]>
Commit | Line | Data |
---|---|---|
b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
afe19ff7 | 4 | #include "sigchain.h" |
5d40a179 | 5 | #include "argv-array.h" |
c553c72e SB |
6 | #include "thread-utils.h" |
7 | #include "strbuf.h" | |
f805a00a | 8 | #include "string-list.h" |
e73dd786 | 9 | #include "quote.h" |
b1bf95bb | 10 | |
483bbd4e RS |
11 | void child_process_init(struct child_process *child) |
12 | { | |
13 | memset(child, 0, sizeof(*child)); | |
14 | argv_array_init(&child->args); | |
19a583dc | 15 | argv_array_init(&child->env_array); |
483bbd4e RS |
16 | } |
17 | ||
2d71608e RS |
18 | void child_process_clear(struct child_process *child) |
19 | { | |
20 | argv_array_clear(&child->args); | |
21 | argv_array_clear(&child->env_array); | |
22 | } | |
23 | ||
afe19ff7 JK |
24 | struct child_to_clean { |
25 | pid_t pid; | |
ac2fbaa6 | 26 | struct child_process *process; |
afe19ff7 JK |
27 | struct child_to_clean *next; |
28 | }; | |
29 | static struct child_to_clean *children_to_clean; | |
30 | static int installed_child_cleanup_handler; | |
31 | ||
507d7804 | 32 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 | 33 | { |
46df6906 JK |
34 | struct child_to_clean *children_to_wait_for = NULL; |
35 | ||
afe19ff7 JK |
36 | while (children_to_clean) { |
37 | struct child_to_clean *p = children_to_clean; | |
38 | children_to_clean = p->next; | |
ac2fbaa6 LS |
39 | |
40 | if (p->process && !in_signal) { | |
41 | struct child_process *process = p->process; | |
42 | if (process->clean_on_exit_handler) { | |
43 | trace_printf( | |
44 | "trace: run_command: running exit handler for pid %" | |
45 | PRIuMAX, (uintmax_t)p->pid | |
46 | ); | |
47 | process->clean_on_exit_handler(process); | |
48 | } | |
49 | } | |
50 | ||
afe19ff7 | 51 | kill(p->pid, sig); |
46df6906 | 52 | |
7b91929b | 53 | if (p->process && p->process->wait_after_clean) { |
46df6906 JK |
54 | p->next = children_to_wait_for; |
55 | children_to_wait_for = p; | |
56 | } else { | |
57 | if (!in_signal) | |
58 | free(p); | |
59 | } | |
60 | } | |
61 | ||
62 | while (children_to_wait_for) { | |
63 | struct child_to_clean *p = children_to_wait_for; | |
64 | children_to_wait_for = p->next; | |
65 | ||
66 | while (waitpid(p->pid, NULL, 0) < 0 && errno == EINTR) | |
67 | ; /* spin waiting for process exit or error */ | |
68 | ||
507d7804 TI |
69 | if (!in_signal) |
70 | free(p); | |
afe19ff7 JK |
71 | } |
72 | } | |
73 | ||
74 | static void cleanup_children_on_signal(int sig) | |
75 | { | |
507d7804 | 76 | cleanup_children(sig, 1); |
afe19ff7 JK |
77 | sigchain_pop(sig); |
78 | raise(sig); | |
79 | } | |
80 | ||
81 | static void cleanup_children_on_exit(void) | |
82 | { | |
507d7804 | 83 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
84 | } |
85 | ||
ac2fbaa6 | 86 | static void mark_child_for_cleanup(pid_t pid, struct child_process *process) |
afe19ff7 JK |
87 | { |
88 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
89 | p->pid = pid; | |
ac2fbaa6 | 90 | p->process = process; |
afe19ff7 JK |
91 | p->next = children_to_clean; |
92 | children_to_clean = p; | |
93 | ||
94 | if (!installed_child_cleanup_handler) { | |
95 | atexit(cleanup_children_on_exit); | |
96 | sigchain_push_common(cleanup_children_on_signal); | |
97 | installed_child_cleanup_handler = 1; | |
98 | } | |
99 | } | |
100 | ||
101 | static void clear_child_for_cleanup(pid_t pid) | |
102 | { | |
bdee397d | 103 | struct child_to_clean **pp; |
afe19ff7 | 104 | |
bdee397d DG |
105 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
106 | struct child_to_clean *clean_me = *pp; | |
107 | ||
108 | if (clean_me->pid == pid) { | |
109 | *pp = clean_me->next; | |
110 | free(clean_me); | |
afe19ff7 JK |
111 | return; |
112 | } | |
113 | } | |
114 | } | |
115 | ||
9dc09c76 SP |
116 | static inline void close_pair(int fd[2]) |
117 | { | |
118 | close(fd[0]); | |
119 | close(fd[1]); | |
120 | } | |
121 | ||
38124a40 BW |
122 | int is_executable(const char *name) |
123 | { | |
124 | struct stat st; | |
125 | ||
126 | if (stat(name, &st) || /* stat, not lstat */ | |
127 | !S_ISREG(st.st_mode)) | |
128 | return 0; | |
129 | ||
130 | #if defined(GIT_WINDOWS_NATIVE) | |
131 | /* | |
132 | * On Windows there is no executable bit. The file extension | |
133 | * indicates whether it can be run as an executable, and Git | |
134 | * has special-handling to detect scripts and launch them | |
135 | * through the indicated script interpreter. We test for the | |
136 | * file extension first because virus scanners may make | |
137 | * it quite expensive to open many files. | |
138 | */ | |
139 | if (ends_with(name, ".exe")) | |
140 | return S_IXUSR; | |
141 | ||
142 | { | |
143 | /* | |
144 | * Now that we know it does not have an executable extension, | |
145 | * peek into the file instead. | |
146 | */ | |
147 | char buf[3] = { 0 }; | |
148 | int n; | |
149 | int fd = open(name, O_RDONLY); | |
150 | st.st_mode &= ~S_IXUSR; | |
151 | if (fd >= 0) { | |
152 | n = read(fd, buf, 2); | |
153 | if (n == 2) | |
154 | /* look for a she-bang */ | |
155 | if (!strcmp(buf, "#!")) | |
156 | st.st_mode |= S_IXUSR; | |
157 | close(fd); | |
158 | } | |
159 | } | |
160 | #endif | |
161 | return st.st_mode & S_IXUSR; | |
162 | } | |
163 | ||
94028310 BW |
164 | /* |
165 | * Search $PATH for a command. This emulates the path search that | |
166 | * execvp would perform, without actually executing the command so it | |
167 | * can be used before fork() to prepare to run a command using | |
168 | * execve() or after execvp() to diagnose why it failed. | |
169 | * | |
170 | * The caller should ensure that file contains no directory | |
171 | * separators. | |
172 | * | |
173 | * Returns the path to the command, as found in $PATH or NULL if the | |
174 | * command could not be found. The caller inherits ownership of the memory | |
175 | * used to store the resultant path. | |
176 | * | |
177 | * This should not be used on Windows, where the $PATH search rules | |
178 | * are more complicated (e.g., a search for "foo" should find | |
179 | * "foo.exe"). | |
180 | */ | |
38f865c2 JK |
181 | static char *locate_in_PATH(const char *file) |
182 | { | |
183 | const char *p = getenv("PATH"); | |
184 | struct strbuf buf = STRBUF_INIT; | |
185 | ||
186 | if (!p || !*p) | |
187 | return NULL; | |
188 | ||
189 | while (1) { | |
190 | const char *end = strchrnul(p, ':'); | |
191 | ||
192 | strbuf_reset(&buf); | |
193 | ||
194 | /* POSIX specifies an empty entry as the current directory. */ | |
195 | if (end != p) { | |
196 | strbuf_add(&buf, p, end - p); | |
197 | strbuf_addch(&buf, '/'); | |
198 | } | |
199 | strbuf_addstr(&buf, file); | |
200 | ||
94028310 | 201 | if (is_executable(buf.buf)) |
38f865c2 JK |
202 | return strbuf_detach(&buf, NULL); |
203 | ||
204 | if (!*end) | |
205 | break; | |
206 | p = end + 1; | |
207 | } | |
208 | ||
209 | strbuf_release(&buf); | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | static int exists_in_PATH(const char *file) | |
214 | { | |
215 | char *r = locate_in_PATH(file); | |
216 | free(r); | |
217 | return r != NULL; | |
218 | } | |
219 | ||
220 | int sane_execvp(const char *file, char * const argv[]) | |
221 | { | |
222 | if (!execvp(file, argv)) | |
223 | return 0; /* cannot happen ;-) */ | |
224 | ||
225 | /* | |
226 | * When a command can't be found because one of the directories | |
227 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
228 | * careful usability testing (read: analysis of occasional bug | |
229 | * reports) reveals that "No such file or directory" is more | |
230 | * intuitive. | |
231 | * | |
232 | * We avoid commands with "/", because execvp will not do $PATH | |
233 | * lookups in that case. | |
234 | * | |
235 | * The reassignment of EACCES to errno looks like a no-op below, | |
236 | * but we need to protect against exists_in_PATH overwriting errno. | |
237 | */ | |
238 | if (errno == EACCES && !strchr(file, '/')) | |
239 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
240 | else if (errno == ENOTDIR && !strchr(file, '/')) |
241 | errno = ENOENT; | |
38f865c2 JK |
242 | return -1; |
243 | } | |
244 | ||
20574f55 | 245 | static const char **prepare_shell_cmd(struct argv_array *out, const char **argv) |
8dba1e63 | 246 | { |
20574f55 | 247 | if (!argv[0]) |
8dba1e63 JK |
248 | die("BUG: shell command is empty"); |
249 | ||
f445644f | 250 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 251 | #ifndef GIT_WINDOWS_NATIVE |
20574f55 | 252 | argv_array_push(out, SHELL_PATH); |
77629754 | 253 | #else |
20574f55 | 254 | argv_array_push(out, "sh"); |
77629754 | 255 | #endif |
20574f55 | 256 | argv_array_push(out, "-c"); |
8dba1e63 | 257 | |
20574f55 JK |
258 | /* |
259 | * If we have no extra arguments, we do not even need to | |
260 | * bother with the "$@" magic. | |
261 | */ | |
262 | if (!argv[1]) | |
263 | argv_array_push(out, argv[0]); | |
264 | else | |
265 | argv_array_pushf(out, "%s \"$@\"", argv[0]); | |
266 | } | |
8dba1e63 | 267 | |
20574f55 JK |
268 | argv_array_pushv(out, argv); |
269 | return out->argv; | |
8dba1e63 JK |
270 | } |
271 | ||
380395d0 | 272 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
273 | static int child_notifier = -1; |
274 | ||
79319b19 BW |
275 | enum child_errcode { |
276 | CHILD_ERR_CHDIR, | |
53fa6753 BW |
277 | CHILD_ERR_DUP2, |
278 | CHILD_ERR_CLOSE, | |
45afb1ca | 279 | CHILD_ERR_SIGPROCMASK, |
79319b19 BW |
280 | CHILD_ERR_ENOENT, |
281 | CHILD_ERR_SILENT, | |
282 | CHILD_ERR_ERRNO | |
283 | }; | |
284 | ||
285 | struct child_err { | |
286 | enum child_errcode err; | |
287 | int syserr; /* errno */ | |
288 | }; | |
289 | ||
290 | static void child_die(enum child_errcode err) | |
2b541bf8 | 291 | { |
79319b19 BW |
292 | struct child_err buf; |
293 | ||
294 | buf.err = err; | |
295 | buf.syserr = errno; | |
296 | ||
297 | /* write(2) on buf smaller than PIPE_BUF (min 512) is atomic: */ | |
298 | xwrite(child_notifier, &buf, sizeof(buf)); | |
299 | _exit(1); | |
300 | } | |
301 | ||
53fa6753 BW |
302 | static void child_dup2(int fd, int to) |
303 | { | |
304 | if (dup2(fd, to) < 0) | |
305 | child_die(CHILD_ERR_DUP2); | |
306 | } | |
307 | ||
308 | static void child_close(int fd) | |
309 | { | |
310 | if (close(fd)) | |
311 | child_die(CHILD_ERR_CLOSE); | |
312 | } | |
313 | ||
314 | static void child_close_pair(int fd[2]) | |
315 | { | |
316 | child_close(fd[0]); | |
317 | child_close(fd[1]); | |
318 | } | |
319 | ||
79319b19 BW |
320 | /* |
321 | * parent will make it look like the child spewed a fatal error and died | |
322 | * this is needed to prevent changes to t0061. | |
323 | */ | |
324 | static void fake_fatal(const char *err, va_list params) | |
325 | { | |
326 | vreportf("fatal: ", err, params); | |
327 | } | |
328 | ||
329 | static void child_error_fn(const char *err, va_list params) | |
330 | { | |
331 | const char msg[] = "error() should not be called in child\n"; | |
332 | xwrite(2, msg, sizeof(msg) - 1); | |
333 | } | |
334 | ||
335 | static void child_warn_fn(const char *err, va_list params) | |
336 | { | |
337 | const char msg[] = "warn() should not be called in child\n"; | |
338 | xwrite(2, msg, sizeof(msg) - 1); | |
339 | } | |
340 | ||
341 | static void NORETURN child_die_fn(const char *err, va_list params) | |
342 | { | |
343 | const char msg[] = "die() should not be called in child\n"; | |
344 | xwrite(2, msg, sizeof(msg) - 1); | |
345 | _exit(2); | |
346 | } | |
347 | ||
348 | /* this runs in the parent process */ | |
349 | static void child_err_spew(struct child_process *cmd, struct child_err *cerr) | |
350 | { | |
351 | static void (*old_errfn)(const char *err, va_list params); | |
352 | ||
353 | old_errfn = get_error_routine(); | |
354 | set_error_routine(fake_fatal); | |
355 | errno = cerr->syserr; | |
356 | ||
357 | switch (cerr->err) { | |
358 | case CHILD_ERR_CHDIR: | |
359 | error_errno("exec '%s': cd to '%s' failed", | |
360 | cmd->argv[0], cmd->dir); | |
361 | break; | |
53fa6753 BW |
362 | case CHILD_ERR_DUP2: |
363 | error_errno("dup2() in child failed"); | |
364 | break; | |
365 | case CHILD_ERR_CLOSE: | |
366 | error_errno("close() in child failed"); | |
367 | break; | |
45afb1ca EW |
368 | case CHILD_ERR_SIGPROCMASK: |
369 | error_errno("sigprocmask failed restoring signals"); | |
370 | break; | |
79319b19 BW |
371 | case CHILD_ERR_ENOENT: |
372 | error_errno("cannot run %s", cmd->argv[0]); | |
373 | break; | |
374 | case CHILD_ERR_SILENT: | |
375 | break; | |
376 | case CHILD_ERR_ERRNO: | |
377 | error_errno("cannot exec '%s'", cmd->argv[0]); | |
378 | break; | |
379 | } | |
380 | set_error_routine(old_errfn); | |
2b541bf8 | 381 | } |
3967e25b BW |
382 | |
383 | static void prepare_cmd(struct argv_array *out, const struct child_process *cmd) | |
384 | { | |
385 | if (!cmd->argv[0]) | |
386 | die("BUG: command is empty"); | |
387 | ||
e3a43446 BW |
388 | /* |
389 | * Add SHELL_PATH so in the event exec fails with ENOEXEC we can | |
390 | * attempt to interpret the command with 'sh'. | |
391 | */ | |
392 | argv_array_push(out, SHELL_PATH); | |
393 | ||
3967e25b BW |
394 | if (cmd->git_cmd) { |
395 | argv_array_push(out, "git"); | |
396 | argv_array_pushv(out, cmd->argv); | |
397 | } else if (cmd->use_shell) { | |
398 | prepare_shell_cmd(out, cmd->argv); | |
399 | } else { | |
400 | argv_array_pushv(out, cmd->argv); | |
401 | } | |
e3a43446 BW |
402 | |
403 | /* | |
404 | * If there are no '/' characters in the command then perform a path | |
405 | * lookup and use the resolved path as the command to exec. If there | |
406 | * are no '/' characters or if the command wasn't found in the path, | |
407 | * have exec attempt to invoke the command directly. | |
408 | */ | |
409 | if (!strchr(out->argv[1], '/')) { | |
410 | char *program = locate_in_PATH(out->argv[1]); | |
411 | if (program) { | |
412 | free((char *)out->argv[1]); | |
413 | out->argv[1] = program; | |
414 | } | |
415 | } | |
3967e25b | 416 | } |
ae25394b BW |
417 | |
418 | static char **prep_childenv(const char *const *deltaenv) | |
419 | { | |
420 | extern char **environ; | |
421 | char **childenv; | |
422 | struct string_list env = STRING_LIST_INIT_DUP; | |
423 | struct strbuf key = STRBUF_INIT; | |
424 | const char *const *p; | |
425 | int i; | |
426 | ||
427 | /* Construct a sorted string list consisting of the current environ */ | |
428 | for (p = (const char *const *) environ; p && *p; p++) { | |
429 | const char *equals = strchr(*p, '='); | |
430 | ||
431 | if (equals) { | |
432 | strbuf_reset(&key); | |
433 | strbuf_add(&key, *p, equals - *p); | |
434 | string_list_append(&env, key.buf)->util = (void *) *p; | |
435 | } else { | |
436 | string_list_append(&env, *p)->util = (void *) *p; | |
437 | } | |
438 | } | |
439 | string_list_sort(&env); | |
440 | ||
441 | /* Merge in 'deltaenv' with the current environ */ | |
442 | for (p = deltaenv; p && *p; p++) { | |
443 | const char *equals = strchr(*p, '='); | |
444 | ||
445 | if (equals) { | |
446 | /* ('key=value'), insert or replace entry */ | |
447 | strbuf_reset(&key); | |
448 | strbuf_add(&key, *p, equals - *p); | |
449 | string_list_insert(&env, key.buf)->util = (void *) *p; | |
450 | } else { | |
451 | /* otherwise ('key') remove existing entry */ | |
452 | string_list_remove(&env, *p, 0); | |
453 | } | |
454 | } | |
455 | ||
456 | /* Create an array of 'char *' to be used as the childenv */ | |
0e187d75 | 457 | ALLOC_ARRAY(childenv, env.nr + 1); |
ae25394b BW |
458 | for (i = 0; i < env.nr; i++) |
459 | childenv[i] = env.items[i].util; | |
460 | childenv[env.nr] = NULL; | |
461 | ||
462 | string_list_clear(&env, 0); | |
463 | strbuf_release(&key); | |
464 | return childenv; | |
465 | } | |
45afb1ca EW |
466 | |
467 | struct atfork_state { | |
468 | #ifndef NO_PTHREADS | |
469 | int cs; | |
470 | #endif | |
471 | sigset_t old; | |
472 | }; | |
473 | ||
474 | #ifndef NO_PTHREADS | |
475 | static void bug_die(int err, const char *msg) | |
476 | { | |
477 | if (err) { | |
478 | errno = err; | |
479 | die_errno("BUG: %s", msg); | |
480 | } | |
481 | } | |
482 | #endif | |
483 | ||
484 | static void atfork_prepare(struct atfork_state *as) | |
485 | { | |
486 | sigset_t all; | |
487 | ||
488 | if (sigfillset(&all)) | |
489 | die_errno("sigfillset"); | |
490 | #ifdef NO_PTHREADS | |
491 | if (sigprocmask(SIG_SETMASK, &all, &as->old)) | |
492 | die_errno("sigprocmask"); | |
493 | #else | |
494 | bug_die(pthread_sigmask(SIG_SETMASK, &all, &as->old), | |
495 | "blocking all signals"); | |
496 | bug_die(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs), | |
497 | "disabling cancellation"); | |
498 | #endif | |
499 | } | |
500 | ||
501 | static void atfork_parent(struct atfork_state *as) | |
502 | { | |
503 | #ifdef NO_PTHREADS | |
504 | if (sigprocmask(SIG_SETMASK, &as->old, NULL)) | |
505 | die_errno("sigprocmask"); | |
506 | #else | |
507 | bug_die(pthread_setcancelstate(as->cs, NULL), | |
508 | "re-enabling cancellation"); | |
509 | bug_die(pthread_sigmask(SIG_SETMASK, &as->old, NULL), | |
510 | "restoring signal mask"); | |
200a76b7 | 511 | #endif |
45afb1ca EW |
512 | } |
513 | #endif /* GIT_WINDOWS_NATIVE */ | |
a5487ddf JS |
514 | |
515 | static inline void set_cloexec(int fd) | |
516 | { | |
517 | int flags = fcntl(fd, F_GETFD); | |
518 | if (flags >= 0) | |
519 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
520 | } | |
a5487ddf | 521 | |
507d7804 | 522 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
523 | { |
524 | int status, code = -1; | |
525 | pid_t waiting; | |
526 | int failed_errno = 0; | |
527 | ||
528 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
529 | ; /* nothing */ | |
507d7804 TI |
530 | if (in_signal) |
531 | return 0; | |
ab0b41da JS |
532 | |
533 | if (waiting < 0) { | |
534 | failed_errno = errno; | |
fbcb0e06 | 535 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
536 | } else if (waiting != pid) { |
537 | error("waitpid is confused (%s)", argv0); | |
538 | } else if (WIFSIGNALED(status)) { | |
539 | code = WTERMSIG(status); | |
ac78663b | 540 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 541 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
542 | /* |
543 | * This return value is chosen so that code & 0xff | |
544 | * mimics the exit code that a POSIX shell would report for | |
545 | * a program that died from this signal. | |
546 | */ | |
709ca730 | 547 | code += 128; |
ab0b41da JS |
548 | } else if (WIFEXITED(status)) { |
549 | code = WEXITSTATUS(status); | |
ab0b41da JS |
550 | } else { |
551 | error("waitpid is confused (%s)", argv0); | |
552 | } | |
afe19ff7 JK |
553 | |
554 | clear_child_for_cleanup(pid); | |
555 | ||
ab0b41da JS |
556 | errno = failed_errno; |
557 | return code; | |
558 | } | |
559 | ||
c61a975d NTND |
560 | static void trace_add_env(struct strbuf *dst, const char *const *deltaenv) |
561 | { | |
562 | struct string_list envs = STRING_LIST_INIT_DUP; | |
563 | const char *const *e; | |
564 | int i; | |
565 | int printed_unset = 0; | |
566 | ||
567 | /* Last one wins, see run-command.c:prep_childenv() for context */ | |
568 | for (e = deltaenv; e && *e; e++) { | |
569 | struct strbuf key = STRBUF_INIT; | |
570 | char *equals = strchr(*e, '='); | |
571 | ||
572 | if (equals) { | |
573 | strbuf_add(&key, *e, equals - *e); | |
574 | string_list_insert(&envs, key.buf)->util = equals + 1; | |
575 | } else { | |
576 | string_list_insert(&envs, *e)->util = NULL; | |
577 | } | |
578 | strbuf_release(&key); | |
579 | } | |
580 | ||
581 | /* "unset X Y...;" */ | |
582 | for (i = 0; i < envs.nr; i++) { | |
583 | const char *var = envs.items[i].string; | |
584 | const char *val = envs.items[i].util; | |
585 | ||
586 | if (val || !getenv(var)) | |
587 | continue; | |
588 | ||
589 | if (!printed_unset) { | |
590 | strbuf_addstr(dst, " unset"); | |
591 | printed_unset = 1; | |
592 | } | |
593 | strbuf_addf(dst, " %s", var); | |
594 | } | |
595 | if (printed_unset) | |
596 | strbuf_addch(dst, ';'); | |
597 | ||
598 | /* ... followed by "A=B C=D ..." */ | |
599 | for (i = 0; i < envs.nr; i++) { | |
600 | const char *var = envs.items[i].string; | |
601 | const char *val = envs.items[i].util; | |
602 | const char *oldval; | |
603 | ||
604 | if (!val) | |
605 | continue; | |
606 | ||
607 | oldval = getenv(var); | |
608 | if (oldval && !strcmp(val, oldval)) | |
609 | continue; | |
610 | ||
611 | strbuf_addf(dst, " %s=", var); | |
612 | sq_quote_buf_pretty(dst, val); | |
613 | } | |
614 | string_list_clear(&envs, 0); | |
615 | } | |
616 | ||
e73dd786 NTND |
617 | static void trace_run_command(const struct child_process *cp) |
618 | { | |
619 | struct strbuf buf = STRBUF_INIT; | |
620 | ||
621 | if (!trace_want(&trace_default_key)) | |
622 | return; | |
623 | ||
248f66ed | 624 | strbuf_addstr(&buf, "trace: run_command:"); |
090a0927 NTND |
625 | if (cp->dir) { |
626 | strbuf_addstr(&buf, " cd "); | |
627 | sq_quote_buf_pretty(&buf, cp->dir); | |
628 | strbuf_addch(&buf, ';'); | |
629 | } | |
c61a975d NTND |
630 | /* |
631 | * The caller is responsible for initializing cp->env from | |
632 | * cp->env_array if needed. We only check one place. | |
633 | */ | |
634 | if (cp->env) | |
635 | trace_add_env(&buf, cp->env); | |
21dfc5e0 NTND |
636 | if (cp->git_cmd) |
637 | strbuf_addstr(&buf, " git"); | |
e73dd786 NTND |
638 | sq_quote_argv_pretty(&buf, cp->argv); |
639 | ||
640 | trace_printf("%s", buf.buf); | |
641 | strbuf_release(&buf); | |
642 | } | |
643 | ||
ebcb5d16 | 644 | int start_command(struct child_process *cmd) |
b1bf95bb | 645 | { |
f3b33f1d JS |
646 | int need_in, need_out, need_err; |
647 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 648 | int failed_errno; |
939296c4 | 649 | char *str; |
4919bf03 | 650 | |
c460c0ec JK |
651 | if (!cmd->argv) |
652 | cmd->argv = cmd->args.argv; | |
19a583dc RS |
653 | if (!cmd->env) |
654 | cmd->env = cmd->env_array.argv; | |
c460c0ec | 655 | |
c20181e3 JS |
656 | /* |
657 | * In case of errors we must keep the promise to close FDs | |
658 | * that have been passed in via ->in and ->out. | |
659 | */ | |
660 | ||
e4507ae8 | 661 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 662 | if (need_in) { |
c20181e3 | 663 | if (pipe(fdin) < 0) { |
0ac77ec3 | 664 | failed_errno = errno; |
c20181e3 JS |
665 | if (cmd->out > 0) |
666 | close(cmd->out); | |
939296c4 | 667 | str = "standard input"; |
0ac77ec3 | 668 | goto fail_pipe; |
c20181e3 | 669 | } |
4919bf03 | 670 | cmd->in = fdin[1]; |
4919bf03 SP |
671 | } |
672 | ||
e4507ae8 SP |
673 | need_out = !cmd->no_stdout |
674 | && !cmd->stdout_to_stderr | |
675 | && cmd->out < 0; | |
f4bba25b SP |
676 | if (need_out) { |
677 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 678 | failed_errno = errno; |
f4bba25b SP |
679 | if (need_in) |
680 | close_pair(fdin); | |
c20181e3 JS |
681 | else if (cmd->in) |
682 | close(cmd->in); | |
939296c4 | 683 | str = "standard output"; |
0ac77ec3 | 684 | goto fail_pipe; |
f4bba25b SP |
685 | } |
686 | cmd->out = fdout[0]; | |
f4bba25b SP |
687 | } |
688 | ||
b73a4397 | 689 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
690 | if (need_err) { |
691 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 692 | failed_errno = errno; |
f3b33f1d JS |
693 | if (need_in) |
694 | close_pair(fdin); | |
c20181e3 JS |
695 | else if (cmd->in) |
696 | close(cmd->in); | |
f3b33f1d JS |
697 | if (need_out) |
698 | close_pair(fdout); | |
c20181e3 JS |
699 | else if (cmd->out) |
700 | close(cmd->out); | |
939296c4 | 701 | str = "standard error"; |
0ac77ec3 | 702 | fail_pipe: |
939296c4 SB |
703 | error("cannot create %s pipe for %s: %s", |
704 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 705 | child_process_clear(cmd); |
0ac77ec3 JS |
706 | errno = failed_errno; |
707 | return -1; | |
f3b33f1d JS |
708 | } |
709 | cmd->err = fderr[0]; | |
710 | } | |
711 | ||
e73dd786 NTND |
712 | trace_run_command(cmd); |
713 | ||
13af8cbd | 714 | fflush(NULL); |
8852f5d7 | 715 | |
380395d0 | 716 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
717 | { |
718 | int notify_pipe[2]; | |
db015a28 | 719 | int null_fd = -1; |
ae25394b | 720 | char **childenv; |
3967e25b | 721 | struct argv_array argv = ARGV_ARRAY_INIT; |
79319b19 | 722 | struct child_err cerr; |
45afb1ca | 723 | struct atfork_state as; |
3967e25b | 724 | |
2b541bf8 JS |
725 | if (pipe(notify_pipe)) |
726 | notify_pipe[0] = notify_pipe[1] = -1; | |
727 | ||
db015a28 BW |
728 | if (cmd->no_stdin || cmd->no_stdout || cmd->no_stderr) { |
729 | null_fd = open("/dev/null", O_RDWR | O_CLOEXEC); | |
730 | if (null_fd < 0) | |
731 | die_errno(_("open /dev/null failed")); | |
732 | set_cloexec(null_fd); | |
733 | } | |
734 | ||
3967e25b | 735 | prepare_cmd(&argv, cmd); |
ae25394b | 736 | childenv = prep_childenv(cmd->env); |
45afb1ca | 737 | atfork_prepare(&as); |
3967e25b | 738 | |
e503cd6e BW |
739 | /* |
740 | * NOTE: In order to prevent deadlocking when using threads special | |
741 | * care should be taken with the function calls made in between the | |
742 | * fork() and exec() calls. No calls should be made to functions which | |
743 | * require acquiring a lock (e.g. malloc) as the lock could have been | |
744 | * held by another thread at the time of forking, causing the lock to | |
745 | * never be released in the child process. This means only | |
746 | * Async-Signal-Safe functions are permitted in the child. | |
747 | */ | |
ebcb5d16 | 748 | cmd->pid = fork(); |
25043d8a | 749 | failed_errno = errno; |
ebcb5d16 | 750 | if (!cmd->pid) { |
45afb1ca | 751 | int sig; |
a5487ddf | 752 | /* |
79319b19 BW |
753 | * Ensure the default die/error/warn routines do not get |
754 | * called, they can take stdio locks and malloc. | |
a5487ddf | 755 | */ |
79319b19 BW |
756 | set_die_routine(child_die_fn); |
757 | set_error_routine(child_error_fn); | |
758 | set_warn_routine(child_warn_fn); | |
a5487ddf | 759 | |
2b541bf8 JS |
760 | close(notify_pipe[0]); |
761 | set_cloexec(notify_pipe[1]); | |
762 | child_notifier = notify_pipe[1]; | |
2b541bf8 | 763 | |
e4507ae8 | 764 | if (cmd->no_stdin) |
53fa6753 | 765 | child_dup2(null_fd, 0); |
e4507ae8 | 766 | else if (need_in) { |
53fa6753 BW |
767 | child_dup2(fdin[0], 0); |
768 | child_close_pair(fdin); | |
4919bf03 | 769 | } else if (cmd->in) { |
53fa6753 BW |
770 | child_dup2(cmd->in, 0); |
771 | child_close(cmd->in); | |
95d3c4f5 | 772 | } |
4919bf03 | 773 | |
ce2cf27a | 774 | if (cmd->no_stderr) |
53fa6753 | 775 | child_dup2(null_fd, 2); |
ce2cf27a | 776 | else if (need_err) { |
53fa6753 BW |
777 | child_dup2(fderr[1], 2); |
778 | child_close_pair(fderr); | |
4f41b611 | 779 | } else if (cmd->err > 1) { |
53fa6753 BW |
780 | child_dup2(cmd->err, 2); |
781 | child_close(cmd->err); | |
ce2cf27a CC |
782 | } |
783 | ||
e4507ae8 | 784 | if (cmd->no_stdout) |
53fa6753 | 785 | child_dup2(null_fd, 1); |
e4507ae8 | 786 | else if (cmd->stdout_to_stderr) |
53fa6753 | 787 | child_dup2(2, 1); |
f4bba25b | 788 | else if (need_out) { |
53fa6753 BW |
789 | child_dup2(fdout[1], 1); |
790 | child_close_pair(fdout); | |
f4bba25b | 791 | } else if (cmd->out > 1) { |
53fa6753 BW |
792 | child_dup2(cmd->out, 1); |
793 | child_close(cmd->out); | |
f4bba25b SP |
794 | } |
795 | ||
1568fea0 | 796 | if (cmd->dir && chdir(cmd->dir)) |
79319b19 | 797 | child_die(CHILD_ERR_CHDIR); |
3967e25b | 798 | |
45afb1ca EW |
799 | /* |
800 | * restore default signal handlers here, in case | |
801 | * we catch a signal right before execve below | |
802 | */ | |
803 | for (sig = 1; sig < NSIG; sig++) { | |
804 | /* ignored signals get reset to SIG_DFL on execve */ | |
805 | if (signal(sig, SIG_DFL) == SIG_IGN) | |
806 | signal(sig, SIG_IGN); | |
807 | } | |
808 | ||
809 | if (sigprocmask(SIG_SETMASK, &as.old, NULL) != 0) | |
810 | child_die(CHILD_ERR_SIGPROCMASK); | |
811 | ||
e3a43446 BW |
812 | /* |
813 | * Attempt to exec using the command and arguments starting at | |
814 | * argv.argv[1]. argv.argv[0] contains SHELL_PATH which will | |
815 | * be used in the event exec failed with ENOEXEC at which point | |
816 | * we will try to interpret the command using 'sh'. | |
817 | */ | |
ae25394b BW |
818 | execve(argv.argv[1], (char *const *) argv.argv + 1, |
819 | (char *const *) childenv); | |
e3a43446 | 820 | if (errno == ENOEXEC) |
ae25394b BW |
821 | execve(argv.argv[0], (char *const *) argv.argv, |
822 | (char *const *) childenv); | |
3967e25b | 823 | |
fc1b56f0 | 824 | if (errno == ENOENT) { |
79319b19 BW |
825 | if (cmd->silent_exec_failure) |
826 | child_die(CHILD_ERR_SILENT); | |
827 | child_die(CHILD_ERR_ENOENT); | |
fc1b56f0 | 828 | } else { |
79319b19 | 829 | child_die(CHILD_ERR_ERRNO); |
fc1b56f0 | 830 | } |
b1bf95bb | 831 | } |
45afb1ca | 832 | atfork_parent(&as); |
0ac77ec3 | 833 | if (cmd->pid < 0) |
fbcb0e06 | 834 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 | 835 | else if (cmd->clean_on_exit) |
ac2fbaa6 | 836 | mark_child_for_cleanup(cmd->pid, cmd); |
2b541bf8 JS |
837 | |
838 | /* | |
3967e25b | 839 | * Wait for child's exec. If the exec succeeds (or if fork() |
2b541bf8 | 840 | * failed), EOF is seen immediately by the parent. Otherwise, the |
79319b19 | 841 | * child process sends a child_err struct. |
2b541bf8 JS |
842 | * Note that use of this infrastructure is completely advisory, |
843 | * therefore, we keep error checks minimal. | |
844 | */ | |
845 | close(notify_pipe[1]); | |
79319b19 | 846 | if (xread(notify_pipe[0], &cerr, sizeof(cerr)) == sizeof(cerr)) { |
2b541bf8 | 847 | /* |
3967e25b | 848 | * At this point we know that fork() succeeded, but exec() |
2b541bf8 JS |
849 | * failed. Errors have been reported to our stderr. |
850 | */ | |
507d7804 | 851 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
79319b19 | 852 | child_err_spew(cmd, &cerr); |
2b541bf8 JS |
853 | failed_errno = errno; |
854 | cmd->pid = -1; | |
855 | } | |
856 | close(notify_pipe[0]); | |
3967e25b | 857 | |
db015a28 BW |
858 | if (null_fd >= 0) |
859 | close(null_fd); | |
3967e25b | 860 | argv_array_clear(&argv); |
ae25394b | 861 | free(childenv); |
2b541bf8 | 862 | } |
ba26f296 | 863 | #else |
0d30ad71 | 864 | { |
75301f90 | 865 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 866 | const char **sargv = cmd->argv; |
20574f55 | 867 | struct argv_array nargv = ARGV_ARRAY_INIT; |
ba26f296 | 868 | |
75301f90 JS |
869 | if (cmd->no_stdin) |
870 | fhin = open("/dev/null", O_RDWR); | |
871 | else if (need_in) | |
872 | fhin = dup(fdin[0]); | |
873 | else if (cmd->in) | |
874 | fhin = dup(cmd->in); | |
875 | ||
876 | if (cmd->no_stderr) | |
877 | fherr = open("/dev/null", O_RDWR); | |
878 | else if (need_err) | |
879 | fherr = dup(fderr[1]); | |
76d44c8c JH |
880 | else if (cmd->err > 2) |
881 | fherr = dup(cmd->err); | |
75301f90 JS |
882 | |
883 | if (cmd->no_stdout) | |
884 | fhout = open("/dev/null", O_RDWR); | |
885 | else if (cmd->stdout_to_stderr) | |
886 | fhout = dup(fherr); | |
887 | else if (need_out) | |
888 | fhout = dup(fdout[1]); | |
889 | else if (cmd->out > 1) | |
890 | fhout = dup(cmd->out); | |
ba26f296 | 891 | |
5a50085c | 892 | if (cmd->git_cmd) |
20574f55 | 893 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 894 | else if (cmd->use_shell) |
20574f55 | 895 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 896 | |
77734da2 KB |
897 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
898 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 899 | failed_errno = errno; |
c024beb5 | 900 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 901 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 | 902 | if (cmd->clean_on_exit && cmd->pid >= 0) |
ac2fbaa6 | 903 | mark_child_for_cleanup(cmd->pid, cmd); |
ba26f296 | 904 | |
20574f55 | 905 | argv_array_clear(&nargv); |
108ac313 | 906 | cmd->argv = sargv; |
75301f90 JS |
907 | if (fhin != 0) |
908 | close(fhin); | |
909 | if (fhout != 1) | |
910 | close(fhout); | |
911 | if (fherr != 2) | |
912 | close(fherr); | |
0d30ad71 | 913 | } |
ba26f296 JS |
914 | #endif |
915 | ||
916 | if (cmd->pid < 0) { | |
917 | if (need_in) | |
918 | close_pair(fdin); | |
919 | else if (cmd->in) | |
920 | close(cmd->in); | |
921 | if (need_out) | |
922 | close_pair(fdout); | |
923 | else if (cmd->out) | |
924 | close(cmd->out); | |
925 | if (need_err) | |
926 | close_pair(fderr); | |
fc012c28 D |
927 | else if (cmd->err) |
928 | close(cmd->err); | |
2d71608e | 929 | child_process_clear(cmd); |
0ac77ec3 JS |
930 | errno = failed_errno; |
931 | return -1; | |
ba26f296 | 932 | } |
4919bf03 SP |
933 | |
934 | if (need_in) | |
935 | close(fdin[0]); | |
936 | else if (cmd->in) | |
937 | close(cmd->in); | |
938 | ||
f4bba25b SP |
939 | if (need_out) |
940 | close(fdout[1]); | |
c20181e3 | 941 | else if (cmd->out) |
f4bba25b SP |
942 | close(cmd->out); |
943 | ||
f3b33f1d JS |
944 | if (need_err) |
945 | close(fderr[1]); | |
4f41b611 SP |
946 | else if (cmd->err) |
947 | close(cmd->err); | |
f3b33f1d | 948 | |
ebcb5d16 SP |
949 | return 0; |
950 | } | |
951 | ||
2d22c208 JS |
952 | int finish_command(struct child_process *cmd) |
953 | { | |
507d7804 | 954 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2d71608e | 955 | child_process_clear(cmd); |
c460c0ec | 956 | return ret; |
2d22c208 JS |
957 | } |
958 | ||
507d7804 TI |
959 | int finish_command_in_signal(struct child_process *cmd) |
960 | { | |
961 | return wait_or_whine(cmd->pid, cmd->argv[0], 1); | |
962 | } | |
963 | ||
964 | ||
ebcb5d16 SP |
965 | int run_command(struct child_process *cmd) |
966 | { | |
c29b3962 JK |
967 | int code; |
968 | ||
969 | if (cmd->out < 0 || cmd->err < 0) | |
970 | die("BUG: run_command with a pipe can cause deadlock"); | |
971 | ||
972 | code = start_command(cmd); | |
ebcb5d16 SP |
973 | if (code) |
974 | return code; | |
975 | return finish_command(cmd); | |
976 | } | |
977 | ||
f1000898 SP |
978 | int run_command_v_opt(const char **argv, int opt) |
979 | { | |
41e9bad7 | 980 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
981 | } |
982 | ||
ee493148 AR |
983 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
984 | { | |
1f87293d RS |
985 | struct child_process cmd = CHILD_PROCESS_INIT; |
986 | cmd.argv = argv; | |
987 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
988 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
989 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
990 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
991 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
992 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
ee493148 AR |
993 | cmd.dir = dir; |
994 | cmd.env = env; | |
995 | return run_command(&cmd); | |
996 | } | |
2d22c208 | 997 | |
f6b60983 | 998 | #ifndef NO_PTHREADS |
0ea1c89b JS |
999 | static pthread_t main_thread; |
1000 | static int main_thread_set; | |
1001 | static pthread_key_t async_key; | |
1ece66bc | 1002 | static pthread_key_t async_die_counter; |
0ea1c89b | 1003 | |
200a76b7 | 1004 | static void *run_thread(void *data) |
618ebe9f JS |
1005 | { |
1006 | struct async *async = data; | |
f6b60983 | 1007 | intptr_t ret; |
0ea1c89b | 1008 | |
c792d7b6 JK |
1009 | if (async->isolate_sigpipe) { |
1010 | sigset_t mask; | |
1011 | sigemptyset(&mask); | |
1012 | sigaddset(&mask, SIGPIPE); | |
1013 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
1014 | ret = error("unable to block SIGPIPE in async thread"); | |
1015 | return (void *)ret; | |
1016 | } | |
1017 | } | |
1018 | ||
0ea1c89b | 1019 | pthread_setspecific(async_key, async); |
f6b60983 | 1020 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 1021 | return (void *)ret; |
618ebe9f | 1022 | } |
0ea1c89b JS |
1023 | |
1024 | static NORETURN void die_async(const char *err, va_list params) | |
1025 | { | |
1026 | vreportf("fatal: ", err, params); | |
1027 | ||
661a8cf4 | 1028 | if (in_async()) { |
0ea1c89b JS |
1029 | struct async *async = pthread_getspecific(async_key); |
1030 | if (async->proc_in >= 0) | |
1031 | close(async->proc_in); | |
1032 | if (async->proc_out >= 0) | |
1033 | close(async->proc_out); | |
1034 | pthread_exit((void *)128); | |
1035 | } | |
1036 | ||
1037 | exit(128); | |
618ebe9f | 1038 | } |
1ece66bc JK |
1039 | |
1040 | static int async_die_is_recursing(void) | |
1041 | { | |
1042 | void *ret = pthread_getspecific(async_die_counter); | |
1043 | pthread_setspecific(async_die_counter, (void *)1); | |
1044 | return ret != NULL; | |
1045 | } | |
1046 | ||
661a8cf4 JK |
1047 | int in_async(void) |
1048 | { | |
1049 | if (!main_thread_set) | |
1050 | return 0; /* no asyncs started yet */ | |
1051 | return !pthread_equal(main_thread, pthread_self()); | |
1052 | } | |
1053 | ||
b992fe10 | 1054 | static void NORETURN async_exit(int code) |
9658846c JK |
1055 | { |
1056 | pthread_exit((void *)(intptr_t)code); | |
1057 | } | |
1058 | ||
0f4b6db3 EB |
1059 | #else |
1060 | ||
1061 | static struct { | |
1062 | void (**handlers)(void); | |
1063 | size_t nr; | |
1064 | size_t alloc; | |
1065 | } git_atexit_hdlrs; | |
1066 | ||
1067 | static int git_atexit_installed; | |
1068 | ||
6066a7ea | 1069 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
1070 | { |
1071 | size_t i; | |
1072 | ||
1073 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
1074 | git_atexit_hdlrs.handlers[i-1](); | |
1075 | } | |
1076 | ||
6066a7ea | 1077 | static void git_atexit_clear(void) |
0f4b6db3 EB |
1078 | { |
1079 | free(git_atexit_hdlrs.handlers); | |
1080 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
1081 | git_atexit_installed = 0; | |
1082 | } | |
1083 | ||
1084 | #undef atexit | |
1085 | int git_atexit(void (*handler)(void)) | |
1086 | { | |
1087 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
1088 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
1089 | if (!git_atexit_installed) { | |
1090 | if (atexit(&git_atexit_dispatch)) | |
1091 | return -1; | |
1092 | git_atexit_installed = 1; | |
1093 | } | |
1094 | return 0; | |
1095 | } | |
1096 | #define atexit git_atexit | |
1097 | ||
661a8cf4 JK |
1098 | static int process_is_async; |
1099 | int in_async(void) | |
1100 | { | |
1101 | return process_is_async; | |
1102 | } | |
1103 | ||
b992fe10 | 1104 | static void NORETURN async_exit(int code) |
9658846c JK |
1105 | { |
1106 | exit(code); | |
1107 | } | |
1108 | ||
618ebe9f JS |
1109 | #endif |
1110 | ||
b992fe10 LS |
1111 | void check_pipe(int err) |
1112 | { | |
1113 | if (err == EPIPE) { | |
1114 | if (in_async()) | |
1115 | async_exit(141); | |
1116 | ||
1117 | signal(SIGPIPE, SIG_DFL); | |
1118 | raise(SIGPIPE); | |
1119 | /* Should never happen, but just in case... */ | |
1120 | exit(141); | |
1121 | } | |
1122 | } | |
1123 | ||
2d22c208 JS |
1124 | int start_async(struct async *async) |
1125 | { | |
ae6a5609 EFL |
1126 | int need_in, need_out; |
1127 | int fdin[2], fdout[2]; | |
1128 | int proc_in, proc_out; | |
2d22c208 | 1129 | |
ae6a5609 EFL |
1130 | need_in = async->in < 0; |
1131 | if (need_in) { | |
1132 | if (pipe(fdin) < 0) { | |
1133 | if (async->out > 0) | |
1134 | close(async->out); | |
fbcb0e06 | 1135 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1136 | } |
1137 | async->in = fdin[1]; | |
1138 | } | |
1139 | ||
1140 | need_out = async->out < 0; | |
1141 | if (need_out) { | |
1142 | if (pipe(fdout) < 0) { | |
1143 | if (need_in) | |
1144 | close_pair(fdin); | |
1145 | else if (async->in) | |
1146 | close(async->in); | |
fbcb0e06 | 1147 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
1148 | } |
1149 | async->out = fdout[0]; | |
1150 | } | |
1151 | ||
1152 | if (need_in) | |
1153 | proc_in = fdin[0]; | |
1154 | else if (async->in) | |
1155 | proc_in = async->in; | |
1156 | else | |
1157 | proc_in = -1; | |
1158 | ||
1159 | if (need_out) | |
1160 | proc_out = fdout[1]; | |
1161 | else if (async->out) | |
1162 | proc_out = async->out; | |
1163 | else | |
1164 | proc_out = -1; | |
2d22c208 | 1165 | |
f6b60983 | 1166 | #ifdef NO_PTHREADS |
2c3766f0 AM |
1167 | /* Flush stdio before fork() to avoid cloning buffers */ |
1168 | fflush(NULL); | |
1169 | ||
2d22c208 JS |
1170 | async->pid = fork(); |
1171 | if (async->pid < 0) { | |
fbcb0e06 | 1172 | error_errno("fork (async) failed"); |
ae6a5609 | 1173 | goto error; |
2d22c208 JS |
1174 | } |
1175 | if (!async->pid) { | |
ae6a5609 EFL |
1176 | if (need_in) |
1177 | close(fdin[1]); | |
1178 | if (need_out) | |
1179 | close(fdout[0]); | |
0f4b6db3 | 1180 | git_atexit_clear(); |
661a8cf4 | 1181 | process_is_async = 1; |
ae6a5609 | 1182 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 1183 | } |
ae6a5609 | 1184 | |
ac2fbaa6 | 1185 | mark_child_for_cleanup(async->pid, NULL); |
afe19ff7 | 1186 | |
ae6a5609 EFL |
1187 | if (need_in) |
1188 | close(fdin[0]); | |
1189 | else if (async->in) | |
1190 | close(async->in); | |
1191 | ||
1192 | if (need_out) | |
1193 | close(fdout[1]); | |
1194 | else if (async->out) | |
1195 | close(async->out); | |
618ebe9f | 1196 | #else |
0ea1c89b JS |
1197 | if (!main_thread_set) { |
1198 | /* | |
1199 | * We assume that the first time that start_async is called | |
1200 | * it is from the main thread. | |
1201 | */ | |
1202 | main_thread_set = 1; | |
1203 | main_thread = pthread_self(); | |
1204 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 1205 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 1206 | set_die_routine(die_async); |
1ece66bc | 1207 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
1208 | } |
1209 | ||
200a76b7 JS |
1210 | if (proc_in >= 0) |
1211 | set_cloexec(proc_in); | |
1212 | if (proc_out >= 0) | |
1213 | set_cloexec(proc_out); | |
ae6a5609 EFL |
1214 | async->proc_in = proc_in; |
1215 | async->proc_out = proc_out; | |
200a76b7 JS |
1216 | { |
1217 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
1218 | if (err) { | |
fbcb0e06 | 1219 | error_errno("cannot create thread"); |
200a76b7 JS |
1220 | goto error; |
1221 | } | |
618ebe9f JS |
1222 | } |
1223 | #endif | |
2d22c208 | 1224 | return 0; |
ae6a5609 EFL |
1225 | |
1226 | error: | |
1227 | if (need_in) | |
1228 | close_pair(fdin); | |
1229 | else if (async->in) | |
1230 | close(async->in); | |
1231 | ||
1232 | if (need_out) | |
1233 | close_pair(fdout); | |
1234 | else if (async->out) | |
1235 | close(async->out); | |
1236 | return -1; | |
2d22c208 JS |
1237 | } |
1238 | ||
1239 | int finish_async(struct async *async) | |
1240 | { | |
f6b60983 | 1241 | #ifdef NO_PTHREADS |
507d7804 | 1242 | return wait_or_whine(async->pid, "child process", 0); |
618ebe9f | 1243 | #else |
200a76b7 JS |
1244 | void *ret = (void *)(intptr_t)(-1); |
1245 | ||
1246 | if (pthread_join(async->tid, &ret)) | |
1247 | error("pthread_join failed"); | |
1248 | return (int)(intptr_t)ret; | |
618ebe9f | 1249 | #endif |
2d22c208 | 1250 | } |
ae98a008 | 1251 | |
dcf69262 | 1252 | const char *find_hook(const char *name) |
5a7da2dc | 1253 | { |
03f2c773 | 1254 | static struct strbuf path = STRBUF_INIT; |
5a7da2dc | 1255 | |
03f2c773 | 1256 | strbuf_reset(&path); |
9445b492 | 1257 | strbuf_git_path(&path, "hooks/%s", name); |
235be51f | 1258 | if (access(path.buf, X_OK) < 0) { |
f805a00a DM |
1259 | int err = errno; |
1260 | ||
235be51f JS |
1261 | #ifdef STRIP_EXTENSION |
1262 | strbuf_addstr(&path, STRIP_EXTENSION); | |
1263 | if (access(path.buf, X_OK) >= 0) | |
1264 | return path.buf; | |
f805a00a DM |
1265 | if (errno == EACCES) |
1266 | err = errno; | |
235be51f | 1267 | #endif |
f805a00a DM |
1268 | |
1269 | if (err == EACCES && advice_ignored_hook) { | |
1270 | static struct string_list advise_given = STRING_LIST_INIT_DUP; | |
1271 | ||
1272 | if (!string_list_lookup(&advise_given, name)) { | |
1273 | string_list_insert(&advise_given, name); | |
1274 | advise(_("The '%s' hook was ignored because " | |
1275 | "it's not set as executable.\n" | |
1276 | "You can disable this warning with " | |
1277 | "`git config advice.ignoredHook false`."), | |
1278 | path.buf); | |
1279 | } | |
1280 | } | |
03f2c773 | 1281 | return NULL; |
235be51f | 1282 | } |
03f2c773 | 1283 | return path.buf; |
5a7da2dc AS |
1284 | } |
1285 | ||
15048f8a | 1286 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 1287 | { |
d3180279 | 1288 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 1289 | const char *p; |
ae98a008 | 1290 | |
5a7da2dc AS |
1291 | p = find_hook(name); |
1292 | if (!p) | |
cf94ca8e SB |
1293 | return 0; |
1294 | ||
d1d09456 RS |
1295 | argv_array_push(&hook.args, p); |
1296 | while ((p = va_arg(args, const char *))) | |
1297 | argv_array_push(&hook.args, p); | |
15048f8a | 1298 | hook.env = env; |
ae98a008 SB |
1299 | hook.no_stdin = 1; |
1300 | hook.stdout_to_stderr = 1; | |
ae98a008 | 1301 | |
d1d09456 | 1302 | return run_command(&hook); |
ae98a008 | 1303 | } |
15048f8a BP |
1304 | |
1305 | int run_hook_le(const char *const *env, const char *name, ...) | |
1306 | { | |
1307 | va_list args; | |
1308 | int ret; | |
1309 | ||
1310 | va_start(args, name); | |
1311 | ret = run_hook_ve(env, name, args); | |
1312 | va_end(args); | |
1313 | ||
1314 | return ret; | |
1315 | } | |
911ec99b | 1316 | |
96335bcf JK |
1317 | struct io_pump { |
1318 | /* initialized by caller */ | |
1319 | int fd; | |
1320 | int type; /* POLLOUT or POLLIN */ | |
1321 | union { | |
1322 | struct { | |
1323 | const char *buf; | |
1324 | size_t len; | |
1325 | } out; | |
1326 | struct { | |
1327 | struct strbuf *buf; | |
1328 | size_t hint; | |
1329 | } in; | |
1330 | } u; | |
1331 | ||
1332 | /* returned by pump_io */ | |
1333 | int error; /* 0 for success, otherwise errno */ | |
1334 | ||
1335 | /* internal use */ | |
1336 | struct pollfd *pfd; | |
1337 | }; | |
1338 | ||
1339 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
1340 | { | |
1341 | int pollsize = 0; | |
1342 | int i; | |
1343 | ||
1344 | for (i = 0; i < nr; i++) { | |
1345 | struct io_pump *io = &slots[i]; | |
1346 | if (io->fd < 0) | |
1347 | continue; | |
1348 | pfd[pollsize].fd = io->fd; | |
1349 | pfd[pollsize].events = io->type; | |
1350 | io->pfd = &pfd[pollsize++]; | |
1351 | } | |
1352 | ||
1353 | if (!pollsize) | |
1354 | return 0; | |
1355 | ||
1356 | if (poll(pfd, pollsize, -1) < 0) { | |
1357 | if (errno == EINTR) | |
1358 | return 1; | |
1359 | die_errno("poll failed"); | |
1360 | } | |
1361 | ||
1362 | for (i = 0; i < nr; i++) { | |
1363 | struct io_pump *io = &slots[i]; | |
1364 | ||
1365 | if (io->fd < 0) | |
1366 | continue; | |
1367 | ||
1368 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
1369 | continue; | |
1370 | ||
1371 | if (io->type == POLLOUT) { | |
1372 | ssize_t len = xwrite(io->fd, | |
1373 | io->u.out.buf, io->u.out.len); | |
1374 | if (len < 0) { | |
1375 | io->error = errno; | |
1376 | close(io->fd); | |
1377 | io->fd = -1; | |
1378 | } else { | |
1379 | io->u.out.buf += len; | |
1380 | io->u.out.len -= len; | |
1381 | if (!io->u.out.len) { | |
1382 | close(io->fd); | |
1383 | io->fd = -1; | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | if (io->type == POLLIN) { | |
1389 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
1390 | io->fd, io->u.in.hint); | |
1391 | if (len < 0) | |
1392 | io->error = errno; | |
1393 | if (len <= 0) { | |
1394 | close(io->fd); | |
1395 | io->fd = -1; | |
1396 | } | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | return 1; | |
1401 | } | |
1402 | ||
1403 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 1404 | { |
96335bcf JK |
1405 | struct pollfd *pfd; |
1406 | int i; | |
1407 | ||
1408 | for (i = 0; i < nr; i++) | |
1409 | slots[i].error = 0; | |
1410 | ||
1411 | ALLOC_ARRAY(pfd, nr); | |
1412 | while (pump_io_round(slots, nr, pfd)) | |
1413 | ; /* nothing */ | |
1414 | free(pfd); | |
1415 | ||
1416 | /* There may be multiple errno values, so just pick the first. */ | |
1417 | for (i = 0; i < nr; i++) { | |
1418 | if (slots[i].error) { | |
1419 | errno = slots[i].error; | |
1420 | return -1; | |
1421 | } | |
1422 | } | |
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | ||
1427 | int pipe_command(struct child_process *cmd, | |
1428 | const char *in, size_t in_len, | |
1429 | struct strbuf *out, size_t out_hint, | |
1430 | struct strbuf *err, size_t err_hint) | |
1431 | { | |
1432 | struct io_pump io[3]; | |
1433 | int nr = 0; | |
1434 | ||
1435 | if (in) | |
1436 | cmd->in = -1; | |
1437 | if (out) | |
1438 | cmd->out = -1; | |
1439 | if (err) | |
1440 | cmd->err = -1; | |
1441 | ||
911ec99b JK |
1442 | if (start_command(cmd) < 0) |
1443 | return -1; | |
1444 | ||
96335bcf JK |
1445 | if (in) { |
1446 | io[nr].fd = cmd->in; | |
1447 | io[nr].type = POLLOUT; | |
1448 | io[nr].u.out.buf = in; | |
1449 | io[nr].u.out.len = in_len; | |
1450 | nr++; | |
1451 | } | |
1452 | if (out) { | |
1453 | io[nr].fd = cmd->out; | |
1454 | io[nr].type = POLLIN; | |
1455 | io[nr].u.in.buf = out; | |
1456 | io[nr].u.in.hint = out_hint; | |
1457 | nr++; | |
1458 | } | |
1459 | if (err) { | |
1460 | io[nr].fd = cmd->err; | |
1461 | io[nr].type = POLLIN; | |
1462 | io[nr].u.in.buf = err; | |
1463 | io[nr].u.in.hint = err_hint; | |
1464 | nr++; | |
1465 | } | |
1466 | ||
1467 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1468 | finish_command(cmd); /* throw away exit code */ |
1469 | return -1; | |
1470 | } | |
1471 | ||
911ec99b JK |
1472 | return finish_command(cmd); |
1473 | } | |
c553c72e SB |
1474 | |
1475 | enum child_state { | |
1476 | GIT_CP_FREE, | |
1477 | GIT_CP_WORKING, | |
1478 | GIT_CP_WAIT_CLEANUP, | |
1479 | }; | |
1480 | ||
1481 | struct parallel_processes { | |
1482 | void *data; | |
1483 | ||
1484 | int max_processes; | |
1485 | int nr_processes; | |
1486 | ||
1487 | get_next_task_fn get_next_task; | |
1488 | start_failure_fn start_failure; | |
1489 | task_finished_fn task_finished; | |
1490 | ||
1491 | struct { | |
1492 | enum child_state state; | |
1493 | struct child_process process; | |
1494 | struct strbuf err; | |
1495 | void *data; | |
1496 | } *children; | |
1497 | /* | |
1498 | * The struct pollfd is logically part of *children, | |
1499 | * but the system call expects it as its own array. | |
1500 | */ | |
1501 | struct pollfd *pfd; | |
1502 | ||
1503 | unsigned shutdown : 1; | |
1504 | ||
1505 | int output_owner; | |
1506 | struct strbuf buffered_output; /* of finished children */ | |
1507 | }; | |
1508 | ||
aa710494 | 1509 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1510 | void *pp_cb, |
1511 | void *pp_task_cb) | |
1512 | { | |
c553c72e SB |
1513 | return 0; |
1514 | } | |
1515 | ||
1516 | static int default_task_finished(int result, | |
aa710494 | 1517 | struct strbuf *out, |
c553c72e SB |
1518 | void *pp_cb, |
1519 | void *pp_task_cb) | |
1520 | { | |
c553c72e SB |
1521 | return 0; |
1522 | } | |
1523 | ||
1524 | static void kill_children(struct parallel_processes *pp, int signo) | |
1525 | { | |
1526 | int i, n = pp->max_processes; | |
1527 | ||
1528 | for (i = 0; i < n; i++) | |
1529 | if (pp->children[i].state == GIT_CP_WORKING) | |
1530 | kill(pp->children[i].process.pid, signo); | |
1531 | } | |
1532 | ||
1533 | static struct parallel_processes *pp_for_signal; | |
1534 | ||
1535 | static void handle_children_on_signal(int signo) | |
1536 | { | |
1537 | kill_children(pp_for_signal, signo); | |
1538 | sigchain_pop(signo); | |
1539 | raise(signo); | |
1540 | } | |
1541 | ||
1542 | static void pp_init(struct parallel_processes *pp, | |
1543 | int n, | |
1544 | get_next_task_fn get_next_task, | |
1545 | start_failure_fn start_failure, | |
1546 | task_finished_fn task_finished, | |
1547 | void *data) | |
1548 | { | |
1549 | int i; | |
1550 | ||
1551 | if (n < 1) | |
1552 | n = online_cpus(); | |
1553 | ||
1554 | pp->max_processes = n; | |
1555 | ||
1556 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1557 | ||
1558 | pp->data = data; | |
1559 | if (!get_next_task) | |
1560 | die("BUG: you need to specify a get_next_task function"); | |
1561 | pp->get_next_task = get_next_task; | |
1562 | ||
1563 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1564 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1565 | ||
1566 | pp->nr_processes = 0; | |
1567 | pp->output_owner = 0; | |
1568 | pp->shutdown = 0; | |
1569 | pp->children = xcalloc(n, sizeof(*pp->children)); | |
1570 | pp->pfd = xcalloc(n, sizeof(*pp->pfd)); | |
1571 | strbuf_init(&pp->buffered_output, 0); | |
1572 | ||
1573 | for (i = 0; i < n; i++) { | |
1574 | strbuf_init(&pp->children[i].err, 0); | |
1575 | child_process_init(&pp->children[i].process); | |
1576 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1577 | pp->pfd[i].fd = -1; | |
1578 | } | |
1579 | ||
1580 | pp_for_signal = pp; | |
1581 | sigchain_push_common(handle_children_on_signal); | |
1582 | } | |
1583 | ||
1584 | static void pp_cleanup(struct parallel_processes *pp) | |
1585 | { | |
1586 | int i; | |
1587 | ||
1588 | trace_printf("run_processes_parallel: done"); | |
1589 | for (i = 0; i < pp->max_processes; i++) { | |
1590 | strbuf_release(&pp->children[i].err); | |
1591 | child_process_clear(&pp->children[i].process); | |
1592 | } | |
1593 | ||
1594 | free(pp->children); | |
1595 | free(pp->pfd); | |
1596 | ||
1597 | /* | |
1598 | * When get_next_task added messages to the buffer in its last | |
1599 | * iteration, the buffered output is non empty. | |
1600 | */ | |
2dac9b56 | 1601 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1602 | strbuf_release(&pp->buffered_output); |
1603 | ||
1604 | sigchain_pop_common(); | |
1605 | } | |
1606 | ||
1607 | /* returns | |
1608 | * 0 if a new task was started. | |
1609 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1610 | * problem with starting a new command) | |
1611 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1612 | * to signal the children. | |
1613 | */ | |
1614 | static int pp_start_one(struct parallel_processes *pp) | |
1615 | { | |
1616 | int i, code; | |
1617 | ||
1618 | for (i = 0; i < pp->max_processes; i++) | |
1619 | if (pp->children[i].state == GIT_CP_FREE) | |
1620 | break; | |
1621 | if (i == pp->max_processes) | |
1622 | die("BUG: bookkeeping is hard"); | |
1623 | ||
1624 | code = pp->get_next_task(&pp->children[i].process, | |
1625 | &pp->children[i].err, | |
1626 | pp->data, | |
1627 | &pp->children[i].data); | |
1628 | if (!code) { | |
1629 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1630 | strbuf_reset(&pp->children[i].err); | |
1631 | return 1; | |
1632 | } | |
1633 | pp->children[i].process.err = -1; | |
1634 | pp->children[i].process.stdout_to_stderr = 1; | |
1635 | pp->children[i].process.no_stdin = 1; | |
1636 | ||
1637 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1638 | code = pp->start_failure(&pp->children[i].err, |
c553c72e | 1639 | pp->data, |
c1e860f1 | 1640 | pp->children[i].data); |
c553c72e SB |
1641 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); |
1642 | strbuf_reset(&pp->children[i].err); | |
1643 | if (code) | |
1644 | pp->shutdown = 1; | |
1645 | return code; | |
1646 | } | |
1647 | ||
1648 | pp->nr_processes++; | |
1649 | pp->children[i].state = GIT_CP_WORKING; | |
1650 | pp->pfd[i].fd = pp->children[i].process.err; | |
1651 | return 0; | |
1652 | } | |
1653 | ||
1654 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1655 | { | |
1656 | int i; | |
1657 | ||
1658 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1659 | if (errno == EINTR) | |
1660 | continue; | |
1661 | pp_cleanup(pp); | |
1662 | die_errno("poll"); | |
1663 | } | |
1664 | ||
1665 | /* Buffer output from all pipes. */ | |
1666 | for (i = 0; i < pp->max_processes; i++) { | |
1667 | if (pp->children[i].state == GIT_CP_WORKING && | |
1668 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1669 | int n = strbuf_read_once(&pp->children[i].err, | |
1670 | pp->children[i].process.err, 0); | |
1671 | if (n == 0) { | |
1672 | close(pp->children[i].process.err); | |
1673 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1674 | } else if (n < 0) | |
1675 | if (errno != EAGAIN) | |
1676 | die_errno("read"); | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | static void pp_output(struct parallel_processes *pp) | |
1682 | { | |
1683 | int i = pp->output_owner; | |
1684 | if (pp->children[i].state == GIT_CP_WORKING && | |
1685 | pp->children[i].err.len) { | |
2dac9b56 | 1686 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1687 | strbuf_reset(&pp->children[i].err); |
1688 | } | |
1689 | } | |
1690 | ||
1691 | static int pp_collect_finished(struct parallel_processes *pp) | |
1692 | { | |
1693 | int i, code; | |
1694 | int n = pp->max_processes; | |
1695 | int result = 0; | |
1696 | ||
1697 | while (pp->nr_processes > 0) { | |
1698 | for (i = 0; i < pp->max_processes; i++) | |
1699 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1700 | break; | |
1701 | if (i == pp->max_processes) | |
1702 | break; | |
1703 | ||
1704 | code = finish_command(&pp->children[i].process); | |
1705 | ||
2a73b3da | 1706 | code = pp->task_finished(code, |
c553c72e | 1707 | &pp->children[i].err, pp->data, |
c1e860f1 | 1708 | pp->children[i].data); |
c553c72e SB |
1709 | |
1710 | if (code) | |
1711 | result = code; | |
1712 | if (code < 0) | |
1713 | break; | |
1714 | ||
1715 | pp->nr_processes--; | |
1716 | pp->children[i].state = GIT_CP_FREE; | |
1717 | pp->pfd[i].fd = -1; | |
1718 | child_process_init(&pp->children[i].process); | |
1719 | ||
1720 | if (i != pp->output_owner) { | |
1721 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1722 | strbuf_reset(&pp->children[i].err); | |
1723 | } else { | |
2dac9b56 | 1724 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1725 | strbuf_reset(&pp->children[i].err); |
1726 | ||
1727 | /* Output all other finished child processes */ | |
2dac9b56 | 1728 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1729 | strbuf_reset(&pp->buffered_output); |
1730 | ||
1731 | /* | |
1732 | * Pick next process to output live. | |
1733 | * NEEDSWORK: | |
1734 | * For now we pick it randomly by doing a round | |
1735 | * robin. Later we may want to pick the one with | |
1736 | * the most output or the longest or shortest | |
1737 | * running process time. | |
1738 | */ | |
1739 | for (i = 0; i < n; i++) | |
1740 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1741 | break; | |
1742 | pp->output_owner = (pp->output_owner + i) % n; | |
1743 | } | |
1744 | } | |
1745 | return result; | |
1746 | } | |
1747 | ||
1748 | int run_processes_parallel(int n, | |
1749 | get_next_task_fn get_next_task, | |
1750 | start_failure_fn start_failure, | |
1751 | task_finished_fn task_finished, | |
1752 | void *pp_cb) | |
1753 | { | |
1754 | int i, code; | |
1755 | int output_timeout = 100; | |
1756 | int spawn_cap = 4; | |
1757 | struct parallel_processes pp; | |
1758 | ||
1759 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1760 | while (1) { | |
1761 | for (i = 0; | |
1762 | i < spawn_cap && !pp.shutdown && | |
1763 | pp.nr_processes < pp.max_processes; | |
1764 | i++) { | |
1765 | code = pp_start_one(&pp); | |
1766 | if (!code) | |
1767 | continue; | |
1768 | if (code < 0) { | |
1769 | pp.shutdown = 1; | |
1770 | kill_children(&pp, -code); | |
1771 | } | |
1772 | break; | |
1773 | } | |
1774 | if (!pp.nr_processes) | |
1775 | break; | |
1776 | pp_buffer_stderr(&pp, output_timeout); | |
1777 | pp_output(&pp); | |
1778 | code = pp_collect_finished(&pp); | |
1779 | if (code) { | |
1780 | pp.shutdown = 1; | |
1781 | if (code < 0) | |
1782 | kill_children(&pp, -code); | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | pp_cleanup(&pp); | |
1787 | return 0; | |
1788 | } |