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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" |
28d04e1e | 11 | #include "packfile.h" |
5e3aba33 | 12 | #include "hook.h" |
b1bf95bb | 13 | |
483bbd4e RS |
14 | void child_process_init(struct child_process *child) |
15 | { | |
5726a6b4 ÆAB |
16 | struct child_process blank = CHILD_PROCESS_INIT; |
17 | memcpy(child, &blank, sizeof(*child)); | |
483bbd4e RS |
18 | } |
19 | ||
2d71608e RS |
20 | void child_process_clear(struct child_process *child) |
21 | { | |
c972bf4c JK |
22 | strvec_clear(&child->args); |
23 | strvec_clear(&child->env_array); | |
2d71608e RS |
24 | } |
25 | ||
afe19ff7 JK |
26 | struct child_to_clean { |
27 | pid_t pid; | |
ac2fbaa6 | 28 | struct child_process *process; |
afe19ff7 JK |
29 | struct child_to_clean *next; |
30 | }; | |
31 | static struct child_to_clean *children_to_clean; | |
32 | static int installed_child_cleanup_handler; | |
33 | ||
507d7804 | 34 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 | 35 | { |
46df6906 JK |
36 | struct child_to_clean *children_to_wait_for = NULL; |
37 | ||
afe19ff7 JK |
38 | while (children_to_clean) { |
39 | struct child_to_clean *p = children_to_clean; | |
40 | children_to_clean = p->next; | |
ac2fbaa6 LS |
41 | |
42 | if (p->process && !in_signal) { | |
43 | struct child_process *process = p->process; | |
44 | if (process->clean_on_exit_handler) { | |
45 | trace_printf( | |
46 | "trace: run_command: running exit handler for pid %" | |
47 | PRIuMAX, (uintmax_t)p->pid | |
48 | ); | |
49 | process->clean_on_exit_handler(process); | |
50 | } | |
51 | } | |
52 | ||
afe19ff7 | 53 | kill(p->pid, sig); |
46df6906 | 54 | |
7b91929b | 55 | if (p->process && p->process->wait_after_clean) { |
46df6906 JK |
56 | p->next = children_to_wait_for; |
57 | children_to_wait_for = p; | |
58 | } else { | |
59 | if (!in_signal) | |
60 | free(p); | |
61 | } | |
62 | } | |
63 | ||
64 | while (children_to_wait_for) { | |
65 | struct child_to_clean *p = children_to_wait_for; | |
66 | children_to_wait_for = p->next; | |
67 | ||
68 | while (waitpid(p->pid, NULL, 0) < 0 && errno == EINTR) | |
69 | ; /* spin waiting for process exit or error */ | |
70 | ||
507d7804 TI |
71 | if (!in_signal) |
72 | free(p); | |
afe19ff7 JK |
73 | } |
74 | } | |
75 | ||
76 | static void cleanup_children_on_signal(int sig) | |
77 | { | |
507d7804 | 78 | cleanup_children(sig, 1); |
afe19ff7 JK |
79 | sigchain_pop(sig); |
80 | raise(sig); | |
81 | } | |
82 | ||
83 | static void cleanup_children_on_exit(void) | |
84 | { | |
507d7804 | 85 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
86 | } |
87 | ||
ac2fbaa6 | 88 | static void mark_child_for_cleanup(pid_t pid, struct child_process *process) |
afe19ff7 JK |
89 | { |
90 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
91 | p->pid = pid; | |
ac2fbaa6 | 92 | p->process = process; |
afe19ff7 JK |
93 | p->next = children_to_clean; |
94 | children_to_clean = p; | |
95 | ||
96 | if (!installed_child_cleanup_handler) { | |
97 | atexit(cleanup_children_on_exit); | |
98 | sigchain_push_common(cleanup_children_on_signal); | |
99 | installed_child_cleanup_handler = 1; | |
100 | } | |
101 | } | |
102 | ||
103 | static void clear_child_for_cleanup(pid_t pid) | |
104 | { | |
bdee397d | 105 | struct child_to_clean **pp; |
afe19ff7 | 106 | |
bdee397d DG |
107 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
108 | struct child_to_clean *clean_me = *pp; | |
109 | ||
110 | if (clean_me->pid == pid) { | |
111 | *pp = clean_me->next; | |
112 | free(clean_me); | |
afe19ff7 JK |
113 | return; |
114 | } | |
115 | } | |
116 | } | |
117 | ||
9dc09c76 SP |
118 | static inline void close_pair(int fd[2]) |
119 | { | |
120 | close(fd[0]); | |
121 | close(fd[1]); | |
122 | } | |
123 | ||
38124a40 BW |
124 | int is_executable(const char *name) |
125 | { | |
126 | struct stat st; | |
127 | ||
128 | if (stat(name, &st) || /* stat, not lstat */ | |
129 | !S_ISREG(st.st_mode)) | |
130 | return 0; | |
131 | ||
132 | #if defined(GIT_WINDOWS_NATIVE) | |
133 | /* | |
134 | * On Windows there is no executable bit. The file extension | |
135 | * indicates whether it can be run as an executable, and Git | |
136 | * has special-handling to detect scripts and launch them | |
137 | * through the indicated script interpreter. We test for the | |
138 | * file extension first because virus scanners may make | |
139 | * it quite expensive to open many files. | |
140 | */ | |
141 | if (ends_with(name, ".exe")) | |
142 | return S_IXUSR; | |
143 | ||
144 | { | |
145 | /* | |
146 | * Now that we know it does not have an executable extension, | |
147 | * peek into the file instead. | |
148 | */ | |
149 | char buf[3] = { 0 }; | |
150 | int n; | |
151 | int fd = open(name, O_RDONLY); | |
152 | st.st_mode &= ~S_IXUSR; | |
153 | if (fd >= 0) { | |
154 | n = read(fd, buf, 2); | |
155 | if (n == 2) | |
156 | /* look for a she-bang */ | |
157 | if (!strcmp(buf, "#!")) | |
158 | st.st_mode |= S_IXUSR; | |
159 | close(fd); | |
160 | } | |
161 | } | |
162 | #endif | |
163 | return st.st_mode & S_IXUSR; | |
164 | } | |
165 | ||
94028310 BW |
166 | /* |
167 | * Search $PATH for a command. This emulates the path search that | |
168 | * execvp would perform, without actually executing the command so it | |
169 | * can be used before fork() to prepare to run a command using | |
170 | * execve() or after execvp() to diagnose why it failed. | |
171 | * | |
172 | * The caller should ensure that file contains no directory | |
173 | * separators. | |
174 | * | |
175 | * Returns the path to the command, as found in $PATH or NULL if the | |
176 | * command could not be found. The caller inherits ownership of the memory | |
177 | * used to store the resultant path. | |
178 | * | |
179 | * This should not be used on Windows, where the $PATH search rules | |
180 | * are more complicated (e.g., a search for "foo" should find | |
181 | * "foo.exe"). | |
182 | */ | |
38f865c2 JK |
183 | static char *locate_in_PATH(const char *file) |
184 | { | |
185 | const char *p = getenv("PATH"); | |
186 | struct strbuf buf = STRBUF_INIT; | |
187 | ||
188 | if (!p || !*p) | |
189 | return NULL; | |
190 | ||
191 | while (1) { | |
192 | const char *end = strchrnul(p, ':'); | |
193 | ||
194 | strbuf_reset(&buf); | |
195 | ||
196 | /* POSIX specifies an empty entry as the current directory. */ | |
197 | if (end != p) { | |
198 | strbuf_add(&buf, p, end - p); | |
199 | strbuf_addch(&buf, '/'); | |
200 | } | |
201 | strbuf_addstr(&buf, file); | |
202 | ||
94028310 | 203 | if (is_executable(buf.buf)) |
38f865c2 JK |
204 | return strbuf_detach(&buf, NULL); |
205 | ||
206 | if (!*end) | |
207 | break; | |
208 | p = end + 1; | |
209 | } | |
210 | ||
211 | strbuf_release(&buf); | |
212 | return NULL; | |
213 | } | |
214 | ||
3f36e6f3 | 215 | int exists_in_PATH(const char *command) |
38f865c2 | 216 | { |
3f36e6f3 | 217 | char *r = locate_in_PATH(command); |
63ab08fb | 218 | int found = r != NULL; |
38f865c2 | 219 | free(r); |
63ab08fb | 220 | return found; |
38f865c2 JK |
221 | } |
222 | ||
223 | int sane_execvp(const char *file, char * const argv[]) | |
224 | { | |
ee4512ed JH |
225 | #ifndef GIT_WINDOWS_NATIVE |
226 | /* | |
227 | * execvp() doesn't return, so we all we can do is tell trace2 | |
228 | * what we are about to do and let it leave a hint in the log | |
229 | * (unless of course the execvp() fails). | |
230 | * | |
231 | * we skip this for Windows because the compat layer already | |
232 | * has to emulate the execvp() call anyway. | |
233 | */ | |
234 | int exec_id = trace2_exec(file, (const char **)argv); | |
235 | #endif | |
236 | ||
38f865c2 JK |
237 | if (!execvp(file, argv)) |
238 | return 0; /* cannot happen ;-) */ | |
239 | ||
ee4512ed JH |
240 | #ifndef GIT_WINDOWS_NATIVE |
241 | { | |
242 | int ec = errno; | |
243 | trace2_exec_result(exec_id, ec); | |
244 | errno = ec; | |
245 | } | |
246 | #endif | |
247 | ||
38f865c2 JK |
248 | /* |
249 | * When a command can't be found because one of the directories | |
250 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
251 | * careful usability testing (read: analysis of occasional bug | |
252 | * reports) reveals that "No such file or directory" is more | |
253 | * intuitive. | |
254 | * | |
255 | * We avoid commands with "/", because execvp will not do $PATH | |
256 | * lookups in that case. | |
257 | * | |
258 | * The reassignment of EACCES to errno looks like a no-op below, | |
259 | * but we need to protect against exists_in_PATH overwriting errno. | |
260 | */ | |
261 | if (errno == EACCES && !strchr(file, '/')) | |
262 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
263 | else if (errno == ENOTDIR && !strchr(file, '/')) |
264 | errno = ENOENT; | |
38f865c2 JK |
265 | return -1; |
266 | } | |
267 | ||
c972bf4c | 268 | static const char **prepare_shell_cmd(struct strvec *out, const char **argv) |
8dba1e63 | 269 | { |
20574f55 | 270 | if (!argv[0]) |
033abf97 | 271 | BUG("shell command is empty"); |
8dba1e63 | 272 | |
f445644f | 273 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 274 | #ifndef GIT_WINDOWS_NATIVE |
c972bf4c | 275 | strvec_push(out, SHELL_PATH); |
77629754 | 276 | #else |
c972bf4c | 277 | strvec_push(out, "sh"); |
77629754 | 278 | #endif |
c972bf4c | 279 | strvec_push(out, "-c"); |
8dba1e63 | 280 | |
20574f55 JK |
281 | /* |
282 | * If we have no extra arguments, we do not even need to | |
283 | * bother with the "$@" magic. | |
284 | */ | |
285 | if (!argv[1]) | |
c972bf4c | 286 | strvec_push(out, argv[0]); |
20574f55 | 287 | else |
c972bf4c | 288 | strvec_pushf(out, "%s \"$@\"", argv[0]); |
20574f55 | 289 | } |
8dba1e63 | 290 | |
c972bf4c | 291 | strvec_pushv(out, argv); |
d70a9eb6 | 292 | return out->v; |
8dba1e63 JK |
293 | } |
294 | ||
380395d0 | 295 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
296 | static int child_notifier = -1; |
297 | ||
79319b19 BW |
298 | enum child_errcode { |
299 | CHILD_ERR_CHDIR, | |
53fa6753 BW |
300 | CHILD_ERR_DUP2, |
301 | CHILD_ERR_CLOSE, | |
45afb1ca | 302 | CHILD_ERR_SIGPROCMASK, |
79319b19 BW |
303 | CHILD_ERR_ENOENT, |
304 | CHILD_ERR_SILENT, | |
305 | CHILD_ERR_ERRNO | |
306 | }; | |
307 | ||
308 | struct child_err { | |
309 | enum child_errcode err; | |
310 | int syserr; /* errno */ | |
311 | }; | |
312 | ||
313 | static void child_die(enum child_errcode err) | |
2b541bf8 | 314 | { |
79319b19 BW |
315 | struct child_err buf; |
316 | ||
317 | buf.err = err; | |
318 | buf.syserr = errno; | |
319 | ||
320 | /* write(2) on buf smaller than PIPE_BUF (min 512) is atomic: */ | |
321 | xwrite(child_notifier, &buf, sizeof(buf)); | |
322 | _exit(1); | |
323 | } | |
324 | ||
53fa6753 BW |
325 | static void child_dup2(int fd, int to) |
326 | { | |
327 | if (dup2(fd, to) < 0) | |
328 | child_die(CHILD_ERR_DUP2); | |
329 | } | |
330 | ||
331 | static void child_close(int fd) | |
332 | { | |
333 | if (close(fd)) | |
334 | child_die(CHILD_ERR_CLOSE); | |
335 | } | |
336 | ||
337 | static void child_close_pair(int fd[2]) | |
338 | { | |
339 | child_close(fd[0]); | |
340 | child_close(fd[1]); | |
341 | } | |
342 | ||
79319b19 BW |
343 | /* |
344 | * parent will make it look like the child spewed a fatal error and died | |
345 | * this is needed to prevent changes to t0061. | |
346 | */ | |
347 | static void fake_fatal(const char *err, va_list params) | |
348 | { | |
349 | vreportf("fatal: ", err, params); | |
350 | } | |
351 | ||
352 | static void child_error_fn(const char *err, va_list params) | |
353 | { | |
354 | const char msg[] = "error() should not be called in child\n"; | |
355 | xwrite(2, msg, sizeof(msg) - 1); | |
356 | } | |
357 | ||
358 | static void child_warn_fn(const char *err, va_list params) | |
359 | { | |
360 | const char msg[] = "warn() should not be called in child\n"; | |
361 | xwrite(2, msg, sizeof(msg) - 1); | |
362 | } | |
363 | ||
364 | static void NORETURN child_die_fn(const char *err, va_list params) | |
365 | { | |
366 | const char msg[] = "die() should not be called in child\n"; | |
367 | xwrite(2, msg, sizeof(msg) - 1); | |
368 | _exit(2); | |
369 | } | |
370 | ||
371 | /* this runs in the parent process */ | |
372 | static void child_err_spew(struct child_process *cmd, struct child_err *cerr) | |
373 | { | |
374 | static void (*old_errfn)(const char *err, va_list params); | |
375 | ||
376 | old_errfn = get_error_routine(); | |
377 | set_error_routine(fake_fatal); | |
378 | errno = cerr->syserr; | |
379 | ||
380 | switch (cerr->err) { | |
381 | case CHILD_ERR_CHDIR: | |
382 | error_errno("exec '%s': cd to '%s' failed", | |
383 | cmd->argv[0], cmd->dir); | |
384 | break; | |
53fa6753 BW |
385 | case CHILD_ERR_DUP2: |
386 | error_errno("dup2() in child failed"); | |
387 | break; | |
388 | case CHILD_ERR_CLOSE: | |
389 | error_errno("close() in child failed"); | |
390 | break; | |
45afb1ca EW |
391 | case CHILD_ERR_SIGPROCMASK: |
392 | error_errno("sigprocmask failed restoring signals"); | |
393 | break; | |
79319b19 BW |
394 | case CHILD_ERR_ENOENT: |
395 | error_errno("cannot run %s", cmd->argv[0]); | |
396 | break; | |
397 | case CHILD_ERR_SILENT: | |
398 | break; | |
399 | case CHILD_ERR_ERRNO: | |
400 | error_errno("cannot exec '%s'", cmd->argv[0]); | |
401 | break; | |
402 | } | |
403 | set_error_routine(old_errfn); | |
2b541bf8 | 404 | } |
3967e25b | 405 | |
c972bf4c | 406 | static int prepare_cmd(struct strvec *out, const struct child_process *cmd) |
3967e25b BW |
407 | { |
408 | if (!cmd->argv[0]) | |
033abf97 | 409 | BUG("command is empty"); |
3967e25b | 410 | |
e3a43446 BW |
411 | /* |
412 | * Add SHELL_PATH so in the event exec fails with ENOEXEC we can | |
413 | * attempt to interpret the command with 'sh'. | |
414 | */ | |
c972bf4c | 415 | strvec_push(out, SHELL_PATH); |
e3a43446 | 416 | |
3967e25b | 417 | if (cmd->git_cmd) { |
54a7a646 | 418 | prepare_git_cmd(out, cmd->argv); |
3967e25b BW |
419 | } else if (cmd->use_shell) { |
420 | prepare_shell_cmd(out, cmd->argv); | |
421 | } else { | |
c972bf4c | 422 | strvec_pushv(out, cmd->argv); |
3967e25b | 423 | } |
e3a43446 BW |
424 | |
425 | /* | |
05ac8582 AK |
426 | * If there are no dir separator characters in the command then perform |
427 | * a path lookup and use the resolved path as the command to exec. If | |
428 | * there are dir separator characters, we have exec attempt to invoke | |
429 | * the command directly. | |
e3a43446 | 430 | */ |
d70a9eb6 JK |
431 | if (!has_dir_sep(out->v[1])) { |
432 | char *program = locate_in_PATH(out->v[1]); | |
e3a43446 | 433 | if (program) { |
d70a9eb6 JK |
434 | free((char *)out->v[1]); |
435 | out->v[1] = program; | |
321fd823 | 436 | } else { |
c972bf4c | 437 | strvec_clear(out); |
321fd823 JK |
438 | errno = ENOENT; |
439 | return -1; | |
e3a43446 BW |
440 | } |
441 | } | |
321fd823 JK |
442 | |
443 | return 0; | |
3967e25b | 444 | } |
ae25394b BW |
445 | |
446 | static char **prep_childenv(const char *const *deltaenv) | |
447 | { | |
448 | extern char **environ; | |
449 | char **childenv; | |
450 | struct string_list env = STRING_LIST_INIT_DUP; | |
451 | struct strbuf key = STRBUF_INIT; | |
452 | const char *const *p; | |
453 | int i; | |
454 | ||
455 | /* Construct a sorted string list consisting of the current environ */ | |
456 | for (p = (const char *const *) environ; p && *p; p++) { | |
457 | const char *equals = strchr(*p, '='); | |
458 | ||
459 | if (equals) { | |
460 | strbuf_reset(&key); | |
461 | strbuf_add(&key, *p, equals - *p); | |
462 | string_list_append(&env, key.buf)->util = (void *) *p; | |
463 | } else { | |
464 | string_list_append(&env, *p)->util = (void *) *p; | |
465 | } | |
466 | } | |
467 | string_list_sort(&env); | |
468 | ||
469 | /* Merge in 'deltaenv' with the current environ */ | |
470 | for (p = deltaenv; p && *p; p++) { | |
471 | const char *equals = strchr(*p, '='); | |
472 | ||
473 | if (equals) { | |
474 | /* ('key=value'), insert or replace entry */ | |
475 | strbuf_reset(&key); | |
476 | strbuf_add(&key, *p, equals - *p); | |
477 | string_list_insert(&env, key.buf)->util = (void *) *p; | |
478 | } else { | |
479 | /* otherwise ('key') remove existing entry */ | |
480 | string_list_remove(&env, *p, 0); | |
481 | } | |
482 | } | |
483 | ||
484 | /* Create an array of 'char *' to be used as the childenv */ | |
0e187d75 | 485 | ALLOC_ARRAY(childenv, env.nr + 1); |
ae25394b BW |
486 | for (i = 0; i < env.nr; i++) |
487 | childenv[i] = env.items[i].util; | |
488 | childenv[env.nr] = NULL; | |
489 | ||
490 | string_list_clear(&env, 0); | |
491 | strbuf_release(&key); | |
492 | return childenv; | |
493 | } | |
45afb1ca EW |
494 | |
495 | struct atfork_state { | |
496 | #ifndef NO_PTHREADS | |
497 | int cs; | |
498 | #endif | |
499 | sigset_t old; | |
500 | }; | |
501 | ||
dde74d73 JS |
502 | #define CHECK_BUG(err, msg) \ |
503 | do { \ | |
504 | int e = (err); \ | |
505 | if (e) \ | |
506 | BUG("%s: %s", msg, strerror(e)); \ | |
507 | } while(0) | |
45afb1ca EW |
508 | |
509 | static void atfork_prepare(struct atfork_state *as) | |
510 | { | |
511 | sigset_t all; | |
512 | ||
513 | if (sigfillset(&all)) | |
514 | die_errno("sigfillset"); | |
515 | #ifdef NO_PTHREADS | |
516 | if (sigprocmask(SIG_SETMASK, &all, &as->old)) | |
517 | die_errno("sigprocmask"); | |
518 | #else | |
dde74d73 | 519 | CHECK_BUG(pthread_sigmask(SIG_SETMASK, &all, &as->old), |
45afb1ca | 520 | "blocking all signals"); |
dde74d73 | 521 | CHECK_BUG(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs), |
45afb1ca EW |
522 | "disabling cancellation"); |
523 | #endif | |
524 | } | |
525 | ||
526 | static void atfork_parent(struct atfork_state *as) | |
527 | { | |
528 | #ifdef NO_PTHREADS | |
529 | if (sigprocmask(SIG_SETMASK, &as->old, NULL)) | |
530 | die_errno("sigprocmask"); | |
531 | #else | |
dde74d73 | 532 | CHECK_BUG(pthread_setcancelstate(as->cs, NULL), |
45afb1ca | 533 | "re-enabling cancellation"); |
dde74d73 | 534 | CHECK_BUG(pthread_sigmask(SIG_SETMASK, &as->old, NULL), |
45afb1ca | 535 | "restoring signal mask"); |
200a76b7 | 536 | #endif |
45afb1ca EW |
537 | } |
538 | #endif /* GIT_WINDOWS_NATIVE */ | |
a5487ddf JS |
539 | |
540 | static inline void set_cloexec(int fd) | |
541 | { | |
542 | int flags = fcntl(fd, F_GETFD); | |
543 | if (flags >= 0) | |
544 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
545 | } | |
a5487ddf | 546 | |
507d7804 | 547 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
548 | { |
549 | int status, code = -1; | |
550 | pid_t waiting; | |
551 | int failed_errno = 0; | |
552 | ||
553 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
554 | ; /* nothing */ | |
85db79a9 | 555 | if (in_signal) { |
be8fc53e ÆAB |
556 | if (WIFEXITED(status)) |
557 | code = WEXITSTATUS(status); | |
558 | return code; | |
85db79a9 | 559 | } |
ab0b41da JS |
560 | |
561 | if (waiting < 0) { | |
562 | failed_errno = errno; | |
fbcb0e06 | 563 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
564 | } else if (waiting != pid) { |
565 | error("waitpid is confused (%s)", argv0); | |
566 | } else if (WIFSIGNALED(status)) { | |
567 | code = WTERMSIG(status); | |
ac78663b | 568 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 569 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
570 | /* |
571 | * This return value is chosen so that code & 0xff | |
572 | * mimics the exit code that a POSIX shell would report for | |
573 | * a program that died from this signal. | |
574 | */ | |
709ca730 | 575 | code += 128; |
ab0b41da JS |
576 | } else if (WIFEXITED(status)) { |
577 | code = WEXITSTATUS(status); | |
ab0b41da JS |
578 | } else { |
579 | error("waitpid is confused (%s)", argv0); | |
580 | } | |
afe19ff7 JK |
581 | |
582 | clear_child_for_cleanup(pid); | |
583 | ||
ab0b41da JS |
584 | errno = failed_errno; |
585 | return code; | |
586 | } | |
587 | ||
c61a975d NTND |
588 | static void trace_add_env(struct strbuf *dst, const char *const *deltaenv) |
589 | { | |
590 | struct string_list envs = STRING_LIST_INIT_DUP; | |
591 | const char *const *e; | |
592 | int i; | |
593 | int printed_unset = 0; | |
594 | ||
595 | /* Last one wins, see run-command.c:prep_childenv() for context */ | |
596 | for (e = deltaenv; e && *e; e++) { | |
597 | struct strbuf key = STRBUF_INIT; | |
598 | char *equals = strchr(*e, '='); | |
599 | ||
600 | if (equals) { | |
601 | strbuf_add(&key, *e, equals - *e); | |
602 | string_list_insert(&envs, key.buf)->util = equals + 1; | |
603 | } else { | |
604 | string_list_insert(&envs, *e)->util = NULL; | |
605 | } | |
606 | strbuf_release(&key); | |
607 | } | |
608 | ||
609 | /* "unset X Y...;" */ | |
610 | for (i = 0; i < envs.nr; i++) { | |
611 | const char *var = envs.items[i].string; | |
612 | const char *val = envs.items[i].util; | |
613 | ||
614 | if (val || !getenv(var)) | |
615 | continue; | |
616 | ||
617 | if (!printed_unset) { | |
618 | strbuf_addstr(dst, " unset"); | |
619 | printed_unset = 1; | |
620 | } | |
621 | strbuf_addf(dst, " %s", var); | |
622 | } | |
623 | if (printed_unset) | |
624 | strbuf_addch(dst, ';'); | |
625 | ||
626 | /* ... followed by "A=B C=D ..." */ | |
627 | for (i = 0; i < envs.nr; i++) { | |
628 | const char *var = envs.items[i].string; | |
629 | const char *val = envs.items[i].util; | |
630 | const char *oldval; | |
631 | ||
632 | if (!val) | |
633 | continue; | |
634 | ||
635 | oldval = getenv(var); | |
636 | if (oldval && !strcmp(val, oldval)) | |
637 | continue; | |
638 | ||
639 | strbuf_addf(dst, " %s=", var); | |
640 | sq_quote_buf_pretty(dst, val); | |
641 | } | |
642 | string_list_clear(&envs, 0); | |
643 | } | |
644 | ||
e73dd786 NTND |
645 | static void trace_run_command(const struct child_process *cp) |
646 | { | |
647 | struct strbuf buf = STRBUF_INIT; | |
648 | ||
649 | if (!trace_want(&trace_default_key)) | |
650 | return; | |
651 | ||
248f66ed | 652 | strbuf_addstr(&buf, "trace: run_command:"); |
090a0927 NTND |
653 | if (cp->dir) { |
654 | strbuf_addstr(&buf, " cd "); | |
655 | sq_quote_buf_pretty(&buf, cp->dir); | |
656 | strbuf_addch(&buf, ';'); | |
657 | } | |
c61a975d NTND |
658 | /* |
659 | * The caller is responsible for initializing cp->env from | |
660 | * cp->env_array if needed. We only check one place. | |
661 | */ | |
662 | if (cp->env) | |
663 | trace_add_env(&buf, cp->env); | |
21dfc5e0 NTND |
664 | if (cp->git_cmd) |
665 | strbuf_addstr(&buf, " git"); | |
e73dd786 NTND |
666 | sq_quote_argv_pretty(&buf, cp->argv); |
667 | ||
668 | trace_printf("%s", buf.buf); | |
669 | strbuf_release(&buf); | |
670 | } | |
671 | ||
ebcb5d16 | 672 | int start_command(struct child_process *cmd) |
b1bf95bb | 673 | { |
f3b33f1d JS |
674 | int need_in, need_out, need_err; |
675 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 676 | int failed_errno; |
939296c4 | 677 | char *str; |
4919bf03 | 678 | |
c460c0ec | 679 | if (!cmd->argv) |
d70a9eb6 | 680 | cmd->argv = cmd->args.v; |
19a583dc | 681 | if (!cmd->env) |
d70a9eb6 | 682 | cmd->env = cmd->env_array.v; |
c460c0ec | 683 | |
c20181e3 JS |
684 | /* |
685 | * In case of errors we must keep the promise to close FDs | |
686 | * that have been passed in via ->in and ->out. | |
687 | */ | |
688 | ||
e4507ae8 | 689 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 690 | if (need_in) { |
c20181e3 | 691 | if (pipe(fdin) < 0) { |
0ac77ec3 | 692 | failed_errno = errno; |
c20181e3 JS |
693 | if (cmd->out > 0) |
694 | close(cmd->out); | |
939296c4 | 695 | str = "standard input"; |
0ac77ec3 | 696 | goto fail_pipe; |
c20181e3 | 697 | } |
4919bf03 | 698 | cmd->in = fdin[1]; |
4919bf03 SP |
699 | } |
700 | ||
e4507ae8 SP |
701 | need_out = !cmd->no_stdout |
702 | && !cmd->stdout_to_stderr | |
703 | && cmd->out < 0; | |
f4bba25b SP |
704 | if (need_out) { |
705 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 706 | failed_errno = errno; |
f4bba25b SP |
707 | if (need_in) |
708 | close_pair(fdin); | |
c20181e3 JS |
709 | else if (cmd->in) |
710 | close(cmd->in); | |
939296c4 | 711 | str = "standard output"; |
0ac77ec3 | 712 | goto fail_pipe; |
f4bba25b SP |
713 | } |
714 | cmd->out = fdout[0]; | |
f4bba25b SP |
715 | } |
716 | ||
b73a4397 | 717 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
718 | if (need_err) { |
719 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 720 | failed_errno = errno; |
f3b33f1d JS |
721 | if (need_in) |
722 | close_pair(fdin); | |
c20181e3 JS |
723 | else if (cmd->in) |
724 | close(cmd->in); | |
f3b33f1d JS |
725 | if (need_out) |
726 | close_pair(fdout); | |
c20181e3 JS |
727 | else if (cmd->out) |
728 | close(cmd->out); | |
939296c4 | 729 | str = "standard error"; |
0ac77ec3 | 730 | fail_pipe: |
939296c4 SB |
731 | error("cannot create %s pipe for %s: %s", |
732 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 733 | child_process_clear(cmd); |
0ac77ec3 JS |
734 | errno = failed_errno; |
735 | return -1; | |
f3b33f1d JS |
736 | } |
737 | cmd->err = fderr[0]; | |
738 | } | |
739 | ||
ee4512ed | 740 | trace2_child_start(cmd); |
e73dd786 NTND |
741 | trace_run_command(cmd); |
742 | ||
13af8cbd | 743 | fflush(NULL); |
8852f5d7 | 744 | |
28d04e1e JS |
745 | if (cmd->close_object_store) |
746 | close_object_store(the_repository->objects); | |
747 | ||
380395d0 | 748 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
749 | { |
750 | int notify_pipe[2]; | |
db015a28 | 751 | int null_fd = -1; |
ae25394b | 752 | char **childenv; |
c972bf4c | 753 | struct strvec argv = STRVEC_INIT; |
79319b19 | 754 | struct child_err cerr; |
45afb1ca | 755 | struct atfork_state as; |
3967e25b | 756 | |
321fd823 JK |
757 | if (prepare_cmd(&argv, cmd) < 0) { |
758 | failed_errno = errno; | |
759 | cmd->pid = -1; | |
e5a329a2 JH |
760 | if (!cmd->silent_exec_failure) |
761 | error_errno("cannot run %s", cmd->argv[0]); | |
321fd823 JK |
762 | goto end_of_spawn; |
763 | } | |
764 | ||
2b541bf8 JS |
765 | if (pipe(notify_pipe)) |
766 | notify_pipe[0] = notify_pipe[1] = -1; | |
767 | ||
db015a28 | 768 | if (cmd->no_stdin || cmd->no_stdout || cmd->no_stderr) { |
66e905b7 | 769 | null_fd = xopen("/dev/null", O_RDWR | O_CLOEXEC); |
db015a28 BW |
770 | set_cloexec(null_fd); |
771 | } | |
772 | ||
ae25394b | 773 | childenv = prep_childenv(cmd->env); |
45afb1ca | 774 | atfork_prepare(&as); |
3967e25b | 775 | |
e503cd6e BW |
776 | /* |
777 | * NOTE: In order to prevent deadlocking when using threads special | |
778 | * care should be taken with the function calls made in between the | |
779 | * fork() and exec() calls. No calls should be made to functions which | |
780 | * require acquiring a lock (e.g. malloc) as the lock could have been | |
781 | * held by another thread at the time of forking, causing the lock to | |
782 | * never be released in the child process. This means only | |
783 | * Async-Signal-Safe functions are permitted in the child. | |
784 | */ | |
ebcb5d16 | 785 | cmd->pid = fork(); |
25043d8a | 786 | failed_errno = errno; |
ebcb5d16 | 787 | if (!cmd->pid) { |
45afb1ca | 788 | int sig; |
a5487ddf | 789 | /* |
79319b19 BW |
790 | * Ensure the default die/error/warn routines do not get |
791 | * called, they can take stdio locks and malloc. | |
a5487ddf | 792 | */ |
79319b19 BW |
793 | set_die_routine(child_die_fn); |
794 | set_error_routine(child_error_fn); | |
795 | set_warn_routine(child_warn_fn); | |
a5487ddf | 796 | |
2b541bf8 JS |
797 | close(notify_pipe[0]); |
798 | set_cloexec(notify_pipe[1]); | |
799 | child_notifier = notify_pipe[1]; | |
2b541bf8 | 800 | |
e4507ae8 | 801 | if (cmd->no_stdin) |
53fa6753 | 802 | child_dup2(null_fd, 0); |
e4507ae8 | 803 | else if (need_in) { |
53fa6753 BW |
804 | child_dup2(fdin[0], 0); |
805 | child_close_pair(fdin); | |
4919bf03 | 806 | } else if (cmd->in) { |
53fa6753 BW |
807 | child_dup2(cmd->in, 0); |
808 | child_close(cmd->in); | |
95d3c4f5 | 809 | } |
4919bf03 | 810 | |
ce2cf27a | 811 | if (cmd->no_stderr) |
53fa6753 | 812 | child_dup2(null_fd, 2); |
ce2cf27a | 813 | else if (need_err) { |
53fa6753 BW |
814 | child_dup2(fderr[1], 2); |
815 | child_close_pair(fderr); | |
4f41b611 | 816 | } else if (cmd->err > 1) { |
53fa6753 BW |
817 | child_dup2(cmd->err, 2); |
818 | child_close(cmd->err); | |
ce2cf27a CC |
819 | } |
820 | ||
e4507ae8 | 821 | if (cmd->no_stdout) |
53fa6753 | 822 | child_dup2(null_fd, 1); |
e4507ae8 | 823 | else if (cmd->stdout_to_stderr) |
53fa6753 | 824 | child_dup2(2, 1); |
f4bba25b | 825 | else if (need_out) { |
53fa6753 BW |
826 | child_dup2(fdout[1], 1); |
827 | child_close_pair(fdout); | |
f4bba25b | 828 | } else if (cmd->out > 1) { |
53fa6753 BW |
829 | child_dup2(cmd->out, 1); |
830 | child_close(cmd->out); | |
f4bba25b SP |
831 | } |
832 | ||
1568fea0 | 833 | if (cmd->dir && chdir(cmd->dir)) |
79319b19 | 834 | child_die(CHILD_ERR_CHDIR); |
3967e25b | 835 | |
45afb1ca EW |
836 | /* |
837 | * restore default signal handlers here, in case | |
838 | * we catch a signal right before execve below | |
839 | */ | |
840 | for (sig = 1; sig < NSIG; sig++) { | |
841 | /* ignored signals get reset to SIG_DFL on execve */ | |
842 | if (signal(sig, SIG_DFL) == SIG_IGN) | |
843 | signal(sig, SIG_IGN); | |
844 | } | |
845 | ||
846 | if (sigprocmask(SIG_SETMASK, &as.old, NULL) != 0) | |
847 | child_die(CHILD_ERR_SIGPROCMASK); | |
848 | ||
e3a43446 BW |
849 | /* |
850 | * Attempt to exec using the command and arguments starting at | |
851 | * argv.argv[1]. argv.argv[0] contains SHELL_PATH which will | |
852 | * be used in the event exec failed with ENOEXEC at which point | |
853 | * we will try to interpret the command using 'sh'. | |
854 | */ | |
d70a9eb6 | 855 | execve(argv.v[1], (char *const *) argv.v + 1, |
ae25394b | 856 | (char *const *) childenv); |
e3a43446 | 857 | if (errno == ENOEXEC) |
d70a9eb6 | 858 | execve(argv.v[0], (char *const *) argv.v, |
ae25394b | 859 | (char *const *) childenv); |
3967e25b | 860 | |
fc1b56f0 | 861 | if (errno == ENOENT) { |
79319b19 BW |
862 | if (cmd->silent_exec_failure) |
863 | child_die(CHILD_ERR_SILENT); | |
864 | child_die(CHILD_ERR_ENOENT); | |
fc1b56f0 | 865 | } else { |
79319b19 | 866 | child_die(CHILD_ERR_ERRNO); |
fc1b56f0 | 867 | } |
b1bf95bb | 868 | } |
45afb1ca | 869 | atfork_parent(&as); |
0ac77ec3 | 870 | if (cmd->pid < 0) |
fbcb0e06 | 871 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 | 872 | else if (cmd->clean_on_exit) |
ac2fbaa6 | 873 | mark_child_for_cleanup(cmd->pid, cmd); |
2b541bf8 JS |
874 | |
875 | /* | |
3967e25b | 876 | * Wait for child's exec. If the exec succeeds (or if fork() |
2b541bf8 | 877 | * failed), EOF is seen immediately by the parent. Otherwise, the |
79319b19 | 878 | * child process sends a child_err struct. |
2b541bf8 JS |
879 | * Note that use of this infrastructure is completely advisory, |
880 | * therefore, we keep error checks minimal. | |
881 | */ | |
882 | close(notify_pipe[1]); | |
79319b19 | 883 | if (xread(notify_pipe[0], &cerr, sizeof(cerr)) == sizeof(cerr)) { |
2b541bf8 | 884 | /* |
3967e25b | 885 | * At this point we know that fork() succeeded, but exec() |
2b541bf8 JS |
886 | * failed. Errors have been reported to our stderr. |
887 | */ | |
507d7804 | 888 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
79319b19 | 889 | child_err_spew(cmd, &cerr); |
2b541bf8 JS |
890 | failed_errno = errno; |
891 | cmd->pid = -1; | |
892 | } | |
893 | close(notify_pipe[0]); | |
3967e25b | 894 | |
db015a28 BW |
895 | if (null_fd >= 0) |
896 | close(null_fd); | |
c972bf4c | 897 | strvec_clear(&argv); |
ae25394b | 898 | free(childenv); |
2b541bf8 | 899 | } |
321fd823 JK |
900 | end_of_spawn: |
901 | ||
ba26f296 | 902 | #else |
0d30ad71 | 903 | { |
75301f90 | 904 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 905 | const char **sargv = cmd->argv; |
c972bf4c | 906 | struct strvec nargv = STRVEC_INIT; |
ba26f296 | 907 | |
75301f90 JS |
908 | if (cmd->no_stdin) |
909 | fhin = open("/dev/null", O_RDWR); | |
910 | else if (need_in) | |
911 | fhin = dup(fdin[0]); | |
912 | else if (cmd->in) | |
913 | fhin = dup(cmd->in); | |
914 | ||
915 | if (cmd->no_stderr) | |
916 | fherr = open("/dev/null", O_RDWR); | |
917 | else if (need_err) | |
918 | fherr = dup(fderr[1]); | |
76d44c8c JH |
919 | else if (cmd->err > 2) |
920 | fherr = dup(cmd->err); | |
75301f90 JS |
921 | |
922 | if (cmd->no_stdout) | |
923 | fhout = open("/dev/null", O_RDWR); | |
924 | else if (cmd->stdout_to_stderr) | |
925 | fhout = dup(fherr); | |
926 | else if (need_out) | |
927 | fhout = dup(fdout[1]); | |
928 | else if (cmd->out > 1) | |
929 | fhout = dup(cmd->out); | |
ba26f296 | 930 | |
5a50085c | 931 | if (cmd->git_cmd) |
20574f55 | 932 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 933 | else if (cmd->use_shell) |
20574f55 | 934 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 935 | |
77734da2 KB |
936 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
937 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 938 | failed_errno = errno; |
c024beb5 | 939 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 940 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 | 941 | if (cmd->clean_on_exit && cmd->pid >= 0) |
ac2fbaa6 | 942 | mark_child_for_cleanup(cmd->pid, cmd); |
ba26f296 | 943 | |
c972bf4c | 944 | strvec_clear(&nargv); |
108ac313 | 945 | cmd->argv = sargv; |
75301f90 JS |
946 | if (fhin != 0) |
947 | close(fhin); | |
948 | if (fhout != 1) | |
949 | close(fhout); | |
950 | if (fherr != 2) | |
951 | close(fherr); | |
0d30ad71 | 952 | } |
ba26f296 JS |
953 | #endif |
954 | ||
955 | if (cmd->pid < 0) { | |
ee4512ed JH |
956 | trace2_child_exit(cmd, -1); |
957 | ||
ba26f296 JS |
958 | if (need_in) |
959 | close_pair(fdin); | |
960 | else if (cmd->in) | |
961 | close(cmd->in); | |
962 | if (need_out) | |
963 | close_pair(fdout); | |
964 | else if (cmd->out) | |
965 | close(cmd->out); | |
966 | if (need_err) | |
967 | close_pair(fderr); | |
fc012c28 D |
968 | else if (cmd->err) |
969 | close(cmd->err); | |
2d71608e | 970 | child_process_clear(cmd); |
0ac77ec3 JS |
971 | errno = failed_errno; |
972 | return -1; | |
ba26f296 | 973 | } |
4919bf03 SP |
974 | |
975 | if (need_in) | |
976 | close(fdin[0]); | |
977 | else if (cmd->in) | |
978 | close(cmd->in); | |
979 | ||
f4bba25b SP |
980 | if (need_out) |
981 | close(fdout[1]); | |
c20181e3 | 982 | else if (cmd->out) |
f4bba25b SP |
983 | close(cmd->out); |
984 | ||
f3b33f1d JS |
985 | if (need_err) |
986 | close(fderr[1]); | |
4f41b611 SP |
987 | else if (cmd->err) |
988 | close(cmd->err); | |
f3b33f1d | 989 | |
ebcb5d16 SP |
990 | return 0; |
991 | } | |
992 | ||
2d22c208 JS |
993 | int finish_command(struct child_process *cmd) |
994 | { | |
507d7804 | 995 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
ee4512ed | 996 | trace2_child_exit(cmd, ret); |
2d71608e | 997 | child_process_clear(cmd); |
0d58fef5 | 998 | invalidate_lstat_cache(); |
c460c0ec | 999 | return ret; |
2d22c208 JS |
1000 | } |
1001 | ||
507d7804 TI |
1002 | int finish_command_in_signal(struct child_process *cmd) |
1003 | { | |
ee4512ed JH |
1004 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 1); |
1005 | trace2_child_exit(cmd, ret); | |
1006 | return ret; | |
507d7804 TI |
1007 | } |
1008 | ||
1009 | ||
ebcb5d16 SP |
1010 | int run_command(struct child_process *cmd) |
1011 | { | |
c29b3962 JK |
1012 | int code; |
1013 | ||
1014 | if (cmd->out < 0 || cmd->err < 0) | |
033abf97 | 1015 | BUG("run_command with a pipe can cause deadlock"); |
c29b3962 JK |
1016 | |
1017 | code = start_command(cmd); | |
ebcb5d16 SP |
1018 | if (code) |
1019 | return code; | |
1020 | return finish_command(cmd); | |
1021 | } | |
1022 | ||
f1000898 SP |
1023 | int run_command_v_opt(const char **argv, int opt) |
1024 | { | |
41e9bad7 | 1025 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
1026 | } |
1027 | ||
ee4512ed JH |
1028 | int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class) |
1029 | { | |
1030 | return run_command_v_opt_cd_env_tr2(argv, opt, NULL, NULL, tr2_class); | |
1031 | } | |
1032 | ||
ee493148 | 1033 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
ee4512ed JH |
1034 | { |
1035 | return run_command_v_opt_cd_env_tr2(argv, opt, dir, env, NULL); | |
1036 | } | |
1037 | ||
1038 | int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir, | |
1039 | const char *const *env, const char *tr2_class) | |
ee493148 | 1040 | { |
1f87293d RS |
1041 | struct child_process cmd = CHILD_PROCESS_INIT; |
1042 | cmd.argv = argv; | |
1043 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
1044 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
1045 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
1046 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
1047 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
1048 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
e662df7e | 1049 | cmd.wait_after_clean = opt & RUN_WAIT_AFTER_CLEAN ? 1 : 0; |
28d04e1e | 1050 | cmd.close_object_store = opt & RUN_CLOSE_OBJECT_STORE ? 1 : 0; |
ee493148 AR |
1051 | cmd.dir = dir; |
1052 | cmd.env = env; | |
ee4512ed | 1053 | cmd.trace2_child_class = tr2_class; |
ee493148 AR |
1054 | return run_command(&cmd); |
1055 | } | |
2d22c208 | 1056 | |
f6b60983 | 1057 | #ifndef NO_PTHREADS |
0ea1c89b JS |
1058 | static pthread_t main_thread; |
1059 | static int main_thread_set; | |
1060 | static pthread_key_t async_key; | |
1ece66bc | 1061 | static pthread_key_t async_die_counter; |
0ea1c89b | 1062 | |
200a76b7 | 1063 | static void *run_thread(void *data) |
618ebe9f JS |
1064 | { |
1065 | struct async *async = data; | |
f6b60983 | 1066 | intptr_t ret; |
0ea1c89b | 1067 | |
c792d7b6 JK |
1068 | if (async->isolate_sigpipe) { |
1069 | sigset_t mask; | |
1070 | sigemptyset(&mask); | |
1071 | sigaddset(&mask, SIGPIPE); | |
1072 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
1073 | ret = error("unable to block SIGPIPE in async thread"); | |
1074 | return (void *)ret; | |
1075 | } | |
1076 | } | |
1077 | ||
0ea1c89b | 1078 | pthread_setspecific(async_key, async); |
f6b60983 | 1079 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 1080 | return (void *)ret; |
618ebe9f | 1081 | } |
0ea1c89b JS |
1082 | |
1083 | static NORETURN void die_async(const char *err, va_list params) | |
1084 | { | |
1085 | vreportf("fatal: ", err, params); | |
1086 | ||
661a8cf4 | 1087 | if (in_async()) { |
0ea1c89b JS |
1088 | struct async *async = pthread_getspecific(async_key); |
1089 | if (async->proc_in >= 0) | |
1090 | close(async->proc_in); | |
1091 | if (async->proc_out >= 0) | |
1092 | close(async->proc_out); | |
1093 | pthread_exit((void *)128); | |
1094 | } | |
1095 | ||
1096 | exit(128); | |
618ebe9f | 1097 | } |
1ece66bc JK |
1098 | |
1099 | static int async_die_is_recursing(void) | |
1100 | { | |
1101 | void *ret = pthread_getspecific(async_die_counter); | |
1102 | pthread_setspecific(async_die_counter, (void *)1); | |
1103 | return ret != NULL; | |
1104 | } | |
1105 | ||
661a8cf4 JK |
1106 | int in_async(void) |
1107 | { | |
1108 | if (!main_thread_set) | |
1109 | return 0; /* no asyncs started yet */ | |
1110 | return !pthread_equal(main_thread, pthread_self()); | |
1111 | } | |
1112 | ||
b992fe10 | 1113 | static void NORETURN async_exit(int code) |
9658846c JK |
1114 | { |
1115 | pthread_exit((void *)(intptr_t)code); | |
1116 | } | |
1117 | ||
0f4b6db3 EB |
1118 | #else |
1119 | ||
1120 | static struct { | |
1121 | void (**handlers)(void); | |
1122 | size_t nr; | |
1123 | size_t alloc; | |
1124 | } git_atexit_hdlrs; | |
1125 | ||
1126 | static int git_atexit_installed; | |
1127 | ||
6066a7ea | 1128 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
1129 | { |
1130 | size_t i; | |
1131 | ||
1132 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
1133 | git_atexit_hdlrs.handlers[i-1](); | |
1134 | } | |
1135 | ||
6066a7ea | 1136 | static void git_atexit_clear(void) |
0f4b6db3 EB |
1137 | { |
1138 | free(git_atexit_hdlrs.handlers); | |
1139 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
1140 | git_atexit_installed = 0; | |
1141 | } | |
1142 | ||
1143 | #undef atexit | |
1144 | int git_atexit(void (*handler)(void)) | |
1145 | { | |
1146 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
1147 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
1148 | if (!git_atexit_installed) { | |
1149 | if (atexit(&git_atexit_dispatch)) | |
1150 | return -1; | |
1151 | git_atexit_installed = 1; | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | #define atexit git_atexit | |
1156 | ||
661a8cf4 JK |
1157 | static int process_is_async; |
1158 | int in_async(void) | |
1159 | { | |
1160 | return process_is_async; | |
1161 | } | |
1162 | ||
b992fe10 | 1163 | static void NORETURN async_exit(int code) |
9658846c JK |
1164 | { |
1165 | exit(code); | |
1166 | } | |
1167 | ||
618ebe9f JS |
1168 | #endif |
1169 | ||
b992fe10 LS |
1170 | void check_pipe(int err) |
1171 | { | |
1172 | if (err == EPIPE) { | |
1173 | if (in_async()) | |
1174 | async_exit(141); | |
1175 | ||
1176 | signal(SIGPIPE, SIG_DFL); | |
1177 | raise(SIGPIPE); | |
1178 | /* Should never happen, but just in case... */ | |
1179 | exit(141); | |
1180 | } | |
1181 | } | |
1182 | ||
2d22c208 JS |
1183 | int start_async(struct async *async) |
1184 | { | |
ae6a5609 EFL |
1185 | int need_in, need_out; |
1186 | int fdin[2], fdout[2]; | |
1187 | int proc_in, proc_out; | |
2d22c208 | 1188 | |
ae6a5609 EFL |
1189 | need_in = async->in < 0; |
1190 | if (need_in) { | |
1191 | if (pipe(fdin) < 0) { | |
1192 | if (async->out > 0) | |
1193 | close(async->out); | |
fbcb0e06 | 1194 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1195 | } |
1196 | async->in = fdin[1]; | |
1197 | } | |
1198 | ||
1199 | need_out = async->out < 0; | |
1200 | if (need_out) { | |
1201 | if (pipe(fdout) < 0) { | |
1202 | if (need_in) | |
1203 | close_pair(fdin); | |
1204 | else if (async->in) | |
1205 | close(async->in); | |
fbcb0e06 | 1206 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1207 | } |
1208 | async->out = fdout[0]; | |
1209 | } | |
1210 | ||
1211 | if (need_in) | |
1212 | proc_in = fdin[0]; | |
1213 | else if (async->in) | |
1214 | proc_in = async->in; | |
1215 | else | |
1216 | proc_in = -1; | |
1217 | ||
1218 | if (need_out) | |
1219 | proc_out = fdout[1]; | |
1220 | else if (async->out) | |
1221 | proc_out = async->out; | |
1222 | else | |
1223 | proc_out = -1; | |
2d22c208 | 1224 | |
f6b60983 | 1225 | #ifdef NO_PTHREADS |
2c3766f0 AM |
1226 | /* Flush stdio before fork() to avoid cloning buffers */ |
1227 | fflush(NULL); | |
1228 | ||
2d22c208 JS |
1229 | async->pid = fork(); |
1230 | if (async->pid < 0) { | |
fbcb0e06 | 1231 | error_errno("fork (async) failed"); |
ae6a5609 | 1232 | goto error; |
2d22c208 JS |
1233 | } |
1234 | if (!async->pid) { | |
ae6a5609 EFL |
1235 | if (need_in) |
1236 | close(fdin[1]); | |
1237 | if (need_out) | |
1238 | close(fdout[0]); | |
0f4b6db3 | 1239 | git_atexit_clear(); |
661a8cf4 | 1240 | process_is_async = 1; |
ae6a5609 | 1241 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 1242 | } |
ae6a5609 | 1243 | |
ac2fbaa6 | 1244 | mark_child_for_cleanup(async->pid, NULL); |
afe19ff7 | 1245 | |
ae6a5609 EFL |
1246 | if (need_in) |
1247 | close(fdin[0]); | |
1248 | else if (async->in) | |
1249 | close(async->in); | |
1250 | ||
1251 | if (need_out) | |
1252 | close(fdout[1]); | |
1253 | else if (async->out) | |
1254 | close(async->out); | |
618ebe9f | 1255 | #else |
0ea1c89b JS |
1256 | if (!main_thread_set) { |
1257 | /* | |
1258 | * We assume that the first time that start_async is called | |
1259 | * it is from the main thread. | |
1260 | */ | |
1261 | main_thread_set = 1; | |
1262 | main_thread = pthread_self(); | |
1263 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 1264 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 1265 | set_die_routine(die_async); |
1ece66bc | 1266 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
1267 | } |
1268 | ||
200a76b7 JS |
1269 | if (proc_in >= 0) |
1270 | set_cloexec(proc_in); | |
1271 | if (proc_out >= 0) | |
1272 | set_cloexec(proc_out); | |
ae6a5609 EFL |
1273 | async->proc_in = proc_in; |
1274 | async->proc_out = proc_out; | |
200a76b7 JS |
1275 | { |
1276 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
1277 | if (err) { | |
2179045f | 1278 | error(_("cannot create async thread: %s"), strerror(err)); |
200a76b7 JS |
1279 | goto error; |
1280 | } | |
618ebe9f JS |
1281 | } |
1282 | #endif | |
2d22c208 | 1283 | return 0; |
ae6a5609 EFL |
1284 | |
1285 | error: | |
1286 | if (need_in) | |
1287 | close_pair(fdin); | |
1288 | else if (async->in) | |
1289 | close(async->in); | |
1290 | ||
1291 | if (need_out) | |
1292 | close_pair(fdout); | |
1293 | else if (async->out) | |
1294 | close(async->out); | |
1295 | return -1; | |
2d22c208 JS |
1296 | } |
1297 | ||
1298 | int finish_async(struct async *async) | |
1299 | { | |
f6b60983 | 1300 | #ifdef NO_PTHREADS |
0d58fef5 JS |
1301 | int ret = wait_or_whine(async->pid, "child process", 0); |
1302 | ||
1303 | invalidate_lstat_cache(); | |
1304 | ||
1305 | return ret; | |
618ebe9f | 1306 | #else |
200a76b7 JS |
1307 | void *ret = (void *)(intptr_t)(-1); |
1308 | ||
1309 | if (pthread_join(async->tid, &ret)) | |
1310 | error("pthread_join failed"); | |
0d58fef5 | 1311 | invalidate_lstat_cache(); |
200a76b7 | 1312 | return (int)(intptr_t)ret; |
0d58fef5 | 1313 | |
618ebe9f | 1314 | #endif |
2d22c208 | 1315 | } |
ae98a008 | 1316 | |
c0e40a2d NTND |
1317 | int async_with_fork(void) |
1318 | { | |
1319 | #ifdef NO_PTHREADS | |
1320 | return 1; | |
1321 | #else | |
1322 | return 0; | |
1323 | #endif | |
1324 | } | |
1325 | ||
15048f8a | 1326 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 1327 | { |
d3180279 | 1328 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 1329 | const char *p; |
ae98a008 | 1330 | |
5a7da2dc AS |
1331 | p = find_hook(name); |
1332 | if (!p) | |
cf94ca8e SB |
1333 | return 0; |
1334 | ||
c972bf4c | 1335 | strvec_push(&hook.args, p); |
d1d09456 | 1336 | while ((p = va_arg(args, const char *))) |
c972bf4c | 1337 | strvec_push(&hook.args, p); |
15048f8a | 1338 | hook.env = env; |
ae98a008 SB |
1339 | hook.no_stdin = 1; |
1340 | hook.stdout_to_stderr = 1; | |
ee4512ed | 1341 | hook.trace2_hook_name = name; |
ae98a008 | 1342 | |
d1d09456 | 1343 | return run_command(&hook); |
ae98a008 | 1344 | } |
15048f8a BP |
1345 | |
1346 | int run_hook_le(const char *const *env, const char *name, ...) | |
1347 | { | |
1348 | va_list args; | |
1349 | int ret; | |
1350 | ||
1351 | va_start(args, name); | |
1352 | ret = run_hook_ve(env, name, args); | |
1353 | va_end(args); | |
1354 | ||
1355 | return ret; | |
1356 | } | |
911ec99b | 1357 | |
96335bcf JK |
1358 | struct io_pump { |
1359 | /* initialized by caller */ | |
1360 | int fd; | |
1361 | int type; /* POLLOUT or POLLIN */ | |
1362 | union { | |
1363 | struct { | |
1364 | const char *buf; | |
1365 | size_t len; | |
1366 | } out; | |
1367 | struct { | |
1368 | struct strbuf *buf; | |
1369 | size_t hint; | |
1370 | } in; | |
1371 | } u; | |
1372 | ||
1373 | /* returned by pump_io */ | |
1374 | int error; /* 0 for success, otherwise errno */ | |
1375 | ||
1376 | /* internal use */ | |
1377 | struct pollfd *pfd; | |
1378 | }; | |
1379 | ||
1380 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
1381 | { | |
1382 | int pollsize = 0; | |
1383 | int i; | |
1384 | ||
1385 | for (i = 0; i < nr; i++) { | |
1386 | struct io_pump *io = &slots[i]; | |
1387 | if (io->fd < 0) | |
1388 | continue; | |
1389 | pfd[pollsize].fd = io->fd; | |
1390 | pfd[pollsize].events = io->type; | |
1391 | io->pfd = &pfd[pollsize++]; | |
1392 | } | |
1393 | ||
1394 | if (!pollsize) | |
1395 | return 0; | |
1396 | ||
1397 | if (poll(pfd, pollsize, -1) < 0) { | |
1398 | if (errno == EINTR) | |
1399 | return 1; | |
1400 | die_errno("poll failed"); | |
1401 | } | |
1402 | ||
1403 | for (i = 0; i < nr; i++) { | |
1404 | struct io_pump *io = &slots[i]; | |
1405 | ||
1406 | if (io->fd < 0) | |
1407 | continue; | |
1408 | ||
1409 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
1410 | continue; | |
1411 | ||
1412 | if (io->type == POLLOUT) { | |
1413 | ssize_t len = xwrite(io->fd, | |
1414 | io->u.out.buf, io->u.out.len); | |
1415 | if (len < 0) { | |
1416 | io->error = errno; | |
1417 | close(io->fd); | |
1418 | io->fd = -1; | |
1419 | } else { | |
1420 | io->u.out.buf += len; | |
1421 | io->u.out.len -= len; | |
1422 | if (!io->u.out.len) { | |
1423 | close(io->fd); | |
1424 | io->fd = -1; | |
1425 | } | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | if (io->type == POLLIN) { | |
1430 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
1431 | io->fd, io->u.in.hint); | |
1432 | if (len < 0) | |
1433 | io->error = errno; | |
1434 | if (len <= 0) { | |
1435 | close(io->fd); | |
1436 | io->fd = -1; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | return 1; | |
1442 | } | |
1443 | ||
1444 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 1445 | { |
96335bcf JK |
1446 | struct pollfd *pfd; |
1447 | int i; | |
1448 | ||
1449 | for (i = 0; i < nr; i++) | |
1450 | slots[i].error = 0; | |
1451 | ||
1452 | ALLOC_ARRAY(pfd, nr); | |
1453 | while (pump_io_round(slots, nr, pfd)) | |
1454 | ; /* nothing */ | |
1455 | free(pfd); | |
1456 | ||
1457 | /* There may be multiple errno values, so just pick the first. */ | |
1458 | for (i = 0; i < nr; i++) { | |
1459 | if (slots[i].error) { | |
1460 | errno = slots[i].error; | |
1461 | return -1; | |
1462 | } | |
1463 | } | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | ||
1468 | int pipe_command(struct child_process *cmd, | |
1469 | const char *in, size_t in_len, | |
1470 | struct strbuf *out, size_t out_hint, | |
1471 | struct strbuf *err, size_t err_hint) | |
1472 | { | |
1473 | struct io_pump io[3]; | |
1474 | int nr = 0; | |
1475 | ||
1476 | if (in) | |
1477 | cmd->in = -1; | |
1478 | if (out) | |
1479 | cmd->out = -1; | |
1480 | if (err) | |
1481 | cmd->err = -1; | |
1482 | ||
911ec99b JK |
1483 | if (start_command(cmd) < 0) |
1484 | return -1; | |
1485 | ||
96335bcf JK |
1486 | if (in) { |
1487 | io[nr].fd = cmd->in; | |
1488 | io[nr].type = POLLOUT; | |
1489 | io[nr].u.out.buf = in; | |
1490 | io[nr].u.out.len = in_len; | |
1491 | nr++; | |
1492 | } | |
1493 | if (out) { | |
1494 | io[nr].fd = cmd->out; | |
1495 | io[nr].type = POLLIN; | |
1496 | io[nr].u.in.buf = out; | |
1497 | io[nr].u.in.hint = out_hint; | |
1498 | nr++; | |
1499 | } | |
1500 | if (err) { | |
1501 | io[nr].fd = cmd->err; | |
1502 | io[nr].type = POLLIN; | |
1503 | io[nr].u.in.buf = err; | |
1504 | io[nr].u.in.hint = err_hint; | |
1505 | nr++; | |
1506 | } | |
1507 | ||
1508 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1509 | finish_command(cmd); /* throw away exit code */ |
1510 | return -1; | |
1511 | } | |
1512 | ||
911ec99b JK |
1513 | return finish_command(cmd); |
1514 | } | |
c553c72e SB |
1515 | |
1516 | enum child_state { | |
1517 | GIT_CP_FREE, | |
1518 | GIT_CP_WORKING, | |
1519 | GIT_CP_WAIT_CLEANUP, | |
1520 | }; | |
1521 | ||
1522 | struct parallel_processes { | |
1523 | void *data; | |
1524 | ||
1525 | int max_processes; | |
1526 | int nr_processes; | |
1527 | ||
1528 | get_next_task_fn get_next_task; | |
1529 | start_failure_fn start_failure; | |
1530 | task_finished_fn task_finished; | |
1531 | ||
1532 | struct { | |
1533 | enum child_state state; | |
1534 | struct child_process process; | |
1535 | struct strbuf err; | |
1536 | void *data; | |
1537 | } *children; | |
1538 | /* | |
1539 | * The struct pollfd is logically part of *children, | |
1540 | * but the system call expects it as its own array. | |
1541 | */ | |
1542 | struct pollfd *pfd; | |
1543 | ||
1544 | unsigned shutdown : 1; | |
1545 | ||
1546 | int output_owner; | |
1547 | struct strbuf buffered_output; /* of finished children */ | |
1548 | }; | |
1549 | ||
aa710494 | 1550 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1551 | void *pp_cb, |
1552 | void *pp_task_cb) | |
1553 | { | |
c553c72e SB |
1554 | return 0; |
1555 | } | |
1556 | ||
1557 | static int default_task_finished(int result, | |
aa710494 | 1558 | struct strbuf *out, |
c553c72e SB |
1559 | void *pp_cb, |
1560 | void *pp_task_cb) | |
1561 | { | |
c553c72e SB |
1562 | return 0; |
1563 | } | |
1564 | ||
1565 | static void kill_children(struct parallel_processes *pp, int signo) | |
1566 | { | |
1567 | int i, n = pp->max_processes; | |
1568 | ||
1569 | for (i = 0; i < n; i++) | |
1570 | if (pp->children[i].state == GIT_CP_WORKING) | |
1571 | kill(pp->children[i].process.pid, signo); | |
1572 | } | |
1573 | ||
1574 | static struct parallel_processes *pp_for_signal; | |
1575 | ||
1576 | static void handle_children_on_signal(int signo) | |
1577 | { | |
1578 | kill_children(pp_for_signal, signo); | |
1579 | sigchain_pop(signo); | |
1580 | raise(signo); | |
1581 | } | |
1582 | ||
1583 | static void pp_init(struct parallel_processes *pp, | |
1584 | int n, | |
1585 | get_next_task_fn get_next_task, | |
1586 | start_failure_fn start_failure, | |
1587 | task_finished_fn task_finished, | |
1588 | void *data) | |
1589 | { | |
1590 | int i; | |
1591 | ||
1592 | if (n < 1) | |
1593 | n = online_cpus(); | |
1594 | ||
1595 | pp->max_processes = n; | |
1596 | ||
1597 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1598 | ||
1599 | pp->data = data; | |
1600 | if (!get_next_task) | |
033abf97 | 1601 | BUG("you need to specify a get_next_task function"); |
c553c72e SB |
1602 | pp->get_next_task = get_next_task; |
1603 | ||
1604 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1605 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1606 | ||
1607 | pp->nr_processes = 0; | |
1608 | pp->output_owner = 0; | |
1609 | pp->shutdown = 0; | |
ca56dadb RS |
1610 | CALLOC_ARRAY(pp->children, n); |
1611 | CALLOC_ARRAY(pp->pfd, n); | |
c553c72e SB |
1612 | strbuf_init(&pp->buffered_output, 0); |
1613 | ||
1614 | for (i = 0; i < n; i++) { | |
1615 | strbuf_init(&pp->children[i].err, 0); | |
1616 | child_process_init(&pp->children[i].process); | |
1617 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1618 | pp->pfd[i].fd = -1; | |
1619 | } | |
1620 | ||
1621 | pp_for_signal = pp; | |
1622 | sigchain_push_common(handle_children_on_signal); | |
1623 | } | |
1624 | ||
1625 | static void pp_cleanup(struct parallel_processes *pp) | |
1626 | { | |
1627 | int i; | |
1628 | ||
1629 | trace_printf("run_processes_parallel: done"); | |
1630 | for (i = 0; i < pp->max_processes; i++) { | |
1631 | strbuf_release(&pp->children[i].err); | |
1632 | child_process_clear(&pp->children[i].process); | |
1633 | } | |
1634 | ||
1635 | free(pp->children); | |
1636 | free(pp->pfd); | |
1637 | ||
1638 | /* | |
1639 | * When get_next_task added messages to the buffer in its last | |
1640 | * iteration, the buffered output is non empty. | |
1641 | */ | |
2dac9b56 | 1642 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1643 | strbuf_release(&pp->buffered_output); |
1644 | ||
1645 | sigchain_pop_common(); | |
1646 | } | |
1647 | ||
1648 | /* returns | |
1649 | * 0 if a new task was started. | |
1650 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1651 | * problem with starting a new command) | |
1652 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1653 | * to signal the children. | |
1654 | */ | |
1655 | static int pp_start_one(struct parallel_processes *pp) | |
1656 | { | |
1657 | int i, code; | |
1658 | ||
1659 | for (i = 0; i < pp->max_processes; i++) | |
1660 | if (pp->children[i].state == GIT_CP_FREE) | |
1661 | break; | |
1662 | if (i == pp->max_processes) | |
033abf97 | 1663 | BUG("bookkeeping is hard"); |
c553c72e SB |
1664 | |
1665 | code = pp->get_next_task(&pp->children[i].process, | |
1666 | &pp->children[i].err, | |
1667 | pp->data, | |
1668 | &pp->children[i].data); | |
1669 | if (!code) { | |
1670 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1671 | strbuf_reset(&pp->children[i].err); | |
1672 | return 1; | |
1673 | } | |
1674 | pp->children[i].process.err = -1; | |
1675 | pp->children[i].process.stdout_to_stderr = 1; | |
1676 | pp->children[i].process.no_stdin = 1; | |
1677 | ||
1678 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1679 | code = pp->start_failure(&pp->children[i].err, |
c553c72e | 1680 | pp->data, |
c1e860f1 | 1681 | pp->children[i].data); |
c553c72e SB |
1682 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); |
1683 | strbuf_reset(&pp->children[i].err); | |
1684 | if (code) | |
1685 | pp->shutdown = 1; | |
1686 | return code; | |
1687 | } | |
1688 | ||
1689 | pp->nr_processes++; | |
1690 | pp->children[i].state = GIT_CP_WORKING; | |
1691 | pp->pfd[i].fd = pp->children[i].process.err; | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1696 | { | |
1697 | int i; | |
1698 | ||
1699 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1700 | if (errno == EINTR) | |
1701 | continue; | |
1702 | pp_cleanup(pp); | |
1703 | die_errno("poll"); | |
1704 | } | |
1705 | ||
1706 | /* Buffer output from all pipes. */ | |
1707 | for (i = 0; i < pp->max_processes; i++) { | |
1708 | if (pp->children[i].state == GIT_CP_WORKING && | |
1709 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1710 | int n = strbuf_read_once(&pp->children[i].err, | |
1711 | pp->children[i].process.err, 0); | |
1712 | if (n == 0) { | |
1713 | close(pp->children[i].process.err); | |
1714 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1715 | } else if (n < 0) | |
1716 | if (errno != EAGAIN) | |
1717 | die_errno("read"); | |
1718 | } | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | static void pp_output(struct parallel_processes *pp) | |
1723 | { | |
1724 | int i = pp->output_owner; | |
1725 | if (pp->children[i].state == GIT_CP_WORKING && | |
1726 | pp->children[i].err.len) { | |
2dac9b56 | 1727 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1728 | strbuf_reset(&pp->children[i].err); |
1729 | } | |
1730 | } | |
1731 | ||
1732 | static int pp_collect_finished(struct parallel_processes *pp) | |
1733 | { | |
1734 | int i, code; | |
1735 | int n = pp->max_processes; | |
1736 | int result = 0; | |
1737 | ||
1738 | while (pp->nr_processes > 0) { | |
1739 | for (i = 0; i < pp->max_processes; i++) | |
1740 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1741 | break; | |
1742 | if (i == pp->max_processes) | |
1743 | break; | |
1744 | ||
1745 | code = finish_command(&pp->children[i].process); | |
1746 | ||
2a73b3da | 1747 | code = pp->task_finished(code, |
c553c72e | 1748 | &pp->children[i].err, pp->data, |
c1e860f1 | 1749 | pp->children[i].data); |
c553c72e SB |
1750 | |
1751 | if (code) | |
1752 | result = code; | |
1753 | if (code < 0) | |
1754 | break; | |
1755 | ||
1756 | pp->nr_processes--; | |
1757 | pp->children[i].state = GIT_CP_FREE; | |
1758 | pp->pfd[i].fd = -1; | |
1759 | child_process_init(&pp->children[i].process); | |
1760 | ||
1761 | if (i != pp->output_owner) { | |
1762 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1763 | strbuf_reset(&pp->children[i].err); | |
1764 | } else { | |
2dac9b56 | 1765 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1766 | strbuf_reset(&pp->children[i].err); |
1767 | ||
1768 | /* Output all other finished child processes */ | |
2dac9b56 | 1769 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1770 | strbuf_reset(&pp->buffered_output); |
1771 | ||
1772 | /* | |
1773 | * Pick next process to output live. | |
1774 | * NEEDSWORK: | |
1775 | * For now we pick it randomly by doing a round | |
1776 | * robin. Later we may want to pick the one with | |
1777 | * the most output or the longest or shortest | |
1778 | * running process time. | |
1779 | */ | |
1780 | for (i = 0; i < n; i++) | |
1781 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1782 | break; | |
1783 | pp->output_owner = (pp->output_owner + i) % n; | |
1784 | } | |
1785 | } | |
1786 | return result; | |
1787 | } | |
1788 | ||
1789 | int run_processes_parallel(int n, | |
1790 | get_next_task_fn get_next_task, | |
1791 | start_failure_fn start_failure, | |
1792 | task_finished_fn task_finished, | |
1793 | void *pp_cb) | |
1794 | { | |
1795 | int i, code; | |
1796 | int output_timeout = 100; | |
1797 | int spawn_cap = 4; | |
1798 | struct parallel_processes pp; | |
1799 | ||
1800 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1801 | while (1) { | |
1802 | for (i = 0; | |
1803 | i < spawn_cap && !pp.shutdown && | |
1804 | pp.nr_processes < pp.max_processes; | |
1805 | i++) { | |
1806 | code = pp_start_one(&pp); | |
1807 | if (!code) | |
1808 | continue; | |
1809 | if (code < 0) { | |
1810 | pp.shutdown = 1; | |
1811 | kill_children(&pp, -code); | |
1812 | } | |
1813 | break; | |
1814 | } | |
1815 | if (!pp.nr_processes) | |
1816 | break; | |
1817 | pp_buffer_stderr(&pp, output_timeout); | |
1818 | pp_output(&pp); | |
1819 | code = pp_collect_finished(&pp); | |
1820 | if (code) { | |
1821 | pp.shutdown = 1; | |
1822 | if (code < 0) | |
1823 | kill_children(&pp, -code); | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | pp_cleanup(&pp); | |
1828 | return 0; | |
1829 | } | |
ee4512ed JH |
1830 | |
1831 | int run_processes_parallel_tr2(int n, get_next_task_fn get_next_task, | |
1832 | start_failure_fn start_failure, | |
1833 | task_finished_fn task_finished, void *pp_cb, | |
1834 | const char *tr2_category, const char *tr2_label) | |
1835 | { | |
1836 | int result; | |
1837 | ||
1838 | trace2_region_enter_printf(tr2_category, tr2_label, NULL, "max:%d", | |
1839 | ((n < 1) ? online_cpus() : n)); | |
1840 | ||
1841 | result = run_processes_parallel(n, get_next_task, start_failure, | |
1842 | task_finished, pp_cb); | |
1843 | ||
1844 | trace2_region_leave(tr2_category, tr2_label, NULL); | |
1845 | ||
1846 | return result; | |
1847 | } | |
850b6ede | 1848 | |
a95ce124 | 1849 | int run_auto_maintenance(int quiet) |
850b6ede | 1850 | { |
1942d483 | 1851 | int enabled; |
a95ce124 | 1852 | struct child_process maint = CHILD_PROCESS_INIT; |
850b6ede | 1853 | |
1942d483 DS |
1854 | if (!git_config_get_bool("maintenance.auto", &enabled) && |
1855 | !enabled) | |
1856 | return 0; | |
1857 | ||
a95ce124 | 1858 | maint.git_cmd = 1; |
5a22a334 | 1859 | maint.close_object_store = 1; |
a95ce124 DS |
1860 | strvec_pushl(&maint.args, "maintenance", "run", "--auto", NULL); |
1861 | strvec_push(&maint.args, quiet ? "--quiet" : "--no-quiet"); | |
1862 | ||
1863 | return run_command(&maint); | |
850b6ede | 1864 | } |
d1fa9435 JT |
1865 | |
1866 | void prepare_other_repo_env(struct strvec *env_array, const char *new_git_dir) | |
1867 | { | |
1868 | const char * const *var; | |
1869 | ||
1870 | for (var = local_repo_env; *var; var++) { | |
1871 | if (strcmp(*var, CONFIG_DATA_ENVIRONMENT) && | |
1872 | strcmp(*var, CONFIG_COUNT_ENVIRONMENT)) | |
1873 | strvec_push(env_array, *var); | |
1874 | } | |
1875 | strvec_pushf(env_array, "%s=%s", GIT_DIR_ENVIRONMENT, new_git_dir); | |
1876 | } | |
fdb13226 JH |
1877 | |
1878 | enum start_bg_result start_bg_command(struct child_process *cmd, | |
1879 | start_bg_wait_cb *wait_cb, | |
1880 | void *cb_data, | |
1881 | unsigned int timeout_sec) | |
1882 | { | |
1883 | enum start_bg_result sbgr = SBGR_ERROR; | |
1884 | int ret; | |
1885 | int wait_status; | |
1886 | pid_t pid_seen; | |
1887 | time_t time_limit; | |
1888 | ||
1889 | /* | |
1890 | * We do not allow clean-on-exit because the child process | |
1891 | * should persist in the background and possibly/probably | |
1892 | * after this process exits. So we don't want to kill the | |
1893 | * child during our atexit routine. | |
1894 | */ | |
1895 | if (cmd->clean_on_exit) | |
1896 | BUG("start_bg_command() does not allow non-zero clean_on_exit"); | |
1897 | ||
1898 | if (!cmd->trace2_child_class) | |
1899 | cmd->trace2_child_class = "background"; | |
1900 | ||
1901 | ret = start_command(cmd); | |
1902 | if (ret) { | |
1903 | /* | |
1904 | * We assume that if `start_command()` fails, we | |
1905 | * either get a complete `trace2_child_start() / | |
1906 | * trace2_child_exit()` pair or it fails before the | |
1907 | * `trace2_child_start()` is emitted, so we do not | |
1908 | * need to worry about it here. | |
1909 | * | |
1910 | * We also assume that `start_command()` does not add | |
1911 | * us to the cleanup list. And that it calls | |
1912 | * calls `child_process_clear()`. | |
1913 | */ | |
1914 | sbgr = SBGR_ERROR; | |
1915 | goto done; | |
1916 | } | |
1917 | ||
1918 | time(&time_limit); | |
1919 | time_limit += timeout_sec; | |
1920 | ||
1921 | wait: | |
1922 | pid_seen = waitpid(cmd->pid, &wait_status, WNOHANG); | |
1923 | ||
1924 | if (!pid_seen) { | |
1925 | /* | |
1926 | * The child is currently running. Ask the callback | |
1927 | * if the child is ready to do work or whether we | |
1928 | * should keep waiting for it to boot up. | |
1929 | */ | |
1930 | ret = (*wait_cb)(cmd, cb_data); | |
1931 | if (!ret) { | |
1932 | /* | |
1933 | * The child is running and "ready". | |
1934 | */ | |
1935 | trace2_child_ready(cmd, "ready"); | |
1936 | sbgr = SBGR_READY; | |
1937 | goto done; | |
1938 | } else if (ret > 0) { | |
1939 | /* | |
1940 | * The callback said to give it more time to boot up | |
1941 | * (subject to our timeout limit). | |
1942 | */ | |
1943 | time_t now; | |
1944 | ||
1945 | time(&now); | |
1946 | if (now < time_limit) | |
1947 | goto wait; | |
1948 | ||
1949 | /* | |
1950 | * Our timeout has expired. We don't try to | |
1951 | * kill the child, but rather let it continue | |
1952 | * (hopefully) trying to startup. | |
1953 | */ | |
1954 | trace2_child_ready(cmd, "timeout"); | |
1955 | sbgr = SBGR_TIMEOUT; | |
1956 | goto done; | |
1957 | } else { | |
1958 | /* | |
1959 | * The cb gave up on this child. It is still running, | |
1960 | * but our cb got an error trying to probe it. | |
1961 | */ | |
1962 | trace2_child_ready(cmd, "error"); | |
1963 | sbgr = SBGR_CB_ERROR; | |
1964 | goto done; | |
1965 | } | |
1966 | } | |
1967 | ||
1968 | else if (pid_seen == cmd->pid) { | |
1969 | int child_code = -1; | |
1970 | ||
1971 | /* | |
1972 | * The child started, but exited or was terminated | |
1973 | * before becoming "ready". | |
1974 | * | |
1975 | * We try to match the behavior of `wait_or_whine()` | |
1976 | * WRT the handling of WIFSIGNALED() and WIFEXITED() | |
1977 | * and convert the child's status to a return code for | |
1978 | * tracing purposes and emit the `trace2_child_exit()` | |
1979 | * event. | |
1980 | * | |
1981 | * We do not want the wait_or_whine() error message | |
1982 | * because we will be called by client-side library | |
1983 | * routines. | |
1984 | */ | |
1985 | if (WIFEXITED(wait_status)) | |
1986 | child_code = WEXITSTATUS(wait_status); | |
1987 | else if (WIFSIGNALED(wait_status)) | |
1988 | child_code = WTERMSIG(wait_status) + 128; | |
1989 | trace2_child_exit(cmd, child_code); | |
1990 | ||
1991 | sbgr = SBGR_DIED; | |
1992 | goto done; | |
1993 | } | |
1994 | ||
1995 | else if (pid_seen < 0 && errno == EINTR) | |
1996 | goto wait; | |
1997 | ||
1998 | trace2_child_exit(cmd, -1); | |
1999 | sbgr = SBGR_ERROR; | |
2000 | ||
2001 | done: | |
2002 | child_process_clear(cmd); | |
2003 | invalidate_lstat_cache(); | |
2004 | return sbgr; | |
2005 | } |