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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; | |
ac2fbaa6 | 24 | struct child_process *process; |
afe19ff7 JK |
25 | struct child_to_clean *next; |
26 | }; | |
27 | static struct child_to_clean *children_to_clean; | |
28 | static int installed_child_cleanup_handler; | |
29 | ||
507d7804 | 30 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 JK |
31 | { |
32 | while (children_to_clean) { | |
33 | struct child_to_clean *p = children_to_clean; | |
34 | children_to_clean = p->next; | |
ac2fbaa6 LS |
35 | |
36 | if (p->process && !in_signal) { | |
37 | struct child_process *process = p->process; | |
38 | if (process->clean_on_exit_handler) { | |
39 | trace_printf( | |
40 | "trace: run_command: running exit handler for pid %" | |
41 | PRIuMAX, (uintmax_t)p->pid | |
42 | ); | |
43 | process->clean_on_exit_handler(process); | |
44 | } | |
45 | } | |
46 | ||
afe19ff7 | 47 | kill(p->pid, sig); |
507d7804 TI |
48 | if (!in_signal) |
49 | free(p); | |
afe19ff7 JK |
50 | } |
51 | } | |
52 | ||
53 | static void cleanup_children_on_signal(int sig) | |
54 | { | |
507d7804 | 55 | cleanup_children(sig, 1); |
afe19ff7 JK |
56 | sigchain_pop(sig); |
57 | raise(sig); | |
58 | } | |
59 | ||
60 | static void cleanup_children_on_exit(void) | |
61 | { | |
507d7804 | 62 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
63 | } |
64 | ||
ac2fbaa6 | 65 | static void mark_child_for_cleanup(pid_t pid, struct child_process *process) |
afe19ff7 JK |
66 | { |
67 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
68 | p->pid = pid; | |
ac2fbaa6 | 69 | p->process = process; |
afe19ff7 JK |
70 | p->next = children_to_clean; |
71 | children_to_clean = p; | |
72 | ||
73 | if (!installed_child_cleanup_handler) { | |
74 | atexit(cleanup_children_on_exit); | |
75 | sigchain_push_common(cleanup_children_on_signal); | |
76 | installed_child_cleanup_handler = 1; | |
77 | } | |
78 | } | |
79 | ||
80 | static void clear_child_for_cleanup(pid_t pid) | |
81 | { | |
bdee397d | 82 | struct child_to_clean **pp; |
afe19ff7 | 83 | |
bdee397d DG |
84 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
85 | struct child_to_clean *clean_me = *pp; | |
86 | ||
87 | if (clean_me->pid == pid) { | |
88 | *pp = clean_me->next; | |
89 | free(clean_me); | |
afe19ff7 JK |
90 | return; |
91 | } | |
92 | } | |
93 | } | |
94 | ||
9dc09c76 SP |
95 | static inline void close_pair(int fd[2]) |
96 | { | |
97 | close(fd[0]); | |
98 | close(fd[1]); | |
99 | } | |
100 | ||
380395d0 | 101 | #ifndef GIT_WINDOWS_NATIVE |
e4507ae8 SP |
102 | static inline void dup_devnull(int to) |
103 | { | |
104 | int fd = open("/dev/null", O_RDWR); | |
a77f106c TR |
105 | if (fd < 0) |
106 | die_errno(_("open /dev/null failed")); | |
107 | if (dup2(fd, to) < 0) | |
108 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
e4507ae8 SP |
109 | close(fd); |
110 | } | |
75301f90 | 111 | #endif |
e4507ae8 | 112 | |
38f865c2 JK |
113 | static char *locate_in_PATH(const char *file) |
114 | { | |
115 | const char *p = getenv("PATH"); | |
116 | struct strbuf buf = STRBUF_INIT; | |
117 | ||
118 | if (!p || !*p) | |
119 | return NULL; | |
120 | ||
121 | while (1) { | |
122 | const char *end = strchrnul(p, ':'); | |
123 | ||
124 | strbuf_reset(&buf); | |
125 | ||
126 | /* POSIX specifies an empty entry as the current directory. */ | |
127 | if (end != p) { | |
128 | strbuf_add(&buf, p, end - p); | |
129 | strbuf_addch(&buf, '/'); | |
130 | } | |
131 | strbuf_addstr(&buf, file); | |
132 | ||
133 | if (!access(buf.buf, F_OK)) | |
134 | return strbuf_detach(&buf, NULL); | |
135 | ||
136 | if (!*end) | |
137 | break; | |
138 | p = end + 1; | |
139 | } | |
140 | ||
141 | strbuf_release(&buf); | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | static int exists_in_PATH(const char *file) | |
146 | { | |
147 | char *r = locate_in_PATH(file); | |
148 | free(r); | |
149 | return r != NULL; | |
150 | } | |
151 | ||
152 | int sane_execvp(const char *file, char * const argv[]) | |
153 | { | |
154 | if (!execvp(file, argv)) | |
155 | return 0; /* cannot happen ;-) */ | |
156 | ||
157 | /* | |
158 | * When a command can't be found because one of the directories | |
159 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
160 | * careful usability testing (read: analysis of occasional bug | |
161 | * reports) reveals that "No such file or directory" is more | |
162 | * intuitive. | |
163 | * | |
164 | * We avoid commands with "/", because execvp will not do $PATH | |
165 | * lookups in that case. | |
166 | * | |
167 | * The reassignment of EACCES to errno looks like a no-op below, | |
168 | * but we need to protect against exists_in_PATH overwriting errno. | |
169 | */ | |
170 | if (errno == EACCES && !strchr(file, '/')) | |
171 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
172 | else if (errno == ENOTDIR && !strchr(file, '/')) |
173 | errno = ENOENT; | |
38f865c2 JK |
174 | return -1; |
175 | } | |
176 | ||
20574f55 | 177 | static const char **prepare_shell_cmd(struct argv_array *out, const char **argv) |
8dba1e63 | 178 | { |
20574f55 | 179 | if (!argv[0]) |
8dba1e63 JK |
180 | die("BUG: shell command is empty"); |
181 | ||
f445644f | 182 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 183 | #ifndef GIT_WINDOWS_NATIVE |
20574f55 | 184 | argv_array_push(out, SHELL_PATH); |
77629754 | 185 | #else |
20574f55 | 186 | argv_array_push(out, "sh"); |
77629754 | 187 | #endif |
20574f55 | 188 | argv_array_push(out, "-c"); |
8dba1e63 | 189 | |
20574f55 JK |
190 | /* |
191 | * If we have no extra arguments, we do not even need to | |
192 | * bother with the "$@" magic. | |
193 | */ | |
194 | if (!argv[1]) | |
195 | argv_array_push(out, argv[0]); | |
196 | else | |
197 | argv_array_pushf(out, "%s \"$@\"", argv[0]); | |
198 | } | |
8dba1e63 | 199 | |
20574f55 JK |
200 | argv_array_pushv(out, argv); |
201 | return out->argv; | |
8dba1e63 JK |
202 | } |
203 | ||
380395d0 | 204 | #ifndef GIT_WINDOWS_NATIVE |
8dba1e63 JK |
205 | static int execv_shell_cmd(const char **argv) |
206 | { | |
20574f55 JK |
207 | struct argv_array nargv = ARGV_ARRAY_INIT; |
208 | prepare_shell_cmd(&nargv, argv); | |
209 | trace_argv_printf(nargv.argv, "trace: exec:"); | |
210 | sane_execvp(nargv.argv[0], (char **)nargv.argv); | |
211 | argv_array_clear(&nargv); | |
8dba1e63 JK |
212 | return -1; |
213 | } | |
214 | #endif | |
215 | ||
380395d0 | 216 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
217 | static int child_notifier = -1; |
218 | ||
219 | static void notify_parent(void) | |
220 | { | |
a111eb78 JN |
221 | /* |
222 | * execvp failed. If possible, we'd like to let start_command | |
223 | * know, so failures like ENOENT can be handled right away; but | |
224 | * otherwise, finish_command will still report the error. | |
225 | */ | |
226 | xwrite(child_notifier, "", 1); | |
2b541bf8 | 227 | } |
200a76b7 | 228 | #endif |
a5487ddf JS |
229 | |
230 | static inline void set_cloexec(int fd) | |
231 | { | |
232 | int flags = fcntl(fd, F_GETFD); | |
233 | if (flags >= 0) | |
234 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
235 | } | |
a5487ddf | 236 | |
507d7804 | 237 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
238 | { |
239 | int status, code = -1; | |
240 | pid_t waiting; | |
241 | int failed_errno = 0; | |
242 | ||
243 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
244 | ; /* nothing */ | |
507d7804 TI |
245 | if (in_signal) |
246 | return 0; | |
ab0b41da JS |
247 | |
248 | if (waiting < 0) { | |
249 | failed_errno = errno; | |
fbcb0e06 | 250 | error_errno("waitpid for %s failed", argv0); |
ab0b41da JS |
251 | } else if (waiting != pid) { |
252 | error("waitpid is confused (%s)", argv0); | |
253 | } else if (WIFSIGNALED(status)) { | |
254 | code = WTERMSIG(status); | |
ac78663b | 255 | if (code != SIGINT && code != SIGQUIT && code != SIGPIPE) |
a2767c5c | 256 | error("%s died of signal %d", argv0, code); |
ab0b41da JS |
257 | /* |
258 | * This return value is chosen so that code & 0xff | |
259 | * mimics the exit code that a POSIX shell would report for | |
260 | * a program that died from this signal. | |
261 | */ | |
709ca730 | 262 | code += 128; |
ab0b41da JS |
263 | } else if (WIFEXITED(status)) { |
264 | code = WEXITSTATUS(status); | |
265 | /* | |
266 | * Convert special exit code when execvp failed. | |
267 | */ | |
268 | if (code == 127) { | |
269 | code = -1; | |
270 | failed_errno = ENOENT; | |
ab0b41da JS |
271 | } |
272 | } else { | |
273 | error("waitpid is confused (%s)", argv0); | |
274 | } | |
afe19ff7 JK |
275 | |
276 | clear_child_for_cleanup(pid); | |
277 | ||
ab0b41da JS |
278 | errno = failed_errno; |
279 | return code; | |
280 | } | |
281 | ||
ebcb5d16 | 282 | int start_command(struct child_process *cmd) |
b1bf95bb | 283 | { |
f3b33f1d JS |
284 | int need_in, need_out, need_err; |
285 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 286 | int failed_errno; |
939296c4 | 287 | char *str; |
4919bf03 | 288 | |
c460c0ec JK |
289 | if (!cmd->argv) |
290 | cmd->argv = cmd->args.argv; | |
19a583dc RS |
291 | if (!cmd->env) |
292 | cmd->env = cmd->env_array.argv; | |
c460c0ec | 293 | |
c20181e3 JS |
294 | /* |
295 | * In case of errors we must keep the promise to close FDs | |
296 | * that have been passed in via ->in and ->out. | |
297 | */ | |
298 | ||
e4507ae8 | 299 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 300 | if (need_in) { |
c20181e3 | 301 | if (pipe(fdin) < 0) { |
0ac77ec3 | 302 | failed_errno = errno; |
c20181e3 JS |
303 | if (cmd->out > 0) |
304 | close(cmd->out); | |
939296c4 | 305 | str = "standard input"; |
0ac77ec3 | 306 | goto fail_pipe; |
c20181e3 | 307 | } |
4919bf03 | 308 | cmd->in = fdin[1]; |
4919bf03 SP |
309 | } |
310 | ||
e4507ae8 SP |
311 | need_out = !cmd->no_stdout |
312 | && !cmd->stdout_to_stderr | |
313 | && cmd->out < 0; | |
f4bba25b SP |
314 | if (need_out) { |
315 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 316 | failed_errno = errno; |
f4bba25b SP |
317 | if (need_in) |
318 | close_pair(fdin); | |
c20181e3 JS |
319 | else if (cmd->in) |
320 | close(cmd->in); | |
939296c4 | 321 | str = "standard output"; |
0ac77ec3 | 322 | goto fail_pipe; |
f4bba25b SP |
323 | } |
324 | cmd->out = fdout[0]; | |
f4bba25b SP |
325 | } |
326 | ||
b73a4397 | 327 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
328 | if (need_err) { |
329 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 330 | failed_errno = errno; |
f3b33f1d JS |
331 | if (need_in) |
332 | close_pair(fdin); | |
c20181e3 JS |
333 | else if (cmd->in) |
334 | close(cmd->in); | |
f3b33f1d JS |
335 | if (need_out) |
336 | close_pair(fdout); | |
c20181e3 JS |
337 | else if (cmd->out) |
338 | close(cmd->out); | |
939296c4 | 339 | str = "standard error"; |
0ac77ec3 | 340 | fail_pipe: |
939296c4 SB |
341 | error("cannot create %s pipe for %s: %s", |
342 | str, cmd->argv[0], strerror(failed_errno)); | |
2d71608e | 343 | child_process_clear(cmd); |
0ac77ec3 JS |
344 | errno = failed_errno; |
345 | return -1; | |
f3b33f1d JS |
346 | } |
347 | cmd->err = fderr[0]; | |
348 | } | |
349 | ||
8852f5d7 | 350 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
13af8cbd | 351 | fflush(NULL); |
8852f5d7 | 352 | |
380395d0 | 353 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
354 | { |
355 | int notify_pipe[2]; | |
356 | if (pipe(notify_pipe)) | |
357 | notify_pipe[0] = notify_pipe[1] = -1; | |
358 | ||
ebcb5d16 | 359 | cmd->pid = fork(); |
25043d8a | 360 | failed_errno = errno; |
ebcb5d16 | 361 | if (!cmd->pid) { |
a5487ddf JS |
362 | /* |
363 | * Redirect the channel to write syscall error messages to | |
364 | * before redirecting the process's stderr so that all die() | |
365 | * in subsequent call paths use the parent's stderr. | |
366 | */ | |
367 | if (cmd->no_stderr || need_err) { | |
3b331e92 | 368 | int child_err = dup(2); |
a5487ddf | 369 | set_cloexec(child_err); |
3b331e92 | 370 | set_error_handle(fdopen(child_err, "w")); |
a5487ddf | 371 | } |
a5487ddf | 372 | |
2b541bf8 JS |
373 | close(notify_pipe[0]); |
374 | set_cloexec(notify_pipe[1]); | |
375 | child_notifier = notify_pipe[1]; | |
376 | atexit(notify_parent); | |
377 | ||
e4507ae8 SP |
378 | if (cmd->no_stdin) |
379 | dup_devnull(0); | |
380 | else if (need_in) { | |
4919bf03 | 381 | dup2(fdin[0], 0); |
9dc09c76 | 382 | close_pair(fdin); |
4919bf03 SP |
383 | } else if (cmd->in) { |
384 | dup2(cmd->in, 0); | |
385 | close(cmd->in); | |
95d3c4f5 | 386 | } |
4919bf03 | 387 | |
ce2cf27a CC |
388 | if (cmd->no_stderr) |
389 | dup_devnull(2); | |
390 | else if (need_err) { | |
391 | dup2(fderr[1], 2); | |
392 | close_pair(fderr); | |
4f41b611 SP |
393 | } else if (cmd->err > 1) { |
394 | dup2(cmd->err, 2); | |
395 | close(cmd->err); | |
ce2cf27a CC |
396 | } |
397 | ||
e4507ae8 SP |
398 | if (cmd->no_stdout) |
399 | dup_devnull(1); | |
400 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 401 | dup2(2, 1); |
f4bba25b SP |
402 | else if (need_out) { |
403 | dup2(fdout[1], 1); | |
404 | close_pair(fdout); | |
405 | } else if (cmd->out > 1) { | |
406 | dup2(cmd->out, 1); | |
407 | close(cmd->out); | |
408 | } | |
409 | ||
1568fea0 | 410 | if (cmd->dir && chdir(cmd->dir)) |
d824cbba TR |
411 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
412 | cmd->dir); | |
ee493148 | 413 | if (cmd->env) { |
3427b375 AR |
414 | for (; *cmd->env; cmd->env++) { |
415 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 416 | putenv((char *)*cmd->env); |
3427b375 AR |
417 | else |
418 | unsetenv(*cmd->env); | |
419 | } | |
ee493148 | 420 | } |
5a50085c | 421 | if (cmd->git_cmd) |
f1000898 | 422 | execv_git_cmd(cmd->argv); |
5a50085c | 423 | else if (cmd->use_shell) |
8dba1e63 | 424 | execv_shell_cmd(cmd->argv); |
5a50085c | 425 | else |
38f865c2 | 426 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); |
fc1b56f0 CB |
427 | if (errno == ENOENT) { |
428 | if (!cmd->silent_exec_failure) | |
429 | error("cannot run %s: %s", cmd->argv[0], | |
430 | strerror(ENOENT)); | |
a5487ddf | 431 | exit(127); |
fc1b56f0 | 432 | } else { |
a5487ddf | 433 | die_errno("cannot exec '%s'", cmd->argv[0]); |
fc1b56f0 | 434 | } |
b1bf95bb | 435 | } |
0ac77ec3 | 436 | if (cmd->pid < 0) |
fbcb0e06 | 437 | error_errno("cannot fork() for %s", cmd->argv[0]); |
afe19ff7 | 438 | else if (cmd->clean_on_exit) |
ac2fbaa6 | 439 | mark_child_for_cleanup(cmd->pid, cmd); |
2b541bf8 JS |
440 | |
441 | /* | |
442 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
443 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
444 | * child process sends a single byte. | |
445 | * Note that use of this infrastructure is completely advisory, | |
446 | * therefore, we keep error checks minimal. | |
447 | */ | |
448 | close(notify_pipe[1]); | |
449 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
450 | /* | |
451 | * At this point we know that fork() succeeded, but execvp() | |
452 | * failed. Errors have been reported to our stderr. | |
453 | */ | |
507d7804 | 454 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2b541bf8 JS |
455 | failed_errno = errno; |
456 | cmd->pid = -1; | |
457 | } | |
458 | close(notify_pipe[0]); | |
459 | } | |
ba26f296 | 460 | #else |
0d30ad71 | 461 | { |
75301f90 | 462 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 463 | const char **sargv = cmd->argv; |
20574f55 | 464 | struct argv_array nargv = ARGV_ARRAY_INIT; |
ba26f296 | 465 | |
75301f90 JS |
466 | if (cmd->no_stdin) |
467 | fhin = open("/dev/null", O_RDWR); | |
468 | else if (need_in) | |
469 | fhin = dup(fdin[0]); | |
470 | else if (cmd->in) | |
471 | fhin = dup(cmd->in); | |
472 | ||
473 | if (cmd->no_stderr) | |
474 | fherr = open("/dev/null", O_RDWR); | |
475 | else if (need_err) | |
476 | fherr = dup(fderr[1]); | |
76d44c8c JH |
477 | else if (cmd->err > 2) |
478 | fherr = dup(cmd->err); | |
75301f90 JS |
479 | |
480 | if (cmd->no_stdout) | |
481 | fhout = open("/dev/null", O_RDWR); | |
482 | else if (cmd->stdout_to_stderr) | |
483 | fhout = dup(fherr); | |
484 | else if (need_out) | |
485 | fhout = dup(fdout[1]); | |
486 | else if (cmd->out > 1) | |
487 | fhout = dup(cmd->out); | |
ba26f296 | 488 | |
5a50085c | 489 | if (cmd->git_cmd) |
20574f55 | 490 | cmd->argv = prepare_git_cmd(&nargv, cmd->argv); |
5a50085c | 491 | else if (cmd->use_shell) |
20574f55 | 492 | cmd->argv = prepare_shell_cmd(&nargv, cmd->argv); |
ba26f296 | 493 | |
77734da2 KB |
494 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
495 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 496 | failed_errno = errno; |
c024beb5 | 497 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
fbcb0e06 | 498 | error_errno("cannot spawn %s", cmd->argv[0]); |
afe19ff7 | 499 | if (cmd->clean_on_exit && cmd->pid >= 0) |
ac2fbaa6 | 500 | mark_child_for_cleanup(cmd->pid, cmd); |
ba26f296 | 501 | |
20574f55 | 502 | argv_array_clear(&nargv); |
108ac313 | 503 | cmd->argv = sargv; |
75301f90 JS |
504 | if (fhin != 0) |
505 | close(fhin); | |
506 | if (fhout != 1) | |
507 | close(fhout); | |
508 | if (fherr != 2) | |
509 | close(fherr); | |
0d30ad71 | 510 | } |
ba26f296 JS |
511 | #endif |
512 | ||
513 | if (cmd->pid < 0) { | |
514 | if (need_in) | |
515 | close_pair(fdin); | |
516 | else if (cmd->in) | |
517 | close(cmd->in); | |
518 | if (need_out) | |
519 | close_pair(fdout); | |
520 | else if (cmd->out) | |
521 | close(cmd->out); | |
522 | if (need_err) | |
523 | close_pair(fderr); | |
fc012c28 D |
524 | else if (cmd->err) |
525 | close(cmd->err); | |
2d71608e | 526 | child_process_clear(cmd); |
0ac77ec3 JS |
527 | errno = failed_errno; |
528 | return -1; | |
ba26f296 | 529 | } |
4919bf03 SP |
530 | |
531 | if (need_in) | |
532 | close(fdin[0]); | |
533 | else if (cmd->in) | |
534 | close(cmd->in); | |
535 | ||
f4bba25b SP |
536 | if (need_out) |
537 | close(fdout[1]); | |
c20181e3 | 538 | else if (cmd->out) |
f4bba25b SP |
539 | close(cmd->out); |
540 | ||
f3b33f1d JS |
541 | if (need_err) |
542 | close(fderr[1]); | |
4f41b611 SP |
543 | else if (cmd->err) |
544 | close(cmd->err); | |
f3b33f1d | 545 | |
ebcb5d16 SP |
546 | return 0; |
547 | } | |
548 | ||
2d22c208 JS |
549 | int finish_command(struct child_process *cmd) |
550 | { | |
507d7804 | 551 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2d71608e | 552 | child_process_clear(cmd); |
c460c0ec | 553 | return ret; |
2d22c208 JS |
554 | } |
555 | ||
507d7804 TI |
556 | int finish_command_in_signal(struct child_process *cmd) |
557 | { | |
558 | return wait_or_whine(cmd->pid, cmd->argv[0], 1); | |
559 | } | |
560 | ||
561 | ||
ebcb5d16 SP |
562 | int run_command(struct child_process *cmd) |
563 | { | |
c29b3962 JK |
564 | int code; |
565 | ||
566 | if (cmd->out < 0 || cmd->err < 0) | |
567 | die("BUG: run_command with a pipe can cause deadlock"); | |
568 | ||
569 | code = start_command(cmd); | |
ebcb5d16 SP |
570 | if (code) |
571 | return code; | |
572 | return finish_command(cmd); | |
573 | } | |
574 | ||
f1000898 SP |
575 | int run_command_v_opt(const char **argv, int opt) |
576 | { | |
41e9bad7 | 577 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
578 | } |
579 | ||
ee493148 AR |
580 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
581 | { | |
1f87293d RS |
582 | struct child_process cmd = CHILD_PROCESS_INIT; |
583 | cmd.argv = argv; | |
584 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
585 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
586 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
587 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
588 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
589 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
ee493148 AR |
590 | cmd.dir = dir; |
591 | cmd.env = env; | |
592 | return run_command(&cmd); | |
593 | } | |
2d22c208 | 594 | |
f6b60983 | 595 | #ifndef NO_PTHREADS |
0ea1c89b JS |
596 | static pthread_t main_thread; |
597 | static int main_thread_set; | |
598 | static pthread_key_t async_key; | |
1ece66bc | 599 | static pthread_key_t async_die_counter; |
0ea1c89b | 600 | |
200a76b7 | 601 | static void *run_thread(void *data) |
618ebe9f JS |
602 | { |
603 | struct async *async = data; | |
f6b60983 | 604 | intptr_t ret; |
0ea1c89b | 605 | |
c792d7b6 JK |
606 | if (async->isolate_sigpipe) { |
607 | sigset_t mask; | |
608 | sigemptyset(&mask); | |
609 | sigaddset(&mask, SIGPIPE); | |
610 | if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) { | |
611 | ret = error("unable to block SIGPIPE in async thread"); | |
612 | return (void *)ret; | |
613 | } | |
614 | } | |
615 | ||
0ea1c89b | 616 | pthread_setspecific(async_key, async); |
f6b60983 | 617 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 618 | return (void *)ret; |
618ebe9f | 619 | } |
0ea1c89b JS |
620 | |
621 | static NORETURN void die_async(const char *err, va_list params) | |
622 | { | |
623 | vreportf("fatal: ", err, params); | |
624 | ||
661a8cf4 | 625 | if (in_async()) { |
0ea1c89b JS |
626 | struct async *async = pthread_getspecific(async_key); |
627 | if (async->proc_in >= 0) | |
628 | close(async->proc_in); | |
629 | if (async->proc_out >= 0) | |
630 | close(async->proc_out); | |
631 | pthread_exit((void *)128); | |
632 | } | |
633 | ||
634 | exit(128); | |
618ebe9f | 635 | } |
1ece66bc JK |
636 | |
637 | static int async_die_is_recursing(void) | |
638 | { | |
639 | void *ret = pthread_getspecific(async_die_counter); | |
640 | pthread_setspecific(async_die_counter, (void *)1); | |
641 | return ret != NULL; | |
642 | } | |
643 | ||
661a8cf4 JK |
644 | int in_async(void) |
645 | { | |
646 | if (!main_thread_set) | |
647 | return 0; /* no asyncs started yet */ | |
648 | return !pthread_equal(main_thread, pthread_self()); | |
649 | } | |
650 | ||
b992fe10 | 651 | static void NORETURN async_exit(int code) |
9658846c JK |
652 | { |
653 | pthread_exit((void *)(intptr_t)code); | |
654 | } | |
655 | ||
0f4b6db3 EB |
656 | #else |
657 | ||
658 | static struct { | |
659 | void (**handlers)(void); | |
660 | size_t nr; | |
661 | size_t alloc; | |
662 | } git_atexit_hdlrs; | |
663 | ||
664 | static int git_atexit_installed; | |
665 | ||
6066a7ea | 666 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
667 | { |
668 | size_t i; | |
669 | ||
670 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
671 | git_atexit_hdlrs.handlers[i-1](); | |
672 | } | |
673 | ||
6066a7ea | 674 | static void git_atexit_clear(void) |
0f4b6db3 EB |
675 | { |
676 | free(git_atexit_hdlrs.handlers); | |
677 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
678 | git_atexit_installed = 0; | |
679 | } | |
680 | ||
681 | #undef atexit | |
682 | int git_atexit(void (*handler)(void)) | |
683 | { | |
684 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
685 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
686 | if (!git_atexit_installed) { | |
687 | if (atexit(&git_atexit_dispatch)) | |
688 | return -1; | |
689 | git_atexit_installed = 1; | |
690 | } | |
691 | return 0; | |
692 | } | |
693 | #define atexit git_atexit | |
694 | ||
661a8cf4 JK |
695 | static int process_is_async; |
696 | int in_async(void) | |
697 | { | |
698 | return process_is_async; | |
699 | } | |
700 | ||
b992fe10 | 701 | static void NORETURN async_exit(int code) |
9658846c JK |
702 | { |
703 | exit(code); | |
704 | } | |
705 | ||
618ebe9f JS |
706 | #endif |
707 | ||
b992fe10 LS |
708 | void check_pipe(int err) |
709 | { | |
710 | if (err == EPIPE) { | |
711 | if (in_async()) | |
712 | async_exit(141); | |
713 | ||
714 | signal(SIGPIPE, SIG_DFL); | |
715 | raise(SIGPIPE); | |
716 | /* Should never happen, but just in case... */ | |
717 | exit(141); | |
718 | } | |
719 | } | |
720 | ||
2d22c208 JS |
721 | int start_async(struct async *async) |
722 | { | |
ae6a5609 EFL |
723 | int need_in, need_out; |
724 | int fdin[2], fdout[2]; | |
725 | int proc_in, proc_out; | |
2d22c208 | 726 | |
ae6a5609 EFL |
727 | need_in = async->in < 0; |
728 | if (need_in) { | |
729 | if (pipe(fdin) < 0) { | |
730 | if (async->out > 0) | |
731 | close(async->out); | |
fbcb0e06 | 732 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
733 | } |
734 | async->in = fdin[1]; | |
735 | } | |
736 | ||
737 | need_out = async->out < 0; | |
738 | if (need_out) { | |
739 | if (pipe(fdout) < 0) { | |
740 | if (need_in) | |
741 | close_pair(fdin); | |
742 | else if (async->in) | |
743 | close(async->in); | |
fbcb0e06 | 744 | return error_errno("cannot create pipe"); |
ae6a5609 EFL |
745 | } |
746 | async->out = fdout[0]; | |
747 | } | |
748 | ||
749 | if (need_in) | |
750 | proc_in = fdin[0]; | |
751 | else if (async->in) | |
752 | proc_in = async->in; | |
753 | else | |
754 | proc_in = -1; | |
755 | ||
756 | if (need_out) | |
757 | proc_out = fdout[1]; | |
758 | else if (async->out) | |
759 | proc_out = async->out; | |
760 | else | |
761 | proc_out = -1; | |
2d22c208 | 762 | |
f6b60983 | 763 | #ifdef NO_PTHREADS |
2c3766f0 AM |
764 | /* Flush stdio before fork() to avoid cloning buffers */ |
765 | fflush(NULL); | |
766 | ||
2d22c208 JS |
767 | async->pid = fork(); |
768 | if (async->pid < 0) { | |
fbcb0e06 | 769 | error_errno("fork (async) failed"); |
ae6a5609 | 770 | goto error; |
2d22c208 JS |
771 | } |
772 | if (!async->pid) { | |
ae6a5609 EFL |
773 | if (need_in) |
774 | close(fdin[1]); | |
775 | if (need_out) | |
776 | close(fdout[0]); | |
0f4b6db3 | 777 | git_atexit_clear(); |
661a8cf4 | 778 | process_is_async = 1; |
ae6a5609 | 779 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 780 | } |
ae6a5609 | 781 | |
ac2fbaa6 | 782 | mark_child_for_cleanup(async->pid, NULL); |
afe19ff7 | 783 | |
ae6a5609 EFL |
784 | if (need_in) |
785 | close(fdin[0]); | |
786 | else if (async->in) | |
787 | close(async->in); | |
788 | ||
789 | if (need_out) | |
790 | close(fdout[1]); | |
791 | else if (async->out) | |
792 | close(async->out); | |
618ebe9f | 793 | #else |
0ea1c89b JS |
794 | if (!main_thread_set) { |
795 | /* | |
796 | * We assume that the first time that start_async is called | |
797 | * it is from the main thread. | |
798 | */ | |
799 | main_thread_set = 1; | |
800 | main_thread = pthread_self(); | |
801 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 802 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 803 | set_die_routine(die_async); |
1ece66bc | 804 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
805 | } |
806 | ||
200a76b7 JS |
807 | if (proc_in >= 0) |
808 | set_cloexec(proc_in); | |
809 | if (proc_out >= 0) | |
810 | set_cloexec(proc_out); | |
ae6a5609 EFL |
811 | async->proc_in = proc_in; |
812 | async->proc_out = proc_out; | |
200a76b7 JS |
813 | { |
814 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
815 | if (err) { | |
fbcb0e06 | 816 | error_errno("cannot create thread"); |
200a76b7 JS |
817 | goto error; |
818 | } | |
618ebe9f JS |
819 | } |
820 | #endif | |
2d22c208 | 821 | return 0; |
ae6a5609 EFL |
822 | |
823 | error: | |
824 | if (need_in) | |
825 | close_pair(fdin); | |
826 | else if (async->in) | |
827 | close(async->in); | |
828 | ||
829 | if (need_out) | |
830 | close_pair(fdout); | |
831 | else if (async->out) | |
832 | close(async->out); | |
833 | return -1; | |
2d22c208 JS |
834 | } |
835 | ||
836 | int finish_async(struct async *async) | |
837 | { | |
f6b60983 | 838 | #ifdef NO_PTHREADS |
507d7804 | 839 | return wait_or_whine(async->pid, "child process", 0); |
618ebe9f | 840 | #else |
200a76b7 JS |
841 | void *ret = (void *)(intptr_t)(-1); |
842 | ||
843 | if (pthread_join(async->tid, &ret)) | |
844 | error("pthread_join failed"); | |
845 | return (int)(intptr_t)ret; | |
618ebe9f | 846 | #endif |
2d22c208 | 847 | } |
ae98a008 | 848 | |
dcf69262 | 849 | const char *find_hook(const char *name) |
5a7da2dc | 850 | { |
03f2c773 | 851 | static struct strbuf path = STRBUF_INIT; |
5a7da2dc | 852 | |
03f2c773 | 853 | strbuf_reset(&path); |
9445b492 | 854 | strbuf_git_path(&path, "hooks/%s", name); |
03f2c773 JK |
855 | if (access(path.buf, X_OK) < 0) |
856 | return NULL; | |
857 | return path.buf; | |
5a7da2dc AS |
858 | } |
859 | ||
15048f8a | 860 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 861 | { |
d3180279 | 862 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 863 | const char *p; |
ae98a008 | 864 | |
5a7da2dc AS |
865 | p = find_hook(name); |
866 | if (!p) | |
cf94ca8e SB |
867 | return 0; |
868 | ||
d1d09456 RS |
869 | argv_array_push(&hook.args, p); |
870 | while ((p = va_arg(args, const char *))) | |
871 | argv_array_push(&hook.args, p); | |
15048f8a | 872 | hook.env = env; |
ae98a008 SB |
873 | hook.no_stdin = 1; |
874 | hook.stdout_to_stderr = 1; | |
ae98a008 | 875 | |
d1d09456 | 876 | return run_command(&hook); |
ae98a008 | 877 | } |
15048f8a BP |
878 | |
879 | int run_hook_le(const char *const *env, const char *name, ...) | |
880 | { | |
881 | va_list args; | |
882 | int ret; | |
883 | ||
884 | va_start(args, name); | |
885 | ret = run_hook_ve(env, name, args); | |
886 | va_end(args); | |
887 | ||
888 | return ret; | |
889 | } | |
911ec99b | 890 | |
96335bcf JK |
891 | struct io_pump { |
892 | /* initialized by caller */ | |
893 | int fd; | |
894 | int type; /* POLLOUT or POLLIN */ | |
895 | union { | |
896 | struct { | |
897 | const char *buf; | |
898 | size_t len; | |
899 | } out; | |
900 | struct { | |
901 | struct strbuf *buf; | |
902 | size_t hint; | |
903 | } in; | |
904 | } u; | |
905 | ||
906 | /* returned by pump_io */ | |
907 | int error; /* 0 for success, otherwise errno */ | |
908 | ||
909 | /* internal use */ | |
910 | struct pollfd *pfd; | |
911 | }; | |
912 | ||
913 | static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd) | |
914 | { | |
915 | int pollsize = 0; | |
916 | int i; | |
917 | ||
918 | for (i = 0; i < nr; i++) { | |
919 | struct io_pump *io = &slots[i]; | |
920 | if (io->fd < 0) | |
921 | continue; | |
922 | pfd[pollsize].fd = io->fd; | |
923 | pfd[pollsize].events = io->type; | |
924 | io->pfd = &pfd[pollsize++]; | |
925 | } | |
926 | ||
927 | if (!pollsize) | |
928 | return 0; | |
929 | ||
930 | if (poll(pfd, pollsize, -1) < 0) { | |
931 | if (errno == EINTR) | |
932 | return 1; | |
933 | die_errno("poll failed"); | |
934 | } | |
935 | ||
936 | for (i = 0; i < nr; i++) { | |
937 | struct io_pump *io = &slots[i]; | |
938 | ||
939 | if (io->fd < 0) | |
940 | continue; | |
941 | ||
942 | if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL))) | |
943 | continue; | |
944 | ||
945 | if (io->type == POLLOUT) { | |
946 | ssize_t len = xwrite(io->fd, | |
947 | io->u.out.buf, io->u.out.len); | |
948 | if (len < 0) { | |
949 | io->error = errno; | |
950 | close(io->fd); | |
951 | io->fd = -1; | |
952 | } else { | |
953 | io->u.out.buf += len; | |
954 | io->u.out.len -= len; | |
955 | if (!io->u.out.len) { | |
956 | close(io->fd); | |
957 | io->fd = -1; | |
958 | } | |
959 | } | |
960 | } | |
961 | ||
962 | if (io->type == POLLIN) { | |
963 | ssize_t len = strbuf_read_once(io->u.in.buf, | |
964 | io->fd, io->u.in.hint); | |
965 | if (len < 0) | |
966 | io->error = errno; | |
967 | if (len <= 0) { | |
968 | close(io->fd); | |
969 | io->fd = -1; | |
970 | } | |
971 | } | |
972 | } | |
973 | ||
974 | return 1; | |
975 | } | |
976 | ||
977 | static int pump_io(struct io_pump *slots, int nr) | |
911ec99b | 978 | { |
96335bcf JK |
979 | struct pollfd *pfd; |
980 | int i; | |
981 | ||
982 | for (i = 0; i < nr; i++) | |
983 | slots[i].error = 0; | |
984 | ||
985 | ALLOC_ARRAY(pfd, nr); | |
986 | while (pump_io_round(slots, nr, pfd)) | |
987 | ; /* nothing */ | |
988 | free(pfd); | |
989 | ||
990 | /* There may be multiple errno values, so just pick the first. */ | |
991 | for (i = 0; i < nr; i++) { | |
992 | if (slots[i].error) { | |
993 | errno = slots[i].error; | |
994 | return -1; | |
995 | } | |
996 | } | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | ||
1001 | int pipe_command(struct child_process *cmd, | |
1002 | const char *in, size_t in_len, | |
1003 | struct strbuf *out, size_t out_hint, | |
1004 | struct strbuf *err, size_t err_hint) | |
1005 | { | |
1006 | struct io_pump io[3]; | |
1007 | int nr = 0; | |
1008 | ||
1009 | if (in) | |
1010 | cmd->in = -1; | |
1011 | if (out) | |
1012 | cmd->out = -1; | |
1013 | if (err) | |
1014 | cmd->err = -1; | |
1015 | ||
911ec99b JK |
1016 | if (start_command(cmd) < 0) |
1017 | return -1; | |
1018 | ||
96335bcf JK |
1019 | if (in) { |
1020 | io[nr].fd = cmd->in; | |
1021 | io[nr].type = POLLOUT; | |
1022 | io[nr].u.out.buf = in; | |
1023 | io[nr].u.out.len = in_len; | |
1024 | nr++; | |
1025 | } | |
1026 | if (out) { | |
1027 | io[nr].fd = cmd->out; | |
1028 | io[nr].type = POLLIN; | |
1029 | io[nr].u.in.buf = out; | |
1030 | io[nr].u.in.hint = out_hint; | |
1031 | nr++; | |
1032 | } | |
1033 | if (err) { | |
1034 | io[nr].fd = cmd->err; | |
1035 | io[nr].type = POLLIN; | |
1036 | io[nr].u.in.buf = err; | |
1037 | io[nr].u.in.hint = err_hint; | |
1038 | nr++; | |
1039 | } | |
1040 | ||
1041 | if (pump_io(io, nr) < 0) { | |
911ec99b JK |
1042 | finish_command(cmd); /* throw away exit code */ |
1043 | return -1; | |
1044 | } | |
1045 | ||
911ec99b JK |
1046 | return finish_command(cmd); |
1047 | } | |
c553c72e SB |
1048 | |
1049 | enum child_state { | |
1050 | GIT_CP_FREE, | |
1051 | GIT_CP_WORKING, | |
1052 | GIT_CP_WAIT_CLEANUP, | |
1053 | }; | |
1054 | ||
1055 | struct parallel_processes { | |
1056 | void *data; | |
1057 | ||
1058 | int max_processes; | |
1059 | int nr_processes; | |
1060 | ||
1061 | get_next_task_fn get_next_task; | |
1062 | start_failure_fn start_failure; | |
1063 | task_finished_fn task_finished; | |
1064 | ||
1065 | struct { | |
1066 | enum child_state state; | |
1067 | struct child_process process; | |
1068 | struct strbuf err; | |
1069 | void *data; | |
1070 | } *children; | |
1071 | /* | |
1072 | * The struct pollfd is logically part of *children, | |
1073 | * but the system call expects it as its own array. | |
1074 | */ | |
1075 | struct pollfd *pfd; | |
1076 | ||
1077 | unsigned shutdown : 1; | |
1078 | ||
1079 | int output_owner; | |
1080 | struct strbuf buffered_output; /* of finished children */ | |
1081 | }; | |
1082 | ||
aa710494 | 1083 | static int default_start_failure(struct strbuf *out, |
c553c72e SB |
1084 | void *pp_cb, |
1085 | void *pp_task_cb) | |
1086 | { | |
c553c72e SB |
1087 | return 0; |
1088 | } | |
1089 | ||
1090 | static int default_task_finished(int result, | |
aa710494 | 1091 | struct strbuf *out, |
c553c72e SB |
1092 | void *pp_cb, |
1093 | void *pp_task_cb) | |
1094 | { | |
c553c72e SB |
1095 | return 0; |
1096 | } | |
1097 | ||
1098 | static void kill_children(struct parallel_processes *pp, int signo) | |
1099 | { | |
1100 | int i, n = pp->max_processes; | |
1101 | ||
1102 | for (i = 0; i < n; i++) | |
1103 | if (pp->children[i].state == GIT_CP_WORKING) | |
1104 | kill(pp->children[i].process.pid, signo); | |
1105 | } | |
1106 | ||
1107 | static struct parallel_processes *pp_for_signal; | |
1108 | ||
1109 | static void handle_children_on_signal(int signo) | |
1110 | { | |
1111 | kill_children(pp_for_signal, signo); | |
1112 | sigchain_pop(signo); | |
1113 | raise(signo); | |
1114 | } | |
1115 | ||
1116 | static void pp_init(struct parallel_processes *pp, | |
1117 | int n, | |
1118 | get_next_task_fn get_next_task, | |
1119 | start_failure_fn start_failure, | |
1120 | task_finished_fn task_finished, | |
1121 | void *data) | |
1122 | { | |
1123 | int i; | |
1124 | ||
1125 | if (n < 1) | |
1126 | n = online_cpus(); | |
1127 | ||
1128 | pp->max_processes = n; | |
1129 | ||
1130 | trace_printf("run_processes_parallel: preparing to run up to %d tasks", n); | |
1131 | ||
1132 | pp->data = data; | |
1133 | if (!get_next_task) | |
1134 | die("BUG: you need to specify a get_next_task function"); | |
1135 | pp->get_next_task = get_next_task; | |
1136 | ||
1137 | pp->start_failure = start_failure ? start_failure : default_start_failure; | |
1138 | pp->task_finished = task_finished ? task_finished : default_task_finished; | |
1139 | ||
1140 | pp->nr_processes = 0; | |
1141 | pp->output_owner = 0; | |
1142 | pp->shutdown = 0; | |
1143 | pp->children = xcalloc(n, sizeof(*pp->children)); | |
1144 | pp->pfd = xcalloc(n, sizeof(*pp->pfd)); | |
1145 | strbuf_init(&pp->buffered_output, 0); | |
1146 | ||
1147 | for (i = 0; i < n; i++) { | |
1148 | strbuf_init(&pp->children[i].err, 0); | |
1149 | child_process_init(&pp->children[i].process); | |
1150 | pp->pfd[i].events = POLLIN | POLLHUP; | |
1151 | pp->pfd[i].fd = -1; | |
1152 | } | |
1153 | ||
1154 | pp_for_signal = pp; | |
1155 | sigchain_push_common(handle_children_on_signal); | |
1156 | } | |
1157 | ||
1158 | static void pp_cleanup(struct parallel_processes *pp) | |
1159 | { | |
1160 | int i; | |
1161 | ||
1162 | trace_printf("run_processes_parallel: done"); | |
1163 | for (i = 0; i < pp->max_processes; i++) { | |
1164 | strbuf_release(&pp->children[i].err); | |
1165 | child_process_clear(&pp->children[i].process); | |
1166 | } | |
1167 | ||
1168 | free(pp->children); | |
1169 | free(pp->pfd); | |
1170 | ||
1171 | /* | |
1172 | * When get_next_task added messages to the buffer in its last | |
1173 | * iteration, the buffered output is non empty. | |
1174 | */ | |
2dac9b56 | 1175 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1176 | strbuf_release(&pp->buffered_output); |
1177 | ||
1178 | sigchain_pop_common(); | |
1179 | } | |
1180 | ||
1181 | /* returns | |
1182 | * 0 if a new task was started. | |
1183 | * 1 if no new jobs was started (get_next_task ran out of work, non critical | |
1184 | * problem with starting a new command) | |
1185 | * <0 no new job was started, user wishes to shutdown early. Use negative code | |
1186 | * to signal the children. | |
1187 | */ | |
1188 | static int pp_start_one(struct parallel_processes *pp) | |
1189 | { | |
1190 | int i, code; | |
1191 | ||
1192 | for (i = 0; i < pp->max_processes; i++) | |
1193 | if (pp->children[i].state == GIT_CP_FREE) | |
1194 | break; | |
1195 | if (i == pp->max_processes) | |
1196 | die("BUG: bookkeeping is hard"); | |
1197 | ||
1198 | code = pp->get_next_task(&pp->children[i].process, | |
1199 | &pp->children[i].err, | |
1200 | pp->data, | |
1201 | &pp->children[i].data); | |
1202 | if (!code) { | |
1203 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1204 | strbuf_reset(&pp->children[i].err); | |
1205 | return 1; | |
1206 | } | |
1207 | pp->children[i].process.err = -1; | |
1208 | pp->children[i].process.stdout_to_stderr = 1; | |
1209 | pp->children[i].process.no_stdin = 1; | |
1210 | ||
1211 | if (start_command(&pp->children[i].process)) { | |
2a73b3da | 1212 | code = pp->start_failure(&pp->children[i].err, |
c553c72e SB |
1213 | pp->data, |
1214 | &pp->children[i].data); | |
1215 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1216 | strbuf_reset(&pp->children[i].err); | |
1217 | if (code) | |
1218 | pp->shutdown = 1; | |
1219 | return code; | |
1220 | } | |
1221 | ||
1222 | pp->nr_processes++; | |
1223 | pp->children[i].state = GIT_CP_WORKING; | |
1224 | pp->pfd[i].fd = pp->children[i].process.err; | |
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout) | |
1229 | { | |
1230 | int i; | |
1231 | ||
1232 | while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) { | |
1233 | if (errno == EINTR) | |
1234 | continue; | |
1235 | pp_cleanup(pp); | |
1236 | die_errno("poll"); | |
1237 | } | |
1238 | ||
1239 | /* Buffer output from all pipes. */ | |
1240 | for (i = 0; i < pp->max_processes; i++) { | |
1241 | if (pp->children[i].state == GIT_CP_WORKING && | |
1242 | pp->pfd[i].revents & (POLLIN | POLLHUP)) { | |
1243 | int n = strbuf_read_once(&pp->children[i].err, | |
1244 | pp->children[i].process.err, 0); | |
1245 | if (n == 0) { | |
1246 | close(pp->children[i].process.err); | |
1247 | pp->children[i].state = GIT_CP_WAIT_CLEANUP; | |
1248 | } else if (n < 0) | |
1249 | if (errno != EAGAIN) | |
1250 | die_errno("read"); | |
1251 | } | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | static void pp_output(struct parallel_processes *pp) | |
1256 | { | |
1257 | int i = pp->output_owner; | |
1258 | if (pp->children[i].state == GIT_CP_WORKING && | |
1259 | pp->children[i].err.len) { | |
2dac9b56 | 1260 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1261 | strbuf_reset(&pp->children[i].err); |
1262 | } | |
1263 | } | |
1264 | ||
1265 | static int pp_collect_finished(struct parallel_processes *pp) | |
1266 | { | |
1267 | int i, code; | |
1268 | int n = pp->max_processes; | |
1269 | int result = 0; | |
1270 | ||
1271 | while (pp->nr_processes > 0) { | |
1272 | for (i = 0; i < pp->max_processes; i++) | |
1273 | if (pp->children[i].state == GIT_CP_WAIT_CLEANUP) | |
1274 | break; | |
1275 | if (i == pp->max_processes) | |
1276 | break; | |
1277 | ||
1278 | code = finish_command(&pp->children[i].process); | |
1279 | ||
2a73b3da | 1280 | code = pp->task_finished(code, |
c553c72e SB |
1281 | &pp->children[i].err, pp->data, |
1282 | &pp->children[i].data); | |
1283 | ||
1284 | if (code) | |
1285 | result = code; | |
1286 | if (code < 0) | |
1287 | break; | |
1288 | ||
1289 | pp->nr_processes--; | |
1290 | pp->children[i].state = GIT_CP_FREE; | |
1291 | pp->pfd[i].fd = -1; | |
1292 | child_process_init(&pp->children[i].process); | |
1293 | ||
1294 | if (i != pp->output_owner) { | |
1295 | strbuf_addbuf(&pp->buffered_output, &pp->children[i].err); | |
1296 | strbuf_reset(&pp->children[i].err); | |
1297 | } else { | |
2dac9b56 | 1298 | strbuf_write(&pp->children[i].err, stderr); |
c553c72e SB |
1299 | strbuf_reset(&pp->children[i].err); |
1300 | ||
1301 | /* Output all other finished child processes */ | |
2dac9b56 | 1302 | strbuf_write(&pp->buffered_output, stderr); |
c553c72e SB |
1303 | strbuf_reset(&pp->buffered_output); |
1304 | ||
1305 | /* | |
1306 | * Pick next process to output live. | |
1307 | * NEEDSWORK: | |
1308 | * For now we pick it randomly by doing a round | |
1309 | * robin. Later we may want to pick the one with | |
1310 | * the most output or the longest or shortest | |
1311 | * running process time. | |
1312 | */ | |
1313 | for (i = 0; i < n; i++) | |
1314 | if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING) | |
1315 | break; | |
1316 | pp->output_owner = (pp->output_owner + i) % n; | |
1317 | } | |
1318 | } | |
1319 | return result; | |
1320 | } | |
1321 | ||
1322 | int run_processes_parallel(int n, | |
1323 | get_next_task_fn get_next_task, | |
1324 | start_failure_fn start_failure, | |
1325 | task_finished_fn task_finished, | |
1326 | void *pp_cb) | |
1327 | { | |
1328 | int i, code; | |
1329 | int output_timeout = 100; | |
1330 | int spawn_cap = 4; | |
1331 | struct parallel_processes pp; | |
1332 | ||
1333 | pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb); | |
1334 | while (1) { | |
1335 | for (i = 0; | |
1336 | i < spawn_cap && !pp.shutdown && | |
1337 | pp.nr_processes < pp.max_processes; | |
1338 | i++) { | |
1339 | code = pp_start_one(&pp); | |
1340 | if (!code) | |
1341 | continue; | |
1342 | if (code < 0) { | |
1343 | pp.shutdown = 1; | |
1344 | kill_children(&pp, -code); | |
1345 | } | |
1346 | break; | |
1347 | } | |
1348 | if (!pp.nr_processes) | |
1349 | break; | |
1350 | pp_buffer_stderr(&pp, output_timeout); | |
1351 | pp_output(&pp); | |
1352 | code = pp_collect_finished(&pp); | |
1353 | if (code) { | |
1354 | pp.shutdown = 1; | |
1355 | if (code < 0) | |
1356 | kill_children(&pp, -code); | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | pp_cleanup(&pp); | |
1361 | return 0; | |
1362 | } |