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Commit | Line | Data |
---|---|---|
b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
afe19ff7 | 4 | #include "sigchain.h" |
5d40a179 | 5 | #include "argv-array.h" |
c553c72e SB |
6 | #include "thread-utils.h" |
7 | #include "strbuf.h" | |
b1bf95bb | 8 | |
483bbd4e RS |
9 | void child_process_init(struct child_process *child) |
10 | { | |
11 | memset(child, 0, sizeof(*child)); | |
12 | argv_array_init(&child->args); | |
19a583dc | 13 | argv_array_init(&child->env_array); |
483bbd4e RS |
14 | } |
15 | ||
2d71608e RS |
16 | void child_process_clear(struct child_process *child) |
17 | { | |
18 | argv_array_clear(&child->args); | |
19 | argv_array_clear(&child->env_array); | |
20 | } | |
21 | ||
afe19ff7 JK |
22 | struct child_to_clean { |
23 | pid_t pid; | |
24 | struct child_to_clean *next; | |
25 | }; | |
26 | static struct child_to_clean *children_to_clean; | |
27 | static int installed_child_cleanup_handler; | |
28 | ||
507d7804 | 29 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 JK |
30 | { |
31 | while (children_to_clean) { | |
32 | struct child_to_clean *p = children_to_clean; | |
33 | children_to_clean = p->next; | |
34 | kill(p->pid, sig); | |
507d7804 TI |
35 | if (!in_signal) |
36 | free(p); | |
afe19ff7 JK |
37 | } |
38 | } | |
39 | ||
40 | static void cleanup_children_on_signal(int sig) | |
41 | { | |
507d7804 | 42 | cleanup_children(sig, 1); |
afe19ff7 JK |
43 | sigchain_pop(sig); |
44 | raise(sig); | |
45 | } | |
46 | ||
47 | static void cleanup_children_on_exit(void) | |
48 | { | |
507d7804 | 49 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
50 | } |
51 | ||
52 | static void mark_child_for_cleanup(pid_t pid) | |
53 | { | |
54 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
55 | p->pid = pid; | |
56 | p->next = children_to_clean; | |
57 | children_to_clean = p; | |
58 | ||
59 | if (!installed_child_cleanup_handler) { | |
60 | atexit(cleanup_children_on_exit); | |
61 | sigchain_push_common(cleanup_children_on_signal); | |
62 | installed_child_cleanup_handler = 1; | |
63 | } | |
64 | } | |
65 | ||
66 | static void clear_child_for_cleanup(pid_t pid) | |
67 | { | |
bdee397d | 68 | struct child_to_clean **pp; |
afe19ff7 | 69 | |
bdee397d DG |
70 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
71 | struct child_to_clean *clean_me = *pp; | |
72 | ||
73 | if (clean_me->pid == pid) { | |
74 | *pp = clean_me->next; | |
75 | free(clean_me); | |
afe19ff7 JK |
76 | return; |
77 | } | |
78 | } | |
79 | } | |
80 | ||
9dc09c76 SP |
81 | static inline void close_pair(int fd[2]) |
82 | { | |
83 | close(fd[0]); | |
84 | close(fd[1]); | |
85 | } | |
86 | ||
380395d0 | 87 | #ifndef GIT_WINDOWS_NATIVE |
e4507ae8 SP |
88 | static inline void dup_devnull(int to) |
89 | { | |
90 | int fd = open("/dev/null", O_RDWR); | |
a77f106c TR |
91 | if (fd < 0) |
92 | die_errno(_("open /dev/null failed")); | |
93 | if (dup2(fd, to) < 0) | |
94 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
e4507ae8 SP |
95 | close(fd); |
96 | } | |
75301f90 | 97 | #endif |
e4507ae8 | 98 | |
38f865c2 JK |
99 | static char *locate_in_PATH(const char *file) |
100 | { | |
101 | const char *p = getenv("PATH"); | |
102 | struct strbuf buf = STRBUF_INIT; | |
103 | ||
104 | if (!p || !*p) | |
105 | return NULL; | |
106 | ||
107 | while (1) { | |
108 | const char *end = strchrnul(p, ':'); | |
109 | ||
110 | strbuf_reset(&buf); | |
111 | ||
112 | /* POSIX specifies an empty entry as the current directory. */ | |
113 | if (end != p) { | |
114 | strbuf_add(&buf, p, end - p); | |
115 | strbuf_addch(&buf, '/'); | |
116 | } | |
117 | strbuf_addstr(&buf, file); | |
118 | ||
119 | if (!access(buf.buf, F_OK)) | |
120 | return strbuf_detach(&buf, NULL); | |
121 | ||
122 | if (!*end) | |
123 | break; | |
124 | p = end + 1; | |
125 | } | |
126 | ||
127 | strbuf_release(&buf); | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | static int exists_in_PATH(const char *file) | |
132 | { | |
133 | char *r = locate_in_PATH(file); | |
134 | free(r); | |
135 | return r != NULL; | |
136 | } | |
137 | ||
138 | int sane_execvp(const char *file, char * const argv[]) | |
139 | { | |
140 | if (!execvp(file, argv)) | |
141 | return 0; /* cannot happen ;-) */ | |
142 | ||
143 | /* | |
144 | * When a command can't be found because one of the directories | |
145 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
146 | * careful usability testing (read: analysis of occasional bug | |
147 | * reports) reveals that "No such file or directory" is more | |
148 | * intuitive. | |
149 | * | |
150 | * We avoid commands with "/", because execvp will not do $PATH | |
151 | * lookups in that case. | |
152 | * | |
153 | * The reassignment of EACCES to errno looks like a no-op below, | |
154 | * but we need to protect against exists_in_PATH overwriting errno. | |
155 | */ | |
156 | if (errno == EACCES && !strchr(file, '/')) | |
157 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
158 | else if (errno == ENOTDIR && !strchr(file, '/')) |
159 | errno = ENOENT; | |
38f865c2 JK |
160 | return -1; |
161 | } | |
162 | ||
20574f55 | 163 | static const char **prepare_shell_cmd(struct argv_array *out, const char **argv) |
8dba1e63 | 164 | { |
20574f55 | 165 | if (!argv[0]) |
8dba1e63 JK |
166 | die("BUG: shell command is empty"); |
167 | ||
f445644f | 168 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 169 | #ifndef GIT_WINDOWS_NATIVE |
20574f55 | 170 | argv_array_push(out, SHELL_PATH); |
77629754 | 171 | #else |
20574f55 | 172 | argv_array_push(out, "sh"); |
77629754 | 173 | #endif |
20574f55 | 174 | argv_array_push(out, "-c"); |
8dba1e63 | 175 | |
20574f55 JK |
176 | /* |
177 | * If we have no extra arguments, we do not even need to | |
178 | * bother with the "$@" magic. | |
179 | */ | |
180 | if (!argv[1]) | |
181 | argv_array_push(out, argv[0]); | |
182 | else | |
183 | argv_array_pushf(out, "%s \"$@\"", argv[0]); | |
184 | } | |
8dba1e63 | 185 | |
20574f55 JK |
186 | argv_array_pushv(out, argv); |
187 | return out->argv; | |
8dba1e63 JK |
188 | } |
189 | ||
380395d0 | 190 | #ifndef GIT_WINDOWS_NATIVE |
8dba1e63 JK |
191 | static int execv_shell_cmd(const char **argv) |
192 | { | |
20574f55 JK |
193 | struct argv_array nargv = ARGV_ARRAY_INIT; |
194 | prepare_shell_cmd(&nargv, argv); | |
195 | trace_argv_printf(nargv.argv, "trace: exec:"); | |
196 | sane_execvp(nargv.argv[0], (char **)nargv.argv); | |
197 | argv_array_clear(&nargv); | |
8dba1e63 JK |
198 | return -1; |
199 | } | |
200 | #endif | |
201 | ||
380395d0 | 202 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
203 | static int child_notifier = -1; |
204 | ||
205 | static void notify_parent(void) | |
206 | { | |
a111eb78 JN |
207 | /* |
208 | * execvp failed. If possible, we'd like to let start_command | |
209 | * know, so failures like ENOENT can be handled right away; but | |
210 | * otherwise, finish_command will still report the error. | |
211 | */ | |
212 | xwrite(child_notifier, "", 1); | |
2b541bf8 | 213 | } |
200a76b7 | 214 | #endif |
a5487ddf JS |
215 | |
216 | static inline void set_cloexec(int fd) | |
217 | { | |
218 | int flags = fcntl(fd, F_GETFD); | |
219 | if (flags >= 0) | |
220 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
221 | } | |
a5487ddf | 222 | |
507d7804 | 223 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
224 | { |
225 | int status, code = -1; | |
226 | pid_t waiting; | |
227 | int failed_errno = 0; | |
228 | ||
229 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
230 | ; /* nothing */ | |
507d7804 TI |
231 | if (in_signal) |
232 | return 0; | |
ab0b41da JS |
233 | |
234 | if (waiting < 0) { | |
235 | failed_errno = errno; | |
fbcb0e06 | 236 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
237 | } else if (waiting != pid) { |
238 | error("waitpid is confused (%s)", argv0); | |
239 | } else if (WIFSIGNALED(status)) { | |
240 | code = WTERMSIG(status); | |
ac78663b | 241 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 242 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
243 | /* |
244 | * This return value is chosen so that code & 0xff | |
245 | * mimics the exit code that a POSIX shell would report for | |
246 | * a program that died from this signal. | |
247 | */ | |
709ca730 | 248 | code += 128; |
ab0b41da JS |
249 | } else if (WIFEXITED(status)) { |
250 | code = WEXITSTATUS(status); | |
251 | /* | |
252 | * Convert special exit code when execvp failed. | |
253 | */ | |
254 | if (code == 127) { | |
255 | code = -1; | |
256 | failed_errno = ENOENT; | |
ab0b41da JS |
257 | } |
258 | } else { | |
259 | error("waitpid is confused (%s)", argv0); | |
260 | } | |
afe19ff7 JK |
261 | |
262 | clear_child_for_cleanup(pid); | |
263 | ||
ab0b41da JS |
264 | errno = failed_errno; |
265 | return code; | |
266 | } | |
267 | ||
ebcb5d16 | 268 | int start_command(struct child_process *cmd) |
b1bf95bb | 269 | { |
f3b33f1d JS |
270 | int need_in, need_out, need_err; |
271 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 272 | int failed_errno; |
939296c4 | 273 | char *str; |
4919bf03 | 274 | |
c460c0ec JK |
275 | if (!cmd->argv) |
276 | cmd->argv = cmd->args.argv; | |
19a583dc RS |
277 | if (!cmd->env) |
278 | cmd->env = cmd->env_array.argv; | |
c460c0ec | 279 | |
c20181e3 JS |
280 | /* |
281 | * In case of errors we must keep the promise to close FDs | |
282 | * that have been passed in via ->in and ->out. | |
283 | */ | |
284 | ||
e4507ae8 | 285 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 286 | if (need_in) { |
c20181e3 | 287 | if (pipe(fdin) < 0) { |
0ac77ec3 | 288 | failed_errno = errno; |
c20181e3 JS |
289 | if (cmd->out > 0) |
290 | close(cmd->out); | |
939296c4 | 291 | str = "standard input"; |
0ac77ec3 | 292 | goto fail_pipe; |
c20181e3 | 293 | } |
4919bf03 | 294 | cmd->in = fdin[1]; |
4919bf03 SP |
295 | } |
296 | ||
e4507ae8 SP |
297 | need_out = !cmd->no_stdout |
298 | && !cmd->stdout_to_stderr | |
299 | && cmd->out < 0; | |
f4bba25b SP |
300 | if (need_out) { |
301 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 302 | failed_errno = errno; |
f4bba25b SP |
303 | if (need_in) |
304 | close_pair(fdin); | |
c20181e3 JS |
305 | else if (cmd->in) |
306 | close(cmd->in); | |
939296c4 | 307 | str = "standard output"; |
0ac77ec3 | 308 | goto fail_pipe; |
f4bba25b SP |
309 | } |
310 | cmd->out = fdout[0]; | |
f4bba25b SP |
311 | } |
312 | ||
b73a4397 | 313 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
314 | if (need_err) { |
315 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 316 | failed_errno = errno; |
f3b33f1d JS |
317 | if (need_in) |
318 | close_pair(fdin); | |
c20181e3 JS |
319 | else if (cmd->in) |
320 | close(cmd->in); | |
f3b33f1d JS |
321 | if (need_out) |
322 | close_pair(fdout); | |
c20181e3 JS |
323 | else if (cmd->out) |
324 | close(cmd->out); | |
939296c4 | 325 | str = "standard error"; |
0ac77ec3 | 326 | fail_pipe: |
939296c4 SB |
327 | error("cannot create %s pipe for %s: %s", |
328 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 329 | child_process_clear(cmd); |
0ac77ec3 JS |
330 | errno = failed_errno; |
331 | return -1; | |
f3b33f1d JS |
332 | } |
333 | cmd->err = fderr[0]; | |
334 | } | |
335 | ||
8852f5d7 | 336 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
13af8cbd | 337 | fflush(NULL); |
8852f5d7 | 338 | |
380395d0 | 339 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
340 | { |
341 | int notify_pipe[2]; | |
342 | if (pipe(notify_pipe)) | |
343 | notify_pipe[0] = notify_pipe[1] = -1; | |
344 | ||
ebcb5d16 | 345 | cmd->pid = fork(); |
25043d8a | 346 | failed_errno = errno; |
ebcb5d16 | 347 | if (!cmd->pid) { |
a5487ddf JS |
348 | /* |
349 | * Redirect the channel to write syscall error messages to | |
350 | * before redirecting the process's stderr so that all die() | |
351 | * in subsequent call paths use the parent's stderr. | |
352 | */ | |
353 | if (cmd->no_stderr || need_err) { | |
3b331e92 | 354 | int child_err = dup(2); |
a5487ddf | 355 | set_cloexec(child_err); |
3b331e92 | 356 | set_error_handle(fdopen(child_err, "w")); |
a5487ddf | 357 | } |
a5487ddf | 358 | |
2b541bf8 JS |
359 | close(notify_pipe[0]); |
360 | set_cloexec(notify_pipe[1]); | |
361 | child_notifier = notify_pipe[1]; | |
362 | atexit(notify_parent); | |
363 | ||
e4507ae8 SP |
364 | if (cmd->no_stdin) |
365 | dup_devnull(0); | |
366 | else if (need_in) { | |
4919bf03 | 367 | dup2(fdin[0], 0); |
9dc09c76 | 368 | close_pair(fdin); |
4919bf03 SP |
369 | } else if (cmd->in) { |
370 | dup2(cmd->in, 0); | |
371 | close(cmd->in); | |
95d3c4f5 | 372 | } |
4919bf03 | 373 | |
ce2cf27a CC |
374 | if (cmd->no_stderr) |
375 | dup_devnull(2); | |
376 | else if (need_err) { | |
377 | dup2(fderr[1], 2); | |
378 | close_pair(fderr); | |
4f41b611 SP |
379 | } else if (cmd->err > 1) { |
380 | dup2(cmd->err, 2); | |
381 | close(cmd->err); | |
ce2cf27a CC |
382 | } |
383 | ||
e4507ae8 SP |
384 | if (cmd->no_stdout) |
385 | dup_devnull(1); | |
386 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 387 | dup2(2, 1); |
f4bba25b SP |
388 | else if (need_out) { |
389 | dup2(fdout[1], 1); | |
390 | close_pair(fdout); | |
391 | } else if (cmd->out > 1) { | |
392 | dup2(cmd->out, 1); | |
393 | close(cmd->out); | |
394 | } | |
395 | ||
1568fea0 | 396 | if (cmd->dir && chdir(cmd->dir)) |
d824cbba TR |
397 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
398 | cmd->dir); | |
ee493148 | 399 | if (cmd->env) { |
3427b375 AR |
400 | for (; *cmd->env; cmd->env++) { |
401 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 402 | putenv((char *)*cmd->env); |
3427b375 AR |
403 | else |
404 | unsetenv(*cmd->env); | |
405 | } | |
ee493148 | 406 | } |
5a50085c | 407 | if (cmd->git_cmd) |
f1000898 | 408 | execv_git_cmd(cmd->argv); |
5a50085c | 409 | else if (cmd->use_shell) |
8dba1e63 | 410 | execv_shell_cmd(cmd->argv); |
5a50085c | 411 | else |
38f865c2 | 412 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); |
fc1b56f0 CB |
413 | if (errno == ENOENT) { |
414 | if (!cmd->silent_exec_failure) | |
415 | error("cannot run %s: %s", cmd->argv[0], | |
416 | strerror(ENOENT)); | |
a5487ddf | 417 | exit(127); |
fc1b56f0 | 418 | } else { |
a5487ddf | 419 | die_errno("cannot exec '%s'", cmd->argv[0]); |
fc1b56f0 | 420 | } |
b1bf95bb | 421 | } |
0ac77ec3 | 422 | if (cmd->pid < 0) |
fbcb0e06 | 423 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 JK |
424 | else if (cmd->clean_on_exit) |
425 | mark_child_for_cleanup(cmd->pid); | |
2b541bf8 JS |
426 | |
427 | /* | |
428 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
429 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
430 | * child process sends a single byte. | |
431 | * Note that use of this infrastructure is completely advisory, | |
432 | * therefore, we keep error checks minimal. | |
433 | */ | |
434 | close(notify_pipe[1]); | |
435 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
436 | /* | |
437 | * At this point we know that fork() succeeded, but execvp() | |
438 | * failed. Errors have been reported to our stderr. | |
439 | */ | |
507d7804 | 440 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2b541bf8 JS |
441 | failed_errno = errno; |
442 | cmd->pid = -1; | |
443 | } | |
444 | close(notify_pipe[0]); | |
445 | } | |
ba26f296 | 446 | #else |
0d30ad71 | 447 | { |
75301f90 | 448 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 449 | const char **sargv = cmd->argv; |
20574f55 | 450 | struct argv_array nargv = ARGV_ARRAY_INIT; |
ba26f296 | 451 | |
75301f90 JS |
452 | if (cmd->no_stdin) |
453 | fhin = open("/dev/null", O_RDWR); | |
454 | else if (need_in) | |
455 | fhin = dup(fdin[0]); | |
456 | else if (cmd->in) | |
457 | fhin = dup(cmd->in); | |
458 | ||
459 | if (cmd->no_stderr) | |
460 | fherr = open("/dev/null", O_RDWR); | |
461 | else if (need_err) | |
462 | fherr = dup(fderr[1]); | |
76d44c8c JH |
463 | else if (cmd->err > 2) |
464 | fherr = dup(cmd->err); | |
75301f90 JS |
465 | |
466 | if (cmd->no_stdout) | |
467 | fhout = open("/dev/null", O_RDWR); | |
468 | else if (cmd->stdout_to_stderr) | |
469 | fhout = dup(fherr); | |
470 | else if (need_out) | |
471 | fhout = dup(fdout[1]); | |
472 | else if (cmd->out > 1) | |
473 | fhout = dup(cmd->out); | |
ba26f296 | 474 | |
5a50085c | 475 | if (cmd->git_cmd) |
20574f55 | 476 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 477 | else if (cmd->use_shell) |
20574f55 | 478 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 479 | |
77734da2 KB |
480 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
481 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 482 | failed_errno = errno; |
c024beb5 | 483 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 484 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 JK |
485 | if (cmd->clean_on_exit && cmd->pid >= 0) |
486 | mark_child_for_cleanup(cmd->pid); | |
ba26f296 | 487 | |
20574f55 | 488 | argv_array_clear(&nargv); |
108ac313 | 489 | cmd->argv = sargv; |
75301f90 JS |
490 | if (fhin != 0) |
491 | close(fhin); | |
492 | if (fhout != 1) | |
493 | close(fhout); | |
494 | if (fherr != 2) | |
495 | close(fherr); | |
0d30ad71 | 496 | } |
ba26f296 JS |
497 | #endif |
498 | ||
499 | if (cmd->pid < 0) { | |
500 | if (need_in) | |
501 | close_pair(fdin); | |
502 | else if (cmd->in) | |
503 | close(cmd->in); | |
504 | if (need_out) | |
505 | close_pair(fdout); | |
506 | else if (cmd->out) | |
507 | close(cmd->out); | |
508 | if (need_err) | |
509 | close_pair(fderr); | |
fc012c28 D |
510 | else if (cmd->err) |
511 | close(cmd->err); | |
2d71608e | 512 | child_process_clear(cmd); |
0ac77ec3 JS |
513 | errno = failed_errno; |
514 | return -1; | |
ba26f296 | 515 | } |
4919bf03 SP |
516 | |
517 | if (need_in) | |
518 | close(fdin[0]); | |
519 | else if (cmd->in) | |
520 | close(cmd->in); | |
521 | ||
f4bba25b SP |
522 | if (need_out) |
523 | close(fdout[1]); | |
c20181e3 | 524 | else if (cmd->out) |
f4bba25b SP |
525 | close(cmd->out); |
526 | ||
f3b33f1d JS |
527 | if (need_err) |
528 | close(fderr[1]); | |
4f41b611 SP |
529 | else if (cmd->err) |
530 | close(cmd->err); | |
f3b33f1d | 531 | |
ebcb5d16 SP |
532 | return 0; |
533 | } | |
534 | ||
2d22c208 JS |
535 | int finish_command(struct child_process *cmd) |
536 | { | |
507d7804 | 537 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2d71608e | 538 | child_process_clear(cmd); |
c460c0ec | 539 | return ret; |
2d22c208 JS |
540 | } |
541 | ||
507d7804 TI |
542 | int finish_command_in_signal(struct child_process *cmd) |
543 | { | |
544 | return wait_or_whine(cmd->pid, cmd->argv[0], 1); | |
545 | } | |
546 | ||
547 | ||
ebcb5d16 SP |
548 | int run_command(struct child_process *cmd) |
549 | { | |
c29b3962 JK |
550 | int code; |
551 | ||
552 | if (cmd->out < 0 || cmd->err < 0) | |
553 | die("BUG: run_command with a pipe can cause deadlock"); | |
554 | ||
555 | code = start_command(cmd); | |
ebcb5d16 SP |
556 | if (code) |
557 | return code; | |
558 | return finish_command(cmd); | |
559 | } | |
560 | ||
f1000898 SP |
561 | int run_command_v_opt(const char **argv, int opt) |
562 | { | |
41e9bad7 | 563 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
564 | } |
565 | ||
ee493148 AR |
566 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
567 | { | |
1f87293d RS |
568 | struct child_process cmd = CHILD_PROCESS_INIT; |
569 | cmd.argv = argv; | |
570 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
571 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
572 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
573 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
574 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
575 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
ee493148 AR |
576 | cmd.dir = dir; |
577 | cmd.env = env; | |
578 | return run_command(&cmd); | |
579 | } | |
2d22c208 | 580 | |
f6b60983 | 581 | #ifndef NO_PTHREADS |
0ea1c89b JS |
582 | static pthread_t main_thread; |
583 | static int main_thread_set; | |
584 | static pthread_key_t async_key; | |
1ece66bc | 585 | static pthread_key_t async_die_counter; |
0ea1c89b | 586 | |
200a76b7 | 587 | static void *run_thread(void *data) |
618ebe9f JS |
588 | { |
589 | struct async *async = data; | |
f6b60983 | 590 | intptr_t ret; |
0ea1c89b | 591 | |
c792d7b6 JK |
592 | if (async->isolate_sigpipe) { |
593 | sigset_t mask; | |
594 | sigemptyset(&mask); | |
595 | sigaddset(&mask, SIGPIPE); | |
596 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
597 | ret = error("unable to block SIGPIPE in async thread"); | |
598 | return (void *)ret; | |
599 | } | |
600 | } | |
601 | ||
0ea1c89b | 602 | pthread_setspecific(async_key, async); |
f6b60983 | 603 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 604 | return (void *)ret; |
618ebe9f | 605 | } |
0ea1c89b JS |
606 | |
607 | static NORETURN void die_async(const char *err, va_list params) | |
608 | { | |
609 | vreportf("fatal: ", err, params); | |
610 | ||
661a8cf4 | 611 | if (in_async()) { |
0ea1c89b JS |
612 | struct async *async = pthread_getspecific(async_key); |
613 | if (async->proc_in >= 0) | |
614 | close(async->proc_in); | |
615 | if (async->proc_out >= 0) | |
616 | close(async->proc_out); | |
617 | pthread_exit((void *)128); | |
618 | } | |
619 | ||
620 | exit(128); | |
618ebe9f | 621 | } |
1ece66bc JK |
622 | |
623 | static int async_die_is_recursing(void) | |
624 | { | |
625 | void *ret = pthread_getspecific(async_die_counter); | |
626 | pthread_setspecific(async_die_counter, (void *)1); | |
627 | return ret != NULL; | |
628 | } | |
629 | ||
661a8cf4 JK |
630 | int in_async(void) |
631 | { | |
632 | if (!main_thread_set) | |
633 | return 0; /* no asyncs started yet */ | |
634 | return !pthread_equal(main_thread, pthread_self()); | |
635 | } | |
636 | ||
9658846c JK |
637 | void NORETURN async_exit(int code) |
638 | { | |
639 | pthread_exit((void *)(intptr_t)code); | |
640 | } | |
641 | ||
0f4b6db3 EB |
642 | #else |
643 | ||
644 | static struct { | |
645 | void (**handlers)(void); | |
646 | size_t nr; | |
647 | size_t alloc; | |
648 | } git_atexit_hdlrs; | |
649 | ||
650 | static int git_atexit_installed; | |
651 | ||
6066a7ea | 652 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
653 | { |
654 | size_t i; | |
655 | ||
656 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
657 | git_atexit_hdlrs.handlers[i-1](); | |
658 | } | |
659 | ||
6066a7ea | 660 | static void git_atexit_clear(void) |
0f4b6db3 EB |
661 | { |
662 | free(git_atexit_hdlrs.handlers); | |
663 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
664 | git_atexit_installed = 0; | |
665 | } | |
666 | ||
667 | #undef atexit | |
668 | int git_atexit(void (*handler)(void)) | |
669 | { | |
670 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
671 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
672 | if (!git_atexit_installed) { | |
673 | if (atexit(&git_atexit_dispatch)) | |
674 | return -1; | |
675 | git_atexit_installed = 1; | |
676 | } | |
677 | return 0; | |
678 | } | |
679 | #define atexit git_atexit | |
680 | ||
661a8cf4 JK |
681 | static int process_is_async; |
682 | int in_async(void) | |
683 | { | |
684 | return process_is_async; | |
685 | } | |
686 | ||
9658846c JK |
687 | void NORETURN async_exit(int code) |
688 | { | |
689 | exit(code); | |
690 | } | |
691 | ||
618ebe9f JS |
692 | #endif |
693 | ||
2d22c208 JS |
694 | int start_async(struct async *async) |
695 | { | |
ae6a5609 EFL |
696 | int need_in, need_out; |
697 | int fdin[2], fdout[2]; | |
698 | int proc_in, proc_out; | |
2d22c208 | 699 | |
ae6a5609 EFL |
700 | need_in = async->in < 0; |
701 | if (need_in) { | |
702 | if (pipe(fdin) < 0) { | |
703 | if (async->out > 0) | |
704 | close(async->out); | |
fbcb0e06 | 705 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
706 | } |
707 | async->in = fdin[1]; | |
708 | } | |
709 | ||
710 | need_out = async->out < 0; | |
711 | if (need_out) { | |
712 | if (pipe(fdout) < 0) { | |
713 | if (need_in) | |
714 | close_pair(fdin); | |
715 | else if (async->in) | |
716 | close(async->in); | |
fbcb0e06 | 717 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
718 | } |
719 | async->out = fdout[0]; | |
720 | } | |
721 | ||
722 | if (need_in) | |
723 | proc_in = fdin[0]; | |
724 | else if (async->in) | |
725 | proc_in = async->in; | |
726 | else | |
727 | proc_in = -1; | |
728 | ||
729 | if (need_out) | |
730 | proc_out = fdout[1]; | |
731 | else if (async->out) | |
732 | proc_out = async->out; | |
733 | else | |
734 | proc_out = -1; | |
2d22c208 | 735 | |
f6b60983 | 736 | #ifdef NO_PTHREADS |
2c3766f0 AM |
737 | /* Flush stdio before fork() to avoid cloning buffers */ |
738 | fflush(NULL); | |
739 | ||
2d22c208 JS |
740 | async->pid = fork(); |
741 | if (async->pid < 0) { | |
fbcb0e06 | 742 | error_errno("fork (async) failed"); |
ae6a5609 | 743 | goto error; |
2d22c208 JS |
744 | } |
745 | if (!async->pid) { | |
ae6a5609 EFL |
746 | if (need_in) |
747 | close(fdin[1]); | |
748 | if (need_out) | |
749 | close(fdout[0]); | |
0f4b6db3 | 750 | git_atexit_clear(); |
661a8cf4 | 751 | process_is_async = 1; |
ae6a5609 | 752 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 753 | } |
ae6a5609 | 754 | |
afe19ff7 JK |
755 | mark_child_for_cleanup(async->pid); |
756 | ||
ae6a5609 EFL |
757 | if (need_in) |
758 | close(fdin[0]); | |
759 | else if (async->in) | |
760 | close(async->in); | |
761 | ||
762 | if (need_out) | |
763 | close(fdout[1]); | |
764 | else if (async->out) | |
765 | close(async->out); | |
618ebe9f | 766 | #else |
0ea1c89b JS |
767 | if (!main_thread_set) { |
768 | /* | |
769 | * We assume that the first time that start_async is called | |
770 | * it is from the main thread. | |
771 | */ | |
772 | main_thread_set = 1; | |
773 | main_thread = pthread_self(); | |
774 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 775 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 776 | set_die_routine(die_async); |
1ece66bc | 777 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
778 | } |
779 | ||
200a76b7 JS |
780 | if (proc_in >= 0) |
781 | set_cloexec(proc_in); | |
782 | if (proc_out >= 0) | |
783 | set_cloexec(proc_out); | |
ae6a5609 EFL |
784 | async->proc_in = proc_in; |
785 | async->proc_out = proc_out; | |
200a76b7 JS |
786 | { |
787 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
788 | if (err) { | |
fbcb0e06 | 789 | error_errno("cannot create thread"); |
200a76b7 JS |
790 | goto error; |
791 | } | |
618ebe9f JS |
792 | } |
793 | #endif | |
2d22c208 | 794 | return 0; |
ae6a5609 EFL |
795 | |
796 | error: | |
797 | if (need_in) | |
798 | close_pair(fdin); | |
799 | else if (async->in) | |
800 | close(async->in); | |
801 | ||
802 | if (need_out) | |
803 | close_pair(fdout); | |
804 | else if (async->out) | |
805 | close(async->out); | |
806 | return -1; | |
2d22c208 JS |
807 | } |
808 | ||
809 | int finish_async(struct async *async) | |
810 | { | |
f6b60983 | 811 | #ifdef NO_PTHREADS |
507d7804 | 812 | return wait_or_whine(async->pid, "child process", 0); |
618ebe9f | 813 | #else |
200a76b7 JS |
814 | void *ret = (void *)(intptr_t)(-1); |
815 | ||
816 | if (pthread_join(async->tid, &ret)) | |
817 | error("pthread_join failed"); | |
818 | return (int)(intptr_t)ret; | |
618ebe9f | 819 | #endif |
2d22c208 | 820 | } |
ae98a008 | 821 | |
dcf69262 | 822 | const char *find_hook(const char *name) |
5a7da2dc | 823 | { |
03f2c773 | 824 | static struct strbuf path = STRBUF_INIT; |
5a7da2dc | 825 | |
03f2c773 | 826 | strbuf_reset(&path); |
9445b492 | 827 | strbuf_git_path(&path, "hooks/%s", name); |
03f2c773 JK |
828 | if (access(path.buf, X_OK) < 0) |
829 | return NULL; | |
830 | return path.buf; | |
5a7da2dc AS |
831 | } |
832 | ||
15048f8a | 833 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 834 | { |
d3180279 | 835 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 836 | const char *p; |
ae98a008 | 837 | |
5a7da2dc AS |
838 | p = find_hook(name); |
839 | if (!p) | |
cf94ca8e SB |
840 | return 0; |
841 | ||
d1d09456 RS |
842 | argv_array_push(&hook.args, p); |
843 | while ((p = va_arg(args, const char *))) | |
844 | argv_array_push(&hook.args, p); | |
15048f8a | 845 | hook.env = env; |
ae98a008 SB |
846 | hook.no_stdin = 1; |
847 | hook.stdout_to_stderr = 1; | |
ae98a008 | 848 | |
d1d09456 | 849 | return run_command(&hook); |
ae98a008 | 850 | } |
15048f8a BP |
851 | |
852 | int run_hook_le(const char *const *env, const char *name, ...) | |
853 | { | |
854 | va_list args; | |
855 | int ret; | |
856 | ||
857 | va_start(args, name); | |
858 | ret = run_hook_ve(env, name, args); | |
859 | va_end(args); | |
860 | ||
861 | return ret; | |
862 | } | |
911ec99b | 863 | |
96335bcf JK |
864 | struct io_pump { |
865 | /* initialized by caller */ | |
866 | int fd; | |
867 | int type; /* POLLOUT or POLLIN */ | |
868 | union { | |
869 | struct { | |
870 | const char *buf; | |
871 | size_t len; | |
872 | } out; | |
873 | struct { | |
874 | struct strbuf *buf; | |
875 | size_t hint; | |
876 | } in; | |
877 | } u; | |
878 | ||
879 | /* returned by pump_io */ | |
880 | int error; /* 0 for success, otherwise errno */ | |
881 | ||
882 | /* internal use */ | |
883 | struct pollfd *pfd; | |
884 | }; | |
885 | ||
886 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
887 | { | |
888 | int pollsize = 0; | |
889 | int i; | |
890 | ||
891 | for (i = 0; i < nr; i++) { | |
892 | struct io_pump *io = &slots[i]; | |
893 | if (io->fd < 0) | |
894 | continue; | |
895 | pfd[pollsize].fd = io->fd; | |
896 | pfd[pollsize].events = io->type; | |
897 | io->pfd = &pfd[pollsize++]; | |
898 | } | |
899 | ||
900 | if (!pollsize) | |
901 | return 0; | |
902 | ||
903 | if (poll(pfd, pollsize, -1) < 0) { | |
904 | if (errno == EINTR) | |
905 | return 1; | |
906 | die_errno("poll failed"); | |
907 | } | |
908 | ||
909 | for (i = 0; i < nr; i++) { | |
910 | struct io_pump *io = &slots[i]; | |
911 | ||
912 | if (io->fd < 0) | |
913 | continue; | |
914 | ||
915 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
916 | continue; | |
917 | ||
918 | if (io->type == POLLOUT) { | |
919 | ssize_t len = xwrite(io->fd, | |
920 | io->u.out.buf, io->u.out.len); | |
921 | if (len < 0) { | |
922 | io->error = errno; | |
923 | close(io->fd); | |
924 | io->fd = -1; | |
925 | } else { | |
926 | io->u.out.buf += len; | |
927 | io->u.out.len -= len; | |
928 | if (!io->u.out.len) { | |
929 | close(io->fd); | |
930 | io->fd = -1; | |
931 | } | |
932 | } | |
933 | } | |
934 | ||
935 | if (io->type == POLLIN) { | |
936 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
937 | io->fd, io->u.in.hint); | |
938 | if (len < 0) | |
939 | io->error = errno; | |
940 | if (len <= 0) { | |
941 | close(io->fd); | |
942 | io->fd = -1; | |
943 | } | |
944 | } | |
945 | } | |
946 | ||
947 | return 1; | |
948 | } | |
949 | ||
950 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 951 | { |
96335bcf JK |
952 | struct pollfd *pfd; |
953 | int i; | |
954 | ||
955 | for (i = 0; i < nr; i++) | |
956 | slots[i].error = 0; | |
957 | ||
958 | ALLOC_ARRAY(pfd, nr); | |
959 | while (pump_io_round(slots, nr, pfd)) | |
960 | ; /* nothing */ | |
961 | free(pfd); | |
962 | ||
963 | /* There may be multiple errno values, so just pick the first. */ | |
964 | for (i = 0; i < nr; i++) { | |
965 | if (slots[i].error) { | |
966 | errno = slots[i].error; | |
967 | return -1; | |
968 | } | |
969 | } | |
970 | return 0; | |
971 | } | |
972 | ||
973 | ||
974 | int pipe_command(struct child_process *cmd, | |
975 | const char *in, size_t in_len, | |
976 | struct strbuf *out, size_t out_hint, | |
977 | struct strbuf *err, size_t err_hint) | |
978 | { | |
979 | struct io_pump io[3]; | |
980 | int nr = 0; | |
981 | ||
982 | if (in) | |
983 | cmd->in = -1; | |
984 | if (out) | |
985 | cmd->out = -1; | |
986 | if (err) | |
987 | cmd->err = -1; | |
988 | ||
911ec99b JK |
989 | if (start_command(cmd) < 0) |
990 | return -1; | |
991 | ||
96335bcf JK |
992 | if (in) { |
993 | io[nr].fd = cmd->in; | |
994 | io[nr].type = POLLOUT; | |
995 | io[nr].u.out.buf = in; | |
996 | io[nr].u.out.len = in_len; | |
997 | nr++; | |
998 | } | |
999 | if (out) { | |
1000 | io[nr].fd = cmd->out; | |
1001 | io[nr].type = POLLIN; | |
1002 | io[nr].u.in.buf = out; | |
1003 | io[nr].u.in.hint = out_hint; | |
1004 | nr++; | |
1005 | } | |
1006 | if (err) { | |
1007 | io[nr].fd = cmd->err; | |
1008 | io[nr].type = POLLIN; | |
1009 | io[nr].u.in.buf = err; | |
1010 | io[nr].u.in.hint = err_hint; | |
1011 | nr++; | |
1012 | } | |
1013 | ||
1014 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1015 | finish_command(cmd); /* throw away exit code */ |
1016 | return -1; | |
1017 | } | |
1018 | ||
911ec99b JK |
1019 | return finish_command(cmd); |
1020 | } | |
c553c72e SB |
1021 | |
1022 | enum child_state { | |
1023 | GIT_CP_FREE, | |
1024 | GIT_CP_WORKING, | |
1025 | GIT_CP_WAIT_CLEANUP, | |
1026 | }; | |
1027 | ||
1028 | struct parallel_processes { | |
1029 | void *data; | |
1030 | ||
1031 | int max_processes; | |
1032 | int nr_processes; | |
1033 | ||
1034 | get_next_task_fn get_next_task; | |
1035 | start_failure_fn start_failure; | |
1036 | task_finished_fn task_finished; | |
1037 | ||
1038 | struct { | |
1039 | enum child_state state; | |
1040 | struct child_process process; | |
1041 | struct strbuf err; | |
1042 | void *data; | |
1043 | } *children; | |
1044 | /* | |
1045 | * The struct pollfd is logically part of *children, | |
1046 | * but the system call expects it as its own array. | |
1047 | */ | |
1048 | struct pollfd *pfd; | |
1049 | ||
1050 | unsigned shutdown : 1; | |
1051 | ||
1052 | int output_owner; | |
1053 | struct strbuf buffered_output; /* of finished children */ | |
1054 | }; | |
1055 | ||
aa710494 | 1056 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1057 | void *pp_cb, |
1058 | void *pp_task_cb) | |
1059 | { | |
c553c72e SB |
1060 | return 0; |
1061 | } | |
1062 | ||
1063 | static int default_task_finished(int result, | |
aa710494 | 1064 | struct strbuf *out, |
c553c72e SB |
1065 | void *pp_cb, |
1066 | void *pp_task_cb) | |
1067 | { | |
c553c72e SB |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | static void kill_children(struct parallel_processes *pp, int signo) | |
1072 | { | |
1073 | int i, n = pp->max_processes; | |
1074 | ||
1075 | for (i = 0; i < n; i++) | |
1076 | if (pp->children[i].state == GIT_CP_WORKING) | |
1077 | kill(pp->children[i].process.pid, signo); | |
1078 | } | |
1079 | ||
1080 | static struct parallel_processes *pp_for_signal; | |
1081 | ||
1082 | static void handle_children_on_signal(int signo) | |
1083 | { | |
1084 | kill_children(pp_for_signal, signo); | |
1085 | sigchain_pop(signo); | |
1086 | raise(signo); | |
1087 | } | |
1088 | ||
1089 | static void pp_init(struct parallel_processes *pp, | |
1090 | int n, | |
1091 | get_next_task_fn get_next_task, | |
1092 | start_failure_fn start_failure, | |
1093 | task_finished_fn task_finished, | |
1094 | void *data) | |
1095 | { | |
1096 | int i; | |
1097 | ||
1098 | if (n < 1) | |
1099 | n = online_cpus(); | |
1100 | ||
1101 | pp->max_processes = n; | |
1102 | ||
1103 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1104 | ||
1105 | pp->data = data; | |
1106 | if (!get_next_task) | |
1107 | die("BUG: you need to specify a get_next_task function"); | |
1108 | pp->get_next_task = get_next_task; | |
1109 | ||
1110 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1111 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1112 | ||
1113 | pp->nr_processes = 0; | |
1114 | pp->output_owner = 0; | |
1115 | pp->shutdown = 0; | |
1116 | pp->children = xcalloc(n, sizeof(*pp->children)); | |
1117 | pp->pfd = xcalloc(n, sizeof(*pp->pfd)); | |
1118 | strbuf_init(&pp->buffered_output, 0); | |
1119 | ||
1120 | for (i = 0; i < n; i++) { | |
1121 | strbuf_init(&pp->children[i].err, 0); | |
1122 | child_process_init(&pp->children[i].process); | |
1123 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1124 | pp->pfd[i].fd = -1; | |
1125 | } | |
1126 | ||
1127 | pp_for_signal = pp; | |
1128 | sigchain_push_common(handle_children_on_signal); | |
1129 | } | |
1130 | ||
1131 | static void pp_cleanup(struct parallel_processes *pp) | |
1132 | { | |
1133 | int i; | |
1134 | ||
1135 | trace_printf("run_processes_parallel: done"); | |
1136 | for (i = 0; i < pp->max_processes; i++) { | |
1137 | strbuf_release(&pp->children[i].err); | |
1138 | child_process_clear(&pp->children[i].process); | |
1139 | } | |
1140 | ||
1141 | free(pp->children); | |
1142 | free(pp->pfd); | |
1143 | ||
1144 | /* | |
1145 | * When get_next_task added messages to the buffer in its last | |
1146 | * iteration, the buffered output is non empty. | |
1147 | */ | |
2dac9b56 | 1148 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1149 | strbuf_release(&pp->buffered_output); |
1150 | ||
1151 | sigchain_pop_common(); | |
1152 | } | |
1153 | ||
1154 | /* returns | |
1155 | * 0 if a new task was started. | |
1156 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1157 | * problem with starting a new command) | |
1158 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1159 | * to signal the children. | |
1160 | */ | |
1161 | static int pp_start_one(struct parallel_processes *pp) | |
1162 | { | |
1163 | int i, code; | |
1164 | ||
1165 | for (i = 0; i < pp->max_processes; i++) | |
1166 | if (pp->children[i].state == GIT_CP_FREE) | |
1167 | break; | |
1168 | if (i == pp->max_processes) | |
1169 | die("BUG: bookkeeping is hard"); | |
1170 | ||
1171 | code = pp->get_next_task(&pp->children[i].process, | |
1172 | &pp->children[i].err, | |
1173 | pp->data, | |
1174 | &pp->children[i].data); | |
1175 | if (!code) { | |
1176 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1177 | strbuf_reset(&pp->children[i].err); | |
1178 | return 1; | |
1179 | } | |
1180 | pp->children[i].process.err = -1; | |
1181 | pp->children[i].process.stdout_to_stderr = 1; | |
1182 | pp->children[i].process.no_stdin = 1; | |
1183 | ||
1184 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1185 | code = pp->start_failure(&pp->children[i].err, |
c553c72e SB |
1186 | pp->data, |
1187 | &pp->children[i].data); | |
1188 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1189 | strbuf_reset(&pp->children[i].err); | |
1190 | if (code) | |
1191 | pp->shutdown = 1; | |
1192 | return code; | |
1193 | } | |
1194 | ||
1195 | pp->nr_processes++; | |
1196 | pp->children[i].state = GIT_CP_WORKING; | |
1197 | pp->pfd[i].fd = pp->children[i].process.err; | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1202 | { | |
1203 | int i; | |
1204 | ||
1205 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1206 | if (errno == EINTR) | |
1207 | continue; | |
1208 | pp_cleanup(pp); | |
1209 | die_errno("poll"); | |
1210 | } | |
1211 | ||
1212 | /* Buffer output from all pipes. */ | |
1213 | for (i = 0; i < pp->max_processes; i++) { | |
1214 | if (pp->children[i].state == GIT_CP_WORKING && | |
1215 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1216 | int n = strbuf_read_once(&pp->children[i].err, | |
1217 | pp->children[i].process.err, 0); | |
1218 | if (n == 0) { | |
1219 | close(pp->children[i].process.err); | |
1220 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1221 | } else if (n < 0) | |
1222 | if (errno != EAGAIN) | |
1223 | die_errno("read"); | |
1224 | } | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | static void pp_output(struct parallel_processes *pp) | |
1229 | { | |
1230 | int i = pp->output_owner; | |
1231 | if (pp->children[i].state == GIT_CP_WORKING && | |
1232 | pp->children[i].err.len) { | |
2dac9b56 | 1233 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1234 | strbuf_reset(&pp->children[i].err); |
1235 | } | |
1236 | } | |
1237 | ||
1238 | static int pp_collect_finished(struct parallel_processes *pp) | |
1239 | { | |
1240 | int i, code; | |
1241 | int n = pp->max_processes; | |
1242 | int result = 0; | |
1243 | ||
1244 | while (pp->nr_processes > 0) { | |
1245 | for (i = 0; i < pp->max_processes; i++) | |
1246 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1247 | break; | |
1248 | if (i == pp->max_processes) | |
1249 | break; | |
1250 | ||
1251 | code = finish_command(&pp->children[i].process); | |
1252 | ||
2a73b3da | 1253 | code = pp->task_finished(code, |
c553c72e SB |
1254 | &pp->children[i].err, pp->data, |
1255 | &pp->children[i].data); | |
1256 | ||
1257 | if (code) | |
1258 | result = code; | |
1259 | if (code < 0) | |
1260 | break; | |
1261 | ||
1262 | pp->nr_processes--; | |
1263 | pp->children[i].state = GIT_CP_FREE; | |
1264 | pp->pfd[i].fd = -1; | |
1265 | child_process_init(&pp->children[i].process); | |
1266 | ||
1267 | if (i != pp->output_owner) { | |
1268 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1269 | strbuf_reset(&pp->children[i].err); | |
1270 | } else { | |
2dac9b56 | 1271 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1272 | strbuf_reset(&pp->children[i].err); |
1273 | ||
1274 | /* Output all other finished child processes */ | |
2dac9b56 | 1275 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1276 | strbuf_reset(&pp->buffered_output); |
1277 | ||
1278 | /* | |
1279 | * Pick next process to output live. | |
1280 | * NEEDSWORK: | |
1281 | * For now we pick it randomly by doing a round | |
1282 | * robin. Later we may want to pick the one with | |
1283 | * the most output or the longest or shortest | |
1284 | * running process time. | |
1285 | */ | |
1286 | for (i = 0; i < n; i++) | |
1287 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1288 | break; | |
1289 | pp->output_owner = (pp->output_owner + i) % n; | |
1290 | } | |
1291 | } | |
1292 | return result; | |
1293 | } | |
1294 | ||
1295 | int run_processes_parallel(int n, | |
1296 | get_next_task_fn get_next_task, | |
1297 | start_failure_fn start_failure, | |
1298 | task_finished_fn task_finished, | |
1299 | void *pp_cb) | |
1300 | { | |
1301 | int i, code; | |
1302 | int output_timeout = 100; | |
1303 | int spawn_cap = 4; | |
1304 | struct parallel_processes pp; | |
1305 | ||
1306 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1307 | while (1) { | |
1308 | for (i = 0; | |
1309 | i < spawn_cap && !pp.shutdown && | |
1310 | pp.nr_processes < pp.max_processes; | |
1311 | i++) { | |
1312 | code = pp_start_one(&pp); | |
1313 | if (!code) | |
1314 | continue; | |
1315 | if (code < 0) { | |
1316 | pp.shutdown = 1; | |
1317 | kill_children(&pp, -code); | |
1318 | } | |
1319 | break; | |
1320 | } | |
1321 | if (!pp.nr_processes) | |
1322 | break; | |
1323 | pp_buffer_stderr(&pp, output_timeout); | |
1324 | pp_output(&pp); | |
1325 | code = pp_collect_finished(&pp); | |
1326 | if (code) { | |
1327 | pp.shutdown = 1; | |
1328 | if (code < 0) | |
1329 | kill_children(&pp, -code); | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | pp_cleanup(&pp); | |
1334 | return 0; | |
1335 | } |