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