1#include "builtin.h"
2#include "config.h"
3#include "exec_cmd.h"
4#include "help.h"
5#include "run-command.h"
6const char git_usage_string[] =
8 N_("git [--version] [--help] [-C <path>] [-c <name>=<value>]\n"
9 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
10 " [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--bare]\n"
11 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
12 " <command> [<args>]");
13const char git_more_info_string[] =
15 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
16 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
17 "to read about a specific subcommand or concept.");
18static int use_pager = -1;
20static void list_builtins(void);
22static void commit_pager_choice(void) {
24 switch (use_pager) {
25 case 0:
26 setenv("GIT_PAGER", "cat", 1);
27 break;
28 case 1:
29 setup_pager();
30 break;
31 default:
32 break;
33 }
34}
35void setup_auto_pager(const char *cmd, int def)
37{
38 if (use_pager != -1 || pager_in_use())
39 return;
40 use_pager = check_pager_config(cmd);
41 if (use_pager == -1)
42 use_pager = def;
43 commit_pager_choice();
44}
45static int handle_options(const char ***argv, int *argc, int *envchanged)
47{
48 const char **orig_argv = *argv;
49 while (*argc > 0) {
51 const char *cmd = (*argv)[0];
52 if (cmd[0] != '-')
53 break;
54 /*
56 * For legacy reasons, the "version" and "help"
57 * commands can be written with "--" prepended
58 * to make them look like flags.
59 */
60 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
61 break;
62 /*
64 * Check remaining flags.
65 */
66 if (skip_prefix(cmd, "--exec-path", &cmd)) {
67 if (*cmd == '=')
68 git_set_argv_exec_path(cmd + 1);
69 else {
70 puts(git_exec_path());
71 exit(0);
72 }
73 } else if (!strcmp(cmd, "--html-path")) {
74 puts(system_path(GIT_HTML_PATH));
75 exit(0);
76 } else if (!strcmp(cmd, "--man-path")) {
77 puts(system_path(GIT_MAN_PATH));
78 exit(0);
79 } else if (!strcmp(cmd, "--info-path")) {
80 puts(system_path(GIT_INFO_PATH));
81 exit(0);
82 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
83 use_pager = 1;
84 } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) {
85 use_pager = 0;
86 if (envchanged)
87 *envchanged = 1;
88 } else if (!strcmp(cmd, "--no-replace-objects")) {
89 check_replace_refs = 0;
90 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
91 if (envchanged)
92 *envchanged = 1;
93 } else if (!strcmp(cmd, "--git-dir")) {
94 if (*argc < 2) {
95 fprintf(stderr, _("no directory given for --git-dir\n" ));
96 usage(git_usage_string);
97 }
98 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
99 if (envchanged)
100 *envchanged = 1;
101 (*argv)++;
102 (*argc)--;
103 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
104 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
105 if (envchanged)
106 *envchanged = 1;
107 } else if (!strcmp(cmd, "--namespace")) {
108 if (*argc < 2) {
109 fprintf(stderr, _("no namespace given for --namespace\n" ));
110 usage(git_usage_string);
111 }
112 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
113 if (envchanged)
114 *envchanged = 1;
115 (*argv)++;
116 (*argc)--;
117 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
118 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
119 if (envchanged)
120 *envchanged = 1;
121 } else if (!strcmp(cmd, "--work-tree")) {
122 if (*argc < 2) {
123 fprintf(stderr, _("no directory given for --work-tree\n" ));
124 usage(git_usage_string);
125 }
126 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
127 if (envchanged)
128 *envchanged = 1;
129 (*argv)++;
130 (*argc)--;
131 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
132 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
133 if (envchanged)
134 *envchanged = 1;
135 } else if (!strcmp(cmd, "--super-prefix")) {
136 if (*argc < 2) {
137 fprintf(stderr, _("no prefix given for --super-prefix\n" ));
138 usage(git_usage_string);
139 }
140 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
141 if (envchanged)
142 *envchanged = 1;
143 (*argv)++;
144 (*argc)--;
145 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
146 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
147 if (envchanged)
148 *envchanged = 1;
149 } else if (!strcmp(cmd, "--bare")) {
150 char *cwd = xgetcwd();
151 is_bare_repository_cfg = 1;
152 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
153 free(cwd);
154 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
155 if (envchanged)
156 *envchanged = 1;
157 } else if (!strcmp(cmd, "-c")) {
158 if (*argc < 2) {
159 fprintf(stderr, _("-c expects a configuration string\n" ));
160 usage(git_usage_string);
161 }
162 git_config_push_parameter((*argv)[1]);
163 (*argv)++;
164 (*argc)--;
165 } else if (!strcmp(cmd, "--literal-pathspecs")) {
166 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
167 if (envchanged)
168 *envchanged = 1;
169 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
170 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
171 if (envchanged)
172 *envchanged = 1;
173 } else if (!strcmp(cmd, "--glob-pathspecs")) {
174 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
175 if (envchanged)
176 *envchanged = 1;
177 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
178 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
179 if (envchanged)
180 *envchanged = 1;
181 } else if (!strcmp(cmd, "--icase-pathspecs")) {
182 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
183 if (envchanged)
184 *envchanged = 1;
185 } else if (!strcmp(cmd, "--no-optional-locks")) {
186 setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
187 if (envchanged)
188 *envchanged = 1;
189 } else if (!strcmp(cmd, "--shallow-file")) {
190 (*argv)++;
191 (*argc)--;
192 set_alternate_shallow_file((*argv)[0], 1);
193 if (envchanged)
194 *envchanged = 1;
195 } else if (!strcmp(cmd, "-C")) {
196 if (*argc < 2) {
197 fprintf(stderr, _("no directory given for -C\n" ));
198 usage(git_usage_string);
199 }
200 if ((*argv)[1][0]) {
201 if (chdir((*argv)[1]))
202 die_errno("cannot change to '%s'", (*argv)[1]);
203 if (envchanged)
204 *envchanged = 1;
205 }
206 (*argv)++;
207 (*argc)--;
208 } else if (!strcmp(cmd, "--list-builtins")) {
209 list_builtins();
210 exit(0);
211 } else {
212 fprintf(stderr, _("unknown option: %s\n"), cmd);
213 usage(git_usage_string);
214 }
215 (*argv)++;
217 (*argc)--;
218 }
219 return (*argv) - orig_argv;
220}
221static int handle_alias(int *argcp, const char ***argv)
223{
224 int envchanged = 0, ret = 0, saved_errno = errno;
225 int count, option_count;
226 const char **new_argv;
227 const char *alias_command;
228 char *alias_string;
229 alias_command = (*argv)[0];
231 alias_string = alias_lookup(alias_command);
232 if (alias_string) {
233 if (alias_string[0] == '!') {
234 struct child_process child = CHILD_PROCESS_INIT;
235 int nongit_ok;
236 /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
238 setup_git_directory_gently(&nongit_ok);
239 commit_pager_choice();
241 child.use_shell = 1;
243 argv_array_push(&child.args, alias_string + 1);
244 argv_array_pushv(&child.args, (*argv) + 1);
245 ret = run_command(&child);
247 if (ret >= 0) /* normal exit */
248 exit(ret);
249 die_errno("while expanding alias '%s': '%s'",
251 alias_command, alias_string + 1);
252 }
253 count = split_cmdline(alias_string, &new_argv);
254 if (count < 0)
255 die("Bad alias.%s string: %s", alias_command,
256 split_cmdline_strerror(count));
257 option_count = handle_options(&new_argv, &count, &envchanged);
258 if (envchanged)
259 die("alias '%s' changes environment variables.\n"
260 "You can use '!git' in the alias to do this",
261 alias_command);
262 memmove(new_argv - option_count, new_argv,
263 count * sizeof(char *));
264 new_argv -= option_count;
265 if (count < 1)
267 die("empty alias for %s", alias_command);
268 if (!strcmp(alias_command, new_argv[0]))
270 die("recursive alias: %s", alias_command);
271 trace_argv_printf(new_argv,
273 "trace: alias expansion: %s =>",
274 alias_command);
275 REALLOC_ARRAY(new_argv, count + *argcp);
277 /* insert after command name */
278 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
279 *argv = new_argv;
281 *argcp += count - 1;
282 ret = 1;
284 }
285 errno = saved_errno;
287 return ret;
289}
290#define RUN_SETUP (1<<0)
292#define RUN_SETUP_GENTLY (1<<1)
293#define USE_PAGER (1<<2)
294/*
295 * require working tree to be present -- anything uses this needs
296 * RUN_SETUP for reading from the configuration file.
297 */
298#define NEED_WORK_TREE (1<<3)
299#define SUPPORT_SUPER_PREFIX (1<<4)
300#define DELAY_PAGER_CONFIG (1<<5)
301struct cmd_struct {
303 const char *cmd;
304 int (*fn)(int, const char **, const char *);
305 int option;
306};
307static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
309{
310 int status, help;
311 struct stat st;
312 const char *prefix;
313 prefix = NULL;
315 help = argc == 2 && !strcmp(argv[1], "-h");
316 if (!help) {
317 if (p->option & RUN_SETUP)
318 prefix = setup_git_directory();
319 else if (p->option & RUN_SETUP_GENTLY) {
320 int nongit_ok;
321 prefix = setup_git_directory_gently(&nongit_ok);
322 }
323 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
325 !(p->option & DELAY_PAGER_CONFIG))
326 use_pager = check_pager_config(p->cmd);
327 if (use_pager == -1 && p->option & USE_PAGER)
328 use_pager = 1;
329 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
331 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
332 trace_repo_setup(prefix);
333 }
334 commit_pager_choice();
335 if (!help && get_super_prefix()) {
337 if (!(p->option & SUPPORT_SUPER_PREFIX))
338 die("%s doesn't support --super-prefix", p->cmd);
339 }
340 if (!help && p->option & NEED_WORK_TREE)
342 setup_work_tree();
343 trace_argv_printf(argv, "trace: built-in: git");
345 status = p->fn(argc, argv, prefix);
347 if (status)
348 return status;
349 /* Somebody closed stdout? */
351 if (fstat(fileno(stdout), &st))
352 return 0;
353 /* Ignore write errors for pipes and sockets.. */
354 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
355 return 0;
356 /* Check for ENOSPC and EIO errors.. */
358 if (fflush(stdout))
359 die_errno("write failure on standard output");
360 if (ferror(stdout))
361 die("unknown write failure on standard output");
362 if (fclose(stdout))
363 die_errno("close failed on standard output");
364 return 0;
365}
366static struct cmd_struct commands[] = {
368 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
369 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
370 { "annotate", cmd_annotate, RUN_SETUP },
371 { "apply", cmd_apply, RUN_SETUP_GENTLY },
372 { "archive", cmd_archive, RUN_SETUP_GENTLY },
373 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
374 { "blame", cmd_blame, RUN_SETUP },
375 { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG },
376 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
377 { "cat-file", cmd_cat_file, RUN_SETUP },
378 { "check-attr", cmd_check_attr, RUN_SETUP },
379 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
380 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
381 { "check-ref-format", cmd_check_ref_format },
382 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
383 { "checkout-index", cmd_checkout_index,
384 RUN_SETUP | NEED_WORK_TREE},
385 { "cherry", cmd_cherry, RUN_SETUP },
386 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
387 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
388 { "clone", cmd_clone },
389 { "column", cmd_column, RUN_SETUP_GENTLY },
390 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
391 { "commit-tree", cmd_commit_tree, RUN_SETUP },
392 { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
393 { "count-objects", cmd_count_objects, RUN_SETUP },
394 { "credential", cmd_credential, RUN_SETUP_GENTLY },
395 { "describe", cmd_describe, RUN_SETUP },
396 { "diff", cmd_diff },
397 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
398 { "diff-index", cmd_diff_index, RUN_SETUP },
399 { "diff-tree", cmd_diff_tree, RUN_SETUP },
400 { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
401 { "fast-export", cmd_fast_export, RUN_SETUP },
402 { "fetch", cmd_fetch, RUN_SETUP },
403 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
404 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
405 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
406 { "format-patch", cmd_format_patch, RUN_SETUP },
407 { "fsck", cmd_fsck, RUN_SETUP },
408 { "fsck-objects", cmd_fsck, RUN_SETUP },
409 { "gc", cmd_gc, RUN_SETUP },
410 { "get-tar-commit-id", cmd_get_tar_commit_id },
411 { "grep", cmd_grep, RUN_SETUP_GENTLY },
412 { "hash-object", cmd_hash_object },
413 { "help", cmd_help },
414 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
415 { "init", cmd_init_db },
416 { "init-db", cmd_init_db },
417 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
418 { "log", cmd_log, RUN_SETUP },
419 { "ls-files", cmd_ls_files, RUN_SETUP },
420 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
421 { "ls-tree", cmd_ls_tree, RUN_SETUP },
422 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
423 { "mailsplit", cmd_mailsplit },
424 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
425 { "merge-base", cmd_merge_base, RUN_SETUP },
426 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
427 { "merge-index", cmd_merge_index, RUN_SETUP },
428 { "merge-ours", cmd_merge_ours, RUN_SETUP },
429 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
430 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
431 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
432 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
433 { "merge-tree", cmd_merge_tree, RUN_SETUP },
434 { "mktag", cmd_mktag, RUN_SETUP },
435 { "mktree", cmd_mktree, RUN_SETUP },
436 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
437 { "name-rev", cmd_name_rev, RUN_SETUP },
438 { "notes", cmd_notes, RUN_SETUP },
439 { "pack-objects", cmd_pack_objects, RUN_SETUP },
440 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
441 { "pack-refs", cmd_pack_refs, RUN_SETUP },
442 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY },
443 { "pickaxe", cmd_blame, RUN_SETUP },
444 { "prune", cmd_prune, RUN_SETUP },
445 { "prune-packed", cmd_prune_packed, RUN_SETUP },
446 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
447 { "push", cmd_push, RUN_SETUP },
448 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
449 { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
450 { "receive-pack", cmd_receive_pack },
451 { "reflog", cmd_reflog, RUN_SETUP },
452 { "remote", cmd_remote, RUN_SETUP },
453 { "remote-ext", cmd_remote_ext },
454 { "remote-fd", cmd_remote_fd },
455 { "repack", cmd_repack, RUN_SETUP },
456 { "replace", cmd_replace, RUN_SETUP },
457 { "rerere", cmd_rerere, RUN_SETUP },
458 { "reset", cmd_reset, RUN_SETUP },
459 { "rev-list", cmd_rev_list, RUN_SETUP },
460 { "rev-parse", cmd_rev_parse },
461 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
462 { "rm", cmd_rm, RUN_SETUP },
463 { "send-pack", cmd_send_pack, RUN_SETUP },
464 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
465 { "show", cmd_show, RUN_SETUP },
466 { "show-branch", cmd_show_branch, RUN_SETUP },
467 { "show-ref", cmd_show_ref, RUN_SETUP },
468 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
469 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
470 { "stripspace", cmd_stripspace },
471 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX},
472 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
473 { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG },
474 { "unpack-file", cmd_unpack_file, RUN_SETUP },
475 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
476 { "update-index", cmd_update_index, RUN_SETUP },
477 { "update-ref", cmd_update_ref, RUN_SETUP },
478 { "update-server-info", cmd_update_server_info, RUN_SETUP },
479 { "upload-archive", cmd_upload_archive },
480 { "upload-archive--writer", cmd_upload_archive_writer },
481 { "var", cmd_var, RUN_SETUP_GENTLY },
482 { "verify-commit", cmd_verify_commit, RUN_SETUP },
483 { "verify-pack", cmd_verify_pack },
484 { "verify-tag", cmd_verify_tag, RUN_SETUP },
485 { "version", cmd_version },
486 { "whatchanged", cmd_whatchanged, RUN_SETUP },
487 { "worktree", cmd_worktree, RUN_SETUP },
488 { "write-tree", cmd_write_tree, RUN_SETUP },
489};
490static struct cmd_struct *get_builtin(const char *s)
492{
493 int i;
494 for (i = 0; i < ARRAY_SIZE(commands); i++) {
495 struct cmd_struct *p = commands + i;
496 if (!strcmp(s, p->cmd))
497 return p;
498 }
499 return NULL;
500}
501int is_builtin(const char *s)
503{
504 return !!get_builtin(s);
505}
506static void list_builtins(void)
508{
509 int i;
510 for (i = 0; i < ARRAY_SIZE(commands); i++)
511 printf("%s\n", commands[i].cmd);
512}
513#ifdef STRIP_EXTENSION
515static void strip_extension(const char **argv)
516{
517 size_t len;
518 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
520 argv[0] = xmemdupz(argv[0], len);
521}
522#else
523#define strip_extension(cmd)
524#endif
525static void handle_builtin(int argc, const char **argv)
527{
528 struct argv_array args = ARGV_ARRAY_INIT;
529 const char *cmd;
530 struct cmd_struct *builtin;
531 strip_extension(argv);
533 cmd = argv[0];
534 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
536 if (argc > 1 && !strcmp(argv[1], "--help")) {
537 int i;
538 argv[1] = argv[0];
540 argv[0] = cmd = "help";
541 for (i = 0; i < argc; i++) {
543 argv_array_push(&args, argv[i]);
544 if (!i)
545 argv_array_push(&args, "--exclude-guides");
546 }
547 argc++;
549 argv = args.argv;
550 }
551 builtin = get_builtin(cmd);
553 if (builtin)
554 exit(run_builtin(builtin, argc, argv));
555 argv_array_clear(&args);
556}
557static void execv_dashed_external(const char **argv)
559{
560 struct child_process cmd = CHILD_PROCESS_INIT;
561 int status;
562 if (get_super_prefix())
564 die("%s doesn't support --super-prefix", argv[0]);
565 if (use_pager == -1 && !is_builtin(argv[0]))
567 use_pager = check_pager_config(argv[0]);
568 commit_pager_choice();
569 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
571 argv_array_pushv(&cmd.args, argv + 1);
572 cmd.clean_on_exit = 1;
573 cmd.wait_after_clean = 1;
574 cmd.silent_exec_failure = 1;
575 trace_argv_printf(cmd.args.argv, "trace: exec:");
577 /*
579 * If we fail because the command is not found, it is
580 * OK to return. Otherwise, we just pass along the status code,
581 * or our usual generic code if we were not even able to exec
582 * the program.
583 */
584 status = run_command(&cmd);
585 if (status >= 0)
586 exit(status);
587 else if (errno != ENOENT)
588 exit(128);
589}
590static int run_argv(int *argcp, const char ***argv)
592{
593 int done_alias = 0;
594 while (1) {
596 /*
597 * If we tried alias and futzed with our environment,
598 * it no longer is safe to invoke builtins directly in
599 * general. We have to spawn them as dashed externals.
600 *
601 * NEEDSWORK: if we can figure out cases
602 * where it is safe to do, we can avoid spawning a new
603 * process.
604 */
605 if (!done_alias)
606 handle_builtin(*argcp, *argv);
607 /* .. then try the external ones */
609 execv_dashed_external(*argv);
610 /* It could be an alias -- this works around the insanity
612 * of overriding "git log" with "git show" by having
613 * alias.log = show
614 */
615 if (done_alias)
616 break;
617 if (!handle_alias(argcp, argv))
618 break;
619 done_alias = 1;
620 }
621 return done_alias;
623}
624int cmd_main(int argc, const char **argv)
626{
627 const char *cmd;
628 int done_help = 0;
629 cmd = argv[0];
631 if (!cmd)
632 cmd = "git-help";
633 else {
634 const char *slash = find_last_dir_sep(cmd);
635 if (slash)
636 cmd = slash + 1;
637 }
638 trace_command_performance(argv);
640 /*
642 * "git-xxxx" is the same as "git xxxx", but we obviously:
643 *
644 * - cannot take flags in between the "git" and the "xxxx".
645 * - cannot execute it externally (since it would just do
646 * the same thing over again)
647 *
648 * So we just directly call the builtin handler, and die if
649 * that one cannot handle it.
650 */
651 if (skip_prefix(cmd, "git-", &cmd)) {
652 argv[0] = cmd;
653 handle_builtin(argc, argv);
654 die("cannot handle %s as a builtin", cmd);
655 }
656 /* Look for flags.. */
658 argv++;
659 argc--;
660 handle_options(&argv, &argc, NULL);
661 if (argc > 0) {
662 /* translate --help and --version into commands */
663 skip_prefix(argv[0], "--", &argv[0]);
664 } else {
665 /* The user didn't specify a command; give them help */
666 commit_pager_choice();
667 printf("usage: %s\n\n", git_usage_string);
668 list_common_cmds_help();
669 printf("\n%s\n", _(git_more_info_string));
670 exit(1);
671 }
672 cmd = argv[0];
673 /*
675 * We use PATH to find git commands, but we prepend some higher
676 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
677 * environment, and the $(gitexecdir) from the Makefile at build
678 * time.
679 */
680 setup_path();
681 while (1) {
683 int was_alias = run_argv(&argc, &argv);
684 if (errno != ENOENT)
685 break;
686 if (was_alias) {
687 fprintf(stderr, _("expansion of alias '%s' failed; "
688 "'%s' is not a git command\n"),
689 cmd, argv[0]);
690 exit(1);
691 }
692 if (!done_help) {
693 cmd = argv[0] = help_unknown_cmd(cmd);
694 done_help = 1;
695 } else
696 break;
697 }
698 fprintf(stderr, _("failed to run command '%s': %s\n"),
700 cmd, strerror(errno));
701 return 1;
703}