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