Merge branch 'rs/nth-switch-code-simplification'
[git/git.git] / git.c
1 #include "builtin.h"
2 #include "config.h"
3 #include "exec-cmd.h"
4 #include "help.h"
5 #include "run-command.h"
6 #include "alias.h"
7
8 #define RUN_SETUP (1<<0)
9 #define RUN_SETUP_GENTLY (1<<1)
10 #define USE_PAGER (1<<2)
11 /*
12 * require working tree to be present -- anything uses this needs
13 * RUN_SETUP for reading from the configuration file.
14 */
15 #define NEED_WORK_TREE (1<<3)
16 #define SUPPORT_SUPER_PREFIX (1<<4)
17 #define DELAY_PAGER_CONFIG (1<<5)
18 #define NO_PARSEOPT (1<<6) /* parse-options is not used */
19
20 struct cmd_struct {
21 const char *cmd;
22 int (*fn)(int, const char **, const char *);
23 unsigned int option;
24 };
25
26 const char git_usage_string[] =
27 N_("git [--version] [--help] [-C <path>] [-c <name>=<value>]\n"
28 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
29 " [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--bare]\n"
30 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
31 " <command> [<args>]");
32
33 const char git_more_info_string[] =
34 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
35 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
36 "to read about a specific subcommand or concept.\n"
37 "See 'git help git' for an overview of the system.");
38
39 static int use_pager = -1;
40
41 static void list_builtins(struct string_list *list, unsigned int exclude_option);
42
43 static void exclude_helpers_from_list(struct string_list *list)
44 {
45 int i = 0;
46
47 while (i < list->nr) {
48 if (strstr(list->items[i].string, "--"))
49 unsorted_string_list_delete_item(list, i, 0);
50 else
51 i++;
52 }
53 }
54
55 static int match_token(const char *spec, int len, const char *token)
56 {
57 int token_len = strlen(token);
58
59 return len == token_len && !strncmp(spec, token, token_len);
60 }
61
62 static int list_cmds(const char *spec)
63 {
64 struct string_list list = STRING_LIST_INIT_DUP;
65 int i;
66 int nongit;
67
68 /*
69 * Set up the repository so we can pick up any repo-level config (like
70 * completion.commands).
71 */
72 setup_git_directory_gently(&nongit);
73
74 while (*spec) {
75 const char *sep = strchrnul(spec, ',');
76 int len = sep - spec;
77
78 if (match_token(spec, len, "builtins"))
79 list_builtins(&list, 0);
80 else if (match_token(spec, len, "main"))
81 list_all_main_cmds(&list);
82 else if (match_token(spec, len, "others"))
83 list_all_other_cmds(&list);
84 else if (match_token(spec, len, "nohelpers"))
85 exclude_helpers_from_list(&list);
86 else if (match_token(spec, len, "alias"))
87 list_aliases(&list);
88 else if (match_token(spec, len, "config"))
89 list_cmds_by_config(&list);
90 else if (len > 5 && !strncmp(spec, "list-", 5)) {
91 struct strbuf sb = STRBUF_INIT;
92
93 strbuf_add(&sb, spec + 5, len - 5);
94 list_cmds_by_category(&list, sb.buf);
95 strbuf_release(&sb);
96 }
97 else
98 die(_("unsupported command listing type '%s'"), spec);
99 spec += len;
100 if (*spec == ',')
101 spec++;
102 }
103 for (i = 0; i < list.nr; i++)
104 puts(list.items[i].string);
105 string_list_clear(&list, 0);
106 return 0;
107 }
108
109 static void commit_pager_choice(void)
110 {
111 switch (use_pager) {
112 case 0:
113 setenv("GIT_PAGER", "cat", 1);
114 break;
115 case 1:
116 setup_pager();
117 break;
118 default:
119 break;
120 }
121 }
122
123 void setup_auto_pager(const char *cmd, int def)
124 {
125 if (use_pager != -1 || pager_in_use())
126 return;
127 use_pager = check_pager_config(cmd);
128 if (use_pager == -1)
129 use_pager = def;
130 commit_pager_choice();
131 }
132
133 static int handle_options(const char ***argv, int *argc, int *envchanged)
134 {
135 const char **orig_argv = *argv;
136
137 while (*argc > 0) {
138 const char *cmd = (*argv)[0];
139 if (cmd[0] != '-')
140 break;
141
142 /*
143 * For legacy reasons, the "version" and "help"
144 * commands can be written with "--" prepended
145 * to make them look like flags.
146 */
147 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
148 break;
149
150 /*
151 * Check remaining flags.
152 */
153 if (skip_prefix(cmd, "--exec-path", &cmd)) {
154 if (*cmd == '=')
155 git_set_exec_path(cmd + 1);
156 else {
157 puts(git_exec_path());
158 trace2_cmd_name("_query_");
159 exit(0);
160 }
161 } else if (!strcmp(cmd, "--html-path")) {
162 puts(system_path(GIT_HTML_PATH));
163 trace2_cmd_name("_query_");
164 exit(0);
165 } else if (!strcmp(cmd, "--man-path")) {
166 puts(system_path(GIT_MAN_PATH));
167 trace2_cmd_name("_query_");
168 exit(0);
169 } else if (!strcmp(cmd, "--info-path")) {
170 puts(system_path(GIT_INFO_PATH));
171 trace2_cmd_name("_query_");
172 exit(0);
173 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
174 use_pager = 1;
175 } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) {
176 use_pager = 0;
177 if (envchanged)
178 *envchanged = 1;
179 } else if (!strcmp(cmd, "--no-replace-objects")) {
180 read_replace_refs = 0;
181 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
182 if (envchanged)
183 *envchanged = 1;
184 } else if (!strcmp(cmd, "--git-dir")) {
185 if (*argc < 2) {
186 fprintf(stderr, _("no directory given for --git-dir\n" ));
187 usage(git_usage_string);
188 }
189 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
190 if (envchanged)
191 *envchanged = 1;
192 (*argv)++;
193 (*argc)--;
194 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
195 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
196 if (envchanged)
197 *envchanged = 1;
198 } else if (!strcmp(cmd, "--namespace")) {
199 if (*argc < 2) {
200 fprintf(stderr, _("no namespace given for --namespace\n" ));
201 usage(git_usage_string);
202 }
203 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
204 if (envchanged)
205 *envchanged = 1;
206 (*argv)++;
207 (*argc)--;
208 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
209 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
210 if (envchanged)
211 *envchanged = 1;
212 } else if (!strcmp(cmd, "--work-tree")) {
213 if (*argc < 2) {
214 fprintf(stderr, _("no directory given for --work-tree\n" ));
215 usage(git_usage_string);
216 }
217 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
218 if (envchanged)
219 *envchanged = 1;
220 (*argv)++;
221 (*argc)--;
222 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
223 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
224 if (envchanged)
225 *envchanged = 1;
226 } else if (!strcmp(cmd, "--super-prefix")) {
227 if (*argc < 2) {
228 fprintf(stderr, _("no prefix given for --super-prefix\n" ));
229 usage(git_usage_string);
230 }
231 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
232 if (envchanged)
233 *envchanged = 1;
234 (*argv)++;
235 (*argc)--;
236 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
237 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
238 if (envchanged)
239 *envchanged = 1;
240 } else if (!strcmp(cmd, "--bare")) {
241 char *cwd = xgetcwd();
242 is_bare_repository_cfg = 1;
243 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
244 free(cwd);
245 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
246 if (envchanged)
247 *envchanged = 1;
248 } else if (!strcmp(cmd, "-c")) {
249 if (*argc < 2) {
250 fprintf(stderr, _("-c expects a configuration string\n" ));
251 usage(git_usage_string);
252 }
253 git_config_push_parameter((*argv)[1]);
254 (*argv)++;
255 (*argc)--;
256 } else if (!strcmp(cmd, "--literal-pathspecs")) {
257 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
258 if (envchanged)
259 *envchanged = 1;
260 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
261 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
262 if (envchanged)
263 *envchanged = 1;
264 } else if (!strcmp(cmd, "--glob-pathspecs")) {
265 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
266 if (envchanged)
267 *envchanged = 1;
268 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
269 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
270 if (envchanged)
271 *envchanged = 1;
272 } else if (!strcmp(cmd, "--icase-pathspecs")) {
273 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
274 if (envchanged)
275 *envchanged = 1;
276 } else if (!strcmp(cmd, "--no-optional-locks")) {
277 setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
278 if (envchanged)
279 *envchanged = 1;
280 } else if (!strcmp(cmd, "--shallow-file")) {
281 (*argv)++;
282 (*argc)--;
283 set_alternate_shallow_file(the_repository, (*argv)[0], 1);
284 if (envchanged)
285 *envchanged = 1;
286 } else if (!strcmp(cmd, "-C")) {
287 if (*argc < 2) {
288 fprintf(stderr, _("no directory given for -C\n" ));
289 usage(git_usage_string);
290 }
291 if ((*argv)[1][0]) {
292 if (chdir((*argv)[1]))
293 die_errno("cannot change to '%s'", (*argv)[1]);
294 if (envchanged)
295 *envchanged = 1;
296 }
297 (*argv)++;
298 (*argc)--;
299 } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
300 trace2_cmd_name("_query_");
301 if (!strcmp(cmd, "parseopt")) {
302 struct string_list list = STRING_LIST_INIT_DUP;
303 int i;
304
305 list_builtins(&list, NO_PARSEOPT);
306 for (i = 0; i < list.nr; i++)
307 printf("%s ", list.items[i].string);
308 string_list_clear(&list, 0);
309 exit(0);
310 } else {
311 exit(list_cmds(cmd));
312 }
313 } else {
314 fprintf(stderr, _("unknown option: %s\n"), cmd);
315 usage(git_usage_string);
316 }
317
318 (*argv)++;
319 (*argc)--;
320 }
321 return (*argv) - orig_argv;
322 }
323
324 static int handle_alias(int *argcp, const char ***argv)
325 {
326 int envchanged = 0, ret = 0, saved_errno = errno;
327 int count, option_count;
328 const char **new_argv;
329 const char *alias_command;
330 char *alias_string;
331
332 alias_command = (*argv)[0];
333 alias_string = alias_lookup(alias_command);
334 if (alias_string) {
335 if (*argcp > 1 && !strcmp((*argv)[1], "-h"))
336 fprintf_ln(stderr, _("'%s' is aliased to '%s'"),
337 alias_command, alias_string);
338 if (alias_string[0] == '!') {
339 struct child_process child = CHILD_PROCESS_INIT;
340 int nongit_ok;
341
342 /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
343 setup_git_directory_gently(&nongit_ok);
344
345 commit_pager_choice();
346
347 child.use_shell = 1;
348 child.trace2_child_class = "shell_alias";
349 argv_array_push(&child.args, alias_string + 1);
350 argv_array_pushv(&child.args, (*argv) + 1);
351
352 trace2_cmd_alias(alias_command, child.args.argv);
353 trace2_cmd_list_config();
354 trace2_cmd_name("_run_shell_alias_");
355
356 ret = run_command(&child);
357 if (ret >= 0) /* normal exit */
358 exit(ret);
359
360 die_errno(_("while expanding alias '%s': '%s'"),
361 alias_command, alias_string + 1);
362 }
363 count = split_cmdline(alias_string, &new_argv);
364 if (count < 0)
365 die(_("bad alias.%s string: %s"), alias_command,
366 _(split_cmdline_strerror(count)));
367 option_count = handle_options(&new_argv, &count, &envchanged);
368 if (envchanged)
369 die(_("alias '%s' changes environment variables.\n"
370 "You can use '!git' in the alias to do this"),
371 alias_command);
372 memmove(new_argv - option_count, new_argv,
373 count * sizeof(char *));
374 new_argv -= option_count;
375
376 if (count < 1)
377 die(_("empty alias for %s"), alias_command);
378
379 if (!strcmp(alias_command, new_argv[0]))
380 die(_("recursive alias: %s"), alias_command);
381
382 trace_argv_printf(new_argv,
383 "trace: alias expansion: %s =>",
384 alias_command);
385
386 REALLOC_ARRAY(new_argv, count + *argcp);
387 /* insert after command name */
388 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
389
390 trace2_cmd_alias(alias_command, new_argv);
391 trace2_cmd_list_config();
392
393 *argv = new_argv;
394 *argcp += count - 1;
395
396 ret = 1;
397 }
398
399 errno = saved_errno;
400
401 return ret;
402 }
403
404 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
405 {
406 int status, help;
407 struct stat st;
408 const char *prefix;
409
410 prefix = NULL;
411 help = argc == 2 && !strcmp(argv[1], "-h");
412 if (!help) {
413 if (p->option & RUN_SETUP)
414 prefix = setup_git_directory();
415 else if (p->option & RUN_SETUP_GENTLY) {
416 int nongit_ok;
417 prefix = setup_git_directory_gently(&nongit_ok);
418 }
419
420 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
421 !(p->option & DELAY_PAGER_CONFIG))
422 use_pager = check_pager_config(p->cmd);
423 if (use_pager == -1 && p->option & USE_PAGER)
424 use_pager = 1;
425
426 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
427 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
428 trace_repo_setup(prefix);
429 }
430 commit_pager_choice();
431
432 if (!help && get_super_prefix()) {
433 if (!(p->option & SUPPORT_SUPER_PREFIX))
434 die(_("%s doesn't support --super-prefix"), p->cmd);
435 }
436
437 if (!help && p->option & NEED_WORK_TREE)
438 setup_work_tree();
439
440 trace_argv_printf(argv, "trace: built-in: git");
441 trace2_cmd_name(p->cmd);
442 trace2_cmd_list_config();
443
444 validate_cache_entries(the_repository->index);
445 status = p->fn(argc, argv, prefix);
446 validate_cache_entries(the_repository->index);
447
448 if (status)
449 return status;
450
451 /* Somebody closed stdout? */
452 if (fstat(fileno(stdout), &st))
453 return 0;
454 /* Ignore write errors for pipes and sockets.. */
455 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
456 return 0;
457
458 /* Check for ENOSPC and EIO errors.. */
459 if (fflush(stdout))
460 die_errno(_("write failure on standard output"));
461 if (ferror(stdout))
462 die(_("unknown write failure on standard output"));
463 if (fclose(stdout))
464 die_errno(_("close failed on standard output"));
465 return 0;
466 }
467
468 static struct cmd_struct commands[] = {
469 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
470 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
471 { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
472 { "apply", cmd_apply, RUN_SETUP_GENTLY },
473 { "archive", cmd_archive, RUN_SETUP_GENTLY },
474 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
475 { "blame", cmd_blame, RUN_SETUP },
476 { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
477 { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT },
478 { "cat-file", cmd_cat_file, RUN_SETUP },
479 { "check-attr", cmd_check_attr, RUN_SETUP },
480 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
481 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
482 { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT },
483 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
484 { "checkout-index", cmd_checkout_index,
485 RUN_SETUP | NEED_WORK_TREE},
486 { "cherry", cmd_cherry, RUN_SETUP },
487 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
488 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
489 { "clone", cmd_clone },
490 { "column", cmd_column, RUN_SETUP_GENTLY },
491 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
492 { "commit-graph", cmd_commit_graph, RUN_SETUP },
493 { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT },
494 { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
495 { "count-objects", cmd_count_objects, RUN_SETUP },
496 { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
497 { "describe", cmd_describe, RUN_SETUP },
498 { "diff", cmd_diff, NO_PARSEOPT },
499 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
500 { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
501 { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
502 { "difftool", cmd_difftool, RUN_SETUP_GENTLY },
503 { "env--helper", cmd_env__helper },
504 { "fast-export", cmd_fast_export, RUN_SETUP },
505 { "fetch", cmd_fetch, RUN_SETUP },
506 { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
507 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
508 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
509 { "format-patch", cmd_format_patch, RUN_SETUP },
510 { "fsck", cmd_fsck, RUN_SETUP },
511 { "fsck-objects", cmd_fsck, RUN_SETUP },
512 { "gc", cmd_gc, RUN_SETUP },
513 { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
514 { "grep", cmd_grep, RUN_SETUP_GENTLY },
515 { "hash-object", cmd_hash_object },
516 { "help", cmd_help },
517 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
518 { "init", cmd_init_db },
519 { "init-db", cmd_init_db },
520 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
521 { "log", cmd_log, RUN_SETUP },
522 { "ls-files", cmd_ls_files, RUN_SETUP },
523 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
524 { "ls-tree", cmd_ls_tree, RUN_SETUP },
525 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
526 { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
527 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
528 { "merge-base", cmd_merge_base, RUN_SETUP },
529 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
530 { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
531 { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
532 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
533 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
534 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
535 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
536 { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
537 { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
538 { "mktree", cmd_mktree, RUN_SETUP },
539 { "multi-pack-index", cmd_multi_pack_index, RUN_SETUP_GENTLY },
540 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
541 { "name-rev", cmd_name_rev, RUN_SETUP },
542 { "notes", cmd_notes, RUN_SETUP },
543 { "pack-objects", cmd_pack_objects, RUN_SETUP },
544 { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
545 { "pack-refs", cmd_pack_refs, RUN_SETUP },
546 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
547 { "pickaxe", cmd_blame, RUN_SETUP },
548 { "prune", cmd_prune, RUN_SETUP },
549 { "prune-packed", cmd_prune_packed, RUN_SETUP },
550 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
551 { "push", cmd_push, RUN_SETUP },
552 { "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER },
553 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
554 { "rebase", cmd_rebase, RUN_SETUP | NEED_WORK_TREE },
555 { "rebase--interactive", cmd_rebase__interactive, RUN_SETUP | NEED_WORK_TREE },
556 { "receive-pack", cmd_receive_pack },
557 { "reflog", cmd_reflog, RUN_SETUP },
558 { "remote", cmd_remote, RUN_SETUP },
559 { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
560 { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
561 { "repack", cmd_repack, RUN_SETUP },
562 { "replace", cmd_replace, RUN_SETUP },
563 { "rerere", cmd_rerere, RUN_SETUP },
564 { "reset", cmd_reset, RUN_SETUP },
565 { "restore", cmd_restore, RUN_SETUP | NEED_WORK_TREE },
566 { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
567 { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
568 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
569 { "rm", cmd_rm, RUN_SETUP },
570 { "send-pack", cmd_send_pack, RUN_SETUP },
571 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
572 { "show", cmd_show, RUN_SETUP },
573 { "show-branch", cmd_show_branch, RUN_SETUP },
574 { "show-index", cmd_show_index },
575 { "show-ref", cmd_show_ref, RUN_SETUP },
576 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
577 /*
578 * NEEDSWORK: Until the builtin stash is thoroughly robust and no
579 * longer needs redirection to the stash shell script this is kept as
580 * is, then should be changed to RUN_SETUP | NEED_WORK_TREE
581 */
582 { "stash", cmd_stash },
583 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
584 { "stripspace", cmd_stripspace },
585 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
586 { "switch", cmd_switch, RUN_SETUP | NEED_WORK_TREE },
587 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
588 { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
589 { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
590 { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
591 { "update-index", cmd_update_index, RUN_SETUP },
592 { "update-ref", cmd_update_ref, RUN_SETUP },
593 { "update-server-info", cmd_update_server_info, RUN_SETUP },
594 { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
595 { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
596 { "upload-pack", cmd_upload_pack },
597 { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
598 { "verify-commit", cmd_verify_commit, RUN_SETUP },
599 { "verify-pack", cmd_verify_pack },
600 { "verify-tag", cmd_verify_tag, RUN_SETUP },
601 { "version", cmd_version },
602 { "whatchanged", cmd_whatchanged, RUN_SETUP },
603 { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT },
604 { "write-tree", cmd_write_tree, RUN_SETUP },
605 };
606
607 static struct cmd_struct *get_builtin(const char *s)
608 {
609 int i;
610 for (i = 0; i < ARRAY_SIZE(commands); i++) {
611 struct cmd_struct *p = commands + i;
612 if (!strcmp(s, p->cmd))
613 return p;
614 }
615 return NULL;
616 }
617
618 int is_builtin(const char *s)
619 {
620 return !!get_builtin(s);
621 }
622
623 static void list_builtins(struct string_list *out, unsigned int exclude_option)
624 {
625 int i;
626 for (i = 0; i < ARRAY_SIZE(commands); i++) {
627 if (exclude_option &&
628 (commands[i].option & exclude_option))
629 continue;
630 string_list_append(out, commands[i].cmd);
631 }
632 }
633
634 #ifdef STRIP_EXTENSION
635 static void strip_extension(const char **argv)
636 {
637 size_t len;
638
639 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
640 argv[0] = xmemdupz(argv[0], len);
641 }
642 #else
643 #define strip_extension(cmd)
644 #endif
645
646 static void handle_builtin(int argc, const char **argv)
647 {
648 struct argv_array args = ARGV_ARRAY_INIT;
649 const char *cmd;
650 struct cmd_struct *builtin;
651
652 strip_extension(argv);
653 cmd = argv[0];
654
655 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
656 if (argc > 1 && !strcmp(argv[1], "--help")) {
657 int i;
658
659 argv[1] = argv[0];
660 argv[0] = cmd = "help";
661
662 for (i = 0; i < argc; i++) {
663 argv_array_push(&args, argv[i]);
664 if (!i)
665 argv_array_push(&args, "--exclude-guides");
666 }
667
668 argc++;
669 argv = args.argv;
670 }
671
672 builtin = get_builtin(cmd);
673 if (builtin)
674 exit(run_builtin(builtin, argc, argv));
675 argv_array_clear(&args);
676 }
677
678 static void execv_dashed_external(const char **argv)
679 {
680 struct child_process cmd = CHILD_PROCESS_INIT;
681 int status;
682
683 if (get_super_prefix())
684 die(_("%s doesn't support --super-prefix"), argv[0]);
685
686 if (use_pager == -1 && !is_builtin(argv[0]))
687 use_pager = check_pager_config(argv[0]);
688 commit_pager_choice();
689
690 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
691 argv_array_pushv(&cmd.args, argv + 1);
692 cmd.clean_on_exit = 1;
693 cmd.wait_after_clean = 1;
694 cmd.silent_exec_failure = 1;
695 cmd.trace2_child_class = "dashed";
696
697 trace2_cmd_name("_run_dashed_");
698
699 /*
700 * The code in run_command() logs trace2 child_start/child_exit
701 * events, so we do not need to report exec/exec_result events here.
702 */
703 trace_argv_printf(cmd.args.argv, "trace: exec:");
704
705 /*
706 * If we fail because the command is not found, it is
707 * OK to return. Otherwise, we just pass along the status code,
708 * or our usual generic code if we were not even able to exec
709 * the program.
710 */
711 status = run_command(&cmd);
712
713 /*
714 * If the child process ran and we are now going to exit, emit a
715 * generic string as our trace2 command verb to indicate that we
716 * launched a dashed command.
717 */
718 if (status >= 0)
719 exit(status);
720 else if (errno != ENOENT)
721 exit(128);
722 }
723
724 static int run_argv(int *argcp, const char ***argv)
725 {
726 int done_alias = 0;
727 struct string_list cmd_list = STRING_LIST_INIT_NODUP;
728 struct string_list_item *seen;
729
730 while (1) {
731 /*
732 * If we tried alias and futzed with our environment,
733 * it no longer is safe to invoke builtins directly in
734 * general. We have to spawn them as dashed externals.
735 *
736 * NEEDSWORK: if we can figure out cases
737 * where it is safe to do, we can avoid spawning a new
738 * process.
739 */
740 if (!done_alias)
741 handle_builtin(*argcp, *argv);
742 else if (get_builtin(**argv)) {
743 struct argv_array args = ARGV_ARRAY_INIT;
744 int i;
745
746 /*
747 * The current process is committed to launching a
748 * child process to run the command named in (**argv)
749 * and exiting. Log a generic string as the trace2
750 * command verb to indicate this. Note that the child
751 * process will log the actual verb when it runs.
752 */
753 trace2_cmd_name("_run_git_alias_");
754
755 if (get_super_prefix())
756 die("%s doesn't support --super-prefix", **argv);
757
758 commit_pager_choice();
759
760 argv_array_push(&args, "git");
761 for (i = 0; i < *argcp; i++)
762 argv_array_push(&args, (*argv)[i]);
763
764 trace_argv_printf(args.argv, "trace: exec:");
765
766 /*
767 * if we fail because the command is not found, it is
768 * OK to return. Otherwise, we just pass along the status code.
769 */
770 i = run_command_v_opt_tr2(args.argv, RUN_SILENT_EXEC_FAILURE |
771 RUN_CLEAN_ON_EXIT, "git_alias");
772 if (i >= 0 || errno != ENOENT)
773 exit(i);
774 die("could not execute builtin %s", **argv);
775 }
776
777 /* .. then try the external ones */
778 execv_dashed_external(*argv);
779
780 seen = unsorted_string_list_lookup(&cmd_list, *argv[0]);
781 if (seen) {
782 int i;
783 struct strbuf sb = STRBUF_INIT;
784 for (i = 0; i < cmd_list.nr; i++) {
785 struct string_list_item *item = &cmd_list.items[i];
786
787 strbuf_addf(&sb, "\n %s", item->string);
788 if (item == seen)
789 strbuf_addstr(&sb, " <==");
790 else if (i == cmd_list.nr - 1)
791 strbuf_addstr(&sb, " ==>");
792 }
793 die(_("alias loop detected: expansion of '%s' does"
794 " not terminate:%s"), cmd_list.items[0].string, sb.buf);
795 }
796
797 string_list_append(&cmd_list, *argv[0]);
798
799 /*
800 * It could be an alias -- this works around the insanity
801 * of overriding "git log" with "git show" by having
802 * alias.log = show
803 */
804 if (!handle_alias(argcp, argv))
805 break;
806 done_alias = 1;
807 }
808
809 string_list_clear(&cmd_list, 0);
810
811 return done_alias;
812 }
813
814 int cmd_main(int argc, const char **argv)
815 {
816 const char *cmd;
817 int done_help = 0;
818
819 cmd = argv[0];
820 if (!cmd)
821 cmd = "git-help";
822 else {
823 const char *slash = find_last_dir_sep(cmd);
824 if (slash)
825 cmd = slash + 1;
826 }
827
828 trace_command_performance(argv);
829
830 /*
831 * "git-xxxx" is the same as "git xxxx", but we obviously:
832 *
833 * - cannot take flags in between the "git" and the "xxxx".
834 * - cannot execute it externally (since it would just do
835 * the same thing over again)
836 *
837 * So we just directly call the builtin handler, and die if
838 * that one cannot handle it.
839 */
840 if (skip_prefix(cmd, "git-", &cmd)) {
841 argv[0] = cmd;
842 handle_builtin(argc, argv);
843 die(_("cannot handle %s as a builtin"), cmd);
844 }
845
846 /* Look for flags.. */
847 argv++;
848 argc--;
849 handle_options(&argv, &argc, NULL);
850 if (argc > 0) {
851 /* translate --help and --version into commands */
852 skip_prefix(argv[0], "--", &argv[0]);
853 } else {
854 /* The user didn't specify a command; give them help */
855 commit_pager_choice();
856 printf(_("usage: %s\n\n"), git_usage_string);
857 list_common_cmds_help();
858 printf("\n%s\n", _(git_more_info_string));
859 exit(1);
860 }
861 cmd = argv[0];
862
863 /*
864 * We use PATH to find git commands, but we prepend some higher
865 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
866 * environment, and the $(gitexecdir) from the Makefile at build
867 * time.
868 */
869 setup_path();
870
871 while (1) {
872 int was_alias = run_argv(&argc, &argv);
873 if (errno != ENOENT)
874 break;
875 if (was_alias) {
876 fprintf(stderr, _("expansion of alias '%s' failed; "
877 "'%s' is not a git command\n"),
878 cmd, argv[0]);
879 exit(1);
880 }
881 if (!done_help) {
882 cmd = argv[0] = help_unknown_cmd(cmd);
883 done_help = 1;
884 } else
885 break;
886 }
887
888 fprintf(stderr, _("failed to run command '%s': %s\n"),
889 cmd, strerror(errno));
890
891 return 1;
892 }