79195ebbdfc1a1964d155f28951ee9ffbe279887
1#include "builtin.h"
2#include "config.h"
3#include "exec_cmd.h"
4#include "help.h"
5#include "run-command.h"
6const char git_usage_string[] =
8 "git [--version] [--help] [-C <path>] [-c name=value]\n"
9 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
10 " [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n"
11 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
12 " <command> [<args>]";
13const char git_more_info_string[] =
15 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
16 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
17 "to read about a specific subcommand or concept.");
18static int use_pager = -1;
20static void list_builtins(void);
22static void commit_pager_choice(void) {
24 switch (use_pager) {
25 case 0:
26 setenv("GIT_PAGER", "cat", 1);
27 break;
28 case 1:
29 setup_pager();
30 break;
31 default:
32 break;
33 }
34}
35static int handle_options(const char ***argv, int *argc, int *envchanged)
37{
38 const char **orig_argv = *argv;
39 while (*argc > 0) {
41 const char *cmd = (*argv)[0];
42 if (cmd[0] != '-')
43 break;
44 /*
46 * For legacy reasons, the "version" and "help"
47 * commands can be written with "--" prepended
48 * to make them look like flags.
49 */
50 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
51 break;
52 /*
54 * Check remaining flags.
55 */
56 if (skip_prefix(cmd, "--exec-path", &cmd)) {
57 if (*cmd == '=')
58 git_set_argv_exec_path(cmd + 1);
59 else {
60 puts(git_exec_path());
61 exit(0);
62 }
63 } else if (!strcmp(cmd, "--html-path")) {
64 puts(system_path(GIT_HTML_PATH));
65 exit(0);
66 } else if (!strcmp(cmd, "--man-path")) {
67 puts(system_path(GIT_MAN_PATH));
68 exit(0);
69 } else if (!strcmp(cmd, "--info-path")) {
70 puts(system_path(GIT_INFO_PATH));
71 exit(0);
72 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
73 use_pager = 1;
74 } else if (!strcmp(cmd, "--no-pager")) {
75 use_pager = 0;
76 if (envchanged)
77 *envchanged = 1;
78 } else if (!strcmp(cmd, "--no-replace-objects")) {
79 check_replace_refs = 0;
80 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
81 if (envchanged)
82 *envchanged = 1;
83 } else if (!strcmp(cmd, "--git-dir")) {
84 if (*argc < 2) {
85 fprintf(stderr, "No directory given for --git-dir.\n" );
86 usage(git_usage_string);
87 }
88 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
89 if (envchanged)
90 *envchanged = 1;
91 (*argv)++;
92 (*argc)--;
93 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
94 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
95 if (envchanged)
96 *envchanged = 1;
97 } else if (!strcmp(cmd, "--namespace")) {
98 if (*argc < 2) {
99 fprintf(stderr, "No namespace given for --namespace.\n" );
100 usage(git_usage_string);
101 }
102 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
103 if (envchanged)
104 *envchanged = 1;
105 (*argv)++;
106 (*argc)--;
107 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
108 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
109 if (envchanged)
110 *envchanged = 1;
111 } else if (!strcmp(cmd, "--work-tree")) {
112 if (*argc < 2) {
113 fprintf(stderr, "No directory given for --work-tree.\n" );
114 usage(git_usage_string);
115 }
116 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
117 if (envchanged)
118 *envchanged = 1;
119 (*argv)++;
120 (*argc)--;
121 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
122 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
123 if (envchanged)
124 *envchanged = 1;
125 } else if (!strcmp(cmd, "--super-prefix")) {
126 if (*argc < 2) {
127 fprintf(stderr, "No prefix given for --super-prefix.\n" );
128 usage(git_usage_string);
129 }
130 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
131 if (envchanged)
132 *envchanged = 1;
133 (*argv)++;
134 (*argc)--;
135 } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
136 setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
137 if (envchanged)
138 *envchanged = 1;
139 } else if (!strcmp(cmd, "--bare")) {
140 char *cwd = xgetcwd();
141 is_bare_repository_cfg = 1;
142 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
143 free(cwd);
144 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
145 if (envchanged)
146 *envchanged = 1;
147 } else if (!strcmp(cmd, "-c")) {
148 if (*argc < 2) {
149 fprintf(stderr, "-c expects a configuration string\n" );
150 usage(git_usage_string);
151 }
152 git_config_push_parameter((*argv)[1]);
153 (*argv)++;
154 (*argc)--;
155 } else if (!strcmp(cmd, "--literal-pathspecs")) {
156 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
157 if (envchanged)
158 *envchanged = 1;
159 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
160 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
161 if (envchanged)
162 *envchanged = 1;
163 } else if (!strcmp(cmd, "--glob-pathspecs")) {
164 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
165 if (envchanged)
166 *envchanged = 1;
167 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
168 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
169 if (envchanged)
170 *envchanged = 1;
171 } else if (!strcmp(cmd, "--icase-pathspecs")) {
172 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
173 if (envchanged)
174 *envchanged = 1;
175 } else if (!strcmp(cmd, "--shallow-file")) {
176 (*argv)++;
177 (*argc)--;
178 set_alternate_shallow_file((*argv)[0], 1);
179 if (envchanged)
180 *envchanged = 1;
181 } else if (!strcmp(cmd, "-C")) {
182 if (*argc < 2) {
183 fprintf(stderr, "No directory given for -C.\n" );
184 usage(git_usage_string);
185 }
186 if ((*argv)[1][0]) {
187 if (chdir((*argv)[1]))
188 die_errno("Cannot change to '%s'", (*argv)[1]);
189 if (envchanged)
190 *envchanged = 1;
191 }
192 (*argv)++;
193 (*argc)--;
194 } else if (!strcmp(cmd, "--list-builtins")) {
195 list_builtins();
196 exit(0);
197 } else {
198 fprintf(stderr, "Unknown option: %s\n", cmd);
199 usage(git_usage_string);
200 }
201 (*argv)++;
203 (*argc)--;
204 }
205 return (*argv) - orig_argv;
206}
207static int handle_alias(int *argcp, const char ***argv)
209{
210 int envchanged = 0, ret = 0, saved_errno = errno;
211 int count, option_count;
212 const char **new_argv;
213 const char *alias_command;
214 char *alias_string;
215 alias_command = (*argv)[0];
217 alias_string = alias_lookup(alias_command);
218 if (alias_string) {
219 if (alias_string[0] == '!') {
220 struct child_process child = CHILD_PROCESS_INIT;
221 int nongit_ok;
222 /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
224 setup_git_directory_gently(&nongit_ok);
225 commit_pager_choice();
227 child.use_shell = 1;
229 argv_array_push(&child.args, alias_string + 1);
230 argv_array_pushv(&child.args, (*argv) + 1);
231 ret = run_command(&child);
233 if (ret >= 0) /* normal exit */
234 exit(ret);
235 die_errno("While expanding alias '%s': '%s'",
237 alias_command, alias_string + 1);
238 }
239 count = split_cmdline(alias_string, &new_argv);
240 if (count < 0)
241 die("Bad alias.%s string: %s", alias_command,
242 split_cmdline_strerror(count));
243 option_count = handle_options(&new_argv, &count, &envchanged);
244 if (envchanged)
245 die("alias '%s' changes environment variables\n"
246 "You can use '!git' in the alias to do this.",
247 alias_command);
248 memmove(new_argv - option_count, new_argv,
249 count * sizeof(char *));
250 new_argv -= option_count;
251 if (count < 1)
253 die("empty alias for %s", alias_command);
254 if (!strcmp(alias_command, new_argv[0]))
256 die("recursive alias: %s", alias_command);
257 trace_argv_printf(new_argv,
259 "trace: alias expansion: %s =>",
260 alias_command);
261 REALLOC_ARRAY(new_argv, count + *argcp);
263 /* insert after command name */
264 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
265 *argv = new_argv;
267 *argcp += count - 1;
268 ret = 1;
270 }
271 errno = saved_errno;
273 return ret;
275}
276#define RUN_SETUP (1<<0)
278#define RUN_SETUP_GENTLY (1<<1)
279#define USE_PAGER (1<<2)
280/*
281 * require working tree to be present -- anything uses this needs
282 * RUN_SETUP for reading from the configuration file.
283 */
284#define NEED_WORK_TREE (1<<3)
285#define SUPPORT_SUPER_PREFIX (1<<4)
286#define DELAY_PAGER_CONFIG (1<<5)
287struct cmd_struct {
289 const char *cmd;
290 int (*fn)(int, const char **, const char *);
291 int option;
292};
293static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
295{
296 int status, help;
297 struct stat st;
298 const char *prefix;
299 prefix = NULL;
301 help = argc == 2 && !strcmp(argv[1], "-h");
302 if (!help) {
303 if (p->option & RUN_SETUP)
304 prefix = setup_git_directory();
305 else if (p->option & RUN_SETUP_GENTLY) {
306 int nongit_ok;
307 prefix = setup_git_directory_gently(&nongit_ok);
308 }
309 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
311 !(p->option & DELAY_PAGER_CONFIG))
312 use_pager = check_pager_config(p->cmd);
313 if (use_pager == -1 && p->option & USE_PAGER)
314 use_pager = 1;
315 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
317 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
318 trace_repo_setup(prefix);
319 }
320 commit_pager_choice();
321 if (!help && get_super_prefix()) {
323 if (!(p->option & SUPPORT_SUPER_PREFIX))
324 die("%s doesn't support --super-prefix", p->cmd);
325 }
326 if (!help && p->option & NEED_WORK_TREE)
328 setup_work_tree();
329 trace_argv_printf(argv, "trace: built-in: git");
331 status = p->fn(argc, argv, prefix);
333 if (status)
334 return status;
335 /* Somebody closed stdout? */
337 if (fstat(fileno(stdout), &st))
338 return 0;
339 /* Ignore write errors for pipes and sockets.. */
340 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
341 return 0;
342 /* Check for ENOSPC and EIO errors.. */
344 if (fflush(stdout))
345 die_errno("write failure on standard output");
346 if (ferror(stdout))
347 die("unknown write failure on standard output");
348 if (fclose(stdout))
349 die_errno("close failed on standard output");
350 return 0;
351}
352static struct cmd_struct commands[] = {
354 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
355 { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
356 { "annotate", cmd_annotate, RUN_SETUP },
357 { "apply", cmd_apply, RUN_SETUP_GENTLY },
358 { "archive", cmd_archive, RUN_SETUP_GENTLY },
359 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
360 { "blame", cmd_blame, RUN_SETUP },
361 { "branch", cmd_branch, RUN_SETUP },
362 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
363 { "cat-file", cmd_cat_file, RUN_SETUP },
364 { "check-attr", cmd_check_attr, RUN_SETUP },
365 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
366 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
367 { "check-ref-format", cmd_check_ref_format },
368 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
369 { "checkout-index", cmd_checkout_index,
370 RUN_SETUP | NEED_WORK_TREE},
371 { "cherry", cmd_cherry, RUN_SETUP },
372 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
373 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
374 { "clone", cmd_clone },
375 { "column", cmd_column, RUN_SETUP_GENTLY },
376 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
377 { "commit-tree", cmd_commit_tree, RUN_SETUP },
378 { "config", cmd_config, RUN_SETUP_GENTLY },
379 { "count-objects", cmd_count_objects, RUN_SETUP },
380 { "credential", cmd_credential, RUN_SETUP_GENTLY },
381 { "describe", cmd_describe, RUN_SETUP },
382 { "diff", cmd_diff },
383 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
384 { "diff-index", cmd_diff_index, RUN_SETUP },
385 { "diff-tree", cmd_diff_tree, RUN_SETUP },
386 { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
387 { "fast-export", cmd_fast_export, RUN_SETUP },
388 { "fetch", cmd_fetch, RUN_SETUP },
389 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
390 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
391 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
392 { "format-patch", cmd_format_patch, RUN_SETUP },
393 { "fsck", cmd_fsck, RUN_SETUP },
394 { "fsck-objects", cmd_fsck, RUN_SETUP },
395 { "gc", cmd_gc, RUN_SETUP },
396 { "get-tar-commit-id", cmd_get_tar_commit_id },
397 { "grep", cmd_grep, RUN_SETUP_GENTLY | SUPPORT_SUPER_PREFIX },
398 { "hash-object", cmd_hash_object },
399 { "help", cmd_help },
400 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
401 { "init", cmd_init_db },
402 { "init-db", cmd_init_db },
403 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
404 { "log", cmd_log, RUN_SETUP },
405 { "ls-files", cmd_ls_files, RUN_SETUP },
406 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
407 { "ls-tree", cmd_ls_tree, RUN_SETUP },
408 { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
409 { "mailsplit", cmd_mailsplit },
410 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
411 { "merge-base", cmd_merge_base, RUN_SETUP },
412 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
413 { "merge-index", cmd_merge_index, RUN_SETUP },
414 { "merge-ours", cmd_merge_ours, RUN_SETUP },
415 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
416 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
417 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
418 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
419 { "merge-tree", cmd_merge_tree, RUN_SETUP },
420 { "mktag", cmd_mktag, RUN_SETUP },
421 { "mktree", cmd_mktree, RUN_SETUP },
422 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
423 { "name-rev", cmd_name_rev, RUN_SETUP },
424 { "notes", cmd_notes, RUN_SETUP },
425 { "pack-objects", cmd_pack_objects, RUN_SETUP },
426 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
427 { "pack-refs", cmd_pack_refs, RUN_SETUP },
428 { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY },
429 { "pickaxe", cmd_blame, RUN_SETUP },
430 { "prune", cmd_prune, RUN_SETUP },
431 { "prune-packed", cmd_prune_packed, RUN_SETUP },
432 { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
433 { "push", cmd_push, RUN_SETUP },
434 { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
435 { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
436 { "receive-pack", cmd_receive_pack },
437 { "reflog", cmd_reflog, RUN_SETUP },
438 { "remote", cmd_remote, RUN_SETUP },
439 { "remote-ext", cmd_remote_ext },
440 { "remote-fd", cmd_remote_fd },
441 { "repack", cmd_repack, RUN_SETUP },
442 { "replace", cmd_replace, RUN_SETUP },
443 { "rerere", cmd_rerere, RUN_SETUP },
444 { "reset", cmd_reset, RUN_SETUP },
445 { "rev-list", cmd_rev_list, RUN_SETUP },
446 { "rev-parse", cmd_rev_parse },
447 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
448 { "rm", cmd_rm, RUN_SETUP },
449 { "send-pack", cmd_send_pack, RUN_SETUP },
450 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
451 { "show", cmd_show, RUN_SETUP },
452 { "show-branch", cmd_show_branch, RUN_SETUP },
453 { "show-ref", cmd_show_ref, RUN_SETUP },
454 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
455 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
456 { "stripspace", cmd_stripspace },
457 { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX},
458 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
459 { "tag", cmd_tag, RUN_SETUP },
460 { "unpack-file", cmd_unpack_file, RUN_SETUP },
461 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
462 { "update-index", cmd_update_index, RUN_SETUP },
463 { "update-ref", cmd_update_ref, RUN_SETUP },
464 { "update-server-info", cmd_update_server_info, RUN_SETUP },
465 { "upload-archive", cmd_upload_archive },
466 { "upload-archive--writer", cmd_upload_archive_writer },
467 { "var", cmd_var, RUN_SETUP_GENTLY },
468 { "verify-commit", cmd_verify_commit, RUN_SETUP },
469 { "verify-pack", cmd_verify_pack },
470 { "verify-tag", cmd_verify_tag, RUN_SETUP },
471 { "version", cmd_version },
472 { "whatchanged", cmd_whatchanged, RUN_SETUP },
473 { "worktree", cmd_worktree, RUN_SETUP },
474 { "write-tree", cmd_write_tree, RUN_SETUP },
475};
476static struct cmd_struct *get_builtin(const char *s)
478{
479 int i;
480 for (i = 0; i < ARRAY_SIZE(commands); i++) {
481 struct cmd_struct *p = commands + i;
482 if (!strcmp(s, p->cmd))
483 return p;
484 }
485 return NULL;
486}
487int is_builtin(const char *s)
489{
490 return !!get_builtin(s);
491}
492static void list_builtins(void)
494{
495 int i;
496 for (i = 0; i < ARRAY_SIZE(commands); i++)
497 printf("%s\n", commands[i].cmd);
498}
499#ifdef STRIP_EXTENSION
501static void strip_extension(const char **argv)
502{
503 size_t len;
504 if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
506 argv[0] = xmemdupz(argv[0], len);
507}
508#else
509#define strip_extension(cmd)
510#endif
511static void handle_builtin(int argc, const char **argv)
513{
514 struct argv_array args = ARGV_ARRAY_INIT;
515 const char *cmd;
516 struct cmd_struct *builtin;
517 strip_extension(argv);
519 cmd = argv[0];
520 /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
522 if (argc > 1 && !strcmp(argv[1], "--help")) {
523 int i;
524 argv[1] = argv[0];
526 argv[0] = cmd = "help";
527 for (i = 0; i < argc; i++) {
529 argv_array_push(&args, argv[i]);
530 if (!i)
531 argv_array_push(&args, "--exclude-guides");
532 }
533 argc++;
535 argv = args.argv;
536 }
537 builtin = get_builtin(cmd);
539 if (builtin)
540 exit(run_builtin(builtin, argc, argv));
541 argv_array_clear(&args);
542}
543static void execv_dashed_external(const char **argv)
545{
546 struct child_process cmd = CHILD_PROCESS_INIT;
547 int status;
548 if (get_super_prefix())
550 die("%s doesn't support --super-prefix", argv[0]);
551 if (use_pager == -1)
553 use_pager = check_pager_config(argv[0]);
554 commit_pager_choice();
555 argv_array_pushf(&cmd.args, "git-%s", argv[0]);
557 argv_array_pushv(&cmd.args, argv + 1);
558 cmd.clean_on_exit = 1;
559 cmd.wait_after_clean = 1;
560 cmd.silent_exec_failure = 1;
561 trace_argv_printf(cmd.args.argv, "trace: exec:");
563 /*
565 * If we fail because the command is not found, it is
566 * OK to return. Otherwise, we just pass along the status code,
567 * or our usual generic code if we were not even able to exec
568 * the program.
569 */
570 status = run_command(&cmd);
571 if (status >= 0)
572 exit(status);
573 else if (errno != ENOENT)
574 exit(128);
575}
576static int run_argv(int *argcp, const char ***argv)
578{
579 int done_alias = 0;
580 while (1) {
582 /*
583 * If we tried alias and futzed with our environment,
584 * it no longer is safe to invoke builtins directly in
585 * general. We have to spawn them as dashed externals.
586 *
587 * NEEDSWORK: if we can figure out cases
588 * where it is safe to do, we can avoid spawning a new
589 * process.
590 */
591 if (!done_alias)
592 handle_builtin(*argcp, *argv);
593 /* .. then try the external ones */
595 execv_dashed_external(*argv);
596 /* It could be an alias -- this works around the insanity
598 * of overriding "git log" with "git show" by having
599 * alias.log = show
600 */
601 if (done_alias)
602 break;
603 if (!handle_alias(argcp, argv))
604 break;
605 done_alias = 1;
606 }
607 return done_alias;
609}
610int cmd_main(int argc, const char **argv)
612{
613 const char *cmd;
614 int done_help = 0;
615 cmd = argv[0];
617 if (!cmd)
618 cmd = "git-help";
619 else {
620 const char *slash = find_last_dir_sep(cmd);
621 if (slash)
622 cmd = slash + 1;
623 }
624 trace_command_performance(argv);
626 /*
628 * "git-xxxx" is the same as "git xxxx", but we obviously:
629 *
630 * - cannot take flags in between the "git" and the "xxxx".
631 * - cannot execute it externally (since it would just do
632 * the same thing over again)
633 *
634 * So we just directly call the builtin handler, and die if
635 * that one cannot handle it.
636 */
637 if (skip_prefix(cmd, "git-", &cmd)) {
638 argv[0] = cmd;
639 handle_builtin(argc, argv);
640 die("cannot handle %s as a builtin", cmd);
641 }
642 /* Look for flags.. */
644 argv++;
645 argc--;
646 handle_options(&argv, &argc, NULL);
647 if (argc > 0) {
648 /* translate --help and --version into commands */
649 skip_prefix(argv[0], "--", &argv[0]);
650 } else {
651 /* The user didn't specify a command; give them help */
652 commit_pager_choice();
653 printf("usage: %s\n\n", git_usage_string);
654 list_common_cmds_help();
655 printf("\n%s\n", _(git_more_info_string));
656 exit(1);
657 }
658 cmd = argv[0];
659 /*
661 * We use PATH to find git commands, but we prepend some higher
662 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
663 * environment, and the $(gitexecdir) from the Makefile at build
664 * time.
665 */
666 setup_path();
667 while (1) {
669 int was_alias = run_argv(&argc, &argv);
670 if (errno != ENOENT)
671 break;
672 if (was_alias) {
673 fprintf(stderr, "Expansion of alias '%s' failed; "
674 "'%s' is not a git command\n",
675 cmd, argv[0]);
676 exit(1);
677 }
678 if (!done_help) {
679 cmd = argv[0] = help_unknown_cmd(cmd);
680 done_help = 1;
681 } else
682 break;
683 }
684 fprintf(stderr, "Failed to run command '%s': %s\n",
686 cmd, strerror(errno));
687 return 1;
689}