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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 | |
483bbd4e RS |
7 | void child_process_init(struct child_process *child) |
8 | { | |
9 | memset(child, 0, sizeof(*child)); | |
10 | argv_array_init(&child->args); | |
19a583dc | 11 | argv_array_init(&child->env_array); |
483bbd4e RS |
12 | } |
13 | ||
afe19ff7 JK |
14 | struct child_to_clean { |
15 | pid_t pid; | |
16 | struct child_to_clean *next; | |
17 | }; | |
18 | static struct child_to_clean *children_to_clean; | |
19 | static int installed_child_cleanup_handler; | |
20 | ||
507d7804 | 21 | static void cleanup_children(int sig, int in_signal) |
afe19ff7 JK |
22 | { |
23 | while (children_to_clean) { | |
24 | struct child_to_clean *p = children_to_clean; | |
25 | children_to_clean = p->next; | |
26 | kill(p->pid, sig); | |
507d7804 TI |
27 | if (!in_signal) |
28 | free(p); | |
afe19ff7 JK |
29 | } |
30 | } | |
31 | ||
32 | static void cleanup_children_on_signal(int sig) | |
33 | { | |
507d7804 | 34 | cleanup_children(sig, 1); |
afe19ff7 JK |
35 | sigchain_pop(sig); |
36 | raise(sig); | |
37 | } | |
38 | ||
39 | static void cleanup_children_on_exit(void) | |
40 | { | |
507d7804 | 41 | cleanup_children(SIGTERM, 0); |
afe19ff7 JK |
42 | } |
43 | ||
44 | static void mark_child_for_cleanup(pid_t pid) | |
45 | { | |
46 | struct child_to_clean *p = xmalloc(sizeof(*p)); | |
47 | p->pid = pid; | |
48 | p->next = children_to_clean; | |
49 | children_to_clean = p; | |
50 | ||
51 | if (!installed_child_cleanup_handler) { | |
52 | atexit(cleanup_children_on_exit); | |
53 | sigchain_push_common(cleanup_children_on_signal); | |
54 | installed_child_cleanup_handler = 1; | |
55 | } | |
56 | } | |
57 | ||
58 | static void clear_child_for_cleanup(pid_t pid) | |
59 | { | |
bdee397d | 60 | struct child_to_clean **pp; |
afe19ff7 | 61 | |
bdee397d DG |
62 | for (pp = &children_to_clean; *pp; pp = &(*pp)->next) { |
63 | struct child_to_clean *clean_me = *pp; | |
64 | ||
65 | if (clean_me->pid == pid) { | |
66 | *pp = clean_me->next; | |
67 | free(clean_me); | |
afe19ff7 JK |
68 | return; |
69 | } | |
70 | } | |
71 | } | |
72 | ||
9dc09c76 SP |
73 | static inline void close_pair(int fd[2]) |
74 | { | |
75 | close(fd[0]); | |
76 | close(fd[1]); | |
77 | } | |
78 | ||
380395d0 | 79 | #ifndef GIT_WINDOWS_NATIVE |
e4507ae8 SP |
80 | static inline void dup_devnull(int to) |
81 | { | |
82 | int fd = open("/dev/null", O_RDWR); | |
a77f106c TR |
83 | if (fd < 0) |
84 | die_errno(_("open /dev/null failed")); | |
85 | if (dup2(fd, to) < 0) | |
86 | die_errno(_("dup2(%d,%d) failed"), fd, to); | |
e4507ae8 SP |
87 | close(fd); |
88 | } | |
75301f90 | 89 | #endif |
e4507ae8 | 90 | |
38f865c2 JK |
91 | static char *locate_in_PATH(const char *file) |
92 | { | |
93 | const char *p = getenv("PATH"); | |
94 | struct strbuf buf = STRBUF_INIT; | |
95 | ||
96 | if (!p || !*p) | |
97 | return NULL; | |
98 | ||
99 | while (1) { | |
100 | const char *end = strchrnul(p, ':'); | |
101 | ||
102 | strbuf_reset(&buf); | |
103 | ||
104 | /* POSIX specifies an empty entry as the current directory. */ | |
105 | if (end != p) { | |
106 | strbuf_add(&buf, p, end - p); | |
107 | strbuf_addch(&buf, '/'); | |
108 | } | |
109 | strbuf_addstr(&buf, file); | |
110 | ||
111 | if (!access(buf.buf, F_OK)) | |
112 | return strbuf_detach(&buf, NULL); | |
113 | ||
114 | if (!*end) | |
115 | break; | |
116 | p = end + 1; | |
117 | } | |
118 | ||
119 | strbuf_release(&buf); | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | static int exists_in_PATH(const char *file) | |
124 | { | |
125 | char *r = locate_in_PATH(file); | |
126 | free(r); | |
127 | return r != NULL; | |
128 | } | |
129 | ||
130 | int sane_execvp(const char *file, char * const argv[]) | |
131 | { | |
132 | if (!execvp(file, argv)) | |
133 | return 0; /* cannot happen ;-) */ | |
134 | ||
135 | /* | |
136 | * When a command can't be found because one of the directories | |
137 | * listed in $PATH is unsearchable, execvp reports EACCES, but | |
138 | * careful usability testing (read: analysis of occasional bug | |
139 | * reports) reveals that "No such file or directory" is more | |
140 | * intuitive. | |
141 | * | |
142 | * We avoid commands with "/", because execvp will not do $PATH | |
143 | * lookups in that case. | |
144 | * | |
145 | * The reassignment of EACCES to errno looks like a no-op below, | |
146 | * but we need to protect against exists_in_PATH overwriting errno. | |
147 | */ | |
148 | if (errno == EACCES && !strchr(file, '/')) | |
149 | errno = exists_in_PATH(file) ? EACCES : ENOENT; | |
a7855083 JH |
150 | else if (errno == ENOTDIR && !strchr(file, '/')) |
151 | errno = ENOENT; | |
38f865c2 JK |
152 | return -1; |
153 | } | |
154 | ||
8dba1e63 JK |
155 | static const char **prepare_shell_cmd(const char **argv) |
156 | { | |
157 | int argc, nargc = 0; | |
158 | const char **nargv; | |
159 | ||
160 | for (argc = 0; argv[argc]; argc++) | |
161 | ; /* just counting */ | |
162 | /* +1 for NULL, +3 for "sh -c" plus extra $0 */ | |
163 | nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); | |
164 | ||
165 | if (argc < 1) | |
166 | die("BUG: shell command is empty"); | |
167 | ||
f445644f | 168 | if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
380395d0 | 169 | #ifndef GIT_WINDOWS_NATIVE |
b3e34ddd | 170 | nargv[nargc++] = SHELL_PATH; |
77629754 JS |
171 | #else |
172 | nargv[nargc++] = "sh"; | |
173 | #endif | |
f445644f | 174 | nargv[nargc++] = "-c"; |
8dba1e63 | 175 | |
f445644f JK |
176 | if (argc < 2) |
177 | nargv[nargc++] = argv[0]; | |
178 | else { | |
179 | struct strbuf arg0 = STRBUF_INIT; | |
180 | strbuf_addf(&arg0, "%s \"$@\"", argv[0]); | |
181 | nargv[nargc++] = strbuf_detach(&arg0, NULL); | |
182 | } | |
8dba1e63 JK |
183 | } |
184 | ||
185 | for (argc = 0; argv[argc]; argc++) | |
186 | nargv[nargc++] = argv[argc]; | |
187 | nargv[nargc] = NULL; | |
188 | ||
189 | return nargv; | |
190 | } | |
191 | ||
380395d0 | 192 | #ifndef GIT_WINDOWS_NATIVE |
8dba1e63 JK |
193 | static int execv_shell_cmd(const char **argv) |
194 | { | |
195 | const char **nargv = prepare_shell_cmd(argv); | |
196 | trace_argv_printf(nargv, "trace: exec:"); | |
38f865c2 | 197 | sane_execvp(nargv[0], (char **)nargv); |
8dba1e63 JK |
198 | free(nargv); |
199 | return -1; | |
200 | } | |
201 | #endif | |
202 | ||
380395d0 | 203 | #ifndef GIT_WINDOWS_NATIVE |
a5487ddf | 204 | static int child_err = 2; |
2b541bf8 JS |
205 | static int child_notifier = -1; |
206 | ||
207 | static void notify_parent(void) | |
208 | { | |
a111eb78 JN |
209 | /* |
210 | * execvp failed. If possible, we'd like to let start_command | |
211 | * know, so failures like ENOENT can be handled right away; but | |
212 | * otherwise, finish_command will still report the error. | |
213 | */ | |
214 | xwrite(child_notifier, "", 1); | |
2b541bf8 | 215 | } |
a5487ddf JS |
216 | |
217 | static NORETURN void die_child(const char *err, va_list params) | |
218 | { | |
3bc4181f | 219 | vwritef(child_err, "fatal: ", err, params); |
a5487ddf JS |
220 | exit(128); |
221 | } | |
3bc4181f CB |
222 | |
223 | static void error_child(const char *err, va_list params) | |
224 | { | |
225 | vwritef(child_err, "error: ", err, params); | |
226 | } | |
200a76b7 | 227 | #endif |
a5487ddf JS |
228 | |
229 | static inline void set_cloexec(int fd) | |
230 | { | |
231 | int flags = fcntl(fd, F_GETFD); | |
232 | if (flags >= 0) | |
233 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
234 | } | |
a5487ddf | 235 | |
507d7804 | 236 | static int wait_or_whine(pid_t pid, const char *argv0, int in_signal) |
ab0b41da JS |
237 | { |
238 | int status, code = -1; | |
239 | pid_t waiting; | |
240 | int failed_errno = 0; | |
241 | ||
242 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
243 | ; /* nothing */ | |
507d7804 TI |
244 | if (in_signal) |
245 | return 0; | |
ab0b41da JS |
246 | |
247 | if (waiting < 0) { | |
248 | failed_errno = errno; | |
249 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
250 | } else if (waiting != pid) { | |
251 | error("waitpid is confused (%s)", argv0); | |
252 | } else if (WIFSIGNALED(status)) { | |
253 | code = WTERMSIG(status); | |
a2767c5c JK |
254 | if (code != SIGINT && code != SIGQUIT) |
255 | error("%s died of signal %d", argv0, code); | |
ab0b41da JS |
256 | /* |
257 | * This return value is chosen so that code & 0xff | |
258 | * mimics the exit code that a POSIX shell would report for | |
259 | * a program that died from this signal. | |
260 | */ | |
709ca730 | 261 | code += 128; |
ab0b41da JS |
262 | } else if (WIFEXITED(status)) { |
263 | code = WEXITSTATUS(status); | |
264 | /* | |
265 | * Convert special exit code when execvp failed. | |
266 | */ | |
267 | if (code == 127) { | |
268 | code = -1; | |
269 | failed_errno = ENOENT; | |
ab0b41da JS |
270 | } |
271 | } else { | |
272 | error("waitpid is confused (%s)", argv0); | |
273 | } | |
afe19ff7 JK |
274 | |
275 | clear_child_for_cleanup(pid); | |
276 | ||
ab0b41da JS |
277 | errno = failed_errno; |
278 | return code; | |
279 | } | |
280 | ||
ebcb5d16 | 281 | int start_command(struct child_process *cmd) |
b1bf95bb | 282 | { |
f3b33f1d JS |
283 | int need_in, need_out, need_err; |
284 | int fdin[2], fdout[2], fderr[2]; | |
25043d8a | 285 | int failed_errno; |
939296c4 | 286 | char *str; |
4919bf03 | 287 | |
c460c0ec JK |
288 | if (!cmd->argv) |
289 | cmd->argv = cmd->args.argv; | |
19a583dc RS |
290 | if (!cmd->env) |
291 | cmd->env = cmd->env_array.argv; | |
c460c0ec | 292 | |
c20181e3 JS |
293 | /* |
294 | * In case of errors we must keep the promise to close FDs | |
295 | * that have been passed in via ->in and ->out. | |
296 | */ | |
297 | ||
e4507ae8 | 298 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 299 | if (need_in) { |
c20181e3 | 300 | if (pipe(fdin) < 0) { |
0ac77ec3 | 301 | failed_errno = errno; |
c20181e3 JS |
302 | if (cmd->out > 0) |
303 | close(cmd->out); | |
939296c4 | 304 | str = "standard input"; |
0ac77ec3 | 305 | goto fail_pipe; |
c20181e3 | 306 | } |
4919bf03 | 307 | cmd->in = fdin[1]; |
4919bf03 SP |
308 | } |
309 | ||
e4507ae8 SP |
310 | need_out = !cmd->no_stdout |
311 | && !cmd->stdout_to_stderr | |
312 | && cmd->out < 0; | |
f4bba25b SP |
313 | if (need_out) { |
314 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 315 | failed_errno = errno; |
f4bba25b SP |
316 | if (need_in) |
317 | close_pair(fdin); | |
c20181e3 JS |
318 | else if (cmd->in) |
319 | close(cmd->in); | |
939296c4 | 320 | str = "standard output"; |
0ac77ec3 | 321 | goto fail_pipe; |
f4bba25b SP |
322 | } |
323 | cmd->out = fdout[0]; | |
f4bba25b SP |
324 | } |
325 | ||
b73a4397 | 326 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
327 | if (need_err) { |
328 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 329 | failed_errno = errno; |
f3b33f1d JS |
330 | if (need_in) |
331 | close_pair(fdin); | |
c20181e3 JS |
332 | else if (cmd->in) |
333 | close(cmd->in); | |
f3b33f1d JS |
334 | if (need_out) |
335 | close_pair(fdout); | |
c20181e3 JS |
336 | else if (cmd->out) |
337 | close(cmd->out); | |
939296c4 | 338 | str = "standard error"; |
0ac77ec3 | 339 | fail_pipe: |
939296c4 SB |
340 | error("cannot create %s pipe for %s: %s", |
341 | str, cmd->argv[0], strerror(failed_errno)); | |
c460c0ec | 342 | argv_array_clear(&cmd->args); |
19a583dc | 343 | argv_array_clear(&cmd->env_array); |
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) { | |
368 | child_err = dup(2); | |
369 | set_cloexec(child_err); | |
370 | } | |
371 | set_die_routine(die_child); | |
3bc4181f | 372 | set_error_routine(error_child); |
a5487ddf | 373 | |
2b541bf8 JS |
374 | close(notify_pipe[0]); |
375 | set_cloexec(notify_pipe[1]); | |
376 | child_notifier = notify_pipe[1]; | |
377 | atexit(notify_parent); | |
378 | ||
e4507ae8 SP |
379 | if (cmd->no_stdin) |
380 | dup_devnull(0); | |
381 | else if (need_in) { | |
4919bf03 | 382 | dup2(fdin[0], 0); |
9dc09c76 | 383 | close_pair(fdin); |
4919bf03 SP |
384 | } else if (cmd->in) { |
385 | dup2(cmd->in, 0); | |
386 | close(cmd->in); | |
95d3c4f5 | 387 | } |
4919bf03 | 388 | |
ce2cf27a CC |
389 | if (cmd->no_stderr) |
390 | dup_devnull(2); | |
391 | else if (need_err) { | |
392 | dup2(fderr[1], 2); | |
393 | close_pair(fderr); | |
4f41b611 SP |
394 | } else if (cmd->err > 1) { |
395 | dup2(cmd->err, 2); | |
396 | close(cmd->err); | |
ce2cf27a CC |
397 | } |
398 | ||
e4507ae8 SP |
399 | if (cmd->no_stdout) |
400 | dup_devnull(1); | |
401 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 402 | dup2(2, 1); |
f4bba25b SP |
403 | else if (need_out) { |
404 | dup2(fdout[1], 1); | |
405 | close_pair(fdout); | |
406 | } else if (cmd->out > 1) { | |
407 | dup2(cmd->out, 1); | |
408 | close(cmd->out); | |
409 | } | |
410 | ||
1568fea0 | 411 | if (cmd->dir && chdir(cmd->dir)) |
d824cbba TR |
412 | die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
413 | cmd->dir); | |
ee493148 | 414 | if (cmd->env) { |
3427b375 AR |
415 | for (; *cmd->env; cmd->env++) { |
416 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 417 | putenv((char *)*cmd->env); |
3427b375 AR |
418 | else |
419 | unsetenv(*cmd->env); | |
420 | } | |
ee493148 | 421 | } |
5a50085c | 422 | if (cmd->git_cmd) |
f1000898 | 423 | execv_git_cmd(cmd->argv); |
5a50085c | 424 | else if (cmd->use_shell) |
8dba1e63 | 425 | execv_shell_cmd(cmd->argv); |
5a50085c | 426 | else |
38f865c2 | 427 | sane_execvp(cmd->argv[0], (char *const*) cmd->argv); |
fc1b56f0 CB |
428 | if (errno == ENOENT) { |
429 | if (!cmd->silent_exec_failure) | |
430 | error("cannot run %s: %s", cmd->argv[0], | |
431 | strerror(ENOENT)); | |
a5487ddf | 432 | exit(127); |
fc1b56f0 | 433 | } else { |
a5487ddf | 434 | die_errno("cannot exec '%s'", cmd->argv[0]); |
fc1b56f0 | 435 | } |
b1bf95bb | 436 | } |
0ac77ec3 JS |
437 | if (cmd->pid < 0) |
438 | error("cannot fork() for %s: %s", cmd->argv[0], | |
25043d8a | 439 | strerror(errno)); |
afe19ff7 JK |
440 | else if (cmd->clean_on_exit) |
441 | mark_child_for_cleanup(cmd->pid); | |
2b541bf8 JS |
442 | |
443 | /* | |
444 | * Wait for child's execvp. If the execvp succeeds (or if fork() | |
445 | * failed), EOF is seen immediately by the parent. Otherwise, the | |
446 | * child process sends a single byte. | |
447 | * Note that use of this infrastructure is completely advisory, | |
448 | * therefore, we keep error checks minimal. | |
449 | */ | |
450 | close(notify_pipe[1]); | |
451 | if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { | |
452 | /* | |
453 | * At this point we know that fork() succeeded, but execvp() | |
454 | * failed. Errors have been reported to our stderr. | |
455 | */ | |
507d7804 | 456 | wait_or_whine(cmd->pid, cmd->argv[0], 0); |
2b541bf8 JS |
457 | failed_errno = errno; |
458 | cmd->pid = -1; | |
459 | } | |
460 | close(notify_pipe[0]); | |
461 | } | |
ba26f296 | 462 | #else |
0d30ad71 | 463 | { |
75301f90 | 464 | int fhin = 0, fhout = 1, fherr = 2; |
108ac313 | 465 | const char **sargv = cmd->argv; |
ba26f296 | 466 | |
75301f90 JS |
467 | if (cmd->no_stdin) |
468 | fhin = open("/dev/null", O_RDWR); | |
469 | else if (need_in) | |
470 | fhin = dup(fdin[0]); | |
471 | else if (cmd->in) | |
472 | fhin = dup(cmd->in); | |
473 | ||
474 | if (cmd->no_stderr) | |
475 | fherr = open("/dev/null", O_RDWR); | |
476 | else if (need_err) | |
477 | fherr = dup(fderr[1]); | |
76d44c8c JH |
478 | else if (cmd->err > 2) |
479 | fherr = dup(cmd->err); | |
75301f90 JS |
480 | |
481 | if (cmd->no_stdout) | |
482 | fhout = open("/dev/null", O_RDWR); | |
483 | else if (cmd->stdout_to_stderr) | |
484 | fhout = dup(fherr); | |
485 | else if (need_out) | |
486 | fhout = dup(fdout[1]); | |
487 | else if (cmd->out > 1) | |
488 | fhout = dup(cmd->out); | |
ba26f296 | 489 | |
5a50085c | 490 | if (cmd->git_cmd) |
108ac313 | 491 | cmd->argv = prepare_git_cmd(cmd->argv); |
5a50085c | 492 | else if (cmd->use_shell) |
8dba1e63 | 493 | cmd->argv = prepare_shell_cmd(cmd->argv); |
ba26f296 | 494 | |
77734da2 KB |
495 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env, |
496 | cmd->dir, fhin, fhout, fherr); | |
0ac77ec3 | 497 | failed_errno = errno; |
c024beb5 | 498 | if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
0ac77ec3 | 499 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); |
afe19ff7 JK |
500 | if (cmd->clean_on_exit && cmd->pid >= 0) |
501 | mark_child_for_cleanup(cmd->pid); | |
ba26f296 | 502 | |
ba26f296 | 503 | if (cmd->git_cmd) |
108ac313 | 504 | free(cmd->argv); |
ba26f296 | 505 | |
108ac313 | 506 | cmd->argv = sargv; |
75301f90 JS |
507 | if (fhin != 0) |
508 | close(fhin); | |
509 | if (fhout != 1) | |
510 | close(fhout); | |
511 | if (fherr != 2) | |
512 | close(fherr); | |
0d30ad71 | 513 | } |
ba26f296 JS |
514 | #endif |
515 | ||
516 | if (cmd->pid < 0) { | |
517 | if (need_in) | |
518 | close_pair(fdin); | |
519 | else if (cmd->in) | |
520 | close(cmd->in); | |
521 | if (need_out) | |
522 | close_pair(fdout); | |
523 | else if (cmd->out) | |
524 | close(cmd->out); | |
525 | if (need_err) | |
526 | close_pair(fderr); | |
fc012c28 D |
527 | else if (cmd->err) |
528 | close(cmd->err); | |
c460c0ec | 529 | argv_array_clear(&cmd->args); |
19a583dc | 530 | argv_array_clear(&cmd->env_array); |
0ac77ec3 JS |
531 | errno = failed_errno; |
532 | return -1; | |
ba26f296 | 533 | } |
4919bf03 SP |
534 | |
535 | if (need_in) | |
536 | close(fdin[0]); | |
537 | else if (cmd->in) | |
538 | close(cmd->in); | |
539 | ||
f4bba25b SP |
540 | if (need_out) |
541 | close(fdout[1]); | |
c20181e3 | 542 | else if (cmd->out) |
f4bba25b SP |
543 | close(cmd->out); |
544 | ||
f3b33f1d JS |
545 | if (need_err) |
546 | close(fderr[1]); | |
4f41b611 SP |
547 | else if (cmd->err) |
548 | close(cmd->err); | |
f3b33f1d | 549 | |
ebcb5d16 SP |
550 | return 0; |
551 | } | |
552 | ||
2d22c208 JS |
553 | int finish_command(struct child_process *cmd) |
554 | { | |
507d7804 | 555 | int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0); |
c460c0ec | 556 | argv_array_clear(&cmd->args); |
19a583dc | 557 | argv_array_clear(&cmd->env_array); |
c460c0ec | 558 | return ret; |
2d22c208 JS |
559 | } |
560 | ||
507d7804 TI |
561 | int finish_command_in_signal(struct child_process *cmd) |
562 | { | |
563 | return wait_or_whine(cmd->pid, cmd->argv[0], 1); | |
564 | } | |
565 | ||
566 | ||
ebcb5d16 SP |
567 | int run_command(struct child_process *cmd) |
568 | { | |
c29b3962 JK |
569 | int code; |
570 | ||
571 | if (cmd->out < 0 || cmd->err < 0) | |
572 | die("BUG: run_command with a pipe can cause deadlock"); | |
573 | ||
574 | code = start_command(cmd); | |
ebcb5d16 SP |
575 | if (code) |
576 | return code; | |
577 | return finish_command(cmd); | |
578 | } | |
579 | ||
f1000898 SP |
580 | int run_command_v_opt(const char **argv, int opt) |
581 | { | |
41e9bad7 | 582 | return run_command_v_opt_cd_env(argv, opt, NULL, NULL); |
1568fea0 AR |
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 | { | |
1f87293d RS |
587 | struct child_process cmd = CHILD_PROCESS_INIT; |
588 | cmd.argv = argv; | |
589 | cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
590 | cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
591 | cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
592 | cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; | |
593 | cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0; | |
594 | cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0; | |
ee493148 AR |
595 | cmd.dir = dir; |
596 | cmd.env = env; | |
597 | return run_command(&cmd); | |
598 | } | |
2d22c208 | 599 | |
f6b60983 | 600 | #ifndef NO_PTHREADS |
0ea1c89b JS |
601 | static pthread_t main_thread; |
602 | static int main_thread_set; | |
603 | static pthread_key_t async_key; | |
1ece66bc | 604 | static pthread_key_t async_die_counter; |
0ea1c89b | 605 | |
200a76b7 | 606 | static void *run_thread(void *data) |
618ebe9f JS |
607 | { |
608 | struct async *async = data; | |
f6b60983 | 609 | intptr_t ret; |
0ea1c89b JS |
610 | |
611 | pthread_setspecific(async_key, async); | |
f6b60983 | 612 | ret = async->proc(async->proc_in, async->proc_out, async->data); |
200a76b7 | 613 | return (void *)ret; |
618ebe9f | 614 | } |
0ea1c89b JS |
615 | |
616 | static NORETURN void die_async(const char *err, va_list params) | |
617 | { | |
618 | vreportf("fatal: ", err, params); | |
619 | ||
620 | if (!pthread_equal(main_thread, pthread_self())) { | |
621 | struct async *async = pthread_getspecific(async_key); | |
622 | if (async->proc_in >= 0) | |
623 | close(async->proc_in); | |
624 | if (async->proc_out >= 0) | |
625 | close(async->proc_out); | |
626 | pthread_exit((void *)128); | |
627 | } | |
628 | ||
629 | exit(128); | |
618ebe9f | 630 | } |
1ece66bc JK |
631 | |
632 | static int async_die_is_recursing(void) | |
633 | { | |
634 | void *ret = pthread_getspecific(async_die_counter); | |
635 | pthread_setspecific(async_die_counter, (void *)1); | |
636 | return ret != NULL; | |
637 | } | |
638 | ||
0f4b6db3 EB |
639 | #else |
640 | ||
641 | static struct { | |
642 | void (**handlers)(void); | |
643 | size_t nr; | |
644 | size_t alloc; | |
645 | } git_atexit_hdlrs; | |
646 | ||
647 | static int git_atexit_installed; | |
648 | ||
6066a7ea | 649 | static void git_atexit_dispatch(void) |
0f4b6db3 EB |
650 | { |
651 | size_t i; | |
652 | ||
653 | for (i=git_atexit_hdlrs.nr ; i ; i--) | |
654 | git_atexit_hdlrs.handlers[i-1](); | |
655 | } | |
656 | ||
6066a7ea | 657 | static void git_atexit_clear(void) |
0f4b6db3 EB |
658 | { |
659 | free(git_atexit_hdlrs.handlers); | |
660 | memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs)); | |
661 | git_atexit_installed = 0; | |
662 | } | |
663 | ||
664 | #undef atexit | |
665 | int git_atexit(void (*handler)(void)) | |
666 | { | |
667 | ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc); | |
668 | git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler; | |
669 | if (!git_atexit_installed) { | |
670 | if (atexit(&git_atexit_dispatch)) | |
671 | return -1; | |
672 | git_atexit_installed = 1; | |
673 | } | |
674 | return 0; | |
675 | } | |
676 | #define atexit git_atexit | |
677 | ||
618ebe9f JS |
678 | #endif |
679 | ||
2d22c208 JS |
680 | int start_async(struct async *async) |
681 | { | |
ae6a5609 EFL |
682 | int need_in, need_out; |
683 | int fdin[2], fdout[2]; | |
684 | int proc_in, proc_out; | |
2d22c208 | 685 | |
ae6a5609 EFL |
686 | need_in = async->in < 0; |
687 | if (need_in) { | |
688 | if (pipe(fdin) < 0) { | |
689 | if (async->out > 0) | |
690 | close(async->out); | |
691 | return error("cannot create pipe: %s", strerror(errno)); | |
692 | } | |
693 | async->in = fdin[1]; | |
694 | } | |
695 | ||
696 | need_out = async->out < 0; | |
697 | if (need_out) { | |
698 | if (pipe(fdout) < 0) { | |
699 | if (need_in) | |
700 | close_pair(fdin); | |
701 | else if (async->in) | |
702 | close(async->in); | |
703 | return error("cannot create pipe: %s", strerror(errno)); | |
704 | } | |
705 | async->out = fdout[0]; | |
706 | } | |
707 | ||
708 | if (need_in) | |
709 | proc_in = fdin[0]; | |
710 | else if (async->in) | |
711 | proc_in = async->in; | |
712 | else | |
713 | proc_in = -1; | |
714 | ||
715 | if (need_out) | |
716 | proc_out = fdout[1]; | |
717 | else if (async->out) | |
718 | proc_out = async->out; | |
719 | else | |
720 | proc_out = -1; | |
2d22c208 | 721 | |
f6b60983 | 722 | #ifdef NO_PTHREADS |
2c3766f0 AM |
723 | /* Flush stdio before fork() to avoid cloning buffers */ |
724 | fflush(NULL); | |
725 | ||
2d22c208 JS |
726 | async->pid = fork(); |
727 | if (async->pid < 0) { | |
728 | error("fork (async) failed: %s", strerror(errno)); | |
ae6a5609 | 729 | goto error; |
2d22c208 JS |
730 | } |
731 | if (!async->pid) { | |
ae6a5609 EFL |
732 | if (need_in) |
733 | close(fdin[1]); | |
734 | if (need_out) | |
735 | close(fdout[0]); | |
0f4b6db3 | 736 | git_atexit_clear(); |
ae6a5609 | 737 | exit(!!async->proc(proc_in, proc_out, async->data)); |
2d22c208 | 738 | } |
ae6a5609 | 739 | |
afe19ff7 JK |
740 | mark_child_for_cleanup(async->pid); |
741 | ||
ae6a5609 EFL |
742 | if (need_in) |
743 | close(fdin[0]); | |
744 | else if (async->in) | |
745 | close(async->in); | |
746 | ||
747 | if (need_out) | |
748 | close(fdout[1]); | |
749 | else if (async->out) | |
750 | close(async->out); | |
618ebe9f | 751 | #else |
0ea1c89b JS |
752 | if (!main_thread_set) { |
753 | /* | |
754 | * We assume that the first time that start_async is called | |
755 | * it is from the main thread. | |
756 | */ | |
757 | main_thread_set = 1; | |
758 | main_thread = pthread_self(); | |
759 | pthread_key_create(&async_key, NULL); | |
1ece66bc | 760 | pthread_key_create(&async_die_counter, NULL); |
0ea1c89b | 761 | set_die_routine(die_async); |
1ece66bc | 762 | set_die_is_recursing_routine(async_die_is_recursing); |
0ea1c89b JS |
763 | } |
764 | ||
200a76b7 JS |
765 | if (proc_in >= 0) |
766 | set_cloexec(proc_in); | |
767 | if (proc_out >= 0) | |
768 | set_cloexec(proc_out); | |
ae6a5609 EFL |
769 | async->proc_in = proc_in; |
770 | async->proc_out = proc_out; | |
200a76b7 JS |
771 | { |
772 | int err = pthread_create(&async->tid, NULL, run_thread, async); | |
773 | if (err) { | |
774 | error("cannot create thread: %s", strerror(err)); | |
775 | goto error; | |
776 | } | |
618ebe9f JS |
777 | } |
778 | #endif | |
2d22c208 | 779 | return 0; |
ae6a5609 EFL |
780 | |
781 | error: | |
782 | if (need_in) | |
783 | close_pair(fdin); | |
784 | else if (async->in) | |
785 | close(async->in); | |
786 | ||
787 | if (need_out) | |
788 | close_pair(fdout); | |
789 | else if (async->out) | |
790 | close(async->out); | |
791 | return -1; | |
2d22c208 JS |
792 | } |
793 | ||
794 | int finish_async(struct async *async) | |
795 | { | |
f6b60983 | 796 | #ifdef NO_PTHREADS |
507d7804 | 797 | return wait_or_whine(async->pid, "child process", 0); |
618ebe9f | 798 | #else |
200a76b7 JS |
799 | void *ret = (void *)(intptr_t)(-1); |
800 | ||
801 | if (pthread_join(async->tid, &ret)) | |
802 | error("pthread_join failed"); | |
803 | return (int)(intptr_t)ret; | |
618ebe9f | 804 | #endif |
2d22c208 | 805 | } |
ae98a008 | 806 | |
dcf69262 | 807 | const char *find_hook(const char *name) |
5a7da2dc | 808 | { |
dcf69262 | 809 | const char *path = git_path("hooks/%s", name); |
5a7da2dc AS |
810 | if (access(path, X_OK) < 0) |
811 | path = NULL; | |
812 | ||
813 | return path; | |
814 | } | |
815 | ||
15048f8a | 816 | int run_hook_ve(const char *const *env, const char *name, va_list args) |
ae98a008 | 817 | { |
d3180279 | 818 | struct child_process hook = CHILD_PROCESS_INIT; |
15048f8a | 819 | const char *p; |
ae98a008 | 820 | |
5a7da2dc AS |
821 | p = find_hook(name); |
822 | if (!p) | |
cf94ca8e SB |
823 | return 0; |
824 | ||
d1d09456 RS |
825 | argv_array_push(&hook.args, p); |
826 | while ((p = va_arg(args, const char *))) | |
827 | argv_array_push(&hook.args, p); | |
15048f8a | 828 | hook.env = env; |
ae98a008 SB |
829 | hook.no_stdin = 1; |
830 | hook.stdout_to_stderr = 1; | |
ae98a008 | 831 | |
d1d09456 | 832 | return run_command(&hook); |
ae98a008 | 833 | } |
15048f8a BP |
834 | |
835 | int run_hook_le(const char *const *env, const char *name, ...) | |
836 | { | |
837 | va_list args; | |
838 | int ret; | |
839 | ||
840 | va_start(args, name); | |
841 | ret = run_hook_ve(env, name, args); | |
842 | va_end(args); | |
843 | ||
844 | return ret; | |
845 | } | |
911ec99b JK |
846 | |
847 | int capture_command(struct child_process *cmd, struct strbuf *buf, size_t hint) | |
848 | { | |
849 | cmd->out = -1; | |
850 | if (start_command(cmd) < 0) | |
851 | return -1; | |
852 | ||
853 | if (strbuf_read(buf, cmd->out, hint) < 0) { | |
854 | close(cmd->out); | |
855 | finish_command(cmd); /* throw away exit code */ | |
856 | return -1; | |
857 | } | |
858 | ||
859 | close(cmd->out); | |
860 | return finish_command(cmd); | |
861 | } |