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 saved_env_before_alias;
29static void save_env_before_alias(void)
31{
32 int i;
33 if (saved_env_before_alias)
34 return;
35 saved_env_before_alias = 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 if (!external_alias && orig_cwd && chdir(orig_cwd))
48 die_errno("could not move to %s", orig_cwd);
49 free(orig_cwd);
50 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
51 if (external_alias &&
52 !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
53 continue;
54 if (orig_env[i])
55 setenv(env_names[i], orig_env[i], 1);
56 else
57 unsetenv(env_names[i]);
58 }
59}
60static void commit_pager_choice(void) {
62 switch (use_pager) {
63 case 0:
64 setenv("GIT_PAGER", "cat", 1);
65 break;
66 case 1:
67 setup_pager();
68 break;
69 default:
70 break;
71 }
72}
73static int handle_options(const char ***argv, int *argc, int *envchanged)
75{
76 const char **orig_argv = *argv;
77 while (*argc > 0) {
79 const char *cmd = (*argv)[0];
80 if (cmd[0] != '-')
81 break;
82 /*
84 * For legacy reasons, the "version" and "help"
85 * commands can be written with "--" prepended
86 * to make them look like flags.
87 */
88 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
89 break;
90 /*
92 * Check remaining flags.
93 */
94 if (skip_prefix(cmd, "--exec-path", &cmd)) {
95 if (*cmd == '=')
96 git_set_argv_exec_path(cmd + 1);
97 else {
98 puts(git_exec_path());
99 exit(0);
100 }
101 } else if (!strcmp(cmd, "--html-path")) {
102 puts(system_path(GIT_HTML_PATH));
103 exit(0);
104 } else if (!strcmp(cmd, "--man-path")) {
105 puts(system_path(GIT_MAN_PATH));
106 exit(0);
107 } else if (!strcmp(cmd, "--info-path")) {
108 puts(system_path(GIT_INFO_PATH));
109 exit(0);
110 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
111 use_pager = 1;
112 } else if (!strcmp(cmd, "--no-pager")) {
113 use_pager = 0;
114 if (envchanged)
115 *envchanged = 1;
116 } else if (!strcmp(cmd, "--no-replace-objects")) {
117 check_replace_refs = 0;
118 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
119 if (envchanged)
120 *envchanged = 1;
121 } else if (!strcmp(cmd, "--git-dir")) {
122 if (*argc < 2) {
123 fprintf(stderr, "No directory given for --git-dir.\n" );
124 usage(git_usage_string);
125 }
126 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
127 if (envchanged)
128 *envchanged = 1;
129 (*argv)++;
130 (*argc)--;
131 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
132 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
133 if (envchanged)
134 *envchanged = 1;
135 } else if (!strcmp(cmd, "--namespace")) {
136 if (*argc < 2) {
137 fprintf(stderr, "No namespace given for --namespace.\n" );
138 usage(git_usage_string);
139 }
140 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
141 if (envchanged)
142 *envchanged = 1;
143 (*argv)++;
144 (*argc)--;
145 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
146 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
147 if (envchanged)
148 *envchanged = 1;
149 } else if (!strcmp(cmd, "--work-tree")) {
150 if (*argc < 2) {
151 fprintf(stderr, "No directory given for --work-tree.\n" );
152 usage(git_usage_string);
153 }
154 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
155 if (envchanged)
156 *envchanged = 1;
157 (*argv)++;
158 (*argc)--;
159 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
160 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
161 if (envchanged)
162 *envchanged = 1;
163 } else if (!strcmp(cmd, "--bare")) {
164 char *cwd = xgetcwd();
165 is_bare_repository_cfg = 1;
166 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
167 free(cwd);
168 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
169 if (envchanged)
170 *envchanged = 1;
171 } else if (!strcmp(cmd, "-c")) {
172 if (*argc < 2) {
173 fprintf(stderr, "-c expects a configuration string\n" );
174 usage(git_usage_string);
175 }
176 git_config_push_parameter((*argv)[1]);
177 (*argv)++;
178 (*argc)--;
179 } else if (!strcmp(cmd, "--literal-pathspecs")) {
180 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
181 if (envchanged)
182 *envchanged = 1;
183 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
184 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
185 if (envchanged)
186 *envchanged = 1;
187 } else if (!strcmp(cmd, "--glob-pathspecs")) {
188 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
189 if (envchanged)
190 *envchanged = 1;
191 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
192 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
193 if (envchanged)
194 *envchanged = 1;
195 } else if (!strcmp(cmd, "--icase-pathspecs")) {
196 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
197 if (envchanged)
198 *envchanged = 1;
199 } else if (!strcmp(cmd, "--shallow-file")) {
200 (*argv)++;
201 (*argc)--;
202 set_alternate_shallow_file((*argv)[0], 1);
203 if (envchanged)
204 *envchanged = 1;
205 } else if (!strcmp(cmd, "-C")) {
206 if (*argc < 2) {
207 fprintf(stderr, "No directory given for -C.\n" );
208 usage(git_usage_string);
209 }
210 if ((*argv)[1][0]) {
211 if (chdir((*argv)[1]))
212 die_errno("Cannot change to '%s'", (*argv)[1]);
213 if (envchanged)
214 *envchanged = 1;
215 }
216 (*argv)++;
217 (*argc)--;
218 } else {
219 fprintf(stderr, "Unknown option: %s\n", cmd);
220 usage(git_usage_string);
221 }
222 (*argv)++;
224 (*argc)--;
225 }
226 return (*argv) - orig_argv;
227}
228static int handle_alias(int *argcp, const char ***argv)
230{
231 int envchanged = 0, ret = 0, saved_errno = errno;
232 int count, option_count;
233 const char **new_argv;
234 const char *alias_command;
235 char *alias_string;
236 int unused_nongit;
237 save_env_before_alias();
239 setup_git_directory_gently(&unused_nongit);
240 alias_command = (*argv)[0];
242 alias_string = alias_lookup(alias_command);
243 if (alias_string) {
244 if (alias_string[0] == '!') {
245 const char **alias_argv;
246 int argc = *argcp, i;
247 commit_pager_choice();
249 restore_env(1);
250 /* build alias_argv */
252 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
253 alias_argv[0] = alias_string + 1;
254 for (i = 1; i < argc; ++i)
255 alias_argv[i] = (*argv)[i];
256 alias_argv[argc] = NULL;
257 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
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}
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 /*
536 * XXX: if we can figure out cases where it is _safe_
537 * to do, we can avoid spawning a new process when
538 * saved_env_before_alias is true
539 * (i.e. setup_git_dir* has been run once)
540 */
541 if (!saved_env_before_alias)
542 exit(run_builtin(builtin, argc, argv));
543 }
544}
545static void execv_dashed_external(const char **argv)
547{
548 struct strbuf cmd = STRBUF_INIT;
549 const char *tmp;
550 int status;
551 if (use_pager == -1)
553 use_pager = check_pager_config(argv[0]);
554 commit_pager_choice();
555 strbuf_addf(&cmd, "git-%s", argv[0]);
557 /*
559 * argv[0] must be the git command, but the argv array
560 * belongs to the caller, and may be reused in
561 * subsequent loop iterations. Save argv[0] and
562 * restore it on error.
563 */
564 tmp = argv[0];
565 argv[0] = cmd.buf;
566 trace_argv_printf(argv, "trace: exec:");
568 /*
570 * if we fail because the command is not found, it is
571 * OK to return. Otherwise, we just pass along the status code.
572 */
573 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
574 if (status >= 0 || errno != ENOENT)
575 exit(status);
576 argv[0] = tmp;
578 strbuf_release(&cmd);
580}
581static int run_argv(int *argcp, const char ***argv)
583{
584 int done_alias = 0;
585 while (1) {
587 /* See if it's a builtin */
588 handle_builtin(*argcp, *argv);
589 /* .. then try the external ones */
591 execv_dashed_external(*argv);
592 /* It could be an alias -- this works around the insanity
594 * of overriding "git log" with "git show" by having
595 * alias.log = show
596 */
597 if (done_alias)
598 break;
599 if (!handle_alias(argcp, argv))
600 break;
601 done_alias = 1;
602 }
603 return done_alias;
605}
606/*
608 * Many parts of Git have subprograms communicate via pipe, expect the
609 * upstream of a pipe to die with SIGPIPE when the downstream of a
610 * pipe does not need to read all that is written. Some third-party
611 * programs that ignore or block SIGPIPE for their own reason forget
612 * to restore SIGPIPE handling to the default before spawning Git and
613 * break this carefully orchestrated machinery.
614 *
615 * Restore the way SIGPIPE is handled to default, which is what we
616 * expect.
617 */
618static void restore_sigpipe_to_default(void)
619{
620 sigset_t unblock;
621 sigemptyset(&unblock);
623 sigaddset(&unblock, SIGPIPE);
624 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
625 signal(SIGPIPE, SIG_DFL);
626}
627int main(int argc, char **av)
629{
630 const char **argv = (const char **) av;
631 const char *cmd;
632 int done_help = 0;
633 startup_info = &git_startup_info;
635 cmd = git_extract_argv0_path(argv[0]);
637 if (!cmd)
638 cmd = "git-help";
639 /*
641 * Always open file descriptors 0/1/2 to avoid clobbering files
642 * in die(). It also avoids messing up when the pipes are dup'ed
643 * onto stdin/stdout/stderr in the child processes we spawn.
644 */
645 sanitize_stdfds();
646 restore_sigpipe_to_default();
648 git_setup_gettext();
650 trace_command_performance(argv);
652 /*
654 * "git-xxxx" is the same as "git xxxx", but we obviously:
655 *
656 * - cannot take flags in between the "git" and the "xxxx".
657 * - cannot execute it externally (since it would just do
658 * the same thing over again)
659 *
660 * So we just directly call the builtin handler, and die if
661 * that one cannot handle it.
662 */
663 if (skip_prefix(cmd, "git-", &cmd)) {
664 argv[0] = cmd;
665 handle_builtin(argc, argv);
666 die("cannot handle %s as a builtin", cmd);
667 }
668 /* Look for flags.. */
670 argv++;
671 argc--;
672 handle_options(&argv, &argc, NULL);
673 if (argc > 0) {
674 /* translate --help and --version into commands */
675 skip_prefix(argv[0], "--", &argv[0]);
676 } else {
677 /* The user didn't specify a command; give them help */
678 commit_pager_choice();
679 printf("usage: %s\n\n", git_usage_string);
680 list_common_cmds_help();
681 printf("\n%s\n", _(git_more_info_string));
682 exit(1);
683 }
684 cmd = argv[0];
685 /*
687 * We use PATH to find git commands, but we prepend some higher
688 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
689 * environment, and the $(gitexecdir) from the Makefile at build
690 * time.
691 */
692 setup_path();
693 while (1) {
695 int was_alias = run_argv(&argc, &argv);
696 if (errno != ENOENT)
697 break;
698 if (was_alias) {
699 fprintf(stderr, "Expansion of alias '%s' failed; "
700 "'%s' is not a git command\n",
701 cmd, argv[0]);
702 exit(1);
703 }
704 if (!done_help) {
705 cmd = argv[0] = help_unknown_cmd(cmd);
706 done_help = 1;
707 } else
708 break;
709 }
710 fprintf(stderr, "Failed to run command '%s': %s\n",
712 cmd, strerror(errno));
713 return 1;
715}