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, "--bare")) {
168 char *cwd = xgetcwd();
169 is_bare_repository_cfg = 1;
170 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
171 free(cwd);
172 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
173 if (envchanged)
174 *envchanged = 1;
175 } else if (!strcmp(cmd, "-c")) {
176 if (*argc < 2) {
177 fprintf(stderr, "-c expects a configuration string\n" );
178 usage(git_usage_string);
179 }
180 git_config_push_parameter((*argv)[1]);
181 (*argv)++;
182 (*argc)--;
183 } else if (!strcmp(cmd, "--literal-pathspecs")) {
184 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
185 if (envchanged)
186 *envchanged = 1;
187 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
188 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
189 if (envchanged)
190 *envchanged = 1;
191 } else if (!strcmp(cmd, "--glob-pathspecs")) {
192 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
193 if (envchanged)
194 *envchanged = 1;
195 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
196 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
197 if (envchanged)
198 *envchanged = 1;
199 } else if (!strcmp(cmd, "--icase-pathspecs")) {
200 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
201 if (envchanged)
202 *envchanged = 1;
203 } else if (!strcmp(cmd, "--shallow-file")) {
204 (*argv)++;
205 (*argc)--;
206 set_alternate_shallow_file((*argv)[0], 1);
207 if (envchanged)
208 *envchanged = 1;
209 } else if (!strcmp(cmd, "-C")) {
210 if (*argc < 2) {
211 fprintf(stderr, "No directory given for -C.\n" );
212 usage(git_usage_string);
213 }
214 if ((*argv)[1][0]) {
215 if (chdir((*argv)[1]))
216 die_errno("Cannot change to '%s'", (*argv)[1]);
217 if (envchanged)
218 *envchanged = 1;
219 }
220 (*argv)++;
221 (*argc)--;
222 } else {
223 fprintf(stderr, "Unknown option: %s\n", cmd);
224 usage(git_usage_string);
225 }
226 (*argv)++;
228 (*argc)--;
229 }
230 return (*argv) - orig_argv;
231}
232static int handle_alias(int *argcp, const char ***argv)
234{
235 int envchanged = 0, ret = 0, saved_errno = errno;
236 int count, option_count;
237 const char **new_argv;
238 const char *alias_command;
239 char *alias_string;
240 int unused_nongit;
241 save_env_before_alias();
243 setup_git_directory_gently(&unused_nongit);
244 alias_command = (*argv)[0];
246 alias_string = alias_lookup(alias_command);
247 if (alias_string) {
248 if (alias_string[0] == '!') {
249 struct child_process child = CHILD_PROCESS_INIT;
250 commit_pager_choice();
252 restore_env(1);
253 child.use_shell = 1;
255 argv_array_push(&child.args, alias_string + 1);
256 argv_array_pushv(&child.args, (*argv) + 1);
257 ret = run_command(&child);
259 if (ret >= 0) /* normal exit */
260 exit(ret);
261 die_errno("While expanding alias '%s': '%s'",
263 alias_command, alias_string + 1);
264 }
265 count = split_cmdline(alias_string, &new_argv);
266 if (count < 0)
267 die("Bad alias.%s string: %s", alias_command,
268 split_cmdline_strerror(count));
269 option_count = handle_options(&new_argv, &count, &envchanged);
270 if (envchanged)
271 die("alias '%s' changes environment variables\n"
272 "You can use '!git' in the alias to do this.",
273 alias_command);
274 memmove(new_argv - option_count, new_argv,
275 count * sizeof(char *));
276 new_argv -= option_count;
277 if (count < 1)
279 die("empty alias for %s", alias_command);
280 if (!strcmp(alias_command, new_argv[0]))
282 die("recursive alias: %s", alias_command);
283 trace_argv_printf(new_argv,
285 "trace: alias expansion: %s =>",
286 alias_command);
287 REALLOC_ARRAY(new_argv, count + *argcp);
289 /* insert after command name */
290 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
291 *argv = new_argv;
293 *argcp += count - 1;
294 ret = 1;
296 }
297 restore_env(0);
299 errno = saved_errno;
301 return ret;
303}
304#define RUN_SETUP (1<<0)
306#define RUN_SETUP_GENTLY (1<<1)
307#define USE_PAGER (1<<2)
308/*
309 * require working tree to be present -- anything uses this needs
310 * RUN_SETUP for reading from the configuration file.
311 */
312#define NEED_WORK_TREE (1<<3)
313struct cmd_struct {
315 const char *cmd;
316 int (*fn)(int, const char **, const char *);
317 int option;
318};
319static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
321{
322 int status, help;
323 struct stat st;
324 const char *prefix;
325 prefix = NULL;
327 help = argc == 2 && !strcmp(argv[1], "-h");
328 if (!help) {
329 if (p->option & RUN_SETUP)
330 prefix = setup_git_directory();
331 else if (p->option & RUN_SETUP_GENTLY) {
332 int nongit_ok;
333 prefix = setup_git_directory_gently(&nongit_ok);
334 }
335 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
337 use_pager = check_pager_config(p->cmd);
338 if (use_pager == -1 && p->option & USE_PAGER)
339 use_pager = 1;
340 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
342 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
343 trace_repo_setup(prefix);
344 }
345 commit_pager_choice();
346 if (!help && p->option & NEED_WORK_TREE)
348 setup_work_tree();
349 trace_argv_printf(argv, "trace: built-in: git");
351 status = p->fn(argc, argv, prefix);
353 if (status)
354 return status;
355 /* Somebody closed stdout? */
357 if (fstat(fileno(stdout), &st))
358 return 0;
359 /* Ignore write errors for pipes and sockets.. */
360 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
361 return 0;
362 /* Check for ENOSPC and EIO errors.. */
364 if (fflush(stdout))
365 die_errno("write failure on standard output");
366 if (ferror(stdout))
367 die("unknown write failure on standard output");
368 if (fclose(stdout))
369 die_errno("close failed on standard output");
370 return 0;
371}
372static struct cmd_struct commands[] = {
374 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
375 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
376 { "annotate", cmd_annotate, RUN_SETUP },
377 { "apply", cmd_apply, RUN_SETUP_GENTLY },
378 { "archive", cmd_archive },
379 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
380 { "blame", cmd_blame, RUN_SETUP },
381 { "branch", cmd_branch, RUN_SETUP },
382 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
383 { "cat-file", cmd_cat_file, RUN_SETUP },
384 { "check-attr", cmd_check_attr, RUN_SETUP },
385 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
386 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
387 { "check-ref-format", cmd_check_ref_format },
388 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
389 { "checkout-index", cmd_checkout_index,
390 RUN_SETUP | NEED_WORK_TREE},
391 { "cherry", cmd_cherry, RUN_SETUP },
392 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
393 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
394 { "clone", cmd_clone },
395 { "column", cmd_column, RUN_SETUP_GENTLY },
396 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
397 { "commit-tree", cmd_commit_tree, RUN_SETUP },
398 { "config", cmd_config, RUN_SETUP_GENTLY },
399 { "count-objects", cmd_count_objects, RUN_SETUP },
400 { "credential", cmd_credential, RUN_SETUP_GENTLY },
401 { "describe", cmd_describe, RUN_SETUP },
402 { "diff", cmd_diff },
403 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
404 { "diff-index", cmd_diff_index, RUN_SETUP },
405 { "diff-tree", cmd_diff_tree, RUN_SETUP },
406 { "fast-export", cmd_fast_export, RUN_SETUP },
407 { "fetch", cmd_fetch, RUN_SETUP },
408 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
409 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
410 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
411 { "format-patch", cmd_format_patch, RUN_SETUP },
412 { "fsck", cmd_fsck, RUN_SETUP },
413 { "fsck-objects", cmd_fsck, RUN_SETUP },
414 { "gc", cmd_gc, RUN_SETUP },
415 { "get-tar-commit-id", cmd_get_tar_commit_id },
416 { "grep", cmd_grep, RUN_SETUP_GENTLY },
417 { "hash-object", cmd_hash_object },
418 { "help", cmd_help },
419 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
420 { "init", cmd_init_db },
421 { "init-db", cmd_init_db },
422 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
423 { "log", cmd_log, RUN_SETUP },
424 { "ls-files", cmd_ls_files, RUN_SETUP },
425 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
426 { "ls-tree", cmd_ls_tree, RUN_SETUP },
427 { "mailinfo", cmd_mailinfo },
428 { "mailsplit", cmd_mailsplit },
429 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
430 { "merge-base", cmd_merge_base, RUN_SETUP },
431 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
432 { "merge-index", cmd_merge_index, RUN_SETUP },
433 { "merge-ours", cmd_merge_ours, RUN_SETUP },
434 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
435 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
436 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
437 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
438 { "merge-tree", cmd_merge_tree, RUN_SETUP },
439 { "mktag", cmd_mktag, RUN_SETUP },
440 { "mktree", cmd_mktree, RUN_SETUP },
441 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
442 { "name-rev", cmd_name_rev, RUN_SETUP },
443 { "notes", cmd_notes, RUN_SETUP },
444 { "pack-objects", cmd_pack_objects, RUN_SETUP },
445 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
446 { "pack-refs", cmd_pack_refs, RUN_SETUP },
447 { "patch-id", cmd_patch_id },
448 { "pickaxe", cmd_blame, RUN_SETUP },
449 { "prune", cmd_prune, RUN_SETUP },
450 { "prune-packed", cmd_prune_packed, RUN_SETUP },
451 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
452 { "push", cmd_push, RUN_SETUP },
453 { "read-tree", cmd_read_tree, RUN_SETUP },
454 { "receive-pack", cmd_receive_pack },
455 { "reflog", cmd_reflog, RUN_SETUP },
456 { "remote", cmd_remote, RUN_SETUP },
457 { "remote-ext", cmd_remote_ext },
458 { "remote-fd", cmd_remote_fd },
459 { "repack", cmd_repack, RUN_SETUP },
460 { "replace", cmd_replace, RUN_SETUP },
461 { "rerere", cmd_rerere, RUN_SETUP },
462 { "reset", cmd_reset, RUN_SETUP },
463 { "rev-list", cmd_rev_list, RUN_SETUP },
464 { "rev-parse", cmd_rev_parse },
465 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
466 { "rm", cmd_rm, RUN_SETUP },
467 { "send-pack", cmd_send_pack, RUN_SETUP },
468 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
469 { "show", cmd_show, RUN_SETUP },
470 { "show-branch", cmd_show_branch, RUN_SETUP },
471 { "show-ref", cmd_show_ref, RUN_SETUP },
472 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
473 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
474 { "stripspace", cmd_stripspace },
475 { "submodule--helper", cmd_submodule__helper, RUN_SETUP },
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}
510#ifdef STRIP_EXTENSION
512static void strip_extension(const char **argv)
513{
514 size_t len;
515 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
517 argv[0] = xmemdupz(argv[0], len);
518}
519#else
520#define strip_extension(cmd)
521#endif
522static void handle_builtin(int argc, const char **argv)
524{
525 const char *cmd;
526 struct cmd_struct *builtin;
527 strip_extension(argv);
529 cmd = argv[0];
530 /* Turn "git cmd --help" into "git help cmd" */
532 if (argc > 1 && !strcmp(argv[1], "--help")) {
533 argv[1] = argv[0];
534 argv[0] = cmd = "help";
535 }
536 builtin = get_builtin(cmd);
538 if (builtin)
539 exit(run_builtin(builtin, argc, argv));
540}
541static void execv_dashed_external(const char **argv)
543{
544 struct strbuf cmd = STRBUF_INIT;
545 const char *tmp;
546 int status;
547 if (use_pager == -1)
549 use_pager = check_pager_config(argv[0]);
550 commit_pager_choice();
551 strbuf_addf(&cmd, "git-%s", argv[0]);
553 /*
555 * argv[0] must be the git command, but the argv array
556 * belongs to the caller, and may be reused in
557 * subsequent loop iterations. Save argv[0] and
558 * restore it on error.
559 */
560 tmp = argv[0];
561 argv[0] = cmd.buf;
562 trace_argv_printf(argv, "trace: exec:");
564 /*
566 * if we fail because the command is not found, it is
567 * OK to return. Otherwise, we just pass along the status code.
568 */
569 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
570 if (status >= 0 || errno != ENOENT)
571 exit(status);
572 argv[0] = tmp;
574 strbuf_release(&cmd);
576}
577static int run_argv(int *argcp, const char ***argv)
579{
580 int done_alias = 0;
581 while (1) {
583 /*
584 * If we tried alias and futzed with our environment,
585 * it no longer is safe to invoke builtins directly in
586 * general. We have to spawn them as dashed externals.
587 *
588 * NEEDSWORK: if we can figure out cases
589 * where it is safe to do, we can avoid spawning a new
590 * process.
591 */
592 if (!done_alias)
593 handle_builtin(*argcp, *argv);
594 /* .. then try the external ones */
596 execv_dashed_external(*argv);
597 /* It could be an alias -- this works around the insanity
599 * of overriding "git log" with "git show" by having
600 * alias.log = show
601 */
602 if (done_alias)
603 break;
604 if (!handle_alias(argcp, argv))
605 break;
606 done_alias = 1;
607 }
608 return done_alias;
610}
611/*
613 * Many parts of Git have subprograms communicate via pipe, expect the
614 * upstream of a pipe to die with SIGPIPE when the downstream of a
615 * pipe does not need to read all that is written. Some third-party
616 * programs that ignore or block SIGPIPE for their own reason forget
617 * to restore SIGPIPE handling to the default before spawning Git and
618 * break this carefully orchestrated machinery.
619 *
620 * Restore the way SIGPIPE is handled to default, which is what we
621 * expect.
622 */
623static void restore_sigpipe_to_default(void)
624{
625 sigset_t unblock;
626 sigemptyset(&unblock);
628 sigaddset(&unblock, SIGPIPE);
629 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
630 signal(SIGPIPE, SIG_DFL);
631}
632int main(int argc, char **av)
634{
635 const char **argv = (const char **) av;
636 const char *cmd;
637 int done_help = 0;
638 cmd = git_extract_argv0_path(argv[0]);
640 if (!cmd)
641 cmd = "git-help";
642 /*
644 * Always open file descriptors 0/1/2 to avoid clobbering files
645 * in die(). It also avoids messing up when the pipes are dup'ed
646 * onto stdin/stdout/stderr in the child processes we spawn.
647 */
648 sanitize_stdfds();
649 restore_sigpipe_to_default();
651 git_setup_gettext();
653 trace_command_performance(argv);
655 /*
657 * "git-xxxx" is the same as "git xxxx", but we obviously:
658 *
659 * - cannot take flags in between the "git" and the "xxxx".
660 * - cannot execute it externally (since it would just do
661 * the same thing over again)
662 *
663 * So we just directly call the builtin handler, and die if
664 * that one cannot handle it.
665 */
666 if (skip_prefix(cmd, "git-", &cmd)) {
667 argv[0] = cmd;
668 handle_builtin(argc, argv);
669 die("cannot handle %s as a builtin", cmd);
670 }
671 /* Look for flags.. */
673 argv++;
674 argc--;
675 handle_options(&argv, &argc, NULL);
676 if (argc > 0) {
677 /* translate --help and --version into commands */
678 skip_prefix(argv[0], "--", &argv[0]);
679 } else {
680 /* The user didn't specify a command; give them help */
681 commit_pager_choice();
682 printf("usage: %s\n\n", git_usage_string);
683 list_common_cmds_help();
684 printf("\n%s\n", _(git_more_info_string));
685 exit(1);
686 }
687 cmd = argv[0];
688 /*
690 * We use PATH to find git commands, but we prepend some higher
691 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
692 * environment, and the $(gitexecdir) from the Makefile at build
693 * time.
694 */
695 setup_path();
696 while (1) {
698 int was_alias = run_argv(&argc, &argv);
699 if (errno != ENOENT)
700 break;
701 if (was_alias) {
702 fprintf(stderr, "Expansion of alias '%s' failed; "
703 "'%s' is not a git command\n",
704 cmd, argv[0]);
705 exit(1);
706 }
707 if (!done_help) {
708 cmd = argv[0] = help_unknown_cmd(cmd);
709 done_help = 1;
710 } else
711 break;
712 }
713 fprintf(stderr, "Failed to run command '%s': %s\n",
715 cmd, strerror(errno));
716 return 1;
718}