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 | |
c460c0ec JK |
282 | if (!cmd->argv) |
283 | cmd->argv = cmd->args.argv; | |
284 | ||
c20181e3 JS |
285 | /* |
286 | * In case of errors we must keep the promise to close FDs | |
287 | * that have been passed in via ->in and ->out. | |
288 | */ | |
289 | ||
e4507ae8 | 290 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 291 | if (need_in) { |
c20181e3 | 292 | if (pipe(fdin) < 0) { |
0ac77ec3 | 293 | failed_errno = errno; |
c20181e3 JS |
294 | if (cmd->out > 0) |
295 | close(cmd->out); | |
939296c4 | 296 | str = "standard input"; |
0ac77ec3 | 297 | goto fail_pipe; |
c20181e3 | 298 | } |
4919bf03 | 299 | cmd->in = fdin[1]; |
4919bf03 SP |
300 | } |
301 | ||
e4507ae8 SP |
302 | need_out = !cmd->no_stdout |
303 | && !cmd->stdout_to_stderr | |
304 | && cmd->out < 0; | |
f4bba25b SP |
305 | if (need_out) { |
306 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 307 | failed_errno = errno; |
f4bba25b SP |
308 | if (need_in) |
309 | close_pair(fdin); | |
c20181e3 JS |
310 | else if (cmd->in) |
311 | close(cmd->in); | |
939296c4 | 312 | str = "standard output"; |
0ac77ec3 | 313 | goto fail_pipe; |
f4bba25b SP |
314 | } |
315 | cmd->out = fdout[0]; | |
f4bba25b SP |
316 | } |
317 | ||
b73a4397 | 318 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
319 | if (need_err) { |
320 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 321 | failed_errno = errno; |
f3b33f1d JS |
322 | if (need_in) |
323 | close_pair(fdin); | |
c20181e3 JS |
324 | else if (cmd->in) |
325 | close(cmd->in); | |
f3b33f1d JS |
326 | if (need_out) |
327 | close_pair(fdout); | |
c20181e3 JS |
328 | else if (cmd->out) |
329 | close(cmd->out); | |
939296c4 | 330 | str = "standard error"; |
0ac77ec3 | 331 | fail_pipe: |
939296c4 SB |
332 | error("cannot create %s pipe for %s: %s", |
333 | str, cmd->argv[0], strerror(failed_errno)); | |
c460c0ec | 334 | argv_array_clear(&cmd->args); |
0ac77ec3 JS |
335 | errno = failed_errno; |
336 | return -1; | |
f3b33f1d JS |
337 | } |
338 | cmd->err = fderr[0]; | |
339 | } | |
340 | ||
8852f5d7 | 341 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
13af8cbd | 342 | fflush(NULL); |
8852f5d7 | 343 | |
380395d0 | 344 | #ifndef GIT_WINDOWS_NATIVE |
2b541bf8 JS |
345 | { |
346 | int notify_pipe[2]; | |
347 | if (pipe(notify_pipe)) | |
348 | notify_pipe[0] = notify_pipe[1] = -1; | |
349 | ||
ebcb5d16 | 350 | cmd->pid = fork(); |
25043d8a | 351 | failed_errno = errno; |
ebcb5d16 | 352 | if (!cmd->pid) { |
a5487ddf JS |
353 | /* |
354 | * Redirect the channel to write syscall error messages to | |
355 | * before redirecting the process's stderr so that all die() | |
356 | * in subsequent call paths use the parent's stderr. | |
357 | */ | |
358 | if (cmd->no_stderr || need_err) { | |
359 | child_err = dup(2); | |
360 | set_cloexec(child_err); | |
361 | } | |
362 | set_die_routine(die_child); | |
3bc4181f | 363 | set_error_routine(error_child); |
a5487ddf | 364 | |
2b541bf8 JS |
365 | close(notify_pipe[0]); |
366 | set_cloexec(notify_pipe[1]); | |
367 | child_notifier = notify_pipe[1]; | |
368 | atexit(notify_parent); | |
369 | ||
e4507ae8 SP |
370 | if (cmd->no_stdin) |
371 | dup_devnull(0); | |
372 | else if (need_in) { | |
4919bf03 | 373 | dup2(fdin[0], 0); |
9dc09c76 | 374 | close_pair(fdin); |
4919bf03 SP |
375 | } else if (cmd->in) { |
376 | dup2(cmd->in, 0); | |
377 | close(cmd->in); | |
95d3c4f5 | 378 | } |
4919bf03 | 379 | |
ce2cf27a CC |
380 | if (cmd->no_stderr) |
381 | dup_devnull(2); | |
382 | else if (need_err) { | |
383 | dup2(fderr[1], 2); | |
384 | close_pair(fderr); | |
4f41b611 SP |
385 | } else if (cmd->err > 1) { |
386 | dup2(cmd->err, 2); | |
387 | close(cmd->err); | |
ce2cf27a CC |
388 | } |
389 | ||
e4507ae8 SP |
390 | if (cmd->no_stdout) |
391 | dup_devnull(1); | |
392 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 393 | dup2(2, 1); |
f4bba25b SP |
394 | else if (need_out) { |
395 | dup2(fdout[1], 1); | |
396 | close_pair(fdout); | |
397 | } else if (cmd->out > 1) { | |
398 | dup2(cmd->out, 1); | |
399 | close(cmd->out); | |
400 | } | |
401 | ||
1568fea0 | 402 | if (cmd->dir && chdir(cmd->dir)) |
d824cbba TR |
403 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
404 | cmd->dir); | |
ee493148 | 405 | if (cmd->env) { |
3427b375 AR |
406 | for (; *cmd->env; cmd->env++) { |
407 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 408 | putenv((char *)*cmd->env); |
3427b375 AR |
409 | else |
410 | unsetenv(*cmd->env); | |
411 | } | |
ee493148 | 412 | } |
5a50085c | 413 | if (cmd->git_cmd) |
f1000898 | 414 | execv_git_cmd(cmd->argv); |
5a50085c | 415 | else if (cmd->use_shell) |
8dba1e63 | 416 | execv_shell_cmd(cmd->argv); |
5a50085c | 417 | else |
38f865c2 | 418 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); |
fc1b56f0 CB |
419 | if (errno == ENOENT) { |
420 | if (!cmd->silent_exec_failure) | |
421 | error("cannot run %s: %s", cmd->argv[0], | |
422 | strerror(ENOENT)); | |
a5487ddf | 423 | exit(127); |
fc1b56f0 | 424 | } else { |
a5487ddf | 425 | die_errno("cannot exec '%s'", cmd->argv[0]); |
fc1b56f0 | 426 | } |
b1bf95bb | 427 | } |
0ac77ec3 JS |
428 | if (cmd->pid < 0) |
429 | error("cannot fork() for %s: %s", cmd->argv[0], | |
25043d8a | 430 | strerror(errno)); |
afe19ff7 JK |
431 | else if (cmd->clean_on_exit) |
432 | mark_child_for_cleanup(cmd->pid); | |
2b541bf8 JS |
433 | |
434 | /* | |
435 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
436 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
437 | * child process sends a single byte. | |
438 | * Note that use of this infrastructure is completely advisory, | |
439 | * therefore, we keep error checks minimal. | |
440 | */ | |
441 | close(notify_pipe[1]); | |
442 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
443 | /* | |
444 | * At this point we know that fork() succeeded, but execvp() | |
445 | * failed. Errors have been reported to our stderr. | |
446 | */ | |
13274526 | 447 | wait_or_whine(cmd->pid, cmd->argv[0]); |
2b541bf8 JS |
448 | failed_errno = errno; |
449 | cmd->pid = -1; | |
450 | } | |
451 | close(notify_pipe[0]); | |
452 | } | |
ba26f296 | 453 | #else |
0d30ad71 | 454 | { |
75301f90 | 455 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 456 | const char **sargv = cmd->argv; |
ba26f296 | 457 | char **env = environ; |
ba26f296 | 458 | |
75301f90 JS |
459 | if (cmd->no_stdin) |
460 | fhin = open("/dev/null", O_RDWR); | |
461 | else if (need_in) | |
462 | fhin = dup(fdin[0]); | |
463 | else if (cmd->in) | |
464 | fhin = dup(cmd->in); | |
465 | ||
466 | if (cmd->no_stderr) | |
467 | fherr = open("/dev/null", O_RDWR); | |
468 | else if (need_err) | |
469 | fherr = dup(fderr[1]); | |
76d44c8c JH |
470 | else if (cmd->err > 2) |
471 | fherr = dup(cmd->err); | |
75301f90 JS |
472 | |
473 | if (cmd->no_stdout) | |
474 | fhout = open("/dev/null", O_RDWR); | |
475 | else if (cmd->stdout_to_stderr) | |
476 | fhout = dup(fherr); | |
477 | else if (need_out) | |
478 | fhout = dup(fdout[1]); | |
479 | else if (cmd->out > 1) | |
480 | fhout = dup(cmd->out); | |
ba26f296 | 481 | |
2affea41 JS |
482 | if (cmd->env) |
483 | env = make_augmented_environ(cmd->env); | |
ba26f296 | 484 | |
5a50085c | 485 | if (cmd->git_cmd) |
108ac313 | 486 | cmd->argv = prepare_git_cmd(cmd->argv); |
5a50085c | 487 | else if (cmd->use_shell) |
8dba1e63 | 488 | cmd->argv = prepare_shell_cmd(cmd->argv); |
ba26f296 | 489 | |
f9a2743c | 490 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir, |
75301f90 | 491 | fhin, fhout, fherr); |
0ac77ec3 | 492 | failed_errno = errno; |
c024beb5 | 493 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
0ac77ec3 | 494 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); |
afe19ff7 JK |
495 | if (cmd->clean_on_exit && cmd->pid >= 0) |
496 | mark_child_for_cleanup(cmd->pid); | |
ba26f296 JS |
497 | |
498 | if (cmd->env) | |
499 | free_environ(env); | |
500 | if (cmd->git_cmd) | |
108ac313 | 501 | free(cmd->argv); |
ba26f296 | 502 | |
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); | |
c460c0ec | 526 | argv_array_clear(&cmd->args); |
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 | { | |
c460c0ec JK |
551 | int ret = wait_or_whine(cmd->pid, cmd->argv[0]); |
552 | argv_array_clear(&cmd->args); | |
553 | return ret; | |
2d22c208 JS |
554 | } |
555 | ||
ebcb5d16 SP |
556 | int run_command(struct child_process *cmd) |
557 | { | |
558 | int code = start_command(cmd); | |
559 | if (code) | |
560 | return code; | |
561 | return finish_command(cmd); | |
562 | } | |
563 | ||
1568fea0 | 564 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
565 | const char **argv, |
566 | int opt) | |
1568fea0 AR |
567 | { |
568 | memset(cmd, 0, sizeof(*cmd)); | |
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; | |
c024beb5 | 573 | cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; |
8dba1e63 | 574 | cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; |
10c6cddd | 575 | cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; |
1568fea0 AR |
576 | } |
577 | ||
f1000898 SP |
578 | int run_command_v_opt(const char **argv, int opt) |
579 | { | |
580 | struct child_process cmd; | |
1568fea0 AR |
581 | prepare_run_command_v_opt(&cmd, argv, opt); |
582 | return run_command(&cmd); | |
583 | } | |
584 | ||
ee493148 AR |
585 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
586 | { | |
587 | struct child_process cmd; | |
588 | prepare_run_command_v_opt(&cmd, argv, opt); | |
589 | cmd.dir = dir; | |
590 | cmd.env = env; | |
591 | return run_command(&cmd); | |
592 | } | |
2d22c208 | 593 | |
f6b60983 | 594 | #ifndef NO_PTHREADS |
0ea1c89b JS |
595 | static pthread_t main_thread; |
596 | static int main_thread_set; | |
597 | static pthread_key_t async_key; | |
1ece66bc | 598 | static pthread_key_t async_die_counter; |
0ea1c89b | 599 | |
200a76b7 | 600 | static void *run_thread(void *data) |
618ebe9f JS |
601 | { |
602 | struct async *async = data; | |
f6b60983 | 603 | intptr_t ret; |
0ea1c89b JS |
604 | |
605 | pthread_setspecific(async_key, async); | |
f6b60983 | 606 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 607 | return (void *)ret; |
618ebe9f | 608 | } |
0ea1c89b JS |
609 | |
610 | static NORETURN void die_async(const char *err, va_list params) | |
611 | { | |
612 | vreportf("fatal: ", err, params); | |
613 | ||
614 | if (!pthread_equal(main_thread, pthread_self())) { | |
615 | struct async *async = pthread_getspecific(async_key); | |
616 | if (async->proc_in >= 0) | |
617 | close(async->proc_in); | |
618 | if (async->proc_out >= 0) | |
619 | close(async->proc_out); | |
620 | pthread_exit((void *)128); | |
621 | } | |
622 | ||
623 | exit(128); | |
618ebe9f | 624 | } |
1ece66bc JK |
625 | |
626 | static int async_die_is_recursing(void) | |
627 | { | |
628 | void *ret = pthread_getspecific(async_die_counter); | |
629 | pthread_setspecific(async_die_counter, (void *)1); | |
630 | return ret != NULL; | |
631 | } | |
632 | ||
618ebe9f JS |
633 | #endif |
634 | ||
2d22c208 JS |
635 | int start_async(struct async *async) |
636 | { | |
ae6a5609 EFL |
637 | int need_in, need_out; |
638 | int fdin[2], fdout[2]; | |
639 | int proc_in, proc_out; | |
2d22c208 | 640 | |
ae6a5609 EFL |
641 | need_in = async->in < 0; |
642 | if (need_in) { | |
643 | if (pipe(fdin) < 0) { | |
644 | if (async->out > 0) | |
645 | close(async->out); | |
646 | return error("cannot create pipe: %s", strerror(errno)); | |
647 | } | |
648 | async->in = fdin[1]; | |
649 | } | |
650 | ||
651 | need_out = async->out < 0; | |
652 | if (need_out) { | |
653 | if (pipe(fdout) < 0) { | |
654 | if (need_in) | |
655 | close_pair(fdin); | |
656 | else if (async->in) | |
657 | close(async->in); | |
658 | return error("cannot create pipe: %s", strerror(errno)); | |
659 | } | |
660 | async->out = fdout[0]; | |
661 | } | |
662 | ||
663 | if (need_in) | |
664 | proc_in = fdin[0]; | |
665 | else if (async->in) | |
666 | proc_in = async->in; | |
667 | else | |
668 | proc_in = -1; | |
669 | ||
670 | if (need_out) | |
671 | proc_out = fdout[1]; | |
672 | else if (async->out) | |
673 | proc_out = async->out; | |
674 | else | |
675 | proc_out = -1; | |
2d22c208 | 676 | |
f6b60983 | 677 | #ifdef NO_PTHREADS |
2c3766f0 AM |
678 | /* Flush stdio before fork() to avoid cloning buffers */ |
679 | fflush(NULL); | |
680 | ||
2d22c208 JS |
681 | async->pid = fork(); |
682 | if (async->pid < 0) { | |
683 | error("fork (async) failed: %s", strerror(errno)); | |
ae6a5609 | 684 | goto error; |
2d22c208 JS |
685 | } |
686 | if (!async->pid) { | |
ae6a5609 EFL |
687 | if (need_in) |
688 | close(fdin[1]); | |
689 | if (need_out) | |
690 | close(fdout[0]); | |
691 | exit(!!async->proc(proc_in, proc_out, async->data)); | |
2d22c208 | 692 | } |
ae6a5609 | 693 | |
afe19ff7 JK |
694 | mark_child_for_cleanup(async->pid); |
695 | ||
ae6a5609 EFL |
696 | if (need_in) |
697 | close(fdin[0]); | |
698 | else if (async->in) | |
699 | close(async->in); | |
700 | ||
701 | if (need_out) | |
702 | close(fdout[1]); | |
703 | else if (async->out) | |
704 | close(async->out); | |
618ebe9f | 705 | #else |
0ea1c89b JS |
706 | if (!main_thread_set) { |
707 | /* | |
708 | * We assume that the first time that start_async is called | |
709 | * it is from the main thread. | |
710 | */ | |
711 | main_thread_set = 1; | |
712 | main_thread = pthread_self(); | |
713 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 714 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 715 | set_die_routine(die_async); |
1ece66bc | 716 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
717 | } |
718 | ||
200a76b7 JS |
719 | if (proc_in >= 0) |
720 | set_cloexec(proc_in); | |
721 | if (proc_out >= 0) | |
722 | set_cloexec(proc_out); | |
ae6a5609 EFL |
723 | async->proc_in = proc_in; |
724 | async->proc_out = proc_out; | |
200a76b7 JS |
725 | { |
726 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
727 | if (err) { | |
728 | error("cannot create thread: %s", strerror(err)); | |
729 | goto error; | |
730 | } | |
618ebe9f JS |
731 | } |
732 | #endif | |
2d22c208 | 733 | return 0; |
ae6a5609 EFL |
734 | |
735 | error: | |
736 | if (need_in) | |
737 | close_pair(fdin); | |
738 | else if (async->in) | |
739 | close(async->in); | |
740 | ||
741 | if (need_out) | |
742 | close_pair(fdout); | |
743 | else if (async->out) | |
744 | close(async->out); | |
745 | return -1; | |
2d22c208 JS |
746 | } |
747 | ||
748 | int finish_async(struct async *async) | |
749 | { | |
f6b60983 | 750 | #ifdef NO_PTHREADS |
0398fc34 | 751 | return wait_or_whine(async->pid, "child process"); |
618ebe9f | 752 | #else |
200a76b7 JS |
753 | void *ret = (void *)(intptr_t)(-1); |
754 | ||
755 | if (pthread_join(async->tid, &ret)) | |
756 | error("pthread_join failed"); | |
757 | return (int)(intptr_t)ret; | |
618ebe9f | 758 | #endif |
2d22c208 | 759 | } |
ae98a008 | 760 | |
5a7da2dc AS |
761 | char *find_hook(const char *name) |
762 | { | |
763 | char *path = git_path("hooks/%s", name); | |
764 | if (access(path, X_OK) < 0) | |
765 | path = NULL; | |
766 | ||
767 | return path; | |
768 | } | |
769 | ||
15048f8a | 770 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 SB |
771 | { |
772 | struct child_process hook; | |
5d40a179 | 773 | struct argv_array argv = ARGV_ARRAY_INIT; |
15048f8a | 774 | const char *p; |
ae98a008 | 775 | int ret; |
ae98a008 | 776 | |
5a7da2dc AS |
777 | p = find_hook(name); |
778 | if (!p) | |
cf94ca8e SB |
779 | return 0; |
780 | ||
5a7da2dc AS |
781 | argv_array_push(&argv, p); |
782 | ||
5d40a179 JK |
783 | while ((p = va_arg(args, const char *))) |
784 | argv_array_push(&argv, p); | |
ae98a008 | 785 | |
ae98a008 | 786 | memset(&hook, 0, sizeof(hook)); |
5d40a179 | 787 | hook.argv = argv.argv; |
15048f8a | 788 | hook.env = env; |
ae98a008 SB |
789 | hook.no_stdin = 1; |
790 | hook.stdout_to_stderr = 1; | |
ae98a008 | 791 | |
0ac77ec3 | 792 | ret = run_command(&hook); |
5d40a179 | 793 | argv_array_clear(&argv); |
ae98a008 SB |
794 | return ret; |
795 | } | |
15048f8a BP |
796 | |
797 | int run_hook_le(const char *const *env, const char *name, ...) | |
798 | { | |
799 | va_list args; | |
800 | int ret; | |
801 | ||
802 | va_start(args, name); | |
803 | ret = run_hook_ve(env, name, args); | |
804 | va_end(args); | |
805 | ||
806 | return ret; | |
807 | } | |
808 | ||
809 | int run_hook_with_custom_index(const char *index_file, const char *name, ...) | |
810 | { | |
811 | const char *hook_env[3] = { NULL }; | |
812 | char index[PATH_MAX]; | |
813 | va_list args; | |
814 | int ret; | |
815 | ||
816 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
817 | hook_env[0] = index; | |
818 | ||
819 | va_start(args, name); | |
820 | ret = run_hook_ve(hook_env, name, args); | |
821 | va_end(args); | |
822 | ||
823 | return ret; | |
824 | } |