Andrew's git / gitweb.git / git.c
?
git.con commit Merge branch 'dl/rebase-i-keep-base' (640f9cd)
   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 | -P | --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.\n"
  37           "See 'git help git' for an overview of the system.");
  38
  39static int use_pager = -1;
  40
  41static void list_builtins(struct string_list *list, unsigned int exclude_option);
  42
  43static void exclude_helpers_from_list(struct string_list *list)
  44{
  45        int i = 0;
  46
  47        while (i < list->nr) {
  48                if (strstr(list->items[i].string, "--"))
  49                        unsorted_string_list_delete_item(list, i, 0);
  50                else
  51                        i++;
  52        }
  53}
  54
  55static int match_token(const char *spec, int len, const char *token)
  56{
  57        int token_len = strlen(token);
  58
  59        return len == token_len && !strncmp(spec, token, token_len);
  60}
  61
  62static int list_cmds(const char *spec)
  63{
  64        struct string_list list = STRING_LIST_INIT_DUP;
  65        int i;
  66        int nongit;
  67
  68        /*
  69        * Set up the repository so we can pick up any repo-level config (like
  70        * completion.commands).
  71        */
  72        setup_git_directory_gently(&nongit);
  73
  74        while (*spec) {
  75                const char *sep = strchrnul(spec, ',');
  76                int len = sep - spec;
  77
  78                if (match_token(spec, len, "builtins"))
  79                        list_builtins(&list, 0);
  80                else if (match_token(spec, len, "main"))
  81                        list_all_main_cmds(&list);
  82                else if (match_token(spec, len, "others"))
  83                        list_all_other_cmds(&list);
  84                else if (match_token(spec, len, "nohelpers"))
  85                        exclude_helpers_from_list(&list);
  86                else if (match_token(spec, len, "alias"))
  87                        list_aliases(&list);
  88                else if (match_token(spec, len, "config"))
  89                        list_cmds_by_config(&list);
  90                else if (len > 5 && !strncmp(spec, "list-", 5)) {
  91                        struct strbuf sb = STRBUF_INIT;
  92
  93                        strbuf_add(&sb, spec + 5, len - 5);
  94                        list_cmds_by_category(&list, sb.buf);
  95                        strbuf_release(&sb);
  96                }
  97                else
  98                        die(_("unsupported command listing type '%s'"), spec);
  99                spec += len;
 100                if (*spec == ',')
 101                        spec++;
 102        }
 103        for (i = 0; i < list.nr; i++)
 104                puts(list.items[i].string);
 105        string_list_clear(&list, 0);
 106        return 0;
 107}
 108
 109static void commit_pager_choice(void)
 110{
 111        switch (use_pager) {
 112        case 0:
 113                setenv("GIT_PAGER", "cat", 1);
 114                break;
 115        case 1:
 116                setup_pager();
 117                break;
 118        default:
 119                break;
 120        }
 121}
 122
 123void setup_auto_pager(const char *cmd, int def)
 124{
 125        if (use_pager != -1 || pager_in_use())
 126                return;
 127        use_pager = check_pager_config(cmd);
 128        if (use_pager == -1)
 129                use_pager = def;
 130        commit_pager_choice();
 131}
 132
 133static int handle_options(const char ***argv, int *argc, int *envchanged)
 134{
 135        const char **orig_argv = *argv;
 136
 137        while (*argc > 0) {
 138                const char *cmd = (*argv)[0];
 139                if (cmd[0] != '-')
 140                        break;
 141
 142                /*
 143                 * For legacy reasons, the "version" and "help"
 144                 * commands can be written with "--" prepended
 145                 * to make them look like flags.
 146                 */
 147                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
 148                        break;
 149
 150                /*
 151                 * Check remaining flags.
 152                 */
 153                if (skip_prefix(cmd, "--exec-path", &cmd)) {
 154                        if (*cmd == '=')
 155                                git_set_exec_path(cmd + 1);
 156                        else {
 157                                puts(git_exec_path());
 158                                trace2_cmd_name("_query_");
 159                                exit(0);
 160                        }
 161                } else if (!strcmp(cmd, "--html-path")) {
 162                        puts(system_path(GIT_HTML_PATH));
 163                        trace2_cmd_name("_query_");
 164                        exit(0);
 165                } else if (!strcmp(cmd, "--man-path")) {
 166                        puts(system_path(GIT_MAN_PATH));
 167                        trace2_cmd_name("_query_");
 168                        exit(0);
 169                } else if (!strcmp(cmd, "--info-path")) {
 170                        puts(system_path(GIT_INFO_PATH));
 171                        trace2_cmd_name("_query_");
 172                        exit(0);
 173                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 174                        use_pager = 1;
 175                } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) {
 176                        use_pager = 0;
 177                        if (envchanged)
 178                                *envchanged = 1;
 179                } else if (!strcmp(cmd, "--no-replace-objects")) {
 180                        read_replace_refs = 0;
 181                        setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
 182                        if (envchanged)
 183                                *envchanged = 1;
 184                } else if (!strcmp(cmd, "--git-dir")) {
 185                        if (*argc < 2) {
 186                                fprintf(stderr, _("no directory given for --git-dir\n" ));
 187                                usage(git_usage_string);
 188                        }
 189                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 190                        if (envchanged)
 191                                *envchanged = 1;
 192                        (*argv)++;
 193                        (*argc)--;
 194                } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
 195                        setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
 196                        if (envchanged)
 197                                *envchanged = 1;
 198                } else if (!strcmp(cmd, "--namespace")) {
 199                        if (*argc < 2) {
 200                                fprintf(stderr, _("no namespace given for --namespace\n" ));
 201                                usage(git_usage_string);
 202                        }
 203                        setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 204                        if (envchanged)
 205                                *envchanged = 1;
 206                        (*argv)++;
 207                        (*argc)--;
 208                } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
 209                        setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
 210                        if (envchanged)
 211                                *envchanged = 1;
 212                } else if (!strcmp(cmd, "--work-tree")) {
 213                        if (*argc < 2) {
 214                                fprintf(stderr, _("no directory given for --work-tree\n" ));
 215                                usage(git_usage_string);
 216                        }
 217                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 218                        if (envchanged)
 219                                *envchanged = 1;
 220                        (*argv)++;
 221                        (*argc)--;
 222                } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
 223                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
 224                        if (envchanged)
 225                                *envchanged = 1;
 226                } else if (!strcmp(cmd, "--super-prefix")) {
 227                        if (*argc < 2) {
 228                                fprintf(stderr, _("no prefix given for --super-prefix\n" ));
 229                                usage(git_usage_string);
 230                        }
 231                        setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
 232                        if (envchanged)
 233                                *envchanged = 1;
 234                        (*argv)++;
 235                        (*argc)--;
 236                } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
 237                        setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
 238                        if (envchanged)
 239                                *envchanged = 1;
 240                } else if (!strcmp(cmd, "--bare")) {
 241                        char *cwd = xgetcwd();
 242                        is_bare_repository_cfg = 1;
 243                        setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
 244                        free(cwd);
 245                        setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
 246                        if (envchanged)
 247                                *envchanged = 1;
 248                } else if (!strcmp(cmd, "-c")) {
 249                        if (*argc < 2) {
 250                                fprintf(stderr, _("-c expects a configuration string\n" ));
 251                                usage(git_usage_string);
 252                        }
 253                        git_config_push_parameter((*argv)[1]);
 254                        (*argv)++;
 255                        (*argc)--;
 256                } else if (!strcmp(cmd, "--literal-pathspecs")) {
 257                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
 258                        if (envchanged)
 259                                *envchanged = 1;
 260                } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
 261                        setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
 262                        if (envchanged)
 263                                *envchanged = 1;
 264                } else if (!strcmp(cmd, "--glob-pathspecs")) {
 265                        setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 266                        if (envchanged)
 267                                *envchanged = 1;
 268                } else if (!strcmp(cmd, "--noglob-pathspecs")) {
 269                        setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 270                        if (envchanged)
 271                                *envchanged = 1;
 272                } else if (!strcmp(cmd, "--icase-pathspecs")) {
 273                        setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
 274                        if (envchanged)
 275                                *envchanged = 1;
 276                } else if (!strcmp(cmd, "--no-optional-locks")) {
 277                        setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
 278                        if (envchanged)
 279                                *envchanged = 1;
 280                } else if (!strcmp(cmd, "--shallow-file")) {
 281                        (*argv)++;
 282                        (*argc)--;
 283                        set_alternate_shallow_file(the_repository, (*argv)[0], 1);
 284                        if (envchanged)
 285                                *envchanged = 1;
 286                } else if (!strcmp(cmd, "-C")) {
 287                        if (*argc < 2) {
 288                                fprintf(stderr, _("no directory given for -C\n" ));
 289                                usage(git_usage_string);
 290                        }
 291                        if ((*argv)[1][0]) {
 292                                if (chdir((*argv)[1]))
 293                                        die_errno("cannot change to '%s'", (*argv)[1]);
 294                                if (envchanged)
 295                                        *envchanged = 1;
 296                        }
 297                        (*argv)++;
 298                        (*argc)--;
 299                } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
 300                        trace2_cmd_name("_query_");
 301                        if (!strcmp(cmd, "parseopt")) {
 302                                struct string_list list = STRING_LIST_INIT_DUP;
 303                                int i;
 304
 305                                list_builtins(&list, NO_PARSEOPT);
 306                                for (i = 0; i < list.nr; i++)
 307                                        printf("%s ", list.items[i].string);
 308                                string_list_clear(&list, 0);
 309                                exit(0);
 310                        } else {
 311                                exit(list_cmds(cmd));
 312                        }
 313                } else {
 314                        fprintf(stderr, _("unknown option: %s\n"), cmd);
 315                        usage(git_usage_string);
 316                }
 317
 318                (*argv)++;
 319                (*argc)--;
 320        }
 321        return (*argv) - orig_argv;
 322}
 323
 324static int handle_alias(int *argcp, const char ***argv)
 325{
 326        int envchanged = 0, ret = 0, saved_errno = errno;
 327        int count, option_count;
 328        const char **new_argv;
 329        const char *alias_command;
 330        char *alias_string;
 331
 332        alias_command = (*argv)[0];
 333        alias_string = alias_lookup(alias_command);
 334        if (alias_string) {
 335                if (*argcp > 1 && !strcmp((*argv)[1], "-h"))
 336                        fprintf_ln(stderr, _("'%s' is aliased to '%s'"),
 337                                   alias_command, alias_string);
 338                if (alias_string[0] == '!') {
 339                        struct child_process child = CHILD_PROCESS_INIT;
 340                        int nongit_ok;
 341
 342                        /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
 343                        setup_git_directory_gently(&nongit_ok);
 344
 345                        commit_pager_choice();
 346
 347                        child.use_shell = 1;
 348                        child.trace2_child_class = "shell_alias";
 349                        argv_array_push(&child.args, alias_string + 1);
 350                        argv_array_pushv(&child.args, (*argv) + 1);
 351
 352                        trace2_cmd_alias(alias_command, child.args.argv);
 353                        trace2_cmd_list_config();
 354                        trace2_cmd_name("_run_shell_alias_");
 355
 356                        ret = run_command(&child);
 357                        if (ret >= 0)   /* normal exit */
 358                                exit(ret);
 359
 360                        die_errno(_("while expanding alias '%s': '%s'"),
 361                                  alias_command, alias_string + 1);
 362                }
 363                count = split_cmdline(alias_string, &new_argv);
 364                if (count < 0)
 365                        die(_("bad alias.%s string: %s"), alias_command,
 366                            _(split_cmdline_strerror(count)));
 367                option_count = handle_options(&new_argv, &count, &envchanged);
 368                if (envchanged)
 369                        die(_("alias '%s' changes environment variables.\n"
 370                              "You can use '!git' in the alias to do this"),
 371                            alias_command);
 372                memmove(new_argv - option_count, new_argv,
 373                                count * sizeof(char *));
 374                new_argv -= option_count;
 375
 376                if (count < 1)
 377                        die(_("empty alias for %s"), alias_command);
 378
 379                if (!strcmp(alias_command, new_argv[0]))
 380                        die(_("recursive alias: %s"), alias_command);
 381
 382                trace_argv_printf(new_argv,
 383                                  "trace: alias expansion: %s =>",
 384                                  alias_command);
 385
 386                REALLOC_ARRAY(new_argv, count + *argcp);
 387                /* insert after command name */
 388                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 389
 390                trace2_cmd_alias(alias_command, new_argv);
 391                trace2_cmd_list_config();
 392
 393                *argv = new_argv;
 394                *argcp += count - 1;
 395
 396                ret = 1;
 397        }
 398
 399        errno = saved_errno;
 400
 401        return ret;
 402}
 403
 404static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 405{
 406        int status, help;
 407        struct stat st;
 408        const char *prefix;
 409
 410        prefix = NULL;
 411        help = argc == 2 && !strcmp(argv[1], "-h");
 412        if (!help) {
 413                if (p->option & RUN_SETUP)
 414                        prefix = setup_git_directory();
 415                else if (p->option & RUN_SETUP_GENTLY) {
 416                        int nongit_ok;
 417                        prefix = setup_git_directory_gently(&nongit_ok);
 418                }
 419
 420                if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
 421                    !(p->option & DELAY_PAGER_CONFIG))
 422                        use_pager = check_pager_config(p->cmd);
 423                if (use_pager == -1 && p->option & USE_PAGER)
 424                        use_pager = 1;
 425
 426                if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
 427                    startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
 428                        trace_repo_setup(prefix);
 429        }
 430        commit_pager_choice();
 431
 432        if (!help && get_super_prefix()) {
 433                if (!(p->option & SUPPORT_SUPER_PREFIX))
 434                        die(_("%s doesn't support --super-prefix"), p->cmd);
 435        }
 436
 437        if (!help && p->option & NEED_WORK_TREE)
 438                setup_work_tree();
 439
 440        trace_argv_printf(argv, "trace: built-in: git");
 441        trace2_cmd_name(p->cmd);
 442        trace2_cmd_list_config();
 443
 444        validate_cache_entries(the_repository->index);
 445        status = p->fn(argc, argv, prefix);
 446        validate_cache_entries(the_repository->index);
 447
 448        if (status)
 449                return status;
 450
 451        /* Somebody closed stdout? */
 452        if (fstat(fileno(stdout), &st))
 453                return 0;
 454        /* Ignore write errors for pipes and sockets.. */
 455        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 456                return 0;
 457
 458        /* Check for ENOSPC and EIO errors.. */
 459        if (fflush(stdout))
 460                die_errno(_("write failure on standard output"));
 461        if (ferror(stdout))
 462                die(_("unknown write failure on standard output"));
 463        if (fclose(stdout))
 464                die_errno(_("close failed on standard output"));
 465        return 0;
 466}
 467
 468static struct cmd_struct commands[] = {
 469        { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 470        { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 471        { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 472        { "apply", cmd_apply, RUN_SETUP_GENTLY },
 473        { "archive", cmd_archive, RUN_SETUP_GENTLY },
 474        { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 475        { "blame", cmd_blame, RUN_SETUP },
 476        { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
 477        { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT },
 478        { "cat-file", cmd_cat_file, RUN_SETUP },
 479        { "check-attr", cmd_check_attr, RUN_SETUP },
 480        { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
 481        { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
 482        { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT  },
 483        { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 484        { "checkout-index", cmd_checkout_index,
 485                RUN_SETUP | NEED_WORK_TREE},
 486        { "cherry", cmd_cherry, RUN_SETUP },
 487        { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 488        { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 489        { "clone", cmd_clone },
 490        { "column", cmd_column, RUN_SETUP_GENTLY },
 491        { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 492        { "commit-graph", cmd_commit_graph, RUN_SETUP },
 493        { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT },
 494        { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
 495        { "count-objects", cmd_count_objects, RUN_SETUP },
 496        { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
 497        { "describe", cmd_describe, RUN_SETUP },
 498        { "diff", cmd_diff, NO_PARSEOPT },
 499        { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 500        { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
 501        { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
 502        { "difftool", cmd_difftool, RUN_SETUP_GENTLY },
 503        { "env--helper", cmd_env__helper },
 504        { "fast-export", cmd_fast_export, RUN_SETUP },
 505        { "fetch", cmd_fetch, RUN_SETUP },
 506        { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
 507        { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 508        { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 509        { "format-patch", cmd_format_patch, RUN_SETUP },
 510        { "fsck", cmd_fsck, RUN_SETUP },
 511        { "fsck-objects", cmd_fsck, RUN_SETUP },
 512        { "gc", cmd_gc, RUN_SETUP },
 513        { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
 514        { "grep", cmd_grep, RUN_SETUP_GENTLY },
 515        { "hash-object", cmd_hash_object },
 516        { "help", cmd_help },
 517        { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
 518        { "init", cmd_init_db },
 519        { "init-db", cmd_init_db },
 520        { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
 521        { "log", cmd_log, RUN_SETUP },
 522        { "ls-files", cmd_ls_files, RUN_SETUP },
 523        { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 524        { "ls-tree", cmd_ls_tree, RUN_SETUP },
 525        { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
 526        { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
 527        { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 528        { "merge-base", cmd_merge_base, RUN_SETUP },
 529        { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 530        { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
 531        { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
 532        { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 533        { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 534        { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 535        { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 536        { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
 537        { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
 538        { "mktree", cmd_mktree, RUN_SETUP },
 539        { "multi-pack-index", cmd_multi_pack_index, RUN_SETUP_GENTLY },
 540        { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 541        { "name-rev", cmd_name_rev, RUN_SETUP },
 542        { "notes", cmd_notes, RUN_SETUP },
 543        { "pack-objects", cmd_pack_objects, RUN_SETUP },
 544        { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
 545        { "pack-refs", cmd_pack_refs, RUN_SETUP },
 546        { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
 547        { "pickaxe", cmd_blame, RUN_SETUP },
 548        { "prune", cmd_prune, RUN_SETUP },
 549        { "prune-packed", cmd_prune_packed, RUN_SETUP },
 550        { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
 551        { "push", cmd_push, RUN_SETUP },
 552        { "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER },
 553        { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
 554        { "rebase", cmd_rebase, RUN_SETUP | NEED_WORK_TREE },
 555        { "rebase--interactive", cmd_rebase__interactive, RUN_SETUP | NEED_WORK_TREE },
 556        { "receive-pack", cmd_receive_pack },
 557        { "reflog", cmd_reflog, RUN_SETUP },
 558        { "remote", cmd_remote, RUN_SETUP },
 559        { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
 560        { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
 561        { "repack", cmd_repack, RUN_SETUP },
 562        { "replace", cmd_replace, RUN_SETUP },
 563        { "rerere", cmd_rerere, RUN_SETUP },
 564        { "reset", cmd_reset, RUN_SETUP },
 565        { "restore", cmd_restore, RUN_SETUP | NEED_WORK_TREE },
 566        { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
 567        { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
 568        { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 569        { "rm", cmd_rm, RUN_SETUP },
 570        { "send-pack", cmd_send_pack, RUN_SETUP },
 571        { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 572        { "show", cmd_show, RUN_SETUP },
 573        { "show-branch", cmd_show_branch, RUN_SETUP },
 574        { "show-index", cmd_show_index },
 575        { "show-ref", cmd_show_ref, RUN_SETUP },
 576        { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 577        /*
 578         * NEEDSWORK: Until the builtin stash is thoroughly robust and no
 579         * longer needs redirection to the stash shell script this is kept as
 580         * is, then should be changed to RUN_SETUP | NEED_WORK_TREE
 581         */
 582        { "stash", cmd_stash },
 583        { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 584        { "stripspace", cmd_stripspace },
 585        { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
 586        { "switch", cmd_switch, RUN_SETUP | NEED_WORK_TREE },
 587        { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 588        { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
 589        { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
 590        { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
 591        { "update-index", cmd_update_index, RUN_SETUP },
 592        { "update-ref", cmd_update_ref, RUN_SETUP },
 593        { "update-server-info", cmd_update_server_info, RUN_SETUP },
 594        { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
 595        { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
 596        { "upload-pack", cmd_upload_pack },
 597        { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
 598        { "verify-commit", cmd_verify_commit, RUN_SETUP },
 599        { "verify-pack", cmd_verify_pack },
 600        { "verify-tag", cmd_verify_tag, RUN_SETUP },
 601        { "version", cmd_version },
 602        { "whatchanged", cmd_whatchanged, RUN_SETUP },
 603        { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT },
 604        { "write-tree", cmd_write_tree, RUN_SETUP },
 605};
 606
 607static struct cmd_struct *get_builtin(const char *s)
 608{
 609        int i;
 610        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 611                struct cmd_struct *p = commands + i;
 612                if (!strcmp(s, p->cmd))
 613                        return p;
 614        }
 615        return NULL;
 616}
 617
 618int is_builtin(const char *s)
 619{
 620        return !!get_builtin(s);
 621}
 622
 623static void list_builtins(struct string_list *out, unsigned int exclude_option)
 624{
 625        int i;
 626        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 627                if (exclude_option &&
 628                    (commands[i].option & exclude_option))
 629                        continue;
 630                string_list_append(out, commands[i].cmd);
 631        }
 632}
 633
 634#ifdef STRIP_EXTENSION
 635static void strip_extension(const char **argv)
 636{
 637        size_t len;
 638
 639        if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
 640                argv[0] = xmemdupz(argv[0], len);
 641}
 642#else
 643#define strip_extension(cmd)
 644#endif
 645
 646static void handle_builtin(int argc, const char **argv)
 647{
 648        struct argv_array args = ARGV_ARRAY_INIT;
 649        const char *cmd;
 650        struct cmd_struct *builtin;
 651
 652        strip_extension(argv);
 653        cmd = argv[0];
 654
 655        /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
 656        if (argc > 1 && !strcmp(argv[1], "--help")) {
 657                int i;
 658
 659                argv[1] = argv[0];
 660                argv[0] = cmd = "help";
 661
 662                for (i = 0; i < argc; i++) {
 663                        argv_array_push(&args, argv[i]);
 664                        if (!i)
 665                                argv_array_push(&args, "--exclude-guides");
 666                }
 667
 668                argc++;
 669                argv = args.argv;
 670        }
 671
 672        builtin = get_builtin(cmd);
 673        if (builtin)
 674                exit(run_builtin(builtin, argc, argv));
 675        argv_array_clear(&args);
 676}
 677
 678static void execv_dashed_external(const char **argv)
 679{
 680        struct child_process cmd = CHILD_PROCESS_INIT;
 681        int status;
 682
 683        if (get_super_prefix())
 684                die(_("%s doesn't support --super-prefix"), argv[0]);
 685
 686        if (use_pager == -1 && !is_builtin(argv[0]))
 687                use_pager = check_pager_config(argv[0]);
 688        commit_pager_choice();
 689
 690        argv_array_pushf(&cmd.args, "git-%s", argv[0]);
 691        argv_array_pushv(&cmd.args, argv + 1);
 692        cmd.clean_on_exit = 1;
 693        cmd.wait_after_clean = 1;
 694        cmd.silent_exec_failure = 1;
 695        cmd.trace2_child_class = "dashed";
 696
 697        trace2_cmd_name("_run_dashed_");
 698
 699        /*
 700         * The code in run_command() logs trace2 child_start/child_exit
 701         * events, so we do not need to report exec/exec_result events here.
 702         */
 703        trace_argv_printf(cmd.args.argv, "trace: exec:");
 704
 705        /*
 706         * If we fail because the command is not found, it is
 707         * OK to return. Otherwise, we just pass along the status code,
 708         * or our usual generic code if we were not even able to exec
 709         * the program.
 710         */
 711        status = run_command(&cmd);
 712
 713        /*
 714         * If the child process ran and we are now going to exit, emit a
 715         * generic string as our trace2 command verb to indicate that we
 716         * launched a dashed command.
 717         */
 718        if (status >= 0)
 719                exit(status);
 720        else if (errno != ENOENT)
 721                exit(128);
 722}
 723
 724static int run_argv(int *argcp, const char ***argv)
 725{
 726        int done_alias = 0;
 727        struct string_list cmd_list = STRING_LIST_INIT_NODUP;
 728        struct string_list_item *seen;
 729
 730        while (1) {
 731                /*
 732                 * If we tried alias and futzed with our environment,
 733                 * it no longer is safe to invoke builtins directly in
 734                 * general.  We have to spawn them as dashed externals.
 735                 *
 736                 * NEEDSWORK: if we can figure out cases
 737                 * where it is safe to do, we can avoid spawning a new
 738                 * process.
 739                 */
 740                if (!done_alias)
 741                        handle_builtin(*argcp, *argv);
 742                else if (get_builtin(**argv)) {
 743                        struct argv_array args = ARGV_ARRAY_INIT;
 744                        int i;
 745
 746                        /*
 747                         * The current process is committed to launching a
 748                         * child process to run the command named in (**argv)
 749                         * and exiting.  Log a generic string as the trace2
 750                         * command verb to indicate this.  Note that the child
 751                         * process will log the actual verb when it runs.
 752                         */
 753                        trace2_cmd_name("_run_git_alias_");
 754
 755                        if (get_super_prefix())
 756                                die("%s doesn't support --super-prefix", **argv);
 757
 758                        commit_pager_choice();
 759
 760                        argv_array_push(&args, "git");
 761                        for (i = 0; i < *argcp; i++)
 762                                argv_array_push(&args, (*argv)[i]);
 763
 764                        trace_argv_printf(args.argv, "trace: exec:");
 765
 766                        /*
 767                         * if we fail because the command is not found, it is
 768                         * OK to return. Otherwise, we just pass along the status code.
 769                         */
 770                        i = run_command_v_opt_tr2(args.argv, RUN_SILENT_EXEC_FAILURE |
 771                                                  RUN_CLEAN_ON_EXIT, "git_alias");
 772                        if (i >= 0 || errno != ENOENT)
 773                                exit(i);
 774                        die("could not execute builtin %s", **argv);
 775                }
 776
 777                /* .. then try the external ones */
 778                execv_dashed_external(*argv);
 779
 780                seen = unsorted_string_list_lookup(&cmd_list, *argv[0]);
 781                if (seen) {
 782                        int i;
 783                        struct strbuf sb = STRBUF_INIT;
 784                        for (i = 0; i < cmd_list.nr; i++) {
 785                                struct string_list_item *item = &cmd_list.items[i];
 786
 787                                strbuf_addf(&sb, "\n  %s", item->string);
 788                                if (item == seen)
 789                                        strbuf_addstr(&sb, " <==");
 790                                else if (i == cmd_list.nr - 1)
 791                                        strbuf_addstr(&sb, " ==>");
 792                        }
 793                        die(_("alias loop detected: expansion of '%s' does"
 794                              " not terminate:%s"), cmd_list.items[0].string, sb.buf);
 795                }
 796
 797                string_list_append(&cmd_list, *argv[0]);
 798
 799                /*
 800                 * It could be an alias -- this works around the insanity
 801                 * of overriding "git log" with "git show" by having
 802                 * alias.log = show
 803                 */
 804                if (!handle_alias(argcp, argv))
 805                        break;
 806                done_alias = 1;
 807        }
 808
 809        string_list_clear(&cmd_list, 0);
 810
 811        return done_alias;
 812}
 813
 814int cmd_main(int argc, const char **argv)
 815{
 816        const char *cmd;
 817        int done_help = 0;
 818
 819        cmd = argv[0];
 820        if (!cmd)
 821                cmd = "git-help";
 822        else {
 823                const char *slash = find_last_dir_sep(cmd);
 824                if (slash)
 825                        cmd = slash + 1;
 826        }
 827
 828        trace_command_performance(argv);
 829
 830        /*
 831         * "git-xxxx" is the same as "git xxxx", but we obviously:
 832         *
 833         *  - cannot take flags in between the "git" and the "xxxx".
 834         *  - cannot execute it externally (since it would just do
 835         *    the same thing over again)
 836         *
 837         * So we just directly call the builtin handler, and die if
 838         * that one cannot handle it.
 839         */
 840        if (skip_prefix(cmd, "git-", &cmd)) {
 841                argv[0] = cmd;
 842                handle_builtin(argc, argv);
 843                die(_("cannot handle %s as a builtin"), cmd);
 844        }
 845
 846        /* Look for flags.. */
 847        argv++;
 848        argc--;
 849        handle_options(&argv, &argc, NULL);
 850        if (argc > 0) {
 851                /* translate --help and --version into commands */
 852                skip_prefix(argv[0], "--", &argv[0]);
 853        } else {
 854                /* The user didn't specify a command; give them help */
 855                commit_pager_choice();
 856                printf(_("usage: %s\n\n"), git_usage_string);
 857                list_common_cmds_help();
 858                printf("\n%s\n", _(git_more_info_string));
 859                exit(1);
 860        }
 861        cmd = argv[0];
 862
 863        /*
 864         * We use PATH to find git commands, but we prepend some higher
 865         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 866         * environment, and the $(gitexecdir) from the Makefile at build
 867         * time.
 868         */
 869        setup_path();
 870
 871        while (1) {
 872                int was_alias = run_argv(&argc, &argv);
 873                if (errno != ENOENT)
 874                        break;
 875                if (was_alias) {
 876                        fprintf(stderr, _("expansion of alias '%s' failed; "
 877                                          "'%s' is not a git command\n"),
 878                                cmd, argv[0]);
 879                        exit(1);
 880                }
 881                if (!done_help) {
 882                        cmd = argv[0] = help_unknown_cmd(cmd);
 883                        done_help = 1;
 884                } else
 885                        break;
 886        }
 887
 888        fprintf(stderr, _("failed to run command '%s': %s\n"),
 889                cmd, strerror(errno));
 890
 891        return 1;
 892}