git.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "builtin.h"
   4 #include "config.h"
   5 #include "environment.h"
   6 #include "exec-cmd.h"
   7 #include "gettext.h"
   8 #include "help.h"
   9 #include "object-file.h"
  10 #include "pager.h"
  11 #include "read-cache-ll.h"
  12 #include "run-command.h"
  13 #include "alias.h"
  14 #include "replace-object.h"
  15 #include "setup.h"
  16 #include "attr.h"
  17 #include "shallow.h"
  18 #include "trace.h"
  19 #include "trace2.h"
  20
  21 #define RUN_SETUP               (1<<0)
  22 #define RUN_SETUP_GENTLY        (1<<1)
  23 #define USE_PAGER               (1<<2)
  24 /*
  25  * require working tree to be present -- anything uses this needs
  26  * RUN_SETUP for reading from the configuration file.
  27  */
  28 #define NEED_WORK_TREE          (1<<3)
  29 #define DELAY_PAGER_CONFIG      (1<<4)
  30 #define NO_PARSEOPT             (1<<5) /* parse-options is not used */
  31
  32 struct cmd_struct {
  33         const char *cmd;
  34         int (*fn)(int, const char **, const char *, struct repository *);
  35         unsigned int option;
  36 };
  37
  38 const char git_usage_string[] =
  39         N_("git [-v | --version] [-h | --help] [-C <path>] [-c <name>=<value>]\n"
  40            "           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
  41            "           [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--no-lazy-fetch]\n"
  42            "           [--no-optional-locks] [--no-advice] [--bare] [--git-dir=<path>]\n"
  43            "           [--work-tree=<path>] [--namespace=<name>] [--config-env=<name>=<envvar>]\n"
  44            "           <command> [<args>]");
  45
  46 const char git_more_info_string[] =
  47         N_("'git help -a' and 'git help -g' list available subcommands and some\n"
  48            "concept guides. See 'git help <command>' or 'git help <concept>'\n"
  49            "to read about a specific subcommand or concept.\n"
  50            "See 'git help git' for an overview of the system.");
  51
  52 static int use_pager = -1;
  53
  54 static void list_builtins(struct string_list *list, unsigned int exclude_option);
  55
  56 static void exclude_helpers_from_list(struct string_list *list)
  57 {
  58         int i = 0;
  59
  60         while (i < list->nr) {
  61                 if (strstr(list->items[i].string, "--"))
  62                         unsorted_string_list_delete_item(list, i, 0);
  63                 else
  64                         i++;
  65         }
  66 }
  67
  68 static int match_token(const char *spec, int len, const char *token)
  69 {
  70         int token_len = strlen(token);
  71
  72         return len == token_len && !strncmp(spec, token, token_len);
  73 }
  74
  75 static int list_cmds(const char *spec)
  76 {
  77         struct string_list list = STRING_LIST_INIT_DUP;
  78         int i;
  79         int nongit;
  80
  81         /*
  82         * Set up the repository so we can pick up any repo-level config (like
  83         * completion.commands).
  84         */
  85         setup_git_directory_gently(&nongit);
  86
  87         while (*spec) {
  88                 const char *sep = strchrnul(spec, ',');
  89                 int len = sep - spec;
  90
  91                 if (match_token(spec, len, "builtins"))
  92                         list_builtins(&list, 0);
  93                 else if (match_token(spec, len, "main"))
  94                         list_all_main_cmds(&list);
  95                 else if (match_token(spec, len, "others"))
  96                         list_all_other_cmds(&list);
  97                 else if (match_token(spec, len, "nohelpers"))
  98                         exclude_helpers_from_list(&list);
  99                 else if (match_token(spec, len, "alias"))
 100                         list_aliases(&list);
 101                 else if (match_token(spec, len, "config"))
 102                         list_cmds_by_config(&list);
 103                 else if (len > 5 && !strncmp(spec, "list-", 5)) {
 104                         struct strbuf sb = STRBUF_INIT;
 105
 106                         strbuf_add(&sb, spec + 5, len - 5);
 107                         list_cmds_by_category(&list, sb.buf);
 108                         strbuf_release(&sb);
 109                 }
 110                 else
 111                         die(_("unsupported command listing type '%s'"), spec);
 112                 spec += len;
 113                 if (*spec == ',')
 114                         spec++;
 115         }
 116         for (i = 0; i < list.nr; i++)
 117                 puts(list.items[i].string);
 118         string_list_clear(&list, 0);
 119         return 0;
 120 }
 121
 122 static void commit_pager_choice(void)
 123 {
 124         switch (use_pager) {
 125         case 0:
 126                 setenv("GIT_PAGER", "cat", 1);
 127                 break;
 128         case 1:
 129                 setup_pager();
 130                 break;
 131         default:
 132                 break;
 133         }
 134 }
 135
 136 void setup_auto_pager(const char *cmd, int def)
 137 {
 138         if (use_pager != -1 || pager_in_use())
 139                 return;
 140         use_pager = check_pager_config(cmd);
 141         if (use_pager == -1)
 142                 use_pager = def;
 143         commit_pager_choice();
 144 }
 145
 146 static void print_system_path(const char *path)
 147 {
 148         char *s_path = system_path(path);
 149         puts(s_path);
 150         free(s_path);
 151 }
 152
 153 static int handle_options(const char ***argv, int *argc, int *envchanged)
 154 {
 155         const char **orig_argv = *argv;
 156
 157         while (*argc > 0) {
 158                 const char *cmd = (*argv)[0];
 159                 if (cmd[0] != '-')
 160                         break;
 161
 162                 /*
 163                  * For legacy reasons, the "version" and "help"
 164                  * commands can be written with "--" prepended
 165                  * to make them look like flags.
 166                  */
 167                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h") ||
 168                     !strcmp(cmd, "--version") || !strcmp(cmd, "-v"))
 169                         break;
 170
 171                 /*
 172                  * Check remaining flags.
 173                  */
 174                 if (skip_prefix(cmd, "--exec-path", &cmd)) {
 175                         if (*cmd == '=')
 176                                 git_set_exec_path(cmd + 1);
 177                         else {
 178                                 puts(git_exec_path());
 179                                 trace2_cmd_name("_query_");
 180                                 exit(0);
 181                         }
 182                 } else if (!strcmp(cmd, "--html-path")) {
 183                         print_system_path(GIT_HTML_PATH);
 184                         trace2_cmd_name("_query_");
 185                         exit(0);
 186                 } else if (!strcmp(cmd, "--man-path")) {
 187                         print_system_path(GIT_MAN_PATH);
 188                         trace2_cmd_name("_query_");
 189                         exit(0);
 190                 } else if (!strcmp(cmd, "--info-path")) {
 191                         print_system_path(GIT_INFO_PATH);
 192                         trace2_cmd_name("_query_");
 193                         exit(0);
 194                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 195                         use_pager = 1;
 196                 } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) {
 197                         use_pager = 0;
 198                         if (envchanged)
 199                                 *envchanged = 1;
 200                 } else if (!strcmp(cmd, "--no-lazy-fetch")) {
 201                         fetch_if_missing = 0;
 202                         setenv(NO_LAZY_FETCH_ENVIRONMENT, "1", 1);
 203                         if (envchanged)
 204                                 *envchanged = 1;
 205                 } else if (!strcmp(cmd, "--no-replace-objects")) {
 206                         disable_replace_refs();
 207                         setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
 208                         if (envchanged)
 209                                 *envchanged = 1;
 210                 } else if (!strcmp(cmd, "--git-dir")) {
 211                         if (*argc < 2) {
 212                                 fprintf(stderr, _("no directory given for '%s' option\n" ), "--git-dir");
 213                                 usage(git_usage_string);
 214                         }
 215                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 216                         if (envchanged)
 217                                 *envchanged = 1;
 218                         (*argv)++;
 219                         (*argc)--;
 220                 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
 221                         setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
 222                         if (envchanged)
 223                                 *envchanged = 1;
 224                 } else if (!strcmp(cmd, "--namespace")) {
 225                         if (*argc < 2) {
 226                                 fprintf(stderr, _("no namespace given for --namespace\n" ));
 227                                 usage(git_usage_string);
 228                         }
 229                         setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 230                         if (envchanged)
 231                                 *envchanged = 1;
 232                         (*argv)++;
 233                         (*argc)--;
 234                 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
 235                         setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
 236                         if (envchanged)
 237                                 *envchanged = 1;
 238                 } else if (!strcmp(cmd, "--work-tree")) {
 239                         if (*argc < 2) {
 240                                 fprintf(stderr, _("no directory given for '%s' option\n" ), "--work-tree");
 241                                 usage(git_usage_string);
 242                         }
 243                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 244                         if (envchanged)
 245                                 *envchanged = 1;
 246                         (*argv)++;
 247                         (*argc)--;
 248                 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
 249                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
 250                         if (envchanged)
 251                                 *envchanged = 1;
 252                 } else if (!strcmp(cmd, "--bare")) {
 253                         char *cwd = xgetcwd();
 254                         is_bare_repository_cfg = 1;
 255                         setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
 256                         free(cwd);
 257                         setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
 258                         if (envchanged)
 259                                 *envchanged = 1;
 260                 } else if (!strcmp(cmd, "-c")) {
 261                         if (*argc < 2) {
 262                                 fprintf(stderr, _("-c expects a configuration string\n" ));
 263                                 usage(git_usage_string);
 264                         }
 265                         git_config_push_parameter((*argv)[1]);
 266                         (*argv)++;
 267                         (*argc)--;
 268                 } else if (!strcmp(cmd, "--config-env")) {
 269                         if (*argc < 2) {
 270                                 fprintf(stderr, _("no config key given for --config-env\n" ));
 271                                 usage(git_usage_string);
 272                         }
 273                         git_config_push_env((*argv)[1]);
 274                         (*argv)++;
 275                         (*argc)--;
 276                 } else if (skip_prefix(cmd, "--config-env=", &cmd)) {
 277                         git_config_push_env(cmd);
 278                 } else if (!strcmp(cmd, "--literal-pathspecs")) {
 279                         setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
 280                         if (envchanged)
 281                                 *envchanged = 1;
 282                 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
 283                         setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
 284                         if (envchanged)
 285                                 *envchanged = 1;
 286                 } else if (!strcmp(cmd, "--glob-pathspecs")) {
 287                         setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 288                         if (envchanged)
 289                                 *envchanged = 1;
 290                 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
 291                         setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 292                         if (envchanged)
 293                                 *envchanged = 1;
 294                 } else if (!strcmp(cmd, "--icase-pathspecs")) {
 295                         setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
 296                         if (envchanged)
 297                                 *envchanged = 1;
 298                 } else if (!strcmp(cmd, "--no-optional-locks")) {
 299                         setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
 300                         if (envchanged)
 301                                 *envchanged = 1;
 302                 } else if (!strcmp(cmd, "--shallow-file")) {
 303                         (*argv)++;
 304                         (*argc)--;
 305                         set_alternate_shallow_file(the_repository, (*argv)[0], 1);
 306                         if (envchanged)
 307                                 *envchanged = 1;
 308                 } else if (!strcmp(cmd, "-C")) {
 309                         if (*argc < 2) {
 310                                 fprintf(stderr, _("no directory given for '%s' option\n" ), "-C");
 311                                 usage(git_usage_string);
 312                         }
 313                         if ((*argv)[1][0]) {
 314                                 if (chdir((*argv)[1]))
 315                                         die_errno("cannot change to '%s'", (*argv)[1]);
 316                                 if (envchanged)
 317                                         *envchanged = 1;
 318                         }
 319                         (*argv)++;
 320                         (*argc)--;
 321                 } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
 322                         trace2_cmd_name("_query_");
 323                         if (!strcmp(cmd, "parseopt")) {
 324                                 struct string_list list = STRING_LIST_INIT_DUP;
 325                                 int i;
 326
 327                                 list_builtins(&list, NO_PARSEOPT);
 328                                 for (i = 0; i < list.nr; i++)
 329                                         printf("%s ", list.items[i].string);
 330                                 string_list_clear(&list, 0);
 331                                 exit(0);
 332                         } else {
 333                                 exit(list_cmds(cmd));
 334                         }
 335                 } else if (!strcmp(cmd, "--attr-source")) {
 336                         if (*argc < 2) {
 337                                 fprintf(stderr, _("no attribute source given for --attr-source\n" ));
 338                                 usage(git_usage_string);
 339                         }
 340                         setenv(GIT_ATTR_SOURCE_ENVIRONMENT, (*argv)[1], 1);
 341                         if (envchanged)
 342                                 *envchanged = 1;
 343                         (*argv)++;
 344                         (*argc)--;
 345                 } else if (skip_prefix(cmd, "--attr-source=", &cmd)) {
 346                         set_git_attr_source(cmd);
 347                         setenv(GIT_ATTR_SOURCE_ENVIRONMENT, cmd, 1);
 348                         if (envchanged)
 349                                 *envchanged = 1;
 350                 } else if (!strcmp(cmd, "--no-advice")) {
 351                         setenv(GIT_ADVICE_ENVIRONMENT, "0", 1);
 352                         if (envchanged)
 353                                 *envchanged = 1;
 354                 } else {
 355                         fprintf(stderr, _("unknown option: %s\n"), cmd);
 356                         usage(git_usage_string);
 357                 }
 358
 359                 (*argv)++;
 360                 (*argc)--;
 361         }
 362         return (*argv) - orig_argv;
 363 }
 364
 365 static int handle_alias(int *argcp, const char ***argv)
 366 {
 367         int envchanged = 0, ret = 0, saved_errno = errno;
 368         int count, option_count;
 369         const char **new_argv;
 370         const char *alias_command;
 371         char *alias_string;
 372
 373         alias_command = (*argv)[0];
 374         alias_string = alias_lookup(alias_command);
 375         if (alias_string) {
 376                 if (*argcp > 1 && !strcmp((*argv)[1], "-h"))
 377                         fprintf_ln(stderr, _("'%s' is aliased to '%s'"),
 378                                    alias_command, alias_string);
 379                 if (alias_string[0] == '!') {
 380                         struct child_process child = CHILD_PROCESS_INIT;
 381                         int nongit_ok;
 382
 383                         /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
 384                         setup_git_directory_gently(&nongit_ok);
 385
 386                         commit_pager_choice();
 387
 388                         child.use_shell = 1;
 389                         child.clean_on_exit = 1;
 390                         child.wait_after_clean = 1;
 391                         child.trace2_child_class = "shell_alias";
 392                         strvec_push(&child.args, alias_string + 1);
 393                         strvec_pushv(&child.args, (*argv) + 1);
 394
 395                         trace2_cmd_alias(alias_command, child.args.v);
 396                         trace2_cmd_name("_run_shell_alias_");
 397
 398                         ret = run_command(&child);
 399                         if (ret >= 0)   /* normal exit */
 400                                 exit(ret);
 401
 402                         die_errno(_("while expanding alias '%s': '%s'"),
 403                                   alias_command, alias_string + 1);
 404                 }
 405                 count = split_cmdline(alias_string, &new_argv);
 406                 if (count < 0)
 407                         die(_("bad alias.%s string: %s"), alias_command,
 408                             _(split_cmdline_strerror(count)));
 409                 option_count = handle_options(&new_argv, &count, &envchanged);
 410                 if (envchanged)
 411                         die(_("alias '%s' changes environment variables.\n"
 412                               "You can use '!git' in the alias to do this"),
 413                             alias_command);
 414                 MOVE_ARRAY(new_argv - option_count, new_argv, count);
 415                 new_argv -= option_count;
 416
 417                 if (count < 1)
 418                         die(_("empty alias for %s"), alias_command);
 419
 420                 if (!strcmp(alias_command, new_argv[0]))
 421                         die(_("recursive alias: %s"), alias_command);
 422
 423                 trace_argv_printf(new_argv,
 424                                   "trace: alias expansion: %s =>",
 425                                   alias_command);
 426
 427                 REALLOC_ARRAY(new_argv, count + *argcp);
 428                 /* insert after command name */
 429                 COPY_ARRAY(new_argv + count, *argv + 1, *argcp);
 430
 431                 trace2_cmd_alias(alias_command, new_argv);
 432
 433                 *argv = new_argv;
 434                 *argcp += count - 1;
 435
 436                 ret = 1;
 437         }
 438
 439         errno = saved_errno;
 440
 441         return ret;
 442 }
 443
 444 static int run_builtin(struct cmd_struct *p, int argc, const char **argv, struct repository *repo)
 445 {
 446         int status, help;
 447         int no_repo = 1;
 448         struct stat st;
 449         const char *prefix;
 450         int run_setup = (p->option & (RUN_SETUP | RUN_SETUP_GENTLY));
 451
 452         help = argc == 2 && !strcmp(argv[1], "-h");
 453         if (help && (run_setup & RUN_SETUP))
 454                 /* demote to GENTLY to allow 'git cmd -h' outside repo */
 455                 run_setup = RUN_SETUP_GENTLY;
 456
 457         if (run_setup & RUN_SETUP) {
 458                 prefix = setup_git_directory();
 459                 no_repo = 0;
 460         } else if (run_setup & RUN_SETUP_GENTLY) {
 461                 prefix = setup_git_directory_gently(&no_repo);
 462         } else {
 463                 prefix = NULL;
 464         }
 465         assert(!prefix || *prefix);
 466         precompose_argv_prefix(argc, argv, NULL);
 467         if (use_pager == -1 && run_setup &&
 468                 !(p->option & DELAY_PAGER_CONFIG))
 469                 use_pager = check_pager_config(p->cmd);
 470         if (use_pager == -1 && p->option & USE_PAGER)
 471                 use_pager = 1;
 472         if (run_setup && startup_info->have_repository)
 473                 /* get_git_dir() may set up repo, avoid that */
 474                 trace_repo_setup();
 475         commit_pager_choice();
 476
 477         if (!help && p->option & NEED_WORK_TREE)
 478                 setup_work_tree();
 479
 480         trace_argv_printf(argv, "trace: built-in: git");
 481         trace2_cmd_name(p->cmd);
 482
 483         validate_cache_entries(repo->index);
 484         status = p->fn(argc, argv, prefix, no_repo ? NULL : repo);
 485         validate_cache_entries(repo->index);
 486
 487         if (status)
 488                 return status;
 489
 490         /* Somebody closed stdout? */
 491         if (fstat(fileno(stdout), &st))
 492                 return 0;
 493         /* Ignore write errors for pipes and sockets.. */
 494         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 495                 return 0;
 496
 497         /* Check for ENOSPC and EIO errors.. */
 498         if (fflush(stdout))
 499                 die_errno(_("write failure on standard output"));
 500         if (ferror(stdout))
 501                 die(_("unknown write failure on standard output"));
 502         if (fclose(stdout))
 503                 die_errno(_("close failed on standard output"));
 504         return 0;
 505 }
 506
 507 static struct cmd_struct commands[] = {
 508         { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 509         { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 510         { "annotate", cmd_annotate, RUN_SETUP },
 511         { "apply", cmd_apply, RUN_SETUP_GENTLY },
 512         { "archive", cmd_archive, RUN_SETUP_GENTLY },
 513         { "bisect", cmd_bisect, RUN_SETUP },
 514         { "blame", cmd_blame, RUN_SETUP },
 515         { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
 516         { "bugreport", cmd_bugreport, RUN_SETUP_GENTLY },
 517         { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 518         { "cat-file", cmd_cat_file, RUN_SETUP },
 519         { "check-attr", cmd_check_attr, RUN_SETUP },
 520         { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
 521         { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
 522         { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT  },
 523         { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 524         { "checkout--worker", cmd_checkout__worker,
 525                 RUN_SETUP | NEED_WORK_TREE },
 526         { "checkout-index", cmd_checkout_index,
 527                 RUN_SETUP | NEED_WORK_TREE},
 528         { "cherry", cmd_cherry, RUN_SETUP },
 529         { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 530         { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 531         { "clone", cmd_clone },
 532         { "column", cmd_column, RUN_SETUP_GENTLY },
 533         { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 534         { "commit-graph", cmd_commit_graph, RUN_SETUP },
 535         { "commit-tree", cmd_commit_tree, RUN_SETUP },
 536         { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
 537         { "count-objects", cmd_count_objects, RUN_SETUP },
 538         { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
 539         { "credential-cache", cmd_credential_cache },
 540         { "credential-cache--daemon", cmd_credential_cache_daemon },
 541         { "credential-store", cmd_credential_store },
 542         { "describe", cmd_describe, RUN_SETUP },
 543         { "diagnose", cmd_diagnose, RUN_SETUP_GENTLY },
 544         { "diff", cmd_diff, NO_PARSEOPT },
 545         { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 546         { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
 547         { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
 548         { "difftool", cmd_difftool, RUN_SETUP_GENTLY },
 549         { "fast-export", cmd_fast_export, RUN_SETUP },
 550         { "fast-import", cmd_fast_import, RUN_SETUP | NO_PARSEOPT },
 551         { "fetch", cmd_fetch, RUN_SETUP },
 552         { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
 553         { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 554         { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 555         { "for-each-repo", cmd_for_each_repo, RUN_SETUP_GENTLY },
 556         { "format-patch", cmd_format_patch, RUN_SETUP },
 557         { "fsck", cmd_fsck, RUN_SETUP },
 558         { "fsck-objects", cmd_fsck, RUN_SETUP },
 559         { "fsmonitor--daemon", cmd_fsmonitor__daemon, RUN_SETUP },
 560         { "gc", cmd_gc, RUN_SETUP },
 561         { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
 562         { "grep", cmd_grep, RUN_SETUP_GENTLY },
 563         { "hash-object", cmd_hash_object },
 564         { "help", cmd_help },
 565         { "hook", cmd_hook, RUN_SETUP },
 566         { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
 567         { "init", cmd_init_db },
 568         { "init-db", cmd_init_db },
 569         { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
 570         { "log", cmd_log, RUN_SETUP },
 571         { "ls-files", cmd_ls_files, RUN_SETUP },
 572         { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 573         { "ls-tree", cmd_ls_tree, RUN_SETUP },
 574         { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
 575         { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
 576         { "maintenance", cmd_maintenance, RUN_SETUP },
 577         { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 578         { "merge-base", cmd_merge_base, RUN_SETUP },
 579         { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 580         { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
 581         { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
 582         { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 583         { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 584         { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 585         { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
 586         { "merge-tree", cmd_merge_tree, RUN_SETUP },
 587         { "mktag", cmd_mktag, RUN_SETUP },
 588         { "mktree", cmd_mktree, RUN_SETUP },
 589         { "multi-pack-index", cmd_multi_pack_index, RUN_SETUP },
 590         { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 591         { "name-rev", cmd_name_rev, RUN_SETUP },
 592         { "notes", cmd_notes, RUN_SETUP },
 593         { "pack-objects", cmd_pack_objects, RUN_SETUP },
 594         { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
 595         { "pack-refs", cmd_pack_refs, RUN_SETUP },
 596         { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
 597         { "pickaxe", cmd_blame, RUN_SETUP },
 598         { "prune", cmd_prune, RUN_SETUP },
 599         { "prune-packed", cmd_prune_packed, RUN_SETUP },
 600         { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
 601         { "push", cmd_push, RUN_SETUP },
 602         { "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER },
 603         { "read-tree", cmd_read_tree, RUN_SETUP },
 604         { "rebase", cmd_rebase, RUN_SETUP | NEED_WORK_TREE },
 605         { "receive-pack", cmd_receive_pack },
 606         { "reflog", cmd_reflog, RUN_SETUP },
 607         { "refs", cmd_refs, RUN_SETUP },
 608         { "remote", cmd_remote, RUN_SETUP },
 609         { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
 610         { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
 611         { "repack", cmd_repack, RUN_SETUP },
 612         { "replace", cmd_replace, RUN_SETUP },
 613         { "replay", cmd_replay, RUN_SETUP },
 614         { "rerere", cmd_rerere, RUN_SETUP },
 615         { "reset", cmd_reset, RUN_SETUP },
 616         { "restore", cmd_restore, RUN_SETUP | NEED_WORK_TREE },
 617         { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
 618         { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
 619         { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 620         { "rm", cmd_rm, RUN_SETUP },
 621         { "send-pack", cmd_send_pack, RUN_SETUP },
 622         { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 623         { "show", cmd_show, RUN_SETUP },
 624         { "show-branch", cmd_show_branch, RUN_SETUP },
 625         { "show-index", cmd_show_index, RUN_SETUP_GENTLY },
 626         { "show-ref", cmd_show_ref, RUN_SETUP },
 627         { "sparse-checkout", cmd_sparse_checkout, RUN_SETUP },
 628         { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 629         { "stash", cmd_stash, RUN_SETUP | NEED_WORK_TREE },
 630         { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 631         { "stripspace", cmd_stripspace },
 632         { "submodule--helper", cmd_submodule__helper, RUN_SETUP },
 633         { "switch", cmd_switch, RUN_SETUP | NEED_WORK_TREE },
 634         { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 635         { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
 636         { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
 637         { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
 638         { "update-index", cmd_update_index, RUN_SETUP },
 639         { "update-ref", cmd_update_ref, RUN_SETUP },
 640         { "update-server-info", cmd_update_server_info, RUN_SETUP },
 641         { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
 642         { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
 643         { "upload-pack", cmd_upload_pack },
 644         { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
 645         { "verify-commit", cmd_verify_commit, RUN_SETUP },
 646         { "verify-pack", cmd_verify_pack },
 647         { "verify-tag", cmd_verify_tag, RUN_SETUP },
 648         { "version", cmd_version },
 649         { "whatchanged", cmd_whatchanged, RUN_SETUP },
 650         { "worktree", cmd_worktree, RUN_SETUP },
 651         { "write-tree", cmd_write_tree, RUN_SETUP },
 652 };
 653
 654 static struct cmd_struct *get_builtin(const char *s)
 655 {
 656         int i;
 657         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 658                 struct cmd_struct *p = commands + i;
 659                 if (!strcmp(s, p->cmd))
 660                         return p;
 661         }
 662         return NULL;
 663 }
 664
 665 int is_builtin(const char *s)
 666 {
 667         return !!get_builtin(s);
 668 }
 669
 670 static void list_builtins(struct string_list *out, unsigned int exclude_option)
 671 {
 672         int i;
 673         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 674                 if (exclude_option &&
 675                     (commands[i].option & exclude_option))
 676                         continue;
 677                 string_list_append(out, commands[i].cmd);
 678         }
 679 }
 680
 681 void load_builtin_commands(const char *prefix, struct cmdnames *cmds)
 682 {
 683         const char *name;
 684         int i;
 685
 686         /*
 687          * Callers can ask for a subset of the commands based on a certain
 688          * prefix, which is then dropped from the added names. The names in
 689          * the `commands[]` array do not have the `git-` prefix, though,
 690          * therefore we must expect the `prefix` to at least start with `git-`.
 691          */
 692         if (!skip_prefix(prefix, "git-", &prefix))
 693                 BUG("prefix '%s' must start with 'git-'", prefix);
 694
 695         for (i = 0; i < ARRAY_SIZE(commands); i++)
 696                 if (skip_prefix(commands[i].cmd, prefix, &name))
 697                         add_cmdname(cmds, name, strlen(name));
 698 }
 699
 700 #ifdef STRIP_EXTENSION
 701 static void strip_extension(const char **argv)
 702 {
 703         size_t len;
 704
 705         if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
 706                 argv[0] = xmemdupz(argv[0], len);
 707 }
 708 #else
 709 #define strip_extension(cmd)
 710 #endif
 711
 712 static void handle_builtin(int argc, const char **argv)
 713 {
 714         struct strvec args = STRVEC_INIT;
 715         const char **argv_copy = NULL;
 716         const char *cmd;
 717         struct cmd_struct *builtin;
 718
 719         strip_extension(argv);
 720         cmd = argv[0];
 721
 722         /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
 723         if (argc > 1 && !strcmp(argv[1], "--help")) {
 724                 int i;
 725
 726                 argv[1] = argv[0];
 727                 argv[0] = cmd = "help";
 728
 729                 for (i = 0; i < argc; i++) {
 730                         strvec_push(&args, argv[i]);
 731                         if (!i)
 732                                 strvec_push(&args, "--exclude-guides");
 733                 }
 734
 735                 argc++;
 736
 737                 /*
 738                  * `run_builtin()` will modify the argv array, so we need to
 739                  * create a shallow copy such that we can free all of its
 740                  * strings.
 741                  */
 742                 CALLOC_ARRAY(argv_copy, argc + 1);
 743                 COPY_ARRAY(argv_copy, args.v, argc);
 744
 745                 argv = argv_copy;
 746         }
 747
 748         builtin = get_builtin(cmd);
 749         if (builtin) {
 750                 int ret = run_builtin(builtin, argc, argv, the_repository);
 751                 strvec_clear(&args);
 752                 free(argv_copy);
 753                 exit(ret);
 754         }
 755
 756         strvec_clear(&args);
 757         free(argv_copy);
 758 }
 759
 760 static void execv_dashed_external(const char **argv)
 761 {
 762         struct child_process cmd = CHILD_PROCESS_INIT;
 763         int status;
 764
 765         if (use_pager == -1 && !is_builtin(argv[0]))
 766                 use_pager = check_pager_config(argv[0]);
 767         commit_pager_choice();
 768
 769         strvec_pushf(&cmd.args, "git-%s", argv[0]);
 770         strvec_pushv(&cmd.args, argv + 1);
 771         cmd.clean_on_exit = 1;
 772         cmd.wait_after_clean = 1;
 773         cmd.silent_exec_failure = 1;
 774         cmd.trace2_child_class = "dashed";
 775
 776         trace2_cmd_name("_run_dashed_");
 777
 778         /*
 779          * The code in run_command() logs trace2 child_start/child_exit
 780          * events, so we do not need to report exec/exec_result events here.
 781          */
 782         trace_argv_printf(cmd.args.v, "trace: exec:");
 783
 784         /*
 785          * If we fail because the command is not found, it is
 786          * OK to return. Otherwise, we just pass along the status code,
 787          * or our usual generic code if we were not even able to exec
 788          * the program.
 789          */
 790         status = run_command(&cmd);
 791
 792         /*
 793          * If the child process ran and we are now going to exit, emit a
 794          * generic string as our trace2 command verb to indicate that we
 795          * launched a dashed command.
 796          */
 797         if (status >= 0)
 798                 exit(status);
 799         else if (errno != ENOENT)
 800                 exit(128);
 801 }
 802
 803 static int run_argv(int *argcp, const char ***argv)
 804 {
 805         int done_alias = 0;
 806         struct string_list cmd_list = STRING_LIST_INIT_NODUP;
 807         struct string_list_item *seen;
 808
 809         while (1) {
 810                 /*
 811                  * If we tried alias and futzed with our environment,
 812                  * it no longer is safe to invoke builtins directly in
 813                  * general.  We have to spawn them as dashed externals.
 814                  *
 815                  * NEEDSWORK: if we can figure out cases
 816                  * where it is safe to do, we can avoid spawning a new
 817                  * process.
 818                  */
 819                 if (!done_alias)
 820                         handle_builtin(*argcp, *argv);
 821                 else if (get_builtin(**argv)) {
 822                         struct child_process cmd = CHILD_PROCESS_INIT;
 823                         int i;
 824
 825                         /*
 826                          * The current process is committed to launching a
 827                          * child process to run the command named in (**argv)
 828                          * and exiting.  Log a generic string as the trace2
 829                          * command verb to indicate this.  Note that the child
 830                          * process will log the actual verb when it runs.
 831                          */
 832                         trace2_cmd_name("_run_git_alias_");
 833
 834                         commit_pager_choice();
 835
 836                         strvec_push(&cmd.args, "git");
 837                         for (i = 0; i < *argcp; i++)
 838                                 strvec_push(&cmd.args, (*argv)[i]);
 839
 840                         trace_argv_printf(cmd.args.v, "trace: exec:");
 841
 842                         /*
 843                          * if we fail because the command is not found, it is
 844                          * OK to return. Otherwise, we just pass along the status code.
 845                          */
 846                         cmd.silent_exec_failure = 1;
 847                         cmd.clean_on_exit = 1;
 848                         cmd.wait_after_clean = 1;
 849                         cmd.trace2_child_class = "git_alias";
 850                         i = run_command(&cmd);
 851                         if (i >= 0 || errno != ENOENT)
 852                                 exit(i);
 853                         die("could not execute builtin %s", **argv);
 854                 }
 855
 856                 /* .. then try the external ones */
 857                 execv_dashed_external(*argv);
 858
 859                 seen = unsorted_string_list_lookup(&cmd_list, *argv[0]);
 860                 if (seen) {
 861                         int i;
 862                         struct strbuf sb = STRBUF_INIT;
 863                         for (i = 0; i < cmd_list.nr; i++) {
 864                                 struct string_list_item *item = &cmd_list.items[i];
 865
 866                                 strbuf_addf(&sb, "\n  %s", item->string);
 867                                 if (item == seen)
 868                                         strbuf_addstr(&sb, " <==");
 869                                 else if (i == cmd_list.nr - 1)
 870                                         strbuf_addstr(&sb, " ==>");
 871                         }
 872                         die(_("alias loop detected: expansion of '%s' does"
 873                               " not terminate:%s"), cmd_list.items[0].string, sb.buf);
 874                 }
 875
 876                 string_list_append(&cmd_list, *argv[0]);
 877
 878                 /*
 879                  * It could be an alias -- this works around the insanity
 880                  * of overriding "git log" with "git show" by having
 881                  * alias.log = show
 882                  */
 883                 if (!handle_alias(argcp, argv))
 884                         break;
 885                 done_alias = 1;
 886         }
 887
 888         string_list_clear(&cmd_list, 0);
 889
 890         return done_alias;
 891 }
 892
 893 int cmd_main(int argc, const char **argv)
 894 {
 895         const char *cmd;
 896         int done_help = 0;
 897
 898         cmd = argv[0];
 899         if (!cmd)
 900                 cmd = "git-help";
 901         else {
 902                 const char *slash = find_last_dir_sep(cmd);
 903                 if (slash)
 904                         cmd = slash + 1;
 905         }
 906
 907         trace_command_performance(argv);
 908
 909         /*
 910          * "git-xxxx" is the same as "git xxxx", but we obviously:
 911          *
 912          *  - cannot take flags in between the "git" and the "xxxx".
 913          *  - cannot execute it externally (since it would just do
 914          *    the same thing over again)
 915          *
 916          * So we just directly call the builtin handler, and die if
 917          * that one cannot handle it.
 918          */
 919         if (skip_prefix(cmd, "git-", &cmd)) {
 920                 argv[0] = cmd;
 921                 handle_builtin(argc, argv);
 922                 die(_("cannot handle %s as a builtin"), cmd);
 923         }
 924
 925         /* Look for flags.. */
 926         argv++;
 927         argc--;
 928         handle_options(&argv, &argc, NULL);
 929
 930         if (!argc) {
 931                 /* The user didn't specify a command; give them help */
 932                 commit_pager_choice();
 933                 printf(_("usage: %s\n\n"), git_usage_string);
 934                 list_common_cmds_help();
 935                 printf("\n%s\n", _(git_more_info_string));
 936                 exit(1);
 937         }
 938
 939         if (!strcmp("--version", argv[0]) || !strcmp("-v", argv[0]))
 940                 argv[0] = "version";
 941         else if (!strcmp("--help", argv[0]) || !strcmp("-h", argv[0]))
 942                 argv[0] = "help";
 943
 944         cmd = argv[0];
 945
 946         /*
 947          * We use PATH to find git commands, but we prepend some higher
 948          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 949          * environment, and the $(gitexecdir) from the Makefile at build
 950          * time.
 951          */
 952         setup_path();
 953
 954         while (1) {
 955                 int was_alias = run_argv(&argc, &argv);
 956                 if (errno != ENOENT)
 957                         break;
 958                 if (was_alias) {
 959                         fprintf(stderr, _("expansion of alias '%s' failed; "
 960                                           "'%s' is not a git command\n"),
 961                                 cmd, argv[0]);
 962                         exit(1);
 963                 }
 964                 if (!done_help) {
 965                         cmd = argv[0] = help_unknown_cmd(cmd);
 966                         done_help = 1;
 967                 } else
 968                         break;
 969         }
 970
 971         fprintf(stderr, _("failed to run command '%s': %s\n"),
 972                 cmd, strerror(errno));
 973
 974         return 1;
 975 }