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"
7const char git_usage_string[] =
9 "git [--version] [--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 " [-c name=value] [--help]\n"
13 " <command> [<args>]";
14const char git_more_info_string[] =
16 N_("See 'git help <command>' for more information on a specific command.");
17static struct startup_info git_startup_info;
19static int use_pager = -1;
20static void commit_pager_choice(void) {
22 switch (use_pager) {
23 case 0:
24 setenv("GIT_PAGER", "cat", 1);
25 break;
26 case 1:
27 setup_pager();
28 break;
29 default:
30 break;
31 }
32}
33static int handle_options(const char ***argv, int *argc, int *envchanged)
35{
36 const char **orig_argv = *argv;
37 while (*argc > 0) {
39 const char *cmd = (*argv)[0];
40 if (cmd[0] != '-')
41 break;
42 /*
44 * For legacy reasons, the "version" and "help"
45 * commands can be written with "--" prepended
46 * to make them look like flags.
47 */
48 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
49 break;
50 /*
52 * Check remaining flags.
53 */
54 if (!prefixcmp(cmd, "--exec-path")) {
55 cmd += 11;
56 if (*cmd == '=')
57 git_set_argv_exec_path(cmd + 1);
58 else {
59 puts(git_exec_path());
60 exit(0);
61 }
62 } else if (!strcmp(cmd, "--html-path")) {
63 puts(system_path(GIT_HTML_PATH));
64 exit(0);
65 } else if (!strcmp(cmd, "--man-path")) {
66 puts(system_path(GIT_MAN_PATH));
67 exit(0);
68 } else if (!strcmp(cmd, "--info-path")) {
69 puts(system_path(GIT_INFO_PATH));
70 exit(0);
71 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
72 use_pager = 1;
73 } else if (!strcmp(cmd, "--no-pager")) {
74 use_pager = 0;
75 if (envchanged)
76 *envchanged = 1;
77 } else if (!strcmp(cmd, "--no-replace-objects")) {
78 read_replace_refs = 0;
79 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
80 if (envchanged)
81 *envchanged = 1;
82 } else if (!strcmp(cmd, "--git-dir")) {
83 if (*argc < 2) {
84 fprintf(stderr, "No directory given for --git-dir.\n" );
85 usage(git_usage_string);
86 }
87 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
88 if (envchanged)
89 *envchanged = 1;
90 (*argv)++;
91 (*argc)--;
92 } else if (!prefixcmp(cmd, "--git-dir=")) {
93 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
94 if (envchanged)
95 *envchanged = 1;
96 } else if (!strcmp(cmd, "--namespace")) {
97 if (*argc < 2) {
98 fprintf(stderr, "No namespace given for --namespace.\n" );
99 usage(git_usage_string);
100 }
101 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
102 if (envchanged)
103 *envchanged = 1;
104 (*argv)++;
105 (*argc)--;
106 } else if (!prefixcmp(cmd, "--namespace=")) {
107 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
108 if (envchanged)
109 *envchanged = 1;
110 } else if (!strcmp(cmd, "--work-tree")) {
111 if (*argc < 2) {
112 fprintf(stderr, "No directory given for --work-tree.\n" );
113 usage(git_usage_string);
114 }
115 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
116 if (envchanged)
117 *envchanged = 1;
118 (*argv)++;
119 (*argc)--;
120 } else if (!prefixcmp(cmd, "--work-tree=")) {
121 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
122 if (envchanged)
123 *envchanged = 1;
124 } else if (!strcmp(cmd, "--bare")) {
125 static char git_dir[PATH_MAX+1];
126 is_bare_repository_cfg = 1;
127 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
128 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
129 if (envchanged)
130 *envchanged = 1;
131 } else if (!strcmp(cmd, "-c")) {
132 if (*argc < 2) {
133 fprintf(stderr, "-c expects a configuration string\n" );
134 usage(git_usage_string);
135 }
136 git_config_push_parameter((*argv)[1]);
137 (*argv)++;
138 (*argc)--;
139 } else {
140 fprintf(stderr, "Unknown option: %s\n", cmd);
141 usage(git_usage_string);
142 }
143 (*argv)++;
145 (*argc)--;
146 }
147 return (*argv) - orig_argv;
148}
149static int handle_alias(int *argcp, const char ***argv)
151{
152 int envchanged = 0, ret = 0, saved_errno = errno;
153 const char *subdir;
154 int count, option_count;
155 const char **new_argv;
156 const char *alias_command;
157 char *alias_string;
158 int unused_nongit;
159 subdir = setup_git_directory_gently(&unused_nongit);
161 alias_command = (*argv)[0];
163 alias_string = alias_lookup(alias_command);
164 if (alias_string) {
165 if (alias_string[0] == '!') {
166 const char **alias_argv;
167 int argc = *argcp, i;
168 commit_pager_choice();
170 /* build alias_argv */
172 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
173 alias_argv[0] = alias_string + 1;
174 for (i = 1; i < argc; ++i)
175 alias_argv[i] = (*argv)[i];
176 alias_argv[argc] = NULL;
177 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
179 if (ret >= 0) /* normal exit */
180 exit(ret);
181 die_errno("While expanding alias '%s': '%s'",
183 alias_command, alias_string + 1);
184 }
185 count = split_cmdline(alias_string, &new_argv);
186 if (count < 0)
187 die("Bad alias.%s string: %s", alias_command,
188 split_cmdline_strerror(count));
189 option_count = handle_options(&new_argv, &count, &envchanged);
190 if (envchanged)
191 die("alias '%s' changes environment variables\n"
192 "You can use '!git' in the alias to do this.",
193 alias_command);
194 memmove(new_argv - option_count, new_argv,
195 count * sizeof(char *));
196 new_argv -= option_count;
197 if (count < 1)
199 die("empty alias for %s", alias_command);
200 if (!strcmp(alias_command, new_argv[0]))
202 die("recursive alias: %s", alias_command);
203 trace_argv_printf(new_argv,
205 "trace: alias expansion: %s =>",
206 alias_command);
207 new_argv = xrealloc(new_argv, sizeof(char *) *
209 (count + *argcp));
210 /* insert after command name */
211 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
212 *argv = new_argv;
214 *argcp += count - 1;
215 ret = 1;
217 }
218 if (subdir && chdir(subdir))
220 die_errno("Cannot change to '%s'", subdir);
221 errno = saved_errno;
223 return ret;
225}
226#define RUN_SETUP (1<<0)
228#define RUN_SETUP_GENTLY (1<<1)
229#define USE_PAGER (1<<2)
230/*
231 * require working tree to be present -- anything uses this needs
232 * RUN_SETUP for reading from the configuration file.
233 */
234#define NEED_WORK_TREE (1<<3)
235struct cmd_struct {
237 const char *cmd;
238 int (*fn)(int, const char **, const char *);
239 int option;
240};
241static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
243{
244 int status, help;
245 struct stat st;
246 const char *prefix;
247 prefix = NULL;
249 help = argc == 2 && !strcmp(argv[1], "-h");
250 if (!help) {
251 if (p->option & RUN_SETUP)
252 prefix = setup_git_directory();
253 if (p->option & RUN_SETUP_GENTLY) {
254 int nongit_ok;
255 prefix = setup_git_directory_gently(&nongit_ok);
256 }
257 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
259 use_pager = check_pager_config(p->cmd);
260 if (use_pager == -1 && p->option & USE_PAGER)
261 use_pager = 1;
262 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
264 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
265 trace_repo_setup(prefix);
266 }
267 commit_pager_choice();
268 if (!help && p->option & NEED_WORK_TREE)
270 setup_work_tree();
271 trace_argv_printf(argv, "trace: built-in: git");
273 status = p->fn(argc, argv, prefix);
275 if (status)
276 return status;
277 /* Somebody closed stdout? */
279 if (fstat(fileno(stdout), &st))
280 return 0;
281 /* Ignore write errors for pipes and sockets.. */
282 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
283 return 0;
284 /* Check for ENOSPC and EIO errors.. */
286 if (fflush(stdout))
287 die_errno("write failure on standard output");
288 if (ferror(stdout))
289 die("unknown write failure on standard output");
290 if (fclose(stdout))
291 die_errno("close failed on standard output");
292 return 0;
293}
294static void handle_internal_command(int argc, const char **argv)
296{
297 const char *cmd = argv[0];
298 static struct cmd_struct commands[] = {
299 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
300 { "annotate", cmd_annotate, RUN_SETUP },
301 { "apply", cmd_apply, RUN_SETUP_GENTLY },
302 { "archive", cmd_archive },
303 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
304 { "blame", cmd_blame, RUN_SETUP },
305 { "branch", cmd_branch, RUN_SETUP },
306 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
307 { "cat-file", cmd_cat_file, RUN_SETUP },
308 { "check-attr", cmd_check_attr, RUN_SETUP },
309 { "check-ref-format", cmd_check_ref_format },
310 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
311 { "checkout-index", cmd_checkout_index,
312 RUN_SETUP | NEED_WORK_TREE},
313 { "cherry", cmd_cherry, RUN_SETUP },
314 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
315 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
316 { "clone", cmd_clone },
317 { "column", cmd_column, RUN_SETUP_GENTLY },
318 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
319 { "commit-tree", cmd_commit_tree, RUN_SETUP },
320 { "config", cmd_config, RUN_SETUP_GENTLY },
321 { "count-objects", cmd_count_objects, RUN_SETUP },
322 { "credential", cmd_credential, RUN_SETUP_GENTLY },
323 { "describe", cmd_describe, RUN_SETUP },
324 { "diff", cmd_diff },
325 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
326 { "diff-index", cmd_diff_index, RUN_SETUP },
327 { "diff-tree", cmd_diff_tree, RUN_SETUP },
328 { "fast-export", cmd_fast_export, RUN_SETUP },
329 { "fetch", cmd_fetch, RUN_SETUP },
330 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
331 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
332 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
333 { "format-patch", cmd_format_patch, RUN_SETUP },
334 { "fsck", cmd_fsck, RUN_SETUP },
335 { "fsck-objects", cmd_fsck, RUN_SETUP },
336 { "gc", cmd_gc, RUN_SETUP },
337 { "get-tar-commit-id", cmd_get_tar_commit_id },
338 { "grep", cmd_grep, RUN_SETUP_GENTLY },
339 { "hash-object", cmd_hash_object },
340 { "help", cmd_help },
341 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
342 { "init", cmd_init_db },
343 { "init-db", cmd_init_db },
344 { "log", cmd_log, RUN_SETUP },
345 { "ls-files", cmd_ls_files, RUN_SETUP },
346 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
347 { "ls-tree", cmd_ls_tree, RUN_SETUP },
348 { "mailinfo", cmd_mailinfo },
349 { "mailsplit", cmd_mailsplit },
350 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
351 { "merge-base", cmd_merge_base, RUN_SETUP },
352 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
353 { "merge-index", cmd_merge_index, RUN_SETUP },
354 { "merge-ours", cmd_merge_ours, RUN_SETUP },
355 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
356 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
357 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
358 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
359 { "merge-tree", cmd_merge_tree, RUN_SETUP },
360 { "mktag", cmd_mktag, RUN_SETUP },
361 { "mktree", cmd_mktree, RUN_SETUP },
362 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
363 { "name-rev", cmd_name_rev, RUN_SETUP },
364 { "notes", cmd_notes, RUN_SETUP },
365 { "pack-objects", cmd_pack_objects, RUN_SETUP },
366 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
367 { "pack-refs", cmd_pack_refs, RUN_SETUP },
368 { "patch-id", cmd_patch_id },
369 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
370 { "pickaxe", cmd_blame, RUN_SETUP },
371 { "prune", cmd_prune, RUN_SETUP },
372 { "prune-packed", cmd_prune_packed, RUN_SETUP },
373 { "push", cmd_push, RUN_SETUP },
374 { "read-tree", cmd_read_tree, RUN_SETUP },
375 { "receive-pack", cmd_receive_pack },
376 { "reflog", cmd_reflog, RUN_SETUP },
377 { "remote", cmd_remote, RUN_SETUP },
378 { "remote-ext", cmd_remote_ext },
379 { "remote-fd", cmd_remote_fd },
380 { "replace", cmd_replace, RUN_SETUP },
381 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
382 { "rerere", cmd_rerere, RUN_SETUP },
383 { "reset", cmd_reset, RUN_SETUP },
384 { "rev-list", cmd_rev_list, RUN_SETUP },
385 { "rev-parse", cmd_rev_parse },
386 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
387 { "rm", cmd_rm, RUN_SETUP },
388 { "send-pack", cmd_send_pack, RUN_SETUP },
389 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
390 { "show", cmd_show, RUN_SETUP },
391 { "show-branch", cmd_show_branch, RUN_SETUP },
392 { "show-ref", cmd_show_ref, RUN_SETUP },
393 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
394 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
395 { "stripspace", cmd_stripspace },
396 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
397 { "tag", cmd_tag, RUN_SETUP },
398 { "tar-tree", cmd_tar_tree },
399 { "unpack-file", cmd_unpack_file, RUN_SETUP },
400 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
401 { "update-index", cmd_update_index, RUN_SETUP },
402 { "update-ref", cmd_update_ref, RUN_SETUP },
403 { "update-server-info", cmd_update_server_info, RUN_SETUP },
404 { "upload-archive", cmd_upload_archive },
405 { "upload-archive--writer", cmd_upload_archive_writer },
406 { "var", cmd_var, RUN_SETUP_GENTLY },
407 { "verify-pack", cmd_verify_pack },
408 { "verify-tag", cmd_verify_tag, RUN_SETUP },
409 { "version", cmd_version },
410 { "whatchanged", cmd_whatchanged, RUN_SETUP },
411 { "write-tree", cmd_write_tree, RUN_SETUP },
412 };
413 int i;
414 static const char ext[] = STRIP_EXTENSION;
415 if (sizeof(ext) > 1) {
417 i = strlen(argv[0]) - strlen(ext);
418 if (i > 0 && !strcmp(argv[0] + i, ext)) {
419 char *argv0 = xstrdup(argv[0]);
420 argv[0] = cmd = argv0;
421 argv0[i] = '\0';
422 }
423 }
424 /* Turn "git cmd --help" into "git help cmd" */
426 if (argc > 1 && !strcmp(argv[1], "--help")) {
427 argv[1] = argv[0];
428 argv[0] = cmd = "help";
429 }
430 for (i = 0; i < ARRAY_SIZE(commands); i++) {
432 struct cmd_struct *p = commands+i;
433 if (strcmp(p->cmd, cmd))
434 continue;
435 exit(run_builtin(p, argc, argv));
436 }
437}
438static void execv_dashed_external(const char **argv)
440{
441 struct strbuf cmd = STRBUF_INIT;
442 const char *tmp;
443 int status;
444 if (use_pager == -1)
446 use_pager = check_pager_config(argv[0]);
447 commit_pager_choice();
448 strbuf_addf(&cmd, "git-%s", argv[0]);
450 /*
452 * argv[0] must be the git command, but the argv array
453 * belongs to the caller, and may be reused in
454 * subsequent loop iterations. Save argv[0] and
455 * restore it on error.
456 */
457 tmp = argv[0];
458 argv[0] = cmd.buf;
459 trace_argv_printf(argv, "trace: exec:");
461 /*
463 * if we fail because the command is not found, it is
464 * OK to return. Otherwise, we just pass along the status code.
465 */
466 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
467 if (status >= 0 || errno != ENOENT)
468 exit(status);
469 argv[0] = tmp;
471 strbuf_release(&cmd);
473}
474static int run_argv(int *argcp, const char ***argv)
476{
477 int done_alias = 0;
478 while (1) {
480 /* See if it's an internal command */
481 handle_internal_command(*argcp, *argv);
482 /* .. then try the external ones */
484 execv_dashed_external(*argv);
485 /* It could be an alias -- this works around the insanity
487 * of overriding "git log" with "git show" by having
488 * alias.log = show
489 */
490 if (done_alias || !handle_alias(argcp, argv))
491 break;
492 done_alias = 1;
493 }
494 return done_alias;
496}
497int main(int argc, const char **argv)
500{
501 const char *cmd;
502 startup_info = &git_startup_info;
504 cmd = git_extract_argv0_path(argv[0]);
506 if (!cmd)
507 cmd = "git-help";
508 git_setup_gettext();
510 /*
512 * "git-xxxx" is the same as "git xxxx", but we obviously:
513 *
514 * - cannot take flags in between the "git" and the "xxxx".
515 * - cannot execute it externally (since it would just do
516 * the same thing over again)
517 *
518 * So we just directly call the internal command handler, and
519 * die if that one cannot handle it.
520 */
521 if (!prefixcmp(cmd, "git-")) {
522 cmd += 4;
523 argv[0] = cmd;
524 handle_internal_command(argc, argv);
525 die("cannot handle %s internally", cmd);
526 }
527 /* Look for flags.. */
529 argv++;
530 argc--;
531 handle_options(&argv, &argc, NULL);
532 if (argc > 0) {
533 if (!prefixcmp(argv[0], "--"))
534 argv[0] += 2;
535 } else {
536 /* The user didn't specify a command; give them help */
537 commit_pager_choice();
538 printf("usage: %s\n\n", git_usage_string);
539 list_common_cmds_help();
540 printf("\n%s\n", git_more_info_string);
541 exit(1);
542 }
543 cmd = argv[0];
544 /*
546 * We use PATH to find git commands, but we prepend some higher
547 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
548 * environment, and the $(gitexecdir) from the Makefile at build
549 * time.
550 */
551 setup_path();
552 while (1) {
554 static int done_help = 0;
555 static int was_alias = 0;
556 was_alias = run_argv(&argc, &argv);
557 if (errno != ENOENT)
558 break;
559 if (was_alias) {
560 fprintf(stderr, "Expansion of alias '%s' failed; "
561 "'%s' is not a git command\n",
562 cmd, argv[0]);
563 exit(1);
564 }
565 if (!done_help) {
566 cmd = argv[0] = help_unknown_cmd(cmd);
567 done_help = 1;
568 } else
569 break;
570 }
571 fprintf(stderr, "Failed to run command '%s': %s\n",
573 cmd, strerror(errno));
574 return 1;
576}