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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 | argv_array_init(&child->env_array); | |
16 | } | |
17 | ||
18 | struct child_to_clean { | |
19 | pid_t pid; | |
20 | struct child_to_clean *next; | |
21 | }; | |
22 | static struct child_to_clean *children_to_clean; | |
23 | static int installed_child_cleanup_handler; | |
24 | ||
25 | static void cleanup_children(int sig) | |
26 | { | |
27 | while (children_to_clean) { | |
28 | struct child_to_clean *p = children_to_clean; | |
29 | children_to_clean = p->next; | |
30 | kill(p->pid, sig); | |
31 | free(p); | |
32 | } | |
33 | } | |
34 | ||
35 | static void cleanup_children_on_signal(int sig) | |
36 | { | |
37 | cleanup_children(sig); | |
38 | sigchain_pop(sig); | |
39 | raise(sig); | |
40 | } | |
41 | ||
42 | static void cleanup_children_on_exit(void) | |
43 | { | |
44 | cleanup_children(SIGTERM); | |
45 | } | |
46 | ||
47 | static void mark_child_for_cleanup(pid_t pid) | |
48 | { | |
49 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
50 | p->pid = pid; | |
51 | p->next = children_to_clean; | |
52 | children_to_clean = p; | |
53 | ||
54 | if (!installed_child_cleanup_handler) { | |
55 | atexit(cleanup_children_on_exit); | |
56 | sigchain_push_common(cleanup_children_on_signal); | |
57 | installed_child_cleanup_handler = 1; | |
58 | } | |
59 | } | |
60 | ||
61 | static void clear_child_for_cleanup(pid_t pid) | |
62 | { | |
63 | struct child_to_clean **pp; | |
64 | ||
65 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { | |
66 | struct child_to_clean *clean_me = *pp; | |
67 | ||
68 | if (clean_me->pid == pid) { | |
69 | *pp = clean_me->next; | |
70 | free(clean_me); | |
71 | return; | |
72 | } | |
73 | } | |
74 | } | |
75 | ||
76 | static inline void close_pair(int fd[2]) | |
77 | { | |
78 | close(fd[0]); | |
79 | close(fd[1]); | |
80 | } | |
81 | ||
82 | #ifndef GIT_WINDOWS_NATIVE | |
83 | static inline void dup_devnull(int to) | |
84 | { | |
85 | int fd = open("/dev/null", O_RDWR); | |
86 | if (fd < 0) | |
87 | die_errno(_("open /dev/null failed")); | |
88 | if (dup2(fd, to) < 0) | |
89 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
90 | close(fd); | |
91 | } | |
92 | #endif | |
93 | ||
94 | static char *locate_in_PATH(const char *file) | |
95 | { | |
96 | const char *p = getenv("PATH"); | |
97 | struct strbuf buf = STRBUF_INIT; | |
98 | ||
99 | if (!p || !*p) | |
100 | return NULL; | |
101 | ||
102 | while (1) { | |
103 | const char *end = strchrnul(p, ':'); | |
104 | ||
105 | strbuf_reset(&buf); | |
106 | ||
107 | /* POSIX specifies an empty entry as the current directory. */ | |
108 | if (end != p) { | |
109 | strbuf_add(&buf, p, end - p); | |
110 | strbuf_addch(&buf, '/'); | |
111 | } | |
112 | strbuf_addstr(&buf, file); | |
113 | ||
114 | if (!access(buf.buf, F_OK)) | |
115 | return strbuf_detach(&buf, NULL); | |
116 | ||
117 | if (!*end) | |
118 | break; | |
119 | p = end + 1; | |
120 | } | |
121 | ||
122 | strbuf_release(&buf); | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | static int exists_in_PATH(const char *file) | |
127 | { | |
128 | char *r = locate_in_PATH(file); | |
129 | free(r); | |
130 | return r != NULL; | |
131 | } | |
132 | ||
133 | int sane_execvp(const char *file, char * const argv[]) | |
134 | { | |
135 | if (!execvp(file, argv)) | |
136 | return 0; /* cannot happen ;-) */ | |
137 | ||
138 | /* | |
139 | * When a command can't be found because one of the directories | |
140 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
141 | * careful usability testing (read: analysis of occasional bug | |
142 | * reports) reveals that "No such file or directory" is more | |
143 | * intuitive. | |
144 | * | |
145 | * We avoid commands with "/", because execvp will not do $PATH | |
146 | * lookups in that case. | |
147 | * | |
148 | * The reassignment of EACCES to errno looks like a no-op below, | |
149 | * but we need to protect against exists_in_PATH overwriting errno. | |
150 | */ | |
151 | if (errno == EACCES && !strchr(file, '/')) | |
152 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
153 | else if (errno == ENOTDIR && !strchr(file, '/')) | |
154 | errno = ENOENT; | |
155 | return -1; | |
156 | } | |
157 | ||
158 | static const char **prepare_shell_cmd(const char **argv) | |
159 | { | |
160 | int argc, nargc = 0; | |
161 | const char **nargv; | |
162 | ||
163 | for (argc = 0; argv[argc]; argc++) | |
164 | ; /* just counting */ | |
165 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
166 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
167 | ||
168 | if (argc < 1) | |
169 | die("BUG: shell command is empty"); | |
170 | ||
171 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { | |
172 | #ifndef GIT_WINDOWS_NATIVE | |
173 | nargv[nargc++] = SHELL_PATH; | |
174 | #else | |
175 | nargv[nargc++] = "sh"; | |
176 | #endif | |
177 | nargv[nargc++] = "-c"; | |
178 | ||
179 | if (argc < 2) | |
180 | nargv[nargc++] = argv[0]; | |
181 | else { | |
182 | struct strbuf arg0 = STRBUF_INIT; | |
183 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
184 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
185 | } | |
186 | } | |
187 | ||
188 | for (argc = 0; argv[argc]; argc++) | |
189 | nargv[nargc++] = argv[argc]; | |
190 | nargv[nargc] = NULL; | |
191 | ||
192 | return nargv; | |
193 | } | |
194 | ||
195 | #ifndef GIT_WINDOWS_NATIVE | |
196 | static int execv_shell_cmd(const char **argv) | |
197 | { | |
198 | const char **nargv = prepare_shell_cmd(argv); | |
199 | trace_argv_printf(nargv, "trace: exec:"); | |
200 | sane_execvp(nargv[0], (char **)nargv); | |
201 | free(nargv); | |
202 | return -1; | |
203 | } | |
204 | #endif | |
205 | ||
206 | #ifndef GIT_WINDOWS_NATIVE | |
207 | static int child_err = 2; | |
208 | static int child_notifier = -1; | |
209 | ||
210 | static void notify_parent(void) | |
211 | { | |
212 | /* | |
213 | * execvp failed. If possible, we'd like to let start_command | |
214 | * know, so failures like ENOENT can be handled right away; but | |
215 | * otherwise, finish_command will still report the error. | |
216 | */ | |
217 | xwrite(child_notifier, "", 1); | |
218 | } | |
219 | ||
220 | static NORETURN void die_child(const char *err, va_list params) | |
221 | { | |
222 | vwritef(child_err, "fatal: ", err, params); | |
223 | exit(128); | |
224 | } | |
225 | ||
226 | static void error_child(const char *err, va_list params) | |
227 | { | |
228 | vwritef(child_err, "error: ", err, params); | |
229 | } | |
230 | #endif | |
231 | ||
232 | static inline void set_cloexec(int fd) | |
233 | { | |
234 | int flags = fcntl(fd, F_GETFD); | |
235 | if (flags >= 0) | |
236 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
237 | } | |
238 | ||
239 | static int wait_or_whine(pid_t pid, const char *argv0) | |
240 | { | |
241 | int status, code = -1; | |
242 | pid_t waiting; | |
243 | int failed_errno = 0; | |
244 | ||
245 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
246 | ; /* nothing */ | |
247 | ||
248 | if (waiting < 0) { | |
249 | failed_errno = errno; | |
250 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
251 | } else if (waiting != pid) { | |
252 | error("waitpid is confused (%s)", argv0); | |
253 | } else if (WIFSIGNALED(status)) { | |
254 | code = WTERMSIG(status); | |
255 | if (code != SIGINT && code != SIGQUIT) | |
256 | error("%s died of signal %d", argv0, code); | |
257 | /* | |
258 | * This return value is chosen so that code & 0xff | |
259 | * mimics the exit code that a POSIX shell would report for | |
260 | * a program that died from this signal. | |
261 | */ | |
262 | code += 128; | |
263 | } else if (WIFEXITED(status)) { | |
264 | code = WEXITSTATUS(status); | |
265 | /* | |
266 | * Convert special exit code when execvp failed. | |
267 | */ | |
268 | if (code == 127) { | |
269 | code = -1; | |
270 | failed_errno = ENOENT; | |
271 | } | |
272 | } else { | |
273 | error("waitpid is confused (%s)", argv0); | |
274 | } | |
275 | ||
276 | clear_child_for_cleanup(pid); | |
277 | ||
278 | errno = failed_errno; | |
279 | return code; | |
280 | } | |
281 | ||
282 | int start_command(struct child_process *cmd) | |
283 | { | |
284 | int need_in, need_out, need_err; | |
285 | int fdin[2], fdout[2], fderr[2]; | |
286 | int failed_errno; | |
287 | char *str; | |
288 | ||
289 | if (!cmd->argv) | |
290 | cmd->argv = cmd->args.argv; | |
291 | if (!cmd->env) | |
292 | cmd->env = cmd->env_array.argv; | |
293 | ||
294 | /* | |
295 | * In case of errors we must keep the promise to close FDs | |
296 | * that have been passed in via ->in and ->out. | |
297 | */ | |
298 | ||
299 | need_in = !cmd->no_stdin && cmd->in < 0; | |
300 | if (need_in) { | |
301 | if (pipe(fdin) < 0) { | |
302 | failed_errno = errno; | |
303 | if (cmd->out > 0) | |
304 | close(cmd->out); | |
305 | str = "standard input"; | |
306 | goto fail_pipe; | |
307 | } | |
308 | cmd->in = fdin[1]; | |
309 | } | |
310 | ||
311 | need_out = !cmd->no_stdout | |
312 | && !cmd->stdout_to_stderr | |
313 | && cmd->out < 0; | |
314 | if (need_out) { | |
315 | if (pipe(fdout) < 0) { | |
316 | failed_errno = errno; | |
317 | if (need_in) | |
318 | close_pair(fdin); | |
319 | else if (cmd->in) | |
320 | close(cmd->in); | |
321 | str = "standard output"; | |
322 | goto fail_pipe; | |
323 | } | |
324 | cmd->out = fdout[0]; | |
325 | } | |
326 | ||
327 | need_err = !cmd->no_stderr && cmd->err < 0; | |
328 | if (need_err) { | |
329 | if (pipe(fderr) < 0) { | |
330 | failed_errno = errno; | |
331 | if (need_in) | |
332 | close_pair(fdin); | |
333 | else if (cmd->in) | |
334 | close(cmd->in); | |
335 | if (need_out) | |
336 | close_pair(fdout); | |
337 | else if (cmd->out) | |
338 | close(cmd->out); | |
339 | str = "standard error"; | |
340 | fail_pipe: | |
341 | error("cannot create %s pipe for %s: %s", | |
342 | str, cmd->argv[0], strerror(failed_errno)); | |
343 | argv_array_clear(&cmd->args); | |
344 | argv_array_clear(&cmd->env_array); | |
345 | errno = failed_errno; | |
346 | return -1; | |
347 | } | |
348 | cmd->err = fderr[0]; | |
349 | } | |
350 | ||
351 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
352 | fflush(NULL); | |
353 | ||
354 | #ifndef GIT_WINDOWS_NATIVE | |
355 | { | |
356 | int notify_pipe[2]; | |
357 | if (pipe(notify_pipe)) | |
358 | notify_pipe[0] = notify_pipe[1] = -1; | |
359 | ||
360 | cmd->pid = fork(); | |
361 | failed_errno = errno; | |
362 | if (!cmd->pid) { | |
363 | /* | |
364 | * Redirect the channel to write syscall error messages to | |
365 | * before redirecting the process's stderr so that all die() | |
366 | * in subsequent call paths use the parent's stderr. | |
367 | */ | |
368 | if (cmd->no_stderr || need_err) { | |
369 | child_err = dup(2); | |
370 | set_cloexec(child_err); | |
371 | } | |
372 | set_die_routine(die_child); | |
373 | set_error_routine(error_child); | |
374 | ||
375 | close(notify_pipe[0]); | |
376 | set_cloexec(notify_pipe[1]); | |
377 | child_notifier = notify_pipe[1]; | |
378 | atexit(notify_parent); | |
379 | ||
380 | if (cmd->no_stdin) | |
381 | dup_devnull(0); | |
382 | else if (need_in) { | |
383 | dup2(fdin[0], 0); | |
384 | close_pair(fdin); | |
385 | } else if (cmd->in) { | |
386 | dup2(cmd->in, 0); | |
387 | close(cmd->in); | |
388 | } | |
389 | ||
390 | if (cmd->no_stderr) | |
391 | dup_devnull(2); | |
392 | else if (need_err) { | |
393 | dup2(fderr[1], 2); | |
394 | close_pair(fderr); | |
395 | } else if (cmd->err > 1) { | |
396 | dup2(cmd->err, 2); | |
397 | close(cmd->err); | |
398 | } | |
399 | ||
400 | if (cmd->no_stdout) | |
401 | dup_devnull(1); | |
402 | else if (cmd->stdout_to_stderr) | |
403 | dup2(2, 1); | |
404 | else if (need_out) { | |
405 | dup2(fdout[1], 1); | |
406 | close_pair(fdout); | |
407 | } else if (cmd->out > 1) { | |
408 | dup2(cmd->out, 1); | |
409 | close(cmd->out); | |
410 | } | |
411 | ||
412 | if (cmd->dir && chdir(cmd->dir)) | |
413 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], | |
414 | cmd->dir); | |
415 | if (cmd->env) { | |
416 | for (; *cmd->env; cmd->env++) { | |
417 | if (strchr(*cmd->env, '=')) | |
418 | putenv((char *)*cmd->env); | |
419 | else | |
420 | unsetenv(*cmd->env); | |
421 | } | |
422 | } | |
423 | if (cmd->git_cmd) | |
424 | execv_git_cmd(cmd->argv); | |
425 | else if (cmd->use_shell) | |
426 | execv_shell_cmd(cmd->argv); | |
427 | else | |
428 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); | |
429 | if (errno == ENOENT) { | |
430 | if (!cmd->silent_exec_failure) | |
431 | error("cannot run %s: %s", cmd->argv[0], | |
432 | strerror(ENOENT)); | |
433 | exit(127); | |
434 | } else { | |
435 | die_errno("cannot exec '%s'", cmd->argv[0]); | |
436 | } | |
437 | } | |
438 | if (cmd->pid < 0) | |
439 | error("cannot fork() for %s: %s", cmd->argv[0], | |
440 | strerror(errno)); | |
441 | else if (cmd->clean_on_exit) | |
442 | mark_child_for_cleanup(cmd->pid); | |
443 | ||
444 | /* | |
445 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
446 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
447 | * child process sends a single byte. | |
448 | * Note that use of this infrastructure is completely advisory, | |
449 | * therefore, we keep error checks minimal. | |
450 | */ | |
451 | close(notify_pipe[1]); | |
452 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
453 | /* | |
454 | * At this point we know that fork() succeeded, but execvp() | |
455 | * failed. Errors have been reported to our stderr. | |
456 | */ | |
457 | wait_or_whine(cmd->pid, cmd->argv[0]); | |
458 | failed_errno = errno; | |
459 | cmd->pid = -1; | |
460 | } | |
461 | close(notify_pipe[0]); | |
462 | } | |
463 | #else | |
464 | { | |
465 | int fhin = 0, fhout = 1, fherr = 2; | |
466 | const char **sargv = cmd->argv; | |
467 | ||
468 | if (cmd->no_stdin) | |
469 | fhin = open("/dev/null", O_RDWR); | |
470 | else if (need_in) | |
471 | fhin = dup(fdin[0]); | |
472 | else if (cmd->in) | |
473 | fhin = dup(cmd->in); | |
474 | ||
475 | if (cmd->no_stderr) | |
476 | fherr = open("/dev/null", O_RDWR); | |
477 | else if (need_err) | |
478 | fherr = dup(fderr[1]); | |
479 | else if (cmd->err > 2) | |
480 | fherr = dup(cmd->err); | |
481 | ||
482 | if (cmd->no_stdout) | |
483 | fhout = open("/dev/null", O_RDWR); | |
484 | else if (cmd->stdout_to_stderr) | |
485 | fhout = dup(fherr); | |
486 | else if (need_out) | |
487 | fhout = dup(fdout[1]); | |
488 | else if (cmd->out > 1) | |
489 | fhout = dup(cmd->out); | |
490 | ||
491 | if (cmd->git_cmd) | |
492 | cmd->argv = prepare_git_cmd(cmd->argv); | |
493 | else if (cmd->use_shell) | |
494 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
495 | ||
496 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, | |
497 | cmd->dir, fhin, fhout, fherr); | |
498 | failed_errno = errno; | |
499 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) | |
500 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
501 | if (cmd->clean_on_exit && cmd->pid >= 0) | |
502 | mark_child_for_cleanup(cmd->pid); | |
503 | ||
504 | if (cmd->git_cmd) | |
505 | free(cmd->argv); | |
506 | ||
507 | cmd->argv = sargv; | |
508 | if (fhin != 0) | |
509 | close(fhin); | |
510 | if (fhout != 1) | |
511 | close(fhout); | |
512 | if (fherr != 2) | |
513 | close(fherr); | |
514 | } | |
515 | #endif | |
516 | ||
517 | if (cmd->pid < 0) { | |
518 | if (need_in) | |
519 | close_pair(fdin); | |
520 | else if (cmd->in) | |
521 | close(cmd->in); | |
522 | if (need_out) | |
523 | close_pair(fdout); | |
524 | else if (cmd->out) | |
525 | close(cmd->out); | |
526 | if (need_err) | |
527 | close_pair(fderr); | |
528 | else if (cmd->err) | |
529 | close(cmd->err); | |
530 | argv_array_clear(&cmd->args); | |
531 | argv_array_clear(&cmd->env_array); | |
532 | errno = failed_errno; | |
533 | return -1; | |
534 | } | |
535 | ||
536 | if (need_in) | |
537 | close(fdin[0]); | |
538 | else if (cmd->in) | |
539 | close(cmd->in); | |
540 | ||
541 | if (need_out) | |
542 | close(fdout[1]); | |
543 | else if (cmd->out) | |
544 | close(cmd->out); | |
545 | ||
546 | if (need_err) | |
547 | close(fderr[1]); | |
548 | else if (cmd->err) | |
549 | close(cmd->err); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | int finish_command(struct child_process *cmd) | |
555 | { | |
556 | int ret = wait_or_whine(cmd->pid, cmd->argv[0]); | |
557 | argv_array_clear(&cmd->args); | |
558 | argv_array_clear(&cmd->env_array); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | int run_command(struct child_process *cmd) | |
563 | { | |
564 | int code = start_command(cmd); | |
565 | if (code) | |
566 | return code; | |
567 | return finish_command(cmd); | |
568 | } | |
569 | ||
570 | int run_command_v_opt(const char **argv, int opt) | |
571 | { | |
572 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); | |
573 | } | |
574 | ||
575 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
576 | { | |
577 | struct child_process cmd = CHILD_PROCESS_INIT; | |
578 | cmd.argv = argv; | |
579 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
580 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
581 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
582 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
583 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
584 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
585 | cmd.dir = dir; | |
586 | cmd.env = env; | |
587 | return run_command(&cmd); | |
588 | } | |
589 | ||
590 | #ifndef NO_PTHREADS | |
591 | static pthread_t main_thread; | |
592 | static int main_thread_set; | |
593 | static pthread_key_t async_key; | |
594 | static pthread_key_t async_die_counter; | |
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 | ||
622 | static 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 | ||
629 | #else | |
630 | ||
631 | static struct { | |
632 | void (**handlers)(void); | |
633 | size_t nr; | |
634 | size_t alloc; | |
635 | } git_atexit_hdlrs; | |
636 | ||
637 | static int git_atexit_installed; | |
638 | ||
639 | static void git_atexit_dispatch(void) | |
640 | { | |
641 | size_t i; | |
642 | ||
643 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
644 | git_atexit_hdlrs.handlers[i-1](); | |
645 | } | |
646 | ||
647 | static void git_atexit_clear(void) | |
648 | { | |
649 | free(git_atexit_hdlrs.handlers); | |
650 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
651 | git_atexit_installed = 0; | |
652 | } | |
653 | ||
654 | #undef atexit | |
655 | int git_atexit(void (*handler)(void)) | |
656 | { | |
657 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
658 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
659 | if (!git_atexit_installed) { | |
660 | if (atexit(&git_atexit_dispatch)) | |
661 | return -1; | |
662 | git_atexit_installed = 1; | |
663 | } | |
664 | return 0; | |
665 | } | |
666 | #define atexit git_atexit | |
667 | ||
668 | #endif | |
669 | ||
670 | int start_async(struct async *async) | |
671 | { | |
672 | int need_in, need_out; | |
673 | int fdin[2], fdout[2]; | |
674 | int proc_in, proc_out; | |
675 | ||
676 | need_in = async->in < 0; | |
677 | if (need_in) { | |
678 | if (pipe(fdin) < 0) { | |
679 | if (async->out > 0) | |
680 | close(async->out); | |
681 | return error("cannot create pipe: %s", strerror(errno)); | |
682 | } | |
683 | async->in = fdin[1]; | |
684 | } | |
685 | ||
686 | need_out = async->out < 0; | |
687 | if (need_out) { | |
688 | if (pipe(fdout) < 0) { | |
689 | if (need_in) | |
690 | close_pair(fdin); | |
691 | else if (async->in) | |
692 | close(async->in); | |
693 | return error("cannot create pipe: %s", strerror(errno)); | |
694 | } | |
695 | async->out = fdout[0]; | |
696 | } | |
697 | ||
698 | if (need_in) | |
699 | proc_in = fdin[0]; | |
700 | else if (async->in) | |
701 | proc_in = async->in; | |
702 | else | |
703 | proc_in = -1; | |
704 | ||
705 | if (need_out) | |
706 | proc_out = fdout[1]; | |
707 | else if (async->out) | |
708 | proc_out = async->out; | |
709 | else | |
710 | proc_out = -1; | |
711 | ||
712 | #ifdef NO_PTHREADS | |
713 | /* Flush stdio before fork() to avoid cloning buffers */ | |
714 | fflush(NULL); | |
715 | ||
716 | async->pid = fork(); | |
717 | if (async->pid < 0) { | |
718 | error("fork (async) failed: %s", strerror(errno)); | |
719 | goto error; | |
720 | } | |
721 | if (!async->pid) { | |
722 | if (need_in) | |
723 | close(fdin[1]); | |
724 | if (need_out) | |
725 | close(fdout[0]); | |
726 | git_atexit_clear(); | |
727 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
728 | } | |
729 | ||
730 | mark_child_for_cleanup(async->pid); | |
731 | ||
732 | if (need_in) | |
733 | close(fdin[0]); | |
734 | else if (async->in) | |
735 | close(async->in); | |
736 | ||
737 | if (need_out) | |
738 | close(fdout[1]); | |
739 | else if (async->out) | |
740 | close(async->out); | |
741 | #else | |
742 | if (!main_thread_set) { | |
743 | /* | |
744 | * We assume that the first time that start_async is called | |
745 | * it is from the main thread. | |
746 | */ | |
747 | main_thread_set = 1; | |
748 | main_thread = pthread_self(); | |
749 | pthread_key_create(&async_key, NULL); | |
750 | pthread_key_create(&async_die_counter, NULL); | |
751 | set_die_routine(die_async); | |
752 | set_die_is_recursing_routine(async_die_is_recursing); | |
753 | } | |
754 | ||
755 | if (proc_in >= 0) | |
756 | set_cloexec(proc_in); | |
757 | if (proc_out >= 0) | |
758 | set_cloexec(proc_out); | |
759 | async->proc_in = proc_in; | |
760 | async->proc_out = proc_out; | |
761 | { | |
762 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
763 | if (err) { | |
764 | error("cannot create thread: %s", strerror(err)); | |
765 | goto error; | |
766 | } | |
767 | } | |
768 | #endif | |
769 | return 0; | |
770 | ||
771 | error: | |
772 | if (need_in) | |
773 | close_pair(fdin); | |
774 | else if (async->in) | |
775 | close(async->in); | |
776 | ||
777 | if (need_out) | |
778 | close_pair(fdout); | |
779 | else if (async->out) | |
780 | close(async->out); | |
781 | return -1; | |
782 | } | |
783 | ||
784 | int finish_async(struct async *async) | |
785 | { | |
786 | #ifdef NO_PTHREADS | |
787 | return wait_or_whine(async->pid, "child process"); | |
788 | #else | |
789 | void *ret = (void *)(intptr_t)(-1); | |
790 | ||
791 | if (pthread_join(async->tid, &ret)) | |
792 | error("pthread_join failed"); | |
793 | return (int)(intptr_t)ret; | |
794 | #endif | |
795 | } | |
796 | ||
797 | char *find_hook(const char *name) | |
798 | { | |
799 | char *path = git_path("hooks/%s", name); | |
800 | if (access(path, X_OK) < 0) | |
801 | path = NULL; | |
802 | ||
803 | return path; | |
804 | } | |
805 | ||
806 | int run_hook_ve(const char *const *env, const char *name, va_list args) | |
807 | { | |
808 | struct child_process hook = CHILD_PROCESS_INIT; | |
809 | const char *p; | |
810 | ||
811 | p = find_hook(name); | |
812 | if (!p) | |
813 | return 0; | |
814 | ||
815 | argv_array_push(&hook.args, p); | |
816 | while ((p = va_arg(args, const char *))) | |
817 | argv_array_push(&hook.args, p); | |
818 | hook.env = env; | |
819 | hook.no_stdin = 1; | |
820 | hook.stdout_to_stderr = 1; | |
821 | ||
822 | return run_command(&hook); | |
823 | } | |
824 | ||
825 | int run_hook_le(const char *const *env, const char *name, ...) | |
826 | { | |
827 | va_list args; | |
828 | int ret; | |
829 | ||
830 | va_start(args, name); | |
831 | ret = run_hook_ve(env, name, args); | |
832 | va_end(args); | |
833 | ||
834 | return ret; | |
835 | } |