1cbe2676f542d01561e1852413ec1313acbacaf6
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 struct startup_info git_startup_info;
19static int use_pager = -1;
20static char *orig_cwd;
21static const char *env_names[] = {
22 GIT_DIR_ENVIRONMENT,
23 GIT_WORK_TREE_ENVIRONMENT,
24 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
25 GIT_PREFIX_ENVIRONMENT
26};
27static char *orig_env[4];
28static int save_restore_env_balance;
29static void save_env_before_alias(void)
31{
32 int i;
33 assert(save_restore_env_balance == 0);
35 save_restore_env_balance = 1;
36 orig_cwd = xgetcwd();
37 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
38 orig_env[i] = getenv(env_names[i]);
39 if (orig_env[i])
40 orig_env[i] = xstrdup(orig_env[i]);
41 }
42}
43static void restore_env(int external_alias)
45{
46 int i;
47 assert(save_restore_env_balance == 1);
49 save_restore_env_balance = 0;
50 if (!external_alias && orig_cwd && chdir(orig_cwd))
51 die_errno("could not move to %s", orig_cwd);
52 free(orig_cwd);
53 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
54 if (external_alias &&
55 !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
56 continue;
57 if (orig_env[i])
58 setenv(env_names[i], orig_env[i], 1);
59 else
60 unsetenv(env_names[i]);
61 }
62}
63static void commit_pager_choice(void) {
65 switch (use_pager) {
66 case 0:
67 setenv("GIT_PAGER", "cat", 1);
68 break;
69 case 1:
70 setup_pager();
71 break;
72 default:
73 break;
74 }
75}
76static int handle_options(const char ***argv, int *argc, int *envchanged)
78{
79 const char **orig_argv = *argv;
80 while (*argc > 0) {
82 const char *cmd = (*argv)[0];
83 if (cmd[0] != '-')
84 break;
85 /*
87 * For legacy reasons, the "version" and "help"
88 * commands can be written with "--" prepended
89 * to make them look like flags.
90 */
91 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
92 break;
93 /*
95 * Check remaining flags.
96 */
97 if (skip_prefix(cmd, "--exec-path", &cmd)) {
98 if (*cmd == '=')
99 git_set_argv_exec_path(cmd + 1);
100 else {
101 puts(git_exec_path());
102 exit(0);
103 }
104 } else if (!strcmp(cmd, "--html-path")) {
105 puts(system_path(GIT_HTML_PATH));
106 exit(0);
107 } else if (!strcmp(cmd, "--man-path")) {
108 puts(system_path(GIT_MAN_PATH));
109 exit(0);
110 } else if (!strcmp(cmd, "--info-path")) {
111 puts(system_path(GIT_INFO_PATH));
112 exit(0);
113 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
114 use_pager = 1;
115 } else if (!strcmp(cmd, "--no-pager")) {
116 use_pager = 0;
117 if (envchanged)
118 *envchanged = 1;
119 } else if (!strcmp(cmd, "--no-replace-objects")) {
120 check_replace_refs = 0;
121 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
122 if (envchanged)
123 *envchanged = 1;
124 } else if (!strcmp(cmd, "--git-dir")) {
125 if (*argc < 2) {
126 fprintf(stderr, "No directory given for --git-dir.\n" );
127 usage(git_usage_string);
128 }
129 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
130 if (envchanged)
131 *envchanged = 1;
132 (*argv)++;
133 (*argc)--;
134 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
135 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
136 if (envchanged)
137 *envchanged = 1;
138 } else if (!strcmp(cmd, "--namespace")) {
139 if (*argc < 2) {
140 fprintf(stderr, "No namespace given for --namespace.\n" );
141 usage(git_usage_string);
142 }
143 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
144 if (envchanged)
145 *envchanged = 1;
146 (*argv)++;
147 (*argc)--;
148 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
149 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
150 if (envchanged)
151 *envchanged = 1;
152 } else if (!strcmp(cmd, "--work-tree")) {
153 if (*argc < 2) {
154 fprintf(stderr, "No directory given for --work-tree.\n" );
155 usage(git_usage_string);
156 }
157 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
158 if (envchanged)
159 *envchanged = 1;
160 (*argv)++;
161 (*argc)--;
162 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
163 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
164 if (envchanged)
165 *envchanged = 1;
166 } else if (!strcmp(cmd, "--bare")) {
167 char *cwd = xgetcwd();
168 is_bare_repository_cfg = 1;
169 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
170 free(cwd);
171 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
172 if (envchanged)
173 *envchanged = 1;
174 } else if (!strcmp(cmd, "-c")) {
175 if (*argc < 2) {
176 fprintf(stderr, "-c expects a configuration string\n" );
177 usage(git_usage_string);
178 }
179 git_config_push_parameter((*argv)[1]);
180 (*argv)++;
181 (*argc)--;
182 } else if (!strcmp(cmd, "--literal-pathspecs")) {
183 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
184 if (envchanged)
185 *envchanged = 1;
186 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
187 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
188 if (envchanged)
189 *envchanged = 1;
190 } else if (!strcmp(cmd, "--glob-pathspecs")) {
191 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
192 if (envchanged)
193 *envchanged = 1;
194 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
195 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
196 if (envchanged)
197 *envchanged = 1;
198 } else if (!strcmp(cmd, "--icase-pathspecs")) {
199 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
200 if (envchanged)
201 *envchanged = 1;
202 } else if (!strcmp(cmd, "--shallow-file")) {
203 (*argv)++;
204 (*argc)--;
205 set_alternate_shallow_file((*argv)[0], 1);
206 if (envchanged)
207 *envchanged = 1;
208 } else if (!strcmp(cmd, "-C")) {
209 if (*argc < 2) {
210 fprintf(stderr, "No directory given for -C.\n" );
211 usage(git_usage_string);
212 }
213 if ((*argv)[1][0]) {
214 if (chdir((*argv)[1]))
215 die_errno("Cannot change to '%s'", (*argv)[1]);
216 if (envchanged)
217 *envchanged = 1;
218 }
219 (*argv)++;
220 (*argc)--;
221 } else {
222 fprintf(stderr, "Unknown option: %s\n", cmd);
223 usage(git_usage_string);
224 }
225 (*argv)++;
227 (*argc)--;
228 }
229 return (*argv) - orig_argv;
230}
231static int handle_alias(int *argcp, const char ***argv)
233{
234 int envchanged = 0, ret = 0, saved_errno = errno;
235 int count, option_count;
236 const char **new_argv;
237 const char *alias_command;
238 char *alias_string;
239 int unused_nongit;
240 save_env_before_alias();
242 setup_git_directory_gently(&unused_nongit);
243 alias_command = (*argv)[0];
245 alias_string = alias_lookup(alias_command);
246 if (alias_string) {
247 if (alias_string[0] == '!') {
248 const char **alias_argv;
249 int argc = *argcp, i;
250 commit_pager_choice();
252 restore_env(1);
253 /* build alias_argv */
255 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
256 alias_argv[0] = alias_string + 1;
257 for (i = 1; i < argc; ++i)
258 alias_argv[i] = (*argv)[i];
259 alias_argv[argc] = NULL;
260 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
262 if (ret >= 0) /* normal exit */
263 exit(ret);
264 die_errno("While expanding alias '%s': '%s'",
266 alias_command, alias_string + 1);
267 }
268 count = split_cmdline(alias_string, &new_argv);
269 if (count < 0)
270 die("Bad alias.%s string: %s", alias_command,
271 split_cmdline_strerror(count));
272 option_count = handle_options(&new_argv, &count, &envchanged);
273 if (envchanged)
274 die("alias '%s' changes environment variables\n"
275 "You can use '!git' in the alias to do this.",
276 alias_command);
277 memmove(new_argv - option_count, new_argv,
278 count * sizeof(char *));
279 new_argv -= option_count;
280 if (count < 1)
282 die("empty alias for %s", alias_command);
283 if (!strcmp(alias_command, new_argv[0]))
285 die("recursive alias: %s", alias_command);
286 trace_argv_printf(new_argv,
288 "trace: alias expansion: %s =>",
289 alias_command);
290 REALLOC_ARRAY(new_argv, count + *argcp);
292 /* insert after command name */
293 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
294 *argv = new_argv;
296 *argcp += count - 1;
297 ret = 1;
299 }
300 restore_env(0);
302 errno = saved_errno;
304 return ret;
306}
307#define RUN_SETUP (1<<0)
309#define RUN_SETUP_GENTLY (1<<1)
310#define USE_PAGER (1<<2)
311/*
312 * require working tree to be present -- anything uses this needs
313 * RUN_SETUP for reading from the configuration file.
314 */
315#define NEED_WORK_TREE (1<<3)
316struct cmd_struct {
318 const char *cmd;
319 int (*fn)(int, const char **, const char *);
320 int option;
321};
322static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
324{
325 int status, help;
326 struct stat st;
327 const char *prefix;
328 prefix = NULL;
330 help = argc == 2 && !strcmp(argv[1], "-h");
331 if (!help) {
332 if (p->option & RUN_SETUP)
333 prefix = setup_git_directory();
334 else if (p->option & RUN_SETUP_GENTLY) {
335 int nongit_ok;
336 prefix = setup_git_directory_gently(&nongit_ok);
337 }
338 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
340 use_pager = check_pager_config(p->cmd);
341 if (use_pager == -1 && p->option & USE_PAGER)
342 use_pager = 1;
343 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
345 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
346 trace_repo_setup(prefix);
347 }
348 commit_pager_choice();
349 if (!help && p->option & NEED_WORK_TREE)
351 setup_work_tree();
352 trace_argv_printf(argv, "trace: built-in: git");
354 status = p->fn(argc, argv, prefix);
356 if (status)
357 return status;
358 /* Somebody closed stdout? */
360 if (fstat(fileno(stdout), &st))
361 return 0;
362 /* Ignore write errors for pipes and sockets.. */
363 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
364 return 0;
365 /* Check for ENOSPC and EIO errors.. */
367 if (fflush(stdout))
368 die_errno("write failure on standard output");
369 if (ferror(stdout))
370 die("unknown write failure on standard output");
371 if (fclose(stdout))
372 die_errno("close failed on standard output");
373 return 0;
374}
375static struct cmd_struct commands[] = {
377 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
378 { "annotate", cmd_annotate, RUN_SETUP },
379 { "apply", cmd_apply, RUN_SETUP_GENTLY },
380 { "archive", cmd_archive },
381 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
382 { "blame", cmd_blame, RUN_SETUP },
383 { "branch", cmd_branch, RUN_SETUP },
384 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
385 { "cat-file", cmd_cat_file, RUN_SETUP },
386 { "check-attr", cmd_check_attr, RUN_SETUP },
387 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
388 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
389 { "check-ref-format", cmd_check_ref_format },
390 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
391 { "checkout-index", cmd_checkout_index,
392 RUN_SETUP | NEED_WORK_TREE},
393 { "cherry", cmd_cherry, RUN_SETUP },
394 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
395 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
396 { "clone", cmd_clone },
397 { "column", cmd_column, RUN_SETUP_GENTLY },
398 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
399 { "commit-tree", cmd_commit_tree, RUN_SETUP },
400 { "config", cmd_config, RUN_SETUP_GENTLY },
401 { "count-objects", cmd_count_objects, RUN_SETUP },
402 { "credential", cmd_credential, RUN_SETUP_GENTLY },
403 { "describe", cmd_describe, RUN_SETUP },
404 { "diff", cmd_diff },
405 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
406 { "diff-index", cmd_diff_index, RUN_SETUP },
407 { "diff-tree", cmd_diff_tree, RUN_SETUP },
408 { "fast-export", cmd_fast_export, RUN_SETUP },
409 { "fetch", cmd_fetch, RUN_SETUP },
410 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
411 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
412 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
413 { "format-patch", cmd_format_patch, RUN_SETUP },
414 { "fsck", cmd_fsck, RUN_SETUP },
415 { "fsck-objects", cmd_fsck, RUN_SETUP },
416 { "gc", cmd_gc, RUN_SETUP },
417 { "get-tar-commit-id", cmd_get_tar_commit_id },
418 { "grep", cmd_grep, RUN_SETUP_GENTLY },
419 { "hash-object", cmd_hash_object },
420 { "help", cmd_help },
421 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
422 { "init", cmd_init_db },
423 { "init-db", cmd_init_db },
424 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP },
425 { "log", cmd_log, RUN_SETUP },
426 { "ls-files", cmd_ls_files, RUN_SETUP },
427 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
428 { "ls-tree", cmd_ls_tree, RUN_SETUP },
429 { "mailinfo", cmd_mailinfo },
430 { "mailsplit", cmd_mailsplit },
431 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
432 { "merge-base", cmd_merge_base, RUN_SETUP },
433 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
434 { "merge-index", cmd_merge_index, RUN_SETUP },
435 { "merge-ours", cmd_merge_ours, RUN_SETUP },
436 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
437 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
438 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
439 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
440 { "merge-tree", cmd_merge_tree, RUN_SETUP },
441 { "mktag", cmd_mktag, RUN_SETUP },
442 { "mktree", cmd_mktree, RUN_SETUP },
443 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
444 { "name-rev", cmd_name_rev, RUN_SETUP },
445 { "notes", cmd_notes, RUN_SETUP },
446 { "pack-objects", cmd_pack_objects, RUN_SETUP },
447 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
448 { "pack-refs", cmd_pack_refs, RUN_SETUP },
449 { "patch-id", cmd_patch_id },
450 { "pickaxe", cmd_blame, RUN_SETUP },
451 { "prune", cmd_prune, RUN_SETUP },
452 { "prune-packed", cmd_prune_packed, RUN_SETUP },
453 { "push", cmd_push, RUN_SETUP },
454 { "read-tree", cmd_read_tree, RUN_SETUP },
455 { "receive-pack", cmd_receive_pack },
456 { "reflog", cmd_reflog, RUN_SETUP },
457 { "remote", cmd_remote, RUN_SETUP },
458 { "remote-ext", cmd_remote_ext },
459 { "remote-fd", cmd_remote_fd },
460 { "repack", cmd_repack, RUN_SETUP },
461 { "replace", cmd_replace, RUN_SETUP },
462 { "rerere", cmd_rerere, RUN_SETUP },
463 { "reset", cmd_reset, RUN_SETUP },
464 { "rev-list", cmd_rev_list, RUN_SETUP },
465 { "rev-parse", cmd_rev_parse },
466 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
467 { "rm", cmd_rm, RUN_SETUP },
468 { "send-pack", cmd_send_pack, RUN_SETUP },
469 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
470 { "show", cmd_show, RUN_SETUP },
471 { "show-branch", cmd_show_branch, RUN_SETUP },
472 { "show-ref", cmd_show_ref, RUN_SETUP },
473 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
474 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
475 { "stripspace", cmd_stripspace },
476 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
477 { "tag", cmd_tag, RUN_SETUP },
478 { "unpack-file", cmd_unpack_file, RUN_SETUP },
479 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
480 { "update-index", cmd_update_index, RUN_SETUP },
481 { "update-ref", cmd_update_ref, RUN_SETUP },
482 { "update-server-info", cmd_update_server_info, RUN_SETUP },
483 { "upload-archive", cmd_upload_archive },
484 { "upload-archive--writer", cmd_upload_archive_writer },
485 { "var", cmd_var, RUN_SETUP_GENTLY },
486 { "verify-commit", cmd_verify_commit, RUN_SETUP },
487 { "verify-pack", cmd_verify_pack },
488 { "verify-tag", cmd_verify_tag, RUN_SETUP },
489 { "version", cmd_version },
490 { "whatchanged", cmd_whatchanged, RUN_SETUP },
491 { "worktree", cmd_worktree, RUN_SETUP },
492 { "write-tree", cmd_write_tree, RUN_SETUP },
493};
494static struct cmd_struct *get_builtin(const char *s)
496{
497 int i;
498 for (i = 0; i < ARRAY_SIZE(commands); i++) {
499 struct cmd_struct *p = commands + i;
500 if (!strcmp(s, p->cmd))
501 return p;
502 }
503 return NULL;
504}
505int is_builtin(const char *s)
507{
508 return !!get_builtin(s);
509}
510static void handle_builtin(int argc, const char **argv)
512{
513 const char *cmd = argv[0];
514 int i;
515 static const char ext[] = STRIP_EXTENSION;
516 struct cmd_struct *builtin;
517 if (sizeof(ext) > 1) {
519 i = strlen(argv[0]) - strlen(ext);
520 if (i > 0 && !strcmp(argv[0] + i, ext)) {
521 char *argv0 = xstrdup(argv[0]);
522 argv[0] = cmd = argv0;
523 argv0[i] = '\0';
524 }
525 }
526 /* Turn "git cmd --help" into "git help cmd" */
528 if (argc > 1 && !strcmp(argv[1], "--help")) {
529 argv[1] = argv[0];
530 argv[0] = cmd = "help";
531 }
532 builtin = get_builtin(cmd);
534 if (builtin)
535 exit(run_builtin(builtin, argc, argv));
536}
537static void execv_dashed_external(const char **argv)
539{
540 struct strbuf cmd = STRBUF_INIT;
541 const char *tmp;
542 int status;
543 if (use_pager == -1)
545 use_pager = check_pager_config(argv[0]);
546 commit_pager_choice();
547 strbuf_addf(&cmd, "git-%s", argv[0]);
549 /*
551 * argv[0] must be the git command, but the argv array
552 * belongs to the caller, and may be reused in
553 * subsequent loop iterations. Save argv[0] and
554 * restore it on error.
555 */
556 tmp = argv[0];
557 argv[0] = cmd.buf;
558 trace_argv_printf(argv, "trace: exec:");
560 /*
562 * if we fail because the command is not found, it is
563 * OK to return. Otherwise, we just pass along the status code.
564 */
565 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
566 if (status >= 0 || errno != ENOENT)
567 exit(status);
568 argv[0] = tmp;
570 strbuf_release(&cmd);
572}
573static int run_argv(int *argcp, const char ***argv)
575{
576 int done_alias = 0;
577 while (1) {
579 /*
580 * If we tried alias and futzed with our environment,
581 * it no longer is safe to invoke builtins directly in
582 * general. We have to spawn them as dashed externals.
583 *
584 * NEEDSWORK: if we can figure out cases
585 * where it is safe to do, we can avoid spawning a new
586 * process.
587 */
588 if (!done_alias)
589 handle_builtin(*argcp, *argv);
590 /* .. then try the external ones */
592 execv_dashed_external(*argv);
593 /* It could be an alias -- this works around the insanity
595 * of overriding "git log" with "git show" by having
596 * alias.log = show
597 */
598 if (done_alias)
599 break;
600 if (!handle_alias(argcp, argv))
601 break;
602 done_alias = 1;
603 }
604 return done_alias;
606}
607/*
609 * Many parts of Git have subprograms communicate via pipe, expect the
610 * upstream of a pipe to die with SIGPIPE when the downstream of a
611 * pipe does not need to read all that is written. Some third-party
612 * programs that ignore or block SIGPIPE for their own reason forget
613 * to restore SIGPIPE handling to the default before spawning Git and
614 * break this carefully orchestrated machinery.
615 *
616 * Restore the way SIGPIPE is handled to default, which is what we
617 * expect.
618 */
619static void restore_sigpipe_to_default(void)
620{
621 sigset_t unblock;
622 sigemptyset(&unblock);
624 sigaddset(&unblock, SIGPIPE);
625 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
626 signal(SIGPIPE, SIG_DFL);
627}
628int main(int argc, char **av)
630{
631 const char **argv = (const char **) av;
632 const char *cmd;
633 int done_help = 0;
634 startup_info = &git_startup_info;
636 cmd = git_extract_argv0_path(argv[0]);
638 if (!cmd)
639 cmd = "git-help";
640 /*
642 * Always open file descriptors 0/1/2 to avoid clobbering files
643 * in die(). It also avoids messing up when the pipes are dup'ed
644 * onto stdin/stdout/stderr in the child processes we spawn.
645 */
646 sanitize_stdfds();
647 restore_sigpipe_to_default();
649 git_setup_gettext();
651 trace_command_performance(argv);
653 /*
655 * "git-xxxx" is the same as "git xxxx", but we obviously:
656 *
657 * - cannot take flags in between the "git" and the "xxxx".
658 * - cannot execute it externally (since it would just do
659 * the same thing over again)
660 *
661 * So we just directly call the builtin handler, and die if
662 * that one cannot handle it.
663 */
664 if (skip_prefix(cmd, "git-", &cmd)) {
665 argv[0] = cmd;
666 handle_builtin(argc, argv);
667 die("cannot handle %s as a builtin", cmd);
668 }
669 /* Look for flags.. */
671 argv++;
672 argc--;
673 handle_options(&argv, &argc, NULL);
674 if (argc > 0) {
675 /* translate --help and --version into commands */
676 skip_prefix(argv[0], "--", &argv[0]);
677 } else {
678 /* The user didn't specify a command; give them help */
679 commit_pager_choice();
680 printf("usage: %s\n\n", git_usage_string);
681 list_common_cmds_help();
682 printf("\n%s\n", _(git_more_info_string));
683 exit(1);
684 }
685 cmd = argv[0];
686 /*
688 * We use PATH to find git commands, but we prepend some higher
689 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
690 * environment, and the $(gitexecdir) from the Makefile at build
691 * time.
692 */
693 setup_path();
694 while (1) {
696 int was_alias = run_argv(&argc, &argv);
697 if (errno != ENOENT)
698 break;
699 if (was_alias) {
700 fprintf(stderr, "Expansion of alias '%s' failed; "
701 "'%s' is not a git command\n",
702 cmd, argv[0]);
703 exit(1);
704 }
705 if (!done_help) {
706 cmd = argv[0] = help_unknown_cmd(cmd);
707 done_help = 1;
708 } else
709 break;
710 }
711 fprintf(stderr, "Failed to run command '%s': %s\n",
713 cmd, strerror(errno));
714 return 1;
716}