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 orig_env[i] = xstrdup_or_null(orig_env[i]);
39 }
40}
41static void restore_env(int external_alias)
43{
44 int i;
45 assert(save_restore_env_balance == 1);
47 save_restore_env_balance = 0;
48 if (!external_alias && orig_cwd && chdir(orig_cwd))
49 die_errno("could not move to %s", orig_cwd);
50 free(orig_cwd);
51 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
52 if (external_alias &&
53 !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
54 continue;
55 if (orig_env[i]) {
56 setenv(env_names[i], orig_env[i], 1);
57 free(orig_env[i]);
58 } else {
59 unsetenv(env_names[i]);
60 }
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, "--super-prefix")) {
167 if (*argc < 2) {
168 fprintf(stderr, "No prefix given for --super-prefix.\n" );
169 usage(git_usage_string);
170 }
171 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
172 if (envchanged)
173 *envchanged = 1;
174 (*argv)++;
175 (*argc)--;
176 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
177 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
178 if (envchanged)
179 *envchanged = 1;
180 } else if (!strcmp(cmd, "--bare")) {
181 char *cwd = xgetcwd();
182 is_bare_repository_cfg = 1;
183 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
184 free(cwd);
185 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
186 if (envchanged)
187 *envchanged = 1;
188 } else if (!strcmp(cmd, "-c")) {
189 if (*argc < 2) {
190 fprintf(stderr, "-c expects a configuration string\n" );
191 usage(git_usage_string);
192 }
193 git_config_push_parameter((*argv)[1]);
194 (*argv)++;
195 (*argc)--;
196 } else if (!strcmp(cmd, "--literal-pathspecs")) {
197 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
198 if (envchanged)
199 *envchanged = 1;
200 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
201 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
202 if (envchanged)
203 *envchanged = 1;
204 } else if (!strcmp(cmd, "--glob-pathspecs")) {
205 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
206 if (envchanged)
207 *envchanged = 1;
208 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
209 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
210 if (envchanged)
211 *envchanged = 1;
212 } else if (!strcmp(cmd, "--icase-pathspecs")) {
213 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
214 if (envchanged)
215 *envchanged = 1;
216 } else if (!strcmp(cmd, "--shallow-file")) {
217 (*argv)++;
218 (*argc)--;
219 set_alternate_shallow_file((*argv)[0], 1);
220 if (envchanged)
221 *envchanged = 1;
222 } else if (!strcmp(cmd, "-C")) {
223 if (*argc < 2) {
224 fprintf(stderr, "No directory given for -C.\n" );
225 usage(git_usage_string);
226 }
227 if ((*argv)[1][0]) {
228 if (chdir((*argv)[1]))
229 die_errno("Cannot change to '%s'", (*argv)[1]);
230 if (envchanged)
231 *envchanged = 1;
232 }
233 (*argv)++;
234 (*argc)--;
235 } else {
236 fprintf(stderr, "Unknown option: %s\n", cmd);
237 usage(git_usage_string);
238 }
239 (*argv)++;
241 (*argc)--;
242 }
243 return (*argv) - orig_argv;
244}
245static int handle_alias(int *argcp, const char ***argv)
247{
248 int envchanged = 0, ret = 0, saved_errno = errno;
249 int count, option_count;
250 const char **new_argv;
251 const char *alias_command;
252 char *alias_string;
253 int unused_nongit;
254 save_env_before_alias();
256 setup_git_directory_gently(&unused_nongit);
257 alias_command = (*argv)[0];
259 alias_string = alias_lookup(alias_command);
260 if (alias_string) {
261 if (alias_string[0] == '!') {
262 struct child_process child = CHILD_PROCESS_INIT;
263 commit_pager_choice();
265 restore_env(1);
266 child.use_shell = 1;
268 argv_array_push(&child.args, alias_string + 1);
269 argv_array_pushv(&child.args, (*argv) + 1);
270 ret = run_command(&child);
272 if (ret >= 0) /* normal exit */
273 exit(ret);
274 die_errno("While expanding alias '%s': '%s'",
276 alias_command, alias_string + 1);
277 }
278 count = split_cmdline(alias_string, &new_argv);
279 if (count < 0)
280 die("Bad alias.%s string: %s", alias_command,
281 split_cmdline_strerror(count));
282 option_count = handle_options(&new_argv, &count, &envchanged);
283 if (envchanged)
284 die("alias '%s' changes environment variables\n"
285 "You can use '!git' in the alias to do this.",
286 alias_command);
287 memmove(new_argv - option_count, new_argv,
288 count * sizeof(char *));
289 new_argv -= option_count;
290 if (count < 1)
292 die("empty alias for %s", alias_command);
293 if (!strcmp(alias_command, new_argv[0]))
295 die("recursive alias: %s", alias_command);
296 trace_argv_printf(new_argv,
298 "trace: alias expansion: %s =>",
299 alias_command);
300 REALLOC_ARRAY(new_argv, count + *argcp);
302 /* insert after command name */
303 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
304 *argv = new_argv;
306 *argcp += count - 1;
307 ret = 1;
309 }
310 restore_env(0);
312 errno = saved_errno;
314 return ret;
316}
317#define RUN_SETUP (1<<0)
319#define RUN_SETUP_GENTLY (1<<1)
320#define USE_PAGER (1<<2)
321/*
322 * require working tree to be present -- anything uses this needs
323 * RUN_SETUP for reading from the configuration file.
324 */
325#define NEED_WORK_TREE (1<<3)
326#define SUPPORT_SUPER_PREFIX (1<<4)
327struct cmd_struct {
329 const char *cmd;
330 int (*fn)(int, const char **, const char *);
331 int option;
332};
333static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
335{
336 int status, help;
337 struct stat st;
338 const char *prefix;
339 prefix = NULL;
341 help = argc == 2 && !strcmp(argv[1], "-h");
342 if (!help) {
343 if (p->option & RUN_SETUP)
344 prefix = setup_git_directory();
345 else if (p->option & RUN_SETUP_GENTLY) {
346 int nongit_ok;
347 prefix = setup_git_directory_gently(&nongit_ok);
348 }
349 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
351 use_pager = check_pager_config(p->cmd);
352 if (use_pager == -1 && p->option & USE_PAGER)
353 use_pager = 1;
354 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
356 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
357 trace_repo_setup(prefix);
358 }
359 commit_pager_choice();
360 if (!help && get_super_prefix()) {
362 if (!(p->option & SUPPORT_SUPER_PREFIX))
363 die("%s doesn't support --super-prefix", p->cmd);
364 }
365 if (!help && p->option & NEED_WORK_TREE)
367 setup_work_tree();
368 trace_argv_printf(argv, "trace: built-in: git");
370 status = p->fn(argc, argv, prefix);
372 if (status)
373 return status;
374 /* Somebody closed stdout? */
376 if (fstat(fileno(stdout), &st))
377 return 0;
378 /* Ignore write errors for pipes and sockets.. */
379 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
380 return 0;
381 /* Check for ENOSPC and EIO errors.. */
383 if (fflush(stdout))
384 die_errno("write failure on standard output");
385 if (ferror(stdout))
386 die("unknown write failure on standard output");
387 if (fclose(stdout))
388 die_errno("close failed on standard output");
389 return 0;
390}
391static struct cmd_struct commands[] = {
393 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
394 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
395 { "annotate", cmd_annotate, RUN_SETUP },
396 { "apply", cmd_apply, RUN_SETUP_GENTLY },
397 { "archive", cmd_archive, RUN_SETUP_GENTLY },
398 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
399 { "blame", cmd_blame, RUN_SETUP },
400 { "branch", cmd_branch, RUN_SETUP },
401 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
402 { "cat-file", cmd_cat_file, RUN_SETUP },
403 { "check-attr", cmd_check_attr, RUN_SETUP },
404 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
405 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
406 { "check-ref-format", cmd_check_ref_format },
407 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
408 { "checkout-index", cmd_checkout_index,
409 RUN_SETUP | NEED_WORK_TREE},
410 { "cherry", cmd_cherry, RUN_SETUP },
411 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
412 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
413 { "clone", cmd_clone },
414 { "column", cmd_column, RUN_SETUP_GENTLY },
415 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
416 { "commit-tree", cmd_commit_tree, RUN_SETUP },
417 { "config", cmd_config, RUN_SETUP_GENTLY },
418 { "count-objects", cmd_count_objects, RUN_SETUP },
419 { "credential", cmd_credential, RUN_SETUP_GENTLY },
420 { "describe", cmd_describe, RUN_SETUP },
421 { "diff", cmd_diff },
422 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
423 { "diff-index", cmd_diff_index, RUN_SETUP },
424 { "diff-tree", cmd_diff_tree, RUN_SETUP },
425 { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
426 { "fast-export", cmd_fast_export, RUN_SETUP },
427 { "fetch", cmd_fetch, RUN_SETUP },
428 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
429 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
430 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
431 { "format-patch", cmd_format_patch, RUN_SETUP },
432 { "fsck", cmd_fsck, RUN_SETUP },
433 { "fsck-objects", cmd_fsck, RUN_SETUP },
434 { "gc", cmd_gc, RUN_SETUP },
435 { "get-tar-commit-id", cmd_get_tar_commit_id },
436 { "grep", cmd_grep, RUN_SETUP_GENTLY | SUPPORT_SUPER_PREFIX },
437 { "hash-object", cmd_hash_object },
438 { "help", cmd_help },
439 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
440 { "init", cmd_init_db },
441 { "init-db", cmd_init_db },
442 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
443 { "log", cmd_log, RUN_SETUP },
444 { "ls-files", cmd_ls_files, RUN_SETUP | SUPPORT_SUPER_PREFIX },
445 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
446 { "ls-tree", cmd_ls_tree, RUN_SETUP },
447 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
448 { "mailsplit", cmd_mailsplit },
449 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
450 { "merge-base", cmd_merge_base, RUN_SETUP },
451 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
452 { "merge-index", cmd_merge_index, RUN_SETUP },
453 { "merge-ours", cmd_merge_ours, RUN_SETUP },
454 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
455 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
456 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
457 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
458 { "merge-tree", cmd_merge_tree, RUN_SETUP },
459 { "mktag", cmd_mktag, RUN_SETUP },
460 { "mktree", cmd_mktree, RUN_SETUP },
461 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
462 { "name-rev", cmd_name_rev, RUN_SETUP },
463 { "notes", cmd_notes, RUN_SETUP },
464 { "pack-objects", cmd_pack_objects, RUN_SETUP },
465 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
466 { "pack-refs", cmd_pack_refs, RUN_SETUP },
467 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY },
468 { "pickaxe", cmd_blame, RUN_SETUP },
469 { "prune", cmd_prune, RUN_SETUP },
470 { "prune-packed", cmd_prune_packed, RUN_SETUP },
471 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
472 { "push", cmd_push, RUN_SETUP },
473 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
474 { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
475 { "receive-pack", cmd_receive_pack },
476 { "reflog", cmd_reflog, RUN_SETUP },
477 { "remote", cmd_remote, RUN_SETUP },
478 { "remote-ext", cmd_remote_ext },
479 { "remote-fd", cmd_remote_fd },
480 { "repack", cmd_repack, RUN_SETUP },
481 { "replace", cmd_replace, RUN_SETUP },
482 { "rerere", cmd_rerere, RUN_SETUP },
483 { "reset", cmd_reset, RUN_SETUP },
484 { "rev-list", cmd_rev_list, RUN_SETUP },
485 { "rev-parse", cmd_rev_parse },
486 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
487 { "rm", cmd_rm, RUN_SETUP },
488 { "send-pack", cmd_send_pack, RUN_SETUP },
489 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
490 { "show", cmd_show, RUN_SETUP },
491 { "show-branch", cmd_show_branch, RUN_SETUP },
492 { "show-ref", cmd_show_ref, RUN_SETUP },
493 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
494 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
495 { "stripspace", cmd_stripspace },
496 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX},
497 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
498 { "tag", cmd_tag, RUN_SETUP },
499 { "unpack-file", cmd_unpack_file, RUN_SETUP },
500 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
501 { "update-index", cmd_update_index, RUN_SETUP },
502 { "update-ref", cmd_update_ref, RUN_SETUP },
503 { "update-server-info", cmd_update_server_info, RUN_SETUP },
504 { "upload-archive", cmd_upload_archive },
505 { "upload-archive--writer", cmd_upload_archive_writer },
506 { "var", cmd_var, RUN_SETUP_GENTLY },
507 { "verify-commit", cmd_verify_commit, RUN_SETUP },
508 { "verify-pack", cmd_verify_pack },
509 { "verify-tag", cmd_verify_tag, RUN_SETUP },
510 { "version", cmd_version },
511 { "whatchanged", cmd_whatchanged, RUN_SETUP },
512 { "worktree", cmd_worktree, RUN_SETUP },
513 { "write-tree", cmd_write_tree, RUN_SETUP },
514};
515static struct cmd_struct *get_builtin(const char *s)
517{
518 int i;
519 for (i = 0; i < ARRAY_SIZE(commands); i++) {
520 struct cmd_struct *p = commands + i;
521 if (!strcmp(s, p->cmd))
522 return p;
523 }
524 return NULL;
525}
526int is_builtin(const char *s)
528{
529 return !!get_builtin(s);
530}
531#ifdef STRIP_EXTENSION
533static void strip_extension(const char **argv)
534{
535 size_t len;
536 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
538 argv[0] = xmemdupz(argv[0], len);
539}
540#else
541#define strip_extension(cmd)
542#endif
543static void handle_builtin(int argc, const char **argv)
545{
546 struct argv_array args = ARGV_ARRAY_INIT;
547 const char *cmd;
548 struct cmd_struct *builtin;
549 strip_extension(argv);
551 cmd = argv[0];
552 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
554 if (argc > 1 && !strcmp(argv[1], "--help")) {
555 int i;
556 argv[1] = argv[0];
558 argv[0] = cmd = "help";
559 for (i = 0; i < argc; i++) {
561 argv_array_push(&args, argv[i]);
562 if (!i)
563 argv_array_push(&args, "--exclude-guides");
564 }
565 argc++;
567 argv = args.argv;
568 }
569 builtin = get_builtin(cmd);
571 if (builtin)
572 exit(run_builtin(builtin, argc, argv));
573 argv_array_clear(&args);
574}
575static void execv_dashed_external(const char **argv)
577{
578 struct child_process cmd = CHILD_PROCESS_INIT;
579 int status;
580 if (get_super_prefix())
582 die("%s doesn't support --super-prefix", argv[0]);
583 if (use_pager == -1)
585 use_pager = check_pager_config(argv[0]);
586 commit_pager_choice();
587 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
589 argv_array_pushv(&cmd.args, argv + 1);
590 cmd.clean_on_exit = 1;
591 cmd.wait_after_clean = 1;
592 cmd.silent_exec_failure = 1;
593 trace_argv_printf(cmd.args.argv, "trace: exec:");
595 /*
597 * If we fail because the command is not found, it is
598 * OK to return. Otherwise, we just pass along the status code,
599 * or our usual generic code if we were not even able to exec
600 * the program.
601 */
602 status = run_command(&cmd);
603 if (status >= 0)
604 exit(status);
605 else if (errno != ENOENT)
606 exit(128);
607}
608static int run_argv(int *argcp, const char ***argv)
610{
611 int done_alias = 0;
612 while (1) {
614 /*
615 * If we tried alias and futzed with our environment,
616 * it no longer is safe to invoke builtins directly in
617 * general. We have to spawn them as dashed externals.
618 *
619 * NEEDSWORK: if we can figure out cases
620 * where it is safe to do, we can avoid spawning a new
621 * process.
622 */
623 if (!done_alias)
624 handle_builtin(*argcp, *argv);
625 /* .. then try the external ones */
627 execv_dashed_external(*argv);
628 /* It could be an alias -- this works around the insanity
630 * of overriding "git log" with "git show" by having
631 * alias.log = show
632 */
633 if (done_alias)
634 break;
635 if (!handle_alias(argcp, argv))
636 break;
637 done_alias = 1;
638 }
639 return done_alias;
641}
642int cmd_main(int argc, const char **argv)
644{
645 const char *cmd;
646 int done_help = 0;
647 cmd = argv[0];
649 if (!cmd)
650 cmd = "git-help";
651 else {
652 const char *slash = find_last_dir_sep(cmd);
653 if (slash)
654 cmd = slash + 1;
655 }
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}