Andrew's git / gitweb.git / run-command.c
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run-command.con commit fetch: convert argv_gc_auto to struct argv_array (1991006)
   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
  11struct 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{
  56        struct child_to_clean **pp;
  57
  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);
  64                        return;
  65                }
  66        }
  67}
  68
  69static inline void close_pair(int fd[2])
  70{
  71        close(fd[0]);
  72        close(fd[1]);
  73}
  74
  75#ifndef GIT_WINDOWS_NATIVE
  76static inline void dup_devnull(int to)
  77{
  78        int fd = open("/dev/null", O_RDWR);
  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);
  83        close(fd);
  84}
  85#endif
  86
  87static 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
 119static int exists_in_PATH(const char *file)
 120{
 121        char *r = locate_in_PATH(file);
 122        free(r);
 123        return r != NULL;
 124}
 125
 126int 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;
 146        else if (errno == ENOTDIR && !strchr(file, '/'))
 147                errno = ENOENT;
 148        return -1;
 149}
 150
 151static 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 $0 */
 159        nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
 160
 161        if (argc < 1)
 162                die("BUG: shell command is empty");
 163
 164        if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
 165#ifndef GIT_WINDOWS_NATIVE
 166                nargv[nargc++] = SHELL_PATH;
 167#else
 168                nargv[nargc++] = "sh";
 169#endif
 170                nargv[nargc++] = "-c";
 171
 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                }
 179        }
 180
 181        for (argc = 0; argv[argc]; argc++)
 182                nargv[nargc++] = argv[argc];
 183        nargv[nargc] = NULL;
 184
 185        return nargv;
 186}
 187
 188#ifndef GIT_WINDOWS_NATIVE
 189static int execv_shell_cmd(const char **argv)
 190{
 191        const char **nargv = prepare_shell_cmd(argv);
 192        trace_argv_printf(nargv, "trace: exec:");
 193        sane_execvp(nargv[0], (char **)nargv);
 194        free(nargv);
 195        return -1;
 196}
 197#endif
 198
 199#ifndef GIT_WINDOWS_NATIVE
 200static int child_err = 2;
 201static int child_notifier = -1;
 202
 203static void notify_parent(void)
 204{
 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);
 211}
 212
 213static NORETURN void die_child(const char *err, va_list params)
 214{
 215        vwritef(child_err, "fatal: ", err, params);
 216        exit(128);
 217}
 218
 219static void error_child(const char *err, va_list params)
 220{
 221        vwritef(child_err, "error: ", err, params);
 222}
 223#endif
 224
 225static 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}
 231
 232static int wait_or_whine(pid_t pid, const char *argv0)
 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);
 248                if (code != SIGINT && code != SIGQUIT)
 249                        error("%s died of signal %d", argv0, code);
 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                 */
 255                code += 128;
 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;
 264                }
 265        } else {
 266                error("waitpid is confused (%s)", argv0);
 267        }
 268
 269        clear_child_for_cleanup(pid);
 270
 271        errno = failed_errno;
 272        return code;
 273}
 274
 275int start_command(struct child_process *cmd)
 276{
 277        int need_in, need_out, need_err;
 278        int fdin[2], fdout[2], fderr[2];
 279        int failed_errno;
 280        char *str;
 281
 282        if (!cmd->argv)
 283                cmd->argv = cmd->args.argv;
 284
 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
 290        need_in = !cmd->no_stdin && cmd->in < 0;
 291        if (need_in) {
 292                if (pipe(fdin) < 0) {
 293                        failed_errno = errno;
 294                        if (cmd->out > 0)
 295                                close(cmd->out);
 296                        str = "standard input";
 297                        goto fail_pipe;
 298                }
 299                cmd->in = fdin[1];
 300        }
 301
 302        need_out = !cmd->no_stdout
 303                && !cmd->stdout_to_stderr
 304                && cmd->out < 0;
 305        if (need_out) {
 306                if (pipe(fdout) < 0) {
 307                        failed_errno = errno;
 308                        if (need_in)
 309                                close_pair(fdin);
 310                        else if (cmd->in)
 311                                close(cmd->in);
 312                        str = "standard output";
 313                        goto fail_pipe;
 314                }
 315                cmd->out = fdout[0];
 316        }
 317
 318        need_err = !cmd->no_stderr && cmd->err < 0;
 319        if (need_err) {
 320                if (pipe(fderr) < 0) {
 321                        failed_errno = errno;
 322                        if (need_in)
 323                                close_pair(fdin);
 324                        else if (cmd->in)
 325                                close(cmd->in);
 326                        if (need_out)
 327                                close_pair(fdout);
 328                        else if (cmd->out)
 329                                close(cmd->out);
 330                        str = "standard error";
 331fail_pipe:
 332                        error("cannot create %s pipe for %s: %s",
 333                                str, cmd->argv[0], strerror(failed_errno));
 334                        argv_array_clear(&cmd->args);
 335                        errno = failed_errno;
 336                        return -1;
 337                }
 338                cmd->err = fderr[0];
 339        }
 340
 341        trace_argv_printf(cmd->argv, "trace: run_command:");
 342        fflush(NULL);
 343
 344#ifndef GIT_WINDOWS_NATIVE
 345{
 346        int notify_pipe[2];
 347        if (pipe(notify_pipe))
 348                notify_pipe[0] = notify_pipe[1] = -1;
 349
 350        cmd->pid = fork();
 351        failed_errno = errno;
 352        if (!cmd->pid) {
 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);
 363                set_error_routine(error_child);
 364
 365                close(notify_pipe[0]);
 366                set_cloexec(notify_pipe[1]);
 367                child_notifier = notify_pipe[1];
 368                atexit(notify_parent);
 369
 370                if (cmd->no_stdin)
 371                        dup_devnull(0);
 372                else if (need_in) {
 373                        dup2(fdin[0], 0);
 374                        close_pair(fdin);
 375                } else if (cmd->in) {
 376                        dup2(cmd->in, 0);
 377                        close(cmd->in);
 378                }
 379
 380                if (cmd->no_stderr)
 381                        dup_devnull(2);
 382                else if (need_err) {
 383                        dup2(fderr[1], 2);
 384                        close_pair(fderr);
 385                } else if (cmd->err > 1) {
 386                        dup2(cmd->err, 2);
 387                        close(cmd->err);
 388                }
 389
 390                if (cmd->no_stdout)
 391                        dup_devnull(1);
 392                else if (cmd->stdout_to_stderr)
 393                        dup2(2, 1);
 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
 402                if (cmd->dir && chdir(cmd->dir))
 403                        die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
 404                            cmd->dir);
 405                if (cmd->env) {
 406                        for (; *cmd->env; cmd->env++) {
 407                                if (strchr(*cmd->env, '='))
 408                                        putenv((char *)*cmd->env);
 409                                else
 410                                        unsetenv(*cmd->env);
 411                        }
 412                }
 413                if (cmd->git_cmd)
 414                        execv_git_cmd(cmd->argv);
 415                else if (cmd->use_shell)
 416                        execv_shell_cmd(cmd->argv);
 417                else
 418                        sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
 419                if (errno == ENOENT) {
 420                        if (!cmd->silent_exec_failure)
 421                                error("cannot run %s: %s", cmd->argv[0],
 422                                        strerror(ENOENT));
 423                        exit(127);
 424                } else {
 425                        die_errno("cannot exec '%s'", cmd->argv[0]);
 426                }
 427        }
 428        if (cmd->pid < 0)
 429                error("cannot fork() for %s: %s", cmd->argv[0],
 430                        strerror(errno));
 431        else if (cmd->clean_on_exit)
 432                mark_child_for_cleanup(cmd->pid);
 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], &notify_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                 */
 447                wait_or_whine(cmd->pid, cmd->argv[0]);
 448                failed_errno = errno;
 449                cmd->pid = -1;
 450        }
 451        close(notify_pipe[0]);
 452}
 453#else
 454{
 455        int fhin = 0, fhout = 1, fherr = 2;
 456        const char **sargv = cmd->argv;
 457
 458        if (cmd->no_stdin)
 459                fhin = open("/dev/null", O_RDWR);
 460        else if (need_in)
 461                fhin = dup(fdin[0]);
 462        else if (cmd->in)
 463                fhin = dup(cmd->in);
 464
 465        if (cmd->no_stderr)
 466                fherr = open("/dev/null", O_RDWR);
 467        else if (need_err)
 468                fherr = dup(fderr[1]);
 469        else if (cmd->err > 2)
 470                fherr = dup(cmd->err);
 471
 472        if (cmd->no_stdout)
 473                fhout = open("/dev/null", O_RDWR);
 474        else if (cmd->stdout_to_stderr)
 475                fhout = dup(fherr);
 476        else if (need_out)
 477                fhout = dup(fdout[1]);
 478        else if (cmd->out > 1)
 479                fhout = dup(cmd->out);
 480
 481        if (cmd->git_cmd)
 482                cmd->argv = prepare_git_cmd(cmd->argv);
 483        else if (cmd->use_shell)
 484                cmd->argv = prepare_shell_cmd(cmd->argv);
 485
 486        cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
 487                        cmd->dir, fhin, fhout, fherr);
 488        failed_errno = errno;
 489        if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
 490                error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
 491        if (cmd->clean_on_exit && cmd->pid >= 0)
 492                mark_child_for_cleanup(cmd->pid);
 493
 494        if (cmd->git_cmd)
 495                free(cmd->argv);
 496
 497        cmd->argv = sargv;
 498        if (fhin != 0)
 499                close(fhin);
 500        if (fhout != 1)
 501                close(fhout);
 502        if (fherr != 2)
 503                close(fherr);
 504}
 505#endif
 506
 507        if (cmd->pid < 0) {
 508                if (need_in)
 509                        close_pair(fdin);
 510                else if (cmd->in)
 511                        close(cmd->in);
 512                if (need_out)
 513                        close_pair(fdout);
 514                else if (cmd->out)
 515                        close(cmd->out);
 516                if (need_err)
 517                        close_pair(fderr);
 518                else if (cmd->err)
 519                        close(cmd->err);
 520                argv_array_clear(&cmd->args);
 521                errno = failed_errno;
 522                return -1;
 523        }
 524
 525        if (need_in)
 526                close(fdin[0]);
 527        else if (cmd->in)
 528                close(cmd->in);
 529
 530        if (need_out)
 531                close(fdout[1]);
 532        else if (cmd->out)
 533                close(cmd->out);
 534
 535        if (need_err)
 536                close(fderr[1]);
 537        else if (cmd->err)
 538                close(cmd->err);
 539
 540        return 0;
 541}
 542
 543int finish_command(struct child_process *cmd)
 544{
 545        int ret = wait_or_whine(cmd->pid, cmd->argv[0]);
 546        argv_array_clear(&cmd->args);
 547        return ret;
 548}
 549
 550int run_command(struct child_process *cmd)
 551{
 552        int code = start_command(cmd);
 553        if (code)
 554                return code;
 555        return finish_command(cmd);
 556}
 557
 558static void prepare_run_command_v_opt(struct child_process *cmd,
 559                                      const char **argv,
 560                                      int opt)
 561{
 562        memset(cmd, 0, sizeof(*cmd));
 563        cmd->argv = argv;
 564        cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 565        cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 566        cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 567        cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
 568        cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
 569        cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
 570}
 571
 572int run_command_v_opt(const char **argv, int opt)
 573{
 574        struct child_process cmd;
 575        prepare_run_command_v_opt(&cmd, argv, opt);
 576        return run_command(&cmd);
 577}
 578
 579int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
 580{
 581        struct child_process cmd;
 582        prepare_run_command_v_opt(&cmd, argv, opt);
 583        cmd.dir = dir;
 584        cmd.env = env;
 585        return run_command(&cmd);
 586}
 587
 588#ifndef NO_PTHREADS
 589static pthread_t main_thread;
 590static int main_thread_set;
 591static pthread_key_t async_key;
 592static pthread_key_t async_die_counter;
 593
 594static void *run_thread(void *data)
 595{
 596        struct async *async = data;
 597        intptr_t ret;
 598
 599        pthread_setspecific(async_key, async);
 600        ret = async->proc(async->proc_in, async->proc_out, async->data);
 601        return (void *)ret;
 602}
 603
 604static NORETURN void die_async(const char *err, va_list params)
 605{
 606        vreportf("fatal: ", err, params);
 607
 608        if (!pthread_equal(main_thread, pthread_self())) {
 609                struct async *async = pthread_getspecific(async_key);
 610                if (async->proc_in >= 0)
 611                        close(async->proc_in);
 612                if (async->proc_out >= 0)
 613                        close(async->proc_out);
 614                pthread_exit((void *)128);
 615        }
 616
 617        exit(128);
 618}
 619
 620static int async_die_is_recursing(void)
 621{
 622        void *ret = pthread_getspecific(async_die_counter);
 623        pthread_setspecific(async_die_counter, (void *)1);
 624        return ret != NULL;
 625}
 626
 627#endif
 628
 629int start_async(struct async *async)
 630{
 631        int need_in, need_out;
 632        int fdin[2], fdout[2];
 633        int proc_in, proc_out;
 634
 635        need_in = async->in < 0;
 636        if (need_in) {
 637                if (pipe(fdin) < 0) {
 638                        if (async->out > 0)
 639                                close(async->out);
 640                        return error("cannot create pipe: %s", strerror(errno));
 641                }
 642                async->in = fdin[1];
 643        }
 644
 645        need_out = async->out < 0;
 646        if (need_out) {
 647                if (pipe(fdout) < 0) {
 648                        if (need_in)
 649                                close_pair(fdin);
 650                        else if (async->in)
 651                                close(async->in);
 652                        return error("cannot create pipe: %s", strerror(errno));
 653                }
 654                async->out = fdout[0];
 655        }
 656
 657        if (need_in)
 658                proc_in = fdin[0];
 659        else if (async->in)
 660                proc_in = async->in;
 661        else
 662                proc_in = -1;
 663
 664        if (need_out)
 665                proc_out = fdout[1];
 666        else if (async->out)
 667                proc_out = async->out;
 668        else
 669                proc_out = -1;
 670
 671#ifdef NO_PTHREADS
 672        /* Flush stdio before fork() to avoid cloning buffers */
 673        fflush(NULL);
 674
 675        async->pid = fork();
 676        if (async->pid < 0) {
 677                error("fork (async) failed: %s", strerror(errno));
 678                goto error;
 679        }
 680        if (!async->pid) {
 681                if (need_in)
 682                        close(fdin[1]);
 683                if (need_out)
 684                        close(fdout[0]);
 685                exit(!!async->proc(proc_in, proc_out, async->data));
 686        }
 687
 688        mark_child_for_cleanup(async->pid);
 689
 690        if (need_in)
 691                close(fdin[0]);
 692        else if (async->in)
 693                close(async->in);
 694
 695        if (need_out)
 696                close(fdout[1]);
 697        else if (async->out)
 698                close(async->out);
 699#else
 700        if (!main_thread_set) {
 701                /*
 702                 * We assume that the first time that start_async is called
 703                 * it is from the main thread.
 704                 */
 705                main_thread_set = 1;
 706                main_thread = pthread_self();
 707                pthread_key_create(&async_key, NULL);
 708                pthread_key_create(&async_die_counter, NULL);
 709                set_die_routine(die_async);
 710                set_die_is_recursing_routine(async_die_is_recursing);
 711        }
 712
 713        if (proc_in >= 0)
 714                set_cloexec(proc_in);
 715        if (proc_out >= 0)
 716                set_cloexec(proc_out);
 717        async->proc_in = proc_in;
 718        async->proc_out = proc_out;
 719        {
 720                int err = pthread_create(&async->tid, NULL, run_thread, async);
 721                if (err) {
 722                        error("cannot create thread: %s", strerror(err));
 723                        goto error;
 724                }
 725        }
 726#endif
 727        return 0;
 728
 729error:
 730        if (need_in)
 731                close_pair(fdin);
 732        else if (async->in)
 733                close(async->in);
 734
 735        if (need_out)
 736                close_pair(fdout);
 737        else if (async->out)
 738                close(async->out);
 739        return -1;
 740}
 741
 742int finish_async(struct async *async)
 743{
 744#ifdef NO_PTHREADS
 745        return wait_or_whine(async->pid, "child process");
 746#else
 747        void *ret = (void *)(intptr_t)(-1);
 748
 749        if (pthread_join(async->tid, &ret))
 750                error("pthread_join failed");
 751        return (int)(intptr_t)ret;
 752#endif
 753}
 754
 755char *find_hook(const char *name)
 756{
 757        char *path = git_path("hooks/%s", name);
 758        if (access(path, X_OK) < 0)
 759                path = NULL;
 760
 761        return path;
 762}
 763
 764int run_hook_ve(const char *const *env, const char *name, va_list args)
 765{
 766        struct child_process hook;
 767        const char *p;
 768
 769        p = find_hook(name);
 770        if (!p)
 771                return 0;
 772
 773        memset(&hook, 0, sizeof(hook));
 774        argv_array_push(&hook.args, p);
 775        while ((p = va_arg(args, const char *)))
 776                argv_array_push(&hook.args, p);
 777        hook.env = env;
 778        hook.no_stdin = 1;
 779        hook.stdout_to_stderr = 1;
 780
 781        return run_command(&hook);
 782}
 783
 784int run_hook_le(const char *const *env, const char *name, ...)
 785{
 786        va_list args;
 787        int ret;
 788
 789        va_start(args, name);
 790        ret = run_hook_ve(env, name, args);
 791        va_end(args);
 792
 793        return ret;
 794}
 795
 796int run_hook_with_custom_index(const char *index_file, const char *name, ...)
 797{
 798        const char *hook_env[3] =  { NULL };
 799        char index[PATH_MAX];
 800        va_list args;
 801        int ret;
 802
 803        snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 804        hook_env[0] = index;
 805
 806        va_start(args, name);
 807        ret = run_hook_ve(hook_env, name, args);
 808        va_end(args);
 809
 810        return ret;
 811}