1#include "builtin.h"
2#include "cache.h"
3#include "exec_cmd.h"
4#include "help.h"
5#include "quote.h"
6#include "run-command.h"
7#include "commit.h"
8const char git_usage_string[] =
10 "git [--version] [--help] [-C <path>] [-c name=value]\n"
11 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
12 " [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
13 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
14 " <command> [<args>]";
15const char git_more_info_string[] =
17 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
18 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
19 "to read about a specific subcommand or concept.");
20static struct startup_info git_startup_info;
22static int use_pager = -1;
23static char *orig_cwd;
24static const char *env_names[] = {
25 GIT_DIR_ENVIRONMENT,
26 GIT_WORK_TREE_ENVIRONMENT,
27 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
28 GIT_PREFIX_ENVIRONMENT
29};
30static char *orig_env[4];
31static int saved_environment;
32static void save_env(void)
34{
35 int i;
36 if (saved_environment)
37 return;
38 saved_environment = 1;
39 orig_cwd = xgetcwd();
40 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
41 orig_env[i] = getenv(env_names[i]);
42 if (orig_env[i])
43 orig_env[i] = xstrdup(orig_env[i]);
44 }
45}
46static void restore_env(void)
48{
49 int i;
50 if (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 (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 (chdir((*argv)[1]))
211 die_errno("Cannot change to '%s'", (*argv)[1]);
212 if (envchanged)
213 *envchanged = 1;
214 (*argv)++;
215 (*argc)--;
216 } else {
217 fprintf(stderr, "Unknown option: %s\n", cmd);
218 usage(git_usage_string);
219 }
220 (*argv)++;
222 (*argc)--;
223 }
224 return (*argv) - orig_argv;
225}
226static int handle_alias(int *argcp, const char ***argv)
228{
229 int envchanged = 0, ret = 0, saved_errno = errno;
230 const char *subdir;
231 int count, option_count;
232 const char **new_argv;
233 const char *alias_command;
234 char *alias_string;
235 int unused_nongit;
236 subdir = setup_git_directory_gently(&unused_nongit);
238 alias_command = (*argv)[0];
240 alias_string = alias_lookup(alias_command);
241 if (alias_string) {
242 if (alias_string[0] == '!') {
243 const char **alias_argv;
244 int argc = *argcp, i;
245 commit_pager_choice();
247 /* build alias_argv */
249 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
250 alias_argv[0] = alias_string + 1;
251 for (i = 1; i < argc; ++i)
252 alias_argv[i] = (*argv)[i];
253 alias_argv[argc] = NULL;
254 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
256 if (ret >= 0) /* normal exit */
257 exit(ret);
258 die_errno("While expanding alias '%s': '%s'",
260 alias_command, alias_string + 1);
261 }
262 count = split_cmdline(alias_string, &new_argv);
263 if (count < 0)
264 die("Bad alias.%s string: %s", alias_command,
265 split_cmdline_strerror(count));
266 option_count = handle_options(&new_argv, &count, &envchanged);
267 if (envchanged)
268 die("alias '%s' changes environment variables\n"
269 "You can use '!git' in the alias to do this.",
270 alias_command);
271 memmove(new_argv - option_count, new_argv,
272 count * sizeof(char *));
273 new_argv -= option_count;
274 if (count < 1)
276 die("empty alias for %s", alias_command);
277 if (!strcmp(alias_command, new_argv[0]))
279 die("recursive alias: %s", alias_command);
280 trace_argv_printf(new_argv,
282 "trace: alias expansion: %s =>",
283 alias_command);
284 REALLOC_ARRAY(new_argv, count + *argcp);
286 /* insert after command name */
287 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
288 *argv = new_argv;
290 *argcp += count - 1;
291 ret = 1;
293 }
294 if (subdir && chdir(subdir))
296 die_errno("Cannot change to '%s'", subdir);
297 errno = saved_errno;
299 return ret;
301}
302#define RUN_SETUP (1<<0)
304#define RUN_SETUP_GENTLY (1<<1)
305#define USE_PAGER (1<<2)
306/*
307 * require working tree to be present -- anything uses this needs
308 * RUN_SETUP for reading from the configuration file.
309 */
310#define NEED_WORK_TREE (1<<3)
311#define NO_SETUP (1<<4)
312struct cmd_struct {
314 const char *cmd;
315 int (*fn)(int, const char **, const char *);
316 int option;
317};
318static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
320{
321 int status, help;
322 struct stat st;
323 const char *prefix;
324 prefix = NULL;
326 help = argc == 2 && !strcmp(argv[1], "-h");
327 if (!help) {
328 if (p->option & RUN_SETUP)
329 prefix = setup_git_directory();
330 else if (p->option & RUN_SETUP_GENTLY) {
331 int nongit_ok;
332 prefix = setup_git_directory_gently(&nongit_ok);
333 }
334 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
336 use_pager = check_pager_config(p->cmd);
337 if (use_pager == -1 && p->option & USE_PAGER)
338 use_pager = 1;
339 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
341 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
342 trace_repo_setup(prefix);
343 }
344 commit_pager_choice();
345 if (!help && p->option & NEED_WORK_TREE)
347 setup_work_tree();
348 trace_argv_printf(argv, "trace: built-in: git");
350 status = p->fn(argc, argv, prefix);
352 if (status)
353 return status;
354 /* Somebody closed stdout? */
356 if (fstat(fileno(stdout), &st))
357 return 0;
358 /* Ignore write errors for pipes and sockets.. */
359 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
360 return 0;
361 /* Check for ENOSPC and EIO errors.. */
363 if (fflush(stdout))
364 die_errno("write failure on standard output");
365 if (ferror(stdout))
366 die("unknown write failure on standard output");
367 if (fclose(stdout))
368 die_errno("close failed on standard output");
369 return 0;
370}
371static struct cmd_struct commands[] = {
373 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
374 { "annotate", cmd_annotate, RUN_SETUP },
375 { "apply", cmd_apply, RUN_SETUP_GENTLY },
376 { "archive", cmd_archive },
377 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
378 { "blame", cmd_blame, RUN_SETUP },
379 { "branch", cmd_branch, RUN_SETUP },
380 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
381 { "cat-file", cmd_cat_file, RUN_SETUP },
382 { "check-attr", cmd_check_attr, RUN_SETUP },
383 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
384 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
385 { "check-ref-format", cmd_check_ref_format },
386 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
387 { "checkout-index", cmd_checkout_index,
388 RUN_SETUP | NEED_WORK_TREE},
389 { "cherry", cmd_cherry, RUN_SETUP },
390 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
391 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
392 { "clone", cmd_clone, NO_SETUP },
393 { "column", cmd_column, RUN_SETUP_GENTLY },
394 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
395 { "commit-tree", cmd_commit_tree, RUN_SETUP },
396 { "config", cmd_config, RUN_SETUP_GENTLY },
397 { "count-objects", cmd_count_objects, RUN_SETUP },
398 { "credential", cmd_credential, RUN_SETUP_GENTLY },
399 { "describe", cmd_describe, RUN_SETUP },
400 { "diff", cmd_diff },
401 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
402 { "diff-index", cmd_diff_index, RUN_SETUP },
403 { "diff-tree", cmd_diff_tree, RUN_SETUP },
404 { "fast-export", cmd_fast_export, RUN_SETUP },
405 { "fetch", cmd_fetch, RUN_SETUP },
406 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
407 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
408 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
409 { "format-patch", cmd_format_patch, RUN_SETUP },
410 { "fsck", cmd_fsck, RUN_SETUP },
411 { "fsck-objects", cmd_fsck, RUN_SETUP },
412 { "gc", cmd_gc, RUN_SETUP },
413 { "get-tar-commit-id", cmd_get_tar_commit_id },
414 { "grep", cmd_grep, RUN_SETUP_GENTLY },
415 { "hash-object", cmd_hash_object },
416 { "help", cmd_help },
417 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
418 { "init", cmd_init_db, NO_SETUP },
419 { "init-db", cmd_init_db, NO_SETUP },
420 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP },
421 { "log", cmd_log, RUN_SETUP },
422 { "ls-files", cmd_ls_files, RUN_SETUP },
423 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
424 { "ls-tree", cmd_ls_tree, RUN_SETUP },
425 { "mailinfo", cmd_mailinfo },
426 { "mailsplit", cmd_mailsplit },
427 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
428 { "merge-base", cmd_merge_base, RUN_SETUP },
429 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
430 { "merge-index", cmd_merge_index, RUN_SETUP },
431 { "merge-ours", cmd_merge_ours, RUN_SETUP },
432 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
433 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
434 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
435 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
436 { "merge-tree", cmd_merge_tree, RUN_SETUP },
437 { "mktag", cmd_mktag, RUN_SETUP },
438 { "mktree", cmd_mktree, RUN_SETUP },
439 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
440 { "name-rev", cmd_name_rev, RUN_SETUP },
441 { "notes", cmd_notes, RUN_SETUP },
442 { "pack-objects", cmd_pack_objects, RUN_SETUP },
443 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
444 { "pack-refs", cmd_pack_refs, RUN_SETUP },
445 { "patch-id", cmd_patch_id },
446 { "pickaxe", cmd_blame, RUN_SETUP },
447 { "prune", cmd_prune, RUN_SETUP },
448 { "prune-packed", cmd_prune_packed, RUN_SETUP },
449 { "push", cmd_push, RUN_SETUP },
450 { "read-tree", cmd_read_tree, RUN_SETUP },
451 { "receive-pack", cmd_receive_pack },
452 { "reflog", cmd_reflog, RUN_SETUP },
453 { "remote", cmd_remote, RUN_SETUP },
454 { "remote-ext", cmd_remote_ext },
455 { "remote-fd", cmd_remote_fd },
456 { "repack", cmd_repack, RUN_SETUP },
457 { "replace", cmd_replace, RUN_SETUP },
458 { "rerere", cmd_rerere, RUN_SETUP },
459 { "reset", cmd_reset, RUN_SETUP },
460 { "rev-list", cmd_rev_list, RUN_SETUP },
461 { "rev-parse", cmd_rev_parse },
462 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
463 { "rm", cmd_rm, RUN_SETUP },
464 { "send-pack", cmd_send_pack, RUN_SETUP },
465 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
466 { "show", cmd_show, RUN_SETUP },
467 { "show-branch", cmd_show_branch, RUN_SETUP },
468 { "show-ref", cmd_show_ref, RUN_SETUP },
469 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
470 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
471 { "stripspace", cmd_stripspace },
472 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
473 { "tag", cmd_tag, RUN_SETUP },
474 { "unpack-file", cmd_unpack_file, RUN_SETUP },
475 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
476 { "update-index", cmd_update_index, RUN_SETUP },
477 { "update-ref", cmd_update_ref, RUN_SETUP },
478 { "update-server-info", cmd_update_server_info, RUN_SETUP },
479 { "upload-archive", cmd_upload_archive },
480 { "upload-archive--writer", cmd_upload_archive_writer },
481 { "var", cmd_var, RUN_SETUP_GENTLY },
482 { "verify-commit", cmd_verify_commit, RUN_SETUP },
483 { "verify-pack", cmd_verify_pack },
484 { "verify-tag", cmd_verify_tag, RUN_SETUP },
485 { "version", cmd_version },
486 { "whatchanged", cmd_whatchanged, RUN_SETUP },
487 { "write-tree", cmd_write_tree, RUN_SETUP },
488};
489static struct cmd_struct *get_builtin(const char *s)
491{
492 int i;
493 for (i = 0; i < ARRAY_SIZE(commands); i++) {
494 struct cmd_struct *p = commands + i;
495 if (!strcmp(s, p->cmd))
496 return p;
497 }
498 return NULL;
499}
500int is_builtin(const char *s)
502{
503 return !!get_builtin(s);
504}
505static void handle_builtin(int argc, const char **argv)
507{
508 const char *cmd = argv[0];
509 int i;
510 static const char ext[] = STRIP_EXTENSION;
511 struct cmd_struct *builtin;
512 if (sizeof(ext) > 1) {
514 i = strlen(argv[0]) - strlen(ext);
515 if (i > 0 && !strcmp(argv[0] + i, ext)) {
516 char *argv0 = xstrdup(argv[0]);
517 argv[0] = cmd = argv0;
518 argv0[i] = '\0';
519 }
520 }
521 /* Turn "git cmd --help" into "git help cmd" */
523 if (argc > 1 && !strcmp(argv[1], "--help")) {
524 argv[1] = argv[0];
525 argv[0] = cmd = "help";
526 }
527 builtin = get_builtin(cmd);
529 if (builtin) {
530 if (saved_environment && (builtin->option & NO_SETUP))
531 restore_env();
532 else
533 exit(run_builtin(builtin, argc, argv));
534 }
535}
536static void execv_dashed_external(const char **argv)
538{
539 struct strbuf cmd = STRBUF_INIT;
540 const char *tmp;
541 int status;
542 if (use_pager == -1)
544 use_pager = check_pager_config(argv[0]);
545 commit_pager_choice();
546 strbuf_addf(&cmd, "git-%s", argv[0]);
548 /*
550 * argv[0] must be the git command, but the argv array
551 * belongs to the caller, and may be reused in
552 * subsequent loop iterations. Save argv[0] and
553 * restore it on error.
554 */
555 tmp = argv[0];
556 argv[0] = cmd.buf;
557 trace_argv_printf(argv, "trace: exec:");
559 /*
561 * if we fail because the command is not found, it is
562 * OK to return. Otherwise, we just pass along the status code.
563 */
564 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
565 if (status >= 0 || errno != ENOENT)
566 exit(status);
567 argv[0] = tmp;
569 strbuf_release(&cmd);
571}
572static int run_argv(int *argcp, const char ***argv)
574{
575 int done_alias = 0;
576 while (1) {
578 /* See if it's a builtin */
579 handle_builtin(*argcp, *argv);
580 /* .. then try the external ones */
582 execv_dashed_external(*argv);
583 /* It could be an alias -- this works around the insanity
585 * of overriding "git log" with "git show" by having
586 * alias.log = show
587 */
588 if (done_alias)
589 break;
590 save_env();
591 if (!handle_alias(argcp, argv))
592 break;
593 done_alias = 1;
594 }
595 return done_alias;
597}
598/*
600 * Many parts of Git have subprograms communicate via pipe, expect the
601 * upstream of a pipe to die with SIGPIPE when the downstream of a
602 * pipe does not need to read all that is written. Some third-party
603 * programs that ignore or block SIGPIPE for their own reason forget
604 * to restore SIGPIPE handling to the default before spawning Git and
605 * break this carefully orchestrated machinery.
606 *
607 * Restore the way SIGPIPE is handled to default, which is what we
608 * expect.
609 */
610static void restore_sigpipe_to_default(void)
611{
612 sigset_t unblock;
613 sigemptyset(&unblock);
615 sigaddset(&unblock, SIGPIPE);
616 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
617 signal(SIGPIPE, SIG_DFL);
618}
619int main(int argc, char **av)
621{
622 const char **argv = (const char **) av;
623 const char *cmd;
624 startup_info = &git_startup_info;
626 cmd = git_extract_argv0_path(argv[0]);
628 if (!cmd)
629 cmd = "git-help";
630 /*
632 * Always open file descriptors 0/1/2 to avoid clobbering files
633 * in die(). It also avoids messing up when the pipes are dup'ed
634 * onto stdin/stdout/stderr in the child processes we spawn.
635 */
636 sanitize_stdfds();
637 restore_sigpipe_to_default();
639 git_setup_gettext();
641 trace_command_performance(argv);
643 /*
645 * "git-xxxx" is the same as "git xxxx", but we obviously:
646 *
647 * - cannot take flags in between the "git" and the "xxxx".
648 * - cannot execute it externally (since it would just do
649 * the same thing over again)
650 *
651 * So we just directly call the builtin handler, and die if
652 * that one cannot handle it.
653 */
654 if (skip_prefix(cmd, "git-", &cmd)) {
655 argv[0] = cmd;
656 handle_builtin(argc, argv);
657 die("cannot handle %s as a builtin", cmd);
658 }
659 /* Look for flags.. */
661 argv++;
662 argc--;
663 handle_options(&argv, &argc, NULL);
664 if (argc > 0) {
665 /* translate --help and --version into commands */
666 skip_prefix(argv[0], "--", &argv[0]);
667 } else {
668 /* The user didn't specify a command; give them help */
669 commit_pager_choice();
670 printf("usage: %s\n\n", git_usage_string);
671 list_common_cmds_help();
672 printf("\n%s\n", _(git_more_info_string));
673 exit(1);
674 }
675 cmd = argv[0];
676 /*
678 * We use PATH to find git commands, but we prepend some higher
679 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
680 * environment, and the $(gitexecdir) from the Makefile at build
681 * time.
682 */
683 setup_path();
684 while (1) {
686 static int done_help = 0;
687 static int was_alias = 0;
688 was_alias = run_argv(&argc, &argv);
689 if (errno != ENOENT)
690 break;
691 if (was_alias) {
692 fprintf(stderr, "Expansion of alias '%s' failed; "
693 "'%s' is not a git command\n",
694 cmd, argv[0]);
695 exit(1);
696 }
697 if (!done_help) {
698 cmd = argv[0] = help_unknown_cmd(cmd);
699 done_help = 1;
700 } else
701 break;
702 }
703 fprintf(stderr, "Failed to run command '%s': %s\n",
705 cmd, strerror(errno));
706 return 1;
708}