]>
Commit | Line | Data |
---|---|---|
b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
d807c4a0 | 3 | #include "exec-cmd.h" |
afe19ff7 | 4 | #include "sigchain.h" |
dbbcd44f | 5 | #include "strvec.h" |
c553c72e SB |
6 | #include "thread-utils.h" |
7 | #include "strbuf.h" | |
f805a00a | 8 | #include "string-list.h" |
e73dd786 | 9 | #include "quote.h" |
1942d483 | 10 | #include "config.h" |
b1bf95bb | 11 | |
483bbd4e RS |
12 | void child_process_init(struct child_process *child) |
13 | { | |
5726a6b4 ÆAB |
14 | struct child_process blank = CHILD_PROCESS_INIT; |
15 | memcpy(child, &blank, sizeof(*child)); | |
483bbd4e RS |
16 | } |
17 | ||
2d71608e RS |
18 | void child_process_clear(struct child_process *child) |
19 | { | |
c972bf4c JK |
20 | strvec_clear(&child->args); |
21 | strvec_clear(&child->env_array); | |
2d71608e RS |
22 | } |
23 | ||
afe19ff7 JK |
24 | struct child_to_clean { |
25 | pid_t pid; | |
ac2fbaa6 | 26 | struct child_process *process; |
afe19ff7 JK |
27 | struct child_to_clean *next; |
28 | }; | |
29 | static struct child_to_clean *children_to_clean; | |
30 | static int installed_child_cleanup_handler; | |
31 | ||
507d7804 | 32 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 | 33 | { |
46df6906 JK |
34 | struct child_to_clean *children_to_wait_for = NULL; |
35 | ||
afe19ff7 JK |
36 | while (children_to_clean) { |
37 | struct child_to_clean *p = children_to_clean; | |
38 | children_to_clean = p->next; | |
ac2fbaa6 LS |
39 | |
40 | if (p->process && !in_signal) { | |
41 | struct child_process *process = p->process; | |
42 | if (process->clean_on_exit_handler) { | |
43 | trace_printf( | |
44 | "trace: run_command: running exit handler for pid %" | |
45 | PRIuMAX, (uintmax_t)p->pid | |
46 | ); | |
47 | process->clean_on_exit_handler(process); | |
48 | } | |
49 | } | |
50 | ||
afe19ff7 | 51 | kill(p->pid, sig); |
46df6906 | 52 | |
7b91929b | 53 | if (p->process && p->process->wait_after_clean) { |
46df6906 JK |
54 | p->next = children_to_wait_for; |
55 | children_to_wait_for = p; | |
56 | } else { | |
57 | if (!in_signal) | |
58 | free(p); | |
59 | } | |
60 | } | |
61 | ||
62 | while (children_to_wait_for) { | |
63 | struct child_to_clean *p = children_to_wait_for; | |
64 | children_to_wait_for = p->next; | |
65 | ||
66 | while (waitpid(p->pid, NULL, 0) < 0 && errno == EINTR) | |
67 | ; /* spin waiting for process exit or error */ | |
68 | ||
507d7804 TI |
69 | if (!in_signal) |
70 | free(p); | |
afe19ff7 JK |
71 | } |
72 | } | |
73 | ||
74 | static void cleanup_children_on_signal(int sig) | |
75 | { | |
507d7804 | 76 | cleanup_children(sig, 1); |
afe19ff7 JK |
77 | sigchain_pop(sig); |
78 | raise(sig); | |
79 | } | |
80 | ||
81 | static void cleanup_children_on_exit(void) | |
82 | { | |
507d7804 | 83 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
84 | } |
85 | ||
ac2fbaa6 | 86 | static void mark_child_for_cleanup(pid_t pid, struct child_process *process) |
afe19ff7 JK |
87 | { |
88 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
89 | p->pid = pid; | |
ac2fbaa6 | 90 | p->process = process; |
afe19ff7 JK |
91 | p->next = children_to_clean; |
92 | children_to_clean = p; | |
93 | ||
94 | if (!installed_child_cleanup_handler) { | |
95 | atexit(cleanup_children_on_exit); | |
96 | sigchain_push_common(cleanup_children_on_signal); | |
97 | installed_child_cleanup_handler = 1; | |
98 | } | |
99 | } | |
100 | ||
101 | static void clear_child_for_cleanup(pid_t pid) | |
102 | { | |
bdee397d | 103 | struct child_to_clean **pp; |
afe19ff7 | 104 | |
bdee397d DG |
105 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
106 | struct child_to_clean *clean_me = *pp; | |
107 | ||
108 | if (clean_me->pid == pid) { | |
109 | *pp = clean_me->next; | |
110 | free(clean_me); | |
afe19ff7 JK |
111 | return; |
112 | } | |
113 | } | |
114 | } | |
115 | ||
9dc09c76 SP |
116 | static inline void close_pair(int fd[2]) |
117 | { | |
118 | close(fd[0]); | |
119 | close(fd[1]); | |
120 | } | |
121 | ||
38124a40 BW |
122 | int is_executable(const char *name) |
123 | { | |
124 | struct stat st; | |
125 | ||
126 | if (stat(name, &st) || /* stat, not lstat */ | |
127 | !S_ISREG(st.st_mode)) | |
128 | return 0; | |
129 | ||
130 | #if defined(GIT_WINDOWS_NATIVE) | |
131 | /* | |
132 | * On Windows there is no executable bit. The file extension | |
133 | * indicates whether it can be run as an executable, and Git | |
134 | * has special-handling to detect scripts and launch them | |
135 | * through the indicated script interpreter. We test for the | |
136 | * file extension first because virus scanners may make | |
137 | * it quite expensive to open many files. | |
138 | */ | |
139 | if (ends_with(name, ".exe")) | |
140 | return S_IXUSR; | |
141 | ||
142 | { | |
143 | /* | |
144 | * Now that we know it does not have an executable extension, | |
145 | * peek into the file instead. | |
146 | */ | |
147 | char buf[3] = { 0 }; | |
148 | int n; | |
149 | int fd = open(name, O_RDONLY); | |
150 | st.st_mode &= ~S_IXUSR; | |
151 | if (fd >= 0) { | |
152 | n = read(fd, buf, 2); | |
153 | if (n == 2) | |
154 | /* look for a she-bang */ | |
155 | if (!strcmp(buf, "#!")) | |
156 | st.st_mode |= S_IXUSR; | |
157 | close(fd); | |
158 | } | |
159 | } | |
160 | #endif | |
161 | return st.st_mode & S_IXUSR; | |
162 | } | |
163 | ||
94028310 BW |
164 | /* |
165 | * Search $PATH for a command. This emulates the path search that | |
166 | * execvp would perform, without actually executing the command so it | |
167 | * can be used before fork() to prepare to run a command using | |
168 | * execve() or after execvp() to diagnose why it failed. | |
169 | * | |
170 | * The caller should ensure that file contains no directory | |
171 | * separators. | |
172 | * | |
173 | * Returns the path to the command, as found in $PATH or NULL if the | |
174 | * command could not be found. The caller inherits ownership of the memory | |
175 | * used to store the resultant path. | |
176 | * | |
177 | * This should not be used on Windows, where the $PATH search rules | |
178 | * are more complicated (e.g., a search for "foo" should find | |
179 | * "foo.exe"). | |
180 | */ | |
38f865c2 JK |
181 | static char *locate_in_PATH(const char *file) |
182 | { | |
183 | const char *p = getenv("PATH"); | |
184 | struct strbuf buf = STRBUF_INIT; | |
185 | ||
186 | if (!p || !*p) | |
187 | return NULL; | |
188 | ||
189 | while (1) { | |
190 | const char *end = strchrnul(p, ':'); | |
191 | ||
192 | strbuf_reset(&buf); | |
193 | ||
194 | /* POSIX specifies an empty entry as the current directory. */ | |
195 | if (end != p) { | |
196 | strbuf_add(&buf, p, end - p); | |
197 | strbuf_addch(&buf, '/'); | |
198 | } | |
199 | strbuf_addstr(&buf, file); | |
200 | ||
94028310 | 201 | if (is_executable(buf.buf)) |
38f865c2 JK |
202 | return strbuf_detach(&buf, NULL); |
203 | ||
204 | if (!*end) | |
205 | break; | |
206 | p = end + 1; | |
207 | } | |
208 | ||
209 | strbuf_release(&buf); | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | static int exists_in_PATH(const char *file) | |
214 | { | |
215 | char *r = locate_in_PATH(file); | |
63ab08fb | 216 | int found = r != NULL; |
38f865c2 | 217 | free(r); |
63ab08fb | 218 | return found; |
38f865c2 JK |
219 | } |
220 | ||
221 | int sane_execvp(const char *file, char * const argv[]) | |
222 | { | |
ee4512ed JH |
223 | #ifndef GIT_WINDOWS_NATIVE |
224 | /* | |
225 | * execvp() doesn't return, so we all we can do is tell trace2 | |
226 | * what we are about to do and let it leave a hint in the log | |
227 | * (unless of course the execvp() fails). | |
228 | * | |
229 | * we skip this for Windows because the compat layer already | |
230 | * has to emulate the execvp() call anyway. | |
231 | */ | |
232 | int exec_id = trace2_exec(file, (const char **)argv); | |
233 | #endif | |
234 | ||
38f865c2 JK |
235 | if (!execvp(file, argv)) |
236 | return 0; /* cannot happen ;-) */ | |
237 | ||
ee4512ed JH |
238 | #ifndef GIT_WINDOWS_NATIVE |
239 | { | |
240 | int ec = errno; | |
241 | trace2_exec_result(exec_id, ec); | |
242 | errno = ec; | |
243 | } | |
244 | #endif | |
245 | ||
38f865c2 JK |
246 | /* |
247 | * When a command can't be found because one of the directories | |
248 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
249 | * careful usability testing (read: analysis of occasional bug | |
250 | * reports) reveals that "No such file or directory" is more | |
251 | * intuitive. | |
252 | * | |
253 | * We avoid commands with "/", because execvp will not do $PATH | |
254 | * lookups in that case. | |
255 | * | |
256 | * The reassignment of EACCES to errno looks like a no-op below, | |
257 | * but we need to protect against exists_in_PATH overwriting errno. | |
258 | */ | |
259 | if (errno == EACCES && !strchr(file, '/')) | |
260 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
261 | else if (errno == ENOTDIR && !strchr(file, '/')) |
262 | errno = ENOENT; | |
38f865c2 JK |
263 | return -1; |
264 | } | |
265 | ||
c972bf4c | 266 | static const char **prepare_shell_cmd(struct strvec *out, const char **argv) |
8dba1e63 | 267 | { |
20574f55 | 268 | if (!argv[0]) |
033abf97 | 269 | BUG("shell command is empty"); |
8dba1e63 | 270 | |
f445644f | 271 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 272 | #ifndef GIT_WINDOWS_NATIVE |
c972bf4c | 273 | strvec_push(out, SHELL_PATH); |
77629754 | 274 | #else |
c972bf4c | 275 | strvec_push(out, "sh"); |
77629754 | 276 | #endif |
c972bf4c | 277 | strvec_push(out, "-c"); |
8dba1e63 | 278 | |
20574f55 JK |
279 | /* |
280 | * If we have no extra arguments, we do not even need to | |
281 | * bother with the "$@" magic. | |
282 | */ | |
283 | if (!argv[1]) | |
c972bf4c | 284 | strvec_push(out, argv[0]); |
20574f55 | 285 | else |
c972bf4c | 286 | strvec_pushf(out, "%s \"$@\"", argv[0]); |
20574f55 | 287 | } |
8dba1e63 | 288 | |
c972bf4c | 289 | strvec_pushv(out, argv); |
d70a9eb6 | 290 | return out->v; |
8dba1e63 JK |
291 | } |
292 | ||
380395d0 | 293 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
294 | static int child_notifier = -1; |
295 | ||
79319b19 BW |
296 | enum child_errcode { |
297 | CHILD_ERR_CHDIR, | |
53fa6753 BW |
298 | CHILD_ERR_DUP2, |
299 | CHILD_ERR_CLOSE, | |
45afb1ca | 300 | CHILD_ERR_SIGPROCMASK, |
79319b19 BW |
301 | CHILD_ERR_ENOENT, |
302 | CHILD_ERR_SILENT, | |
303 | CHILD_ERR_ERRNO | |
304 | }; | |
305 | ||
306 | struct child_err { | |
307 | enum child_errcode err; | |
308 | int syserr; /* errno */ | |
309 | }; | |
310 | ||
311 | static void child_die(enum child_errcode err) | |
2b541bf8 | 312 | { |
79319b19 BW |
313 | struct child_err buf; |
314 | ||
315 | buf.err = err; | |
316 | buf.syserr = errno; | |
317 | ||
318 | /* write(2) on buf smaller than PIPE_BUF (min 512) is atomic: */ | |
319 | xwrite(child_notifier, &buf, sizeof(buf)); | |
320 | _exit(1); | |
321 | } | |
322 | ||
53fa6753 BW |
323 | static void child_dup2(int fd, int to) |
324 | { | |
325 | if (dup2(fd, to) < 0) | |
326 | child_die(CHILD_ERR_DUP2); | |
327 | } | |
328 | ||
329 | static void child_close(int fd) | |
330 | { | |
331 | if (close(fd)) | |
332 | child_die(CHILD_ERR_CLOSE); | |
333 | } | |
334 | ||
335 | static void child_close_pair(int fd[2]) | |
336 | { | |
337 | child_close(fd[0]); | |
338 | child_close(fd[1]); | |
339 | } | |
340 | ||
79319b19 BW |
341 | /* |
342 | * parent will make it look like the child spewed a fatal error and died | |
343 | * this is needed to prevent changes to t0061. | |
344 | */ | |
345 | static void fake_fatal(const char *err, va_list params) | |
346 | { | |
347 | vreportf("fatal: ", err, params); | |
348 | } | |
349 | ||
350 | static void child_error_fn(const char *err, va_list params) | |
351 | { | |
352 | const char msg[] = "error() should not be called in child\n"; | |
353 | xwrite(2, msg, sizeof(msg) - 1); | |
354 | } | |
355 | ||
356 | static void child_warn_fn(const char *err, va_list params) | |
357 | { | |
358 | const char msg[] = "warn() should not be called in child\n"; | |
359 | xwrite(2, msg, sizeof(msg) - 1); | |
360 | } | |
361 | ||
362 | static void NORETURN child_die_fn(const char *err, va_list params) | |
363 | { | |
364 | const char msg[] = "die() should not be called in child\n"; | |
365 | xwrite(2, msg, sizeof(msg) - 1); | |
366 | _exit(2); | |
367 | } | |
368 | ||
369 | /* this runs in the parent process */ | |
370 | static void child_err_spew(struct child_process *cmd, struct child_err *cerr) | |
371 | { | |
372 | static void (*old_errfn)(const char *err, va_list params); | |
373 | ||
374 | old_errfn = get_error_routine(); | |
375 | set_error_routine(fake_fatal); | |
376 | errno = cerr->syserr; | |
377 | ||
378 | switch (cerr->err) { | |
379 | case CHILD_ERR_CHDIR: | |
380 | error_errno("exec '%s': cd to '%s' failed", | |
381 | cmd->argv[0], cmd->dir); | |
382 | break; | |
53fa6753 BW |
383 | case CHILD_ERR_DUP2: |
384 | error_errno("dup2() in child failed"); | |
385 | break; | |
386 | case CHILD_ERR_CLOSE: | |
387 | error_errno("close() in child failed"); | |
388 | break; | |
45afb1ca EW |
389 | case CHILD_ERR_SIGPROCMASK: |
390 | error_errno("sigprocmask failed restoring signals"); | |
391 | break; | |
79319b19 BW |
392 | case CHILD_ERR_ENOENT: |
393 | error_errno("cannot run %s", cmd->argv[0]); | |
394 | break; | |
395 | case CHILD_ERR_SILENT: | |
396 | break; | |
397 | case CHILD_ERR_ERRNO: | |
398 | error_errno("cannot exec '%s'", cmd->argv[0]); | |
399 | break; | |
400 | } | |
401 | set_error_routine(old_errfn); | |
2b541bf8 | 402 | } |
3967e25b | 403 | |
c972bf4c | 404 | static int prepare_cmd(struct strvec *out, const struct child_process *cmd) |
3967e25b BW |
405 | { |
406 | if (!cmd->argv[0]) | |
033abf97 | 407 | BUG("command is empty"); |
3967e25b | 408 | |
e3a43446 BW |
409 | /* |
410 | * Add SHELL_PATH so in the event exec fails with ENOEXEC we can | |
411 | * attempt to interpret the command with 'sh'. | |
412 | */ | |
c972bf4c | 413 | strvec_push(out, SHELL_PATH); |
e3a43446 | 414 | |
3967e25b | 415 | if (cmd->git_cmd) { |
54a7a646 | 416 | prepare_git_cmd(out, cmd->argv); |
3967e25b BW |
417 | } else if (cmd->use_shell) { |
418 | prepare_shell_cmd(out, cmd->argv); | |
419 | } else { | |
c972bf4c | 420 | strvec_pushv(out, cmd->argv); |
3967e25b | 421 | } |
e3a43446 BW |
422 | |
423 | /* | |
05ac8582 AK |
424 | * If there are no dir separator characters in the command then perform |
425 | * a path lookup and use the resolved path as the command to exec. If | |
426 | * there are dir separator characters, we have exec attempt to invoke | |
427 | * the command directly. | |
e3a43446 | 428 | */ |
d70a9eb6 JK |
429 | if (!has_dir_sep(out->v[1])) { |
430 | char *program = locate_in_PATH(out->v[1]); | |
e3a43446 | 431 | if (program) { |
d70a9eb6 JK |
432 | free((char *)out->v[1]); |
433 | out->v[1] = program; | |
321fd823 | 434 | } else { |
c972bf4c | 435 | strvec_clear(out); |
321fd823 JK |
436 | errno = ENOENT; |
437 | return -1; | |
e3a43446 BW |
438 | } |
439 | } | |
321fd823 JK |
440 | |
441 | return 0; | |
3967e25b | 442 | } |
ae25394b BW |
443 | |
444 | static char **prep_childenv(const char *const *deltaenv) | |
445 | { | |
446 | extern char **environ; | |
447 | char **childenv; | |
448 | struct string_list env = STRING_LIST_INIT_DUP; | |
449 | struct strbuf key = STRBUF_INIT; | |
450 | const char *const *p; | |
451 | int i; | |
452 | ||
453 | /* Construct a sorted string list consisting of the current environ */ | |
454 | for (p = (const char *const *) environ; p && *p; p++) { | |
455 | const char *equals = strchr(*p, '='); | |
456 | ||
457 | if (equals) { | |
458 | strbuf_reset(&key); | |
459 | strbuf_add(&key, *p, equals - *p); | |
460 | string_list_append(&env, key.buf)->util = (void *) *p; | |
461 | } else { | |
462 | string_list_append(&env, *p)->util = (void *) *p; | |
463 | } | |
464 | } | |
465 | string_list_sort(&env); | |
466 | ||
467 | /* Merge in 'deltaenv' with the current environ */ | |
468 | for (p = deltaenv; p && *p; p++) { | |
469 | const char *equals = strchr(*p, '='); | |
470 | ||
471 | if (equals) { | |
472 | /* ('key=value'), insert or replace entry */ | |
473 | strbuf_reset(&key); | |
474 | strbuf_add(&key, *p, equals - *p); | |
475 | string_list_insert(&env, key.buf)->util = (void *) *p; | |
476 | } else { | |
477 | /* otherwise ('key') remove existing entry */ | |
478 | string_list_remove(&env, *p, 0); | |
479 | } | |
480 | } | |
481 | ||
482 | /* Create an array of 'char *' to be used as the childenv */ | |
0e187d75 | 483 | ALLOC_ARRAY(childenv, env.nr + 1); |
ae25394b BW |
484 | for (i = 0; i < env.nr; i++) |
485 | childenv[i] = env.items[i].util; | |
486 | childenv[env.nr] = NULL; | |
487 | ||
488 | string_list_clear(&env, 0); | |
489 | strbuf_release(&key); | |
490 | return childenv; | |
491 | } | |
45afb1ca EW |
492 | |
493 | struct atfork_state { | |
494 | #ifndef NO_PTHREADS | |
495 | int cs; | |
496 | #endif | |
497 | sigset_t old; | |
498 | }; | |
499 | ||
dde74d73 JS |
500 | #define CHECK_BUG(err, msg) \ |
501 | do { \ | |
502 | int e = (err); \ | |
503 | if (e) \ | |
504 | BUG("%s: %s", msg, strerror(e)); \ | |
505 | } while(0) | |
45afb1ca EW |
506 | |
507 | static void atfork_prepare(struct atfork_state *as) | |
508 | { | |
509 | sigset_t all; | |
510 | ||
511 | if (sigfillset(&all)) | |
512 | die_errno("sigfillset"); | |
513 | #ifdef NO_PTHREADS | |
514 | if (sigprocmask(SIG_SETMASK, &all, &as->old)) | |
515 | die_errno("sigprocmask"); | |
516 | #else | |
dde74d73 | 517 | CHECK_BUG(pthread_sigmask(SIG_SETMASK, &all, &as->old), |
45afb1ca | 518 | "blocking all signals"); |
dde74d73 | 519 | CHECK_BUG(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs), |
45afb1ca EW |
520 | "disabling cancellation"); |
521 | #endif | |
522 | } | |
523 | ||
524 | static void atfork_parent(struct atfork_state *as) | |
525 | { | |
526 | #ifdef NO_PTHREADS | |
527 | if (sigprocmask(SIG_SETMASK, &as->old, NULL)) | |
528 | die_errno("sigprocmask"); | |
529 | #else | |
dde74d73 | 530 | CHECK_BUG(pthread_setcancelstate(as->cs, NULL), |
45afb1ca | 531 | "re-enabling cancellation"); |
dde74d73 | 532 | CHECK_BUG(pthread_sigmask(SIG_SETMASK, &as->old, NULL), |
45afb1ca | 533 | "restoring signal mask"); |
200a76b7 | 534 | #endif |
45afb1ca EW |
535 | } |
536 | #endif /* GIT_WINDOWS_NATIVE */ | |
a5487ddf JS |
537 | |
538 | static inline void set_cloexec(int fd) | |
539 | { | |
540 | int flags = fcntl(fd, F_GETFD); | |
541 | if (flags >= 0) | |
542 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
543 | } | |
a5487ddf | 544 | |
507d7804 | 545 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
546 | { |
547 | int status, code = -1; | |
548 | pid_t waiting; | |
549 | int failed_errno = 0; | |
550 | ||
551 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
552 | ; /* nothing */ | |
85db79a9 | 553 | if (in_signal) { |
be8fc53e ÆAB |
554 | if (WIFEXITED(status)) |
555 | code = WEXITSTATUS(status); | |
556 | return code; | |
85db79a9 | 557 | } |
ab0b41da JS |
558 | |
559 | if (waiting < 0) { | |
560 | failed_errno = errno; | |
fbcb0e06 | 561 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
562 | } else if (waiting != pid) { |
563 | error("waitpid is confused (%s)", argv0); | |
564 | } else if (WIFSIGNALED(status)) { | |
565 | code = WTERMSIG(status); | |
ac78663b | 566 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 567 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
568 | /* |
569 | * This return value is chosen so that code & 0xff | |
570 | * mimics the exit code that a POSIX shell would report for | |
571 | * a program that died from this signal. | |
572 | */ | |
709ca730 | 573 | code += 128; |
ab0b41da JS |
574 | } else if (WIFEXITED(status)) { |
575 | code = WEXITSTATUS(status); | |
ab0b41da JS |
576 | } else { |
577 | error("waitpid is confused (%s)", argv0); | |
578 | } | |
afe19ff7 JK |
579 | |
580 | clear_child_for_cleanup(pid); | |
581 | ||
ab0b41da JS |
582 | errno = failed_errno; |
583 | return code; | |
584 | } | |
585 | ||
c61a975d NTND |
586 | static void trace_add_env(struct strbuf *dst, const char *const *deltaenv) |
587 | { | |
588 | struct string_list envs = STRING_LIST_INIT_DUP; | |
589 | const char *const *e; | |
590 | int i; | |
591 | int printed_unset = 0; | |
592 | ||
593 | /* Last one wins, see run-command.c:prep_childenv() for context */ | |
594 | for (e = deltaenv; e && *e; e++) { | |
595 | struct strbuf key = STRBUF_INIT; | |
596 | char *equals = strchr(*e, '='); | |
597 | ||
598 | if (equals) { | |
599 | strbuf_add(&key, *e, equals - *e); | |
600 | string_list_insert(&envs, key.buf)->util = equals + 1; | |
601 | } else { | |
602 | string_list_insert(&envs, *e)->util = NULL; | |
603 | } | |
604 | strbuf_release(&key); | |
605 | } | |
606 | ||
607 | /* "unset X Y...;" */ | |
608 | for (i = 0; i < envs.nr; i++) { | |
609 | const char *var = envs.items[i].string; | |
610 | const char *val = envs.items[i].util; | |
611 | ||
612 | if (val || !getenv(var)) | |
613 | continue; | |
614 | ||
615 | if (!printed_unset) { | |
616 | strbuf_addstr(dst, " unset"); | |
617 | printed_unset = 1; | |
618 | } | |
619 | strbuf_addf(dst, " %s", var); | |
620 | } | |
621 | if (printed_unset) | |
622 | strbuf_addch(dst, ';'); | |
623 | ||
624 | /* ... followed by "A=B C=D ..." */ | |
625 | for (i = 0; i < envs.nr; i++) { | |
626 | const char *var = envs.items[i].string; | |
627 | const char *val = envs.items[i].util; | |
628 | const char *oldval; | |
629 | ||
630 | if (!val) | |
631 | continue; | |
632 | ||
633 | oldval = getenv(var); | |
634 | if (oldval && !strcmp(val, oldval)) | |
635 | continue; | |
636 | ||
637 | strbuf_addf(dst, " %s=", var); | |
638 | sq_quote_buf_pretty(dst, val); | |
639 | } | |
640 | string_list_clear(&envs, 0); | |
641 | } | |
642 | ||
e73dd786 NTND |
643 | static void trace_run_command(const struct child_process *cp) |
644 | { | |
645 | struct strbuf buf = STRBUF_INIT; | |
646 | ||
647 | if (!trace_want(&trace_default_key)) | |
648 | return; | |
649 | ||
248f66ed | 650 | strbuf_addstr(&buf, "trace: run_command:"); |
090a0927 NTND |
651 | if (cp->dir) { |
652 | strbuf_addstr(&buf, " cd "); | |
653 | sq_quote_buf_pretty(&buf, cp->dir); | |
654 | strbuf_addch(&buf, ';'); | |
655 | } | |
c61a975d NTND |
656 | /* |
657 | * The caller is responsible for initializing cp->env from | |
658 | * cp->env_array if needed. We only check one place. | |
659 | */ | |
660 | if (cp->env) | |
661 | trace_add_env(&buf, cp->env); | |
21dfc5e0 NTND |
662 | if (cp->git_cmd) |
663 | strbuf_addstr(&buf, " git"); | |
e73dd786 NTND |
664 | sq_quote_argv_pretty(&buf, cp->argv); |
665 | ||
666 | trace_printf("%s", buf.buf); | |
667 | strbuf_release(&buf); | |
668 | } | |
669 | ||
ebcb5d16 | 670 | int start_command(struct child_process *cmd) |
b1bf95bb | 671 | { |
f3b33f1d JS |
672 | int need_in, need_out, need_err; |
673 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 674 | int failed_errno; |
939296c4 | 675 | char *str; |
4919bf03 | 676 | |
c460c0ec | 677 | if (!cmd->argv) |
d70a9eb6 | 678 | cmd->argv = cmd->args.v; |
19a583dc | 679 | if (!cmd->env) |
d70a9eb6 | 680 | cmd->env = cmd->env_array.v; |
c460c0ec | 681 | |
c20181e3 JS |
682 | /* |
683 | * In case of errors we must keep the promise to close FDs | |
684 | * that have been passed in via ->in and ->out. | |
685 | */ | |
686 | ||
e4507ae8 | 687 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 688 | if (need_in) { |
c20181e3 | 689 | if (pipe(fdin) < 0) { |
0ac77ec3 | 690 | failed_errno = errno; |
c20181e3 JS |
691 | if (cmd->out > 0) |
692 | close(cmd->out); | |
939296c4 | 693 | str = "standard input"; |
0ac77ec3 | 694 | goto fail_pipe; |
c20181e3 | 695 | } |
4919bf03 | 696 | cmd->in = fdin[1]; |
4919bf03 SP |
697 | } |
698 | ||
e4507ae8 SP |
699 | need_out = !cmd->no_stdout |
700 | && !cmd->stdout_to_stderr | |
701 | && cmd->out < 0; | |
f4bba25b SP |
702 | if (need_out) { |
703 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 704 | failed_errno = errno; |
f4bba25b SP |
705 | if (need_in) |
706 | close_pair(fdin); | |
c20181e3 JS |
707 | else if (cmd->in) |
708 | close(cmd->in); | |
939296c4 | 709 | str = "standard output"; |
0ac77ec3 | 710 | goto fail_pipe; |
f4bba25b SP |
711 | } |
712 | cmd->out = fdout[0]; | |
f4bba25b SP |
713 | } |
714 | ||
b73a4397 | 715 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
716 | if (need_err) { |
717 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 718 | failed_errno = errno; |
f3b33f1d JS |
719 | if (need_in) |
720 | close_pair(fdin); | |
c20181e3 JS |
721 | else if (cmd->in) |
722 | close(cmd->in); | |
f3b33f1d JS |
723 | if (need_out) |
724 | close_pair(fdout); | |
c20181e3 JS |
725 | else if (cmd->out) |
726 | close(cmd->out); | |
939296c4 | 727 | str = "standard error"; |
0ac77ec3 | 728 | fail_pipe: |
939296c4 SB |
729 | error("cannot create %s pipe for %s: %s", |
730 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 731 | child_process_clear(cmd); |
0ac77ec3 JS |
732 | errno = failed_errno; |
733 | return -1; | |
f3b33f1d JS |
734 | } |
735 | cmd->err = fderr[0]; | |
736 | } | |
737 | ||
ee4512ed | 738 | trace2_child_start(cmd); |
e73dd786 NTND |
739 | trace_run_command(cmd); |
740 | ||
13af8cbd | 741 | fflush(NULL); |
8852f5d7 | 742 | |
380395d0 | 743 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
744 | { |
745 | int notify_pipe[2]; | |
db015a28 | 746 | int null_fd = -1; |
ae25394b | 747 | char **childenv; |
c972bf4c | 748 | struct strvec argv = STRVEC_INIT; |
79319b19 | 749 | struct child_err cerr; |
45afb1ca | 750 | struct atfork_state as; |
3967e25b | 751 | |
321fd823 JK |
752 | if (prepare_cmd(&argv, cmd) < 0) { |
753 | failed_errno = errno; | |
754 | cmd->pid = -1; | |
e5a329a2 JH |
755 | if (!cmd->silent_exec_failure) |
756 | error_errno("cannot run %s", cmd->argv[0]); | |
321fd823 JK |
757 | goto end_of_spawn; |
758 | } | |
759 | ||
2b541bf8 JS |
760 | if (pipe(notify_pipe)) |
761 | notify_pipe[0] = notify_pipe[1] = -1; | |
762 | ||
db015a28 | 763 | if (cmd->no_stdin || cmd->no_stdout || cmd->no_stderr) { |
66e905b7 | 764 | null_fd = xopen("/dev/null", O_RDWR | O_CLOEXEC); |
db015a28 BW |
765 | set_cloexec(null_fd); |
766 | } | |
767 | ||
ae25394b | 768 | childenv = prep_childenv(cmd->env); |
45afb1ca | 769 | atfork_prepare(&as); |
3967e25b | 770 | |
e503cd6e BW |
771 | /* |
772 | * NOTE: In order to prevent deadlocking when using threads special | |
773 | * care should be taken with the function calls made in between the | |
774 | * fork() and exec() calls. No calls should be made to functions which | |
775 | * require acquiring a lock (e.g. malloc) as the lock could have been | |
776 | * held by another thread at the time of forking, causing the lock to | |
777 | * never be released in the child process. This means only | |
778 | * Async-Signal-Safe functions are permitted in the child. | |
779 | */ | |
ebcb5d16 | 780 | cmd->pid = fork(); |
25043d8a | 781 | failed_errno = errno; |
ebcb5d16 | 782 | if (!cmd->pid) { |
45afb1ca | 783 | int sig; |
a5487ddf | 784 | /* |
79319b19 BW |
785 | * Ensure the default die/error/warn routines do not get |
786 | * called, they can take stdio locks and malloc. | |
a5487ddf | 787 | */ |
79319b19 BW |
788 | set_die_routine(child_die_fn); |
789 | set_error_routine(child_error_fn); | |
790 | set_warn_routine(child_warn_fn); | |
a5487ddf | 791 | |
2b541bf8 JS |
792 | close(notify_pipe[0]); |
793 | set_cloexec(notify_pipe[1]); | |
794 | child_notifier = notify_pipe[1]; | |
2b541bf8 | 795 | |
e4507ae8 | 796 | if (cmd->no_stdin) |
53fa6753 | 797 | child_dup2(null_fd, 0); |
e4507ae8 | 798 | else if (need_in) { |
53fa6753 BW |
799 | child_dup2(fdin[0], 0); |
800 | child_close_pair(fdin); | |
4919bf03 | 801 | } else if (cmd->in) { |
53fa6753 BW |
802 | child_dup2(cmd->in, 0); |
803 | child_close(cmd->in); | |
95d3c4f5 | 804 | } |
4919bf03 | 805 | |
ce2cf27a | 806 | if (cmd->no_stderr) |
53fa6753 | 807 | child_dup2(null_fd, 2); |
ce2cf27a | 808 | else if (need_err) { |
53fa6753 BW |
809 | child_dup2(fderr[1], 2); |
810 | child_close_pair(fderr); | |
4f41b611 | 811 | } else if (cmd->err > 1) { |
53fa6753 BW |
812 | child_dup2(cmd->err, 2); |
813 | child_close(cmd->err); | |
ce2cf27a CC |
814 | } |
815 | ||
e4507ae8 | 816 | if (cmd->no_stdout) |
53fa6753 | 817 | child_dup2(null_fd, 1); |
e4507ae8 | 818 | else if (cmd->stdout_to_stderr) |
53fa6753 | 819 | child_dup2(2, 1); |
f4bba25b | 820 | else if (need_out) { |
53fa6753 BW |
821 | child_dup2(fdout[1], 1); |
822 | child_close_pair(fdout); | |
f4bba25b | 823 | } else if (cmd->out > 1) { |
53fa6753 BW |
824 | child_dup2(cmd->out, 1); |
825 | child_close(cmd->out); | |
f4bba25b SP |
826 | } |
827 | ||
1568fea0 | 828 | if (cmd->dir && chdir(cmd->dir)) |
79319b19 | 829 | child_die(CHILD_ERR_CHDIR); |
3967e25b | 830 | |
45afb1ca EW |
831 | /* |
832 | * restore default signal handlers here, in case | |
833 | * we catch a signal right before execve below | |
834 | */ | |
835 | for (sig = 1; sig < NSIG; sig++) { | |
836 | /* ignored signals get reset to SIG_DFL on execve */ | |
837 | if (signal(sig, SIG_DFL) == SIG_IGN) | |
838 | signal(sig, SIG_IGN); | |
839 | } | |
840 | ||
841 | if (sigprocmask(SIG_SETMASK, &as.old, NULL) != 0) | |
842 | child_die(CHILD_ERR_SIGPROCMASK); | |
843 | ||
e3a43446 BW |
844 | /* |
845 | * Attempt to exec using the command and arguments starting at | |
846 | * argv.argv[1]. argv.argv[0] contains SHELL_PATH which will | |
847 | * be used in the event exec failed with ENOEXEC at which point | |
848 | * we will try to interpret the command using 'sh'. | |
849 | */ | |
d70a9eb6 | 850 | execve(argv.v[1], (char *const *) argv.v + 1, |
ae25394b | 851 | (char *const *) childenv); |
e3a43446 | 852 | if (errno == ENOEXEC) |
d70a9eb6 | 853 | execve(argv.v[0], (char *const *) argv.v, |
ae25394b | 854 | (char *const *) childenv); |
3967e25b | 855 | |
fc1b56f0 | 856 | if (errno == ENOENT) { |
79319b19 BW |
857 | if (cmd->silent_exec_failure) |
858 | child_die(CHILD_ERR_SILENT); | |
859 | child_die(CHILD_ERR_ENOENT); | |
fc1b56f0 | 860 | } else { |
79319b19 | 861 | child_die(CHILD_ERR_ERRNO); |
fc1b56f0 | 862 | } |
b1bf95bb | 863 | } |
45afb1ca | 864 | atfork_parent(&as); |
0ac77ec3 | 865 | if (cmd->pid < 0) |
fbcb0e06 | 866 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 | 867 | else if (cmd->clean_on_exit) |
ac2fbaa6 | 868 | mark_child_for_cleanup(cmd->pid, cmd); |
2b541bf8 JS |
869 | |
870 | /* | |
3967e25b | 871 | * Wait for child's exec. If the exec succeeds (or if fork() |
2b541bf8 | 872 | * failed), EOF is seen immediately by the parent. Otherwise, the |
79319b19 | 873 | * child process sends a child_err struct. |
2b541bf8 JS |
874 | * Note that use of this infrastructure is completely advisory, |
875 | * therefore, we keep error checks minimal. | |
876 | */ | |
877 | close(notify_pipe[1]); | |
79319b19 | 878 | if (xread(notify_pipe[0], &cerr, sizeof(cerr)) == sizeof(cerr)) { |
2b541bf8 | 879 | /* |
3967e25b | 880 | * At this point we know that fork() succeeded, but exec() |
2b541bf8 JS |
881 | * failed. Errors have been reported to our stderr. |
882 | */ | |
507d7804 | 883 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
79319b19 | 884 | child_err_spew(cmd, &cerr); |
2b541bf8 JS |
885 | failed_errno = errno; |
886 | cmd->pid = -1; | |
887 | } | |
888 | close(notify_pipe[0]); | |
3967e25b | 889 | |
db015a28 BW |
890 | if (null_fd >= 0) |
891 | close(null_fd); | |
c972bf4c | 892 | strvec_clear(&argv); |
ae25394b | 893 | free(childenv); |
2b541bf8 | 894 | } |
321fd823 JK |
895 | end_of_spawn: |
896 | ||
ba26f296 | 897 | #else |
0d30ad71 | 898 | { |
75301f90 | 899 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 900 | const char **sargv = cmd->argv; |
c972bf4c | 901 | struct strvec nargv = STRVEC_INIT; |
ba26f296 | 902 | |
75301f90 JS |
903 | if (cmd->no_stdin) |
904 | fhin = open("/dev/null", O_RDWR); | |
905 | else if (need_in) | |
906 | fhin = dup(fdin[0]); | |
907 | else if (cmd->in) | |
908 | fhin = dup(cmd->in); | |
909 | ||
910 | if (cmd->no_stderr) | |
911 | fherr = open("/dev/null", O_RDWR); | |
912 | else if (need_err) | |
913 | fherr = dup(fderr[1]); | |
76d44c8c JH |
914 | else if (cmd->err > 2) |
915 | fherr = dup(cmd->err); | |
75301f90 JS |
916 | |
917 | if (cmd->no_stdout) | |
918 | fhout = open("/dev/null", O_RDWR); | |
919 | else if (cmd->stdout_to_stderr) | |
920 | fhout = dup(fherr); | |
921 | else if (need_out) | |
922 | fhout = dup(fdout[1]); | |
923 | else if (cmd->out > 1) | |
924 | fhout = dup(cmd->out); | |
ba26f296 | 925 | |
5a50085c | 926 | if (cmd->git_cmd) |
20574f55 | 927 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 928 | else if (cmd->use_shell) |
20574f55 | 929 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 930 | |
77734da2 KB |
931 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
932 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 933 | failed_errno = errno; |
c024beb5 | 934 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 935 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 | 936 | if (cmd->clean_on_exit && cmd->pid >= 0) |
ac2fbaa6 | 937 | mark_child_for_cleanup(cmd->pid, cmd); |
ba26f296 | 938 | |
c972bf4c | 939 | strvec_clear(&nargv); |
108ac313 | 940 | cmd->argv = sargv; |
75301f90 JS |
941 | if (fhin != 0) |
942 | close(fhin); | |
943 | if (fhout != 1) | |
944 | close(fhout); | |
945 | if (fherr != 2) | |
946 | close(fherr); | |
0d30ad71 | 947 | } |
ba26f296 JS |
948 | #endif |
949 | ||
950 | if (cmd->pid < 0) { | |
ee4512ed JH |
951 | trace2_child_exit(cmd, -1); |
952 | ||
ba26f296 JS |
953 | if (need_in) |
954 | close_pair(fdin); | |
955 | else if (cmd->in) | |
956 | close(cmd->in); | |
957 | if (need_out) | |
958 | close_pair(fdout); | |
959 | else if (cmd->out) | |
960 | close(cmd->out); | |
961 | if (need_err) | |
962 | close_pair(fderr); | |
fc012c28 D |
963 | else if (cmd->err) |
964 | close(cmd->err); | |
2d71608e | 965 | child_process_clear(cmd); |
0ac77ec3 JS |
966 | errno = failed_errno; |
967 | return -1; | |
ba26f296 | 968 | } |
4919bf03 SP |
969 | |
970 | if (need_in) | |
971 | close(fdin[0]); | |
972 | else if (cmd->in) | |
973 | close(cmd->in); | |
974 | ||
f4bba25b SP |
975 | if (need_out) |
976 | close(fdout[1]); | |
c20181e3 | 977 | else if (cmd->out) |
f4bba25b SP |
978 | close(cmd->out); |
979 | ||
f3b33f1d JS |
980 | if (need_err) |
981 | close(fderr[1]); | |
4f41b611 SP |
982 | else if (cmd->err) |
983 | close(cmd->err); | |
f3b33f1d | 984 | |
ebcb5d16 SP |
985 | return 0; |
986 | } | |
987 | ||
2d22c208 JS |
988 | int finish_command(struct child_process *cmd) |
989 | { | |
507d7804 | 990 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
ee4512ed | 991 | trace2_child_exit(cmd, ret); |
2d71608e | 992 | child_process_clear(cmd); |
0d58fef5 | 993 | invalidate_lstat_cache(); |
c460c0ec | 994 | return ret; |
2d22c208 JS |
995 | } |
996 | ||
507d7804 TI |
997 | int finish_command_in_signal(struct child_process *cmd) |
998 | { | |
ee4512ed JH |
999 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 1); |
1000 | trace2_child_exit(cmd, ret); | |
1001 | return ret; | |
507d7804 TI |
1002 | } |
1003 | ||
1004 | ||
ebcb5d16 SP |
1005 | int run_command(struct child_process *cmd) |
1006 | { | |
c29b3962 JK |
1007 | int code; |
1008 | ||
1009 | if (cmd->out < 0 || cmd->err < 0) | |
033abf97 | 1010 | BUG("run_command with a pipe can cause deadlock"); |
c29b3962 JK |
1011 | |
1012 | code = start_command(cmd); | |
ebcb5d16 SP |
1013 | if (code) |
1014 | return code; | |
1015 | return finish_command(cmd); | |
1016 | } | |
1017 | ||
f1000898 SP |
1018 | int run_command_v_opt(const char **argv, int opt) |
1019 | { | |
41e9bad7 | 1020 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
1021 | } |
1022 | ||
ee4512ed JH |
1023 | int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class) |
1024 | { | |
1025 | return run_command_v_opt_cd_env_tr2(argv, opt, NULL, NULL, tr2_class); | |
1026 | } | |
1027 | ||
ee493148 | 1028 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
ee4512ed JH |
1029 | { |
1030 | return run_command_v_opt_cd_env_tr2(argv, opt, dir, env, NULL); | |
1031 | } | |
1032 | ||
1033 | int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir, | |
1034 | const char *const *env, const char *tr2_class) | |
ee493148 | 1035 | { |
1f87293d RS |
1036 | struct child_process cmd = CHILD_PROCESS_INIT; |
1037 | cmd.argv = argv; | |
1038 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
1039 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
1040 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
1041 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
1042 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
1043 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
e662df7e | 1044 | cmd.wait_after_clean = opt & RUN_WAIT_AFTER_CLEAN ? 1 : 0; |
ee493148 AR |
1045 | cmd.dir = dir; |
1046 | cmd.env = env; | |
ee4512ed | 1047 | cmd.trace2_child_class = tr2_class; |
ee493148 AR |
1048 | return run_command(&cmd); |
1049 | } | |
2d22c208 | 1050 | |
f6b60983 | 1051 | #ifndef NO_PTHREADS |
0ea1c89b JS |
1052 | static pthread_t main_thread; |
1053 | static int main_thread_set; | |
1054 | static pthread_key_t async_key; | |
1ece66bc | 1055 | static pthread_key_t async_die_counter; |
0ea1c89b | 1056 | |
200a76b7 | 1057 | static void *run_thread(void *data) |
618ebe9f JS |
1058 | { |
1059 | struct async *async = data; | |
f6b60983 | 1060 | intptr_t ret; |
0ea1c89b | 1061 | |
c792d7b6 JK |
1062 | if (async->isolate_sigpipe) { |
1063 | sigset_t mask; | |
1064 | sigemptyset(&mask); | |
1065 | sigaddset(&mask, SIGPIPE); | |
1066 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
1067 | ret = error("unable to block SIGPIPE in async thread"); | |
1068 | return (void *)ret; | |
1069 | } | |
1070 | } | |
1071 | ||
0ea1c89b | 1072 | pthread_setspecific(async_key, async); |
f6b60983 | 1073 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 1074 | return (void *)ret; |
618ebe9f | 1075 | } |
0ea1c89b JS |
1076 | |
1077 | static NORETURN void die_async(const char *err, va_list params) | |
1078 | { | |
1079 | vreportf("fatal: ", err, params); | |
1080 | ||
661a8cf4 | 1081 | if (in_async()) { |
0ea1c89b JS |
1082 | struct async *async = pthread_getspecific(async_key); |
1083 | if (async->proc_in >= 0) | |
1084 | close(async->proc_in); | |
1085 | if (async->proc_out >= 0) | |
1086 | close(async->proc_out); | |
1087 | pthread_exit((void *)128); | |
1088 | } | |
1089 | ||
1090 | exit(128); | |
618ebe9f | 1091 | } |
1ece66bc JK |
1092 | |
1093 | static int async_die_is_recursing(void) | |
1094 | { | |
1095 | void *ret = pthread_getspecific(async_die_counter); | |
4b540cf9 | 1096 | pthread_setspecific(async_die_counter, &async_die_counter); /* set to any non-NULL valid pointer */ |
1ece66bc JK |
1097 | return ret != NULL; |
1098 | } | |
1099 | ||
661a8cf4 JK |
1100 | int in_async(void) |
1101 | { | |
1102 | if (!main_thread_set) | |
1103 | return 0; /* no asyncs started yet */ | |
1104 | return !pthread_equal(main_thread, pthread_self()); | |
1105 | } | |
1106 | ||
b992fe10 | 1107 | static void NORETURN async_exit(int code) |
9658846c JK |
1108 | { |
1109 | pthread_exit((void *)(intptr_t)code); | |
1110 | } | |
1111 | ||
0f4b6db3 EB |
1112 | #else |
1113 | ||
1114 | static struct { | |
1115 | void (**handlers)(void); | |
1116 | size_t nr; | |
1117 | size_t alloc; | |
1118 | } git_atexit_hdlrs; | |
1119 | ||
1120 | static int git_atexit_installed; | |
1121 | ||
6066a7ea | 1122 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
1123 | { |
1124 | size_t i; | |
1125 | ||
1126 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
1127 | git_atexit_hdlrs.handlers[i-1](); | |
1128 | } | |
1129 | ||
6066a7ea | 1130 | static void git_atexit_clear(void) |
0f4b6db3 EB |
1131 | { |
1132 | free(git_atexit_hdlrs.handlers); | |
1133 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
1134 | git_atexit_installed = 0; | |
1135 | } | |
1136 | ||
1137 | #undef atexit | |
1138 | int git_atexit(void (*handler)(void)) | |
1139 | { | |
1140 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
1141 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
1142 | if (!git_atexit_installed) { | |
1143 | if (atexit(&git_atexit_dispatch)) | |
1144 | return -1; | |
1145 | git_atexit_installed = 1; | |
1146 | } | |
1147 | return 0; | |
1148 | } | |
1149 | #define atexit git_atexit | |
1150 | ||
661a8cf4 JK |
1151 | static int process_is_async; |
1152 | int in_async(void) | |
1153 | { | |
1154 | return process_is_async; | |
1155 | } | |
1156 | ||
b992fe10 | 1157 | static void NORETURN async_exit(int code) |
9658846c JK |
1158 | { |
1159 | exit(code); | |
1160 | } | |
1161 | ||
618ebe9f JS |
1162 | #endif |
1163 | ||
b992fe10 LS |
1164 | void check_pipe(int err) |
1165 | { | |
1166 | if (err == EPIPE) { | |
1167 | if (in_async()) | |
1168 | async_exit(141); | |
1169 | ||
1170 | signal(SIGPIPE, SIG_DFL); | |
1171 | raise(SIGPIPE); | |
1172 | /* Should never happen, but just in case... */ | |
1173 | exit(141); | |
1174 | } | |
1175 | } | |
1176 | ||
2d22c208 JS |
1177 | int start_async(struct async *async) |
1178 | { | |
ae6a5609 EFL |
1179 | int need_in, need_out; |
1180 | int fdin[2], fdout[2]; | |
1181 | int proc_in, proc_out; | |
2d22c208 | 1182 | |
ae6a5609 EFL |
1183 | need_in = async->in < 0; |
1184 | if (need_in) { | |
1185 | if (pipe(fdin) < 0) { | |
1186 | if (async->out > 0) | |
1187 | close(async->out); | |
fbcb0e06 | 1188 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1189 | } |
1190 | async->in = fdin[1]; | |
1191 | } | |
1192 | ||
1193 | need_out = async->out < 0; | |
1194 | if (need_out) { | |
1195 | if (pipe(fdout) < 0) { | |
1196 | if (need_in) | |
1197 | close_pair(fdin); | |
1198 | else if (async->in) | |
1199 | close(async->in); | |
fbcb0e06 | 1200 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1201 | } |
1202 | async->out = fdout[0]; | |
1203 | } | |
1204 | ||
1205 | if (need_in) | |
1206 | proc_in = fdin[0]; | |
1207 | else if (async->in) | |
1208 | proc_in = async->in; | |
1209 | else | |
1210 | proc_in = -1; | |
1211 | ||
1212 | if (need_out) | |
1213 | proc_out = fdout[1]; | |
1214 | else if (async->out) | |
1215 | proc_out = async->out; | |
1216 | else | |
1217 | proc_out = -1; | |
2d22c208 | 1218 | |
f6b60983 | 1219 | #ifdef NO_PTHREADS |
2c3766f0 AM |
1220 | /* Flush stdio before fork() to avoid cloning buffers */ |
1221 | fflush(NULL); | |
1222 | ||
2d22c208 JS |
1223 | async->pid = fork(); |
1224 | if (async->pid < 0) { | |
fbcb0e06 | 1225 | error_errno("fork (async) failed"); |
ae6a5609 | 1226 | goto error; |
2d22c208 JS |
1227 | } |
1228 | if (!async->pid) { | |
ae6a5609 EFL |
1229 | if (need_in) |
1230 | close(fdin[1]); | |
1231 | if (need_out) | |
1232 | close(fdout[0]); | |
0f4b6db3 | 1233 | git_atexit_clear(); |
661a8cf4 | 1234 | process_is_async = 1; |
ae6a5609 | 1235 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 1236 | } |
ae6a5609 | 1237 | |
ac2fbaa6 | 1238 | mark_child_for_cleanup(async->pid, NULL); |
afe19ff7 | 1239 | |
ae6a5609 EFL |
1240 | if (need_in) |
1241 | close(fdin[0]); | |
1242 | else if (async->in) | |
1243 | close(async->in); | |
1244 | ||
1245 | if (need_out) | |
1246 | close(fdout[1]); | |
1247 | else if (async->out) | |
1248 | close(async->out); | |
618ebe9f | 1249 | #else |
0ea1c89b JS |
1250 | if (!main_thread_set) { |
1251 | /* | |
1252 | * We assume that the first time that start_async is called | |
1253 | * it is from the main thread. | |
1254 | */ | |
1255 | main_thread_set = 1; | |
1256 | main_thread = pthread_self(); | |
1257 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 1258 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 1259 | set_die_routine(die_async); |
1ece66bc | 1260 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
1261 | } |
1262 | ||
200a76b7 JS |
1263 | if (proc_in >= 0) |
1264 | set_cloexec(proc_in); | |
1265 | if (proc_out >= 0) | |
1266 | set_cloexec(proc_out); | |
ae6a5609 EFL |
1267 | async->proc_in = proc_in; |
1268 | async->proc_out = proc_out; | |
200a76b7 JS |
1269 | { |
1270 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
1271 | if (err) { | |
2179045f | 1272 | error(_("cannot create async thread: %s"), strerror(err)); |
200a76b7 JS |
1273 | goto error; |
1274 | } | |
618ebe9f JS |
1275 | } |
1276 | #endif | |
2d22c208 | 1277 | return 0; |
ae6a5609 EFL |
1278 | |
1279 | error: | |
1280 | if (need_in) | |
1281 | close_pair(fdin); | |
1282 | else if (async->in) | |
1283 | close(async->in); | |
1284 | ||
1285 | if (need_out) | |
1286 | close_pair(fdout); | |
1287 | else if (async->out) | |
1288 | close(async->out); | |
1289 | return -1; | |
2d22c208 JS |
1290 | } |
1291 | ||
1292 | int finish_async(struct async *async) | |
1293 | { | |
f6b60983 | 1294 | #ifdef NO_PTHREADS |
0d58fef5 JS |
1295 | int ret = wait_or_whine(async->pid, "child process", 0); |
1296 | ||
1297 | invalidate_lstat_cache(); | |
1298 | ||
1299 | return ret; | |
618ebe9f | 1300 | #else |
200a76b7 JS |
1301 | void *ret = (void *)(intptr_t)(-1); |
1302 | ||
1303 | if (pthread_join(async->tid, &ret)) | |
1304 | error("pthread_join failed"); | |
0d58fef5 | 1305 | invalidate_lstat_cache(); |
200a76b7 | 1306 | return (int)(intptr_t)ret; |
0d58fef5 | 1307 | |
618ebe9f | 1308 | #endif |
2d22c208 | 1309 | } |
ae98a008 | 1310 | |
c0e40a2d NTND |
1311 | int async_with_fork(void) |
1312 | { | |
1313 | #ifdef NO_PTHREADS | |
1314 | return 1; | |
1315 | #else | |
1316 | return 0; | |
1317 | #endif | |
1318 | } | |
1319 | ||
dcf69262 | 1320 | const char *find_hook(const char *name) |
5a7da2dc | 1321 | { |
03f2c773 | 1322 | static struct strbuf path = STRBUF_INIT; |
5a7da2dc | 1323 | |
03f2c773 | 1324 | strbuf_reset(&path); |
9445b492 | 1325 | strbuf_git_path(&path, "hooks/%s", name); |
235be51f | 1326 | if (access(path.buf, X_OK) < 0) { |
f805a00a DM |
1327 | int err = errno; |
1328 | ||
235be51f JS |
1329 | #ifdef STRIP_EXTENSION |
1330 | strbuf_addstr(&path, STRIP_EXTENSION); | |
1331 | if (access(path.buf, X_OK) >= 0) | |
1332 | return path.buf; | |
f805a00a DM |
1333 | if (errno == EACCES) |
1334 | err = errno; | |
235be51f | 1335 | #endif |
f805a00a DM |
1336 | |
1337 | if (err == EACCES && advice_ignored_hook) { | |
1338 | static struct string_list advise_given = STRING_LIST_INIT_DUP; | |
1339 | ||
1340 | if (!string_list_lookup(&advise_given, name)) { | |
1341 | string_list_insert(&advise_given, name); | |
1342 | advise(_("The '%s' hook was ignored because " | |
1343 | "it's not set as executable.\n" | |
1344 | "You can disable this warning with " | |
1345 | "`git config advice.ignoredHook false`."), | |
1346 | path.buf); | |
1347 | } | |
1348 | } | |
03f2c773 | 1349 | return NULL; |
235be51f | 1350 | } |
03f2c773 | 1351 | return path.buf; |
5a7da2dc AS |
1352 | } |
1353 | ||
15048f8a | 1354 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 1355 | { |
d3180279 | 1356 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 1357 | const char *p; |
ae98a008 | 1358 | |
5a7da2dc AS |
1359 | p = find_hook(name); |
1360 | if (!p) | |
cf94ca8e SB |
1361 | return 0; |
1362 | ||
c972bf4c | 1363 | strvec_push(&hook.args, p); |
d1d09456 | 1364 | while ((p = va_arg(args, const char *))) |
c972bf4c | 1365 | strvec_push(&hook.args, p); |
15048f8a | 1366 | hook.env = env; |
ae98a008 SB |
1367 | hook.no_stdin = 1; |
1368 | hook.stdout_to_stderr = 1; | |
ee4512ed | 1369 | hook.trace2_hook_name = name; |
ae98a008 | 1370 | |
d1d09456 | 1371 | return run_command(&hook); |
ae98a008 | 1372 | } |
15048f8a BP |
1373 | |
1374 | int run_hook_le(const char *const *env, const char *name, ...) | |
1375 | { | |
1376 | va_list args; | |
1377 | int ret; | |
1378 | ||
1379 | va_start(args, name); | |
1380 | ret = run_hook_ve(env, name, args); | |
1381 | va_end(args); | |
1382 | ||
1383 | return ret; | |
1384 | } | |
911ec99b | 1385 | |
96335bcf JK |
1386 | struct io_pump { |
1387 | /* initialized by caller */ | |
1388 | int fd; | |
1389 | int type; /* POLLOUT or POLLIN */ | |
1390 | union { | |
1391 | struct { | |
1392 | const char *buf; | |
1393 | size_t len; | |
1394 | } out; | |
1395 | struct { | |
1396 | struct strbuf *buf; | |
1397 | size_t hint; | |
1398 | } in; | |
1399 | } u; | |
1400 | ||
1401 | /* returned by pump_io */ | |
1402 | int error; /* 0 for success, otherwise errno */ | |
1403 | ||
1404 | /* internal use */ | |
1405 | struct pollfd *pfd; | |
1406 | }; | |
1407 | ||
1408 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
1409 | { | |
1410 | int pollsize = 0; | |
1411 | int i; | |
1412 | ||
1413 | for (i = 0; i < nr; i++) { | |
1414 | struct io_pump *io = &slots[i]; | |
1415 | if (io->fd < 0) | |
1416 | continue; | |
1417 | pfd[pollsize].fd = io->fd; | |
1418 | pfd[pollsize].events = io->type; | |
1419 | io->pfd = &pfd[pollsize++]; | |
1420 | } | |
1421 | ||
1422 | if (!pollsize) | |
1423 | return 0; | |
1424 | ||
1425 | if (poll(pfd, pollsize, -1) < 0) { | |
1426 | if (errno == EINTR) | |
1427 | return 1; | |
1428 | die_errno("poll failed"); | |
1429 | } | |
1430 | ||
1431 | for (i = 0; i < nr; i++) { | |
1432 | struct io_pump *io = &slots[i]; | |
1433 | ||
1434 | if (io->fd < 0) | |
1435 | continue; | |
1436 | ||
1437 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
1438 | continue; | |
1439 | ||
1440 | if (io->type == POLLOUT) { | |
1441 | ssize_t len = xwrite(io->fd, | |
1442 | io->u.out.buf, io->u.out.len); | |
1443 | if (len < 0) { | |
1444 | io->error = errno; | |
1445 | close(io->fd); | |
1446 | io->fd = -1; | |
1447 | } else { | |
1448 | io->u.out.buf += len; | |
1449 | io->u.out.len -= len; | |
1450 | if (!io->u.out.len) { | |
1451 | close(io->fd); | |
1452 | io->fd = -1; | |
1453 | } | |
1454 | } | |
1455 | } | |
1456 | ||
1457 | if (io->type == POLLIN) { | |
1458 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
1459 | io->fd, io->u.in.hint); | |
1460 | if (len < 0) | |
1461 | io->error = errno; | |
1462 | if (len <= 0) { | |
1463 | close(io->fd); | |
1464 | io->fd = -1; | |
1465 | } | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | return 1; | |
1470 | } | |
1471 | ||
1472 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 1473 | { |
96335bcf JK |
1474 | struct pollfd *pfd; |
1475 | int i; | |
1476 | ||
1477 | for (i = 0; i < nr; i++) | |
1478 | slots[i].error = 0; | |
1479 | ||
1480 | ALLOC_ARRAY(pfd, nr); | |
1481 | while (pump_io_round(slots, nr, pfd)) | |
1482 | ; /* nothing */ | |
1483 | free(pfd); | |
1484 | ||
1485 | /* There may be multiple errno values, so just pick the first. */ | |
1486 | for (i = 0; i < nr; i++) { | |
1487 | if (slots[i].error) { | |
1488 | errno = slots[i].error; | |
1489 | return -1; | |
1490 | } | |
1491 | } | |
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | ||
1496 | int pipe_command(struct child_process *cmd, | |
1497 | const char *in, size_t in_len, | |
1498 | struct strbuf *out, size_t out_hint, | |
1499 | struct strbuf *err, size_t err_hint) | |
1500 | { | |
1501 | struct io_pump io[3]; | |
1502 | int nr = 0; | |
1503 | ||
1504 | if (in) | |
1505 | cmd->in = -1; | |
1506 | if (out) | |
1507 | cmd->out = -1; | |
1508 | if (err) | |
1509 | cmd->err = -1; | |
1510 | ||
911ec99b JK |
1511 | if (start_command(cmd) < 0) |
1512 | return -1; | |
1513 | ||
96335bcf JK |
1514 | if (in) { |
1515 | io[nr].fd = cmd->in; | |
1516 | io[nr].type = POLLOUT; | |
1517 | io[nr].u.out.buf = in; | |
1518 | io[nr].u.out.len = in_len; | |
1519 | nr++; | |
1520 | } | |
1521 | if (out) { | |
1522 | io[nr].fd = cmd->out; | |
1523 | io[nr].type = POLLIN; | |
1524 | io[nr].u.in.buf = out; | |
1525 | io[nr].u.in.hint = out_hint; | |
1526 | nr++; | |
1527 | } | |
1528 | if (err) { | |
1529 | io[nr].fd = cmd->err; | |
1530 | io[nr].type = POLLIN; | |
1531 | io[nr].u.in.buf = err; | |
1532 | io[nr].u.in.hint = err_hint; | |
1533 | nr++; | |
1534 | } | |
1535 | ||
1536 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1537 | finish_command(cmd); /* throw away exit code */ |
1538 | return -1; | |
1539 | } | |
1540 | ||
911ec99b JK |
1541 | return finish_command(cmd); |
1542 | } | |
c553c72e SB |
1543 | |
1544 | enum child_state { | |
1545 | GIT_CP_FREE, | |
1546 | GIT_CP_WORKING, | |
1547 | GIT_CP_WAIT_CLEANUP, | |
1548 | }; | |
1549 | ||
1550 | struct parallel_processes { | |
1551 | void *data; | |
1552 | ||
1553 | int max_processes; | |
1554 | int nr_processes; | |
1555 | ||
1556 | get_next_task_fn get_next_task; | |
1557 | start_failure_fn start_failure; | |
1558 | task_finished_fn task_finished; | |
1559 | ||
1560 | struct { | |
1561 | enum child_state state; | |
1562 | struct child_process process; | |
1563 | struct strbuf err; | |
1564 | void *data; | |
1565 | } *children; | |
1566 | /* | |
1567 | * The struct pollfd is logically part of *children, | |
1568 | * but the system call expects it as its own array. | |
1569 | */ | |
1570 | struct pollfd *pfd; | |
1571 | ||
1572 | unsigned shutdown : 1; | |
1573 | ||
1574 | int output_owner; | |
1575 | struct strbuf buffered_output; /* of finished children */ | |
1576 | }; | |
1577 | ||
aa710494 | 1578 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1579 | void *pp_cb, |
1580 | void *pp_task_cb) | |
1581 | { | |
c553c72e SB |
1582 | return 0; |
1583 | } | |
1584 | ||
1585 | static int default_task_finished(int result, | |
aa710494 | 1586 | struct strbuf *out, |
c553c72e SB |
1587 | void *pp_cb, |
1588 | void *pp_task_cb) | |
1589 | { | |
c553c72e SB |
1590 | return 0; |
1591 | } | |
1592 | ||
1593 | static void kill_children(struct parallel_processes *pp, int signo) | |
1594 | { | |
1595 | int i, n = pp->max_processes; | |
1596 | ||
1597 | for (i = 0; i < n; i++) | |
1598 | if (pp->children[i].state == GIT_CP_WORKING) | |
1599 | kill(pp->children[i].process.pid, signo); | |
1600 | } | |
1601 | ||
1602 | static struct parallel_processes *pp_for_signal; | |
1603 | ||
1604 | static void handle_children_on_signal(int signo) | |
1605 | { | |
1606 | kill_children(pp_for_signal, signo); | |
1607 | sigchain_pop(signo); | |
1608 | raise(signo); | |
1609 | } | |
1610 | ||
1611 | static void pp_init(struct parallel_processes *pp, | |
1612 | int n, | |
1613 | get_next_task_fn get_next_task, | |
1614 | start_failure_fn start_failure, | |
1615 | task_finished_fn task_finished, | |
1616 | void *data) | |
1617 | { | |
1618 | int i; | |
1619 | ||
1620 | if (n < 1) | |
1621 | n = online_cpus(); | |
1622 | ||
1623 | pp->max_processes = n; | |
1624 | ||
1625 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1626 | ||
1627 | pp->data = data; | |
1628 | if (!get_next_task) | |
033abf97 | 1629 | BUG("you need to specify a get_next_task function"); |
c553c72e SB |
1630 | pp->get_next_task = get_next_task; |
1631 | ||
1632 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1633 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1634 | ||
1635 | pp->nr_processes = 0; | |
1636 | pp->output_owner = 0; | |
1637 | pp->shutdown = 0; | |
ca56dadb RS |
1638 | CALLOC_ARRAY(pp->children, n); |
1639 | CALLOC_ARRAY(pp->pfd, n); | |
c553c72e SB |
1640 | strbuf_init(&pp->buffered_output, 0); |
1641 | ||
1642 | for (i = 0; i < n; i++) { | |
1643 | strbuf_init(&pp->children[i].err, 0); | |
1644 | child_process_init(&pp->children[i].process); | |
1645 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1646 | pp->pfd[i].fd = -1; | |
1647 | } | |
1648 | ||
1649 | pp_for_signal = pp; | |
1650 | sigchain_push_common(handle_children_on_signal); | |
1651 | } | |
1652 | ||
1653 | static void pp_cleanup(struct parallel_processes *pp) | |
1654 | { | |
1655 | int i; | |
1656 | ||
1657 | trace_printf("run_processes_parallel: done"); | |
1658 | for (i = 0; i < pp->max_processes; i++) { | |
1659 | strbuf_release(&pp->children[i].err); | |
1660 | child_process_clear(&pp->children[i].process); | |
1661 | } | |
1662 | ||
1663 | free(pp->children); | |
1664 | free(pp->pfd); | |
1665 | ||
1666 | /* | |
1667 | * When get_next_task added messages to the buffer in its last | |
1668 | * iteration, the buffered output is non empty. | |
1669 | */ | |
2dac9b56 | 1670 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1671 | strbuf_release(&pp->buffered_output); |
1672 | ||
1673 | sigchain_pop_common(); | |
1674 | } | |
1675 | ||
1676 | /* returns | |
1677 | * 0 if a new task was started. | |
1678 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1679 | * problem with starting a new command) | |
1680 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1681 | * to signal the children. | |
1682 | */ | |
1683 | static int pp_start_one(struct parallel_processes *pp) | |
1684 | { | |
1685 | int i, code; | |
1686 | ||
1687 | for (i = 0; i < pp->max_processes; i++) | |
1688 | if (pp->children[i].state == GIT_CP_FREE) | |
1689 | break; | |
1690 | if (i == pp->max_processes) | |
033abf97 | 1691 | BUG("bookkeeping is hard"); |
c553c72e SB |
1692 | |
1693 | code = pp->get_next_task(&pp->children[i].process, | |
1694 | &pp->children[i].err, | |
1695 | pp->data, | |
1696 | &pp->children[i].data); | |
1697 | if (!code) { | |
1698 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1699 | strbuf_reset(&pp->children[i].err); | |
1700 | return 1; | |
1701 | } | |
1702 | pp->children[i].process.err = -1; | |
1703 | pp->children[i].process.stdout_to_stderr = 1; | |
1704 | pp->children[i].process.no_stdin = 1; | |
1705 | ||
1706 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1707 | code = pp->start_failure(&pp->children[i].err, |
c553c72e | 1708 | pp->data, |
c1e860f1 | 1709 | pp->children[i].data); |
c553c72e SB |
1710 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); |
1711 | strbuf_reset(&pp->children[i].err); | |
1712 | if (code) | |
1713 | pp->shutdown = 1; | |
1714 | return code; | |
1715 | } | |
1716 | ||
1717 | pp->nr_processes++; | |
1718 | pp->children[i].state = GIT_CP_WORKING; | |
1719 | pp->pfd[i].fd = pp->children[i].process.err; | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1724 | { | |
1725 | int i; | |
1726 | ||
1727 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1728 | if (errno == EINTR) | |
1729 | continue; | |
1730 | pp_cleanup(pp); | |
1731 | die_errno("poll"); | |
1732 | } | |
1733 | ||
1734 | /* Buffer output from all pipes. */ | |
1735 | for (i = 0; i < pp->max_processes; i++) { | |
1736 | if (pp->children[i].state == GIT_CP_WORKING && | |
1737 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1738 | int n = strbuf_read_once(&pp->children[i].err, | |
1739 | pp->children[i].process.err, 0); | |
1740 | if (n == 0) { | |
1741 | close(pp->children[i].process.err); | |
1742 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1743 | } else if (n < 0) | |
1744 | if (errno != EAGAIN) | |
1745 | die_errno("read"); | |
1746 | } | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | static void pp_output(struct parallel_processes *pp) | |
1751 | { | |
1752 | int i = pp->output_owner; | |
1753 | if (pp->children[i].state == GIT_CP_WORKING && | |
1754 | pp->children[i].err.len) { | |
2dac9b56 | 1755 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1756 | strbuf_reset(&pp->children[i].err); |
1757 | } | |
1758 | } | |
1759 | ||
1760 | static int pp_collect_finished(struct parallel_processes *pp) | |
1761 | { | |
1762 | int i, code; | |
1763 | int n = pp->max_processes; | |
1764 | int result = 0; | |
1765 | ||
1766 | while (pp->nr_processes > 0) { | |
1767 | for (i = 0; i < pp->max_processes; i++) | |
1768 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1769 | break; | |
1770 | if (i == pp->max_processes) | |
1771 | break; | |
1772 | ||
1773 | code = finish_command(&pp->children[i].process); | |
1774 | ||
2a73b3da | 1775 | code = pp->task_finished(code, |
c553c72e | 1776 | &pp->children[i].err, pp->data, |
c1e860f1 | 1777 | pp->children[i].data); |
c553c72e SB |
1778 | |
1779 | if (code) | |
1780 | result = code; | |
1781 | if (code < 0) | |
1782 | break; | |
1783 | ||
1784 | pp->nr_processes--; | |
1785 | pp->children[i].state = GIT_CP_FREE; | |
1786 | pp->pfd[i].fd = -1; | |
1787 | child_process_init(&pp->children[i].process); | |
1788 | ||
1789 | if (i != pp->output_owner) { | |
1790 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1791 | strbuf_reset(&pp->children[i].err); | |
1792 | } else { | |
2dac9b56 | 1793 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1794 | strbuf_reset(&pp->children[i].err); |
1795 | ||
1796 | /* Output all other finished child processes */ | |
2dac9b56 | 1797 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1798 | strbuf_reset(&pp->buffered_output); |
1799 | ||
1800 | /* | |
1801 | * Pick next process to output live. | |
1802 | * NEEDSWORK: | |
1803 | * For now we pick it randomly by doing a round | |
1804 | * robin. Later we may want to pick the one with | |
1805 | * the most output or the longest or shortest | |
1806 | * running process time. | |
1807 | */ | |
1808 | for (i = 0; i < n; i++) | |
1809 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1810 | break; | |
1811 | pp->output_owner = (pp->output_owner + i) % n; | |
1812 | } | |
1813 | } | |
1814 | return result; | |
1815 | } | |
1816 | ||
1817 | int run_processes_parallel(int n, | |
1818 | get_next_task_fn get_next_task, | |
1819 | start_failure_fn start_failure, | |
1820 | task_finished_fn task_finished, | |
1821 | void *pp_cb) | |
1822 | { | |
1823 | int i, code; | |
1824 | int output_timeout = 100; | |
1825 | int spawn_cap = 4; | |
1826 | struct parallel_processes pp; | |
1827 | ||
1828 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1829 | while (1) { | |
1830 | for (i = 0; | |
1831 | i < spawn_cap && !pp.shutdown && | |
1832 | pp.nr_processes < pp.max_processes; | |
1833 | i++) { | |
1834 | code = pp_start_one(&pp); | |
1835 | if (!code) | |
1836 | continue; | |
1837 | if (code < 0) { | |
1838 | pp.shutdown = 1; | |
1839 | kill_children(&pp, -code); | |
1840 | } | |
1841 | break; | |
1842 | } | |
1843 | if (!pp.nr_processes) | |
1844 | break; | |
1845 | pp_buffer_stderr(&pp, output_timeout); | |
1846 | pp_output(&pp); | |
1847 | code = pp_collect_finished(&pp); | |
1848 | if (code) { | |
1849 | pp.shutdown = 1; | |
1850 | if (code < 0) | |
1851 | kill_children(&pp, -code); | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | pp_cleanup(&pp); | |
1856 | return 0; | |
1857 | } | |
ee4512ed JH |
1858 | |
1859 | int run_processes_parallel_tr2(int n, get_next_task_fn get_next_task, | |
1860 | start_failure_fn start_failure, | |
1861 | task_finished_fn task_finished, void *pp_cb, | |
1862 | const char *tr2_category, const char *tr2_label) | |
1863 | { | |
1864 | int result; | |
1865 | ||
1866 | trace2_region_enter_printf(tr2_category, tr2_label, NULL, "max:%d", | |
1867 | ((n < 1) ? online_cpus() : n)); | |
1868 | ||
1869 | result = run_processes_parallel(n, get_next_task, start_failure, | |
1870 | task_finished, pp_cb); | |
1871 | ||
1872 | trace2_region_leave(tr2_category, tr2_label, NULL); | |
1873 | ||
1874 | return result; | |
1875 | } | |
850b6ede | 1876 | |
a95ce124 | 1877 | int run_auto_maintenance(int quiet) |
850b6ede | 1878 | { |
1942d483 | 1879 | int enabled; |
a95ce124 | 1880 | struct child_process maint = CHILD_PROCESS_INIT; |
850b6ede | 1881 | |
1942d483 DS |
1882 | if (!git_config_get_bool("maintenance.auto", &enabled) && |
1883 | !enabled) | |
1884 | return 0; | |
1885 | ||
a95ce124 DS |
1886 | maint.git_cmd = 1; |
1887 | strvec_pushl(&maint.args, "maintenance", "run", "--auto", NULL); | |
1888 | strvec_push(&maint.args, quiet ? "--quiet" : "--no-quiet"); | |
1889 | ||
1890 | return run_command(&maint); | |
850b6ede | 1891 | } |
d1fa9435 JT |
1892 | |
1893 | void prepare_other_repo_env(struct strvec *env_array, const char *new_git_dir) | |
1894 | { | |
1895 | const char * const *var; | |
1896 | ||
1897 | for (var = local_repo_env; *var; var++) { | |
1898 | if (strcmp(*var, CONFIG_DATA_ENVIRONMENT) && | |
1899 | strcmp(*var, CONFIG_COUNT_ENVIRONMENT)) | |
1900 | strvec_push(env_array, *var); | |
1901 | } | |
1902 | strvec_pushf(env_array, "%s=%s", GIT_DIR_ENVIRONMENT, new_git_dir); | |
1903 | } |