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