git.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "exec_cmd.h"
   4 #include "help.h"
   5 #include "quote.h"
   6 #include "run-command.h"
   7 #include "commit.h"
   8
   9 const char git_usage_string[] =
  10         "git [--version] [--help] [-C <path>] [-c name=value]\n"
  11         "           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
  12         "           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
  13         "           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
  14         "           <command> [<args>]";
  15
  16 const char git_more_info_string[] =
  17         N_("'git help -a' and 'git help -g' lists available subcommands and some\n"
  18            "concept guides. See 'git help <command>' or 'git help <concept>'\n"
  19            "to read about a specific subcommand or concept.");
  20
  21 static struct startup_info git_startup_info;
  22 static int use_pager = -1;
  23
  24 static void commit_pager_choice(void) {
  25         switch (use_pager) {
  26         case 0:
  27                 setenv("GIT_PAGER", "cat", 1);
  28                 break;
  29         case 1:
  30                 setup_pager();
  31                 break;
  32         default:
  33                 break;
  34         }
  35 }
  36
  37 static int handle_options(const char ***argv, int *argc, int *envchanged)
  38 {
  39         const char **orig_argv = *argv;
  40
  41         while (*argc > 0) {
  42                 const char *cmd = (*argv)[0];
  43                 if (cmd[0] != '-')
  44                         break;
  45
  46                 /*
  47                  * For legacy reasons, the "version" and "help"
  48                  * commands can be written with "--" prepended
  49                  * to make them look like flags.
  50                  */
  51                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  52                         break;
  53
  54                 /*
  55                  * Check remaining flags.
  56                  */
  57                 if (skip_prefix(cmd, "--exec-path", &cmd)) {
  58                         if (*cmd == '=')
  59                                 git_set_argv_exec_path(cmd + 1);
  60                         else {
  61                                 puts(git_exec_path());
  62                                 exit(0);
  63                         }
  64                 } else if (!strcmp(cmd, "--html-path")) {
  65                         puts(system_path(GIT_HTML_PATH));
  66                         exit(0);
  67                 } else if (!strcmp(cmd, "--man-path")) {
  68                         puts(system_path(GIT_MAN_PATH));
  69                         exit(0);
  70                 } else if (!strcmp(cmd, "--info-path")) {
  71                         puts(system_path(GIT_INFO_PATH));
  72                         exit(0);
  73                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  74                         use_pager = 1;
  75                 } else if (!strcmp(cmd, "--no-pager")) {
  76                         use_pager = 0;
  77                         if (envchanged)
  78                                 *envchanged = 1;
  79                 } else if (!strcmp(cmd, "--no-replace-objects")) {
  80                         check_replace_refs = 0;
  81                         setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  82                         if (envchanged)
  83                                 *envchanged = 1;
  84                 } else if (!strcmp(cmd, "--git-dir")) {
  85                         if (*argc < 2) {
  86                                 fprintf(stderr, "No directory given for --git-dir.\n" );
  87                                 usage(git_usage_string);
  88                         }
  89                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  90                         if (envchanged)
  91                                 *envchanged = 1;
  92                         (*argv)++;
  93                         (*argc)--;
  94                 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
  95                         setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
  96                         if (envchanged)
  97                                 *envchanged = 1;
  98                 } else if (!strcmp(cmd, "--namespace")) {
  99                         if (*argc < 2) {
 100                                 fprintf(stderr, "No namespace given for --namespace.\n" );
 101                                 usage(git_usage_string);
 102                         }
 103                         setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 104                         if (envchanged)
 105                                 *envchanged = 1;
 106                         (*argv)++;
 107                         (*argc)--;
 108                 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
 109                         setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
 110                         if (envchanged)
 111                                 *envchanged = 1;
 112                 } else if (!strcmp(cmd, "--work-tree")) {
 113                         if (*argc < 2) {
 114                                 fprintf(stderr, "No directory given for --work-tree.\n" );
 115                                 usage(git_usage_string);
 116                         }
 117                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 118                         if (envchanged)
 119                                 *envchanged = 1;
 120                         (*argv)++;
 121                         (*argc)--;
 122                 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
 123                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
 124                         if (envchanged)
 125                                 *envchanged = 1;
 126                 } else if (!strcmp(cmd, "--bare")) {
 127                         static char git_dir[PATH_MAX+1];
 128                         is_bare_repository_cfg = 1;
 129                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 130                         setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
 131                         if (envchanged)
 132                                 *envchanged = 1;
 133                 } else if (!strcmp(cmd, "-c")) {
 134                         if (*argc < 2) {
 135                                 fprintf(stderr, "-c expects a configuration string\n" );
 136                                 usage(git_usage_string);
 137                         }
 138                         git_config_push_parameter((*argv)[1]);
 139                         (*argv)++;
 140                         (*argc)--;
 141                 } else if (!strcmp(cmd, "--literal-pathspecs")) {
 142                         setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
 143                         if (envchanged)
 144                                 *envchanged = 1;
 145                 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
 146                         setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
 147                         if (envchanged)
 148                                 *envchanged = 1;
 149                 } else if (!strcmp(cmd, "--glob-pathspecs")) {
 150                         setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 151                         if (envchanged)
 152                                 *envchanged = 1;
 153                 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
 154                         setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
 155                         if (envchanged)
 156                                 *envchanged = 1;
 157                 } else if (!strcmp(cmd, "--icase-pathspecs")) {
 158                         setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
 159                         if (envchanged)
 160                                 *envchanged = 1;
 161                 } else if (!strcmp(cmd, "--shallow-file")) {
 162                         (*argv)++;
 163                         (*argc)--;
 164                         set_alternate_shallow_file((*argv)[0], 1);
 165                         if (envchanged)
 166                                 *envchanged = 1;
 167                 } else if (!strcmp(cmd, "-C")) {
 168                         if (*argc < 2) {
 169                                 fprintf(stderr, "No directory given for -C.\n" );
 170                                 usage(git_usage_string);
 171                         }
 172                         if (chdir((*argv)[1]))
 173                                 die_errno("Cannot change to '%s'", (*argv)[1]);
 174                         if (envchanged)
 175                                 *envchanged = 1;
 176                         (*argv)++;
 177                         (*argc)--;
 178                 } else {
 179                         fprintf(stderr, "Unknown option: %s\n", cmd);
 180                         usage(git_usage_string);
 181                 }
 182
 183                 (*argv)++;
 184                 (*argc)--;
 185         }
 186         return (*argv) - orig_argv;
 187 }
 188
 189 static int handle_alias(int *argcp, const char ***argv)
 190 {
 191         int envchanged = 0, ret = 0, saved_errno = errno;
 192         const char *subdir;
 193         int count, option_count;
 194         const char **new_argv;
 195         const char *alias_command;
 196         char *alias_string;
 197         int unused_nongit;
 198
 199         subdir = setup_git_directory_gently(&unused_nongit);
 200
 201         alias_command = (*argv)[0];
 202         alias_string = alias_lookup(alias_command);
 203         if (alias_string) {
 204                 if (alias_string[0] == '!') {
 205                         const char **alias_argv;
 206                         int argc = *argcp, i;
 207
 208                         commit_pager_choice();
 209
 210                         /* build alias_argv */
 211                         alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
 212                         alias_argv[0] = alias_string + 1;
 213                         for (i = 1; i < argc; ++i)
 214                                 alias_argv[i] = (*argv)[i];
 215                         alias_argv[argc] = NULL;
 216
 217                         ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
 218                         if (ret >= 0)   /* normal exit */
 219                                 exit(ret);
 220
 221                         die_errno("While expanding alias '%s': '%s'",
 222                             alias_command, alias_string + 1);
 223                 }
 224                 count = split_cmdline(alias_string, &new_argv);
 225                 if (count < 0)
 226                         die("Bad alias.%s string: %s", alias_command,
 227                             split_cmdline_strerror(count));
 228                 option_count = handle_options(&new_argv, &count, &envchanged);
 229                 if (envchanged)
 230                         die("alias '%s' changes environment variables\n"
 231                                  "You can use '!git' in the alias to do this.",
 232                                  alias_command);
 233                 memmove(new_argv - option_count, new_argv,
 234                                 count * sizeof(char *));
 235                 new_argv -= option_count;
 236
 237                 if (count < 1)
 238                         die("empty alias for %s", alias_command);
 239
 240                 if (!strcmp(alias_command, new_argv[0]))
 241                         die("recursive alias: %s", alias_command);
 242
 243                 trace_argv_printf(new_argv,
 244                                   "trace: alias expansion: %s =>",
 245                                   alias_command);
 246
 247                 new_argv = xrealloc(new_argv, sizeof(char *) *
 248                                     (count + *argcp));
 249                 /* insert after command name */
 250                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 251
 252                 *argv = new_argv;
 253                 *argcp += count - 1;
 254
 255                 ret = 1;
 256         }
 257
 258         if (subdir && chdir(subdir))
 259                 die_errno("Cannot change to '%s'", subdir);
 260
 261         errno = saved_errno;
 262
 263         return ret;
 264 }
 265
 266 #define RUN_SETUP               (1<<0)
 267 #define RUN_SETUP_GENTLY        (1<<1)
 268 #define USE_PAGER               (1<<2)
 269 /*
 270  * require working tree to be present -- anything uses this needs
 271  * RUN_SETUP for reading from the configuration file.
 272  */
 273 #define NEED_WORK_TREE          (1<<3)
 274
 275 struct cmd_struct {
 276         const char *cmd;
 277         int (*fn)(int, const char **, const char *);
 278         int option;
 279 };
 280
 281 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 282 {
 283         int status, help;
 284         struct stat st;
 285         const char *prefix;
 286
 287         prefix = NULL;
 288         help = argc == 2 && !strcmp(argv[1], "-h");
 289         if (!help) {
 290                 if (p->option & RUN_SETUP)
 291                         prefix = setup_git_directory();
 292                 else if (p->option & RUN_SETUP_GENTLY) {
 293                         int nongit_ok;
 294                         prefix = setup_git_directory_gently(&nongit_ok);
 295                 }
 296
 297                 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 298                         use_pager = check_pager_config(p->cmd);
 299                 if (use_pager == -1 && p->option & USE_PAGER)
 300                         use_pager = 1;
 301
 302                 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
 303                     startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
 304                         trace_repo_setup(prefix);
 305         }
 306         commit_pager_choice();
 307
 308         if (!help && p->option & NEED_WORK_TREE)
 309                 setup_work_tree();
 310
 311         trace_argv_printf(argv, "trace: built-in: git");
 312
 313         status = p->fn(argc, argv, prefix);
 314         if (status)
 315                 return status;
 316
 317         /* Somebody closed stdout? */
 318         if (fstat(fileno(stdout), &st))
 319                 return 0;
 320         /* Ignore write errors for pipes and sockets.. */
 321         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 322                 return 0;
 323
 324         /* Check for ENOSPC and EIO errors.. */
 325         if (fflush(stdout))
 326                 die_errno("write failure on standard output");
 327         if (ferror(stdout))
 328                 die("unknown write failure on standard output");
 329         if (fclose(stdout))
 330                 die_errno("close failed on standard output");
 331         return 0;
 332 }
 333
 334 static struct cmd_struct commands[] = {
 335         { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 336         { "annotate", cmd_annotate, RUN_SETUP },
 337         { "apply", cmd_apply, RUN_SETUP_GENTLY },
 338         { "archive", cmd_archive },
 339         { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 340         { "blame", cmd_blame, RUN_SETUP },
 341         { "branch", cmd_branch, RUN_SETUP },
 342         { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 343         { "cat-file", cmd_cat_file, RUN_SETUP },
 344         { "check-attr", cmd_check_attr, RUN_SETUP },
 345         { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
 346         { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
 347         { "check-ref-format", cmd_check_ref_format },
 348         { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 349         { "checkout-index", cmd_checkout_index,
 350                 RUN_SETUP | NEED_WORK_TREE},
 351         { "cherry", cmd_cherry, RUN_SETUP },
 352         { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 353         { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 354         { "clone", cmd_clone },
 355         { "column", cmd_column, RUN_SETUP_GENTLY },
 356         { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 357         { "commit-tree", cmd_commit_tree, RUN_SETUP },
 358         { "config", cmd_config, RUN_SETUP_GENTLY },
 359         { "count-objects", cmd_count_objects, RUN_SETUP },
 360         { "credential", cmd_credential, RUN_SETUP_GENTLY },
 361         { "describe", cmd_describe, RUN_SETUP },
 362         { "diff", cmd_diff },
 363         { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 364         { "diff-index", cmd_diff_index, RUN_SETUP },
 365         { "diff-tree", cmd_diff_tree, RUN_SETUP },
 366         { "fast-export", cmd_fast_export, RUN_SETUP },
 367         { "fetch", cmd_fetch, RUN_SETUP },
 368         { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 369         { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 370         { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 371         { "format-patch", cmd_format_patch, RUN_SETUP },
 372         { "fsck", cmd_fsck, RUN_SETUP },
 373         { "fsck-objects", cmd_fsck, RUN_SETUP },
 374         { "gc", cmd_gc, RUN_SETUP },
 375         { "get-tar-commit-id", cmd_get_tar_commit_id },
 376         { "grep", cmd_grep, RUN_SETUP_GENTLY },
 377         { "hash-object", cmd_hash_object },
 378         { "help", cmd_help },
 379         { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
 380         { "init", cmd_init_db },
 381         { "init-db", cmd_init_db },
 382         { "log", cmd_log, RUN_SETUP },
 383         { "ls-files", cmd_ls_files, RUN_SETUP },
 384         { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 385         { "ls-tree", cmd_ls_tree, RUN_SETUP },
 386         { "mailinfo", cmd_mailinfo },
 387         { "mailsplit", cmd_mailsplit },
 388         { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 389         { "merge-base", cmd_merge_base, RUN_SETUP },
 390         { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 391         { "merge-index", cmd_merge_index, RUN_SETUP },
 392         { "merge-ours", cmd_merge_ours, RUN_SETUP },
 393         { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 394         { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 395         { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 396         { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 397         { "merge-tree", cmd_merge_tree, RUN_SETUP },
 398         { "mktag", cmd_mktag, RUN_SETUP },
 399         { "mktree", cmd_mktree, RUN_SETUP },
 400         { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 401         { "name-rev", cmd_name_rev, RUN_SETUP },
 402         { "notes", cmd_notes, RUN_SETUP },
 403         { "pack-objects", cmd_pack_objects, RUN_SETUP },
 404         { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 405         { "pack-refs", cmd_pack_refs, RUN_SETUP },
 406         { "patch-id", cmd_patch_id },
 407         { "pickaxe", cmd_blame, RUN_SETUP },
 408         { "prune", cmd_prune, RUN_SETUP },
 409         { "prune-packed", cmd_prune_packed, RUN_SETUP },
 410         { "push", cmd_push, RUN_SETUP },
 411         { "read-tree", cmd_read_tree, RUN_SETUP },
 412         { "receive-pack", cmd_receive_pack },
 413         { "reflog", cmd_reflog, RUN_SETUP },
 414         { "remote", cmd_remote, RUN_SETUP },
 415         { "remote-ext", cmd_remote_ext },
 416         { "remote-fd", cmd_remote_fd },
 417         { "repack", cmd_repack, RUN_SETUP },
 418         { "replace", cmd_replace, RUN_SETUP },
 419         { "rerere", cmd_rerere, RUN_SETUP },
 420         { "reset", cmd_reset, RUN_SETUP },
 421         { "rev-list", cmd_rev_list, RUN_SETUP },
 422         { "rev-parse", cmd_rev_parse },
 423         { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 424         { "rm", cmd_rm, RUN_SETUP },
 425         { "send-pack", cmd_send_pack, RUN_SETUP },
 426         { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 427         { "show", cmd_show, RUN_SETUP },
 428         { "show-branch", cmd_show_branch, RUN_SETUP },
 429         { "show-ref", cmd_show_ref, RUN_SETUP },
 430         { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 431         { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 432         { "stripspace", cmd_stripspace },
 433         { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 434         { "tag", cmd_tag, RUN_SETUP },
 435         { "unpack-file", cmd_unpack_file, RUN_SETUP },
 436         { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 437         { "update-index", cmd_update_index, RUN_SETUP },
 438         { "update-ref", cmd_update_ref, RUN_SETUP },
 439         { "update-server-info", cmd_update_server_info, RUN_SETUP },
 440         { "upload-archive", cmd_upload_archive },
 441         { "upload-archive--writer", cmd_upload_archive_writer },
 442         { "var", cmd_var, RUN_SETUP_GENTLY },
 443         { "verify-pack", cmd_verify_pack },
 444         { "verify-tag", cmd_verify_tag, RUN_SETUP },
 445         { "version", cmd_version },
 446         { "whatchanged", cmd_whatchanged, RUN_SETUP },
 447         { "write-tree", cmd_write_tree, RUN_SETUP },
 448 };
 449
 450 int is_builtin(const char *s)
 451 {
 452         int i;
 453         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 454                 struct cmd_struct *p = commands+i;
 455                 if (!strcmp(s, p->cmd))
 456                         return 1;
 457         }
 458         return 0;
 459 }
 460
 461 static void handle_builtin(int argc, const char **argv)
 462 {
 463         const char *cmd = argv[0];
 464         int i;
 465         static const char ext[] = STRIP_EXTENSION;
 466
 467         if (sizeof(ext) > 1) {
 468                 i = strlen(argv[0]) - strlen(ext);
 469                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 470                         char *argv0 = xstrdup(argv[0]);
 471                         argv[0] = cmd = argv0;
 472                         argv0[i] = '\0';
 473                 }
 474         }
 475
 476         /* Turn "git cmd --help" into "git help cmd" */
 477         if (argc > 1 && !strcmp(argv[1], "--help")) {
 478                 argv[1] = argv[0];
 479                 argv[0] = cmd = "help";
 480         }
 481
 482         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 483                 struct cmd_struct *p = commands+i;
 484                 if (strcmp(p->cmd, cmd))
 485                         continue;
 486                 exit(run_builtin(p, argc, argv));
 487         }
 488 }
 489
 490 static void execv_dashed_external(const char **argv)
 491 {
 492         struct strbuf cmd = STRBUF_INIT;
 493         const char *tmp;
 494         int status;
 495
 496         if (use_pager == -1)
 497                 use_pager = check_pager_config(argv[0]);
 498         commit_pager_choice();
 499
 500         strbuf_addf(&cmd, "git-%s", argv[0]);
 501
 502         /*
 503          * argv[0] must be the git command, but the argv array
 504          * belongs to the caller, and may be reused in
 505          * subsequent loop iterations. Save argv[0] and
 506          * restore it on error.
 507          */
 508         tmp = argv[0];
 509         argv[0] = cmd.buf;
 510
 511         trace_argv_printf(argv, "trace: exec:");
 512
 513         /*
 514          * if we fail because the command is not found, it is
 515          * OK to return. Otherwise, we just pass along the status code.
 516          */
 517         status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
 518         if (status >= 0 || errno != ENOENT)
 519                 exit(status);
 520
 521         argv[0] = tmp;
 522
 523         strbuf_release(&cmd);
 524 }
 525
 526 static int run_argv(int *argcp, const char ***argv)
 527 {
 528         int done_alias = 0;
 529
 530         while (1) {
 531                 /* See if it's a builtin */
 532                 handle_builtin(*argcp, *argv);
 533
 534                 /* .. then try the external ones */
 535                 execv_dashed_external(*argv);
 536
 537                 /* It could be an alias -- this works around the insanity
 538                  * of overriding "git log" with "git show" by having
 539                  * alias.log = show
 540                  */
 541                 if (done_alias || !handle_alias(argcp, argv))
 542                         break;
 543                 done_alias = 1;
 544         }
 545
 546         return done_alias;
 547 }
 548
 549
 550 int main(int argc, char **av)
 551 {
 552         const char **argv = (const char **) av;
 553         const char *cmd;
 554
 555         startup_info = &git_startup_info;
 556
 557         cmd = git_extract_argv0_path(argv[0]);
 558         if (!cmd)
 559                 cmd = "git-help";
 560
 561         /*
 562          * Always open file descriptors 0/1/2 to avoid clobbering files
 563          * in die().  It also avoids messing up when the pipes are dup'ed
 564          * onto stdin/stdout/stderr in the child processes we spawn.
 565          */
 566         sanitize_stdfds();
 567
 568         git_setup_gettext();
 569
 570         /*
 571          * "git-xxxx" is the same as "git xxxx", but we obviously:
 572          *
 573          *  - cannot take flags in between the "git" and the "xxxx".
 574          *  - cannot execute it externally (since it would just do
 575          *    the same thing over again)
 576          *
 577          * So we just directly call the builtin handler, and die if
 578          * that one cannot handle it.
 579          */
 580         if (skip_prefix(cmd, "git-", &cmd)) {
 581                 argv[0] = cmd;
 582                 handle_builtin(argc, argv);
 583                 die("cannot handle %s as a builtin", cmd);
 584         }
 585
 586         /* Look for flags.. */
 587         argv++;
 588         argc--;
 589         handle_options(&argv, &argc, NULL);
 590         if (argc > 0) {
 591                 /* translate --help and --version into commands */
 592                 skip_prefix(argv[0], "--", &argv[0]);
 593         } else {
 594                 /* The user didn't specify a command; give them help */
 595                 commit_pager_choice();
 596                 printf("usage: %s\n\n", git_usage_string);
 597                 list_common_cmds_help();
 598                 printf("\n%s\n", _(git_more_info_string));
 599                 exit(1);
 600         }
 601         cmd = argv[0];
 602
 603         /*
 604          * We use PATH to find git commands, but we prepend some higher
 605          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 606          * environment, and the $(gitexecdir) from the Makefile at build
 607          * time.
 608          */
 609         setup_path();
 610
 611         while (1) {
 612                 static int done_help = 0;
 613                 static int was_alias = 0;
 614                 was_alias = run_argv(&argc, &argv);
 615                 if (errno != ENOENT)
 616                         break;
 617                 if (was_alias) {
 618                         fprintf(stderr, "Expansion of alias '%s' failed; "
 619                                 "'%s' is not a git command\n",
 620                                 cmd, argv[0]);
 621                         exit(1);
 622                 }
 623                 if (!done_help) {
 624                         cmd = argv[0] = help_unknown_cmd(cmd);
 625                         done_help = 1;
 626                 } else
 627                         break;
 628         }
 629
 630         fprintf(stderr, "Failed to run command '%s': %s\n",
 631                 cmd, strerror(errno));
 632
 633         return 1;
 634 }