1#include "builtin.h"
2#include "exec_cmd.h"
3#include "help.h"
4#include "run-command.h"
5const char git_usage_string[] =
7 "git [--version] [--help] [-C <path>] [-c name=value]\n"
8 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
9 " [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n"
10 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
11 " <command> [<args>]";
12const char git_more_info_string[] =
14 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
15 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
16 "to read about a specific subcommand or concept.");
17static int use_pager = -1;
19static char *orig_cwd;
20static const char *env_names[] = {
21 GIT_DIR_ENVIRONMENT,
22 GIT_WORK_TREE_ENVIRONMENT,
23 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
24 GIT_PREFIX_ENVIRONMENT
25};
26static char *orig_env[4];
27static int save_restore_env_balance;
28static void save_env_before_alias(void)
30{
31 int i;
32 assert(save_restore_env_balance == 0);
34 save_restore_env_balance = 1;
35 orig_cwd = xgetcwd();
36 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
37 orig_env[i] = getenv(env_names[i]);
38 if (orig_env[i])
39 orig_env[i] = xstrdup(orig_env[i]);
40 }
41}
42static void restore_env(int external_alias)
44{
45 int i;
46 assert(save_restore_env_balance == 1);
48 save_restore_env_balance = 0;
49 if (!external_alias && orig_cwd && chdir(orig_cwd))
50 die_errno("could not move to %s", orig_cwd);
51 free(orig_cwd);
52 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
53 if (external_alias &&
54 !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
55 continue;
56 if (orig_env[i]) {
57 setenv(env_names[i], orig_env[i], 1);
58 free(orig_env[i]);
59 } else {
60 unsetenv(env_names[i]);
61 }
62 }
63}
64static void commit_pager_choice(void) {
66 switch (use_pager) {
67 case 0:
68 setenv("GIT_PAGER", "cat", 1);
69 break;
70 case 1:
71 setup_pager();
72 break;
73 default:
74 break;
75 }
76}
77static int handle_options(const char ***argv, int *argc, int *envchanged)
79{
80 const char **orig_argv = *argv;
81 while (*argc > 0) {
83 const char *cmd = (*argv)[0];
84 if (cmd[0] != '-')
85 break;
86 /*
88 * For legacy reasons, the "version" and "help"
89 * commands can be written with "--" prepended
90 * to make them look like flags.
91 */
92 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
93 break;
94 /*
96 * Check remaining flags.
97 */
98 if (skip_prefix(cmd, "--exec-path", &cmd)) {
99 if (*cmd == '=')
100 git_set_argv_exec_path(cmd + 1);
101 else {
102 puts(git_exec_path());
103 exit(0);
104 }
105 } else if (!strcmp(cmd, "--html-path")) {
106 puts(system_path(GIT_HTML_PATH));
107 exit(0);
108 } else if (!strcmp(cmd, "--man-path")) {
109 puts(system_path(GIT_MAN_PATH));
110 exit(0);
111 } else if (!strcmp(cmd, "--info-path")) {
112 puts(system_path(GIT_INFO_PATH));
113 exit(0);
114 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
115 use_pager = 1;
116 } else if (!strcmp(cmd, "--no-pager")) {
117 use_pager = 0;
118 if (envchanged)
119 *envchanged = 1;
120 } else if (!strcmp(cmd, "--no-replace-objects")) {
121 check_replace_refs = 0;
122 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
123 if (envchanged)
124 *envchanged = 1;
125 } else if (!strcmp(cmd, "--git-dir")) {
126 if (*argc < 2) {
127 fprintf(stderr, "No directory given for --git-dir.\n" );
128 usage(git_usage_string);
129 }
130 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
131 if (envchanged)
132 *envchanged = 1;
133 (*argv)++;
134 (*argc)--;
135 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
136 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
137 if (envchanged)
138 *envchanged = 1;
139 } else if (!strcmp(cmd, "--namespace")) {
140 if (*argc < 2) {
141 fprintf(stderr, "No namespace given for --namespace.\n" );
142 usage(git_usage_string);
143 }
144 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
145 if (envchanged)
146 *envchanged = 1;
147 (*argv)++;
148 (*argc)--;
149 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
150 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
151 if (envchanged)
152 *envchanged = 1;
153 } else if (!strcmp(cmd, "--work-tree")) {
154 if (*argc < 2) {
155 fprintf(stderr, "No directory given for --work-tree.\n" );
156 usage(git_usage_string);
157 }
158 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
159 if (envchanged)
160 *envchanged = 1;
161 (*argv)++;
162 (*argc)--;
163 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
164 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
165 if (envchanged)
166 *envchanged = 1;
167 } else if (!strcmp(cmd, "--super-prefix")) {
168 if (*argc < 2) {
169 fprintf(stderr, "No prefix given for --super-prefix.\n" );
170 usage(git_usage_string);
171 }
172 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
173 if (envchanged)
174 *envchanged = 1;
175 (*argv)++;
176 (*argc)--;
177 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
178 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
179 if (envchanged)
180 *envchanged = 1;
181 } else if (!strcmp(cmd, "--bare")) {
182 char *cwd = xgetcwd();
183 is_bare_repository_cfg = 1;
184 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
185 free(cwd);
186 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
187 if (envchanged)
188 *envchanged = 1;
189 } else if (!strcmp(cmd, "-c")) {
190 if (*argc < 2) {
191 fprintf(stderr, "-c expects a configuration string\n" );
192 usage(git_usage_string);
193 }
194 git_config_push_parameter((*argv)[1]);
195 (*argv)++;
196 (*argc)--;
197 } else if (!strcmp(cmd, "--literal-pathspecs")) {
198 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
199 if (envchanged)
200 *envchanged = 1;
201 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
202 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
203 if (envchanged)
204 *envchanged = 1;
205 } else if (!strcmp(cmd, "--glob-pathspecs")) {
206 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
207 if (envchanged)
208 *envchanged = 1;
209 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
210 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
211 if (envchanged)
212 *envchanged = 1;
213 } else if (!strcmp(cmd, "--icase-pathspecs")) {
214 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
215 if (envchanged)
216 *envchanged = 1;
217 } else if (!strcmp(cmd, "--shallow-file")) {
218 (*argv)++;
219 (*argc)--;
220 set_alternate_shallow_file((*argv)[0], 1);
221 if (envchanged)
222 *envchanged = 1;
223 } else if (!strcmp(cmd, "-C")) {
224 if (*argc < 2) {
225 fprintf(stderr, "No directory given for -C.\n" );
226 usage(git_usage_string);
227 }
228 if ((*argv)[1][0]) {
229 if (chdir((*argv)[1]))
230 die_errno("Cannot change to '%s'", (*argv)[1]);
231 if (envchanged)
232 *envchanged = 1;
233 }
234 (*argv)++;
235 (*argc)--;
236 } else {
237 fprintf(stderr, "Unknown option: %s\n", cmd);
238 usage(git_usage_string);
239 }
240 (*argv)++;
242 (*argc)--;
243 }
244 return (*argv) - orig_argv;
245}
246static int handle_alias(int *argcp, const char ***argv)
248{
249 int envchanged = 0, ret = 0, saved_errno = errno;
250 int count, option_count;
251 const char **new_argv;
252 const char *alias_command;
253 char *alias_string;
254 int unused_nongit;
255 save_env_before_alias();
257 setup_git_directory_gently(&unused_nongit);
258 alias_command = (*argv)[0];
260 alias_string = alias_lookup(alias_command);
261 if (alias_string) {
262 if (alias_string[0] == '!') {
263 struct child_process child = CHILD_PROCESS_INIT;
264 commit_pager_choice();
266 restore_env(1);
267 child.use_shell = 1;
269 argv_array_push(&child.args, alias_string + 1);
270 argv_array_pushv(&child.args, (*argv) + 1);
271 ret = run_command(&child);
273 if (ret >= 0) /* normal exit */
274 exit(ret);
275 die_errno("While expanding alias '%s': '%s'",
277 alias_command, alias_string + 1);
278 }
279 count = split_cmdline(alias_string, &new_argv);
280 if (count < 0)
281 die("Bad alias.%s string: %s", alias_command,
282 split_cmdline_strerror(count));
283 option_count = handle_options(&new_argv, &count, &envchanged);
284 if (envchanged)
285 die("alias '%s' changes environment variables\n"
286 "You can use '!git' in the alias to do this.",
287 alias_command);
288 memmove(new_argv - option_count, new_argv,
289 count * sizeof(char *));
290 new_argv -= option_count;
291 if (count < 1)
293 die("empty alias for %s", alias_command);
294 if (!strcmp(alias_command, new_argv[0]))
296 die("recursive alias: %s", alias_command);
297 trace_argv_printf(new_argv,
299 "trace: alias expansion: %s =>",
300 alias_command);
301 REALLOC_ARRAY(new_argv, count + *argcp);
303 /* insert after command name */
304 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
305 *argv = new_argv;
307 *argcp += count - 1;
308 ret = 1;
310 }
311 restore_env(0);
313 errno = saved_errno;
315 return ret;
317}
318#define RUN_SETUP (1<<0)
320#define RUN_SETUP_GENTLY (1<<1)
321#define USE_PAGER (1<<2)
322/*
323 * require working tree to be present -- anything uses this needs
324 * RUN_SETUP for reading from the configuration file.
325 */
326#define NEED_WORK_TREE (1<<3)
327#define SUPPORT_SUPER_PREFIX (1<<4)
328struct cmd_struct {
330 const char *cmd;
331 int (*fn)(int, const char **, const char *);
332 int option;
333};
334static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
336{
337 int status, help;
338 struct stat st;
339 const char *prefix;
340 prefix = NULL;
342 help = argc == 2 && !strcmp(argv[1], "-h");
343 if (!help) {
344 if (p->option & RUN_SETUP)
345 prefix = setup_git_directory();
346 else if (p->option & RUN_SETUP_GENTLY) {
347 int nongit_ok;
348 prefix = setup_git_directory_gently(&nongit_ok);
349 }
350 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
352 use_pager = check_pager_config(p->cmd);
353 if (use_pager == -1 && p->option & USE_PAGER)
354 use_pager = 1;
355 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
357 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
358 trace_repo_setup(prefix);
359 }
360 commit_pager_choice();
361 if (!help && get_super_prefix()) {
363 if (!(p->option & SUPPORT_SUPER_PREFIX))
364 die("%s doesn't support --super-prefix", p->cmd);
365 if (prefix)
366 die("can't use --super-prefix from a subdirectory");
367 }
368 if (!help && p->option & NEED_WORK_TREE)
370 setup_work_tree();
371 trace_argv_printf(argv, "trace: built-in: git");
373 status = p->fn(argc, argv, prefix);
375 if (status)
376 return status;
377 /* Somebody closed stdout? */
379 if (fstat(fileno(stdout), &st))
380 return 0;
381 /* Ignore write errors for pipes and sockets.. */
382 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
383 return 0;
384 /* Check for ENOSPC and EIO errors.. */
386 if (fflush(stdout))
387 die_errno("write failure on standard output");
388 if (ferror(stdout))
389 die("unknown write failure on standard output");
390 if (fclose(stdout))
391 die_errno("close failed on standard output");
392 return 0;
393}
394static struct cmd_struct commands[] = {
396 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
397 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
398 { "annotate", cmd_annotate, RUN_SETUP },
399 { "apply", cmd_apply, RUN_SETUP_GENTLY },
400 { "archive", cmd_archive },
401 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
402 { "blame", cmd_blame, RUN_SETUP },
403 { "branch", cmd_branch, RUN_SETUP },
404 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
405 { "cat-file", cmd_cat_file, RUN_SETUP },
406 { "check-attr", cmd_check_attr, RUN_SETUP },
407 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
408 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
409 { "check-ref-format", cmd_check_ref_format },
410 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
411 { "checkout-index", cmd_checkout_index,
412 RUN_SETUP | NEED_WORK_TREE},
413 { "cherry", cmd_cherry, RUN_SETUP },
414 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
415 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
416 { "clone", cmd_clone },
417 { "column", cmd_column, RUN_SETUP_GENTLY },
418 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
419 { "commit-tree", cmd_commit_tree, RUN_SETUP },
420 { "config", cmd_config, RUN_SETUP_GENTLY },
421 { "count-objects", cmd_count_objects, RUN_SETUP },
422 { "credential", cmd_credential, RUN_SETUP_GENTLY },
423 { "describe", cmd_describe, RUN_SETUP },
424 { "diff", cmd_diff },
425 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
426 { "diff-index", cmd_diff_index, RUN_SETUP },
427 { "diff-tree", cmd_diff_tree, RUN_SETUP },
428 { "fast-export", cmd_fast_export, RUN_SETUP },
429 { "fetch", cmd_fetch, RUN_SETUP },
430 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
431 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
432 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
433 { "format-patch", cmd_format_patch, RUN_SETUP },
434 { "fsck", cmd_fsck, RUN_SETUP },
435 { "fsck-objects", cmd_fsck, RUN_SETUP },
436 { "gc", cmd_gc, RUN_SETUP },
437 { "get-tar-commit-id", cmd_get_tar_commit_id },
438 { "grep", cmd_grep, RUN_SETUP_GENTLY },
439 { "hash-object", cmd_hash_object },
440 { "help", cmd_help },
441 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
442 { "init", cmd_init_db },
443 { "init-db", cmd_init_db },
444 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
445 { "log", cmd_log, RUN_SETUP },
446 { "ls-files", cmd_ls_files, RUN_SETUP },
447 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
448 { "ls-tree", cmd_ls_tree, RUN_SETUP },
449 { "mailinfo", cmd_mailinfo },
450 { "mailsplit", cmd_mailsplit },
451 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
452 { "merge-base", cmd_merge_base, RUN_SETUP },
453 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
454 { "merge-index", cmd_merge_index, RUN_SETUP },
455 { "merge-ours", cmd_merge_ours, RUN_SETUP },
456 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
457 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
458 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
459 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
460 { "merge-tree", cmd_merge_tree, RUN_SETUP },
461 { "mktag", cmd_mktag, RUN_SETUP },
462 { "mktree", cmd_mktree, RUN_SETUP },
463 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
464 { "name-rev", cmd_name_rev, RUN_SETUP },
465 { "notes", cmd_notes, RUN_SETUP },
466 { "pack-objects", cmd_pack_objects, RUN_SETUP },
467 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
468 { "pack-refs", cmd_pack_refs, RUN_SETUP },
469 { "patch-id", cmd_patch_id },
470 { "pickaxe", cmd_blame, RUN_SETUP },
471 { "prune", cmd_prune, RUN_SETUP },
472 { "prune-packed", cmd_prune_packed, RUN_SETUP },
473 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
474 { "push", cmd_push, RUN_SETUP },
475 { "read-tree", cmd_read_tree, RUN_SETUP },
476 { "receive-pack", cmd_receive_pack },
477 { "reflog", cmd_reflog, RUN_SETUP },
478 { "remote", cmd_remote, RUN_SETUP },
479 { "remote-ext", cmd_remote_ext },
480 { "remote-fd", cmd_remote_fd },
481 { "repack", cmd_repack, RUN_SETUP },
482 { "replace", cmd_replace, RUN_SETUP },
483 { "rerere", cmd_rerere, RUN_SETUP },
484 { "reset", cmd_reset, RUN_SETUP },
485 { "rev-list", cmd_rev_list, RUN_SETUP },
486 { "rev-parse", cmd_rev_parse },
487 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
488 { "rm", cmd_rm, RUN_SETUP },
489 { "send-pack", cmd_send_pack, RUN_SETUP },
490 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
491 { "show", cmd_show, RUN_SETUP },
492 { "show-branch", cmd_show_branch, RUN_SETUP },
493 { "show-ref", cmd_show_ref, RUN_SETUP },
494 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
495 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
496 { "stripspace", cmd_stripspace },
497 { "submodule--helper", cmd_submodule__helper, RUN_SETUP },
498 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
499 { "tag", cmd_tag, RUN_SETUP },
500 { "unpack-file", cmd_unpack_file, RUN_SETUP },
501 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
502 { "update-index", cmd_update_index, RUN_SETUP },
503 { "update-ref", cmd_update_ref, RUN_SETUP },
504 { "update-server-info", cmd_update_server_info, RUN_SETUP },
505 { "upload-archive", cmd_upload_archive },
506 { "upload-archive--writer", cmd_upload_archive_writer },
507 { "var", cmd_var, RUN_SETUP_GENTLY },
508 { "verify-commit", cmd_verify_commit, RUN_SETUP },
509 { "verify-pack", cmd_verify_pack },
510 { "verify-tag", cmd_verify_tag, RUN_SETUP },
511 { "version", cmd_version },
512 { "whatchanged", cmd_whatchanged, RUN_SETUP },
513 { "worktree", cmd_worktree, RUN_SETUP },
514 { "write-tree", cmd_write_tree, RUN_SETUP },
515};
516static struct cmd_struct *get_builtin(const char *s)
518{
519 int i;
520 for (i = 0; i < ARRAY_SIZE(commands); i++) {
521 struct cmd_struct *p = commands + i;
522 if (!strcmp(s, p->cmd))
523 return p;
524 }
525 return NULL;
526}
527int is_builtin(const char *s)
529{
530 return !!get_builtin(s);
531}
532#ifdef STRIP_EXTENSION
534static void strip_extension(const char **argv)
535{
536 size_t len;
537 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
539 argv[0] = xmemdupz(argv[0], len);
540}
541#else
542#define strip_extension(cmd)
543#endif
544static void handle_builtin(int argc, const char **argv)
546{
547 struct argv_array args = ARGV_ARRAY_INIT;
548 const char *cmd;
549 struct cmd_struct *builtin;
550 strip_extension(argv);
552 cmd = argv[0];
553 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
555 if (argc > 1 && !strcmp(argv[1], "--help")) {
556 int i;
557 argv[1] = argv[0];
559 argv[0] = cmd = "help";
560 for (i = 0; i < argc; i++) {
562 argv_array_push(&args, argv[i]);
563 if (!i)
564 argv_array_push(&args, "--exclude-guides");
565 }
566 argc++;
568 argv = args.argv;
569 }
570 builtin = get_builtin(cmd);
572 if (builtin)
573 exit(run_builtin(builtin, argc, argv));
574 argv_array_clear(&args);
575}
576static void execv_dashed_external(const char **argv)
578{
579 struct strbuf cmd = STRBUF_INIT;
580 const char *tmp;
581 int status;
582 if (get_super_prefix())
584 die("%s doesn't support --super-prefix", argv[0]);
585 if (use_pager == -1)
587 use_pager = check_pager_config(argv[0]);
588 commit_pager_choice();
589 strbuf_addf(&cmd, "git-%s", argv[0]);
591 /*
593 * argv[0] must be the git command, but the argv array
594 * belongs to the caller, and may be reused in
595 * subsequent loop iterations. Save argv[0] and
596 * restore it on error.
597 */
598 tmp = argv[0];
599 argv[0] = cmd.buf;
600 trace_argv_printf(argv, "trace: exec:");
602 /*
604 * if we fail because the command is not found, it is
605 * OK to return. Otherwise, we just pass along the status code.
606 */
607 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
608 if (status >= 0 || errno != ENOENT)
609 exit(status);
610 argv[0] = tmp;
612 strbuf_release(&cmd);
614}
615static int run_argv(int *argcp, const char ***argv)
617{
618 int done_alias = 0;
619 while (1) {
621 /*
622 * If we tried alias and futzed with our environment,
623 * it no longer is safe to invoke builtins directly in
624 * general. We have to spawn them as dashed externals.
625 *
626 * NEEDSWORK: if we can figure out cases
627 * where it is safe to do, we can avoid spawning a new
628 * process.
629 */
630 if (!done_alias)
631 handle_builtin(*argcp, *argv);
632 /* .. then try the external ones */
634 execv_dashed_external(*argv);
635 /* It could be an alias -- this works around the insanity
637 * of overriding "git log" with "git show" by having
638 * alias.log = show
639 */
640 if (done_alias)
641 break;
642 if (!handle_alias(argcp, argv))
643 break;
644 done_alias = 1;
645 }
646 return done_alias;
648}
649int cmd_main(int argc, const char **argv)
651{
652 const char *cmd;
653 int done_help = 0;
654 cmd = argv[0];
656 if (!cmd)
657 cmd = "git-help";
658 trace_command_performance(argv);
660 /*
662 * "git-xxxx" is the same as "git xxxx", but we obviously:
663 *
664 * - cannot take flags in between the "git" and the "xxxx".
665 * - cannot execute it externally (since it would just do
666 * the same thing over again)
667 *
668 * So we just directly call the builtin handler, and die if
669 * that one cannot handle it.
670 */
671 if (skip_prefix(cmd, "git-", &cmd)) {
672 argv[0] = cmd;
673 handle_builtin(argc, argv);
674 die("cannot handle %s as a builtin", cmd);
675 }
676 /* Look for flags.. */
678 argv++;
679 argc--;
680 handle_options(&argv, &argc, NULL);
681 if (argc > 0) {
682 /* translate --help and --version into commands */
683 skip_prefix(argv[0], "--", &argv[0]);
684 } else {
685 /* The user didn't specify a command; give them help */
686 commit_pager_choice();
687 printf("usage: %s\n\n", git_usage_string);
688 list_common_cmds_help();
689 printf("\n%s\n", _(git_more_info_string));
690 exit(1);
691 }
692 cmd = argv[0];
693 /*
695 * We use PATH to find git commands, but we prepend some higher
696 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
697 * environment, and the $(gitexecdir) from the Makefile at build
698 * time.
699 */
700 setup_path();
701 while (1) {
703 int was_alias = run_argv(&argc, &argv);
704 if (errno != ENOENT)
705 break;
706 if (was_alias) {
707 fprintf(stderr, "Expansion of alias '%s' failed; "
708 "'%s' is not a git command\n",
709 cmd, argv[0]);
710 exit(1);
711 }
712 if (!done_help) {
713 cmd = argv[0] = help_unknown_cmd(cmd);
714 done_help = 1;
715 } else
716 break;
717 }
718 fprintf(stderr, "Failed to run command '%s': %s\n",
720 cmd, strerror(errno));
721 return 1;
723}