blob: 3b982e4d55274ebe87c5751fa198bee53e371d9b [file] [log] [blame]
Josef Weidendorferb1bf95b2005-07-31 21:17:43 +02001#include "cache.h"
2#include "run-command.h"
Michal Ostrowski77cb17e2006-01-10 21:12:17 -05003#include "exec_cmd.h"
Jeff Kingafe19ff2012-01-07 12:42:43 +01004#include "sigchain.h"
Jeff King5d40a172011-09-13 17:58:25 -04005#include "argv-array.h"
Josef Weidendorferb1bf95b2005-07-31 21:17:43 +02006
Ben Waltonb3e34dd2012-03-30 21:33:21 -04007#ifndef SHELL_PATH
8# define SHELL_PATH "/bin/sh"
9#endif
10
Jeff Kingafe19ff2012-01-07 12:42:43 +010011struct child_to_clean {
12 pid_t pid;
13 struct child_to_clean *next;
14};
15static struct child_to_clean *children_to_clean;
16static int installed_child_cleanup_handler;
17
18static 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
28static void cleanup_children_on_signal(int sig)
29{
30 cleanup_children(sig);
31 sigchain_pop(sig);
32 raise(sig);
33}
34
35static void cleanup_children_on_exit(void)
36{
37 cleanup_children(SIGTERM);
38}
39
40static 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
54static void clear_child_for_cleanup(pid_t pid)
55{
David Gouldbdee3972012-09-11 15:32:47 +010056 struct child_to_clean **pp;
Jeff Kingafe19ff2012-01-07 12:42:43 +010057
David Gouldbdee3972012-09-11 15:32:47 +010058 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);
Jeff Kingafe19ff2012-01-07 12:42:43 +010064 return;
65 }
66 }
67}
68
Shawn O. Pearce9dc09c72007-03-12 14:37:28 -040069static inline void close_pair(int fd[2])
70{
71 close(fd[0]);
72 close(fd[1]);
73}
74
Johannes Sixt75301f92010-01-15 21:12:18 +010075#ifndef WIN32
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -040076static inline void dup_devnull(int to)
77{
78 int fd = open("/dev/null", O_RDWR);
79 dup2(fd, to);
80 close(fd);
81}
Johannes Sixt75301f92010-01-15 21:12:18 +010082#endif
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -040083
Jeff King38f865c2012-03-30 03:52:18 -040084static char *locate_in_PATH(const char *file)
85{
86 const char *p = getenv("PATH");
87 struct strbuf buf = STRBUF_INIT;
88
89 if (!p || !*p)
90 return NULL;
91
92 while (1) {
93 const char *end = strchrnul(p, ':');
94
95 strbuf_reset(&buf);
96
97 /* POSIX specifies an empty entry as the current directory. */
98 if (end != p) {
99 strbuf_add(&buf, p, end - p);
100 strbuf_addch(&buf, '/');
101 }
102 strbuf_addstr(&buf, file);
103
104 if (!access(buf.buf, F_OK))
105 return strbuf_detach(&buf, NULL);
106
107 if (!*end)
108 break;
109 p = end + 1;
110 }
111
112 strbuf_release(&buf);
113 return NULL;
114}
115
116static int exists_in_PATH(const char *file)
117{
118 char *r = locate_in_PATH(file);
119 free(r);
120 return r != NULL;
121}
122
123int sane_execvp(const char *file, char * const argv[])
124{
125 if (!execvp(file, argv))
126 return 0; /* cannot happen ;-) */
127
128 /*
129 * When a command can't be found because one of the directories
130 * listed in $PATH is unsearchable, execvp reports EACCES, but
131 * careful usability testing (read: analysis of occasional bug
132 * reports) reveals that "No such file or directory" is more
133 * intuitive.
134 *
135 * We avoid commands with "/", because execvp will not do $PATH
136 * lookups in that case.
137 *
138 * The reassignment of EACCES to errno looks like a no-op below,
139 * but we need to protect against exists_in_PATH overwriting errno.
140 */
141 if (errno == EACCES && !strchr(file, '/'))
142 errno = exists_in_PATH(file) ? EACCES : ENOENT;
Junio C Hamanoa7855082012-07-31 12:51:30 -0700143 else if (errno == ENOTDIR && !strchr(file, '/'))
144 errno = ENOENT;
Jeff King38f865c2012-03-30 03:52:18 -0400145 return -1;
146}
147
Jeff King8dba1e62009-12-30 05:53:16 -0500148static const char **prepare_shell_cmd(const char **argv)
149{
150 int argc, nargc = 0;
151 const char **nargv;
152
153 for (argc = 0; argv[argc]; argc++)
154 ; /* just counting */
155 /* +1 for NULL, +3 for "sh -c" plus extra $0 */
156 nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
157
158 if (argc < 1)
159 die("BUG: shell command is empty");
160
Jeff Kingf4456442009-12-30 05:55:36 -0500161 if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
Johannes Sixt77629752012-04-17 09:03:21 +0200162#ifndef WIN32
Ben Waltonb3e34dd2012-03-30 21:33:21 -0400163 nargv[nargc++] = SHELL_PATH;
Johannes Sixt77629752012-04-17 09:03:21 +0200164#else
165 nargv[nargc++] = "sh";
166#endif
Jeff Kingf4456442009-12-30 05:55:36 -0500167 nargv[nargc++] = "-c";
Jeff King8dba1e62009-12-30 05:53:16 -0500168
Jeff Kingf4456442009-12-30 05:55:36 -0500169 if (argc < 2)
170 nargv[nargc++] = argv[0];
171 else {
172 struct strbuf arg0 = STRBUF_INIT;
173 strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
174 nargv[nargc++] = strbuf_detach(&arg0, NULL);
175 }
Jeff King8dba1e62009-12-30 05:53:16 -0500176 }
177
178 for (argc = 0; argv[argc]; argc++)
179 nargv[nargc++] = argv[argc];
180 nargv[nargc] = NULL;
181
182 return nargv;
183}
184
185#ifndef WIN32
186static int execv_shell_cmd(const char **argv)
187{
188 const char **nargv = prepare_shell_cmd(argv);
189 trace_argv_printf(nargv, "trace: exec:");
Jeff King38f865c2012-03-30 03:52:18 -0400190 sane_execvp(nargv[0], (char **)nargv);
Jeff King8dba1e62009-12-30 05:53:16 -0500191 free(nargv);
192 return -1;
193}
194#endif
195
Johannes Sixta5487dd2010-01-10 14:07:52 +0100196#ifndef WIN32
197static int child_err = 2;
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100198static int child_notifier = -1;
199
200static void notify_parent(void)
201{
Jonathan Niedera111eb72011-04-20 05:40:05 -0500202 /*
203 * execvp failed. If possible, we'd like to let start_command
204 * know, so failures like ENOENT can be handled right away; but
205 * otherwise, finish_command will still report the error.
206 */
207 xwrite(child_notifier, "", 1);
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100208}
Johannes Sixta5487dd2010-01-10 14:07:52 +0100209
210static NORETURN void die_child(const char *err, va_list params)
211{
Clemens Buchacher3bc41812011-07-27 23:32:34 +0200212 vwritef(child_err, "fatal: ", err, params);
Johannes Sixta5487dd2010-01-10 14:07:52 +0100213 exit(128);
214}
Clemens Buchacher3bc41812011-07-27 23:32:34 +0200215
216static void error_child(const char *err, va_list params)
217{
218 vwritef(child_err, "error: ", err, params);
219}
Johannes Sixt200a76b2010-03-06 16:40:42 +0100220#endif
Johannes Sixta5487dd2010-01-10 14:07:52 +0100221
222static inline void set_cloexec(int fd)
223{
224 int flags = fcntl(fd, F_GETFD);
225 if (flags >= 0)
226 fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
227}
Johannes Sixta5487dd2010-01-10 14:07:52 +0100228
Johannes Sixtab0b41d2010-01-10 14:08:45 +0100229static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
230{
231 int status, code = -1;
232 pid_t waiting;
233 int failed_errno = 0;
234
235 while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
236 ; /* nothing */
237
238 if (waiting < 0) {
239 failed_errno = errno;
240 error("waitpid for %s failed: %s", argv0, strerror(errno));
241 } else if (waiting != pid) {
242 error("waitpid is confused (%s)", argv0);
243 } else if (WIFSIGNALED(status)) {
244 code = WTERMSIG(status);
245 error("%s died of signal %d", argv0, code);
246 /*
247 * This return value is chosen so that code & 0xff
248 * mimics the exit code that a POSIX shell would report for
249 * a program that died from this signal.
250 */
251 code -= 128;
252 } else if (WIFEXITED(status)) {
253 code = WEXITSTATUS(status);
254 /*
255 * Convert special exit code when execvp failed.
256 */
257 if (code == 127) {
258 code = -1;
259 failed_errno = ENOENT;
Johannes Sixtab0b41d2010-01-10 14:08:45 +0100260 }
261 } else {
262 error("waitpid is confused (%s)", argv0);
263 }
Jeff Kingafe19ff2012-01-07 12:42:43 +0100264
265 clear_child_for_cleanup(pid);
266
Johannes Sixtab0b41d2010-01-10 14:08:45 +0100267 errno = failed_errno;
268 return code;
269}
270
Shawn O. Pearceebcb5d12007-03-10 03:28:05 -0500271int start_command(struct child_process *cmd)
Josef Weidendorferb1bf95b2005-07-31 21:17:43 +0200272{
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200273 int need_in, need_out, need_err;
274 int fdin[2], fdout[2], fderr[2];
David Soria Parra5a7a3672009-08-04 11:28:40 +0200275 int failed_errno = failed_errno;
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500276
Johannes Sixtc20181e2008-02-21 23:42:56 +0100277 /*
278 * In case of errors we must keep the promise to close FDs
279 * that have been passed in via ->in and ->out.
280 */
281
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -0400282 need_in = !cmd->no_stdin && cmd->in < 0;
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500283 if (need_in) {
Johannes Sixtc20181e2008-02-21 23:42:56 +0100284 if (pipe(fdin) < 0) {
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200285 failed_errno = errno;
Johannes Sixtc20181e2008-02-21 23:42:56 +0100286 if (cmd->out > 0)
287 close(cmd->out);
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200288 goto fail_pipe;
Johannes Sixtc20181e2008-02-21 23:42:56 +0100289 }
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500290 cmd->in = fdin[1];
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500291 }
292
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -0400293 need_out = !cmd->no_stdout
294 && !cmd->stdout_to_stderr
295 && cmd->out < 0;
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400296 if (need_out) {
297 if (pipe(fdout) < 0) {
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200298 failed_errno = errno;
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400299 if (need_in)
300 close_pair(fdin);
Johannes Sixtc20181e2008-02-21 23:42:56 +0100301 else if (cmd->in)
302 close(cmd->in);
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200303 goto fail_pipe;
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400304 }
305 cmd->out = fdout[0];
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400306 }
307
Shawn O. Pearceb73a4392007-11-11 02:29:37 -0500308 need_err = !cmd->no_stderr && cmd->err < 0;
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200309 if (need_err) {
310 if (pipe(fderr) < 0) {
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200311 failed_errno = errno;
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200312 if (need_in)
313 close_pair(fdin);
Johannes Sixtc20181e2008-02-21 23:42:56 +0100314 else if (cmd->in)
315 close(cmd->in);
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200316 if (need_out)
317 close_pair(fdout);
Johannes Sixtc20181e2008-02-21 23:42:56 +0100318 else if (cmd->out)
319 close(cmd->out);
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200320fail_pipe:
321 error("cannot create pipe for %s: %s",
322 cmd->argv[0], strerror(failed_errno));
323 errno = failed_errno;
324 return -1;
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200325 }
326 cmd->err = fderr[0];
327 }
328
Johannes Schindelin8852f5d2008-07-07 14:41:34 +0100329 trace_argv_printf(cmd->argv, "trace: run_command:");
Johannes Sixt13af8cb2011-02-04 09:41:58 +0100330 fflush(NULL);
Johannes Schindelin8852f5d2008-07-07 14:41:34 +0100331
Frank Li71064e32009-09-16 10:20:22 +0200332#ifndef WIN32
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100333{
334 int notify_pipe[2];
335 if (pipe(notify_pipe))
336 notify_pipe[0] = notify_pipe[1] = -1;
337
Shawn O. Pearceebcb5d12007-03-10 03:28:05 -0500338 cmd->pid = fork();
Shawn O. Pearceebcb5d12007-03-10 03:28:05 -0500339 if (!cmd->pid) {
Johannes Sixta5487dd2010-01-10 14:07:52 +0100340 /*
341 * Redirect the channel to write syscall error messages to
342 * before redirecting the process's stderr so that all die()
343 * in subsequent call paths use the parent's stderr.
344 */
345 if (cmd->no_stderr || need_err) {
346 child_err = dup(2);
347 set_cloexec(child_err);
348 }
349 set_die_routine(die_child);
Clemens Buchacher3bc41812011-07-27 23:32:34 +0200350 set_error_routine(error_child);
Johannes Sixta5487dd2010-01-10 14:07:52 +0100351
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100352 close(notify_pipe[0]);
353 set_cloexec(notify_pipe[1]);
354 child_notifier = notify_pipe[1];
355 atexit(notify_parent);
356
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -0400357 if (cmd->no_stdin)
358 dup_devnull(0);
359 else if (need_in) {
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500360 dup2(fdin[0], 0);
Shawn O. Pearce9dc09c72007-03-12 14:37:28 -0400361 close_pair(fdin);
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500362 } else if (cmd->in) {
363 dup2(cmd->in, 0);
364 close(cmd->in);
Shawn O. Pearce95d3c4f2006-12-30 21:55:22 -0500365 }
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500366
Christian Couderce2cf272008-03-05 08:35:16 +0100367 if (cmd->no_stderr)
368 dup_devnull(2);
369 else if (need_err) {
370 dup2(fderr[1], 2);
371 close_pair(fderr);
Shawn O. Pearce4f41b612010-02-05 12:57:37 -0800372 } else if (cmd->err > 1) {
373 dup2(cmd->err, 2);
374 close(cmd->err);
Christian Couderce2cf272008-03-05 08:35:16 +0100375 }
376
Shawn O. Pearcee4507ae2007-03-12 14:37:55 -0400377 if (cmd->no_stdout)
378 dup_devnull(1);
379 else if (cmd->stdout_to_stderr)
Shawn O. Pearcecd83c742006-12-30 21:55:19 -0500380 dup2(2, 1);
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400381 else if (need_out) {
382 dup2(fdout[1], 1);
383 close_pair(fdout);
384 } else if (cmd->out > 1) {
385 dup2(cmd->out, 1);
386 close(cmd->out);
387 }
388
Alex Riesen1568fea2007-05-22 23:48:23 +0200389 if (cmd->dir && chdir(cmd->dir))
Thomas Rastd824cbb2009-06-27 17:58:46 +0200390 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
391 cmd->dir);
Alex Riesenee493142007-05-22 23:48:47 +0200392 if (cmd->env) {
Alex Riesen3427b372007-05-23 22:21:39 +0200393 for (; *cmd->env; cmd->env++) {
394 if (strchr(*cmd->env, '='))
Felipe Contreras4b25d092009-05-01 12:06:36 +0300395 putenv((char *)*cmd->env);
Alex Riesen3427b372007-05-23 22:21:39 +0200396 else
397 unsetenv(*cmd->env);
398 }
Alex Riesenee493142007-05-22 23:48:47 +0200399 }
Shawn O. Pearcef1000892007-03-10 03:28:00 -0500400 if (cmd->git_cmd) {
401 execv_git_cmd(cmd->argv);
Jeff King8dba1e62009-12-30 05:53:16 -0500402 } else if (cmd->use_shell) {
403 execv_shell_cmd(cmd->argv);
Michal Ostrowski77cb17e2006-01-10 21:12:17 -0500404 } else {
Jeff King38f865c2012-03-30 03:52:18 -0400405 sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
Michal Ostrowski77cb17e2006-01-10 21:12:17 -0500406 }
Clemens Buchacherfc1b56f2011-08-01 19:59:21 +0200407 if (errno == ENOENT) {
408 if (!cmd->silent_exec_failure)
409 error("cannot run %s: %s", cmd->argv[0],
410 strerror(ENOENT));
Johannes Sixta5487dd2010-01-10 14:07:52 +0100411 exit(127);
Clemens Buchacherfc1b56f2011-08-01 19:59:21 +0200412 } else {
Johannes Sixta5487dd2010-01-10 14:07:52 +0100413 die_errno("cannot exec '%s'", cmd->argv[0]);
Clemens Buchacherfc1b56f2011-08-01 19:59:21 +0200414 }
Josef Weidendorferb1bf95b2005-07-31 21:17:43 +0200415 }
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200416 if (cmd->pid < 0)
417 error("cannot fork() for %s: %s", cmd->argv[0],
418 strerror(failed_errno = errno));
Jeff Kingafe19ff2012-01-07 12:42:43 +0100419 else if (cmd->clean_on_exit)
420 mark_child_for_cleanup(cmd->pid);
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100421
422 /*
423 * Wait for child's execvp. If the execvp succeeds (or if fork()
424 * failed), EOF is seen immediately by the parent. Otherwise, the
425 * child process sends a single byte.
426 * Note that use of this infrastructure is completely advisory,
427 * therefore, we keep error checks minimal.
428 */
429 close(notify_pipe[1]);
430 if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
431 /*
432 * At this point we know that fork() succeeded, but execvp()
433 * failed. Errors have been reported to our stderr.
434 */
435 wait_or_whine(cmd->pid, cmd->argv[0],
436 cmd->silent_exec_failure);
437 failed_errno = errno;
438 cmd->pid = -1;
439 }
440 close(notify_pipe[0]);
Jeff Kingafe19ff2012-01-07 12:42:43 +0100441
Johannes Sixt2b541bf2010-01-10 14:11:22 +0100442}
Johannes Sixtba26f292007-12-07 22:08:59 +0100443#else
Frank Li0d30ad72009-09-16 10:20:17 +0200444{
Johannes Sixt75301f92010-01-15 21:12:18 +0100445 int fhin = 0, fhout = 1, fherr = 2;
Steffen Prohaska108ac312008-07-28 07:50:28 +0200446 const char **sargv = cmd->argv;
Johannes Sixtba26f292007-12-07 22:08:59 +0100447 char **env = environ;
Johannes Sixtba26f292007-12-07 22:08:59 +0100448
Johannes Sixt75301f92010-01-15 21:12:18 +0100449 if (cmd->no_stdin)
450 fhin = open("/dev/null", O_RDWR);
451 else if (need_in)
452 fhin = dup(fdin[0]);
453 else if (cmd->in)
454 fhin = dup(cmd->in);
Johannes Sixtba26f292007-12-07 22:08:59 +0100455
Johannes Sixt75301f92010-01-15 21:12:18 +0100456 if (cmd->no_stderr)
457 fherr = open("/dev/null", O_RDWR);
458 else if (need_err)
459 fherr = dup(fderr[1]);
Junio C Hamano76d44c82010-02-05 21:08:53 -0800460 else if (cmd->err > 2)
461 fherr = dup(cmd->err);
Johannes Sixtba26f292007-12-07 22:08:59 +0100462
Johannes Sixt75301f92010-01-15 21:12:18 +0100463 if (cmd->no_stdout)
464 fhout = open("/dev/null", O_RDWR);
465 else if (cmd->stdout_to_stderr)
466 fhout = dup(fherr);
467 else if (need_out)
468 fhout = dup(fdout[1]);
469 else if (cmd->out > 1)
470 fhout = dup(cmd->out);
Johannes Sixtba26f292007-12-07 22:08:59 +0100471
Johannes Sixt2affea42009-09-11 19:40:08 +0200472 if (cmd->env)
473 env = make_augmented_environ(cmd->env);
Johannes Sixtba26f292007-12-07 22:08:59 +0100474
475 if (cmd->git_cmd) {
Steffen Prohaska108ac312008-07-28 07:50:28 +0200476 cmd->argv = prepare_git_cmd(cmd->argv);
Jeff King8dba1e62009-12-30 05:53:16 -0500477 } else if (cmd->use_shell) {
478 cmd->argv = prepare_shell_cmd(cmd->argv);
Johannes Sixtba26f292007-12-07 22:08:59 +0100479 }
480
Johannes Sixtf9a27432010-04-11 22:40:12 +0200481 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir,
Johannes Sixt75301f92010-01-15 21:12:18 +0100482 fhin, fhout, fherr);
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200483 failed_errno = errno;
Johannes Sixtc024beb2009-07-04 21:26:42 +0200484 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200485 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
Jeff Kingafe19ff2012-01-07 12:42:43 +0100486 if (cmd->clean_on_exit && cmd->pid >= 0)
487 mark_child_for_cleanup(cmd->pid);
Johannes Sixtba26f292007-12-07 22:08:59 +0100488
489 if (cmd->env)
490 free_environ(env);
491 if (cmd->git_cmd)
Steffen Prohaska108ac312008-07-28 07:50:28 +0200492 free(cmd->argv);
Johannes Sixtba26f292007-12-07 22:08:59 +0100493
Steffen Prohaska108ac312008-07-28 07:50:28 +0200494 cmd->argv = sargv;
Johannes Sixt75301f92010-01-15 21:12:18 +0100495 if (fhin != 0)
496 close(fhin);
497 if (fhout != 1)
498 close(fhout);
499 if (fherr != 2)
500 close(fherr);
Frank Li0d30ad72009-09-16 10:20:17 +0200501}
Johannes Sixtba26f292007-12-07 22:08:59 +0100502#endif
503
504 if (cmd->pid < 0) {
505 if (need_in)
506 close_pair(fdin);
507 else if (cmd->in)
508 close(cmd->in);
509 if (need_out)
510 close_pair(fdout);
511 else if (cmd->out)
512 close(cmd->out);
513 if (need_err)
514 close_pair(fderr);
bert Dvornikfc012c22010-05-20 20:57:52 +0200515 else if (cmd->err)
516 close(cmd->err);
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200517 errno = failed_errno;
518 return -1;
Johannes Sixtba26f292007-12-07 22:08:59 +0100519 }
Shawn O. Pearce4919bf02007-03-10 03:28:08 -0500520
521 if (need_in)
522 close(fdin[0]);
523 else if (cmd->in)
524 close(cmd->in);
525
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400526 if (need_out)
527 close(fdout[1]);
Johannes Sixtc20181e2008-02-21 23:42:56 +0100528 else if (cmd->out)
Shawn O. Pearcef4bba252007-03-12 14:37:45 -0400529 close(cmd->out);
530
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200531 if (need_err)
532 close(fderr[1]);
Shawn O. Pearce4f41b612010-02-05 12:57:37 -0800533 else if (cmd->err)
534 close(cmd->err);
Johannes Sixtf3b33f12007-10-19 21:47:58 +0200535
Shawn O. Pearceebcb5d12007-03-10 03:28:05 -0500536 return 0;
537}
538
Johannes Sixt2d22c202007-10-19 21:48:00 +0200539int finish_command(struct child_process *cmd)
540{
Johannes Sixtc024beb2009-07-04 21:26:42 +0200541 return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
Johannes Sixt2d22c202007-10-19 21:48:00 +0200542}
543
Shawn O. Pearceebcb5d12007-03-10 03:28:05 -0500544int run_command(struct child_process *cmd)
545{
546 int code = start_command(cmd);
547 if (code)
548 return code;
549 return finish_command(cmd);
550}
551
Alex Riesen1568fea2007-05-22 23:48:23 +0200552static void prepare_run_command_v_opt(struct child_process *cmd,
Alex Riesenee493142007-05-22 23:48:47 +0200553 const char **argv,
554 int opt)
Alex Riesen1568fea2007-05-22 23:48:23 +0200555{
556 memset(cmd, 0, sizeof(*cmd));
557 cmd->argv = argv;
558 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
559 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
560 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
Johannes Sixtc024beb2009-07-04 21:26:42 +0200561 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
Jeff King8dba1e62009-12-30 05:53:16 -0500562 cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
Clemens Buchacher10c6cdd2012-01-08 21:41:09 +0100563 cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
Alex Riesen1568fea2007-05-22 23:48:23 +0200564}
565
Shawn O. Pearcef1000892007-03-10 03:28:00 -0500566int run_command_v_opt(const char **argv, int opt)
567{
568 struct child_process cmd;
Alex Riesen1568fea2007-05-22 23:48:23 +0200569 prepare_run_command_v_opt(&cmd, argv, opt);
570 return run_command(&cmd);
571}
572
Alex Riesenee493142007-05-22 23:48:47 +0200573int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
574{
575 struct child_process cmd;
576 prepare_run_command_v_opt(&cmd, argv, opt);
577 cmd.dir = dir;
578 cmd.env = env;
579 return run_command(&cmd);
580}
Johannes Sixt2d22c202007-10-19 21:48:00 +0200581
Johannes Sixtf6b60982010-03-09 21:00:36 +0100582#ifndef NO_PTHREADS
Johannes Sixt0ea1c892010-03-06 16:40:43 +0100583static pthread_t main_thread;
584static int main_thread_set;
585static pthread_key_t async_key;
586
Johannes Sixt200a76b2010-03-06 16:40:42 +0100587static void *run_thread(void *data)
Johannes Sixt618ebe92007-12-08 22:19:14 +0100588{
589 struct async *async = data;
Johannes Sixtf6b60982010-03-09 21:00:36 +0100590 intptr_t ret;
Johannes Sixt0ea1c892010-03-06 16:40:43 +0100591
592 pthread_setspecific(async_key, async);
Johannes Sixtf6b60982010-03-09 21:00:36 +0100593 ret = async->proc(async->proc_in, async->proc_out, async->data);
Johannes Sixt200a76b2010-03-06 16:40:42 +0100594 return (void *)ret;
Johannes Sixt618ebe92007-12-08 22:19:14 +0100595}
Johannes Sixt0ea1c892010-03-06 16:40:43 +0100596
597static NORETURN void die_async(const char *err, va_list params)
598{
599 vreportf("fatal: ", err, params);
600
601 if (!pthread_equal(main_thread, pthread_self())) {
602 struct async *async = pthread_getspecific(async_key);
603 if (async->proc_in >= 0)
604 close(async->proc_in);
605 if (async->proc_out >= 0)
606 close(async->proc_out);
607 pthread_exit((void *)128);
608 }
609
610 exit(128);
Johannes Sixt618ebe92007-12-08 22:19:14 +0100611}
612#endif
613
Johannes Sixt2d22c202007-10-19 21:48:00 +0200614int start_async(struct async *async)
615{
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800616 int need_in, need_out;
617 int fdin[2], fdout[2];
618 int proc_in, proc_out;
Johannes Sixt2d22c202007-10-19 21:48:00 +0200619
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800620 need_in = async->in < 0;
621 if (need_in) {
622 if (pipe(fdin) < 0) {
623 if (async->out > 0)
624 close(async->out);
625 return error("cannot create pipe: %s", strerror(errno));
626 }
627 async->in = fdin[1];
628 }
629
630 need_out = async->out < 0;
631 if (need_out) {
632 if (pipe(fdout) < 0) {
633 if (need_in)
634 close_pair(fdin);
635 else if (async->in)
636 close(async->in);
637 return error("cannot create pipe: %s", strerror(errno));
638 }
639 async->out = fdout[0];
640 }
641
642 if (need_in)
643 proc_in = fdin[0];
644 else if (async->in)
645 proc_in = async->in;
646 else
647 proc_in = -1;
648
649 if (need_out)
650 proc_out = fdout[1];
651 else if (async->out)
652 proc_out = async->out;
653 else
654 proc_out = -1;
Johannes Sixt2d22c202007-10-19 21:48:00 +0200655
Johannes Sixtf6b60982010-03-09 21:00:36 +0100656#ifdef NO_PTHREADS
Anders Melchiorsen2c3766f2008-08-04 02:30:03 +0200657 /* Flush stdio before fork() to avoid cloning buffers */
658 fflush(NULL);
659
Johannes Sixt2d22c202007-10-19 21:48:00 +0200660 async->pid = fork();
661 if (async->pid < 0) {
662 error("fork (async) failed: %s", strerror(errno));
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800663 goto error;
Johannes Sixt2d22c202007-10-19 21:48:00 +0200664 }
665 if (!async->pid) {
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800666 if (need_in)
667 close(fdin[1]);
668 if (need_out)
669 close(fdout[0]);
670 exit(!!async->proc(proc_in, proc_out, async->data));
Johannes Sixt2d22c202007-10-19 21:48:00 +0200671 }
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800672
Jeff Kingafe19ff2012-01-07 12:42:43 +0100673 mark_child_for_cleanup(async->pid);
674
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800675 if (need_in)
676 close(fdin[0]);
677 else if (async->in)
678 close(async->in);
679
680 if (need_out)
681 close(fdout[1]);
682 else if (async->out)
683 close(async->out);
Johannes Sixt618ebe92007-12-08 22:19:14 +0100684#else
Johannes Sixt0ea1c892010-03-06 16:40:43 +0100685 if (!main_thread_set) {
686 /*
687 * We assume that the first time that start_async is called
688 * it is from the main thread.
689 */
690 main_thread_set = 1;
691 main_thread = pthread_self();
692 pthread_key_create(&async_key, NULL);
693 set_die_routine(die_async);
694 }
695
Johannes Sixt200a76b2010-03-06 16:40:42 +0100696 if (proc_in >= 0)
697 set_cloexec(proc_in);
698 if (proc_out >= 0)
699 set_cloexec(proc_out);
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800700 async->proc_in = proc_in;
701 async->proc_out = proc_out;
Johannes Sixt200a76b2010-03-06 16:40:42 +0100702 {
703 int err = pthread_create(&async->tid, NULL, run_thread, async);
704 if (err) {
705 error("cannot create thread: %s", strerror(err));
706 goto error;
707 }
Johannes Sixt618ebe92007-12-08 22:19:14 +0100708 }
709#endif
Johannes Sixt2d22c202007-10-19 21:48:00 +0200710 return 0;
Erik Faye-Lundae6a5602010-02-05 12:57:38 -0800711
712error:
713 if (need_in)
714 close_pair(fdin);
715 else if (async->in)
716 close(async->in);
717
718 if (need_out)
719 close_pair(fdout);
720 else if (async->out)
721 close(async->out);
722 return -1;
Johannes Sixt2d22c202007-10-19 21:48:00 +0200723}
724
725int finish_async(struct async *async)
726{
Johannes Sixtf6b60982010-03-09 21:00:36 +0100727#ifdef NO_PTHREADS
Johannes Sixt200a76b2010-03-06 16:40:42 +0100728 return wait_or_whine(async->pid, "child process", 0);
Johannes Sixt618ebe92007-12-08 22:19:14 +0100729#else
Johannes Sixt200a76b2010-03-06 16:40:42 +0100730 void *ret = (void *)(intptr_t)(-1);
731
732 if (pthread_join(async->tid, &ret))
733 error("pthread_join failed");
734 return (int)(intptr_t)ret;
Johannes Sixt618ebe92007-12-08 22:19:14 +0100735#endif
Johannes Sixt2d22c202007-10-19 21:48:00 +0200736}
Stephan Beyerae98a002009-01-16 20:09:59 +0100737
738int run_hook(const char *index_file, const char *name, ...)
739{
740 struct child_process hook;
Jeff King5d40a172011-09-13 17:58:25 -0400741 struct argv_array argv = ARGV_ARRAY_INIT;
742 const char *p, *env[2];
Stephan Beyerae98a002009-01-16 20:09:59 +0100743 char index[PATH_MAX];
744 va_list args;
745 int ret;
Stephan Beyerae98a002009-01-16 20:09:59 +0100746
Stephan Beyercf94ca82009-01-16 20:10:01 +0100747 if (access(git_path("hooks/%s", name), X_OK) < 0)
748 return 0;
749
Stephan Beyerae98a002009-01-16 20:09:59 +0100750 va_start(args, name);
Jeff King5d40a172011-09-13 17:58:25 -0400751 argv_array_push(&argv, git_path("hooks/%s", name));
752 while ((p = va_arg(args, const char *)))
753 argv_array_push(&argv, p);
Stephan Beyerae98a002009-01-16 20:09:59 +0100754 va_end(args);
755
Stephan Beyerae98a002009-01-16 20:09:59 +0100756 memset(&hook, 0, sizeof(hook));
Jeff King5d40a172011-09-13 17:58:25 -0400757 hook.argv = argv.argv;
Stephan Beyerae98a002009-01-16 20:09:59 +0100758 hook.no_stdin = 1;
759 hook.stdout_to_stderr = 1;
760 if (index_file) {
761 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
762 env[0] = index;
763 env[1] = NULL;
764 hook.env = env;
765 }
766
Johannes Sixt0ac77ec2009-07-04 21:26:40 +0200767 ret = run_command(&hook);
Jeff King5d40a172011-09-13 17:58:25 -0400768 argv_array_clear(&argv);
Stephan Beyerae98a002009-01-16 20:09:59 +0100769 return ret;
770}