = 2; | |
201 | static int child_notifier = -1; | |
202 | ||
203 | static void notify_parent(void) | |
204 | { | |
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); | |
211 | } | |
212 | ||
213 | static NORETURN void die_child(const char *err, va_list params) | |
214 | { | |
215 | vwritef(child_err, "fatal: ", err, params); | |
216 | exit(128); | |
217 | } | |
218 | ||
219 | static void error_child(const char *err, va_list params) | |
220 | { | |
221 | vwritef(child_err, "error: ", err, params); | |
222 | } | |
223 | #endif | |
224 | ||
225 | static 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 | } | |
231 | ||
232 | static int wait_or_whine(pid_t pid, const char *argv0) | |
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); | |
248 | if (code != SIGINT && code != SIGQUIT) | |
249 | error("%s died of signal %d", argv0, code); | |
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 | */ | |
255 | code += 128; | |
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; | |
264 | } | |
265 | } else { | |
266 | error("waitpid is confused (%s)", argv0); | |
267 | } | |
268 | ||
269 | clear_child_for_cleanup(pid); | |
270 | ||
271 | errno = failed_errno; | |
272 | return code; | |
273 | } | |
274 | ||
275 | int start_command(struct child_process *cmd) | |
276 | { | |
277 | int need_in, need_out, need_err; | |
278 | int fdin[2], fdout[2], fderr[2]; | |
279 | int failed_errno; | |
280 | char *str; | |
281 | ||
282 | if (!cmd->argv) | |
283 | cmd->argv = cmd->args.argv; | |
284 | ||
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 | ||
290 | need_in = !cmd->no_stdin && cmd->in < 0; | |
291 | if (need_in) { | |
292 | if (pipe(fdin) < 0) { | |
293 | failed_errno = errno; | |
294 | if (cmd->out > 0) | |
295 | close(cmd->out); | |
296 | str = "standard input"; | |
297 | goto fail_pipe; | |
298 | } | |
299 | cmd->in = fdin[1]; | |
300 | } | |
301 | ||
302 | need_out = !cmd->no_stdout | |
303 | && !cmd->stdout_to_stderr | |
304 | && cmd->out < 0; | |
305 | if (need_out) { | |
306 | if (pipe(fdout) < 0) { | |
307 | failed_errno = errno; | |
308 | if (need_in) | |
309 | close_pair(fdin); | |
310 | else if (cmd->in) | |
311 | close(cmd->in); | |
312 | str = "standard output"; | |
313 | goto fail_pipe; | |
314 | } | |
315 | cmd->out = fdout[0]; | |
316 | } | |
317 | ||
318 | need_err = !cmd->no_stderr && cmd->err < 0; | |
319 | if (need_err) { | |
320 | if (pipe(fderr) < 0) { | |
321 | failed_errno = errno; | |
322 | if (need_in) | |
323 | close_pair(fdin); | |
324 | else if (cmd->in) | |
325 | close(cmd->in); | |
326 | if (need_out) | |
327 | close_pair(fdout); | |
328 | else if (cmd->out) | |
329 | close(cmd->out); | |
330 | str = "standard error"; | |
331 | fail_pipe: | |
332 | error("cannot create %s pipe for %s: %s", | |
333 | str, cmd->argv[0], strerror(failed_errno)); | |
334 | argv_array_clear(&cmd->args); | |
335 | errno = failed_errno; | |
336 | return -1; | |
337 | } | |
338 | cmd->err = fderr[0]; | |
339 | } | |
340 | ||
341 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
342 | fflush(NULL); | |
343 | ||
344 | #ifndef GIT_WINDOWS_NATIVE | |
345 | { | |
346 | int notify_pipe[2]; | |
347 | if (pipe(notify_pipe)) | |
348 | notify_pipe[0] = notify_pipe[1] = -1; | |
349 | ||
350 | cmd->pid = fork(); | |
351 | failed_errno = errno; | |
352 | if (!cmd->pid) { | |
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); | |
363 | set_error_routine(error_child); | |
364 | ||
365 | close(notify_pipe[0]); | |
366 | set_cloexec(notify_pipe[1]); | |
367 | child_notifier = notify_pipe[1]; | |
368 | atexit(notify_parent); | |
369 | ||
370 | if (cmd->no_stdin) | |
371 | dup_devnull(0); | |
372 | else if (need_in) { | |
373 | dup2(fdin[0], 0); | |
374 | close_pair(fdin); | |
375 | } else if (cmd->in) { | |
376 | dup2(cmd->in, 0); | |
377 | close(cmd->in); | |
378 | } | |
379 | ||
380 | if (cmd->no_stderr) | |
381 | dup_devnull(2); | |
382 | else if (need_err) { | |
383 | dup2(fderr[1], 2); | |
384 | close_pair(fderr); | |
385 | } else if (cmd->err > 1) { | |
386 | dup2(cmd->err, 2); | |
387 | close(cmd->err); | |
388 | } | |
389 | ||
390 | if (cmd->no_stdout) | |
391 | dup_devnull(1); | |
392 | else if (cmd->stdout_to_stderr) | |
393 | dup2(2, 1); | |
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 | ||
402 | if (cmd->dir && chdir(cmd->dir)) | |
403 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], | |
404 | cmd->dir); | |
405 | if (cmd->env) { | |
406 | for (; *cmd->env; cmd->env++) { | |
407 | if (strchr(*cmd->env, '=')) | |
408 | putenv((char *)*cmd->env); | |
409 | else | |
410 | unsetenv(*cmd->env); | |
411 | } | |
412 | } | |
413 | if (cmd->git_cmd) | |
414 | execv_git_cmd(cmd->argv); | |
415 | else if (cmd->use_shell) | |
416 | execv_shell_cmd(cmd->argv); | |
417 | else | |
418 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); | |
419 | if (errno == ENOENT) { | |
420 | if (!cmd->silent_exec_failure) | |
421 | error("cannot run %s: %s", cmd->argv[0], | |
422 | strerror(ENOENT)); | |
423 | exit(127); | |
424 | } else { | |
425 | die_errno("cannot exec '%s'", cmd->argv[0]); | |
426 | } | |
427 | } | |
428 | if (cmd->pid < 0) | |
429 | error("cannot fork() for %s: %s", cmd->argv[0], | |
430 | strerror(errno)); | |
431 | else if (cmd->clean_on_exit) | |
432 | mark_child_for_cleanup(cmd->pid); | |
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], ¬ify_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 | */ | |
447 | wait_or_whine(cmd->pid, cmd->argv[0]); | |
448 | failed_errno = errno; | |
449 | cmd->pid = -1; | |
450 | } | |
451 | close(notify_pipe[0]); | |
452 | } | |
453 | #else | |
454 | { | |
455 | int fhin = 0, fhout = 1, fherr = 2; | |
456 | const char **sargv = cmd->argv; | |
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->git_cmd) | |
482 | cmd->argv = prepare_git_cmd(cmd->argv); | |
483 | else if (cmd->use_shell) | |
484 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
485 | ||
486 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, | |
487 | cmd->dir, fhin, fhout, fherr); | |
488 | failed_errno = errno; | |
489 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) | |
490 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
491 | if (cmd->clean_on_exit && cmd->pid >= 0) | |
492 | mark_child_for_cleanup(cmd->pid); | |
493 | ||
494 | if (cmd->git_cmd) | |
495 | free(cmd->argv); | |
496 | ||
497 | cmd->argv = sargv; | |
498 | if (fhin != 0) | |
499 | close(fhin); | |
500 | if (fhout != 1) | |
501 | close(fhout); | |
502 | if (fherr != 2) | |
503 | close(fherr); | |
504 | } | |
505 | #endif | |
506 | ||
507 | if (cmd->pid < 0) { | |
508 | if (need_in) | |
509 | close_pair(fdin); | |
510 | else if (cmd->in) | |
511 | close(cmd->in); | |
512 | if (need_out) | |
513 | close_pair(fdout); | |
514 | else if (cmd->out) | |
515 | close(cmd->out); | |
516 | if (need_err) | |
517 | close_pair(fderr); | |
518 | else if (cmd->err) | |
519 | close(cmd->err); | |
520 | argv_array_clear(&cmd->args); | |
521 | errno = failed_errno; | |
522 | return -1; | |
523 | } | |
524 | ||
525 | if (need_in) | |
526 | close(fdin[0]); | |
527 | else if (cmd->in) | |
528 | close(cmd->in); | |
529 | ||
530 | if (need_out) | |
531 | close(fdout[1]); | |
532 | else if (cmd->out) | |
533 | close(cmd->out); | |
534 | ||
535 | if (need_err) | |
536 | close(fderr[1]); | |
537 | else if (cmd->err) | |
538 | close(cmd->err); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | int finish_command(struct child_process *cmd) | |
544 | { | |
545 | int ret = wait_or_whine(cmd->pid, cmd->argv[0]); | |
546 | argv_array_clear(&cmd->args); | |
547 | return ret; | |
548 | } | |
549 | ||
550 | int run_command(struct child_process *cmd) | |
551 | { | |
552 | int code = start_command(cmd); | |
553 | if (code) | |
554 | return code; | |
555 | return finish_command(cmd); | |
556 | } | |
557 | ||
558 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
559 | const char **argv, | |
560 | int opt) | |
561 | { | |
562 | memset(cmd, 0, sizeof(*cmd)); | |
563 | cmd->argv = argv; | |
564 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
565 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
566 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
567 | cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
568 | cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
569 | cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
570 | } | |
571 | ||
572 | int run_command_v_opt(const char **argv, int opt) | |
573 | { | |
574 | struct child_process cmd; | |
575 | prepare_run_command_v_opt(&cmd, argv, opt); | |
576 | return run_command(&cmd); | |
577 | } | |
578 | ||
579 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
580 | { | |
581 | struct child_process cmd; | |
582 | prepare_run_command_v_opt(&cmd, argv, opt); | |
583 | cmd.dir = dir; | |
584 | cmd.env = env; | |
585 | return run_command(&cmd); | |
586 | } | |
587 | ||
588 | #ifndef NO_PTHREADS | |
589 | static pthread_t main_thread; | |
590 | static int main_thread_set; | |
591 | static pthread_key_t async_key; | |
592 | static pthread_key_t async_die_counter; | |
593 | ||
594 | static void *run_thread(void *data) | |
595 | { | |
596 | struct async *async = data; | |
597 | intptr_t ret; | |
598 | ||
599 | pthread_setspecific(async_key, async); | |
600 | ret = async->proc(async->proc_in, async->proc_out, async->data); | |
601 | return (void *)ret; | |
602 | } | |
603 | ||
604 | static NORETURN void die_async(const char *err, va_list params) | |
605 | { | |
606 | vreportf("fatal: ", err, params); | |
607 | ||
608 | if (!pthread_equal(main_thread, pthread_self())) { | |
609 | struct async *async = pthread_getspecific(async_key); | |
610 | if (async->proc_in >= 0) | |
611 | close(async->proc_in); | |
612 | if (async->proc_out >= 0) | |
613 | close(async->proc_out); | |
614 | pthread_exit((void *)128); | |
615 | } | |
616 | ||
617 | exit(128); | |
618 | } | |
619 | ||
620 | static int async_die_is_recursing(void) | |
621 | { | |
622 | void *ret = pthread_getspecific(async_die_counter); | |
623 | pthread_setspecific(async_die_counter, (void *)1); | |
624 | return ret != NULL; | |
625 | } | |
626 | ||
627 | #endif | |
628 | ||
629 | int start_async(struct async *async) | |
630 | { | |
631 | int need_in, need_out; | |
632 | int fdin[2], fdout[2]; | |
633 | int proc_in, proc_out; | |
634 | ||
635 | need_in = async->in < 0; | |
636 | if (need_in) { | |
637 | if (pipe(fdin) < 0) { | |
638 | if (async->out > 0) | |
639 | close(async->out); | |
640 | return error("cannot create pipe: %s", strerror(errno)); | |
641 | } | |
642 | async->in = fdin[1]; | |
643 | } | |
644 | ||
645 | need_out = async->out < 0; | |
646 | if (need_out) { | |
647 | if (pipe(fdout) < 0) { | |
648 | if (need_in) | |
649 | close_pair(fdin); | |
650 | else if (async->in) | |
651 | close(async->in); | |
652 | return error("cannot create pipe: %s", strerror(errno)); | |
653 | } | |
654 | async->out = fdout[0]; | |
655 | } | |
656 | ||
657 | if (need_in) | |
658 | proc_in = fdin[0]; | |
659 | else if (async->in) | |
660 | proc_in = async->in; | |
661 | else | |
662 | proc_in = -1; | |
663 | ||
664 | if (need_out) | |
665 | proc_out = fdout[1]; | |
666 | else if (async->out) | |
667 | proc_out = async->out; | |
668 | else | |
669 | proc_out = -1; | |
670 | ||
671 | #ifdef NO_PTHREADS | |
672 | /* Flush stdio before fork() to avoid cloning buffers */ | |
673 | fflush(NULL); | |
674 | ||
675 | async->pid = fork(); | |
676 | if (async->pid < 0) { | |
677 | error("fork (async) failed: %s", strerror(errno)); | |
678 | goto error; | |
679 | } | |
680 | if (!async->pid) { | |
681 | if (need_in) | |
682 | close(fdin[1]); | |
683 | if (need_out) | |
684 | close(fdout[0]); | |
685 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
686 | } | |
687 | ||
688 | mark_child_for_cleanup(async->pid); | |
689 | ||
690 | if (need_in) | |
691 | close(fdin[0]); | |
692 | else if (async->in) | |
693 | close(async->in); | |
694 | ||
695 | if (need_out) | |
696 | close(fdout[1]); | |
697 | else if (async->out) | |
698 | close(async->out); | |
699 | #else | |
700 | if (!main_thread_set) { | |
701 | /* | |
702 | * We assume that the first time that start_async is called | |
703 | * it is from the main thread. | |
704 | */ | |
705 | main_thread_set = 1; | |
706 | main_thread = pthread_self(); | |
707 | pthread_key_create(&async_key, NULL); | |
708 | pthread_key_create(&async_die_counter, NULL); | |
709 | set_die_routine(die_async); | |
710 | set_die_is_recursing_routine(async_die_is_recursing); | |
711 | } | |
712 | ||
713 | if (proc_in >= 0) | |
714 | set_cloexec(proc_in); | |
715 | if (proc_out >= 0) | |
716 | set_cloexec(proc_out); | |
717 | async->proc_in = proc_in; | |
718 | async->proc_out = proc_out; | |
719 | { | |
720 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
721 | if (err) { | |
722 | error("cannot create thread: %s", strerror(err)); | |
723 | goto error; | |
724 | } | |
725 | } | |
726 | #endif | |
727 | return 0; | |
728 | ||
729 | error: | |
730 | if (need_in) | |
731 | close_pair(fdin); | |
732 | else if (async->in) | |
733 | close(async->in); | |
734 | ||
735 | if (need_out) | |
736 | close_pair(fdout); | |
737 | else if (async->out) | |
738 | close(async->out); | |
739 | return -1; | |
740 | } | |
741 | ||
742 | int finish_async(struct async *async) | |
743 | { | |
744 | #ifdef NO_PTHREADS | |
745 | return wait_or_whine(async->pid, "child process"); | |
746 | #else | |
747 | void *ret = (void *)(intptr_t)(-1); | |
748 | ||
749 | if (pthread_join(async->tid, &ret)) | |
750 | error("pthread_join failed"); | |
751 | return (int)(intptr_t)ret; | |
752 | #endif | |
753 | } | |
754 | ||
755 | char *find_hook(const char *name) | |
756 | { | |
757 | char *path = git_path("hooks/%s", name); | |
758 | if (access(path, X_OK) < 0) | |
759 | path = NULL; | |
760 | ||
761 | return path; | |
762 | } | |
763 | ||
764 | int run_hook_ve(const char *const *env, const char *name, va_list args) | |
765 | { | |
766 | struct child_process hook; | |
767 | const char *p; | |
768 | ||
769 | p = find_hook(name); | |
770 | if (!p) | |
771 | return 0; | |
772 | ||
773 | memset(&hook, 0, sizeof(hook)); | |
774 | argv_array_push(&hook.args, p); | |
775 | while ((p = va_arg(args, const char *))) | |
776 | argv_array_push(&hook.args, p); | |
777 | hook.env = env; | |
778 | hook.no_stdin = 1; | |
779 | hook.stdout_to_stderr = 1; | |
780 | ||
781 | return run_command(&hook); | |
782 | } | |
783 | ||
784 | int run_hook_le(const char *const *env, const char *name, ...) | |
785 | { | |
786 | va_list args; | |
787 | int ret; | |
788 | ||
789 | va_start(args, name); | |
790 | ret = run_hook_ve(env, name, args); | |
791 | va_end(args); | |
792 | ||
793 | return ret; | |
794 | } | |
795 | ||
796 | int run_hook_with_custom_index(const char *index_file, const char *name, ...) | |
797 | { | |
798 | const char *hook_env[3] = { NULL }; | |
799 | char index[PATH_MAX]; | |
800 | va_list args; | |
801 | int ret; | |
802 | ||
803 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
804 | hook_env[0] = index; | |
805 | ||
806 | va_start(args, name); | |
807 | ret = run_hook_ve(hook_env, name, args); | |
808 | va_end(args); | |
809 | ||
810 | return ret; | |
811 | } |