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