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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" |
b1bf95bb | 6 | |
b3e34ddd BW |
7 | #ifndef SHELL_PATH |
8 | # define SHELL_PATH "/bin/sh" | |
9 | #endif | |
10 | ||
afe19ff7 JK |
11 | struct child_to_clean { |
12 | pid_t pid; | |
13 | struct child_to_clean *next; | |
14 | }; | |
15 | static struct child_to_clean *children_to_clean; | |
16 | static int installed_child_cleanup_handler; | |
17 | ||
18 | static void cleanup_children(int sig) | |
19 | { | |
20 | while (children_to_clean) { | |
21 | struct child_to_clean *p = children_to_clean; | |
22 | children_to_clean = p->next; | |
23 | kill(p->pid, sig); | |
24 | free(p); | |
25 | } | |
26 | } | |
27 | ||
28 | static void cleanup_children_on_signal(int sig) | |
29 | { | |
30 | cleanup_children(sig); | |
31 | sigchain_pop(sig); | |
32 | raise(sig); | |
33 | } | |
34 | ||
35 | static void cleanup_children_on_exit(void) | |
36 | { | |
37 | cleanup_children(SIGTERM); | |
38 | } | |
39 | ||
40 | static void mark_child_for_cleanup(pid_t pid) | |
41 | { | |
42 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
43 | p->pid = pid; | |
44 | p->next = children_to_clean; | |
45 | children_to_clean = p; | |
46 | ||
47 | if (!installed_child_cleanup_handler) { | |
48 | atexit(cleanup_children_on_exit); | |
49 | sigchain_push_common(cleanup_children_on_signal); | |
50 | installed_child_cleanup_handler = 1; | |
51 | } | |
52 | } | |
53 | ||
54 | static void clear_child_for_cleanup(pid_t pid) | |
55 | { | |
bdee397d | 56 | struct child_to_clean **pp; |
afe19ff7 | 57 | |
bdee397d DG |
58 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
59 | struct child_to_clean *clean_me = *pp; | |
60 | ||
61 | if (clean_me->pid == pid) { | |
62 | *pp = clean_me->next; | |
63 | free(clean_me); | |
afe19ff7 JK |
64 | return; |
65 | } | |
66 | } | |
67 | } | |
68 | ||
9dc09c76 SP |
69 | static inline void close_pair(int fd[2]) |
70 | { | |
71 | close(fd[0]); | |
72 | close(fd[1]); | |
73 | } | |
74 | ||
380395d0 | 75 | #ifndef GIT_WINDOWS_NATIVE |
e4507ae8 SP |
76 | static inline void dup_devnull(int to) |
77 | { | |
78 | int fd = open("/dev/null", O_RDWR); | |
a77f106c TR |
79 | if (fd < 0) |
80 | die_errno(_("open /dev/null failed")); | |
81 | if (dup2(fd, to) < 0) | |
82 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
e4507ae8 SP |
83 | close(fd); |
84 | } | |
75301f90 | 85 | #endif |
e4507ae8 | 86 | |
38f865c2 JK |
87 | static char *locate_in_PATH(const char *file) |
88 | { | |
89 | const char *p = getenv("PATH"); | |
90 | struct strbuf buf = STRBUF_INIT; | |
91 | ||
92 | if (!p || !*p) | |
93 | return NULL; | |
94 | ||
95 | while (1) { | |
96 | const char *end = strchrnul(p, ':'); | |
97 | ||
98 | strbuf_reset(&buf); | |
99 | ||
100 | /* POSIX specifies an empty entry as the current directory. */ | |
101 | if (end != p) { | |
102 | strbuf_add(&buf, p, end - p); | |
103 | strbuf_addch(&buf, '/'); | |
104 | } | |
105 | strbuf_addstr(&buf, file); | |
106 | ||
107 | if (!access(buf.buf, F_OK)) | |
108 | return strbuf_detach(&buf, NULL); | |
109 | ||
110 | if (!*end) | |
111 | break; | |
112 | p = end + 1; | |
113 | } | |
114 | ||
115 | strbuf_release(&buf); | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | static int exists_in_PATH(const char *file) | |
120 | { | |
121 | char *r = locate_in_PATH(file); | |
122 | free(r); | |
123 | return r != NULL; | |
124 | } | |
125 | ||
126 | int sane_execvp(const char *file, char * const argv[]) | |
127 | { | |
128 | if (!execvp(file, argv)) | |
129 | return 0; /* cannot happen ;-) */ | |
130 | ||
131 | /* | |
132 | * When a command can't be found because one of the directories | |
133 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
134 | * careful usability testing (read: analysis of occasional bug | |
135 | * reports) reveals that "No such file or directory" is more | |
136 | * intuitive. | |
137 | * | |
138 | * We avoid commands with "/", because execvp will not do $PATH | |
139 | * lookups in that case. | |
140 | * | |
141 | * The reassignment of EACCES to errno looks like a no-op below, | |
142 | * but we need to protect against exists_in_PATH overwriting errno. | |
143 | */ | |
144 | if (errno == EACCES && !strchr(file, '/')) | |
145 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
146 | else if (errno == ENOTDIR && !strchr(file, '/')) |
147 | errno = ENOENT; | |
38f865c2 JK |
148 | return -1; |
149 | } | |
150 | ||
8dba1e63 JK |
151 | static const char **prepare_shell_cmd(const char **argv) |
152 | { | |
153 | int argc, nargc = 0; | |
154 | const char **nargv; | |
155 | ||
156 | for (argc = 0; argv[argc]; argc++) | |
157 | ; /* just counting */ | |
158 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
159 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
160 | ||
161 | if (argc < 1) | |
162 | die("BUG: shell command is empty"); | |
163 | ||
f445644f | 164 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 165 | #ifndef GIT_WINDOWS_NATIVE |
b3e34ddd | 166 | nargv[nargc++] = SHELL_PATH; |
77629754 JS |
167 | #else |
168 | nargv[nargc++] = "sh"; | |
169 | #endif | |
f445644f | 170 | nargv[nargc++] = "-c"; |
8dba1e63 | 171 | |
f445644f JK |
172 | if (argc < 2) |
173 | nargv[nargc++] = argv[0]; | |
174 | else { | |
175 | struct strbuf arg0 = STRBUF_INIT; | |
176 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
177 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
178 | } | |
8dba1e63 JK |
179 | } |
180 | ||
181 | for (argc = 0; argv[argc]; argc++) | |
182 | nargv[nargc++] = argv[argc]; | |
183 | nargv[nargc] = NULL; | |
184 | ||
185 | return nargv; | |
186 | } | |
187 | ||
380395d0 | 188 | #ifndef GIT_WINDOWS_NATIVE |
8dba1e63 JK |
189 | static int execv_shell_cmd(const char **argv) |
190 | { | |
191 | const char **nargv = prepare_shell_cmd(argv); | |
192 | trace_argv_printf(nargv, "trace: exec:"); | |
38f865c2 | 193 | sane_execvp(nargv[0], (char **)nargv); |
8dba1e63 JK |
194 | free(nargv); |
195 | return -1; | |
196 | } | |
197 | #endif | |
198 | ||
380395d0 | 199 | #ifndef GIT_WINDOWS_NATIVE |
a5487ddf | 200 | static int child_err = 2; |
2b541bf8 JS |
201 | static int child_notifier = -1; |
202 | ||
203 | static void notify_parent(void) | |
204 | { | |
a111eb78 JN |
205 | /* |
206 | * execvp failed. If possible, we'd like to let start_command | |
207 | * know, so failures like ENOENT can be handled right away; but | |
208 | * otherwise, finish_command will still report the error. | |
209 | */ | |
210 | xwrite(child_notifier, "", 1); | |
2b541bf8 | 211 | } |
a5487ddf JS |
212 | |
213 | static NORETURN void die_child(const char *err, va_list params) | |
214 | { | |
3bc4181f | 215 | vwritef(child_err, "fatal: ", err, params); |
a5487ddf JS |
216 | exit(128); |
217 | } | |
3bc4181f CB |
218 | |
219 | static void error_child(const char *err, va_list params) | |
220 | { | |
221 | vwritef(child_err, "error: ", err, params); | |
222 | } | |
200a76b7 | 223 | #endif |
a5487ddf JS |
224 | |
225 | static inline void set_cloexec(int fd) | |
226 | { | |
227 | int flags = fcntl(fd, F_GETFD); | |
228 | if (flags >= 0) | |
229 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
230 | } | |
a5487ddf | 231 | |
13274526 | 232 | static int wait_or_whine(pid_t pid, const char *argv0) |
ab0b41da JS |
233 | { |
234 | int status, code = -1; | |
235 | pid_t waiting; | |
236 | int failed_errno = 0; | |
237 | ||
238 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
239 | ; /* nothing */ | |
240 | ||
241 | if (waiting < 0) { | |
242 | failed_errno = errno; | |
243 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
244 | } else if (waiting != pid) { | |
245 | error("waitpid is confused (%s)", argv0); | |
246 | } else if (WIFSIGNALED(status)) { | |
247 | code = WTERMSIG(status); | |
a2767c5c JK |
248 | if (code != SIGINT && code != SIGQUIT) |
249 | error("%s died of signal %d", argv0, code); | |
ab0b41da JS |
250 | /* |
251 | * This return value is chosen so that code & 0xff | |
252 | * mimics the exit code that a POSIX shell would report for | |
253 | * a program that died from this signal. | |
254 | */ | |
709ca730 | 255 | code += 128; |
ab0b41da JS |
256 | } else if (WIFEXITED(status)) { |
257 | code = WEXITSTATUS(status); | |
258 | /* | |
259 | * Convert special exit code when execvp failed. | |
260 | */ | |
261 | if (code == 127) { | |
262 | code = -1; | |
263 | failed_errno = ENOENT; | |
ab0b41da JS |
264 | } |
265 | } else { | |
266 | error("waitpid is confused (%s)", argv0); | |
267 | } | |
afe19ff7 JK |
268 | |
269 | clear_child_for_cleanup(pid); | |
270 | ||
ab0b41da JS |
271 | errno = failed_errno; |
272 | return code; | |
273 | } | |
274 | ||
ebcb5d16 | 275 | int start_command(struct child_process *cmd) |
b1bf95bb | 276 | { |
f3b33f1d JS |
277 | int need_in, need_out, need_err; |
278 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 279 | int failed_errno; |
939296c4 | 280 | char *str; |
4919bf03 | 281 | |
c20181e3 JS |
282 | /* |
283 | * In case of errors we must keep the promise to close FDs | |
284 | * that have been passed in via ->in and ->out. | |
285 | */ | |
286 | ||
e4507ae8 | 287 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 288 | if (need_in) { |
c20181e3 | 289 | if (pipe(fdin) < 0) { |
0ac77ec3 | 290 | failed_errno = errno; |
c20181e3 JS |
291 | if (cmd->out > 0) |
292 | close(cmd->out); | |
939296c4 | 293 | str = "standard input"; |
0ac77ec3 | 294 | goto fail_pipe; |
c20181e3 | 295 | } |
4919bf03 | 296 | cmd->in = fdin[1]; |
4919bf03 SP |
297 | } |
298 | ||
e4507ae8 SP |
299 | need_out = !cmd->no_stdout |
300 | && !cmd->stdout_to_stderr | |
301 | && cmd->out < 0; | |
f4bba25b SP |
302 | if (need_out) { |
303 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 304 | failed_errno = errno; |
f4bba25b SP |
305 | if (need_in) |
306 | close_pair(fdin); | |
c20181e3 JS |
307 | else if (cmd->in) |
308 | close(cmd->in); | |
939296c4 | 309 | str = "standard output"; |
0ac77ec3 | 310 | goto fail_pipe; |
f4bba25b SP |
311 | } |
312 | cmd->out = fdout[0]; | |
f4bba25b SP |
313 | } |
314 | ||
b73a4397 | 315 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
316 | if (need_err) { |
317 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 318 | failed_errno = errno; |
f3b33f1d JS |
319 | if (need_in) |
320 | close_pair(fdin); | |
c20181e3 JS |
321 | else if (cmd->in) |
322 | close(cmd->in); | |
f3b33f1d JS |
323 | if (need_out) |
324 | close_pair(fdout); | |
c20181e3 JS |
325 | else if (cmd->out) |
326 | close(cmd->out); | |
939296c4 | 327 | str = "standard error"; |
0ac77ec3 | 328 | fail_pipe: |
939296c4 SB |
329 | error("cannot create %s pipe for %s: %s", |
330 | str, cmd->argv[0], strerror(failed_errno)); | |
0ac77ec3 JS |
331 | errno = failed_errno; |
332 | return -1; | |
f3b33f1d JS |
333 | } |
334 | cmd->err = fderr[0]; | |
335 | } | |
336 | ||
8852f5d7 | 337 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
13af8cbd | 338 | fflush(NULL); |
8852f5d7 | 339 | |
380395d0 | 340 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
341 | { |
342 | int notify_pipe[2]; | |
343 | if (pipe(notify_pipe)) | |
344 | notify_pipe[0] = notify_pipe[1] = -1; | |
345 | ||
ebcb5d16 | 346 | cmd->pid = fork(); |
25043d8a | 347 | failed_errno = errno; |
ebcb5d16 | 348 | if (!cmd->pid) { |
a5487ddf JS |
349 | /* |
350 | * Redirect the channel to write syscall error messages to | |
351 | * before redirecting the process's stderr so that all die() | |
352 | * in subsequent call paths use the parent's stderr. | |
353 | */ | |
354 | if (cmd->no_stderr || need_err) { | |
355 | child_err = dup(2); | |
356 | set_cloexec(child_err); | |
357 | } | |
358 | set_die_routine(die_child); | |
3bc4181f | 359 | set_error_routine(error_child); |
a5487ddf | 360 | |
2b541bf8 JS |
361 | close(notify_pipe[0]); |
362 | set_cloexec(notify_pipe[1]); | |
363 | child_notifier = notify_pipe[1]; | |
364 | atexit(notify_parent); | |
365 | ||
e4507ae8 SP |
366 | if (cmd->no_stdin) |
367 | dup_devnull(0); | |
368 | else if (need_in) { | |
4919bf03 | 369 | dup2(fdin[0], 0); |
9dc09c76 | 370 | close_pair(fdin); |
4919bf03 SP |
371 | } else if (cmd->in) { |
372 | dup2(cmd->in, 0); | |
373 | close(cmd->in); | |
95d3c4f5 | 374 | } |
4919bf03 | 375 | |
ce2cf27a CC |
376 | if (cmd->no_stderr) |
377 | dup_devnull(2); | |
378 | else if (need_err) { | |
379 | dup2(fderr[1], 2); | |
380 | close_pair(fderr); | |
4f41b611 SP |
381 | } else if (cmd->err > 1) { |
382 | dup2(cmd->err, 2); | |
383 | close(cmd->err); | |
ce2cf27a CC |
384 | } |
385 | ||
e4507ae8 SP |
386 | if (cmd->no_stdout) |
387 | dup_devnull(1); | |
388 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 389 | dup2(2, 1); |
f4bba25b SP |
390 | else if (need_out) { |
391 | dup2(fdout[1], 1); | |
392 | close_pair(fdout); | |
393 | } else if (cmd->out > 1) { | |
394 | dup2(cmd->out, 1); | |
395 | close(cmd->out); | |
396 | } | |
397 | ||
1568fea0 | 398 | if (cmd->dir && chdir(cmd->dir)) |
d824cbba TR |
399 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
400 | cmd->dir); | |
ee493148 | 401 | if (cmd->env) { |
3427b375 AR |
402 | for (; *cmd->env; cmd->env++) { |
403 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 404 | putenv((char *)*cmd->env); |
3427b375 AR |
405 | else |
406 | unsetenv(*cmd->env); | |
407 | } | |
ee493148 | 408 | } |
f1000898 SP |
409 | if (cmd->git_cmd) { |
410 | execv_git_cmd(cmd->argv); | |
8dba1e63 JK |
411 | } else if (cmd->use_shell) { |
412 | execv_shell_cmd(cmd->argv); | |
77cb17e9 | 413 | } else { |
38f865c2 | 414 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 415 | } |
fc1b56f0 CB |
416 | if (errno == ENOENT) { |
417 | if (!cmd->silent_exec_failure) | |
418 | error("cannot run %s: %s", cmd->argv[0], | |
419 | strerror(ENOENT)); | |
a5487ddf | 420 | exit(127); |
fc1b56f0 | 421 | } else { |
a5487ddf | 422 | die_errno("cannot exec '%s'", cmd->argv[0]); |
fc1b56f0 | 423 | } |
b1bf95bb | 424 | } |
0ac77ec3 JS |
425 | if (cmd->pid < 0) |
426 | error("cannot fork() for %s: %s", cmd->argv[0], | |
25043d8a | 427 | strerror(errno)); |
afe19ff7 JK |
428 | else if (cmd->clean_on_exit) |
429 | mark_child_for_cleanup(cmd->pid); | |
2b541bf8 JS |
430 | |
431 | /* | |
432 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
433 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
434 | * child process sends a single byte. | |
435 | * Note that use of this infrastructure is completely advisory, | |
436 | * therefore, we keep error checks minimal. | |
437 | */ | |
438 | close(notify_pipe[1]); | |
439 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
440 | /* | |
441 | * At this point we know that fork() succeeded, but execvp() | |
442 | * failed. Errors have been reported to our stderr. | |
443 | */ | |
13274526 | 444 | wait_or_whine(cmd->pid, cmd->argv[0]); |
2b541bf8 JS |
445 | failed_errno = errno; |
446 | cmd->pid = -1; | |
447 | } | |
448 | close(notify_pipe[0]); | |
afe19ff7 | 449 | |
2b541bf8 | 450 | } |
ba26f296 | 451 | #else |
0d30ad71 | 452 | { |
75301f90 | 453 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 454 | const char **sargv = cmd->argv; |
ba26f296 | 455 | char **env = environ; |
ba26f296 | 456 | |
75301f90 JS |
457 | if (cmd->no_stdin) |
458 | fhin = open("/dev/null", O_RDWR); | |
459 | else if (need_in) | |
460 | fhin = dup(fdin[0]); | |
461 | else if (cmd->in) | |
462 | fhin = dup(cmd->in); | |
463 | ||
464 | if (cmd->no_stderr) | |
465 | fherr = open("/dev/null", O_RDWR); | |
466 | else if (need_err) | |
467 | fherr = dup(fderr[1]); | |
76d44c8c JH |
468 | else if (cmd->err > 2) |
469 | fherr = dup(cmd->err); | |
75301f90 JS |
470 | |
471 | if (cmd->no_stdout) | |
472 | fhout = open("/dev/null", O_RDWR); | |
473 | else if (cmd->stdout_to_stderr) | |
474 | fhout = dup(fherr); | |
475 | else if (need_out) | |
476 | fhout = dup(fdout[1]); | |
477 | else if (cmd->out > 1) | |
478 | fhout = dup(cmd->out); | |
ba26f296 | 479 | |
2affea41 JS |
480 | if (cmd->env) |
481 | env = make_augmented_environ(cmd->env); | |
ba26f296 JS |
482 | |
483 | if (cmd->git_cmd) { | |
108ac313 | 484 | cmd->argv = prepare_git_cmd(cmd->argv); |
8dba1e63 JK |
485 | } else if (cmd->use_shell) { |
486 | cmd->argv = prepare_shell_cmd(cmd->argv); | |
ba26f296 JS |
487 | } |
488 | ||
f9a2743c | 489 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir, |
75301f90 | 490 | fhin, fhout, fherr); |
0ac77ec3 | 491 | failed_errno = errno; |
c024beb5 | 492 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
0ac77ec3 | 493 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); |
afe19ff7 JK |
494 | if (cmd->clean_on_exit && cmd->pid >= 0) |
495 | mark_child_for_cleanup(cmd->pid); | |
ba26f296 JS |
496 | |
497 | if (cmd->env) | |
498 | free_environ(env); | |
499 | if (cmd->git_cmd) | |
108ac313 | 500 | free(cmd->argv); |
ba26f296 | 501 | |
108ac313 | 502 | cmd->argv = sargv; |
75301f90 JS |
503 | if (fhin != 0) |
504 | close(fhin); | |
505 | if (fhout != 1) | |
506 | close(fhout); | |
507 | if (fherr != 2) | |
508 | close(fherr); | |
0d30ad71 | 509 | } |
ba26f296 JS |
510 | #endif |
511 | ||
512 | if (cmd->pid < 0) { | |
513 | if (need_in) | |
514 | close_pair(fdin); | |
515 | else if (cmd->in) | |
516 | close(cmd->in); | |
517 | if (need_out) | |
518 | close_pair(fdout); | |
519 | else if (cmd->out) | |
520 | close(cmd->out); | |
521 | if (need_err) | |
522 | close_pair(fderr); | |
fc012c28 D |
523 | else if (cmd->err) |
524 | close(cmd->err); | |
0ac77ec3 JS |
525 | errno = failed_errno; |
526 | return -1; | |
ba26f296 | 527 | } |
4919bf03 SP |
528 | |
529 | if (need_in) | |
530 | close(fdin[0]); | |
531 | else if (cmd->in) | |
532 | close(cmd->in); | |
533 | ||
f4bba25b SP |
534 | if (need_out) |
535 | close(fdout[1]); | |
c20181e3 | 536 | else if (cmd->out) |
f4bba25b SP |
537 | close(cmd->out); |
538 | ||
f3b33f1d JS |
539 | if (need_err) |
540 | close(fderr[1]); | |
4f41b611 SP |
541 | else if (cmd->err) |
542 | close(cmd->err); | |
f3b33f1d | 543 | |
ebcb5d16 SP |
544 | return 0; |
545 | } | |
546 | ||
2d22c208 JS |
547 | int finish_command(struct child_process *cmd) |
548 | { | |
13274526 | 549 | return wait_or_whine(cmd->pid, cmd->argv[0]); |
2d22c208 JS |
550 | } |
551 | ||
ebcb5d16 SP |
552 | int run_command(struct child_process *cmd) |
553 | { | |
554 | int code = start_command(cmd); | |
555 | if (code) | |
556 | return code; | |
557 | return finish_command(cmd); | |
558 | } | |
559 | ||
1568fea0 | 560 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
561 | const char **argv, |
562 | int opt) | |
1568fea0 AR |
563 | { |
564 | memset(cmd, 0, sizeof(*cmd)); | |
565 | cmd->argv = argv; | |
566 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
567 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
568 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
c024beb5 | 569 | cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; |
8dba1e63 | 570 | cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; |
10c6cddd | 571 | cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; |
1568fea0 AR |
572 | } |
573 | ||
f1000898 SP |
574 | int run_command_v_opt(const char **argv, int opt) |
575 | { | |
576 | struct child_process cmd; | |
1568fea0 AR |
577 | prepare_run_command_v_opt(&cmd, argv, opt); |
578 | return run_command(&cmd); | |
579 | } | |
580 | ||
ee493148 AR |
581 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
582 | { | |
583 | struct child_process cmd; | |
584 | prepare_run_command_v_opt(&cmd, argv, opt); | |
585 | cmd.dir = dir; | |
586 | cmd.env = env; | |
587 | return run_command(&cmd); | |
588 | } | |
2d22c208 | 589 | |
f6b60983 | 590 | #ifndef NO_PTHREADS |
0ea1c89b JS |
591 | static pthread_t main_thread; |
592 | static int main_thread_set; | |
593 | static pthread_key_t async_key; | |
1ece66bc | 594 | static pthread_key_t async_die_counter; |
0ea1c89b | 595 | |
200a76b7 | 596 | static void *run_thread(void *data) |
618ebe9f JS |
597 | { |
598 | struct async *async = data; | |
f6b60983 | 599 | intptr_t ret; |
0ea1c89b JS |
600 | |
601 | pthread_setspecific(async_key, async); | |
f6b60983 | 602 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 603 | return (void *)ret; |
618ebe9f | 604 | } |
0ea1c89b JS |
605 | |
606 | static NORETURN void die_async(const char *err, va_list params) | |
607 | { | |
608 | vreportf("fatal: ", err, params); | |
609 | ||
610 | if (!pthread_equal(main_thread, pthread_self())) { | |
611 | struct async *async = pthread_getspecific(async_key); | |
612 | if (async->proc_in >= 0) | |
613 | close(async->proc_in); | |
614 | if (async->proc_out >= 0) | |
615 | close(async->proc_out); | |
616 | pthread_exit((void *)128); | |
617 | } | |
618 | ||
619 | exit(128); | |
618ebe9f | 620 | } |
1ece66bc JK |
621 | |
622 | static int async_die_is_recursing(void) | |
623 | { | |
624 | void *ret = pthread_getspecific(async_die_counter); | |
625 | pthread_setspecific(async_die_counter, (void *)1); | |
626 | return ret != NULL; | |
627 | } | |
628 | ||
618ebe9f JS |
629 | #endif |
630 | ||
2d22c208 JS |
631 | int start_async(struct async *async) |
632 | { | |
ae6a5609 EFL |
633 | int need_in, need_out; |
634 | int fdin[2], fdout[2]; | |
635 | int proc_in, proc_out; | |
2d22c208 | 636 | |
ae6a5609 EFL |
637 | need_in = async->in < 0; |
638 | if (need_in) { | |
639 | if (pipe(fdin) < 0) { | |
640 | if (async->out > 0) | |
641 | close(async->out); | |
642 | return error("cannot create pipe: %s", strerror(errno)); | |
643 | } | |
644 | async->in = fdin[1]; | |
645 | } | |
646 | ||
647 | need_out = async->out < 0; | |
648 | if (need_out) { | |
649 | if (pipe(fdout) < 0) { | |
650 | if (need_in) | |
651 | close_pair(fdin); | |
652 | else if (async->in) | |
653 | close(async->in); | |
654 | return error("cannot create pipe: %s", strerror(errno)); | |
655 | } | |
656 | async->out = fdout[0]; | |
657 | } | |
658 | ||
659 | if (need_in) | |
660 | proc_in = fdin[0]; | |
661 | else if (async->in) | |
662 | proc_in = async->in; | |
663 | else | |
664 | proc_in = -1; | |
665 | ||
666 | if (need_out) | |
667 | proc_out = fdout[1]; | |
668 | else if (async->out) | |
669 | proc_out = async->out; | |
670 | else | |
671 | proc_out = -1; | |
2d22c208 | 672 | |
f6b60983 | 673 | #ifdef NO_PTHREADS |
2c3766f0 AM |
674 | /* Flush stdio before fork() to avoid cloning buffers */ |
675 | fflush(NULL); | |
676 | ||
2d22c208 JS |
677 | async->pid = fork(); |
678 | if (async->pid < 0) { | |
679 | error("fork (async) failed: %s", strerror(errno)); | |
ae6a5609 | 680 | goto error; |
2d22c208 JS |
681 | } |
682 | if (!async->pid) { | |
ae6a5609 EFL |
683 | if (need_in) |
684 | close(fdin[1]); | |
685 | if (need_out) | |
686 | close(fdout[0]); | |
687 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
2d22c208 | 688 | } |
ae6a5609 | 689 | |
afe19ff7 JK |
690 | mark_child_for_cleanup(async->pid); |
691 | ||
ae6a5609 EFL |
692 | if (need_in) |
693 | close(fdin[0]); | |
694 | else if (async->in) | |
695 | close(async->in); | |
696 | ||
697 | if (need_out) | |
698 | close(fdout[1]); | |
699 | else if (async->out) | |
700 | close(async->out); | |
618ebe9f | 701 | #else |
0ea1c89b JS |
702 | if (!main_thread_set) { |
703 | /* | |
704 | * We assume that the first time that start_async is called | |
705 | * it is from the main thread. | |
706 | */ | |
707 | main_thread_set = 1; | |
708 | main_thread = pthread_self(); | |
709 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 710 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 711 | set_die_routine(die_async); |
1ece66bc | 712 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
713 | } |
714 | ||
200a76b7 JS |
715 | if (proc_in >= 0) |
716 | set_cloexec(proc_in); | |
717 | if (proc_out >= 0) | |
718 | set_cloexec(proc_out); | |
ae6a5609 EFL |
719 | async->proc_in = proc_in; |
720 | async->proc_out = proc_out; | |
200a76b7 JS |
721 | { |
722 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
723 | if (err) { | |
724 | error("cannot create thread: %s", strerror(err)); | |
725 | goto error; | |
726 | } | |
618ebe9f JS |
727 | } |
728 | #endif | |
2d22c208 | 729 | return 0; |
ae6a5609 EFL |
730 | |
731 | error: | |
732 | if (need_in) | |
733 | close_pair(fdin); | |
734 | else if (async->in) | |
735 | close(async->in); | |
736 | ||
737 | if (need_out) | |
738 | close_pair(fdout); | |
739 | else if (async->out) | |
740 | close(async->out); | |
741 | return -1; | |
2d22c208 JS |
742 | } |
743 | ||
744 | int finish_async(struct async *async) | |
745 | { | |
f6b60983 | 746 | #ifdef NO_PTHREADS |
0398fc34 | 747 | return wait_or_whine(async->pid, "child process"); |
618ebe9f | 748 | #else |
200a76b7 JS |
749 | void *ret = (void *)(intptr_t)(-1); |
750 | ||
751 | if (pthread_join(async->tid, &ret)) | |
752 | error("pthread_join failed"); | |
753 | return (int)(intptr_t)ret; | |
618ebe9f | 754 | #endif |
2d22c208 | 755 | } |
ae98a008 | 756 | |
5a7da2dc AS |
757 | char *find_hook(const char *name) |
758 | { | |
759 | char *path = git_path("hooks/%s", name); | |
760 | if (access(path, X_OK) < 0) | |
761 | path = NULL; | |
762 | ||
763 | return path; | |
764 | } | |
765 | ||
ae98a008 SB |
766 | int run_hook(const char *index_file, const char *name, ...) |
767 | { | |
768 | struct child_process hook; | |
5d40a179 JK |
769 | struct argv_array argv = ARGV_ARRAY_INIT; |
770 | const char *p, *env[2]; | |
ae98a008 SB |
771 | char index[PATH_MAX]; |
772 | va_list args; | |
773 | int ret; | |
ae98a008 | 774 | |
5a7da2dc AS |
775 | p = find_hook(name); |
776 | if (!p) | |
cf94ca8e SB |
777 | return 0; |
778 | ||
5a7da2dc AS |
779 | argv_array_push(&argv, p); |
780 | ||
ae98a008 | 781 | va_start(args, name); |
5d40a179 JK |
782 | while ((p = va_arg(args, const char *))) |
783 | argv_array_push(&argv, p); | |
ae98a008 SB |
784 | va_end(args); |
785 | ||
ae98a008 | 786 | memset(&hook, 0, sizeof(hook)); |
5d40a179 | 787 | hook.argv = argv.argv; |
ae98a008 SB |
788 | hook.no_stdin = 1; |
789 | hook.stdout_to_stderr = 1; | |
790 | if (index_file) { | |
791 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
792 | env[0] = index; | |
793 | env[1] = NULL; | |
794 | hook.env = env; | |
795 | } | |
796 | ||
0ac77ec3 | 797 | ret = run_command(&hook); |
5d40a179 | 798 | argv_array_clear(&argv); |
ae98a008 SB |
799 | return ret; |
800 | } |