Andrew's git / gitweb.git / run-command.c
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run-command.con commit Update draft release notes to 2.0 (82edd39)
   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        /*
 283         * In case of errors we must keep the promise to close FDs
 284         * that have been passed in via ->in and ->out.
 285         */
 286
 287        need_in = !cmd->no_stdin && cmd->in < 0;
 288        if (need_in) {
 289                if (pipe(fdin) < 0) {
 290                        failed_errno = errno;
 291                        if (cmd->out > 0)
 292                                close(cmd->out);
 293                        str = "standard input";
 294                        goto fail_pipe;
 295                }
 296                cmd->in = fdin[1];
 297        }
 298
 299        need_out = !cmd->no_stdout
 300                && !cmd->stdout_to_stderr
 301                && cmd->out < 0;
 302        if (need_out) {
 303                if (pipe(fdout) < 0) {
 304                        failed_errno = errno;
 305                        if (need_in)
 306                                close_pair(fdin);
 307                        else if (cmd->in)
 308                                close(cmd->in);
 309                        str = "standard output";
 310                        goto fail_pipe;
 311                }
 312                cmd->out = fdout[0];
 313        }
 314
 315        need_err = !cmd->no_stderr && cmd->err < 0;
 316        if (need_err) {
 317                if (pipe(fderr) < 0) {
 318                        failed_errno = errno;
 319                        if (need_in)
 320                                close_pair(fdin);
 321                        else if (cmd->in)
 322                                close(cmd->in);
 323                        if (need_out)
 324                                close_pair(fdout);
 325                        else if (cmd->out)
 326                                close(cmd->out);
 327                        str = "standard error";
 328fail_pipe:
 329                        error("cannot create %s pipe for %s: %s",
 330                                str, cmd->argv[0], strerror(failed_errno));
 331                        errno = failed_errno;
 332                        return -1;
 333                }
 334                cmd->err = fderr[0];
 335        }
 336
 337        trace_argv_printf(cmd->argv, "trace: run_command:");
 338        fflush(NULL);
 339
 340#ifndef GIT_WINDOWS_NATIVE
 341{
 342        int notify_pipe[2];
 343        if (pipe(notify_pipe))
 344                notify_pipe[0] = notify_pipe[1] = -1;
 345
 346        cmd->pid = fork();
 347        failed_errno = errno;
 348        if (!cmd->pid) {
 349                /*
 350                 * Redirect the channel to write syscall error messages to
 351                 * before redirecting the process's stderr so that all die()
 352                 * in subsequent call paths use the parent's stderr.
 353                 */
 354                if (cmd->no_stderr || need_err) {
 355                        child_err = dup(2);
 356                        set_cloexec(child_err);
 357                }
 358                set_die_routine(die_child);
 359                set_error_routine(error_child);
 360
 361                close(notify_pipe[0]);
 362                set_cloexec(notify_pipe[1]);
 363                child_notifier = notify_pipe[1];
 364                atexit(notify_parent);
 365
 366                if (cmd->no_stdin)
 367                        dup_devnull(0);
 368                else if (need_in) {
 369                        dup2(fdin[0], 0);
 370                        close_pair(fdin);
 371                } else if (cmd->in) {
 372                        dup2(cmd->in, 0);
 373                        close(cmd->in);
 374                }
 375
 376                if (cmd->no_stderr)
 377                        dup_devnull(2);
 378                else if (need_err) {
 379                        dup2(fderr[1], 2);
 380                        close_pair(fderr);
 381                } else if (cmd->err > 1) {
 382                        dup2(cmd->err, 2);
 383                        close(cmd->err);
 384                }
 385
 386                if (cmd->no_stdout)
 387                        dup_devnull(1);
 388                else if (cmd->stdout_to_stderr)
 389                        dup2(2, 1);
 390                else if (need_out) {
 391                        dup2(fdout[1], 1);
 392                        close_pair(fdout);
 393                } else if (cmd->out > 1) {
 394                        dup2(cmd->out, 1);
 395                        close(cmd->out);
 396                }
 397
 398                if (cmd->dir && chdir(cmd->dir))
 399                        die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
 400                            cmd->dir);
 401                if (cmd->env) {
 402                        for (; *cmd->env; cmd->env++) {
 403                                if (strchr(*cmd->env, '='))
 404                                        putenv((char *)*cmd->env);
 405                                else
 406                                        unsetenv(*cmd->env);
 407                        }
 408                }
 409                if (cmd->git_cmd)
 410                        execv_git_cmd(cmd->argv);
 411                else if (cmd->use_shell)
 412                        execv_shell_cmd(cmd->argv);
 413                else
 414                        sane_execvp(cmd->argv[0], (char *const*) cmd->argv);
 415                if (errno == ENOENT) {
 416                        if (!cmd->silent_exec_failure)
 417                                error("cannot run %s: %s", cmd->argv[0],
 418                                        strerror(ENOENT));
 419                        exit(127);
 420                } else {
 421                        die_errno("cannot exec '%s'", cmd->argv[0]);
 422                }
 423        }
 424        if (cmd->pid < 0)
 425                error("cannot fork() for %s: %s", cmd->argv[0],
 426                        strerror(errno));
 427        else if (cmd->clean_on_exit)
 428                mark_child_for_cleanup(cmd->pid);
 429
 430        /*
 431         * Wait for child's execvp. If the execvp succeeds (or if fork()
 432         * failed), EOF is seen immediately by the parent. Otherwise, the
 433         * child process sends a single byte.
 434         * Note that use of this infrastructure is completely advisory,
 435         * therefore, we keep error checks minimal.
 436         */
 437        close(notify_pipe[1]);
 438        if (read(notify_pipe[0], &notify_pipe[1], 1) == 1) {
 439                /*
 440                 * At this point we know that fork() succeeded, but execvp()
 441                 * failed. Errors have been reported to our stderr.
 442                 */
 443                wait_or_whine(cmd->pid, cmd->argv[0]);
 444                failed_errno = errno;
 445                cmd->pid = -1;
 446        }
 447        close(notify_pipe[0]);
 448}
 449#else
 450{
 451        int fhin = 0, fhout = 1, fherr = 2;
 452        const char **sargv = cmd->argv;
 453        char **env = environ;
 454
 455        if (cmd->no_stdin)
 456                fhin = open("/dev/null", O_RDWR);
 457        else if (need_in)
 458                fhin = dup(fdin[0]);
 459        else if (cmd->in)
 460                fhin = dup(cmd->in);
 461
 462        if (cmd->no_stderr)
 463                fherr = open("/dev/null", O_RDWR);
 464        else if (need_err)
 465                fherr = dup(fderr[1]);
 466        else if (cmd->err > 2)
 467                fherr = dup(cmd->err);
 468
 469        if (cmd->no_stdout)
 470                fhout = open("/dev/null", O_RDWR);
 471        else if (cmd->stdout_to_stderr)
 472                fhout = dup(fherr);
 473        else if (need_out)
 474                fhout = dup(fdout[1]);
 475        else if (cmd->out > 1)
 476                fhout = dup(cmd->out);
 477
 478        if (cmd->env)
 479                env = make_augmented_environ(cmd->env);
 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, env, cmd->dir,
 487                                  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->env)
 495                free_environ(env);
 496        if (cmd->git_cmd)
 497                free(cmd->argv);
 498
 499        cmd->argv = sargv;
 500        if (fhin != 0)
 501                close(fhin);
 502        if (fhout != 1)
 503                close(fhout);
 504        if (fherr != 2)
 505                close(fherr);
 506}
 507#endif
 508
 509        if (cmd->pid < 0) {
 510                if (need_in)
 511                        close_pair(fdin);
 512                else if (cmd->in)
 513                        close(cmd->in);
 514                if (need_out)
 515                        close_pair(fdout);
 516                else if (cmd->out)
 517                        close(cmd->out);
 518                if (need_err)
 519                        close_pair(fderr);
 520                else if (cmd->err)
 521                        close(cmd->err);
 522                errno = failed_errno;
 523                return -1;
 524        }
 525
 526        if (need_in)
 527                close(fdin[0]);
 528        else if (cmd->in)
 529                close(cmd->in);
 530
 531        if (need_out)
 532                close(fdout[1]);
 533        else if (cmd->out)
 534                close(cmd->out);
 535
 536        if (need_err)
 537                close(fderr[1]);
 538        else if (cmd->err)
 539                close(cmd->err);
 540
 541        return 0;
 542}
 543
 544int finish_command(struct child_process *cmd)
 545{
 546        return wait_or_whine(cmd->pid, cmd->argv[0]);
 547}
 548
 549int run_command(struct child_process *cmd)
 550{
 551        int code = start_command(cmd);
 552        if (code)
 553                return code;
 554        return finish_command(cmd);
 555}
 556
 557static void prepare_run_command_v_opt(struct child_process *cmd,
 558                                      const char **argv,
 559                                      int opt)
 560{
 561        memset(cmd, 0, sizeof(*cmd));
 562        cmd->argv = argv;
 563        cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 564        cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 565        cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 566        cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
 567        cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
 568        cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
 569}
 570
 571int run_command_v_opt(const char **argv, int opt)
 572{
 573        struct child_process cmd;
 574        prepare_run_command_v_opt(&cmd, argv, opt);
 575        return run_command(&cmd);
 576}
 577
 578int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
 579{
 580        struct child_process cmd;
 581        prepare_run_command_v_opt(&cmd, argv, opt);
 582        cmd.dir = dir;
 583        cmd.env = env;
 584        return run_command(&cmd);
 585}
 586
 587#ifndef NO_PTHREADS
 588static pthread_t main_thread;
 589static int main_thread_set;
 590static pthread_key_t async_key;
 591static pthread_key_t async_die_counter;
 592
 593static void *run_thread(void *data)
 594{
 595        struct async *async = data;
 596        intptr_t ret;
 597
 598        pthread_setspecific(async_key, async);
 599        ret = async->proc(async->proc_in, async->proc_out, async->data);
 600        return (void *)ret;
 601}
 602
 603static NORETURN void die_async(const char *err, va_list params)
 604{
 605        vreportf("fatal: ", err, params);
 606
 607        if (!pthread_equal(main_thread, pthread_self())) {
 608                struct async *async = pthread_getspecific(async_key);
 609                if (async->proc_in >= 0)
 610                        close(async->proc_in);
 611                if (async->proc_out >= 0)
 612                        close(async->proc_out);
 613                pthread_exit((void *)128);
 614        }
 615
 616        exit(128);
 617}
 618
 619static int async_die_is_recursing(void)
 620{
 621        void *ret = pthread_getspecific(async_die_counter);
 622        pthread_setspecific(async_die_counter, (void *)1);
 623        return ret != NULL;
 624}
 625
 626#endif
 627
 628int start_async(struct async *async)
 629{
 630        int need_in, need_out;
 631        int fdin[2], fdout[2];
 632        int proc_in, proc_out;
 633
 634        need_in = async->in < 0;
 635        if (need_in) {
 636                if (pipe(fdin) < 0) {
 637                        if (async->out > 0)
 638                                close(async->out);
 639                        return error("cannot create pipe: %s", strerror(errno));
 640                }
 641                async->in = fdin[1];
 642        }
 643
 644        need_out = async->out < 0;
 645        if (need_out) {
 646                if (pipe(fdout) < 0) {
 647                        if (need_in)
 648                                close_pair(fdin);
 649                        else if (async->in)
 650                                close(async->in);
 651                        return error("cannot create pipe: %s", strerror(errno));
 652                }
 653                async->out = fdout[0];
 654        }
 655
 656        if (need_in)
 657                proc_in = fdin[0];
 658        else if (async->in)
 659                proc_in = async->in;
 660        else
 661                proc_in = -1;
 662
 663        if (need_out)
 664                proc_out = fdout[1];
 665        else if (async->out)
 666                proc_out = async->out;
 667        else
 668                proc_out = -1;
 669
 670#ifdef NO_PTHREADS
 671        /* Flush stdio before fork() to avoid cloning buffers */
 672        fflush(NULL);
 673
 674        async->pid = fork();
 675        if (async->pid < 0) {
 676                error("fork (async) failed: %s", strerror(errno));
 677                goto error;
 678        }
 679        if (!async->pid) {
 680                if (need_in)
 681                        close(fdin[1]);
 682                if (need_out)
 683                        close(fdout[0]);
 684                exit(!!async->proc(proc_in, proc_out, async->data));
 685        }
 686
 687        mark_child_for_cleanup(async->pid);
 688
 689        if (need_in)
 690                close(fdin[0]);
 691        else if (async->in)
 692                close(async->in);
 693
 694        if (need_out)
 695                close(fdout[1]);
 696        else if (async->out)
 697                close(async->out);
 698#else
 699        if (!main_thread_set) {
 700                /*
 701                 * We assume that the first time that start_async is called
 702                 * it is from the main thread.
 703                 */
 704                main_thread_set = 1;
 705                main_thread = pthread_self();
 706                pthread_key_create(&async_key, NULL);
 707                pthread_key_create(&async_die_counter, NULL);
 708                set_die_routine(die_async);
 709                set_die_is_recursing_routine(async_die_is_recursing);
 710        }
 711
 712        if (proc_in >= 0)
 713                set_cloexec(proc_in);
 714        if (proc_out >= 0)
 715                set_cloexec(proc_out);
 716        async->proc_in = proc_in;
 717        async->proc_out = proc_out;
 718        {
 719                int err = pthread_create(&async->tid, NULL, run_thread, async);
 720                if (err) {
 721                        error("cannot create thread: %s", strerror(err));
 722                        goto error;
 723                }
 724        }
 725#endif
 726        return 0;
 727
 728error:
 729        if (need_in)
 730                close_pair(fdin);
 731        else if (async->in)
 732                close(async->in);
 733
 734        if (need_out)
 735                close_pair(fdout);
 736        else if (async->out)
 737                close(async->out);
 738        return -1;
 739}
 740
 741int finish_async(struct async *async)
 742{
 743#ifdef NO_PTHREADS
 744        return wait_or_whine(async->pid, "child process");
 745#else
 746        void *ret = (void *)(intptr_t)(-1);
 747
 748        if (pthread_join(async->tid, &ret))
 749                error("pthread_join failed");
 750        return (int)(intptr_t)ret;
 751#endif
 752}
 753
 754char *find_hook(const char *name)
 755{
 756        char *path = git_path("hooks/%s", name);
 757        if (access(path, X_OK) < 0)
 758                path = NULL;
 759
 760        return path;
 761}
 762
 763int run_hook_ve(const char *const *env, const char *name, va_list args)
 764{
 765        struct child_process hook;
 766        struct argv_array argv = ARGV_ARRAY_INIT;
 767        const char *p;
 768        int ret;
 769
 770        p = find_hook(name);
 771        if (!p)
 772                return 0;
 773
 774        argv_array_push(&argv, p);
 775
 776        while ((p = va_arg(args, const char *)))
 777                argv_array_push(&argv, p);
 778
 779        memset(&hook, 0, sizeof(hook));
 780        hook.argv = argv.argv;
 781        hook.env = env;
 782        hook.no_stdin = 1;
 783        hook.stdout_to_stderr = 1;
 784
 785        ret = run_command(&hook);
 786        argv_array_clear(&argv);
 787        return ret;
 788}
 789
 790int run_hook_le(const char *const *env, const char *name, ...)
 791{
 792        va_list args;
 793        int ret;
 794
 795        va_start(args, name);
 796        ret = run_hook_ve(env, name, args);
 797        va_end(args);
 798
 799        return ret;
 800}
 801
 802int run_hook_with_custom_index(const char *index_file, const char *name, ...)
 803{
 804        const char *hook_env[3] =  { NULL };
 805        char index[PATH_MAX];
 806        va_list args;
 807        int ret;
 808
 809        snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
 810        hook_env[0] = index;
 811
 812        va_start(args, name);
 813        ret = run_hook_ve(hook_env, name, args);
 814        va_end(args);
 815
 816        return ret;
 817}