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Commit | Line | Data |
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b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
afe19ff7 | 4 | #include "sigchain.h" |
5d40a179 | 5 | #include "argv-array.h" |
c553c72e SB |
6 | #include "thread-utils.h" |
7 | #include "strbuf.h" | |
b1bf95bb | 8 | |
483bbd4e RS |
9 | void child_process_init(struct child_process *child) |
10 | { | |
11 | memset(child, 0, sizeof(*child)); | |
12 | argv_array_init(&child->args); | |
19a583dc | 13 | argv_array_init(&child->env_array); |
483bbd4e RS |
14 | } |
15 | ||
2d71608e RS |
16 | void child_process_clear(struct child_process *child) |
17 | { | |
18 | argv_array_clear(&child->args); | |
19 | argv_array_clear(&child->env_array); | |
20 | } | |
21 | ||
afe19ff7 JK |
22 | struct child_to_clean { |
23 | pid_t pid; | |
ac2fbaa6 | 24 | struct child_process *process; |
afe19ff7 JK |
25 | struct child_to_clean *next; |
26 | }; | |
27 | static struct child_to_clean *children_to_clean; | |
28 | static int installed_child_cleanup_handler; | |
29 | ||
507d7804 | 30 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 | 31 | { |
46df6906 JK |
32 | struct child_to_clean *children_to_wait_for = NULL; |
33 | ||
afe19ff7 JK |
34 | while (children_to_clean) { |
35 | struct child_to_clean *p = children_to_clean; | |
36 | children_to_clean = p->next; | |
ac2fbaa6 LS |
37 | |
38 | if (p->process && !in_signal) { | |
39 | struct child_process *process = p->process; | |
40 | if (process->clean_on_exit_handler) { | |
41 | trace_printf( | |
42 | "trace: run_command: running exit handler for pid %" | |
43 | PRIuMAX, (uintmax_t)p->pid | |
44 | ); | |
45 | process->clean_on_exit_handler(process); | |
46 | } | |
47 | } | |
48 | ||
afe19ff7 | 49 | kill(p->pid, sig); |
46df6906 | 50 | |
7b91929b | 51 | if (p->process && p->process->wait_after_clean) { |
46df6906 JK |
52 | p->next = children_to_wait_for; |
53 | children_to_wait_for = p; | |
54 | } else { | |
55 | if (!in_signal) | |
56 | free(p); | |
57 | } | |
58 | } | |
59 | ||
60 | while (children_to_wait_for) { | |
61 | struct child_to_clean *p = children_to_wait_for; | |
62 | children_to_wait_for = p->next; | |
63 | ||
64 | while (waitpid(p->pid, NULL, 0) < 0 && errno == EINTR) | |
65 | ; /* spin waiting for process exit or error */ | |
66 | ||
507d7804 TI |
67 | if (!in_signal) |
68 | free(p); | |
afe19ff7 JK |
69 | } |
70 | } | |
71 | ||
72 | static void cleanup_children_on_signal(int sig) | |
73 | { | |
507d7804 | 74 | cleanup_children(sig, 1); |
afe19ff7 JK |
75 | sigchain_pop(sig); |
76 | raise(sig); | |
77 | } | |
78 | ||
79 | static void cleanup_children_on_exit(void) | |
80 | { | |
507d7804 | 81 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
82 | } |
83 | ||
ac2fbaa6 | 84 | static void mark_child_for_cleanup(pid_t pid, struct child_process *process) |
afe19ff7 JK |
85 | { |
86 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
87 | p->pid = pid; | |
ac2fbaa6 | 88 | p->process = process; |
afe19ff7 JK |
89 | p->next = children_to_clean; |
90 | children_to_clean = p; | |
91 | ||
92 | if (!installed_child_cleanup_handler) { | |
93 | atexit(cleanup_children_on_exit); | |
94 | sigchain_push_common(cleanup_children_on_signal); | |
95 | installed_child_cleanup_handler = 1; | |
96 | } | |
97 | } | |
98 | ||
99 | static void clear_child_for_cleanup(pid_t pid) | |
100 | { | |
bdee397d | 101 | struct child_to_clean **pp; |
afe19ff7 | 102 | |
bdee397d DG |
103 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
104 | struct child_to_clean *clean_me = *pp; | |
105 | ||
106 | if (clean_me->pid == pid) { | |
107 | *pp = clean_me->next; | |
108 | free(clean_me); | |
afe19ff7 JK |
109 | return; |
110 | } | |
111 | } | |
112 | } | |
113 | ||
9dc09c76 SP |
114 | static inline void close_pair(int fd[2]) |
115 | { | |
116 | close(fd[0]); | |
117 | close(fd[1]); | |
118 | } | |
119 | ||
38124a40 BW |
120 | int is_executable(const char *name) |
121 | { | |
122 | struct stat st; | |
123 | ||
124 | if (stat(name, &st) || /* stat, not lstat */ | |
125 | !S_ISREG(st.st_mode)) | |
126 | return 0; | |
127 | ||
128 | #if defined(GIT_WINDOWS_NATIVE) | |
129 | /* | |
130 | * On Windows there is no executable bit. The file extension | |
131 | * indicates whether it can be run as an executable, and Git | |
132 | * has special-handling to detect scripts and launch them | |
133 | * through the indicated script interpreter. We test for the | |
134 | * file extension first because virus scanners may make | |
135 | * it quite expensive to open many files. | |
136 | */ | |
137 | if (ends_with(name, ".exe")) | |
138 | return S_IXUSR; | |
139 | ||
140 | { | |
141 | /* | |
142 | * Now that we know it does not have an executable extension, | |
143 | * peek into the file instead. | |
144 | */ | |
145 | char buf[3] = { 0 }; | |
146 | int n; | |
147 | int fd = open(name, O_RDONLY); | |
148 | st.st_mode &= ~S_IXUSR; | |
149 | if (fd >= 0) { | |
150 | n = read(fd, buf, 2); | |
151 | if (n == 2) | |
152 | /* look for a she-bang */ | |
153 | if (!strcmp(buf, "#!")) | |
154 | st.st_mode |= S_IXUSR; | |
155 | close(fd); | |
156 | } | |
157 | } | |
158 | #endif | |
159 | return st.st_mode & S_IXUSR; | |
160 | } | |
161 | ||
94028310 BW |
162 | /* |
163 | * Search $PATH for a command. This emulates the path search that | |
164 | * execvp would perform, without actually executing the command so it | |
165 | * can be used before fork() to prepare to run a command using | |
166 | * execve() or after execvp() to diagnose why it failed. | |
167 | * | |
168 | * The caller should ensure that file contains no directory | |
169 | * separators. | |
170 | * | |
171 | * Returns the path to the command, as found in $PATH or NULL if the | |
172 | * command could not be found. The caller inherits ownership of the memory | |
173 | * used to store the resultant path. | |
174 | * | |
175 | * This should not be used on Windows, where the $PATH search rules | |
176 | * are more complicated (e.g., a search for "foo" should find | |
177 | * "foo.exe"). | |
178 | */ | |
38f865c2 JK |
179 | static char *locate_in_PATH(const char *file) |
180 | { | |
181 | const char *p = getenv("PATH"); | |
182 | struct strbuf buf = STRBUF_INIT; | |
183 | ||
184 | if (!p || !*p) | |
185 | return NULL; | |
186 | ||
187 | while (1) { | |
188 | const char *end = strchrnul(p, ':'); | |
189 | ||
190 | strbuf_reset(&buf); | |
191 | ||
192 | /* POSIX specifies an empty entry as the current directory. */ | |
193 | if (end != p) { | |
194 | strbuf_add(&buf, p, end - p); | |
195 | strbuf_addch(&buf, '/'); | |
196 | } | |
197 | strbuf_addstr(&buf, file); | |
198 | ||
94028310 | 199 | if (is_executable(buf.buf)) |
38f865c2 JK |
200 | return strbuf_detach(&buf, NULL); |
201 | ||
202 | if (!*end) | |
203 | break; | |
204 | p = end + 1; | |
205 | } | |
206 | ||
207 | strbuf_release(&buf); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | static int exists_in_PATH(const char *file) | |
212 | { | |
213 | char *r = locate_in_PATH(file); | |
214 | free(r); | |
215 | return r != NULL; | |
216 | } | |
217 | ||
218 | int sane_execvp(const char *file, char * const argv[]) | |
219 | { | |
220 | if (!execvp(file, argv)) | |
221 | return 0; /* cannot happen ;-) */ | |
222 | ||
223 | /* | |
224 | * When a command can't be found because one of the directories | |
225 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
226 | * careful usability testing (read: analysis of occasional bug | |
227 | * reports) reveals that "No such file or directory" is more | |
228 | * intuitive. | |
229 | * | |
230 | * We avoid commands with "/", because execvp will not do $PATH | |
231 | * lookups in that case. | |
232 | * | |
233 | * The reassignment of EACCES to errno looks like a no-op below, | |
234 | * but we need to protect against exists_in_PATH overwriting errno. | |
235 | */ | |
236 | if (errno == EACCES && !strchr(file, '/')) | |
237 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
238 | else if (errno == ENOTDIR && !strchr(file, '/')) |
239 | errno = ENOENT; | |
38f865c2 JK |
240 | return -1; |
241 | } | |
242 | ||
20574f55 | 243 | static const char **prepare_shell_cmd(struct argv_array *out, const char **argv) |
8dba1e63 | 244 | { |
20574f55 | 245 | if (!argv[0]) |
8dba1e63 JK |
246 | die("BUG: shell command is empty"); |
247 | ||
f445644f | 248 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 249 | #ifndef GIT_WINDOWS_NATIVE |
20574f55 | 250 | argv_array_push(out, SHELL_PATH); |
77629754 | 251 | #else |
20574f55 | 252 | argv_array_push(out, "sh"); |
77629754 | 253 | #endif |
20574f55 | 254 | argv_array_push(out, "-c"); |
8dba1e63 | 255 | |
20574f55 JK |
256 | /* |
257 | * If we have no extra arguments, we do not even need to | |
258 | * bother with the "$@" magic. | |
259 | */ | |
260 | if (!argv[1]) | |
261 | argv_array_push(out, argv[0]); | |
262 | else | |
263 | argv_array_pushf(out, "%s \"$@\"", argv[0]); | |
264 | } | |
8dba1e63 | 265 | |
20574f55 JK |
266 | argv_array_pushv(out, argv); |
267 | return out->argv; | |
8dba1e63 JK |
268 | } |
269 | ||
380395d0 | 270 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
271 | static int child_notifier = -1; |
272 | ||
79319b19 BW |
273 | enum child_errcode { |
274 | CHILD_ERR_CHDIR, | |
53fa6753 BW |
275 | CHILD_ERR_DUP2, |
276 | CHILD_ERR_CLOSE, | |
45afb1ca | 277 | CHILD_ERR_SIGPROCMASK, |
79319b19 BW |
278 | CHILD_ERR_ENOENT, |
279 | CHILD_ERR_SILENT, | |
280 | CHILD_ERR_ERRNO | |
281 | }; | |
282 | ||
283 | struct child_err { | |
284 | enum child_errcode err; | |
285 | int syserr; /* errno */ | |
286 | }; | |
287 | ||
288 | static void child_die(enum child_errcode err) | |
2b541bf8 | 289 | { |
79319b19 BW |
290 | struct child_err buf; |
291 | ||
292 | buf.err = err; | |
293 | buf.syserr = errno; | |
294 | ||
295 | /* write(2) on buf smaller than PIPE_BUF (min 512) is atomic: */ | |
296 | xwrite(child_notifier, &buf, sizeof(buf)); | |
297 | _exit(1); | |
298 | } | |
299 | ||
53fa6753 BW |
300 | static void child_dup2(int fd, int to) |
301 | { | |
302 | if (dup2(fd, to) < 0) | |
303 | child_die(CHILD_ERR_DUP2); | |
304 | } | |
305 | ||
306 | static void child_close(int fd) | |
307 | { | |
308 | if (close(fd)) | |
309 | child_die(CHILD_ERR_CLOSE); | |
310 | } | |
311 | ||
312 | static void child_close_pair(int fd[2]) | |
313 | { | |
314 | child_close(fd[0]); | |
315 | child_close(fd[1]); | |
316 | } | |
317 | ||
79319b19 BW |
318 | /* |
319 | * parent will make it look like the child spewed a fatal error and died | |
320 | * this is needed to prevent changes to t0061. | |
321 | */ | |
322 | static void fake_fatal(const char *err, va_list params) | |
323 | { | |
324 | vreportf("fatal: ", err, params); | |
325 | } | |
326 | ||
327 | static void child_error_fn(const char *err, va_list params) | |
328 | { | |
329 | const char msg[] = "error() should not be called in child\n"; | |
330 | xwrite(2, msg, sizeof(msg) - 1); | |
331 | } | |
332 | ||
333 | static void child_warn_fn(const char *err, va_list params) | |
334 | { | |
335 | const char msg[] = "warn() should not be called in child\n"; | |
336 | xwrite(2, msg, sizeof(msg) - 1); | |
337 | } | |
338 | ||
339 | static void NORETURN child_die_fn(const char *err, va_list params) | |
340 | { | |
341 | const char msg[] = "die() should not be called in child\n"; | |
342 | xwrite(2, msg, sizeof(msg) - 1); | |
343 | _exit(2); | |
344 | } | |
345 | ||
346 | /* this runs in the parent process */ | |
347 | static void child_err_spew(struct child_process *cmd, struct child_err *cerr) | |
348 | { | |
349 | static void (*old_errfn)(const char *err, va_list params); | |
350 | ||
351 | old_errfn = get_error_routine(); | |
352 | set_error_routine(fake_fatal); | |
353 | errno = cerr->syserr; | |
354 | ||
355 | switch (cerr->err) { | |
356 | case CHILD_ERR_CHDIR: | |
357 | error_errno("exec '%s': cd to '%s' failed", | |
358 | cmd->argv[0], cmd->dir); | |
359 | break; | |
53fa6753 BW |
360 | case CHILD_ERR_DUP2: |
361 | error_errno("dup2() in child failed"); | |
362 | break; | |
363 | case CHILD_ERR_CLOSE: | |
364 | error_errno("close() in child failed"); | |
365 | break; | |
45afb1ca EW |
366 | case CHILD_ERR_SIGPROCMASK: |
367 | error_errno("sigprocmask failed restoring signals"); | |
368 | break; | |
79319b19 BW |
369 | case CHILD_ERR_ENOENT: |
370 | error_errno("cannot run %s", cmd->argv[0]); | |
371 | break; | |
372 | case CHILD_ERR_SILENT: | |
373 | break; | |
374 | case CHILD_ERR_ERRNO: | |
375 | error_errno("cannot exec '%s'", cmd->argv[0]); | |
376 | break; | |
377 | } | |
378 | set_error_routine(old_errfn); | |
2b541bf8 | 379 | } |
3967e25b BW |
380 | |
381 | static void prepare_cmd(struct argv_array *out, const struct child_process *cmd) | |
382 | { | |
383 | if (!cmd->argv[0]) | |
384 | die("BUG: command is empty"); | |
385 | ||
e3a43446 BW |
386 | /* |
387 | * Add SHELL_PATH so in the event exec fails with ENOEXEC we can | |
388 | * attempt to interpret the command with 'sh'. | |
389 | */ | |
390 | argv_array_push(out, SHELL_PATH); | |
391 | ||
3967e25b BW |
392 | if (cmd->git_cmd) { |
393 | argv_array_push(out, "git"); | |
394 | argv_array_pushv(out, cmd->argv); | |
395 | } else if (cmd->use_shell) { | |
396 | prepare_shell_cmd(out, cmd->argv); | |
397 | } else { | |
398 | argv_array_pushv(out, cmd->argv); | |
399 | } | |
e3a43446 BW |
400 | |
401 | /* | |
402 | * If there are no '/' characters in the command then perform a path | |
403 | * lookup and use the resolved path as the command to exec. If there | |
404 | * are no '/' characters or if the command wasn't found in the path, | |
405 | * have exec attempt to invoke the command directly. | |
406 | */ | |
407 | if (!strchr(out->argv[1], '/')) { | |
408 | char *program = locate_in_PATH(out->argv[1]); | |
409 | if (program) { | |
410 | free((char *)out->argv[1]); | |
411 | out->argv[1] = program; | |
412 | } | |
413 | } | |
3967e25b | 414 | } |
ae25394b BW |
415 | |
416 | static char **prep_childenv(const char *const *deltaenv) | |
417 | { | |
418 | extern char **environ; | |
419 | char **childenv; | |
420 | struct string_list env = STRING_LIST_INIT_DUP; | |
421 | struct strbuf key = STRBUF_INIT; | |
422 | const char *const *p; | |
423 | int i; | |
424 | ||
425 | /* Construct a sorted string list consisting of the current environ */ | |
426 | for (p = (const char *const *) environ; p && *p; p++) { | |
427 | const char *equals = strchr(*p, '='); | |
428 | ||
429 | if (equals) { | |
430 | strbuf_reset(&key); | |
431 | strbuf_add(&key, *p, equals - *p); | |
432 | string_list_append(&env, key.buf)->util = (void *) *p; | |
433 | } else { | |
434 | string_list_append(&env, *p)->util = (void *) *p; | |
435 | } | |
436 | } | |
437 | string_list_sort(&env); | |
438 | ||
439 | /* Merge in 'deltaenv' with the current environ */ | |
440 | for (p = deltaenv; p && *p; p++) { | |
441 | const char *equals = strchr(*p, '='); | |
442 | ||
443 | if (equals) { | |
444 | /* ('key=value'), insert or replace entry */ | |
445 | strbuf_reset(&key); | |
446 | strbuf_add(&key, *p, equals - *p); | |
447 | string_list_insert(&env, key.buf)->util = (void *) *p; | |
448 | } else { | |
449 | /* otherwise ('key') remove existing entry */ | |
450 | string_list_remove(&env, *p, 0); | |
451 | } | |
452 | } | |
453 | ||
454 | /* Create an array of 'char *' to be used as the childenv */ | |
455 | childenv = xmalloc((env.nr + 1) * sizeof(char *)); | |
456 | for (i = 0; i < env.nr; i++) | |
457 | childenv[i] = env.items[i].util; | |
458 | childenv[env.nr] = NULL; | |
459 | ||
460 | string_list_clear(&env, 0); | |
461 | strbuf_release(&key); | |
462 | return childenv; | |
463 | } | |
45afb1ca EW |
464 | |
465 | struct atfork_state { | |
466 | #ifndef NO_PTHREADS | |
467 | int cs; | |
468 | #endif | |
469 | sigset_t old; | |
470 | }; | |
471 | ||
472 | #ifndef NO_PTHREADS | |
473 | static void bug_die(int err, const char *msg) | |
474 | { | |
475 | if (err) { | |
476 | errno = err; | |
477 | die_errno("BUG: %s", msg); | |
478 | } | |
479 | } | |
480 | #endif | |
481 | ||
482 | static void atfork_prepare(struct atfork_state *as) | |
483 | { | |
484 | sigset_t all; | |
485 | ||
486 | if (sigfillset(&all)) | |
487 | die_errno("sigfillset"); | |
488 | #ifdef NO_PTHREADS | |
489 | if (sigprocmask(SIG_SETMASK, &all, &as->old)) | |
490 | die_errno("sigprocmask"); | |
491 | #else | |
492 | bug_die(pthread_sigmask(SIG_SETMASK, &all, &as->old), | |
493 | "blocking all signals"); | |
494 | bug_die(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs), | |
495 | "disabling cancellation"); | |
496 | #endif | |
497 | } | |
498 | ||
499 | static void atfork_parent(struct atfork_state *as) | |
500 | { | |
501 | #ifdef NO_PTHREADS | |
502 | if (sigprocmask(SIG_SETMASK, &as->old, NULL)) | |
503 | die_errno("sigprocmask"); | |
504 | #else | |
505 | bug_die(pthread_setcancelstate(as->cs, NULL), | |
506 | "re-enabling cancellation"); | |
507 | bug_die(pthread_sigmask(SIG_SETMASK, &as->old, NULL), | |
508 | "restoring signal mask"); | |
200a76b7 | 509 | #endif |
45afb1ca EW |
510 | } |
511 | #endif /* GIT_WINDOWS_NATIVE */ | |
a5487ddf JS |
512 | |
513 | static inline void set_cloexec(int fd) | |
514 | { | |
515 | int flags = fcntl(fd, F_GETFD); | |
516 | if (flags >= 0) | |
517 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
518 | } | |
a5487ddf | 519 | |
507d7804 | 520 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
521 | { |
522 | int status, code = -1; | |
523 | pid_t waiting; | |
524 | int failed_errno = 0; | |
525 | ||
526 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
527 | ; /* nothing */ | |
507d7804 TI |
528 | if (in_signal) |
529 | return 0; | |
ab0b41da JS |
530 | |
531 | if (waiting < 0) { | |
532 | failed_errno = errno; | |
fbcb0e06 | 533 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
534 | } else if (waiting != pid) { |
535 | error("waitpid is confused (%s)", argv0); | |
536 | } else if (WIFSIGNALED(status)) { | |
537 | code = WTERMSIG(status); | |
ac78663b | 538 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 539 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
540 | /* |
541 | * This return value is chosen so that code & 0xff | |
542 | * mimics the exit code that a POSIX shell would report for | |
543 | * a program that died from this signal. | |
544 | */ | |
709ca730 | 545 | code += 128; |
ab0b41da JS |
546 | } else if (WIFEXITED(status)) { |
547 | code = WEXITSTATUS(status); | |
ab0b41da JS |
548 | } else { |
549 | error("waitpid is confused (%s)", argv0); | |
550 | } | |
afe19ff7 JK |
551 | |
552 | clear_child_for_cleanup(pid); | |
553 | ||
ab0b41da JS |
554 | errno = failed_errno; |
555 | return code; | |
556 | } | |
557 | ||
ebcb5d16 | 558 | int start_command(struct child_process *cmd) |
b1bf95bb | 559 | { |
f3b33f1d JS |
560 | int need_in, need_out, need_err; |
561 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 562 | int failed_errno; |
939296c4 | 563 | char *str; |
4919bf03 | 564 | |
c460c0ec JK |
565 | if (!cmd->argv) |
566 | cmd->argv = cmd->args.argv; | |
19a583dc RS |
567 | if (!cmd->env) |
568 | cmd->env = cmd->env_array.argv; | |
c460c0ec | 569 | |
c20181e3 JS |
570 | /* |
571 | * In case of errors we must keep the promise to close FDs | |
572 | * that have been passed in via ->in and ->out. | |
573 | */ | |
574 | ||
e4507ae8 | 575 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 576 | if (need_in) { |
c20181e3 | 577 | if (pipe(fdin) < 0) { |
0ac77ec3 | 578 | failed_errno = errno; |
c20181e3 JS |
579 | if (cmd->out > 0) |
580 | close(cmd->out); | |
939296c4 | 581 | str = "standard input"; |
0ac77ec3 | 582 | goto fail_pipe; |
c20181e3 | 583 | } |
4919bf03 | 584 | cmd->in = fdin[1]; |
4919bf03 SP |
585 | } |
586 | ||
e4507ae8 SP |
587 | need_out = !cmd->no_stdout |
588 | && !cmd->stdout_to_stderr | |
589 | && cmd->out < 0; | |
f4bba25b SP |
590 | if (need_out) { |
591 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 592 | failed_errno = errno; |
f4bba25b SP |
593 | if (need_in) |
594 | close_pair(fdin); | |
c20181e3 JS |
595 | else if (cmd->in) |
596 | close(cmd->in); | |
939296c4 | 597 | str = "standard output"; |
0ac77ec3 | 598 | goto fail_pipe; |
f4bba25b SP |
599 | } |
600 | cmd->out = fdout[0]; | |
f4bba25b SP |
601 | } |
602 | ||
b73a4397 | 603 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
604 | if (need_err) { |
605 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 606 | failed_errno = errno; |
f3b33f1d JS |
607 | if (need_in) |
608 | close_pair(fdin); | |
c20181e3 JS |
609 | else if (cmd->in) |
610 | close(cmd->in); | |
f3b33f1d JS |
611 | if (need_out) |
612 | close_pair(fdout); | |
c20181e3 JS |
613 | else if (cmd->out) |
614 | close(cmd->out); | |
939296c4 | 615 | str = "standard error"; |
0ac77ec3 | 616 | fail_pipe: |
939296c4 SB |
617 | error("cannot create %s pipe for %s: %s", |
618 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 619 | child_process_clear(cmd); |
0ac77ec3 JS |
620 | errno = failed_errno; |
621 | return -1; | |
f3b33f1d JS |
622 | } |
623 | cmd->err = fderr[0]; | |
624 | } | |
625 | ||
8852f5d7 | 626 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
13af8cbd | 627 | fflush(NULL); |
8852f5d7 | 628 | |
380395d0 | 629 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
630 | { |
631 | int notify_pipe[2]; | |
db015a28 | 632 | int null_fd = -1; |
ae25394b | 633 | char **childenv; |
3967e25b | 634 | struct argv_array argv = ARGV_ARRAY_INIT; |
79319b19 | 635 | struct child_err cerr; |
45afb1ca | 636 | struct atfork_state as; |
3967e25b | 637 | |
2b541bf8 JS |
638 | if (pipe(notify_pipe)) |
639 | notify_pipe[0] = notify_pipe[1] = -1; | |
640 | ||
db015a28 BW |
641 | if (cmd->no_stdin || cmd->no_stdout || cmd->no_stderr) { |
642 | null_fd = open("/dev/null", O_RDWR | O_CLOEXEC); | |
643 | if (null_fd < 0) | |
644 | die_errno(_("open /dev/null failed")); | |
645 | set_cloexec(null_fd); | |
646 | } | |
647 | ||
3967e25b | 648 | prepare_cmd(&argv, cmd); |
ae25394b | 649 | childenv = prep_childenv(cmd->env); |
45afb1ca | 650 | atfork_prepare(&as); |
3967e25b | 651 | |
e503cd6e BW |
652 | /* |
653 | * NOTE: In order to prevent deadlocking when using threads special | |
654 | * care should be taken with the function calls made in between the | |
655 | * fork() and exec() calls. No calls should be made to functions which | |
656 | * require acquiring a lock (e.g. malloc) as the lock could have been | |
657 | * held by another thread at the time of forking, causing the lock to | |
658 | * never be released in the child process. This means only | |
659 | * Async-Signal-Safe functions are permitted in the child. | |
660 | */ | |
ebcb5d16 | 661 | cmd->pid = fork(); |
25043d8a | 662 | failed_errno = errno; |
ebcb5d16 | 663 | if (!cmd->pid) { |
45afb1ca | 664 | int sig; |
a5487ddf | 665 | /* |
79319b19 BW |
666 | * Ensure the default die/error/warn routines do not get |
667 | * called, they can take stdio locks and malloc. | |
a5487ddf | 668 | */ |
79319b19 BW |
669 | set_die_routine(child_die_fn); |
670 | set_error_routine(child_error_fn); | |
671 | set_warn_routine(child_warn_fn); | |
a5487ddf | 672 | |
2b541bf8 JS |
673 | close(notify_pipe[0]); |
674 | set_cloexec(notify_pipe[1]); | |
675 | child_notifier = notify_pipe[1]; | |
2b541bf8 | 676 | |
e4507ae8 | 677 | if (cmd->no_stdin) |
53fa6753 | 678 | child_dup2(null_fd, 0); |
e4507ae8 | 679 | else if (need_in) { |
53fa6753 BW |
680 | child_dup2(fdin[0], 0); |
681 | child_close_pair(fdin); | |
4919bf03 | 682 | } else if (cmd->in) { |
53fa6753 BW |
683 | child_dup2(cmd->in, 0); |
684 | child_close(cmd->in); | |
95d3c4f5 | 685 | } |
4919bf03 | 686 | |
ce2cf27a | 687 | if (cmd->no_stderr) |
53fa6753 | 688 | child_dup2(null_fd, 2); |
ce2cf27a | 689 | else if (need_err) { |
53fa6753 BW |
690 | child_dup2(fderr[1], 2); |
691 | child_close_pair(fderr); | |
4f41b611 | 692 | } else if (cmd->err > 1) { |
53fa6753 BW |
693 | child_dup2(cmd->err, 2); |
694 | child_close(cmd->err); | |
ce2cf27a CC |
695 | } |
696 | ||
e4507ae8 | 697 | if (cmd->no_stdout) |
53fa6753 | 698 | child_dup2(null_fd, 1); |
e4507ae8 | 699 | else if (cmd->stdout_to_stderr) |
53fa6753 | 700 | child_dup2(2, 1); |
f4bba25b | 701 | else if (need_out) { |
53fa6753 BW |
702 | child_dup2(fdout[1], 1); |
703 | child_close_pair(fdout); | |
f4bba25b | 704 | } else if (cmd->out > 1) { |
53fa6753 BW |
705 | child_dup2(cmd->out, 1); |
706 | child_close(cmd->out); | |
f4bba25b SP |
707 | } |
708 | ||
1568fea0 | 709 | if (cmd->dir && chdir(cmd->dir)) |
79319b19 | 710 | child_die(CHILD_ERR_CHDIR); |
3967e25b | 711 | |
45afb1ca EW |
712 | /* |
713 | * restore default signal handlers here, in case | |
714 | * we catch a signal right before execve below | |
715 | */ | |
716 | for (sig = 1; sig < NSIG; sig++) { | |
717 | /* ignored signals get reset to SIG_DFL on execve */ | |
718 | if (signal(sig, SIG_DFL) == SIG_IGN) | |
719 | signal(sig, SIG_IGN); | |
720 | } | |
721 | ||
722 | if (sigprocmask(SIG_SETMASK, &as.old, NULL) != 0) | |
723 | child_die(CHILD_ERR_SIGPROCMASK); | |
724 | ||
e3a43446 BW |
725 | /* |
726 | * Attempt to exec using the command and arguments starting at | |
727 | * argv.argv[1]. argv.argv[0] contains SHELL_PATH which will | |
728 | * be used in the event exec failed with ENOEXEC at which point | |
729 | * we will try to interpret the command using 'sh'. | |
730 | */ | |
ae25394b BW |
731 | execve(argv.argv[1], (char *const *) argv.argv + 1, |
732 | (char *const *) childenv); | |
e3a43446 | 733 | if (errno == ENOEXEC) |
ae25394b BW |
734 | execve(argv.argv[0], (char *const *) argv.argv, |
735 | (char *const *) childenv); | |
3967e25b | 736 | |
fc1b56f0 | 737 | if (errno == ENOENT) { |
79319b19 BW |
738 | if (cmd->silent_exec_failure) |
739 | child_die(CHILD_ERR_SILENT); | |
740 | child_die(CHILD_ERR_ENOENT); | |
fc1b56f0 | 741 | } else { |
79319b19 | 742 | child_die(CHILD_ERR_ERRNO); |
fc1b56f0 | 743 | } |
b1bf95bb | 744 | } |
45afb1ca | 745 | atfork_parent(&as); |
0ac77ec3 | 746 | if (cmd->pid < 0) |
fbcb0e06 | 747 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 | 748 | else if (cmd->clean_on_exit) |
ac2fbaa6 | 749 | mark_child_for_cleanup(cmd->pid, cmd); |
2b541bf8 JS |
750 | |
751 | /* | |
3967e25b | 752 | * Wait for child's exec. If the exec succeeds (or if fork() |
2b541bf8 | 753 | * failed), EOF is seen immediately by the parent. Otherwise, the |
79319b19 | 754 | * child process sends a child_err struct. |
2b541bf8 JS |
755 | * Note that use of this infrastructure is completely advisory, |
756 | * therefore, we keep error checks minimal. | |
757 | */ | |
758 | close(notify_pipe[1]); | |
79319b19 | 759 | if (xread(notify_pipe[0], &cerr, sizeof(cerr)) == sizeof(cerr)) { |
2b541bf8 | 760 | /* |
3967e25b | 761 | * At this point we know that fork() succeeded, but exec() |
2b541bf8 JS |
762 | * failed. Errors have been reported to our stderr. |
763 | */ | |
507d7804 | 764 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
79319b19 | 765 | child_err_spew(cmd, &cerr); |
2b541bf8 JS |
766 | failed_errno = errno; |
767 | cmd->pid = -1; | |
768 | } | |
769 | close(notify_pipe[0]); | |
3967e25b | 770 | |
db015a28 BW |
771 | if (null_fd >= 0) |
772 | close(null_fd); | |
3967e25b | 773 | argv_array_clear(&argv); |
ae25394b | 774 | free(childenv); |
2b541bf8 | 775 | } |
ba26f296 | 776 | #else |
0d30ad71 | 777 | { |
75301f90 | 778 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 779 | const char **sargv = cmd->argv; |
20574f55 | 780 | struct argv_array nargv = ARGV_ARRAY_INIT; |
ba26f296 | 781 | |
75301f90 JS |
782 | if (cmd->no_stdin) |
783 | fhin = open("/dev/null", O_RDWR); | |
784 | else if (need_in) | |
785 | fhin = dup(fdin[0]); | |
786 | else if (cmd->in) | |
787 | fhin = dup(cmd->in); | |
788 | ||
789 | if (cmd->no_stderr) | |
790 | fherr = open("/dev/null", O_RDWR); | |
791 | else if (need_err) | |
792 | fherr = dup(fderr[1]); | |
76d44c8c JH |
793 | else if (cmd->err > 2) |
794 | fherr = dup(cmd->err); | |
75301f90 JS |
795 | |
796 | if (cmd->no_stdout) | |
797 | fhout = open("/dev/null", O_RDWR); | |
798 | else if (cmd->stdout_to_stderr) | |
799 | fhout = dup(fherr); | |
800 | else if (need_out) | |
801 | fhout = dup(fdout[1]); | |
802 | else if (cmd->out > 1) | |
803 | fhout = dup(cmd->out); | |
ba26f296 | 804 | |
5a50085c | 805 | if (cmd->git_cmd) |
20574f55 | 806 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 807 | else if (cmd->use_shell) |
20574f55 | 808 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 809 | |
77734da2 KB |
810 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
811 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 812 | failed_errno = errno; |
c024beb5 | 813 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 814 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 | 815 | if (cmd->clean_on_exit && cmd->pid >= 0) |
ac2fbaa6 | 816 | mark_child_for_cleanup(cmd->pid, cmd); |
ba26f296 | 817 | |
20574f55 | 818 | argv_array_clear(&nargv); |
108ac313 | 819 | cmd->argv = sargv; |
75301f90 JS |
820 | if (fhin != 0) |
821 | close(fhin); | |
822 | if (fhout != 1) | |
823 | close(fhout); | |
824 | if (fherr != 2) | |
825 | close(fherr); | |
0d30ad71 | 826 | } |
ba26f296 JS |
827 | #endif |
828 | ||
829 | if (cmd->pid < 0) { | |
830 | if (need_in) | |
831 | close_pair(fdin); | |
832 | else if (cmd->in) | |
833 | close(cmd->in); | |
834 | if (need_out) | |
835 | close_pair(fdout); | |
836 | else if (cmd->out) | |
837 | close(cmd->out); | |
838 | if (need_err) | |
839 | close_pair(fderr); | |
fc012c28 D |
840 | else if (cmd->err) |
841 | close(cmd->err); | |
2d71608e | 842 | child_process_clear(cmd); |
0ac77ec3 JS |
843 | errno = failed_errno; |
844 | return -1; | |
ba26f296 | 845 | } |
4919bf03 SP |
846 | |
847 | if (need_in) | |
848 | close(fdin[0]); | |
849 | else if (cmd->in) | |
850 | close(cmd->in); | |
851 | ||
f4bba25b SP |
852 | if (need_out) |
853 | close(fdout[1]); | |
c20181e3 | 854 | else if (cmd->out) |
f4bba25b SP |
855 | close(cmd->out); |
856 | ||
f3b33f1d JS |
857 | if (need_err) |
858 | close(fderr[1]); | |
4f41b611 SP |
859 | else if (cmd->err) |
860 | close(cmd->err); | |
f3b33f1d | 861 | |
ebcb5d16 SP |
862 | return 0; |
863 | } | |
864 | ||
2d22c208 JS |
865 | int finish_command(struct child_process *cmd) |
866 | { | |
507d7804 | 867 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2d71608e | 868 | child_process_clear(cmd); |
c460c0ec | 869 | return ret; |
2d22c208 JS |
870 | } |
871 | ||
507d7804 TI |
872 | int finish_command_in_signal(struct child_process *cmd) |
873 | { | |
874 | return wait_or_whine(cmd->pid, cmd->argv[0], 1); | |
875 | } | |
876 | ||
877 | ||
ebcb5d16 SP |
878 | int run_command(struct child_process *cmd) |
879 | { | |
c29b3962 JK |
880 | int code; |
881 | ||
882 | if (cmd->out < 0 || cmd->err < 0) | |
883 | die("BUG: run_command with a pipe can cause deadlock"); | |
884 | ||
885 | code = start_command(cmd); | |
ebcb5d16 SP |
886 | if (code) |
887 | return code; | |
888 | return finish_command(cmd); | |
889 | } | |
890 | ||
f1000898 SP |
891 | int run_command_v_opt(const char **argv, int opt) |
892 | { | |
41e9bad7 | 893 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
894 | } |
895 | ||
ee493148 AR |
896 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
897 | { | |
1f87293d RS |
898 | struct child_process cmd = CHILD_PROCESS_INIT; |
899 | cmd.argv = argv; | |
900 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
901 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
902 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
903 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
904 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
905 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
ee493148 AR |
906 | cmd.dir = dir; |
907 | cmd.env = env; | |
908 | return run_command(&cmd); | |
909 | } | |
2d22c208 | 910 | |
f6b60983 | 911 | #ifndef NO_PTHREADS |
0ea1c89b JS |
912 | static pthread_t main_thread; |
913 | static int main_thread_set; | |
914 | static pthread_key_t async_key; | |
1ece66bc | 915 | static pthread_key_t async_die_counter; |
0ea1c89b | 916 | |
200a76b7 | 917 | static void *run_thread(void *data) |
618ebe9f JS |
918 | { |
919 | struct async *async = data; | |
f6b60983 | 920 | intptr_t ret; |
0ea1c89b | 921 | |
c792d7b6 JK |
922 | if (async->isolate_sigpipe) { |
923 | sigset_t mask; | |
924 | sigemptyset(&mask); | |
925 | sigaddset(&mask, SIGPIPE); | |
926 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
927 | ret = error("unable to block SIGPIPE in async thread"); | |
928 | return (void *)ret; | |
929 | } | |
930 | } | |
931 | ||
0ea1c89b | 932 | pthread_setspecific(async_key, async); |
f6b60983 | 933 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 934 | return (void *)ret; |
618ebe9f | 935 | } |
0ea1c89b JS |
936 | |
937 | static NORETURN void die_async(const char *err, va_list params) | |
938 | { | |
939 | vreportf("fatal: ", err, params); | |
940 | ||
661a8cf4 | 941 | if (in_async()) { |
0ea1c89b JS |
942 | struct async *async = pthread_getspecific(async_key); |
943 | if (async->proc_in >= 0) | |
944 | close(async->proc_in); | |
945 | if (async->proc_out >= 0) | |
946 | close(async->proc_out); | |
947 | pthread_exit((void *)128); | |
948 | } | |
949 | ||
950 | exit(128); | |
618ebe9f | 951 | } |
1ece66bc JK |
952 | |
953 | static int async_die_is_recursing(void) | |
954 | { | |
955 | void *ret = pthread_getspecific(async_die_counter); | |
956 | pthread_setspecific(async_die_counter, (void *)1); | |
957 | return ret != NULL; | |
958 | } | |
959 | ||
661a8cf4 JK |
960 | int in_async(void) |
961 | { | |
962 | if (!main_thread_set) | |
963 | return 0; /* no asyncs started yet */ | |
964 | return !pthread_equal(main_thread, pthread_self()); | |
965 | } | |
966 | ||
b992fe10 | 967 | static void NORETURN async_exit(int code) |
9658846c JK |
968 | { |
969 | pthread_exit((void *)(intptr_t)code); | |
970 | } | |
971 | ||
0f4b6db3 EB |
972 | #else |
973 | ||
974 | static struct { | |
975 | void (**handlers)(void); | |
976 | size_t nr; | |
977 | size_t alloc; | |
978 | } git_atexit_hdlrs; | |
979 | ||
980 | static int git_atexit_installed; | |
981 | ||
6066a7ea | 982 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
983 | { |
984 | size_t i; | |
985 | ||
986 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
987 | git_atexit_hdlrs.handlers[i-1](); | |
988 | } | |
989 | ||
6066a7ea | 990 | static void git_atexit_clear(void) |
0f4b6db3 EB |
991 | { |
992 | free(git_atexit_hdlrs.handlers); | |
993 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
994 | git_atexit_installed = 0; | |
995 | } | |
996 | ||
997 | #undef atexit | |
998 | int git_atexit(void (*handler)(void)) | |
999 | { | |
1000 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
1001 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
1002 | if (!git_atexit_installed) { | |
1003 | if (atexit(&git_atexit_dispatch)) | |
1004 | return -1; | |
1005 | git_atexit_installed = 1; | |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | #define atexit git_atexit | |
1010 | ||
661a8cf4 JK |
1011 | static int process_is_async; |
1012 | int in_async(void) | |
1013 | { | |
1014 | return process_is_async; | |
1015 | } | |
1016 | ||
b992fe10 | 1017 | static void NORETURN async_exit(int code) |
9658846c JK |
1018 | { |
1019 | exit(code); | |
1020 | } | |
1021 | ||
618ebe9f JS |
1022 | #endif |
1023 | ||
b992fe10 LS |
1024 | void check_pipe(int err) |
1025 | { | |
1026 | if (err == EPIPE) { | |
1027 | if (in_async()) | |
1028 | async_exit(141); | |
1029 | ||
1030 | signal(SIGPIPE, SIG_DFL); | |
1031 | raise(SIGPIPE); | |
1032 | /* Should never happen, but just in case... */ | |
1033 | exit(141); | |
1034 | } | |
1035 | } | |
1036 | ||
2d22c208 JS |
1037 | int start_async(struct async *async) |
1038 | { | |
ae6a5609 EFL |
1039 | int need_in, need_out; |
1040 | int fdin[2], fdout[2]; | |
1041 | int proc_in, proc_out; | |
2d22c208 | 1042 | |
ae6a5609 EFL |
1043 | need_in = async->in < 0; |
1044 | if (need_in) { | |
1045 | if (pipe(fdin) < 0) { | |
1046 | if (async->out > 0) | |
1047 | close(async->out); | |
fbcb0e06 | 1048 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1049 | } |
1050 | async->in = fdin[1]; | |
1051 | } | |
1052 | ||
1053 | need_out = async->out < 0; | |
1054 | if (need_out) { | |
1055 | if (pipe(fdout) < 0) { | |
1056 | if (need_in) | |
1057 | close_pair(fdin); | |
1058 | else if (async->in) | |
1059 | close(async->in); | |
fbcb0e06 | 1060 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1061 | } |
1062 | async->out = fdout[0]; | |
1063 | } | |
1064 | ||
1065 | if (need_in) | |
1066 | proc_in = fdin[0]; | |
1067 | else if (async->in) | |
1068 | proc_in = async->in; | |
1069 | else | |
1070 | proc_in = -1; | |
1071 | ||
1072 | if (need_out) | |
1073 | proc_out = fdout[1]; | |
1074 | else if (async->out) | |
1075 | proc_out = async->out; | |
1076 | else | |
1077 | proc_out = -1; | |
2d22c208 | 1078 | |
f6b60983 | 1079 | #ifdef NO_PTHREADS |
2c3766f0 AM |
1080 | /* Flush stdio before fork() to avoid cloning buffers */ |
1081 | fflush(NULL); | |
1082 | ||
2d22c208 JS |
1083 | async->pid = fork(); |
1084 | if (async->pid < 0) { | |
fbcb0e06 | 1085 | error_errno("fork (async) failed"); |
ae6a5609 | 1086 | goto error; |
2d22c208 JS |
1087 | } |
1088 | if (!async->pid) { | |
ae6a5609 EFL |
1089 | if (need_in) |
1090 | close(fdin[1]); | |
1091 | if (need_out) | |
1092 | close(fdout[0]); | |
0f4b6db3 | 1093 | git_atexit_clear(); |
661a8cf4 | 1094 | process_is_async = 1; |
ae6a5609 | 1095 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 1096 | } |
ae6a5609 | 1097 | |
ac2fbaa6 | 1098 | mark_child_for_cleanup(async->pid, NULL); |
afe19ff7 | 1099 | |
ae6a5609 EFL |
1100 | if (need_in) |
1101 | close(fdin[0]); | |
1102 | else if (async->in) | |
1103 | close(async->in); | |
1104 | ||
1105 | if (need_out) | |
1106 | close(fdout[1]); | |
1107 | else if (async->out) | |
1108 | close(async->out); | |
618ebe9f | 1109 | #else |
0ea1c89b JS |
1110 | if (!main_thread_set) { |
1111 | /* | |
1112 | * We assume that the first time that start_async is called | |
1113 | * it is from the main thread. | |
1114 | */ | |
1115 | main_thread_set = 1; | |
1116 | main_thread = pthread_self(); | |
1117 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 1118 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 1119 | set_die_routine(die_async); |
1ece66bc | 1120 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
1121 | } |
1122 | ||
200a76b7 JS |
1123 | if (proc_in >= 0) |
1124 | set_cloexec(proc_in); | |
1125 | if (proc_out >= 0) | |
1126 | set_cloexec(proc_out); | |
ae6a5609 EFL |
1127 | async->proc_in = proc_in; |
1128 | async->proc_out = proc_out; | |
200a76b7 JS |
1129 | { |
1130 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
1131 | if (err) { | |
fbcb0e06 | 1132 | error_errno("cannot create thread"); |
200a76b7 JS |
1133 | goto error; |
1134 | } | |
618ebe9f JS |
1135 | } |
1136 | #endif | |
2d22c208 | 1137 | return 0; |
ae6a5609 EFL |
1138 | |
1139 | error: | |
1140 | if (need_in) | |
1141 | close_pair(fdin); | |
1142 | else if (async->in) | |
1143 | close(async->in); | |
1144 | ||
1145 | if (need_out) | |
1146 | close_pair(fdout); | |
1147 | else if (async->out) | |
1148 | close(async->out); | |
1149 | return -1; | |
2d22c208 JS |
1150 | } |
1151 | ||
1152 | int finish_async(struct async *async) | |
1153 | { | |
f6b60983 | 1154 | #ifdef NO_PTHREADS |
507d7804 | 1155 | return wait_or_whine(async->pid, "child process", 0); |
618ebe9f | 1156 | #else |
200a76b7 JS |
1157 | void *ret = (void *)(intptr_t)(-1); |
1158 | ||
1159 | if (pthread_join(async->tid, &ret)) | |
1160 | error("pthread_join failed"); | |
1161 | return (int)(intptr_t)ret; | |
618ebe9f | 1162 | #endif |
2d22c208 | 1163 | } |
ae98a008 | 1164 | |
dcf69262 | 1165 | const char *find_hook(const char *name) |
5a7da2dc | 1166 | { |
03f2c773 | 1167 | static struct strbuf path = STRBUF_INIT; |
5a7da2dc | 1168 | |
03f2c773 | 1169 | strbuf_reset(&path); |
9445b492 | 1170 | strbuf_git_path(&path, "hooks/%s", name); |
235be51f JS |
1171 | if (access(path.buf, X_OK) < 0) { |
1172 | #ifdef STRIP_EXTENSION | |
1173 | strbuf_addstr(&path, STRIP_EXTENSION); | |
1174 | if (access(path.buf, X_OK) >= 0) | |
1175 | return path.buf; | |
1176 | #endif | |
03f2c773 | 1177 | return NULL; |
235be51f | 1178 | } |
03f2c773 | 1179 | return path.buf; |
5a7da2dc AS |
1180 | } |
1181 | ||
15048f8a | 1182 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 1183 | { |
d3180279 | 1184 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 1185 | const char *p; |
ae98a008 | 1186 | |
5a7da2dc AS |
1187 | p = find_hook(name); |
1188 | if (!p) | |
cf94ca8e SB |
1189 | return 0; |
1190 | ||
d1d09456 RS |
1191 | argv_array_push(&hook.args, p); |
1192 | while ((p = va_arg(args, const char *))) | |
1193 | argv_array_push(&hook.args, p); | |
15048f8a | 1194 | hook.env = env; |
ae98a008 SB |
1195 | hook.no_stdin = 1; |
1196 | hook.stdout_to_stderr = 1; | |
ae98a008 | 1197 | |
d1d09456 | 1198 | return run_command(&hook); |
ae98a008 | 1199 | } |
15048f8a BP |
1200 | |
1201 | int run_hook_le(const char *const *env, const char *name, ...) | |
1202 | { | |
1203 | va_list args; | |
1204 | int ret; | |
1205 | ||
1206 | va_start(args, name); | |
1207 | ret = run_hook_ve(env, name, args); | |
1208 | va_end(args); | |
1209 | ||
1210 | return ret; | |
1211 | } | |
911ec99b | 1212 | |
96335bcf JK |
1213 | struct io_pump { |
1214 | /* initialized by caller */ | |
1215 | int fd; | |
1216 | int type; /* POLLOUT or POLLIN */ | |
1217 | union { | |
1218 | struct { | |
1219 | const char *buf; | |
1220 | size_t len; | |
1221 | } out; | |
1222 | struct { | |
1223 | struct strbuf *buf; | |
1224 | size_t hint; | |
1225 | } in; | |
1226 | } u; | |
1227 | ||
1228 | /* returned by pump_io */ | |
1229 | int error; /* 0 for success, otherwise errno */ | |
1230 | ||
1231 | /* internal use */ | |
1232 | struct pollfd *pfd; | |
1233 | }; | |
1234 | ||
1235 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
1236 | { | |
1237 | int pollsize = 0; | |
1238 | int i; | |
1239 | ||
1240 | for (i = 0; i < nr; i++) { | |
1241 | struct io_pump *io = &slots[i]; | |
1242 | if (io->fd < 0) | |
1243 | continue; | |
1244 | pfd[pollsize].fd = io->fd; | |
1245 | pfd[pollsize].events = io->type; | |
1246 | io->pfd = &pfd[pollsize++]; | |
1247 | } | |
1248 | ||
1249 | if (!pollsize) | |
1250 | return 0; | |
1251 | ||
1252 | if (poll(pfd, pollsize, -1) < 0) { | |
1253 | if (errno == EINTR) | |
1254 | return 1; | |
1255 | die_errno("poll failed"); | |
1256 | } | |
1257 | ||
1258 | for (i = 0; i < nr; i++) { | |
1259 | struct io_pump *io = &slots[i]; | |
1260 | ||
1261 | if (io->fd < 0) | |
1262 | continue; | |
1263 | ||
1264 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
1265 | continue; | |
1266 | ||
1267 | if (io->type == POLLOUT) { | |
1268 | ssize_t len = xwrite(io->fd, | |
1269 | io->u.out.buf, io->u.out.len); | |
1270 | if (len < 0) { | |
1271 | io->error = errno; | |
1272 | close(io->fd); | |
1273 | io->fd = -1; | |
1274 | } else { | |
1275 | io->u.out.buf += len; | |
1276 | io->u.out.len -= len; | |
1277 | if (!io->u.out.len) { | |
1278 | close(io->fd); | |
1279 | io->fd = -1; | |
1280 | } | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | if (io->type == POLLIN) { | |
1285 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
1286 | io->fd, io->u.in.hint); | |
1287 | if (len < 0) | |
1288 | io->error = errno; | |
1289 | if (len <= 0) { | |
1290 | close(io->fd); | |
1291 | io->fd = -1; | |
1292 | } | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | return 1; | |
1297 | } | |
1298 | ||
1299 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 1300 | { |
96335bcf JK |
1301 | struct pollfd *pfd; |
1302 | int i; | |
1303 | ||
1304 | for (i = 0; i < nr; i++) | |
1305 | slots[i].error = 0; | |
1306 | ||
1307 | ALLOC_ARRAY(pfd, nr); | |
1308 | while (pump_io_round(slots, nr, pfd)) | |
1309 | ; /* nothing */ | |
1310 | free(pfd); | |
1311 | ||
1312 | /* There may be multiple errno values, so just pick the first. */ | |
1313 | for (i = 0; i < nr; i++) { | |
1314 | if (slots[i].error) { | |
1315 | errno = slots[i].error; | |
1316 | return -1; | |
1317 | } | |
1318 | } | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | ||
1323 | int pipe_command(struct child_process *cmd, | |
1324 | const char *in, size_t in_len, | |
1325 | struct strbuf *out, size_t out_hint, | |
1326 | struct strbuf *err, size_t err_hint) | |
1327 | { | |
1328 | struct io_pump io[3]; | |
1329 | int nr = 0; | |
1330 | ||
1331 | if (in) | |
1332 | cmd->in = -1; | |
1333 | if (out) | |
1334 | cmd->out = -1; | |
1335 | if (err) | |
1336 | cmd->err = -1; | |
1337 | ||
911ec99b JK |
1338 | if (start_command(cmd) < 0) |
1339 | return -1; | |
1340 | ||
96335bcf JK |
1341 | if (in) { |
1342 | io[nr].fd = cmd->in; | |
1343 | io[nr].type = POLLOUT; | |
1344 | io[nr].u.out.buf = in; | |
1345 | io[nr].u.out.len = in_len; | |
1346 | nr++; | |
1347 | } | |
1348 | if (out) { | |
1349 | io[nr].fd = cmd->out; | |
1350 | io[nr].type = POLLIN; | |
1351 | io[nr].u.in.buf = out; | |
1352 | io[nr].u.in.hint = out_hint; | |
1353 | nr++; | |
1354 | } | |
1355 | if (err) { | |
1356 | io[nr].fd = cmd->err; | |
1357 | io[nr].type = POLLIN; | |
1358 | io[nr].u.in.buf = err; | |
1359 | io[nr].u.in.hint = err_hint; | |
1360 | nr++; | |
1361 | } | |
1362 | ||
1363 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1364 | finish_command(cmd); /* throw away exit code */ |
1365 | return -1; | |
1366 | } | |
1367 | ||
911ec99b JK |
1368 | return finish_command(cmd); |
1369 | } | |
c553c72e SB |
1370 | |
1371 | enum child_state { | |
1372 | GIT_CP_FREE, | |
1373 | GIT_CP_WORKING, | |
1374 | GIT_CP_WAIT_CLEANUP, | |
1375 | }; | |
1376 | ||
1377 | struct parallel_processes { | |
1378 | void *data; | |
1379 | ||
1380 | int max_processes; | |
1381 | int nr_processes; | |
1382 | ||
1383 | get_next_task_fn get_next_task; | |
1384 | start_failure_fn start_failure; | |
1385 | task_finished_fn task_finished; | |
1386 | ||
1387 | struct { | |
1388 | enum child_state state; | |
1389 | struct child_process process; | |
1390 | struct strbuf err; | |
1391 | void *data; | |
1392 | } *children; | |
1393 | /* | |
1394 | * The struct pollfd is logically part of *children, | |
1395 | * but the system call expects it as its own array. | |
1396 | */ | |
1397 | struct pollfd *pfd; | |
1398 | ||
1399 | unsigned shutdown : 1; | |
1400 | ||
1401 | int output_owner; | |
1402 | struct strbuf buffered_output; /* of finished children */ | |
1403 | }; | |
1404 | ||
aa710494 | 1405 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1406 | void *pp_cb, |
1407 | void *pp_task_cb) | |
1408 | { | |
c553c72e SB |
1409 | return 0; |
1410 | } | |
1411 | ||
1412 | static int default_task_finished(int result, | |
aa710494 | 1413 | struct strbuf *out, |
c553c72e SB |
1414 | void *pp_cb, |
1415 | void *pp_task_cb) | |
1416 | { | |
c553c72e SB |
1417 | return 0; |
1418 | } | |
1419 | ||
1420 | static void kill_children(struct parallel_processes *pp, int signo) | |
1421 | { | |
1422 | int i, n = pp->max_processes; | |
1423 | ||
1424 | for (i = 0; i < n; i++) | |
1425 | if (pp->children[i].state == GIT_CP_WORKING) | |
1426 | kill(pp->children[i].process.pid, signo); | |
1427 | } | |
1428 | ||
1429 | static struct parallel_processes *pp_for_signal; | |
1430 | ||
1431 | static void handle_children_on_signal(int signo) | |
1432 | { | |
1433 | kill_children(pp_for_signal, signo); | |
1434 | sigchain_pop(signo); | |
1435 | raise(signo); | |
1436 | } | |
1437 | ||
1438 | static void pp_init(struct parallel_processes *pp, | |
1439 | int n, | |
1440 | get_next_task_fn get_next_task, | |
1441 | start_failure_fn start_failure, | |
1442 | task_finished_fn task_finished, | |
1443 | void *data) | |
1444 | { | |
1445 | int i; | |
1446 | ||
1447 | if (n < 1) | |
1448 | n = online_cpus(); | |
1449 | ||
1450 | pp->max_processes = n; | |
1451 | ||
1452 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1453 | ||
1454 | pp->data = data; | |
1455 | if (!get_next_task) | |
1456 | die("BUG: you need to specify a get_next_task function"); | |
1457 | pp->get_next_task = get_next_task; | |
1458 | ||
1459 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1460 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1461 | ||
1462 | pp->nr_processes = 0; | |
1463 | pp->output_owner = 0; | |
1464 | pp->shutdown = 0; | |
1465 | pp->children = xcalloc(n, sizeof(*pp->children)); | |
1466 | pp->pfd = xcalloc(n, sizeof(*pp->pfd)); | |
1467 | strbuf_init(&pp->buffered_output, 0); | |
1468 | ||
1469 | for (i = 0; i < n; i++) { | |
1470 | strbuf_init(&pp->children[i].err, 0); | |
1471 | child_process_init(&pp->children[i].process); | |
1472 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1473 | pp->pfd[i].fd = -1; | |
1474 | } | |
1475 | ||
1476 | pp_for_signal = pp; | |
1477 | sigchain_push_common(handle_children_on_signal); | |
1478 | } | |
1479 | ||
1480 | static void pp_cleanup(struct parallel_processes *pp) | |
1481 | { | |
1482 | int i; | |
1483 | ||
1484 | trace_printf("run_processes_parallel: done"); | |
1485 | for (i = 0; i < pp->max_processes; i++) { | |
1486 | strbuf_release(&pp->children[i].err); | |
1487 | child_process_clear(&pp->children[i].process); | |
1488 | } | |
1489 | ||
1490 | free(pp->children); | |
1491 | free(pp->pfd); | |
1492 | ||
1493 | /* | |
1494 | * When get_next_task added messages to the buffer in its last | |
1495 | * iteration, the buffered output is non empty. | |
1496 | */ | |
2dac9b56 | 1497 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1498 | strbuf_release(&pp->buffered_output); |
1499 | ||
1500 | sigchain_pop_common(); | |
1501 | } | |
1502 | ||
1503 | /* returns | |
1504 | * 0 if a new task was started. | |
1505 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1506 | * problem with starting a new command) | |
1507 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1508 | * to signal the children. | |
1509 | */ | |
1510 | static int pp_start_one(struct parallel_processes *pp) | |
1511 | { | |
1512 | int i, code; | |
1513 | ||
1514 | for (i = 0; i < pp->max_processes; i++) | |
1515 | if (pp->children[i].state == GIT_CP_FREE) | |
1516 | break; | |
1517 | if (i == pp->max_processes) | |
1518 | die("BUG: bookkeeping is hard"); | |
1519 | ||
1520 | code = pp->get_next_task(&pp->children[i].process, | |
1521 | &pp->children[i].err, | |
1522 | pp->data, | |
1523 | &pp->children[i].data); | |
1524 | if (!code) { | |
1525 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1526 | strbuf_reset(&pp->children[i].err); | |
1527 | return 1; | |
1528 | } | |
1529 | pp->children[i].process.err = -1; | |
1530 | pp->children[i].process.stdout_to_stderr = 1; | |
1531 | pp->children[i].process.no_stdin = 1; | |
1532 | ||
1533 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1534 | code = pp->start_failure(&pp->children[i].err, |
c553c72e SB |
1535 | pp->data, |
1536 | &pp->children[i].data); | |
1537 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1538 | strbuf_reset(&pp->children[i].err); | |
1539 | if (code) | |
1540 | pp->shutdown = 1; | |
1541 | return code; | |
1542 | } | |
1543 | ||
1544 | pp->nr_processes++; | |
1545 | pp->children[i].state = GIT_CP_WORKING; | |
1546 | pp->pfd[i].fd = pp->children[i].process.err; | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1551 | { | |
1552 | int i; | |
1553 | ||
1554 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1555 | if (errno == EINTR) | |
1556 | continue; | |
1557 | pp_cleanup(pp); | |
1558 | die_errno("poll"); | |
1559 | } | |
1560 | ||
1561 | /* Buffer output from all pipes. */ | |
1562 | for (i = 0; i < pp->max_processes; i++) { | |
1563 | if (pp->children[i].state == GIT_CP_WORKING && | |
1564 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1565 | int n = strbuf_read_once(&pp->children[i].err, | |
1566 | pp->children[i].process.err, 0); | |
1567 | if (n == 0) { | |
1568 | close(pp->children[i].process.err); | |
1569 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1570 | } else if (n < 0) | |
1571 | if (errno != EAGAIN) | |
1572 | die_errno("read"); | |
1573 | } | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | static void pp_output(struct parallel_processes *pp) | |
1578 | { | |
1579 | int i = pp->output_owner; | |
1580 | if (pp->children[i].state == GIT_CP_WORKING && | |
1581 | pp->children[i].err.len) { | |
2dac9b56 | 1582 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1583 | strbuf_reset(&pp->children[i].err); |
1584 | } | |
1585 | } | |
1586 | ||
1587 | static int pp_collect_finished(struct parallel_processes *pp) | |
1588 | { | |
1589 | int i, code; | |
1590 | int n = pp->max_processes; | |
1591 | int result = 0; | |
1592 | ||
1593 | while (pp->nr_processes > 0) { | |
1594 | for (i = 0; i < pp->max_processes; i++) | |
1595 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1596 | break; | |
1597 | if (i == pp->max_processes) | |
1598 | break; | |
1599 | ||
1600 | code = finish_command(&pp->children[i].process); | |
1601 | ||
2a73b3da | 1602 | code = pp->task_finished(code, |
c553c72e SB |
1603 | &pp->children[i].err, pp->data, |
1604 | &pp->children[i].data); | |
1605 | ||
1606 | if (code) | |
1607 | result = code; | |
1608 | if (code < 0) | |
1609 | break; | |
1610 | ||
1611 | pp->nr_processes--; | |
1612 | pp->children[i].state = GIT_CP_FREE; | |
1613 | pp->pfd[i].fd = -1; | |
1614 | child_process_init(&pp->children[i].process); | |
1615 | ||
1616 | if (i != pp->output_owner) { | |
1617 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1618 | strbuf_reset(&pp->children[i].err); | |
1619 | } else { | |
2dac9b56 | 1620 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1621 | strbuf_reset(&pp->children[i].err); |
1622 | ||
1623 | /* Output all other finished child processes */ | |
2dac9b56 | 1624 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1625 | strbuf_reset(&pp->buffered_output); |
1626 | ||
1627 | /* | |
1628 | * Pick next process to output live. | |
1629 | * NEEDSWORK: | |
1630 | * For now we pick it randomly by doing a round | |
1631 | * robin. Later we may want to pick the one with | |
1632 | * the most output or the longest or shortest | |
1633 | * running process time. | |
1634 | */ | |
1635 | for (i = 0; i < n; i++) | |
1636 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1637 | break; | |
1638 | pp->output_owner = (pp->output_owner + i) % n; | |
1639 | } | |
1640 | } | |
1641 | return result; | |
1642 | } | |
1643 | ||
1644 | int run_processes_parallel(int n, | |
1645 | get_next_task_fn get_next_task, | |
1646 | start_failure_fn start_failure, | |
1647 | task_finished_fn task_finished, | |
1648 | void *pp_cb) | |
1649 | { | |
1650 | int i, code; | |
1651 | int output_timeout = 100; | |
1652 | int spawn_cap = 4; | |
1653 | struct parallel_processes pp; | |
1654 | ||
1655 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1656 | while (1) { | |
1657 | for (i = 0; | |
1658 | i < spawn_cap && !pp.shutdown && | |
1659 | pp.nr_processes < pp.max_processes; | |
1660 | i++) { | |
1661 | code = pp_start_one(&pp); | |
1662 | if (!code) | |
1663 | continue; | |
1664 | if (code < 0) { | |
1665 | pp.shutdown = 1; | |
1666 | kill_children(&pp, -code); | |
1667 | } | |
1668 | break; | |
1669 | } | |
1670 | if (!pp.nr_processes) | |
1671 | break; | |
1672 | pp_buffer_stderr(&pp, output_timeout); | |
1673 | pp_output(&pp); | |
1674 | code = pp_collect_finished(&pp); | |
1675 | if (code) { | |
1676 | pp.shutdown = 1; | |
1677 | if (code < 0) | |
1678 | kill_children(&pp, -code); | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | pp_cleanup(&pp); | |
1683 | return 0; | |
1684 | } |