Andrew's git / gitweb.git /
4359086fd6c47f1bfc3fc408b7bc986517eea9a0
   1#include "builtin.h"
   2#include "cache.h"
   3#include "exec_cmd.h"
   4#include "help.h"
   5#include "quote.h"
   6#include "run-command.h"
   7#include "commit.h"
   8
   9const char git_usage_string[] =
  10        "git [--version] [--help] [-c name=value]\n"
  11        "           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
  12        "           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
  13        "           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
  14        "           <command> [<args>]";
  15
  16const char git_more_info_string[] =
  17        N_("'git help -a' and 'git help -g' lists available subcommands and some\n"
  18           "concept guides. See 'git help <command>' or 'git help <concept>'\n"
  19           "to read about a specific subcommand or concept.");
  20
  21static struct startup_info git_startup_info;
  22static int use_pager = -1;
  23
  24static void commit_pager_choice(void) {
  25        switch (use_pager) {
  26        case 0:
  27                setenv("GIT_PAGER", "cat", 1);
  28                break;
  29        case 1:
  30                setup_pager();
  31                break;
  32        default:
  33                break;
  34        }
  35}
  36
  37static int handle_options(const char ***argv, int *argc, int *envchanged)
  38{
  39        const char **orig_argv = *argv;
  40
  41        while (*argc > 0) {
  42                const char *cmd = (*argv)[0];
  43                if (cmd[0] != '-')
  44                        break;
  45
  46                /*
  47                 * For legacy reasons, the "version" and "help"
  48                 * commands can be written with "--" prepended
  49                 * to make them look like flags.
  50                 */
  51                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  52                        break;
  53
  54                /*
  55                 * Check remaining flags.
  56                 */
  57                if (!prefixcmp(cmd, "--exec-path")) {
  58                        cmd += 11;
  59                        if (*cmd == '=')
  60                                git_set_argv_exec_path(cmd + 1);
  61                        else {
  62                                puts(git_exec_path());
  63                                exit(0);
  64                        }
  65                } else if (!strcmp(cmd, "--html-path")) {
  66                        puts(system_path(GIT_HTML_PATH));
  67                        exit(0);
  68                } else if (!strcmp(cmd, "--man-path")) {
  69                        puts(system_path(GIT_MAN_PATH));
  70                        exit(0);
  71                } else if (!strcmp(cmd, "--info-path")) {
  72                        puts(system_path(GIT_INFO_PATH));
  73                        exit(0);
  74                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  75                        use_pager = 1;
  76                } else if (!strcmp(cmd, "--no-pager")) {
  77                        use_pager = 0;
  78                        if (envchanged)
  79                                *envchanged = 1;
  80                } else if (!strcmp(cmd, "--no-replace-objects")) {
  81                        read_replace_refs = 0;
  82                        setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  83                        if (envchanged)
  84                                *envchanged = 1;
  85                } else if (!strcmp(cmd, "--git-dir")) {
  86                        if (*argc < 2) {
  87                                fprintf(stderr, "No directory given for --git-dir.\n" );
  88                                usage(git_usage_string);
  89                        }
  90                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  91                        if (envchanged)
  92                                *envchanged = 1;
  93                        (*argv)++;
  94                        (*argc)--;
  95                } else if (!prefixcmp(cmd, "--git-dir=")) {
  96                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  97                        if (envchanged)
  98                                *envchanged = 1;
  99                } else if (!strcmp(cmd, "--namespace")) {
 100                        if (*argc < 2) {
 101                                fprintf(stderr, "No namespace given for --namespace.\n" );
 102                                usage(git_usage_string);
 103                        }
 104                        setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 105                        if (envchanged)
 106                                *envchanged = 1;
 107                        (*argv)++;
 108                        (*argc)--;
 109                } else if (!prefixcmp(cmd, "--namespace=")) {
 110                        setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
 111                        if (envchanged)
 112                                *envchanged = 1;
 113                } else if (!strcmp(cmd, "--work-tree")) {
 114                        if (*argc < 2) {
 115                                fprintf(stderr, "No directory given for --work-tree.\n" );
 116                                usage(git_usage_string);
 117                        }
 118                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 119                        if (envchanged)
 120                                *envchanged = 1;
 121                        (*argv)++;
 122                        (*argc)--;
 123                } else if (!prefixcmp(cmd, "--work-tree=")) {
 124                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 125                        if (envchanged)
 126                                *envchanged = 1;
 127                } else if (!strcmp(cmd, "--bare")) {
 128                        static char git_dir[PATH_MAX+1];
 129                        is_bare_repository_cfg = 1;
 130                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 131                        setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
 132                        if (envchanged)
 133                                *envchanged = 1;
 134                } else if (!strcmp(cmd, "-c")) {
 135                        if (*argc < 2) {
 136                                fprintf(stderr, "-c expects a configuration string\n" );
 137                                usage(git_usage_string);
 138                        }
 139                        git_config_push_parameter((*argv)[1]);
 140                        (*argv)++;
 141                        (*argc)--;
 142                } else if (!strcmp(cmd, "--literal-pathspecs")) {
 143                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
 144                        if (envchanged)
 145                                *envchanged = 1;
 146                } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
 147                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
 148                        if (envchanged)
 149                                *envchanged = 1;
 150                } else if (!strcmp(cmd, "--shallow-file")) {
 151                        (*argv)++;
 152                        (*argc)--;
 153                        set_alternate_shallow_file((*argv)[0]);
 154                        if (envchanged)
 155                                *envchanged = 1;
 156                } else {
 157                        fprintf(stderr, "Unknown option: %s\n", cmd);
 158                        usage(git_usage_string);
 159                }
 160
 161                (*argv)++;
 162                (*argc)--;
 163        }
 164        return (*argv) - orig_argv;
 165}
 166
 167static int handle_alias(int *argcp, const char ***argv)
 168{
 169        int envchanged = 0, ret = 0, saved_errno = errno;
 170        const char *subdir;
 171        int count, option_count;
 172        const char **new_argv;
 173        const char *alias_command;
 174        char *alias_string;
 175        int unused_nongit;
 176
 177        subdir = setup_git_directory_gently(&unused_nongit);
 178
 179        alias_command = (*argv)[0];
 180        alias_string = alias_lookup(alias_command);
 181        if (alias_string) {
 182                if (alias_string[0] == '!') {
 183                        const char **alias_argv;
 184                        int argc = *argcp, i;
 185
 186                        commit_pager_choice();
 187
 188                        /* build alias_argv */
 189                        alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
 190                        alias_argv[0] = alias_string + 1;
 191                        for (i = 1; i < argc; ++i)
 192                                alias_argv[i] = (*argv)[i];
 193                        alias_argv[argc] = NULL;
 194
 195                        ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
 196                        if (ret >= 0)   /* normal exit */
 197                                exit(ret);
 198
 199                        die_errno("While expanding alias '%s': '%s'",
 200                            alias_command, alias_string + 1);
 201                }
 202                count = split_cmdline(alias_string, &new_argv);
 203                if (count < 0)
 204                        die("Bad alias.%s string: %s", alias_command,
 205                            split_cmdline_strerror(count));
 206                option_count = handle_options(&new_argv, &count, &envchanged);
 207                if (envchanged)
 208                        die("alias '%s' changes environment variables\n"
 209                                 "You can use '!git' in the alias to do this.",
 210                                 alias_command);
 211                memmove(new_argv - option_count, new_argv,
 212                                count * sizeof(char *));
 213                new_argv -= option_count;
 214
 215                if (count < 1)
 216                        die("empty alias for %s", alias_command);
 217
 218                if (!strcmp(alias_command, new_argv[0]))
 219                        die("recursive alias: %s", alias_command);
 220
 221                trace_argv_printf(new_argv,
 222                                  "trace: alias expansion: %s =>",
 223                                  alias_command);
 224
 225                new_argv = xrealloc(new_argv, sizeof(char *) *
 226                                    (count + *argcp));
 227                /* insert after command name */
 228                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 229
 230                *argv = new_argv;
 231                *argcp += count - 1;
 232
 233                ret = 1;
 234        }
 235
 236        if (subdir && chdir(subdir))
 237                die_errno("Cannot change to '%s'", subdir);
 238
 239        errno = saved_errno;
 240
 241        return ret;
 242}
 243
 244#define RUN_SETUP               (1<<0)
 245#define RUN_SETUP_GENTLY        (1<<1)
 246#define USE_PAGER               (1<<2)
 247/*
 248 * require working tree to be present -- anything uses this needs
 249 * RUN_SETUP for reading from the configuration file.
 250 */
 251#define NEED_WORK_TREE          (1<<3)
 252
 253struct cmd_struct {
 254        const char *cmd;
 255        int (*fn)(int, const char **, const char *);
 256        int option;
 257};
 258
 259static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 260{
 261        int status, help;
 262        struct stat st;
 263        const char *prefix;
 264
 265        prefix = NULL;
 266        help = argc == 2 && !strcmp(argv[1], "-h");
 267        if (!help) {
 268                if (p->option & RUN_SETUP)
 269                        prefix = setup_git_directory();
 270                if (p->option & RUN_SETUP_GENTLY) {
 271                        int nongit_ok;
 272                        prefix = setup_git_directory_gently(&nongit_ok);
 273                }
 274
 275                if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 276                        use_pager = check_pager_config(p->cmd);
 277                if (use_pager == -1 && p->option & USE_PAGER)
 278                        use_pager = 1;
 279
 280                if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
 281                    startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
 282                        trace_repo_setup(prefix);
 283        }
 284        commit_pager_choice();
 285
 286        if (!help && p->option & NEED_WORK_TREE)
 287                setup_work_tree();
 288
 289        trace_argv_printf(argv, "trace: built-in: git");
 290
 291        status = p->fn(argc, argv, prefix);
 292        if (status)
 293                return status;
 294
 295        /* Somebody closed stdout? */
 296        if (fstat(fileno(stdout), &st))
 297                return 0;
 298        /* Ignore write errors for pipes and sockets.. */
 299        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 300                return 0;
 301
 302        /* Check for ENOSPC and EIO errors.. */
 303        if (fflush(stdout))
 304                die_errno("write failure on standard output");
 305        if (ferror(stdout))
 306                die("unknown write failure on standard output");
 307        if (fclose(stdout))
 308                die_errno("close failed on standard output");
 309        return 0;
 310}
 311
 312static void handle_internal_command(int argc, const char **argv)
 313{
 314        const char *cmd = argv[0];
 315        static struct cmd_struct commands[] = {
 316                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 317                { "annotate", cmd_annotate, RUN_SETUP },
 318                { "apply", cmd_apply, RUN_SETUP_GENTLY },
 319                { "archive", cmd_archive },
 320                { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 321                { "blame", cmd_blame, RUN_SETUP },
 322                { "branch", cmd_branch, RUN_SETUP },
 323                { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 324                { "cat-file", cmd_cat_file, RUN_SETUP },
 325                { "check-attr", cmd_check_attr, RUN_SETUP },
 326                { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
 327                { "check-ref-format", cmd_check_ref_format },
 328                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 329                { "checkout-index", cmd_checkout_index,
 330                        RUN_SETUP | NEED_WORK_TREE},
 331                { "cherry", cmd_cherry, RUN_SETUP },
 332                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 333                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 334                { "clone", cmd_clone },
 335                { "column", cmd_column, RUN_SETUP_GENTLY },
 336                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 337                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 338                { "config", cmd_config, RUN_SETUP_GENTLY },
 339                { "count-objects", cmd_count_objects, RUN_SETUP },
 340                { "credential", cmd_credential, RUN_SETUP_GENTLY },
 341                { "describe", cmd_describe, RUN_SETUP },
 342                { "diff", cmd_diff },
 343                { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 344                { "diff-index", cmd_diff_index, RUN_SETUP },
 345                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 346                { "fast-export", cmd_fast_export, RUN_SETUP },
 347                { "fetch", cmd_fetch, RUN_SETUP },
 348                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 349                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 350                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 351                { "format-patch", cmd_format_patch, RUN_SETUP },
 352                { "fsck", cmd_fsck, RUN_SETUP },
 353                { "fsck-objects", cmd_fsck, RUN_SETUP },
 354                { "gc", cmd_gc, RUN_SETUP },
 355                { "get-tar-commit-id", cmd_get_tar_commit_id },
 356                { "grep", cmd_grep, RUN_SETUP_GENTLY },
 357                { "hash-object", cmd_hash_object },
 358                { "help", cmd_help },
 359                { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
 360                { "init", cmd_init_db },
 361                { "init-db", cmd_init_db },
 362                { "log", cmd_log, RUN_SETUP },
 363                { "ls-files", cmd_ls_files, RUN_SETUP },
 364                { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 365                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 366                { "mailinfo", cmd_mailinfo },
 367                { "mailsplit", cmd_mailsplit },
 368                { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 369                { "merge-base", cmd_merge_base, RUN_SETUP },
 370                { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 371                { "merge-index", cmd_merge_index, RUN_SETUP },
 372                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 373                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 374                { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 375                { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 376                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 377                { "merge-tree", cmd_merge_tree, RUN_SETUP },
 378                { "mktag", cmd_mktag, RUN_SETUP },
 379                { "mktree", cmd_mktree, RUN_SETUP },
 380                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 381                { "name-rev", cmd_name_rev, RUN_SETUP },
 382                { "notes", cmd_notes, RUN_SETUP },
 383                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 384                { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 385                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 386                { "patch-id", cmd_patch_id },
 387                { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 388                { "pickaxe", cmd_blame, RUN_SETUP },
 389                { "prune", cmd_prune, RUN_SETUP },
 390                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 391                { "push", cmd_push, RUN_SETUP },
 392                { "read-tree", cmd_read_tree, RUN_SETUP },
 393                { "receive-pack", cmd_receive_pack },
 394                { "reflog", cmd_reflog, RUN_SETUP },
 395                { "remote", cmd_remote, RUN_SETUP },
 396                { "remote-ext", cmd_remote_ext },
 397                { "remote-fd", cmd_remote_fd },
 398                { "replace", cmd_replace, RUN_SETUP },
 399                { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
 400                { "rerere", cmd_rerere, RUN_SETUP },
 401                { "reset", cmd_reset, RUN_SETUP },
 402                { "rev-list", cmd_rev_list, RUN_SETUP },
 403                { "rev-parse", cmd_rev_parse },
 404                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 405                { "rm", cmd_rm, RUN_SETUP },
 406                { "send-pack", cmd_send_pack, RUN_SETUP },
 407                { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 408                { "show", cmd_show, RUN_SETUP },
 409                { "show-branch", cmd_show_branch, RUN_SETUP },
 410                { "show-ref", cmd_show_ref, RUN_SETUP },
 411                { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 412                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 413                { "stripspace", cmd_stripspace },
 414                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 415                { "tag", cmd_tag, RUN_SETUP },
 416                { "tar-tree", cmd_tar_tree },
 417                { "unpack-file", cmd_unpack_file, RUN_SETUP },
 418                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 419                { "update-index", cmd_update_index, RUN_SETUP },
 420                { "update-ref", cmd_update_ref, RUN_SETUP },
 421                { "update-server-info", cmd_update_server_info, RUN_SETUP },
 422                { "upload-archive", cmd_upload_archive },
 423                { "upload-archive--writer", cmd_upload_archive_writer },
 424                { "var", cmd_var, RUN_SETUP_GENTLY },
 425                { "verify-pack", cmd_verify_pack },
 426                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 427                { "version", cmd_version },
 428                { "whatchanged", cmd_whatchanged, RUN_SETUP },
 429                { "write-tree", cmd_write_tree, RUN_SETUP },
 430        };
 431        int i;
 432        static const char ext[] = STRIP_EXTENSION;
 433
 434        if (sizeof(ext) > 1) {
 435                i = strlen(argv[0]) - strlen(ext);
 436                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 437                        char *argv0 = xstrdup(argv[0]);
 438                        argv[0] = cmd = argv0;
 439                        argv0[i] = '\0';
 440                }
 441        }
 442
 443        /* Turn "git cmd --help" into "git help cmd" */
 444        if (argc > 1 && !strcmp(argv[1], "--help")) {
 445                argv[1] = argv[0];
 446                argv[0] = cmd = "help";
 447        }
 448
 449        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 450                struct cmd_struct *p = commands+i;
 451                if (strcmp(p->cmd, cmd))
 452                        continue;
 453                exit(run_builtin(p, argc, argv));
 454        }
 455}
 456
 457static void execv_dashed_external(const char **argv)
 458{
 459        struct strbuf cmd = STRBUF_INIT;
 460        const char *tmp;
 461        int status;
 462
 463        if (use_pager == -1)
 464                use_pager = check_pager_config(argv[0]);
 465        commit_pager_choice();
 466
 467        strbuf_addf(&cmd, "git-%s", argv[0]);
 468
 469        /*
 470         * argv[0] must be the git command, but the argv array
 471         * belongs to the caller, and may be reused in
 472         * subsequent loop iterations. Save argv[0] and
 473         * restore it on error.
 474         */
 475        tmp = argv[0];
 476        argv[0] = cmd.buf;
 477
 478        trace_argv_printf(argv, "trace: exec:");
 479
 480        /*
 481         * if we fail because the command is not found, it is
 482         * OK to return. Otherwise, we just pass along the status code.
 483         */
 484        status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
 485        if (status >= 0 || errno != ENOENT)
 486                exit(status);
 487
 488        argv[0] = tmp;
 489
 490        strbuf_release(&cmd);
 491}
 492
 493static int run_argv(int *argcp, const char ***argv)
 494{
 495        int done_alias = 0;
 496
 497        while (1) {
 498                /* See if it's an internal command */
 499                handle_internal_command(*argcp, *argv);
 500
 501                /* .. then try the external ones */
 502                execv_dashed_external(*argv);
 503
 504                /* It could be an alias -- this works around the insanity
 505                 * of overriding "git log" with "git show" by having
 506                 * alias.log = show
 507                 */
 508                if (done_alias || !handle_alias(argcp, argv))
 509                        break;
 510                done_alias = 1;
 511        }
 512
 513        return done_alias;
 514}
 515
 516
 517int main(int argc, char **av)
 518{
 519        const char **argv = (const char **) av;
 520        const char *cmd;
 521
 522        startup_info = &git_startup_info;
 523
 524        cmd = git_extract_argv0_path(argv[0]);
 525        if (!cmd)
 526                cmd = "git-help";
 527
 528        git_setup_gettext();
 529
 530        /*
 531         * "git-xxxx" is the same as "git xxxx", but we obviously:
 532         *
 533         *  - cannot take flags in between the "git" and the "xxxx".
 534         *  - cannot execute it externally (since it would just do
 535         *    the same thing over again)
 536         *
 537         * So we just directly call the internal command handler, and
 538         * die if that one cannot handle it.
 539         */
 540        if (!prefixcmp(cmd, "git-")) {
 541                cmd += 4;
 542                argv[0] = cmd;
 543                handle_internal_command(argc, argv);
 544                die("cannot handle %s internally", cmd);
 545        }
 546
 547        /* Look for flags.. */
 548        argv++;
 549        argc--;
 550        handle_options(&argv, &argc, NULL);
 551        if (argc > 0) {
 552                if (!prefixcmp(argv[0], "--"))
 553                        argv[0] += 2;
 554        } else {
 555                /* The user didn't specify a command; give them help */
 556                commit_pager_choice();
 557                printf("usage: %s\n\n", git_usage_string);
 558                list_common_cmds_help();
 559                printf("\n%s\n", _(git_more_info_string));
 560                exit(1);
 561        }
 562        cmd = argv[0];
 563
 564        /*
 565         * We use PATH to find git commands, but we prepend some higher
 566         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 567         * environment, and the $(gitexecdir) from the Makefile at build
 568         * time.
 569         */
 570        setup_path();
 571
 572        while (1) {
 573                static int done_help = 0;
 574                static int was_alias = 0;
 575                was_alias = run_argv(&argc, &argv);
 576                if (errno != ENOENT)
 577                        break;
 578                if (was_alias) {
 579                        fprintf(stderr, "Expansion of alias '%s' failed; "
 580                                "'%s' is not a git command\n",
 581                                cmd, argv[0]);
 582                        exit(1);
 583                }
 584                if (!done_help) {
 585                        cmd = argv[0] = help_unknown_cmd(cmd);
 586                        done_help = 1;
 587                } else
 588                        break;
 589        }
 590
 591        fprintf(stderr, "Failed to run command '%s': %s\n",
 592                cmd, strerror(errno));
 593
 594        return 1;
 595}