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