Andrew's git / gitweb.git / git.c
?
git.con commit completion: add and use --list-cmds=alias (3301d36)
   1#include "builtin.h"
   2#include "config.h"
   3#include "exec_cmd.h"
   4#include "help.h"
   5#include "run-command.h"
   6#include "alias.h"
   7
   8#define RUN_SETUP               (1<<0)
   9#define RUN_SETUP_GENTLY        (1<<1)
  10#define USE_PAGER               (1<<2)
  11/*
  12 * require working tree to be present -- anything uses this needs
  13 * RUN_SETUP for reading from the configuration file.
  14 */
  15#define NEED_WORK_TREE          (1<<3)
  16#define SUPPORT_SUPER_PREFIX    (1<<4)
  17#define DELAY_PAGER_CONFIG      (1<<5)
  18#define NO_PARSEOPT             (1<<6) /* parse-options is not used */
  19
  20struct cmd_struct {
  21        const char *cmd;
  22        int (*fn)(int, const char **, const char *);
  23        unsigned int option;
  24};
  25
  26const char git_usage_string[] =
  27        N_("git [--version] [--help] [-C <path>] [-c <name>=<value>]\n"
  28           "           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
  29           "           [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n"
  30           "           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
  31           "           <command> [<args>]");
  32
  33const char git_more_info_string[] =
  34        N_("'git help -a' and 'git help -g' list available subcommands and some\n"
  35           "concept guides. See 'git help <command>' or 'git help <concept>'\n"
  36           "to read about a specific subcommand or concept.");
  37
  38static int use_pager = -1;
  39
  40static void list_builtins(struct string_list *list, unsigned int exclude_option);
  41
  42static void exclude_helpers_from_list(struct string_list *list)
  43{
  44        int i = 0;
  45
  46        while (i < list->nr) {
  47                if (strstr(list->items[i].string, "--"))
  48                        unsorted_string_list_delete_item(list, i, 0);
  49                else
  50                        i++;
  51        }
  52}
  53
  54static int match_token(const char *spec, int len, const char *token)
  55{
  56        int token_len = strlen(token);
  57
  58        return len == token_len && !strncmp(spec, token, token_len);
  59}
  60
  61static int list_cmds(const char *spec)
  62{
  63        struct string_list list = STRING_LIST_INIT_DUP;
  64        int i;
  65
  66        while (*spec) {
  67                const char *sep = strchrnul(spec, ',');
  68                int len = sep - spec;
  69
  70                if (match_token(spec, len, "builtins"))
  71                        list_builtins(&list, 0);
  72                else if (match_token(spec, len, "main"))
  73                        list_all_main_cmds(&list);
  74                else if (match_token(spec, len, "others"))
  75                        list_all_other_cmds(&list);
  76                else if (match_token(spec, len, "nohelpers"))
  77                        exclude_helpers_from_list(&list);
  78                else if (match_token(spec, len, "alias"))
  79                        list_aliases(&list);
  80                else if (len > 5 && !strncmp(spec, "list-", 5)) {
  81                        struct strbuf sb = STRBUF_INIT;
  82
  83                        strbuf_add(&sb, spec + 5, len - 5);
  84                        list_cmds_by_category(&list, sb.buf);
  85                        strbuf_release(&sb);
  86                }
  87                else
  88                        die(_("unsupported command listing type '%s'"), spec);
  89                spec += len;
  90                if (*spec == ',')
  91                        spec++;
  92        }
  93        for (i = 0; i < list.nr; i++)
  94                puts(list.items[i].string);
  95        string_list_clear(&list, 0);
  96        return 0;
  97}
  98
  99static void commit_pager_choice(void) {
 100        switch (use_pager) {
 101        case 0:
 102                setenv("GIT_PAGER", "cat", 1);
 103                break;
 104        case 1:
 105                setup_pager();
 106                break;
 107        default:
 108                break;
 109        }
 110}
 111
 112void setup_auto_pager(const char *cmd, int def)
 113{
 114        if (use_pager != -1 || pager_in_use())
 115                return;
 116        use_pager = check_pager_config(cmd);
 117        if (use_pager == -1)
 118                use_pager = def;
 119        commit_pager_choice();
 120}
 121
 122static int handle_options(const char ***argv, int *argc, int *envchanged)
 123{
 124        const char **orig_argv = *argv;
 125
 126        while (*argc > 0) {
 127                const char *cmd = (*argv)[0];
 128                if (cmd[0] != '-')
 129                        break;
 130
 131                /*
 132                 * For legacy reasons, the "version" and "help"
 133                 * commands can be written with "--" prepended
 134                 * to make them look like flags.
 135                 */
 136                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
 137                        break;
 138
 139                /*
 140                 * Check remaining flags.
 141                 */
 142                if (skip_prefix(cmd, "--exec-path", &cmd)) {
 143                        if (*cmd == '=')
 144                                git_set_argv_exec_path(cmd + 1);
 145                        else {
 146                                puts(git_exec_path());
 147                                exit(0);
 148                        }
 149                } else if (!strcmp(cmd, "--html-path")) {
 150                        puts(system_path(GIT_HTML_PATH));
 151                        exit(0);
 152                } else if (!strcmp(cmd, "--man-path")) {
 153                        puts(system_path(GIT_MAN_PATH));
 154                        exit(0);
 155                } else if (!strcmp(cmd, "--info-path")) {
 156                        puts(system_path(GIT_INFO_PATH));
 157                        exit(0);
 158                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 159                        use_pager = 1;
 160                } else if (!strcmp(cmd, "--no-pager")) {
 161                        use_pager = 0;
 162                        if (envchanged)
 163                                *envchanged = 1;
 164                } else if (!strcmp(cmd, "--no-replace-objects")) {
 165                        check_replace_refs = 0;
 166                        setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
 167                        if (envchanged)
 168                                *envchanged = 1;
 169                } else if (!strcmp(cmd, "--git-dir")) {
 170                        if (*argc < 2) {
 171                                fprintf(stderr, _("no directory given for --git-dir\n" ));
 172                                usage(git_usage_string);
 173                        }
 174                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 175                        if (envchanged)
 176                                *envchanged = 1;
 177                        (*argv)++;
 178                        (*argc)--;
 179                } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
 180                        setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
 181                        if (envchanged)
 182                                *envchanged = 1;
 183                } else if (!strcmp(cmd, "--namespace")) {
 184                        if (*argc < 2) {
 185                                fprintf(stderr, _("no namespace given for --namespace\n" ));
 186                                usage(git_usage_string);
 187                        }
 188                        setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 189                        if (envchanged)
 190                                *envchanged = 1;
 191                        (*argv)++;
 192                        (*argc)--;
 193                } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
 194                        setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
 195                        if (envchanged)
 196                                *envchanged = 1;
 197                } else if (!strcmp(cmd, "--work-tree")) {
 198                        if (*argc < 2) {
 199                                fprintf(stderr, _("no directory given for --work-tree\n" ));
 200                                usage(git_usage_string);
 201                        }
 202                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 203                        if (envchanged)
 204                                *envchanged = 1;
 205                        (*argv)++;
 206                        (*argc)--;
 207                } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
 208                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
 209                        if (envchanged)
 210                                *envchanged = 1;
 211                } else if (!strcmp(cmd, "--super-prefix")) {
 212                        if (*argc < 2) {
 213                                fprintf(stderr, _("no prefix given for --super-prefix\n" ));
 214                                usage(git_usage_string);
 215                        }
 216                        setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
 217                        if (envchanged)
 218                                *envchanged = 1;
 219                        (*argv)++;
 220                        (*argc)--;
 221                } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
 222                        setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
 223                        if (envchanged)
 224                                *envchanged = 1;
 225                } else if (!strcmp(cmd, "--bare")) {
 226                        char *cwd = xgetcwd();
 227                        is_bare_repository_cfg = 1;
 228                        setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
 229                        free(cwd);
 230                        setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
 231                        if (envchanged)
 232                                *envchanged = 1;
 233                } else if (!strcmp(cmd, "-c")) {
 234                        if (*argc < 2) {
 235                                fprintf(stderr, _("-c expects a configuration string\n" ));
 236                                usage(git_usage_string);
 237                        }
 238                        git_config_push_parameter((*argv)[1]);
 239                        (*argv)++;
 240                        (*argc)--;
 241                } else if (!strcmp(cmd, "--literal-pathspecs")) {
 242                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
 243                        if (envchanged)
 244                                *envchanged = 1;
 245                } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
 246                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
 247                        if (envchanged)
 248                                *envchanged = 1;
 249                } else if (!strcmp(cmd, "--glob-pathspecs")) {
 250                        setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 251                        if (envchanged)
 252                                *envchanged = 1;
 253                } else if (!strcmp(cmd, "--noglob-pathspecs")) {
 254                        setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 255                        if (envchanged)
 256                                *envchanged = 1;
 257                } else if (!strcmp(cmd, "--icase-pathspecs")) {
 258                        setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
 259                        if (envchanged)
 260                                *envchanged = 1;
 261                } else if (!strcmp(cmd, "--no-optional-locks")) {
 262                        setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
 263                        if (envchanged)
 264                                *envchanged = 1;
 265                } else if (!strcmp(cmd, "--shallow-file")) {
 266                        (*argv)++;
 267                        (*argc)--;
 268                        set_alternate_shallow_file((*argv)[0], 1);
 269                        if (envchanged)
 270                                *envchanged = 1;
 271                } else if (!strcmp(cmd, "-C")) {
 272                        if (*argc < 2) {
 273                                fprintf(stderr, _("no directory given for -C\n" ));
 274                                usage(git_usage_string);
 275                        }
 276                        if ((*argv)[1][0]) {
 277                                if (chdir((*argv)[1]))
 278                                        die_errno("cannot change to '%s'", (*argv)[1]);
 279                                if (envchanged)
 280                                        *envchanged = 1;
 281                        }
 282                        (*argv)++;
 283                        (*argc)--;
 284                } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
 285                        if (!strcmp(cmd, "parseopt")) {
 286                                struct string_list list = STRING_LIST_INIT_DUP;
 287                                int i;
 288
 289                                list_builtins(&list, NO_PARSEOPT);
 290                                for (i = 0; i < list.nr; i++)
 291                                        printf("%s ", list.items[i].string);
 292                                string_list_clear(&list, 0);
 293                                exit(0);
 294                        } else {
 295                                exit(list_cmds(cmd));
 296                        }
 297                } else {
 298                        fprintf(stderr, _("unknown option: %s\n"), cmd);
 299                        usage(git_usage_string);
 300                }
 301
 302                (*argv)++;
 303                (*argc)--;
 304        }
 305        return (*argv) - orig_argv;
 306}
 307
 308static int handle_alias(int *argcp, const char ***argv)
 309{
 310        int envchanged = 0, ret = 0, saved_errno = errno;
 311        int count, option_count;
 312        const char **new_argv;
 313        const char *alias_command;
 314        char *alias_string;
 315
 316        alias_command = (*argv)[0];
 317        alias_string = alias_lookup(alias_command);
 318        if (alias_string) {
 319                if (alias_string[0] == '!') {
 320                        struct child_process child = CHILD_PROCESS_INIT;
 321                        int nongit_ok;
 322
 323                        /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
 324                        setup_git_directory_gently(&nongit_ok);
 325
 326                        commit_pager_choice();
 327
 328                        child.use_shell = 1;
 329                        argv_array_push(&child.args, alias_string + 1);
 330                        argv_array_pushv(&child.args, (*argv) + 1);
 331
 332                        ret = run_command(&child);
 333                        if (ret >= 0)   /* normal exit */
 334                                exit(ret);
 335
 336                        die_errno("while expanding alias '%s': '%s'",
 337                            alias_command, alias_string + 1);
 338                }
 339                count = split_cmdline(alias_string, &new_argv);
 340                if (count < 0)
 341                        die("Bad alias.%s string: %s", alias_command,
 342                            split_cmdline_strerror(count));
 343                option_count = handle_options(&new_argv, &count, &envchanged);
 344                if (envchanged)
 345                        die("alias '%s' changes environment variables.\n"
 346                                 "You can use '!git' in the alias to do this",
 347                                 alias_command);
 348                memmove(new_argv - option_count, new_argv,
 349                                count * sizeof(char *));
 350                new_argv -= option_count;
 351
 352                if (count < 1)
 353                        die("empty alias for %s", alias_command);
 354
 355                if (!strcmp(alias_command, new_argv[0]))
 356                        die("recursive alias: %s", alias_command);
 357
 358                trace_argv_printf(new_argv,
 359                                  "trace: alias expansion: %s =>",
 360                                  alias_command);
 361
 362                REALLOC_ARRAY(new_argv, count + *argcp);
 363                /* insert after command name */
 364                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 365
 366                *argv = new_argv;
 367                *argcp += count - 1;
 368
 369                ret = 1;
 370        }
 371
 372        errno = saved_errno;
 373
 374        return ret;
 375}
 376
 377static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 378{
 379        int status, help;
 380        struct stat st;
 381        const char *prefix;
 382
 383        prefix = NULL;
 384        help = argc == 2 && !strcmp(argv[1], "-h");
 385        if (!help) {
 386                if (p->option & RUN_SETUP)
 387                        prefix = setup_git_directory();
 388                else if (p->option & RUN_SETUP_GENTLY) {
 389                        int nongit_ok;
 390                        prefix = setup_git_directory_gently(&nongit_ok);
 391                }
 392
 393                if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
 394                    !(p->option & DELAY_PAGER_CONFIG))
 395                        use_pager = check_pager_config(p->cmd);
 396                if (use_pager == -1 && p->option & USE_PAGER)
 397                        use_pager = 1;
 398
 399                if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
 400                    startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
 401                        trace_repo_setup(prefix);
 402        }
 403        commit_pager_choice();
 404
 405        if (!help && get_super_prefix()) {
 406                if (!(p->option & SUPPORT_SUPER_PREFIX))
 407                        die("%s doesn't support --super-prefix", p->cmd);
 408        }
 409
 410        if (!help && p->option & NEED_WORK_TREE)
 411                setup_work_tree();
 412
 413        trace_argv_printf(argv, "trace: built-in: git");
 414
 415        status = p->fn(argc, argv, prefix);
 416        if (status)
 417                return status;
 418
 419        /* Somebody closed stdout? */
 420        if (fstat(fileno(stdout), &st))
 421                return 0;
 422        /* Ignore write errors for pipes and sockets.. */
 423        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 424                return 0;
 425
 426        /* Check for ENOSPC and EIO errors.. */
 427        if (fflush(stdout))
 428                die_errno("write failure on standard output");
 429        if (ferror(stdout))
 430                die("unknown write failure on standard output");
 431        if (fclose(stdout))
 432                die_errno("close failed on standard output");
 433        return 0;
 434}
 435
 436static struct cmd_struct commands[] = {
 437        { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 438        { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 439        { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 440        { "apply", cmd_apply, RUN_SETUP_GENTLY },
 441        { "archive", cmd_archive, RUN_SETUP_GENTLY },
 442        { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 443        { "blame", cmd_blame, RUN_SETUP },
 444        { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
 445        { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT },
 446        { "cat-file", cmd_cat_file, RUN_SETUP },
 447        { "check-attr", cmd_check_attr, RUN_SETUP },
 448        { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
 449        { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
 450        { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT  },
 451        { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 452        { "checkout-index", cmd_checkout_index,
 453                RUN_SETUP | NEED_WORK_TREE},
 454        { "cherry", cmd_cherry, RUN_SETUP },
 455        { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 456        { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 457        { "clone", cmd_clone },
 458        { "column", cmd_column, RUN_SETUP_GENTLY },
 459        { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 460        { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT },
 461        { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
 462        { "count-objects", cmd_count_objects, RUN_SETUP },
 463        { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
 464        { "describe", cmd_describe, RUN_SETUP },
 465        { "diff", cmd_diff, NO_PARSEOPT },
 466        { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 467        { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
 468        { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
 469        { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
 470        { "fast-export", cmd_fast_export, RUN_SETUP },
 471        { "fetch", cmd_fetch, RUN_SETUP },
 472        { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
 473        { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 474        { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 475        { "format-patch", cmd_format_patch, RUN_SETUP },
 476        { "fsck", cmd_fsck, RUN_SETUP },
 477        { "fsck-objects", cmd_fsck, RUN_SETUP },
 478        { "gc", cmd_gc, RUN_SETUP },
 479        { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
 480        { "grep", cmd_grep, RUN_SETUP_GENTLY },
 481        { "hash-object", cmd_hash_object },
 482        { "help", cmd_help },
 483        { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
 484        { "init", cmd_init_db },
 485        { "init-db", cmd_init_db },
 486        { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
 487        { "log", cmd_log, RUN_SETUP },
 488        { "ls-files", cmd_ls_files, RUN_SETUP },
 489        { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 490        { "ls-tree", cmd_ls_tree, RUN_SETUP },
 491        { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
 492        { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
 493        { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 494        { "merge-base", cmd_merge_base, RUN_SETUP },
 495        { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 496        { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
 497        { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
 498        { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 499        { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 500        { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 501        { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 502        { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
 503        { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
 504        { "mktree", cmd_mktree, RUN_SETUP },
 505        { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 506        { "name-rev", cmd_name_rev, RUN_SETUP },
 507        { "notes", cmd_notes, RUN_SETUP },
 508        { "pack-objects", cmd_pack_objects, RUN_SETUP },
 509        { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
 510        { "pack-refs", cmd_pack_refs, RUN_SETUP },
 511        { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
 512        { "pickaxe", cmd_blame, RUN_SETUP },
 513        { "prune", cmd_prune, RUN_SETUP },
 514        { "prune-packed", cmd_prune_packed, RUN_SETUP },
 515        { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
 516        { "push", cmd_push, RUN_SETUP },
 517        { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
 518        { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
 519        { "receive-pack", cmd_receive_pack },
 520        { "reflog", cmd_reflog, RUN_SETUP },
 521        { "remote", cmd_remote, RUN_SETUP },
 522        { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
 523        { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
 524        { "repack", cmd_repack, RUN_SETUP },
 525        { "replace", cmd_replace, RUN_SETUP },
 526        { "rerere", cmd_rerere, RUN_SETUP },
 527        { "reset", cmd_reset, RUN_SETUP },
 528        { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
 529        { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
 530        { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 531        { "rm", cmd_rm, RUN_SETUP },
 532        { "send-pack", cmd_send_pack, RUN_SETUP },
 533        { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 534        { "show", cmd_show, RUN_SETUP },
 535        { "show-branch", cmd_show_branch, RUN_SETUP },
 536        { "show-ref", cmd_show_ref, RUN_SETUP },
 537        { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 538        { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 539        { "stripspace", cmd_stripspace },
 540        { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
 541        { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 542        { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
 543        { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
 544        { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
 545        { "update-index", cmd_update_index, RUN_SETUP },
 546        { "update-ref", cmd_update_ref, RUN_SETUP },
 547        { "update-server-info", cmd_update_server_info, RUN_SETUP },
 548        { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
 549        { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
 550        { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
 551        { "verify-commit", cmd_verify_commit, RUN_SETUP },
 552        { "verify-pack", cmd_verify_pack },
 553        { "verify-tag", cmd_verify_tag, RUN_SETUP },
 554        { "version", cmd_version },
 555        { "whatchanged", cmd_whatchanged, RUN_SETUP },
 556        { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT },
 557        { "write-tree", cmd_write_tree, RUN_SETUP },
 558};
 559
 560static struct cmd_struct *get_builtin(const char *s)
 561{
 562        int i;
 563        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 564                struct cmd_struct *p = commands + i;
 565                if (!strcmp(s, p->cmd))
 566                        return p;
 567        }
 568        return NULL;
 569}
 570
 571int is_builtin(const char *s)
 572{
 573        return !!get_builtin(s);
 574}
 575
 576static void list_builtins(struct string_list *out, unsigned int exclude_option)
 577{
 578        int i;
 579        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 580                if (exclude_option &&
 581                    (commands[i].option & exclude_option))
 582                        continue;
 583                string_list_append(out, commands[i].cmd);
 584        }
 585}
 586
 587#ifdef STRIP_EXTENSION
 588static void strip_extension(const char **argv)
 589{
 590        size_t len;
 591
 592        if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
 593                argv[0] = xmemdupz(argv[0], len);
 594}
 595#else
 596#define strip_extension(cmd)
 597#endif
 598
 599static void handle_builtin(int argc, const char **argv)
 600{
 601        struct argv_array args = ARGV_ARRAY_INIT;
 602        const char *cmd;
 603        struct cmd_struct *builtin;
 604
 605        strip_extension(argv);
 606        cmd = argv[0];
 607
 608        /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
 609        if (argc > 1 && !strcmp(argv[1], "--help")) {
 610                int i;
 611
 612                argv[1] = argv[0];
 613                argv[0] = cmd = "help";
 614
 615                for (i = 0; i < argc; i++) {
 616                        argv_array_push(&args, argv[i]);
 617                        if (!i)
 618                                argv_array_push(&args, "--exclude-guides");
 619                }
 620
 621                argc++;
 622                argv = args.argv;
 623        }
 624
 625        builtin = get_builtin(cmd);
 626        if (builtin)
 627                exit(run_builtin(builtin, argc, argv));
 628        argv_array_clear(&args);
 629}
 630
 631static void execv_dashed_external(const char **argv)
 632{
 633        struct child_process cmd = CHILD_PROCESS_INIT;
 634        int status;
 635
 636        if (get_super_prefix())
 637                die("%s doesn't support --super-prefix", argv[0]);
 638
 639        if (use_pager == -1 && !is_builtin(argv[0]))
 640                use_pager = check_pager_config(argv[0]);
 641        commit_pager_choice();
 642
 643        argv_array_pushf(&cmd.args, "git-%s", argv[0]);
 644        argv_array_pushv(&cmd.args, argv + 1);
 645        cmd.clean_on_exit = 1;
 646        cmd.wait_after_clean = 1;
 647        cmd.silent_exec_failure = 1;
 648
 649        trace_argv_printf(cmd.args.argv, "trace: exec:");
 650
 651        /*
 652         * If we fail because the command is not found, it is
 653         * OK to return. Otherwise, we just pass along the status code,
 654         * or our usual generic code if we were not even able to exec
 655         * the program.
 656         */
 657        status = run_command(&cmd);
 658        if (status >= 0)
 659                exit(status);
 660        else if (errno != ENOENT)
 661                exit(128);
 662}
 663
 664static int run_argv(int *argcp, const char ***argv)
 665{
 666        int done_alias = 0;
 667
 668        while (1) {
 669                /*
 670                 * If we tried alias and futzed with our environment,
 671                 * it no longer is safe to invoke builtins directly in
 672                 * general.  We have to spawn them as dashed externals.
 673                 *
 674                 * NEEDSWORK: if we can figure out cases
 675                 * where it is safe to do, we can avoid spawning a new
 676                 * process.
 677                 */
 678                if (!done_alias)
 679                        handle_builtin(*argcp, *argv);
 680
 681                /* .. then try the external ones */
 682                execv_dashed_external(*argv);
 683
 684                /* It could be an alias -- this works around the insanity
 685                 * of overriding "git log" with "git show" by having
 686                 * alias.log = show
 687                 */
 688                if (done_alias)
 689                        break;
 690                if (!handle_alias(argcp, argv))
 691                        break;
 692                done_alias = 1;
 693        }
 694
 695        return done_alias;
 696}
 697
 698int cmd_main(int argc, const char **argv)
 699{
 700        const char *cmd;
 701        int done_help = 0;
 702
 703        cmd = argv[0];
 704        if (!cmd)
 705                cmd = "git-help";
 706        else {
 707                const char *slash = find_last_dir_sep(cmd);
 708                if (slash)
 709                        cmd = slash + 1;
 710        }
 711
 712        trace_command_performance(argv);
 713
 714        /*
 715         * "git-xxxx" is the same as "git xxxx", but we obviously:
 716         *
 717         *  - cannot take flags in between the "git" and the "xxxx".
 718         *  - cannot execute it externally (since it would just do
 719         *    the same thing over again)
 720         *
 721         * So we just directly call the builtin handler, and die if
 722         * that one cannot handle it.
 723         */
 724        if (skip_prefix(cmd, "git-", &cmd)) {
 725                argv[0] = cmd;
 726                handle_builtin(argc, argv);
 727                die("cannot handle %s as a builtin", cmd);
 728        }
 729
 730        /* Look for flags.. */
 731        argv++;
 732        argc--;
 733        handle_options(&argv, &argc, NULL);
 734        if (argc > 0) {
 735                /* translate --help and --version into commands */
 736                skip_prefix(argv[0], "--", &argv[0]);
 737        } else {
 738                /* The user didn't specify a command; give them help */
 739                commit_pager_choice();
 740                printf("usage: %s\n\n", git_usage_string);
 741                list_common_cmds_help();
 742                printf("\n%s\n", _(git_more_info_string));
 743                exit(1);
 744        }
 745        cmd = argv[0];
 746
 747        /*
 748         * We use PATH to find git commands, but we prepend some higher
 749         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 750         * environment, and the $(gitexecdir) from the Makefile at build
 751         * time.
 752         */
 753        setup_path();
 754
 755        while (1) {
 756                int was_alias = run_argv(&argc, &argv);
 757                if (errno != ENOENT)
 758                        break;
 759                if (was_alias) {
 760                        fprintf(stderr, _("expansion of alias '%s' failed; "
 761                                          "'%s' is not a git command\n"),
 762                                cmd, argv[0]);
 763                        exit(1);
 764                }
 765                if (!done_help) {
 766                        cmd = argv[0] = help_unknown_cmd(cmd);
 767                        done_help = 1;
 768                } else
 769                        break;
 770        }
 771
 772        fprintf(stderr, _("failed to run command '%s': %s\n"),
 773                cmd, strerror(errno));
 774
 775        return 1;
 776}