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