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