run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "exec_cmd.h"
   4 #include "sigchain.h"
   5 #include "argv-array.h"
   6
   7 #ifndef SHELL_PATH
   8 # define SHELL_PATH "/bin/sh"
   9 #endif
  10
  11 void child_process_init(struct child_process *child)
  12 {
  13         memset(child, 0, sizeof(*child));
  14         argv_array_init(&child->args);
  15 }
  16
  17 struct child_to_clean {
  18         pid_t pid;
  19         struct child_to_clean *next;
  20 };
  21 static struct child_to_clean *children_to_clean;
  22 static int installed_child_cleanup_handler;
  23
  24 static void cleanup_children(int sig)
  25 {
  26         while (children_to_clean) {
  27                 struct child_to_clean *p = children_to_clean;
  28                 children_to_clean = p->next;
  29                 kill(p->pid, sig);
  30                 free(p);
  31         }
  32 }
  33
  34 static void cleanup_children_on_signal(int sig)
  35 {
  36         cleanup_children(sig);
  37         sigchain_pop(sig);
  38         raise(sig);
  39 }
  40
  41 static void cleanup_children_on_exit(void)
  42 {
  43         cleanup_children(SIGTERM);
  44 }
  45
  46 static void mark_child_for_cleanup(pid_t pid)
  47 {
  48         struct child_to_clean *p = xmalloc(sizeof(*p));
  49         p->pid = pid;
  50         p->next = children_to_clean;
  51         children_to_clean = p;
  52
  53         if (!installed_child_cleanup_handler) {
  54                 atexit(cleanup_children_on_exit);
  55                 sigchain_push_common(cleanup_children_on_signal);
  56                 installed_child_cleanup_handler = 1;
  57         }
  58 }
  59
  60 static void clear_child_for_cleanup(pid_t pid)
  61 {
  62         struct child_to_clean **pp;
  63
  64         for (pp = &children_to_clean; *pp; pp = &(*pp)->next) {
  65                 struct child_to_clean *clean_me = *pp;
  66
  67                 if (clean_me->pid == pid) {
  68                         *pp = clean_me->next;
  69                         free(clean_me);
  70                         return;
  71                 }
  72         }
  73 }
  74
  75 static inline void close_pair(int fd[2])
  76 {
  77         close(fd[0]);
  78         close(fd[1]);
  79 }
  80
  81 #ifndef GIT_WINDOWS_NATIVE
  82 static inline void dup_devnull(int to)
  83 {
  84         int fd = open("/dev/null", O_RDWR);
  85         if (fd < 0)
  86                 die_errno(_("open /dev/null failed"));
  87         if (dup2(fd, to) < 0)
  88                 die_errno(_("dup2(%d,%d) failed"), fd, to);
  89         close(fd);
  90 }
  91 #endif
  92
  93 static char *locate_in_PATH(const char *file)
  94 {
  95         const char *p = getenv("PATH");
  96         struct strbuf buf = STRBUF_INIT;
  97
  98         if (!p || !*p)
  99                 return NULL;
 100
 101         while (1) {
 102                 const char *end = strchrnul(p, ':');
 103
 104                 strbuf_reset(&buf);
 105
 106                 /* POSIX specifies an empty entry as the current directory. */
 107                 if (end != p) {
 108                         strbuf_add(&buf, p, end - p);
 109                         strbuf_addch(&buf, '/');
 110                 }
 111                 strbuf_addstr(&buf, file);
 112
 113                 if (!access(buf.buf, F_OK))
 114                         return strbuf_detach(&buf, NULL);
 115
 116                 if (!*end)
 117                         break;
 118                 p = end + 1;
 119         }
 120
 121         strbuf_release(&buf);
 122         return NULL;
 123 }
 124
 125 static int exists_in_PATH(const char *file)
 126 {
 127         char *r = locate_in_PATH(file);
 128         free(r);
 129         return r != NULL;
 130 }
 131
 132 int sane_execvp(const char *file, char * const argv[])
 133 {
 134         if (!execvp(file, argv))
 135                 return 0; /* cannot happen ;-) */
 136
 137         /*
 138          * When a command can't be found because one of the directories
 139          * listed in $PATH is unsearchable, execvp reports EACCES, but
 140          * careful usability testing (read: analysis of occasional bug
 141          * reports) reveals that "No such file or directory" is more
 142          * intuitive.
 143          *
 144          * We avoid commands with "/", because execvp will not do $PATH
 145          * lookups in that case.
 146          *
 147          * The reassignment of EACCES to errno looks like a no-op below,
 148          * but we need to protect against exists_in_PATH overwriting errno.
 149          */
 150         if (errno == EACCES && !strchr(file, '/'))
 151                 errno = exists_in_PATH(file) ? EACCES : ENOENT;
 152         else if (errno == ENOTDIR && !strchr(file, '/'))
 153                 errno = ENOENT;
 154         return -1;
 155 }
 156
 157 static const char **prepare_shell_cmd(const char **argv)
 158 {
 159         int argc, nargc = 0;
 160         const char **nargv;
 161
 162         for (argc = 0; argv[argc]; argc++)
 163                 ; /* just counting */
 164         /* +1 for NULL, +3 for "sh -c" plus extra $0 */
 165         nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
 166
 167         if (argc < 1)
 168                 die("BUG: shell command is empty");
 169
 170         if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
 171 #ifndef GIT_WINDOWS_NATIVE
 172                 nargv[nargc++] = SHELL_PATH;
 173 #else
 174                 nargv[nargc++] = "sh";
 175 #endif
 176                 nargv[nargc++] = "-c";
 177
 178                 if (argc < 2)
 179                         nargv[nargc++] = argv[0];
 180                 else {
 181                         struct strbuf arg0 = STRBUF_INIT;
 182                         strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
 183                         nargv[nargc++] = strbuf_detach(&arg0, NULL);
 184                 }
 185         }
 186
 187         for (argc = 0; argv[argc]; argc++)
 188                 nargv[nargc++] = argv[argc];
 189         nargv[nargc] = NULL;
 190
 191         return nargv;
 192 }
 193
 194 #ifndef GIT_WINDOWS_NATIVE
 195 static int execv_shell_cmd(const char **argv)
 196 {
 197         const char **nargv = prepare_shell_cmd(argv);
 198         trace_argv_printf(nargv, "trace: exec:");
 199         sane_execvp(nargv[0], (char **)nargv);
 200         free(nargv);
 201         return -1;
 202 }
 203 #endif
 204
 205 #ifndef GIT_WINDOWS_NATIVE
 206 static int child_err = 2;
 207 static int child_notifier = -1;
 208
 209 static void notify_parent(void)
 210 {
 211         /*
 212          * execvp failed.  If possible, we'd like to let start_command
 213          * know, so failures like ENOENT can be handled right away; but
 214          * otherwise, finish_command will still report the error.
 215          */
 216         xwrite(child_notifier, "", 1);
 217 }
 218
 219 static NORETURN void die_child(const char *err, va_list params)
 220 {
 221         vwritef(child_err, "fatal: ", err, params);
 222         exit(128);
 223 }
 224
 225 static void error_child(const char *err, va_list params)
 226 {
 227         vwritef(child_err, "error: ", err, params);
 228 }
 229 #endif
 230
 231 static inline void set_cloexec(int fd)
 232 {
 233         int flags = fcntl(fd, F_GETFD);
 234         if (flags >= 0)
 235                 fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
 236 }
 237
 238 static int wait_or_whine(pid_t pid, const char *argv0)
 239 {
 240         int status, code = -1;
 241         pid_t waiting;
 242         int failed_errno = 0;
 243
 244         while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
 245                 ;       /* nothing */
 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);
 254                 if (code != SIGINT && code != SIGQUIT)
 255                         error("%s died of signal %d", argv0, code);
 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                  */
 261                 code += 128;
 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;
 270                 }
 271         } else {
 272                 error("waitpid is confused (%s)", argv0);
 273         }
 274
 275         clear_child_for_cleanup(pid);
 276
 277         errno = failed_errno;
 278         return code;
 279 }
 280
 281 int start_command(struct child_process *cmd)
 282 {
 283         int need_in, need_out, need_err;
 284         int fdin[2], fdout[2], fderr[2];
 285         int failed_errno;
 286         char *str;
 287
 288         if (!cmd->argv)
 289                 cmd->argv = cmd->args.argv;
 290
 291         /*
 292          * In case of errors we must keep the promise to close FDs
 293          * that have been passed in via ->in and ->out.
 294          */
 295
 296         need_in = !cmd->no_stdin && cmd->in < 0;
 297         if (need_in) {
 298                 if (pipe(fdin) < 0) {
 299                         failed_errno = errno;
 300                         if (cmd->out > 0)
 301                                 close(cmd->out);
 302                         str = "standard input";
 303                         goto fail_pipe;
 304                 }
 305                 cmd->in = fdin[1];
 306         }
 307
 308         need_out = !cmd->no_stdout
 309                 && !cmd->stdout_to_stderr
 310                 && cmd->out < 0;
 311         if (need_out) {
 312                 if (pipe(fdout) < 0) {
 313                         failed_errno = errno;
 314                         if (need_in)
 315                                 close_pair(fdin);
 316                         else if (cmd->in)
 317                                 close(cmd->in);
 318                         str = "standard output";
 319                         goto fail_pipe;
 320                 }
 321                 cmd->out = fdout[0];
 322         }
 323
 324         need_err = !cmd->no_stderr && cmd->err < 0;
 325         if (need_err) {
 326                 if (pipe(fderr) < 0) {
 327                         failed_errno = errno;
 328                         if (need_in)
 329                                 close_pair(fdin);
 330                         else if (cmd->in)
 331                                 close(cmd->in);
 332                         if (need_out)
 333                                 close_pair(fdout);
 334                         else if (cmd->out)
 335                                 close(cmd->out);
 336                         str = "standard error";
 337 fail_pipe:
 338                         error("cannot create %s pipe for %s: %s",
 339                                 str, cmd->argv[0], strerror(failed_errno));
 340                         argv_array_clear(&cmd->args);
 341                         errno = failed_errno;
 342                         return -1;
 343                 }
 344                 cmd->err = fderr[0];
 345         }
 346
 347         trace_argv_printf(cmd->argv, "trace: run_command:");
 348         fflush(NULL);
 349
 350 #ifndef GIT_WINDOWS_NATIVE
 351 {
 352         int notify_pipe[2];
 353         if (pipe(notify_pipe))
 354                 notify_pipe[0] = notify_pipe[1] = -1;
 355
 356         cmd->pid = fork();
 357         failed_errno = errno;
 358         if (!cmd->pid) {
 359                 /*
 360                  * Redirect the channel to write syscall error messages to
 361                  * before redirecting the process's stderr so that all die()
 362                  * in subsequent call paths use the parent's stderr.
 363                  */
 364                 if (cmd->no_stderr || need_err) {
 365                         child_err = dup(2);
 366                         set_cloexec(child_err);
 367                 }
 368                 set_die_routine(die_child);
 369                 set_error_routine(error_child);
 370
 371                 close(notify_pipe[0]);
 372                 set_cloexec(notify_pipe[1]);
 373                 child_notifier = notify_pipe[1];
 374                 atexit(notify_parent);
 375
 376                 if (cmd->no_stdin)
 377                         dup_devnull(0);
 378                 else if (need_in) {
 379                         dup2(fdin[0], 0);
 380                         close_pair(fdin);
 381                 } else if (cmd->in) {
 382                         dup2(cmd->in, 0);
 383                         close(cmd->in);
 384                 }
 385
 386                 if (cmd->no_stderr)
 387                         dup_devnull(2);
 388                 else if (need_err) {
 389                         dup2(fderr[1], 2);
 390                         close_pair(fderr);
 391                 } else if (cmd->err > 1) {
 392                         dup2(cmd->err, 2);
 393                         close(cmd->err);
 394                 }
 395
 396                 if (cmd->no_stdout)
 397                         dup_devnull(1);
 398                 else if (cmd->stdout_to_stderr)
 399                         dup2(2, 1);
 400                 else if (need_out) {
 401                         dup2(fdout[1], 1);
 402                         close_pair(fdout);
 403                 } else if (cmd->out > 1) {
 404                         dup2(cmd->out, 1);
 405                         close(cmd->out);
 406                 }
 407
 408                 if (cmd->dir && chdir(cmd->dir))
 409                         die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
 410                             cmd->dir);
 411                 if (cmd->env) {
 412                         for (; *cmd->env; cmd->env++) {
 413                                 if (strchr(*cmd->env, '='))
 414                                         putenv((char *)*cmd->env);
 415                                 else
 416                                         unsetenv(*cmd->env);
 417                         }
 418                 }
 419                 if (cmd->git_cmd)
 420                         execv_git_cmd(cmd->argv);
 421                 else if (cmd->use_shell)
 422                         execv_shell_cmd(cmd->argv);
 423                 else
 424                         sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
 425                 if (errno == ENOENT) {
 426                         if (!cmd->silent_exec_failure)
 427                                 error("cannot run %s: %s", cmd->argv[0],
 428                                         strerror(ENOENT));
 429                         exit(127);
 430                 } else {
 431                         die_errno("cannot exec '%s'", cmd->argv[0]);
 432                 }
 433         }
 434         if (cmd->pid < 0)
 435                 error("cannot fork() for %s: %s", cmd->argv[0],
 436                         strerror(errno));
 437         else if (cmd->clean_on_exit)
 438                 mark_child_for_cleanup(cmd->pid);
 439
 440         /*
 441          * Wait for child's execvp. If the execvp succeeds (or if fork()
 442          * failed), EOF is seen immediately by the parent. Otherwise, the
 443          * child process sends a single byte.
 444          * Note that use of this infrastructure is completely advisory,
 445          * therefore, we keep error checks minimal.
 446          */
 447         close(notify_pipe[1]);
 448         if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
 449                 /*
 450                  * At this point we know that fork() succeeded, but execvp()
 451                  * failed. Errors have been reported to our stderr.
 452                  */
 453                 wait_or_whine(cmd->pid, cmd->argv[0]);
 454                 failed_errno = errno;
 455                 cmd->pid = -1;
 456         }
 457         close(notify_pipe[0]);
 458 }
 459 #else
 460 {
 461         int fhin = 0, fhout = 1, fherr = 2;
 462         const char **sargv = cmd->argv;
 463
 464         if (cmd->no_stdin)
 465                 fhin = open("/dev/null", O_RDWR);
 466         else if (need_in)
 467                 fhin = dup(fdin[0]);
 468         else if (cmd->in)
 469                 fhin = dup(cmd->in);
 470
 471         if (cmd->no_stderr)
 472                 fherr = open("/dev/null", O_RDWR);
 473         else if (need_err)
 474                 fherr = dup(fderr[1]);
 475         else if (cmd->err > 2)
 476                 fherr = dup(cmd->err);
 477
 478         if (cmd->no_stdout)
 479                 fhout = open("/dev/null", O_RDWR);
 480         else if (cmd->stdout_to_stderr)
 481                 fhout = dup(fherr);
 482         else if (need_out)
 483                 fhout = dup(fdout[1]);
 484         else if (cmd->out > 1)
 485                 fhout = dup(cmd->out);
 486
 487         if (cmd->git_cmd)
 488                 cmd->argv = prepare_git_cmd(cmd->argv);
 489         else if (cmd->use_shell)
 490                 cmd->argv = prepare_shell_cmd(cmd->argv);
 491
 492         cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
 493                         cmd->dir, fhin, fhout, fherr);
 494         failed_errno = errno;
 495         if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
 496                 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
 497         if (cmd->clean_on_exit && cmd->pid >= 0)
 498                 mark_child_for_cleanup(cmd->pid);
 499
 500         if (cmd->git_cmd)
 501                 free(cmd->argv);
 502
 503         cmd->argv = sargv;
 504         if (fhin != 0)
 505                 close(fhin);
 506         if (fhout != 1)
 507                 close(fhout);
 508         if (fherr != 2)
 509                 close(fherr);
 510 }
 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);
 524                 else if (cmd->err)
 525                         close(cmd->err);
 526                 argv_array_clear(&cmd->args);
 527                 errno = failed_errno;
 528                 return -1;
 529         }
 530
 531         if (need_in)
 532                 close(fdin[0]);
 533         else if (cmd->in)
 534                 close(cmd->in);
 535
 536         if (need_out)
 537                 close(fdout[1]);
 538         else if (cmd->out)
 539                 close(cmd->out);
 540
 541         if (need_err)
 542                 close(fderr[1]);
 543         else if (cmd->err)
 544                 close(cmd->err);
 545
 546         return 0;
 547 }
 548
 549 int finish_command(struct child_process *cmd)
 550 {
 551         int ret = wait_or_whine(cmd->pid, cmd->argv[0]);
 552         argv_array_clear(&cmd->args);
 553         return ret;
 554 }
 555
 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
 564 int run_command_v_opt(const char **argv, int opt)
 565 {
 566         return run_command_v_opt_cd_env(argv, opt, NULL, NULL);
 567 }
 568
 569 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
 570 {
 571         struct child_process cmd = CHILD_PROCESS_INIT;
 572         cmd.argv = argv;
 573         cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 574         cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 575         cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 576         cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
 577         cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0;
 578         cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
 579         cmd.dir = dir;
 580         cmd.env = env;
 581         return run_command(&cmd);
 582 }
 583
 584 #ifndef NO_PTHREADS
 585 static pthread_t main_thread;
 586 static int main_thread_set;
 587 static pthread_key_t async_key;
 588 static pthread_key_t async_die_counter;
 589
 590 static void *run_thread(void *data)
 591 {
 592         struct async *async = data;
 593         intptr_t ret;
 594
 595         pthread_setspecific(async_key, async);
 596         ret = async->proc(async->proc_in, async->proc_out, async->data);
 597         return (void *)ret;
 598 }
 599
 600 static NORETURN void die_async(const char *err, va_list params)
 601 {
 602         vreportf("fatal: ", err, params);
 603
 604         if (!pthread_equal(main_thread, pthread_self())) {
 605                 struct async *async = pthread_getspecific(async_key);
 606                 if (async->proc_in >= 0)
 607                         close(async->proc_in);
 608                 if (async->proc_out >= 0)
 609                         close(async->proc_out);
 610                 pthread_exit((void *)128);
 611         }
 612
 613         exit(128);
 614 }
 615
 616 static int async_die_is_recursing(void)
 617 {
 618         void *ret = pthread_getspecific(async_die_counter);
 619         pthread_setspecific(async_die_counter, (void *)1);
 620         return ret != NULL;
 621 }
 622
 623 #endif
 624
 625 int start_async(struct async *async)
 626 {
 627         int need_in, need_out;
 628         int fdin[2], fdout[2];
 629         int proc_in, proc_out;
 630
 631         need_in = async->in < 0;
 632         if (need_in) {
 633                 if (pipe(fdin) < 0) {
 634                         if (async->out > 0)
 635                                 close(async->out);
 636                         return error("cannot create pipe: %s", strerror(errno));
 637                 }
 638                 async->in = fdin[1];
 639         }
 640
 641         need_out = async->out < 0;
 642         if (need_out) {
 643                 if (pipe(fdout) < 0) {
 644                         if (need_in)
 645                                 close_pair(fdin);
 646                         else if (async->in)
 647                                 close(async->in);
 648                         return error("cannot create pipe: %s", strerror(errno));
 649                 }
 650                 async->out = fdout[0];
 651         }
 652
 653         if (need_in)
 654                 proc_in = fdin[0];
 655         else if (async->in)
 656                 proc_in = async->in;
 657         else
 658                 proc_in = -1;
 659
 660         if (need_out)
 661                 proc_out = fdout[1];
 662         else if (async->out)
 663                 proc_out = async->out;
 664         else
 665                 proc_out = -1;
 666
 667 #ifdef NO_PTHREADS
 668         /* Flush stdio before fork() to avoid cloning buffers */
 669         fflush(NULL);
 670
 671         async->pid = fork();
 672         if (async->pid < 0) {
 673                 error("fork (async) failed: %s", strerror(errno));
 674                 goto error;
 675         }
 676         if (!async->pid) {
 677                 if (need_in)
 678                         close(fdin[1]);
 679                 if (need_out)
 680                         close(fdout[0]);
 681                 exit(!!async->proc(proc_in, proc_out, async->data));
 682         }
 683
 684         mark_child_for_cleanup(async->pid);
 685
 686         if (need_in)
 687                 close(fdin[0]);
 688         else if (async->in)
 689                 close(async->in);
 690
 691         if (need_out)
 692                 close(fdout[1]);
 693         else if (async->out)
 694                 close(async->out);
 695 #else
 696         if (!main_thread_set) {
 697                 /*
 698                  * We assume that the first time that start_async is called
 699                  * it is from the main thread.
 700                  */
 701                 main_thread_set = 1;
 702                 main_thread = pthread_self();
 703                 pthread_key_create(&async_key, NULL);
 704                 pthread_key_create(&async_die_counter, NULL);
 705                 set_die_routine(die_async);
 706                 set_die_is_recursing_routine(async_die_is_recursing);
 707         }
 708
 709         if (proc_in >= 0)
 710                 set_cloexec(proc_in);
 711         if (proc_out >= 0)
 712                 set_cloexec(proc_out);
 713         async->proc_in = proc_in;
 714         async->proc_out = proc_out;
 715         {
 716                 int err = pthread_create(&async->tid, NULL, run_thread, async);
 717                 if (err) {
 718                         error("cannot create thread: %s", strerror(err));
 719                         goto error;
 720                 }
 721         }
 722 #endif
 723         return 0;
 724
 725 error:
 726         if (need_in)
 727                 close_pair(fdin);
 728         else if (async->in)
 729                 close(async->in);
 730
 731         if (need_out)
 732                 close_pair(fdout);
 733         else if (async->out)
 734                 close(async->out);
 735         return -1;
 736 }
 737
 738 int finish_async(struct async *async)
 739 {
 740 #ifdef NO_PTHREADS
 741         return wait_or_whine(async->pid, "child process");
 742 #else
 743         void *ret = (void *)(intptr_t)(-1);
 744
 745         if (pthread_join(async->tid, &ret))
 746                 error("pthread_join failed");
 747         return (int)(intptr_t)ret;
 748 #endif
 749 }
 750
 751 char *find_hook(const char *name)
 752 {
 753         char *path = git_path("hooks/%s", name);
 754         if (access(path, X_OK) < 0)
 755                 path = NULL;
 756
 757         return path;
 758 }
 759
 760 int run_hook_ve(const char *const *env, const char *name, va_list args)
 761 {
 762         struct child_process hook = CHILD_PROCESS_INIT;
 763         const char *p;
 764
 765         p = find_hook(name);
 766         if (!p)
 767                 return 0;
 768
 769         argv_array_push(&hook.args, p);
 770         while ((p = va_arg(args, const char *)))
 771                 argv_array_push(&hook.args, p);
 772         hook.env = env;
 773         hook.no_stdin = 1;
 774         hook.stdout_to_stderr = 1;
 775
 776         return run_command(&hook);
 777 }
 778
 779 int run_hook_le(const char *const *env, const char *name, ...)
 780 {
 781         va_list args;
 782         int ret;
 783
 784         va_start(args, name);
 785         ret = run_hook_ve(env, name, args);
 786         va_end(args);
 787
 788         return ret;
 789 }
 790
 791 int run_hook_with_custom_index(const char *index_file, const char *name, ...)
 792 {
 793         const char *hook_env[3] =  { NULL };
 794         char index[PATH_MAX];
 795         va_list args;
 796         int ret;
 797
 798         snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 799         hook_env[0] = index;
 800
 801         va_start(args, name);
 802         ret = run_hook_ve(hook_env, name, args);
 803         va_end(args);
 804
 805         return ret;
 806 }