git.oblomov.eu Git - git/blob - git.c

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