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1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
4 | ||
5 | static inline void close_pair(int fd[2]) | |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
11 | #ifndef WIN32 | |
12 | static inline void dup_devnull(int to) | |
13 | { | |
14 | int fd = open("/dev/null", O_RDWR); | |
15 | dup2(fd, to); | |
16 | close(fd); | |
17 | } | |
18 | #endif | |
19 | ||
20 | static const char **prepare_shell_cmd(const char **argv) | |
21 | { | |
22 | int argc, nargc = 0; | |
23 | const char **nargv; | |
24 | ||
25 | for (argc = 0; argv[argc]; argc++) | |
26 | ; /* just counting */ | |
27 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
28 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
29 | ||
30 | if (argc < 1) | |
31 | die("BUG: shell command is empty"); | |
32 | ||
33 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { | |
34 | nargv[nargc++] = "sh"; | |
35 | nargv[nargc++] = "-c"; | |
36 | ||
37 | if (argc < 2) | |
38 | nargv[nargc++] = argv[0]; | |
39 | else { | |
40 | struct strbuf arg0 = STRBUF_INIT; | |
41 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
42 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
43 | } | |
44 | } | |
45 | ||
46 | for (argc = 0; argv[argc]; argc++) | |
47 | nargv[nargc++] = argv[argc]; | |
48 | nargv[nargc] = NULL; | |
49 | ||
50 | return nargv; | |
51 | } | |
52 | ||
53 | #ifndef WIN32 | |
54 | static int execv_shell_cmd(const char **argv) | |
55 | { | |
56 | const char **nargv = prepare_shell_cmd(argv); | |
57 | trace_argv_printf(nargv, "trace: exec:"); | |
58 | execvp(nargv[0], (char **)nargv); | |
59 | free(nargv); | |
60 | return -1; | |
61 | } | |
62 | #endif | |
63 | ||
64 | #ifndef WIN32 | |
65 | static int child_err = 2; | |
66 | static int child_notifier = -1; | |
67 | ||
68 | static void notify_parent(void) | |
69 | { | |
70 | ssize_t unused; | |
71 | unused = write(child_notifier, "", 1); | |
72 | } | |
73 | ||
74 | static NORETURN void die_child(const char *err, va_list params) | |
75 | { | |
76 | char msg[4096]; | |
77 | ssize_t unused; | |
78 | int len = vsnprintf(msg, sizeof(msg), err, params); | |
79 | if (len > sizeof(msg)) | |
80 | len = sizeof(msg); | |
81 | ||
82 | unused = write(child_err, "fatal: ", 7); | |
83 | unused = write(child_err, msg, len); | |
84 | unused = write(child_err, "\n", 1); | |
85 | exit(128); | |
86 | } | |
87 | ||
88 | static inline void set_cloexec(int fd) | |
89 | { | |
90 | int flags = fcntl(fd, F_GETFD); | |
91 | if (flags >= 0) | |
92 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
93 | } | |
94 | #endif | |
95 | ||
96 | static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure) | |
97 | { | |
98 | int status, code = -1; | |
99 | pid_t waiting; | |
100 | int failed_errno = 0; | |
101 | ||
102 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
103 | ; /* nothing */ | |
104 | ||
105 | if (waiting < 0) { | |
106 | failed_errno = errno; | |
107 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
108 | } else if (waiting != pid) { | |
109 | error("waitpid is confused (%s)", argv0); | |
110 | } else if (WIFSIGNALED(status)) { | |
111 | code = WTERMSIG(status); | |
112 | error("%s died of signal %d", argv0, code); | |
113 | /* | |
114 | * This return value is chosen so that code & 0xff | |
115 | * mimics the exit code that a POSIX shell would report for | |
116 | * a program that died from this signal. | |
117 | */ | |
118 | code -= 128; | |
119 | } else if (WIFEXITED(status)) { | |
120 | code = WEXITSTATUS(status); | |
121 | /* | |
122 | * Convert special exit code when execvp failed. | |
123 | */ | |
124 | if (code == 127) { | |
125 | code = -1; | |
126 | failed_errno = ENOENT; | |
127 | if (!silent_exec_failure) | |
128 | error("cannot run %s: %s", argv0, | |
129 | strerror(ENOENT)); | |
130 | } | |
131 | } else { | |
132 | error("waitpid is confused (%s)", argv0); | |
133 | } | |
134 | errno = failed_errno; | |
135 | return code; | |
136 | } | |
137 | ||
138 | int start_command(struct child_process *cmd) | |
139 | { | |
140 | int need_in, need_out, need_err; | |
141 | int fdin[2], fdout[2], fderr[2]; | |
142 | int failed_errno = failed_errno; | |
143 | ||
144 | /* | |
145 | * In case of errors we must keep the promise to close FDs | |
146 | * that have been passed in via ->in and ->out. | |
147 | */ | |
148 | ||
149 | need_in = !cmd->no_stdin && cmd->in < 0; | |
150 | if (need_in) { | |
151 | if (pipe(fdin) < 0) { | |
152 | failed_errno = errno; | |
153 | if (cmd->out > 0) | |
154 | close(cmd->out); | |
155 | goto fail_pipe; | |
156 | } | |
157 | cmd->in = fdin[1]; | |
158 | } | |
159 | ||
160 | need_out = !cmd->no_stdout | |
161 | && !cmd->stdout_to_stderr | |
162 | && cmd->out < 0; | |
163 | if (need_out) { | |
164 | if (pipe(fdout) < 0) { | |
165 | failed_errno = errno; | |
166 | if (need_in) | |
167 | close_pair(fdin); | |
168 | else if (cmd->in) | |
169 | close(cmd->in); | |
170 | goto fail_pipe; | |
171 | } | |
172 | cmd->out = fdout[0]; | |
173 | } | |
174 | ||
175 | need_err = !cmd->no_stderr && cmd->err < 0; | |
176 | if (need_err) { | |
177 | if (pipe(fderr) < 0) { | |
178 | failed_errno = errno; | |
179 | if (need_in) | |
180 | close_pair(fdin); | |
181 | else if (cmd->in) | |
182 | close(cmd->in); | |
183 | if (need_out) | |
184 | close_pair(fdout); | |
185 | else if (cmd->out) | |
186 | close(cmd->out); | |
187 | fail_pipe: | |
188 | error("cannot create pipe for %s: %s", | |
189 | cmd->argv[0], strerror(failed_errno)); | |
190 | errno = failed_errno; | |
191 | return -1; | |
192 | } | |
193 | cmd->err = fderr[0]; | |
194 | } | |
195 | ||
196 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
197 | ||
198 | #ifndef WIN32 | |
199 | { | |
200 | int notify_pipe[2]; | |
201 | if (pipe(notify_pipe)) | |
202 | notify_pipe[0] = notify_pipe[1] = -1; | |
203 | ||
204 | fflush(NULL); | |
205 | cmd->pid = fork(); | |
206 | if (!cmd->pid) { | |
207 | /* | |
208 | * Redirect the channel to write syscall error messages to | |
209 | * before redirecting the process's stderr so that all die() | |
210 | * in subsequent call paths use the parent's stderr. | |
211 | */ | |
212 | if (cmd->no_stderr || need_err) { | |
213 | child_err = dup(2); | |
214 | set_cloexec(child_err); | |
215 | } | |
216 | set_die_routine(die_child); | |
217 | ||
218 | close(notify_pipe[0]); | |
219 | set_cloexec(notify_pipe[1]); | |
220 | child_notifier = notify_pipe[1]; | |
221 | atexit(notify_parent); | |
222 | ||
223 | if (cmd->no_stdin) | |
224 | dup_devnull(0); | |
225 | else if (need_in) { | |
226 | dup2(fdin[0], 0); | |
227 | close_pair(fdin); | |
228 | } else if (cmd->in) { | |
229 | dup2(cmd->in, 0); | |
230 | close(cmd->in); | |
231 | } | |
232 | ||
233 | if (cmd->no_stderr) | |
234 | dup_devnull(2); | |
235 | else if (need_err) { | |
236 | dup2(fderr[1], 2); | |
237 | close_pair(fderr); | |
238 | } else if (cmd->err > 1) { | |
239 | dup2(cmd->err, 2); | |
240 | close(cmd->err); | |
241 | } | |
242 | ||
243 | if (cmd->no_stdout) | |
244 | dup_devnull(1); | |
245 | else if (cmd->stdout_to_stderr) | |
246 | dup2(2, 1); | |
247 | else if (need_out) { | |
248 | dup2(fdout[1], 1); | |
249 | close_pair(fdout); | |
250 | } else if (cmd->out > 1) { | |
251 | dup2(cmd->out, 1); | |
252 | close(cmd->out); | |
253 | } | |
254 | ||
255 | if (cmd->dir && chdir(cmd->dir)) | |
256 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], | |
257 | cmd->dir); | |
258 | if (cmd->env) { | |
259 | for (; *cmd->env; cmd->env++) { | |
260 | if (strchr(*cmd->env, '=')) | |
261 | putenv((char *)*cmd->env); | |
262 | else | |
263 | unsetenv(*cmd->env); | |
264 | } | |
265 | } | |
266 | if (cmd->preexec_cb) { | |
267 | /* | |
268 | * We cannot predict what the pre-exec callback does. | |
269 | * Forgo parent notification. | |
270 | */ | |
271 | close(child_notifier); | |
272 | child_notifier = -1; | |
273 | ||
274 | cmd->preexec_cb(); | |
275 | } | |
276 | if (cmd->git_cmd) { | |
277 | execv_git_cmd(cmd->argv); | |
278 | } else if (cmd->use_shell) { | |
279 | execv_shell_cmd(cmd->argv); | |
280 | } else { | |
281 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
282 | } | |
283 | /* | |
284 | * Do not check for cmd->silent_exec_failure; the parent | |
285 | * process will check it when it sees this exit code. | |
286 | */ | |
287 | if (errno == ENOENT) | |
288 | exit(127); | |
289 | else | |
290 | die_errno("cannot exec '%s'", cmd->argv[0]); | |
291 | } | |
292 | if (cmd->pid < 0) | |
293 | error("cannot fork() for %s: %s", cmd->argv[0], | |
294 | strerror(failed_errno = errno)); | |
295 | ||
296 | /* | |
297 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
298 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
299 | * child process sends a single byte. | |
300 | * Note that use of this infrastructure is completely advisory, | |
301 | * therefore, we keep error checks minimal. | |
302 | */ | |
303 | close(notify_pipe[1]); | |
304 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
305 | /* | |
306 | * At this point we know that fork() succeeded, but execvp() | |
307 | * failed. Errors have been reported to our stderr. | |
308 | */ | |
309 | wait_or_whine(cmd->pid, cmd->argv[0], | |
310 | cmd->silent_exec_failure); | |
311 | failed_errno = errno; | |
312 | cmd->pid = -1; | |
313 | } | |
314 | close(notify_pipe[0]); | |
315 | } | |
316 | #else | |
317 | { | |
318 | int fhin = 0, fhout = 1, fherr = 2; | |
319 | const char **sargv = cmd->argv; | |
320 | char **env = environ; | |
321 | ||
322 | if (cmd->no_stdin) | |
323 | fhin = open("/dev/null", O_RDWR); | |
324 | else if (need_in) | |
325 | fhin = dup(fdin[0]); | |
326 | else if (cmd->in) | |
327 | fhin = dup(cmd->in); | |
328 | ||
329 | if (cmd->no_stderr) | |
330 | fherr = open("/dev/null", O_RDWR); | |
331 | else if (need_err) | |
332 | fherr = dup(fderr[1]); | |
333 | else if (cmd->err > 2) | |
334 | fherr = dup(cmd->err); | |
335 | ||
336 | if (cmd->no_stdout) | |
337 | fhout = open("/dev/null", O_RDWR); | |
338 | else if (cmd->stdout_to_stderr) | |
339 | fhout = dup(fherr); | |
340 | else if (need_out) | |
341 | fhout = dup(fdout[1]); | |
342 | else if (cmd->out > 1) | |
343 | fhout = dup(cmd->out); | |
344 | ||
345 | if (cmd->env) | |
346 | env = make_augmented_environ(cmd->env); | |
347 | ||
348 | if (cmd->git_cmd) { | |
349 | cmd->argv = prepare_git_cmd(cmd->argv); | |
350 | } else if (cmd->use_shell) { | |
351 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
352 | } | |
353 | ||
354 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir, | |
355 | fhin, fhout, fherr); | |
356 | failed_errno = errno; | |
357 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) | |
358 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
359 | ||
360 | if (cmd->env) | |
361 | free_environ(env); | |
362 | if (cmd->git_cmd) | |
363 | free(cmd->argv); | |
364 | ||
365 | cmd->argv = sargv; | |
366 | if (fhin != 0) | |
367 | close(fhin); | |
368 | if (fhout != 1) | |
369 | close(fhout); | |
370 | if (fherr != 2) | |
371 | close(fherr); | |
372 | } | |
373 | #endif | |
374 | ||
375 | if (cmd->pid < 0) { | |
376 | if (need_in) | |
377 | close_pair(fdin); | |
378 | else if (cmd->in) | |
379 | close(cmd->in); | |
380 | if (need_out) | |
381 | close_pair(fdout); | |
382 | else if (cmd->out) | |
383 | close(cmd->out); | |
384 | if (need_err) | |
385 | close_pair(fderr); | |
386 | else if (cmd->err) | |
387 | close(cmd->err); | |
388 | errno = failed_errno; | |
389 | return -1; | |
390 | } | |
391 | ||
392 | if (need_in) | |
393 | close(fdin[0]); | |
394 | else if (cmd->in) | |
395 | close(cmd->in); | |
396 | ||
397 | if (need_out) | |
398 | close(fdout[1]); | |
399 | else if (cmd->out) | |
400 | close(cmd->out); | |
401 | ||
402 | if (need_err) | |
403 | close(fderr[1]); | |
404 | else if (cmd->err) | |
405 | close(cmd->err); | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | int finish_command(struct child_process *cmd) | |
411 | { | |
412 | return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure); | |
413 | } | |
414 | ||
415 | int run_command(struct child_process *cmd) | |
416 | { | |
417 | int code = start_command(cmd); | |
418 | if (code) | |
419 | return code; | |
420 | return finish_command(cmd); | |
421 | } | |
422 | ||
423 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
424 | const char **argv, | |
425 | int opt) | |
426 | { | |
427 | memset(cmd, 0, sizeof(*cmd)); | |
428 | cmd->argv = argv; | |
429 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
430 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
431 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
432 | cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
433 | cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
434 | } | |
435 | ||
436 | int run_command_v_opt(const char **argv, int opt) | |
437 | { | |
438 | struct child_process cmd; | |
439 | prepare_run_command_v_opt(&cmd, argv, opt); | |
440 | return run_command(&cmd); | |
441 | } | |
442 | ||
443 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
444 | { | |
445 | struct child_process cmd; | |
446 | prepare_run_command_v_opt(&cmd, argv, opt); | |
447 | cmd.dir = dir; | |
448 | cmd.env = env; | |
449 | return run_command(&cmd); | |
450 | } | |
451 | ||
452 | #ifdef WIN32 | |
453 | static unsigned __stdcall run_thread(void *data) | |
454 | { | |
455 | struct async *async = data; | |
456 | return async->proc(async->proc_in, async->proc_out, async->data); | |
457 | } | |
458 | #endif | |
459 | ||
460 | int start_async(struct async *async) | |
461 | { | |
462 | int need_in, need_out; | |
463 | int fdin[2], fdout[2]; | |
464 | int proc_in, proc_out; | |
465 | ||
466 | need_in = async->in < 0; | |
467 | if (need_in) { | |
468 | if (pipe(fdin) < 0) { | |
469 | if (async->out > 0) | |
470 | close(async->out); | |
471 | return error("cannot create pipe: %s", strerror(errno)); | |
472 | } | |
473 | async->in = fdin[1]; | |
474 | } | |
475 | ||
476 | need_out = async->out < 0; | |
477 | if (need_out) { | |
478 | if (pipe(fdout) < 0) { | |
479 | if (need_in) | |
480 | close_pair(fdin); | |
481 | else if (async->in) | |
482 | close(async->in); | |
483 | return error("cannot create pipe: %s", strerror(errno)); | |
484 | } | |
485 | async->out = fdout[0]; | |
486 | } | |
487 | ||
488 | if (need_in) | |
489 | proc_in = fdin[0]; | |
490 | else if (async->in) | |
491 | proc_in = async->in; | |
492 | else | |
493 | proc_in = -1; | |
494 | ||
495 | if (need_out) | |
496 | proc_out = fdout[1]; | |
497 | else if (async->out) | |
498 | proc_out = async->out; | |
499 | else | |
500 | proc_out = -1; | |
501 | ||
502 | #ifndef WIN32 | |
503 | /* Flush stdio before fork() to avoid cloning buffers */ | |
504 | fflush(NULL); | |
505 | ||
506 | async->pid = fork(); | |
507 | if (async->pid < 0) { | |
508 | error("fork (async) failed: %s", strerror(errno)); | |
509 | goto error; | |
510 | } | |
511 | if (!async->pid) { | |
512 | if (need_in) | |
513 | close(fdin[1]); | |
514 | if (need_out) | |
515 | close(fdout[0]); | |
516 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
517 | } | |
518 | ||
519 | if (need_in) | |
520 | close(fdin[0]); | |
521 | else if (async->in) | |
522 | close(async->in); | |
523 | ||
524 | if (need_out) | |
525 | close(fdout[1]); | |
526 | else if (async->out) | |
527 | close(async->out); | |
528 | #else | |
529 | async->proc_in = proc_in; | |
530 | async->proc_out = proc_out; | |
531 | async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL); | |
532 | if (!async->tid) { | |
533 | error("cannot create thread: %s", strerror(errno)); | |
534 | goto error; | |
535 | } | |
536 | #endif | |
537 | return 0; | |
538 | ||
539 | error: | |
540 | if (need_in) | |
541 | close_pair(fdin); | |
542 | else if (async->in) | |
543 | close(async->in); | |
544 | ||
545 | if (need_out) | |
546 | close_pair(fdout); | |
547 | else if (async->out) | |
548 | close(async->out); | |
549 | return -1; | |
550 | } | |
551 | ||
552 | int finish_async(struct async *async) | |
553 | { | |
554 | #ifndef WIN32 | |
555 | int ret = wait_or_whine(async->pid, "child process", 0); | |
556 | #else | |
557 | DWORD ret = 0; | |
558 | if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) | |
559 | ret = error("waiting for thread failed: %lu", GetLastError()); | |
560 | else if (!GetExitCodeThread(async->tid, &ret)) | |
561 | ret = error("cannot get thread exit code: %lu", GetLastError()); | |
562 | CloseHandle(async->tid); | |
563 | #endif | |
564 | return ret; | |
565 | } | |
566 | ||
567 | int run_hook(const char *index_file, const char *name, ...) | |
568 | { | |
569 | struct child_process hook; | |
570 | const char **argv = NULL, *env[2]; | |
571 | char index[PATH_MAX]; | |
572 | va_list args; | |
573 | int ret; | |
574 | size_t i = 0, alloc = 0; | |
575 | ||
576 | if (access(git_path("hooks/%s", name), X_OK) < 0) | |
577 | return 0; | |
578 | ||
579 | va_start(args, name); | |
580 | ALLOC_GROW(argv, i + 1, alloc); | |
581 | argv[i++] = git_path("hooks/%s", name); | |
582 | while (argv[i-1]) { | |
583 | ALLOC_GROW(argv, i + 1, alloc); | |
584 | argv[i++] = va_arg(args, const char *); | |
585 | } | |
586 | va_end(args); | |
587 | ||
588 | memset(&hook, 0, sizeof(hook)); | |
589 | hook.argv = argv; | |
590 | hook.no_stdin = 1; | |
591 | hook.stdout_to_stderr = 1; | |
592 | if (index_file) { | |
593 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
594 | env[0] = index; | |
595 | env[1] = NULL; | |
596 | hook.env = env; | |
597 | } | |
598 | ||
599 | ret = run_command(&hook); | |
600 | free(argv); | |
601 | return ret; | |
602 | } |