Merge branch 'rb/hpe'
[git.git] / git.c
blob0ce0e13f0f4879ae4608bd61d3a6a1f55ef7892e
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"
8 #define RUN_SETUP (1<<0)
9 #define RUN_SETUP_GENTLY (1<<1)
10 #define USE_PAGER (1<<2)
12 * require working tree to be present -- anything uses this needs
13 * RUN_SETUP for reading from the configuration file.
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 */
20 struct cmd_struct {
21 const char *cmd;
22 int (*fn)(int, const char **, const char *);
23 unsigned int option;
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>]");
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.");
38 static int use_pager = -1;
40 static void list_builtins(struct string_list *list, unsigned int exclude_option);
42 static void exclude_helpers_from_list(struct string_list *list)
44 int i = 0;
46 while (i < list->nr) {
47 if (strstr(list->items[i].string, "--"))
48 unsorted_string_list_delete_item(list, i, 0);
49 else
50 i++;
54 static int match_token(const char *spec, int len, const char *token)
56 int token_len = strlen(token);
58 return len == token_len && !strncmp(spec, token, token_len);
61 static int list_cmds(const char *spec)
63 struct string_list list = STRING_LIST_INIT_DUP;
64 int i;
66 while (*spec) {
67 const char *sep = strchrnul(spec, ',');
68 int len = sep - spec;
70 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 (match_token(spec, len, "alias"))
79 list_aliases(&list);
80 else if (match_token(spec, len, "config"))
81 list_cmds_by_config(&list);
82 else if (len > 5 && !strncmp(spec, "list-", 5)) {
83 struct strbuf sb = STRBUF_INIT;
85 strbuf_add(&sb, spec + 5, len - 5);
86 list_cmds_by_category(&list, sb.buf);
87 strbuf_release(&sb);
89 else
90 die(_("unsupported command listing type '%s'"), spec);
91 spec += len;
92 if (*spec == ',')
93 spec++;
95 for (i = 0; i < list.nr; i++)
96 puts(list.items[i].string);
97 string_list_clear(&list, 0);
98 return 0;
101 static void commit_pager_choice(void)
103 switch (use_pager) {
104 case 0:
105 setenv("GIT_PAGER", "cat", 1);
106 break;
107 case 1:
108 setup_pager();
109 break;
110 default:
111 break;
115 void setup_auto_pager(const char *cmd, int def)
117 if (use_pager != -1 || pager_in_use())
118 return;
119 use_pager = check_pager_config(cmd);
120 if (use_pager == -1)
121 use_pager = def;
122 commit_pager_choice();
125 static int handle_options(const char ***argv, int *argc, int *envchanged)
127 const char **orig_argv = *argv;
129 while (*argc > 0) {
130 const char *cmd = (*argv)[0];
131 if (cmd[0] != '-')
132 break;
135 * For legacy reasons, the "version" and "help"
136 * commands can be written with "--" prepended
137 * to make them look like flags.
139 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
140 break;
143 * Check remaining flags.
145 if (skip_prefix(cmd, "--exec-path", &cmd)) {
146 if (*cmd == '=')
147 git_set_exec_path(cmd + 1);
148 else {
149 puts(git_exec_path());
150 exit(0);
152 } else if (!strcmp(cmd, "--html-path")) {
153 puts(system_path(GIT_HTML_PATH));
154 exit(0);
155 } else if (!strcmp(cmd, "--man-path")) {
156 puts(system_path(GIT_MAN_PATH));
157 exit(0);
158 } else if (!strcmp(cmd, "--info-path")) {
159 puts(system_path(GIT_INFO_PATH));
160 exit(0);
161 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
162 use_pager = 1;
163 } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) {
164 use_pager = 0;
165 if (envchanged)
166 *envchanged = 1;
167 } else if (!strcmp(cmd, "--no-replace-objects")) {
168 read_replace_refs = 0;
169 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
170 if (envchanged)
171 *envchanged = 1;
172 } else if (!strcmp(cmd, "--git-dir")) {
173 if (*argc < 2) {
174 fprintf(stderr, _("no directory given for --git-dir\n" ));
175 usage(git_usage_string);
177 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
178 if (envchanged)
179 *envchanged = 1;
180 (*argv)++;
181 (*argc)--;
182 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
183 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
184 if (envchanged)
185 *envchanged = 1;
186 } else if (!strcmp(cmd, "--namespace")) {
187 if (*argc < 2) {
188 fprintf(stderr, _("no namespace given for --namespace\n" ));
189 usage(git_usage_string);
191 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
192 if (envchanged)
193 *envchanged = 1;
194 (*argv)++;
195 (*argc)--;
196 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
197 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
198 if (envchanged)
199 *envchanged = 1;
200 } else if (!strcmp(cmd, "--work-tree")) {
201 if (*argc < 2) {
202 fprintf(stderr, _("no directory given for --work-tree\n" ));
203 usage(git_usage_string);
205 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
206 if (envchanged)
207 *envchanged = 1;
208 (*argv)++;
209 (*argc)--;
210 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
211 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
212 if (envchanged)
213 *envchanged = 1;
214 } else if (!strcmp(cmd, "--super-prefix")) {
215 if (*argc < 2) {
216 fprintf(stderr, _("no prefix given for --super-prefix\n" ));
217 usage(git_usage_string);
219 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
220 if (envchanged)
221 *envchanged = 1;
222 (*argv)++;
223 (*argc)--;
224 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
225 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
226 if (envchanged)
227 *envchanged = 1;
228 } else if (!strcmp(cmd, "--bare")) {
229 char *cwd = xgetcwd();
230 is_bare_repository_cfg = 1;
231 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
232 free(cwd);
233 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
234 if (envchanged)
235 *envchanged = 1;
236 } else if (!strcmp(cmd, "-c")) {
237 if (*argc < 2) {
238 fprintf(stderr, _("-c expects a configuration string\n" ));
239 usage(git_usage_string);
241 git_config_push_parameter((*argv)[1]);
242 (*argv)++;
243 (*argc)--;
244 } else if (!strcmp(cmd, "--literal-pathspecs")) {
245 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
246 if (envchanged)
247 *envchanged = 1;
248 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
249 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
250 if (envchanged)
251 *envchanged = 1;
252 } else if (!strcmp(cmd, "--glob-pathspecs")) {
253 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
254 if (envchanged)
255 *envchanged = 1;
256 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
257 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
258 if (envchanged)
259 *envchanged = 1;
260 } else if (!strcmp(cmd, "--icase-pathspecs")) {
261 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
262 if (envchanged)
263 *envchanged = 1;
264 } else if (!strcmp(cmd, "--no-optional-locks")) {
265 setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
266 if (envchanged)
267 *envchanged = 1;
268 } else if (!strcmp(cmd, "--shallow-file")) {
269 (*argv)++;
270 (*argc)--;
271 set_alternate_shallow_file(the_repository, (*argv)[0], 1);
272 if (envchanged)
273 *envchanged = 1;
274 } else if (!strcmp(cmd, "-C")) {
275 if (*argc < 2) {
276 fprintf(stderr, _("no directory given for -C\n" ));
277 usage(git_usage_string);
279 if ((*argv)[1][0]) {
280 if (chdir((*argv)[1]))
281 die_errno("cannot change to '%s'", (*argv)[1]);
282 if (envchanged)
283 *envchanged = 1;
285 (*argv)++;
286 (*argc)--;
287 } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
288 if (!strcmp(cmd, "parseopt")) {
289 struct string_list list = STRING_LIST_INIT_DUP;
290 int i;
292 list_builtins(&list, NO_PARSEOPT);
293 for (i = 0; i < list.nr; i++)
294 printf("%s ", list.items[i].string);
295 string_list_clear(&list, 0);
296 exit(0);
297 } else {
298 exit(list_cmds(cmd));
300 } else {
301 fprintf(stderr, _("unknown option: %s\n"), cmd);
302 usage(git_usage_string);
305 (*argv)++;
306 (*argc)--;
308 return (*argv) - orig_argv;
311 static int handle_alias(int *argcp, const char ***argv)
313 int envchanged = 0, ret = 0, saved_errno = errno;
314 int count, option_count;
315 const char **new_argv;
316 const char *alias_command;
317 char *alias_string;
319 alias_command = (*argv)[0];
320 alias_string = alias_lookup(alias_command);
321 if (alias_string) {
322 if (*argcp > 1 && !strcmp((*argv)[1], "-h"))
323 fprintf_ln(stderr, _("'%s' is aliased to '%s'"),
324 alias_command, alias_string);
325 if (alias_string[0] == '!') {
326 struct child_process child = CHILD_PROCESS_INIT;
327 int nongit_ok;
329 /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
330 setup_git_directory_gently(&nongit_ok);
332 commit_pager_choice();
334 child.use_shell = 1;
335 argv_array_push(&child.args, alias_string + 1);
336 argv_array_pushv(&child.args, (*argv) + 1);
338 ret = run_command(&child);
339 if (ret >= 0) /* normal exit */
340 exit(ret);
342 die_errno(_("while expanding alias '%s': '%s'"),
343 alias_command, alias_string + 1);
345 count = split_cmdline(alias_string, &new_argv);
346 if (count < 0)
347 die(_("bad alias.%s string: %s"), alias_command,
348 _(split_cmdline_strerror(count)));
349 option_count = handle_options(&new_argv, &count, &envchanged);
350 if (envchanged)
351 die(_("alias '%s' changes environment variables.\n"
352 "You can use '!git' in the alias to do this"),
353 alias_command);
354 memmove(new_argv - option_count, new_argv,
355 count * sizeof(char *));
356 new_argv -= option_count;
358 if (count < 1)
359 die(_("empty alias for %s"), alias_command);
361 if (!strcmp(alias_command, new_argv[0]))
362 die(_("recursive alias: %s"), alias_command);
364 trace_argv_printf(new_argv,
365 "trace: alias expansion: %s =>",
366 alias_command);
368 REALLOC_ARRAY(new_argv, count + *argcp);
369 /* insert after command name */
370 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
372 *argv = new_argv;
373 *argcp += count - 1;
375 ret = 1;
378 errno = saved_errno;
380 return ret;
383 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
385 int status, help;
386 struct stat st;
387 const char *prefix;
389 prefix = NULL;
390 help = argc == 2 && !strcmp(argv[1], "-h");
391 if (!help) {
392 if (p->option & RUN_SETUP)
393 prefix = setup_git_directory();
394 else if (p->option & RUN_SETUP_GENTLY) {
395 int nongit_ok;
396 prefix = setup_git_directory_gently(&nongit_ok);
399 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
400 !(p->option & DELAY_PAGER_CONFIG))
401 use_pager = check_pager_config(p->cmd);
402 if (use_pager == -1 && p->option & USE_PAGER)
403 use_pager = 1;
405 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
406 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
407 trace_repo_setup(prefix);
409 commit_pager_choice();
411 if (!help && get_super_prefix()) {
412 if (!(p->option & SUPPORT_SUPER_PREFIX))
413 die(_("%s doesn't support --super-prefix"), p->cmd);
416 if (!help && p->option & NEED_WORK_TREE)
417 setup_work_tree();
419 trace_argv_printf(argv, "trace: built-in: git");
421 validate_cache_entries(&the_index);
422 status = p->fn(argc, argv, prefix);
423 validate_cache_entries(&the_index);
425 if (status)
426 return status;
428 /* Somebody closed stdout? */
429 if (fstat(fileno(stdout), &st))
430 return 0;
431 /* Ignore write errors for pipes and sockets.. */
432 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
433 return 0;
435 /* Check for ENOSPC and EIO errors.. */
436 if (fflush(stdout))
437 die_errno(_("write failure on standard output"));
438 if (ferror(stdout))
439 die(_("unknown write failure on standard output"));
440 if (fclose(stdout))
441 die_errno(_("close failed on standard output"));
442 return 0;
445 static struct cmd_struct commands[] = {
446 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
447 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
448 { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
449 { "apply", cmd_apply, RUN_SETUP_GENTLY },
450 { "archive", cmd_archive, RUN_SETUP_GENTLY },
451 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
452 { "blame", cmd_blame, RUN_SETUP },
453 { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
454 { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT },
455 { "cat-file", cmd_cat_file, RUN_SETUP },
456 { "check-attr", cmd_check_attr, RUN_SETUP },
457 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
458 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
459 { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT },
460 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
461 { "checkout-index", cmd_checkout_index,
462 RUN_SETUP | NEED_WORK_TREE},
463 { "cherry", cmd_cherry, RUN_SETUP },
464 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
465 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
466 { "clone", cmd_clone },
467 { "column", cmd_column, RUN_SETUP_GENTLY },
468 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
469 { "commit-graph", cmd_commit_graph, RUN_SETUP },
470 { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT },
471 { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
472 { "count-objects", cmd_count_objects, RUN_SETUP },
473 { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
474 { "describe", cmd_describe, RUN_SETUP },
475 { "diff", cmd_diff, NO_PARSEOPT },
476 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
477 { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
478 { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
479 { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
480 { "fast-export", cmd_fast_export, RUN_SETUP },
481 { "fetch", cmd_fetch, RUN_SETUP },
482 { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
483 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
484 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
485 { "format-patch", cmd_format_patch, RUN_SETUP },
486 { "fsck", cmd_fsck, RUN_SETUP },
487 { "fsck-objects", cmd_fsck, RUN_SETUP },
488 { "gc", cmd_gc, RUN_SETUP },
489 { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT },
490 { "grep", cmd_grep, RUN_SETUP_GENTLY },
491 { "hash-object", cmd_hash_object },
492 { "help", cmd_help },
493 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT },
494 { "init", cmd_init_db },
495 { "init-db", cmd_init_db },
496 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
497 { "log", cmd_log, RUN_SETUP },
498 { "ls-files", cmd_ls_files, RUN_SETUP },
499 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
500 { "ls-tree", cmd_ls_tree, RUN_SETUP },
501 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
502 { "mailsplit", cmd_mailsplit, NO_PARSEOPT },
503 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
504 { "merge-base", cmd_merge_base, RUN_SETUP },
505 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
506 { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT },
507 { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT },
508 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
509 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
510 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
511 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
512 { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
513 { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
514 { "mktree", cmd_mktree, RUN_SETUP },
515 { "multi-pack-index", cmd_multi_pack_index, RUN_SETUP_GENTLY },
516 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
517 { "name-rev", cmd_name_rev, RUN_SETUP },
518 { "notes", cmd_notes, RUN_SETUP },
519 { "pack-objects", cmd_pack_objects, RUN_SETUP },
520 { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT },
521 { "pack-refs", cmd_pack_refs, RUN_SETUP },
522 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT },
523 { "pickaxe", cmd_blame, RUN_SETUP },
524 { "prune", cmd_prune, RUN_SETUP },
525 { "prune-packed", cmd_prune_packed, RUN_SETUP },
526 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
527 { "push", cmd_push, RUN_SETUP },
528 { "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER },
529 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
531 * NEEDSWORK: Until the rebase is independent and needs no redirection
532 * to rebase shell script this is kept as is, then should be changed to
533 * RUN_SETUP | NEED_WORK_TREE
535 { "rebase", cmd_rebase },
536 { "rebase--interactive", cmd_rebase__interactive, RUN_SETUP | NEED_WORK_TREE },
537 { "receive-pack", cmd_receive_pack },
538 { "reflog", cmd_reflog, RUN_SETUP },
539 { "remote", cmd_remote, RUN_SETUP },
540 { "remote-ext", cmd_remote_ext, NO_PARSEOPT },
541 { "remote-fd", cmd_remote_fd, NO_PARSEOPT },
542 { "repack", cmd_repack, RUN_SETUP },
543 { "replace", cmd_replace, RUN_SETUP },
544 { "rerere", cmd_rerere, RUN_SETUP },
545 { "reset", cmd_reset, RUN_SETUP },
546 { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT },
547 { "rev-parse", cmd_rev_parse, NO_PARSEOPT },
548 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
549 { "rm", cmd_rm, RUN_SETUP },
550 { "send-pack", cmd_send_pack, RUN_SETUP },
551 { "serve", cmd_serve, RUN_SETUP },
552 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
553 { "show", cmd_show, RUN_SETUP },
554 { "show-branch", cmd_show_branch, RUN_SETUP },
555 { "show-index", cmd_show_index },
556 { "show-ref", cmd_show_ref, RUN_SETUP },
557 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
558 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
559 { "stripspace", cmd_stripspace },
560 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
561 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
562 { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
563 { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT },
564 { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT },
565 { "update-index", cmd_update_index, RUN_SETUP },
566 { "update-ref", cmd_update_ref, RUN_SETUP },
567 { "update-server-info", cmd_update_server_info, RUN_SETUP },
568 { "upload-archive", cmd_upload_archive, NO_PARSEOPT },
569 { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
570 { "upload-pack", cmd_upload_pack },
571 { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
572 { "verify-commit", cmd_verify_commit, RUN_SETUP },
573 { "verify-pack", cmd_verify_pack },
574 { "verify-tag", cmd_verify_tag, RUN_SETUP },
575 { "version", cmd_version },
576 { "whatchanged", cmd_whatchanged, RUN_SETUP },
577 { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT },
578 { "write-tree", cmd_write_tree, RUN_SETUP },
581 static struct cmd_struct *get_builtin(const char *s)
583 int i;
584 for (i = 0; i < ARRAY_SIZE(commands); i++) {
585 struct cmd_struct *p = commands + i;
586 if (!strcmp(s, p->cmd))
587 return p;
589 return NULL;
592 int is_builtin(const char *s)
594 return !!get_builtin(s);
597 static void list_builtins(struct string_list *out, unsigned int exclude_option)
599 int i;
600 for (i = 0; i < ARRAY_SIZE(commands); i++) {
601 if (exclude_option &&
602 (commands[i].option & exclude_option))
603 continue;
604 string_list_append(out, commands[i].cmd);
608 #ifdef STRIP_EXTENSION
609 static void strip_extension(const char **argv)
611 size_t len;
613 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
614 argv[0] = xmemdupz(argv[0], len);
616 #else
617 #define strip_extension(cmd)
618 #endif
620 static void handle_builtin(int argc, const char **argv)
622 struct argv_array args = ARGV_ARRAY_INIT;
623 const char *cmd;
624 struct cmd_struct *builtin;
626 strip_extension(argv);
627 cmd = argv[0];
629 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
630 if (argc > 1 && !strcmp(argv[1], "--help")) {
631 int i;
633 argv[1] = argv[0];
634 argv[0] = cmd = "help";
636 for (i = 0; i < argc; i++) {
637 argv_array_push(&args, argv[i]);
638 if (!i)
639 argv_array_push(&args, "--exclude-guides");
642 argc++;
643 argv = args.argv;
646 builtin = get_builtin(cmd);
647 if (builtin)
648 exit(run_builtin(builtin, argc, argv));
649 argv_array_clear(&args);
652 static void execv_dashed_external(const char **argv)
654 struct child_process cmd = CHILD_PROCESS_INIT;
655 int status;
657 if (get_super_prefix())
658 die(_("%s doesn't support --super-prefix"), argv[0]);
660 if (use_pager == -1 && !is_builtin(argv[0]))
661 use_pager = check_pager_config(argv[0]);
662 commit_pager_choice();
664 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
665 argv_array_pushv(&cmd.args, argv + 1);
666 cmd.clean_on_exit = 1;
667 cmd.wait_after_clean = 1;
668 cmd.silent_exec_failure = 1;
670 trace_argv_printf(cmd.args.argv, "trace: exec:");
673 * If we fail because the command is not found, it is
674 * OK to return. Otherwise, we just pass along the status code,
675 * or our usual generic code if we were not even able to exec
676 * the program.
678 status = run_command(&cmd);
679 if (status >= 0)
680 exit(status);
681 else if (errno != ENOENT)
682 exit(128);
685 static int run_argv(int *argcp, const char ***argv)
687 int done_alias = 0;
688 struct string_list cmd_list = STRING_LIST_INIT_NODUP;
689 struct string_list_item *seen;
691 while (1) {
693 * If we tried alias and futzed with our environment,
694 * it no longer is safe to invoke builtins directly in
695 * general. We have to spawn them as dashed externals.
697 * NEEDSWORK: if we can figure out cases
698 * where it is safe to do, we can avoid spawning a new
699 * process.
701 if (!done_alias)
702 handle_builtin(*argcp, *argv);
704 /* .. then try the external ones */
705 execv_dashed_external(*argv);
707 seen = unsorted_string_list_lookup(&cmd_list, *argv[0]);
708 if (seen) {
709 int i;
710 struct strbuf sb = STRBUF_INIT;
711 for (i = 0; i < cmd_list.nr; i++) {
712 struct string_list_item *item = &cmd_list.items[i];
714 strbuf_addf(&sb, "\n %s", item->string);
715 if (item == seen)
716 strbuf_addstr(&sb, " <==");
717 else if (i == cmd_list.nr - 1)
718 strbuf_addstr(&sb, " ==>");
720 die(_("alias loop detected: expansion of '%s' does"
721 " not terminate:%s"), cmd_list.items[0].string, sb.buf);
724 string_list_append(&cmd_list, *argv[0]);
727 * It could be an alias -- this works around the insanity
728 * of overriding "git log" with "git show" by having
729 * alias.log = show
731 if (!handle_alias(argcp, argv))
732 break;
733 done_alias = 1;
736 string_list_clear(&cmd_list, 0);
738 return done_alias;
741 int cmd_main(int argc, const char **argv)
743 const char *cmd;
744 int done_help = 0;
746 cmd = argv[0];
747 if (!cmd)
748 cmd = "git-help";
749 else {
750 const char *slash = find_last_dir_sep(cmd);
751 if (slash)
752 cmd = slash + 1;
755 trace_command_performance(argv);
758 * "git-xxxx" is the same as "git xxxx", but we obviously:
760 * - cannot take flags in between the "git" and the "xxxx".
761 * - cannot execute it externally (since it would just do
762 * the same thing over again)
764 * So we just directly call the builtin handler, and die if
765 * that one cannot handle it.
767 if (skip_prefix(cmd, "git-", &cmd)) {
768 argv[0] = cmd;
769 handle_builtin(argc, argv);
770 die(_("cannot handle %s as a builtin"), cmd);
773 /* Look for flags.. */
774 argv++;
775 argc--;
776 handle_options(&argv, &argc, NULL);
777 if (argc > 0) {
778 /* translate --help and --version into commands */
779 skip_prefix(argv[0], "--", &argv[0]);
780 } else {
781 /* The user didn't specify a command; give them help */
782 commit_pager_choice();
783 printf(_("usage: %s\n\n"), git_usage_string);
784 list_common_cmds_help();
785 printf("\n%s\n", _(git_more_info_string));
786 exit(1);
788 cmd = argv[0];
791 * We use PATH to find git commands, but we prepend some higher
792 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
793 * environment, and the $(gitexecdir) from the Makefile at build
794 * time.
796 setup_path();
798 while (1) {
799 int was_alias = run_argv(&argc, &argv);
800 if (errno != ENOENT)
801 break;
802 if (was_alias) {
803 fprintf(stderr, _("expansion of alias '%s' failed; "
804 "'%s' is not a git command\n"),
805 cmd, argv[0]);
806 exit(1);
808 if (!done_help) {
809 cmd = argv[0] = help_unknown_cmd(cmd);
810 done_help = 1;
811 } else
812 break;
815 fprintf(stderr, _("failed to run command '%s': %s\n"),
816 cmd, strerror(errno));
818 return 1;