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 free(orig_env[i]);
60 } else {
61 unsetenv(env_names[i]);
62 }
63 }
64}
65static void commit_pager_choice(void) {
67 switch (use_pager) {
68 case 0:
69 setenv("GIT_PAGER", "cat", 1);
70 break;
71 case 1:
72 setup_pager();
73 break;
74 default:
75 break;
76 }
77}
78static int handle_options(const char ***argv, int *argc, int *envchanged)
80{
81 const char **orig_argv = *argv;
82 while (*argc > 0) {
84 const char *cmd = (*argv)[0];
85 if (cmd[0] != '-')
86 break;
87 /*
89 * For legacy reasons, the "version" and "help"
90 * commands can be written with "--" prepended
91 * to make them look like flags.
92 */
93 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
94 break;
95 /*
97 * Check remaining flags.
98 */
99 if (skip_prefix(cmd, "--exec-path", &cmd)) {
100 if (*cmd == '=')
101 git_set_argv_exec_path(cmd + 1);
102 else {
103 puts(git_exec_path());
104 exit(0);
105 }
106 } else if (!strcmp(cmd, "--html-path")) {
107 puts(system_path(GIT_HTML_PATH));
108 exit(0);
109 } else if (!strcmp(cmd, "--man-path")) {
110 puts(system_path(GIT_MAN_PATH));
111 exit(0);
112 } else if (!strcmp(cmd, "--info-path")) {
113 puts(system_path(GIT_INFO_PATH));
114 exit(0);
115 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
116 use_pager = 1;
117 } else if (!strcmp(cmd, "--no-pager")) {
118 use_pager = 0;
119 if (envchanged)
120 *envchanged = 1;
121 } else if (!strcmp(cmd, "--no-replace-objects")) {
122 check_replace_refs = 0;
123 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
124 if (envchanged)
125 *envchanged = 1;
126 } else if (!strcmp(cmd, "--git-dir")) {
127 if (*argc < 2) {
128 fprintf(stderr, "No directory given for --git-dir.\n" );
129 usage(git_usage_string);
130 }
131 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
132 if (envchanged)
133 *envchanged = 1;
134 (*argv)++;
135 (*argc)--;
136 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
137 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
138 if (envchanged)
139 *envchanged = 1;
140 } else if (!strcmp(cmd, "--namespace")) {
141 if (*argc < 2) {
142 fprintf(stderr, "No namespace given for --namespace.\n" );
143 usage(git_usage_string);
144 }
145 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
146 if (envchanged)
147 *envchanged = 1;
148 (*argv)++;
149 (*argc)--;
150 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
151 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
152 if (envchanged)
153 *envchanged = 1;
154 } else if (!strcmp(cmd, "--work-tree")) {
155 if (*argc < 2) {
156 fprintf(stderr, "No directory given for --work-tree.\n" );
157 usage(git_usage_string);
158 }
159 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
160 if (envchanged)
161 *envchanged = 1;
162 (*argv)++;
163 (*argc)--;
164 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
165 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
166 if (envchanged)
167 *envchanged = 1;
168 } else if (!strcmp(cmd, "--bare")) {
169 char *cwd = xgetcwd();
170 is_bare_repository_cfg = 1;
171 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
172 free(cwd);
173 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
174 if (envchanged)
175 *envchanged = 1;
176 } else if (!strcmp(cmd, "-c")) {
177 if (*argc < 2) {
178 fprintf(stderr, "-c expects a configuration string\n" );
179 usage(git_usage_string);
180 }
181 git_config_push_parameter((*argv)[1]);
182 (*argv)++;
183 (*argc)--;
184 } else if (!strcmp(cmd, "--literal-pathspecs")) {
185 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
186 if (envchanged)
187 *envchanged = 1;
188 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
189 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
190 if (envchanged)
191 *envchanged = 1;
192 } else if (!strcmp(cmd, "--glob-pathspecs")) {
193 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
194 if (envchanged)
195 *envchanged = 1;
196 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
197 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
198 if (envchanged)
199 *envchanged = 1;
200 } else if (!strcmp(cmd, "--icase-pathspecs")) {
201 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
202 if (envchanged)
203 *envchanged = 1;
204 } else if (!strcmp(cmd, "--shallow-file")) {
205 (*argv)++;
206 (*argc)--;
207 set_alternate_shallow_file((*argv)[0], 1);
208 if (envchanged)
209 *envchanged = 1;
210 } else if (!strcmp(cmd, "-C")) {
211 if (*argc < 2) {
212 fprintf(stderr, "No directory given for -C.\n" );
213 usage(git_usage_string);
214 }
215 if ((*argv)[1][0]) {
216 if (chdir((*argv)[1]))
217 die_errno("Cannot change to '%s'", (*argv)[1]);
218 if (envchanged)
219 *envchanged = 1;
220 }
221 (*argv)++;
222 (*argc)--;
223 } else {
224 fprintf(stderr, "Unknown option: %s\n", cmd);
225 usage(git_usage_string);
226 }
227 (*argv)++;
229 (*argc)--;
230 }
231 return (*argv) - orig_argv;
232}
233static int handle_alias(int *argcp, const char ***argv)
235{
236 int envchanged = 0, ret = 0, saved_errno = errno;
237 int count, option_count;
238 const char **new_argv;
239 const char *alias_command;
240 char *alias_string;
241 int unused_nongit;
242 save_env_before_alias();
244 setup_git_directory_gently(&unused_nongit);
245 alias_command = (*argv)[0];
247 alias_string = alias_lookup(alias_command);
248 if (alias_string) {
249 if (alias_string[0] == '!') {
250 const char **alias_argv;
251 int argc = *argcp, i;
252 commit_pager_choice();
254 restore_env(1);
255 /* build alias_argv */
257 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
258 alias_argv[0] = alias_string + 1;
259 for (i = 1; i < argc; ++i)
260 alias_argv[i] = (*argv)[i];
261 alias_argv[argc] = NULL;
262 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
264 if (ret >= 0) /* normal exit */
265 exit(ret);
266 die_errno("While expanding alias '%s': '%s'",
268 alias_command, alias_string + 1);
269 }
270 count = split_cmdline(alias_string, &new_argv);
271 if (count < 0)
272 die("Bad alias.%s string: %s", alias_command,
273 split_cmdline_strerror(count));
274 option_count = handle_options(&new_argv, &count, &envchanged);
275 if (envchanged)
276 die("alias '%s' changes environment variables\n"
277 "You can use '!git' in the alias to do this.",
278 alias_command);
279 memmove(new_argv - option_count, new_argv,
280 count * sizeof(char *));
281 new_argv -= option_count;
282 if (count < 1)
284 die("empty alias for %s", alias_command);
285 if (!strcmp(alias_command, new_argv[0]))
287 die("recursive alias: %s", alias_command);
288 trace_argv_printf(new_argv,
290 "trace: alias expansion: %s =>",
291 alias_command);
292 REALLOC_ARRAY(new_argv, count + *argcp);
294 /* insert after command name */
295 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
296 *argv = new_argv;
298 *argcp += count - 1;
299 ret = 1;
301 }
302 restore_env(0);
304 errno = saved_errno;
306 return ret;
308}
309#define RUN_SETUP (1<<0)
311#define RUN_SETUP_GENTLY (1<<1)
312#define USE_PAGER (1<<2)
313/*
314 * require working tree to be present -- anything uses this needs
315 * RUN_SETUP for reading from the configuration file.
316 */
317#define NEED_WORK_TREE (1<<3)
318struct cmd_struct {
320 const char *cmd;
321 int (*fn)(int, const char **, const char *);
322 int option;
323};
324static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
326{
327 int status, help;
328 struct stat st;
329 const char *prefix;
330 prefix = NULL;
332 help = argc == 2 && !strcmp(argv[1], "-h");
333 if (!help) {
334 if (p->option & RUN_SETUP)
335 prefix = setup_git_directory();
336 else if (p->option & RUN_SETUP_GENTLY) {
337 int nongit_ok;
338 prefix = setup_git_directory_gently(&nongit_ok);
339 }
340 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
342 use_pager = check_pager_config(p->cmd);
343 if (use_pager == -1 && p->option & USE_PAGER)
344 use_pager = 1;
345 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
347 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
348 trace_repo_setup(prefix);
349 }
350 commit_pager_choice();
351 if (!help && p->option & NEED_WORK_TREE)
353 setup_work_tree();
354 trace_argv_printf(argv, "trace: built-in: git");
356 status = p->fn(argc, argv, prefix);
358 if (status)
359 return status;
360 /* Somebody closed stdout? */
362 if (fstat(fileno(stdout), &st))
363 return 0;
364 /* Ignore write errors for pipes and sockets.. */
365 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
366 return 0;
367 /* Check for ENOSPC and EIO errors.. */
369 if (fflush(stdout))
370 die_errno("write failure on standard output");
371 if (ferror(stdout))
372 die("unknown write failure on standard output");
373 if (fclose(stdout))
374 die_errno("close failed on standard output");
375 return 0;
376}
377static struct cmd_struct commands[] = {
379 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
380 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
381 { "annotate", cmd_annotate, RUN_SETUP },
382 { "apply", cmd_apply, RUN_SETUP_GENTLY },
383 { "archive", cmd_archive },
384 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
385 { "blame", cmd_blame, RUN_SETUP },
386 { "branch", cmd_branch, RUN_SETUP },
387 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
388 { "cat-file", cmd_cat_file, RUN_SETUP },
389 { "check-attr", cmd_check_attr, RUN_SETUP },
390 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
391 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
392 { "check-ref-format", cmd_check_ref_format },
393 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
394 { "checkout-index", cmd_checkout_index,
395 RUN_SETUP | NEED_WORK_TREE},
396 { "cherry", cmd_cherry, RUN_SETUP },
397 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
398 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
399 { "clone", cmd_clone },
400 { "column", cmd_column, RUN_SETUP_GENTLY },
401 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
402 { "commit-tree", cmd_commit_tree, RUN_SETUP },
403 { "config", cmd_config, RUN_SETUP_GENTLY },
404 { "count-objects", cmd_count_objects, RUN_SETUP },
405 { "credential", cmd_credential, RUN_SETUP_GENTLY },
406 { "describe", cmd_describe, RUN_SETUP },
407 { "diff", cmd_diff },
408 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
409 { "diff-index", cmd_diff_index, RUN_SETUP },
410 { "diff-tree", cmd_diff_tree, RUN_SETUP },
411 { "fast-export", cmd_fast_export, RUN_SETUP },
412 { "fetch", cmd_fetch, RUN_SETUP },
413 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
414 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
415 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
416 { "format-patch", cmd_format_patch, RUN_SETUP },
417 { "fsck", cmd_fsck, RUN_SETUP },
418 { "fsck-objects", cmd_fsck, RUN_SETUP },
419 { "gc", cmd_gc, RUN_SETUP },
420 { "get-tar-commit-id", cmd_get_tar_commit_id },
421 { "grep", cmd_grep, RUN_SETUP_GENTLY },
422 { "hash-object", cmd_hash_object },
423 { "help", cmd_help },
424 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
425 { "init", cmd_init_db },
426 { "init-db", cmd_init_db },
427 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
428 { "log", cmd_log, RUN_SETUP },
429 { "ls-files", cmd_ls_files, RUN_SETUP },
430 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
431 { "ls-tree", cmd_ls_tree, RUN_SETUP },
432 { "mailinfo", cmd_mailinfo },
433 { "mailsplit", cmd_mailsplit },
434 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
435 { "merge-base", cmd_merge_base, RUN_SETUP },
436 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
437 { "merge-index", cmd_merge_index, RUN_SETUP },
438 { "merge-ours", cmd_merge_ours, RUN_SETUP },
439 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
440 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
441 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
442 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
443 { "merge-tree", cmd_merge_tree, RUN_SETUP },
444 { "mktag", cmd_mktag, RUN_SETUP },
445 { "mktree", cmd_mktree, RUN_SETUP },
446 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
447 { "name-rev", cmd_name_rev, RUN_SETUP },
448 { "notes", cmd_notes, RUN_SETUP },
449 { "pack-objects", cmd_pack_objects, RUN_SETUP },
450 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
451 { "pack-refs", cmd_pack_refs, RUN_SETUP },
452 { "patch-id", cmd_patch_id },
453 { "pickaxe", cmd_blame, RUN_SETUP },
454 { "prune", cmd_prune, RUN_SETUP },
455 { "prune-packed", cmd_prune_packed, RUN_SETUP },
456 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
457 { "push", cmd_push, RUN_SETUP },
458 { "read-tree", cmd_read_tree, RUN_SETUP },
459 { "receive-pack", cmd_receive_pack },
460 { "reflog", cmd_reflog, RUN_SETUP },
461 { "remote", cmd_remote, RUN_SETUP },
462 { "remote-ext", cmd_remote_ext },
463 { "remote-fd", cmd_remote_fd },
464 { "repack", cmd_repack, RUN_SETUP },
465 { "replace", cmd_replace, RUN_SETUP },
466 { "rerere", cmd_rerere, RUN_SETUP },
467 { "reset", cmd_reset, RUN_SETUP },
468 { "rev-list", cmd_rev_list, RUN_SETUP },
469 { "rev-parse", cmd_rev_parse },
470 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
471 { "rm", cmd_rm, RUN_SETUP },
472 { "send-pack", cmd_send_pack, RUN_SETUP },
473 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
474 { "show", cmd_show, RUN_SETUP },
475 { "show-branch", cmd_show_branch, RUN_SETUP },
476 { "show-ref", cmd_show_ref, RUN_SETUP },
477 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
478 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
479 { "stripspace", cmd_stripspace },
480 { "submodule--helper", cmd_submodule__helper, RUN_SETUP },
481 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
482 { "tag", cmd_tag, RUN_SETUP },
483 { "unpack-file", cmd_unpack_file, RUN_SETUP },
484 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
485 { "update-index", cmd_update_index, RUN_SETUP },
486 { "update-ref", cmd_update_ref, RUN_SETUP },
487 { "update-server-info", cmd_update_server_info, RUN_SETUP },
488 { "upload-archive", cmd_upload_archive },
489 { "upload-archive--writer", cmd_upload_archive_writer },
490 { "var", cmd_var, RUN_SETUP_GENTLY },
491 { "verify-commit", cmd_verify_commit, RUN_SETUP },
492 { "verify-pack", cmd_verify_pack },
493 { "verify-tag", cmd_verify_tag, RUN_SETUP },
494 { "version", cmd_version },
495 { "whatchanged", cmd_whatchanged, RUN_SETUP },
496 { "worktree", cmd_worktree, RUN_SETUP },
497 { "write-tree", cmd_write_tree, RUN_SETUP },
498};
499static struct cmd_struct *get_builtin(const char *s)
501{
502 int i;
503 for (i = 0; i < ARRAY_SIZE(commands); i++) {
504 struct cmd_struct *p = commands + i;
505 if (!strcmp(s, p->cmd))
506 return p;
507 }
508 return NULL;
509}
510int is_builtin(const char *s)
512{
513 return !!get_builtin(s);
514}
515static void handle_builtin(int argc, const char **argv)
517{
518 const char *cmd = argv[0];
519 int i;
520 static const char ext[] = STRIP_EXTENSION;
521 struct cmd_struct *builtin;
522 if (sizeof(ext) > 1) {
524 i = strlen(argv[0]) - strlen(ext);
525 if (i > 0 && !strcmp(argv[0] + i, ext)) {
526 char *argv0 = xstrdup(argv[0]);
527 argv[0] = cmd = argv0;
528 argv0[i] = '\0';
529 }
530 }
531 /* Turn "git cmd --help" into "git help cmd" */
533 if (argc > 1 && !strcmp(argv[1], "--help")) {
534 argv[1] = argv[0];
535 argv[0] = cmd = "help";
536 }
537 builtin = get_builtin(cmd);
539 if (builtin)
540 exit(run_builtin(builtin, argc, argv));
541}
542static void execv_dashed_external(const char **argv)
544{
545 struct strbuf cmd = STRBUF_INIT;
546 const char *tmp;
547 int status;
548 if (use_pager == -1)
550 use_pager = check_pager_config(argv[0]);
551 commit_pager_choice();
552 strbuf_addf(&cmd, "git-%s", argv[0]);
554 /*
556 * argv[0] must be the git command, but the argv array
557 * belongs to the caller, and may be reused in
558 * subsequent loop iterations. Save argv[0] and
559 * restore it on error.
560 */
561 tmp = argv[0];
562 argv[0] = cmd.buf;
563 trace_argv_printf(argv, "trace: exec:");
565 /*
567 * if we fail because the command is not found, it is
568 * OK to return. Otherwise, we just pass along the status code.
569 */
570 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
571 if (status >= 0 || errno != ENOENT)
572 exit(status);
573 argv[0] = tmp;
575 strbuf_release(&cmd);
577}
578static int run_argv(int *argcp, const char ***argv)
580{
581 int done_alias = 0;
582 while (1) {
584 /*
585 * If we tried alias and futzed with our environment,
586 * it no longer is safe to invoke builtins directly in
587 * general. We have to spawn them as dashed externals.
588 *
589 * NEEDSWORK: if we can figure out cases
590 * where it is safe to do, we can avoid spawning a new
591 * process.
592 */
593 if (!done_alias)
594 handle_builtin(*argcp, *argv);
595 /* .. then try the external ones */
597 execv_dashed_external(*argv);
598 /* It could be an alias -- this works around the insanity
600 * of overriding "git log" with "git show" by having
601 * alias.log = show
602 */
603 if (done_alias)
604 break;
605 if (!handle_alias(argcp, argv))
606 break;
607 done_alias = 1;
608 }
609 return done_alias;
611}
612/*
614 * Many parts of Git have subprograms communicate via pipe, expect the
615 * upstream of a pipe to die with SIGPIPE when the downstream of a
616 * pipe does not need to read all that is written. Some third-party
617 * programs that ignore or block SIGPIPE for their own reason forget
618 * to restore SIGPIPE handling to the default before spawning Git and
619 * break this carefully orchestrated machinery.
620 *
621 * Restore the way SIGPIPE is handled to default, which is what we
622 * expect.
623 */
624static void restore_sigpipe_to_default(void)
625{
626 sigset_t unblock;
627 sigemptyset(&unblock);
629 sigaddset(&unblock, SIGPIPE);
630 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
631 signal(SIGPIPE, SIG_DFL);
632}
633int main(int argc, char **av)
635{
636 const char **argv = (const char **) av;
637 const char *cmd;
638 int done_help = 0;
639 startup_info = &git_startup_info;
641 cmd = git_extract_argv0_path(argv[0]);
643 if (!cmd)
644 cmd = "git-help";
645 /*
647 * Always open file descriptors 0/1/2 to avoid clobbering files
648 * in die(). It also avoids messing up when the pipes are dup'ed
649 * onto stdin/stdout/stderr in the child processes we spawn.
650 */
651 sanitize_stdfds();
652 restore_sigpipe_to_default();
654 git_setup_gettext();
656 trace_command_performance(argv);
658 /*
660 * "git-xxxx" is the same as "git xxxx", but we obviously:
661 *
662 * - cannot take flags in between the "git" and the "xxxx".
663 * - cannot execute it externally (since it would just do
664 * the same thing over again)
665 *
666 * So we just directly call the builtin handler, and die if
667 * that one cannot handle it.
668 */
669 if (skip_prefix(cmd, "git-", &cmd)) {
670 argv[0] = cmd;
671 handle_builtin(argc, argv);
672 die("cannot handle %s as a builtin", cmd);
673 }
674 /* Look for flags.. */
676 argv++;
677 argc--;
678 handle_options(&argv, &argc, NULL);
679 if (argc > 0) {
680 /* translate --help and --version into commands */
681 skip_prefix(argv[0], "--", &argv[0]);
682 } else {
683 /* The user didn't specify a command; give them help */
684 commit_pager_choice();
685 printf("usage: %s\n\n", git_usage_string);
686 list_common_cmds_help();
687 printf("\n%s\n", _(git_more_info_string));
688 exit(1);
689 }
690 cmd = argv[0];
691 /*
693 * We use PATH to find git commands, but we prepend some higher
694 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
695 * environment, and the $(gitexecdir) from the Makefile at build
696 * time.
697 */
698 setup_path();
699 while (1) {
701 int was_alias = run_argv(&argc, &argv);
702 if (errno != ENOENT)
703 break;
704 if (was_alias) {
705 fprintf(stderr, "Expansion of alias '%s' failed; "
706 "'%s' is not a git command\n",
707 cmd, argv[0]);
708 exit(1);
709 }
710 if (!done_help) {
711 cmd = argv[0] = help_unknown_cmd(cmd);
712 done_help = 1;
713 } else
714 break;
715 }
716 fprintf(stderr, "Failed to run command '%s': %s\n",
718 cmd, strerror(errno));
719 return 1;
721}