f6ae79ffaf7266326bb90bce154bfd9761364c75
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#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 */
19struct cmd_struct {
21 const char *cmd;
22 int (*fn)(int, const char **, const char *);
23 unsigned int option;
24};
25const 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 | --no-pager] [--no-replace-objects] [--bare]\n"
30 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
31 " <command> [<args>]");
32const 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.");
37static int use_pager = -1;
39static void list_builtins(struct string_list *list, unsigned int exclude_option);
41static void exclude_helpers_from_list(struct string_list *list)
43{
44 int i = 0;
45 while (i < list->nr) {
47 if (strstr(list->items[i].string, "--"))
48 unsorted_string_list_delete_item(list, i, 0);
49 else
50 i++;
51 }
52}
53static int match_token(const char *spec, int len, const char *token)
55{
56 int token_len = strlen(token);
57 return len == token_len && !strncmp(spec, token, token_len);
59}
60static int list_cmds(const char *spec)
62{
63 struct string_list list = STRING_LIST_INIT_DUP;
64 int i;
65 while (*spec) {
67 const char *sep = strchrnul(spec, ',');
68 int len = sep - spec;
69 if (match_token(spec, len, "builtins"))
71 list_builtins(&list, 0);
72 else if (match_token(spec, len, "main"))
73 list_all_main_cmds(&list);
74 else if (match_token(spec, len, "others"))
75 list_all_other_cmds(&list);
76 else if (match_token(spec, len, "nohelpers"))
77 exclude_helpers_from_list(&list);
78 else if (len > 5 && !strncmp(spec, "list-", 5)) {
79 struct strbuf sb = STRBUF_INIT;
80 strbuf_add(&sb, spec + 5, len - 5);
82 list_cmds_by_category(&list, sb.buf);
83 strbuf_release(&sb);
84 }
85 else
86 die(_("unsupported command listing type '%s'"), spec);
87 spec += len;
88 if (*spec == ',')
89 spec++;
90 }
91 for (i = 0; i < list.nr; i++)
92 puts(list.items[i].string);
93 string_list_clear(&list, 0);
94 return 0;
95}
96static void commit_pager_choice(void) {
98 switch (use_pager) {
99 case 0:
100 setenv("GIT_PAGER", "cat", 1);
101 break;
102 case 1:
103 setup_pager();
104 break;
105 default:
106 break;
107 }
108}
109void setup_auto_pager(const char *cmd, int def)
111{
112 if (use_pager != -1 || pager_in_use())
113 return;
114 use_pager = check_pager_config(cmd);
115 if (use_pager == -1)
116 use_pager = def;
117 commit_pager_choice();
118}
119static int handle_options(const char ***argv, int *argc, int *envchanged)
121{
122 const char **orig_argv = *argv;
123 while (*argc > 0) {
125 const char *cmd = (*argv)[0];
126 if (cmd[0] != '-')
127 break;
128 /*
130 * For legacy reasons, the "version" and "help"
131 * commands can be written with "--" prepended
132 * to make them look like flags.
133 */
134 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
135 break;
136 /*
138 * Check remaining flags.
139 */
140 if (skip_prefix(cmd, "--exec-path", &cmd)) {
141 if (*cmd == '=')
142 git_set_argv_exec_path(cmd + 1);
143 else {
144 puts(git_exec_path());
145 exit(0);
146 }
147 } else if (!strcmp(cmd, "--html-path")) {
148 puts(system_path(GIT_HTML_PATH));
149 exit(0);
150 } else if (!strcmp(cmd, "--man-path")) {
151 puts(system_path(GIT_MAN_PATH));
152 exit(0);
153 } else if (!strcmp(cmd, "--info-path")) {
154 puts(system_path(GIT_INFO_PATH));
155 exit(0);
156 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
157 use_pager = 1;
158 } else if (!strcmp(cmd, "--no-pager")) {
159 use_pager = 0;
160 if (envchanged)
161 *envchanged = 1;
162 } else if (!strcmp(cmd, "--no-replace-objects")) {
163 check_replace_refs = 0;
164 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
165 if (envchanged)
166 *envchanged = 1;
167 } else if (!strcmp(cmd, "--git-dir")) {
168 if (*argc < 2) {
169 fprintf(stderr, _("no directory given for --git-dir\n" ));
170 usage(git_usage_string);
171 }
172 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
173 if (envchanged)
174 *envchanged = 1;
175 (*argv)++;
176 (*argc)--;
177 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
178 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
179 if (envchanged)
180 *envchanged = 1;
181 } else if (!strcmp(cmd, "--namespace")) {
182 if (*argc < 2) {
183 fprintf(stderr, _("no namespace given for --namespace\n" ));
184 usage(git_usage_string);
185 }
186 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
187 if (envchanged)
188 *envchanged = 1;
189 (*argv)++;
190 (*argc)--;
191 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
192 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
193 if (envchanged)
194 *envchanged = 1;
195 } else if (!strcmp(cmd, "--work-tree")) {
196 if (*argc < 2) {
197 fprintf(stderr, _("no directory given for --work-tree\n" ));
198 usage(git_usage_string);
199 }
200 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
201 if (envchanged)
202 *envchanged = 1;
203 (*argv)++;
204 (*argc)--;
205 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
206 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
207 if (envchanged)
208 *envchanged = 1;
209 } else if (!strcmp(cmd, "--super-prefix")) {
210 if (*argc < 2) {
211 fprintf(stderr, _("no prefix given for --super-prefix\n" ));
212 usage(git_usage_string);
213 }
214 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
215 if (envchanged)
216 *envchanged = 1;
217 (*argv)++;
218 (*argc)--;
219 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
220 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
221 if (envchanged)
222 *envchanged = 1;
223 } else if (!strcmp(cmd, "--bare")) {
224 char *cwd = xgetcwd();
225 is_bare_repository_cfg = 1;
226 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
227 free(cwd);
228 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
229 if (envchanged)
230 *envchanged = 1;
231 } else if (!strcmp(cmd, "-c")) {
232 if (*argc < 2) {
233 fprintf(stderr, _("-c expects a configuration string\n" ));
234 usage(git_usage_string);
235 }
236 git_config_push_parameter((*argv)[1]);
237 (*argv)++;
238 (*argc)--;
239 } else if (!strcmp(cmd, "--literal-pathspecs")) {
240 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
241 if (envchanged)
242 *envchanged = 1;
243 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
244 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
245 if (envchanged)
246 *envchanged = 1;
247 } else if (!strcmp(cmd, "--glob-pathspecs")) {
248 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
249 if (envchanged)
250 *envchanged = 1;
251 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
252 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
253 if (envchanged)
254 *envchanged = 1;
255 } else if (!strcmp(cmd, "--icase-pathspecs")) {
256 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
257 if (envchanged)
258 *envchanged = 1;
259 } else if (!strcmp(cmd, "--no-optional-locks")) {
260 setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
261 if (envchanged)
262 *envchanged = 1;
263 } else if (!strcmp(cmd, "--shallow-file")) {
264 (*argv)++;
265 (*argc)--;
266 set_alternate_shallow_file((*argv)[0], 1);
267 if (envchanged)
268 *envchanged = 1;
269 } else if (!strcmp(cmd, "-C")) {
270 if (*argc < 2) {
271 fprintf(stderr, _("no directory given for -C\n" ));
272 usage(git_usage_string);
273 }
274 if ((*argv)[1][0]) {
275 if (chdir((*argv)[1]))
276 die_errno("cannot change to '%s'", (*argv)[1]);
277 if (envchanged)
278 *envchanged = 1;
279 }
280 (*argv)++;
281 (*argc)--;
282 } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
283 if (!strcmp(cmd, "parseopt")) {
284 struct string_list list = STRING_LIST_INIT_DUP;
285 int i;
286 list_builtins(&list, NO_PARSEOPT);
288 for (i = 0; i < list.nr; i++)
289 printf("%s ", list.items[i].string);
290 string_list_clear(&list, 0);
291 exit(0);
292 } else {
293 exit(list_cmds(cmd));
294 }
295 } else {
296 fprintf(stderr, _("unknown option: %s\n"), cmd);
297 usage(git_usage_string);
298 }
299 (*argv)++;
301 (*argc)--;
302 }
303 return (*argv) - orig_argv;
304}
305static int handle_alias(int *argcp, const char ***argv)
307{
308 int envchanged = 0, ret = 0, saved_errno = errno;
309 int count, option_count;
310 const char **new_argv;
311 const char *alias_command;
312 char *alias_string;
313 alias_command = (*argv)[0];
315 alias_string = alias_lookup(alias_command);
316 if (alias_string) {
317 if (alias_string[0] == '!') {
318 struct child_process child = CHILD_PROCESS_INIT;
319 int nongit_ok;
320 /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
322 setup_git_directory_gently(&nongit_ok);
323 commit_pager_choice();
325 child.use_shell = 1;
327 argv_array_push(&child.args, alias_string + 1);
328 argv_array_pushv(&child.args, (*argv) + 1);
329 ret = run_command(&child);
331 if (ret >= 0) /* normal exit */
332 exit(ret);
333 die_errno("while expanding alias '%s': '%s'",
335 alias_command, alias_string + 1);
336 }
337 count = split_cmdline(alias_string, &new_argv);
338 if (count < 0)
339 die("Bad alias.%s string: %s", alias_command,
340 split_cmdline_strerror(count));
341 option_count = handle_options(&new_argv, &count, &envchanged);
342 if (envchanged)
343 die("alias '%s' changes environment variables.\n"
344 "You can use '!git' in the alias to do this",
345 alias_command);
346 memmove(new_argv - option_count, new_argv,
347 count * sizeof(char *));
348 new_argv -= option_count;
349 if (count < 1)
351 die("empty alias for %s", alias_command);
352 if (!strcmp(alias_command, new_argv[0]))
354 die("recursive alias: %s", alias_command);
355 trace_argv_printf(new_argv,
357 "trace: alias expansion: %s =>",
358 alias_command);
359 REALLOC_ARRAY(new_argv, count + *argcp);
361 /* insert after command name */
362 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
363 *argv = new_argv;
365 *argcp += count - 1;
366 ret = 1;
368 }
369 errno = saved_errno;
371 return ret;
373}
374static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
376{
377 int status, help;
378 struct stat st;
379 const char *prefix;
380 prefix = NULL;
382 help = argc == 2 && !strcmp(argv[1], "-h");
383 if (!help) {
384 if (p->option & RUN_SETUP)
385 prefix = setup_git_directory();
386 else if (p->option & RUN_SETUP_GENTLY) {
387 int nongit_ok;
388 prefix = setup_git_directory_gently(&nongit_ok);
389 }
390 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
392 !(p->option & DELAY_PAGER_CONFIG))
393 use_pager = check_pager_config(p->cmd);
394 if (use_pager == -1 && p->option & USE_PAGER)
395 use_pager = 1;
396 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
398 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
399 trace_repo_setup(prefix);
400 }
401 commit_pager_choice();
402 if (!help && get_super_prefix()) {
404 if (!(p->option & SUPPORT_SUPER_PREFIX))
405 die("%s doesn't support --super-prefix", p->cmd);
406 }
407 if (!help && p->option & NEED_WORK_TREE)
409 setup_work_tree();
410 trace_argv_printf(argv, "trace: built-in: git");
412 status = p->fn(argc, argv, prefix);
414 if (status)
415 return status;
416 /* Somebody closed stdout? */
418 if (fstat(fileno(stdout), &st))
419 return 0;
420 /* Ignore write errors for pipes and sockets.. */
421 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
422 return 0;
423 /* Check for ENOSPC and EIO errors.. */
425 if (fflush(stdout))
426 die_errno("write failure on standard output");
427 if (ferror(stdout))
428 die("unknown write failure on standard output");
429 if (fclose(stdout))
430 die_errno("close failed on standard output");
431 return 0;
432}
433static struct cmd_struct commands[] = {
435 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
436 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
437 { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
438 { "apply", cmd_apply, RUN_SETUP_GENTLY },
439 { "archive", cmd_archive, RUN_SETUP_GENTLY },
440 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
441 { "blame", cmd_blame, RUN_SETUP },
442 { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
443 { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT },
444 { "cat-file", cmd_cat_file, RUN_SETUP },
445 { "check-attr", cmd_check_attr, RUN_SETUP },
446 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
447 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
448 { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT },
449 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
450 { "checkout-index", cmd_checkout_index,
451 RUN_SETUP | NEED_WORK_TREE},
452 { "cherry", cmd_cherry, RUN_SETUP },
453 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
454 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
455 { "clone", cmd_clone },
456 { "column", cmd_column, RUN_SETUP_GENTLY },
457 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
458 { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT },
459 { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
460 { "count-objects", cmd_count_objects, RUN_SETUP },
461 { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
462 { "describe", cmd_describe, RUN_SETUP },
463 { "diff", cmd_diff, NO_PARSEOPT },
464 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
465 { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
466 { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
467 { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
468 { "fast-export", cmd_fast_export, RUN_SETUP },
469 { "fetch", cmd_fetch, RUN_SETUP },
470 { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
471 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
472 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
473 { "format-patch", cmd_format_patch, RUN_SETUP },
474 { "fsck", cmd_fsck, RUN_SETUP },
475 { "fsck-objects", cmd_fsck, RUN_SETUP },
476 { "gc", cmd_gc, RUN_SETUP },
477 { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
478 { "grep", cmd_grep, RUN_SETUP_GENTLY },
479 { "hash-object", cmd_hash_object },
480 { "help", cmd_help },
481 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
482 { "init", cmd_init_db },
483 { "init-db", cmd_init_db },
484 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
485 { "log", cmd_log, RUN_SETUP },
486 { "ls-files", cmd_ls_files, RUN_SETUP },
487 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
488 { "ls-tree", cmd_ls_tree, RUN_SETUP },
489 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
490 { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
491 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
492 { "merge-base", cmd_merge_base, RUN_SETUP },
493 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
494 { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
495 { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
496 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
497 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
498 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
499 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
500 { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
501 { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
502 { "mktree", cmd_mktree, RUN_SETUP },
503 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
504 { "name-rev", cmd_name_rev, RUN_SETUP },
505 { "notes", cmd_notes, RUN_SETUP },
506 { "pack-objects", cmd_pack_objects, RUN_SETUP },
507 { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
508 { "pack-refs", cmd_pack_refs, RUN_SETUP },
509 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
510 { "pickaxe", cmd_blame, RUN_SETUP },
511 { "prune", cmd_prune, RUN_SETUP },
512 { "prune-packed", cmd_prune_packed, RUN_SETUP },
513 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
514 { "push", cmd_push, RUN_SETUP },
515 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
516 { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
517 { "receive-pack", cmd_receive_pack },
518 { "reflog", cmd_reflog, RUN_SETUP },
519 { "remote", cmd_remote, RUN_SETUP },
520 { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
521 { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
522 { "repack", cmd_repack, RUN_SETUP },
523 { "replace", cmd_replace, RUN_SETUP },
524 { "rerere", cmd_rerere, RUN_SETUP },
525 { "reset", cmd_reset, RUN_SETUP },
526 { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
527 { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
528 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
529 { "rm", cmd_rm, RUN_SETUP },
530 { "send-pack", cmd_send_pack, RUN_SETUP },
531 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
532 { "show", cmd_show, RUN_SETUP },
533 { "show-branch", cmd_show_branch, RUN_SETUP },
534 { "show-ref", cmd_show_ref, RUN_SETUP },
535 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
536 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
537 { "stripspace", cmd_stripspace },
538 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
539 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
540 { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
541 { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
542 { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
543 { "update-index", cmd_update_index, RUN_SETUP },
544 { "update-ref", cmd_update_ref, RUN_SETUP },
545 { "update-server-info", cmd_update_server_info, RUN_SETUP },
546 { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
547 { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
548 { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
549 { "verify-commit", cmd_verify_commit, RUN_SETUP },
550 { "verify-pack", cmd_verify_pack },
551 { "verify-tag", cmd_verify_tag, RUN_SETUP },
552 { "version", cmd_version },
553 { "whatchanged", cmd_whatchanged, RUN_SETUP },
554 { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT },
555 { "write-tree", cmd_write_tree, RUN_SETUP },
556};
557static struct cmd_struct *get_builtin(const char *s)
559{
560 int i;
561 for (i = 0; i < ARRAY_SIZE(commands); i++) {
562 struct cmd_struct *p = commands + i;
563 if (!strcmp(s, p->cmd))
564 return p;
565 }
566 return NULL;
567}
568int is_builtin(const char *s)
570{
571 return !!get_builtin(s);
572}
573static void list_builtins(struct string_list *out, unsigned int exclude_option)
575{
576 int i;
577 for (i = 0; i < ARRAY_SIZE(commands); i++) {
578 if (exclude_option &&
579 (commands[i].option & exclude_option))
580 continue;
581 string_list_append(out, commands[i].cmd);
582 }
583}
584#ifdef STRIP_EXTENSION
586static void strip_extension(const char **argv)
587{
588 size_t len;
589 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
591 argv[0] = xmemdupz(argv[0], len);
592}
593#else
594#define strip_extension(cmd)
595#endif
596static void handle_builtin(int argc, const char **argv)
598{
599 struct argv_array args = ARGV_ARRAY_INIT;
600 const char *cmd;
601 struct cmd_struct *builtin;
602 strip_extension(argv);
604 cmd = argv[0];
605 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
607 if (argc > 1 && !strcmp(argv[1], "--help")) {
608 int i;
609 argv[1] = argv[0];
611 argv[0] = cmd = "help";
612 for (i = 0; i < argc; i++) {
614 argv_array_push(&args, argv[i]);
615 if (!i)
616 argv_array_push(&args, "--exclude-guides");
617 }
618 argc++;
620 argv = args.argv;
621 }
622 builtin = get_builtin(cmd);
624 if (builtin)
625 exit(run_builtin(builtin, argc, argv));
626 argv_array_clear(&args);
627}
628static void execv_dashed_external(const char **argv)
630{
631 struct child_process cmd = CHILD_PROCESS_INIT;
632 int status;
633 if (get_super_prefix())
635 die("%s doesn't support --super-prefix", argv[0]);
636 if (use_pager == -1 && !is_builtin(argv[0]))
638 use_pager = check_pager_config(argv[0]);
639 commit_pager_choice();
640 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
642 argv_array_pushv(&cmd.args, argv + 1);
643 cmd.clean_on_exit = 1;
644 cmd.wait_after_clean = 1;
645 cmd.silent_exec_failure = 1;
646 trace_argv_printf(cmd.args.argv, "trace: exec:");
648 /*
650 * If we fail because the command is not found, it is
651 * OK to return. Otherwise, we just pass along the status code,
652 * or our usual generic code if we were not even able to exec
653 * the program.
654 */
655 status = run_command(&cmd);
656 if (status >= 0)
657 exit(status);
658 else if (errno != ENOENT)
659 exit(128);
660}
661static int run_argv(int *argcp, const char ***argv)
663{
664 int done_alias = 0;
665 while (1) {
667 /*
668 * If we tried alias and futzed with our environment,
669 * it no longer is safe to invoke builtins directly in
670 * general. We have to spawn them as dashed externals.
671 *
672 * NEEDSWORK: if we can figure out cases
673 * where it is safe to do, we can avoid spawning a new
674 * process.
675 */
676 if (!done_alias)
677 handle_builtin(*argcp, *argv);
678 /* .. then try the external ones */
680 execv_dashed_external(*argv);
681 /* It could be an alias -- this works around the insanity
683 * of overriding "git log" with "git show" by having
684 * alias.log = show
685 */
686 if (done_alias)
687 break;
688 if (!handle_alias(argcp, argv))
689 break;
690 done_alias = 1;
691 }
692 return done_alias;
694}
695int cmd_main(int argc, const char **argv)
697{
698 const char *cmd;
699 int done_help = 0;
700 cmd = argv[0];
702 if (!cmd)
703 cmd = "git-help";
704 else {
705 const char *slash = find_last_dir_sep(cmd);
706 if (slash)
707 cmd = slash + 1;
708 }
709 trace_command_performance(argv);
711 /*
713 * "git-xxxx" is the same as "git xxxx", but we obviously:
714 *
715 * - cannot take flags in between the "git" and the "xxxx".
716 * - cannot execute it externally (since it would just do
717 * the same thing over again)
718 *
719 * So we just directly call the builtin handler, and die if
720 * that one cannot handle it.
721 */
722 if (skip_prefix(cmd, "git-", &cmd)) {
723 argv[0] = cmd;
724 handle_builtin(argc, argv);
725 die("cannot handle %s as a builtin", cmd);
726 }
727 /* Look for flags.. */
729 argv++;
730 argc--;
731 handle_options(&argv, &argc, NULL);
732 if (argc > 0) {
733 /* translate --help and --version into commands */
734 skip_prefix(argv[0], "--", &argv[0]);
735 } else {
736 /* The user didn't specify a command; give them help */
737 commit_pager_choice();
738 printf("usage: %s\n\n", git_usage_string);
739 list_common_cmds_help();
740 printf("\n%s\n", _(git_more_info_string));
741 exit(1);
742 }
743 cmd = argv[0];
744 /*
746 * We use PATH to find git commands, but we prepend some higher
747 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
748 * environment, and the $(gitexecdir) from the Makefile at build
749 * time.
750 */
751 setup_path();
752 while (1) {
754 int was_alias = run_argv(&argc, &argv);
755 if (errno != ENOENT)
756 break;
757 if (was_alias) {
758 fprintf(stderr, _("expansion of alias '%s' failed; "
759 "'%s' is not a git command\n"),
760 cmd, argv[0]);
761 exit(1);
762 }
763 if (!done_help) {
764 cmd = argv[0] = help_unknown_cmd(cmd);
765 done_help = 1;
766 } else
767 break;
768 }
769 fprintf(stderr, _("failed to run command '%s': %s\n"),
771 cmd, strerror(errno));
772 return 1;
774}