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 "See 'git help <command>' for more information on a specific command.";
17static struct startup_info git_startup_info;
19static int use_pager = -1;
20struct pager_config {
21 const char *cmd;
22 int want;
23 char *value;
24};
25static int pager_command_config(const char *var, const char *value, void *data)
27{
28 struct pager_config *c = data;
29 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) {
30 int b = git_config_maybe_bool(var, value);
31 if (b >= 0)
32 c->want = b;
33 else {
34 c->want = 1;
35 c->value = xstrdup(value);
36 }
37 }
38 return 0;
39}
40/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
42int check_pager_config(const char *cmd)
43{
44 struct pager_config c;
45 c.cmd = cmd;
46 c.want = -1;
47 c.value = NULL;
48 git_config(pager_command_config, &c);
49 if (c.value)
50 pager_program = c.value;
51 return c.want;
52}
53static void commit_pager_choice(void) {
55 switch (use_pager) {
56 case 0:
57 setenv("GIT_PAGER", "cat", 1);
58 break;
59 case 1:
60 setup_pager();
61 break;
62 default:
63 break;
64 }
65}
66static int handle_options(const char ***argv, int *argc, int *envchanged)
68{
69 int handled = 0;
70 while (*argc > 0) {
72 const char *cmd = (*argv)[0];
73 if (cmd[0] != '-')
74 break;
75 /*
77 * For legacy reasons, the "version" and "help"
78 * commands can be written with "--" prepended
79 * to make them look like flags.
80 */
81 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
82 break;
83 /*
85 * Check remaining flags.
86 */
87 if (!prefixcmp(cmd, "--exec-path")) {
88 cmd += 11;
89 if (*cmd == '=')
90 git_set_argv_exec_path(cmd + 1);
91 else {
92 puts(git_exec_path());
93 exit(0);
94 }
95 } else if (!strcmp(cmd, "--html-path")) {
96 puts(system_path(GIT_HTML_PATH));
97 exit(0);
98 } else if (!strcmp(cmd, "--man-path")) {
99 puts(system_path(GIT_MAN_PATH));
100 exit(0);
101 } else if (!strcmp(cmd, "--info-path")) {
102 puts(system_path(GIT_INFO_PATH));
103 exit(0);
104 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
105 use_pager = 1;
106 } else if (!strcmp(cmd, "--no-pager")) {
107 use_pager = 0;
108 if (envchanged)
109 *envchanged = 1;
110 } else if (!strcmp(cmd, "--no-replace-objects")) {
111 read_replace_refs = 0;
112 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
113 if (envchanged)
114 *envchanged = 1;
115 } else if (!strcmp(cmd, "--git-dir")) {
116 if (*argc < 2) {
117 fprintf(stderr, "No directory given for --git-dir.\n" );
118 usage(git_usage_string);
119 }
120 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
121 if (envchanged)
122 *envchanged = 1;
123 (*argv)++;
124 (*argc)--;
125 handled++;
126 } else if (!prefixcmp(cmd, "--git-dir=")) {
127 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
128 if (envchanged)
129 *envchanged = 1;
130 } else if (!strcmp(cmd, "--namespace")) {
131 if (*argc < 2) {
132 fprintf(stderr, "No namespace given for --namespace.\n" );
133 usage(git_usage_string);
134 }
135 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
136 if (envchanged)
137 *envchanged = 1;
138 (*argv)++;
139 (*argc)--;
140 } else if (!prefixcmp(cmd, "--namespace=")) {
141 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
142 if (envchanged)
143 *envchanged = 1;
144 } else if (!strcmp(cmd, "--work-tree")) {
145 if (*argc < 2) {
146 fprintf(stderr, "No directory given for --work-tree.\n" );
147 usage(git_usage_string);
148 }
149 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
150 if (envchanged)
151 *envchanged = 1;
152 (*argv)++;
153 (*argc)--;
154 } else if (!prefixcmp(cmd, "--work-tree=")) {
155 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
156 if (envchanged)
157 *envchanged = 1;
158 } else if (!strcmp(cmd, "--bare")) {
159 static char git_dir[PATH_MAX+1];
160 is_bare_repository_cfg = 1;
161 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
162 if (envchanged)
163 *envchanged = 1;
164 } else if (!strcmp(cmd, "-c")) {
165 if (*argc < 2) {
166 fprintf(stderr, "-c expects a configuration string\n" );
167 usage(git_usage_string);
168 }
169 git_config_push_parameter((*argv)[1]);
170 (*argv)++;
171 (*argc)--;
172 } else {
173 fprintf(stderr, "Unknown option: %s\n", cmd);
174 usage(git_usage_string);
175 }
176 (*argv)++;
178 (*argc)--;
179 handled++;
180 }
181 return handled;
182}
183static int handle_alias(int *argcp, const char ***argv)
185{
186 int envchanged = 0, ret = 0, saved_errno = errno;
187 const char *subdir;
188 int count, option_count;
189 const char **new_argv;
190 const char *alias_command;
191 char *alias_string;
192 int unused_nongit;
193 subdir = setup_git_directory_gently(&unused_nongit);
195 alias_command = (*argv)[0];
197 alias_string = alias_lookup(alias_command);
198 if (alias_string) {
199 if (alias_string[0] == '!') {
200 const char **alias_argv;
201 int argc = *argcp, i;
202 struct strbuf sb = STRBUF_INIT;
203 const char *env[2];
204 commit_pager_choice();
206 /* build alias_argv */
208 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
209 alias_argv[0] = alias_string + 1;
210 for (i = 1; i < argc; ++i)
211 alias_argv[i] = (*argv)[i];
212 alias_argv[argc] = NULL;
213 strbuf_addstr(&sb, "GIT_PREFIX=");
215 if (subdir)
216 strbuf_addstr(&sb, subdir);
217 env[0] = sb.buf;
218 env[1] = NULL;
219 ret = run_command_v_opt_cd_env(alias_argv, RUN_USING_SHELL, NULL, env);
220 strbuf_release(&sb);
221 if (ret >= 0) /* normal exit */
222 exit(ret);
223 die_errno("While expanding alias '%s': '%s'",
225 alias_command, alias_string + 1);
226 }
227 count = split_cmdline(alias_string, &new_argv);
228 if (count < 0)
229 die("Bad alias.%s string: %s", alias_command,
230 split_cmdline_strerror(count));
231 option_count = handle_options(&new_argv, &count, &envchanged);
232 if (envchanged)
233 die("alias '%s' changes environment variables\n"
234 "You can use '!git' in the alias to do this.",
235 alias_command);
236 memmove(new_argv - option_count, new_argv,
237 count * sizeof(char *));
238 new_argv -= option_count;
239 if (count < 1)
241 die("empty alias for %s", alias_command);
242 if (!strcmp(alias_command, new_argv[0]))
244 die("recursive alias: %s", alias_command);
245 trace_argv_printf(new_argv,
247 "trace: alias expansion: %s =>",
248 alias_command);
249 new_argv = xrealloc(new_argv, sizeof(char *) *
251 (count + *argcp));
252 /* insert after command name */
253 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
254 *argv = new_argv;
256 *argcp += count - 1;
257 ret = 1;
259 }
260 if (subdir && chdir(subdir))
262 die_errno("Cannot change to '%s'", subdir);
263 errno = saved_errno;
265 return ret;
267}
268const char git_version_string[] = GIT_VERSION;
270#define RUN_SETUP (1<<0)
272#define RUN_SETUP_GENTLY (1<<1)
273#define USE_PAGER (1<<2)
274/*
275 * require working tree to be present -- anything uses this needs
276 * RUN_SETUP for reading from the configuration file.
277 */
278#define NEED_WORK_TREE (1<<3)
279struct cmd_struct {
281 const char *cmd;
282 int (*fn)(int, const char **, const char *);
283 int option;
284};
285static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
287{
288 int status, help;
289 struct stat st;
290 const char *prefix;
291 prefix = NULL;
293 help = argc == 2 && !strcmp(argv[1], "-h");
294 if (!help) {
295 if (p->option & RUN_SETUP)
296 prefix = setup_git_directory();
297 if (p->option & RUN_SETUP_GENTLY) {
298 int nongit_ok;
299 prefix = setup_git_directory_gently(&nongit_ok);
300 }
301 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
303 use_pager = check_pager_config(p->cmd);
304 if (use_pager == -1 && p->option & USE_PAGER)
305 use_pager = 1;
306 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
308 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
309 trace_repo_setup(prefix);
310 }
311 commit_pager_choice();
312 if (!help && p->option & NEED_WORK_TREE)
314 setup_work_tree();
315 trace_argv_printf(argv, "trace: built-in: git");
317 status = p->fn(argc, argv, prefix);
319 if (status)
320 return status;
321 /* Somebody closed stdout? */
323 if (fstat(fileno(stdout), &st))
324 return 0;
325 /* Ignore write errors for pipes and sockets.. */
326 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
327 return 0;
328 /* Check for ENOSPC and EIO errors.. */
330 if (fflush(stdout))
331 die_errno("write failure on standard output");
332 if (ferror(stdout))
333 die("unknown write failure on standard output");
334 if (fclose(stdout))
335 die_errno("close failed on standard output");
336 return 0;
337}
338static void handle_internal_command(int argc, const char **argv)
340{
341 const char *cmd = argv[0];
342 static struct cmd_struct commands[] = {
343 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
344 { "annotate", cmd_annotate, RUN_SETUP },
345 { "apply", cmd_apply, RUN_SETUP_GENTLY },
346 { "archive", cmd_archive },
347 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
348 { "blame", cmd_blame, RUN_SETUP },
349 { "branch", cmd_branch, RUN_SETUP },
350 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
351 { "cat-file", cmd_cat_file, RUN_SETUP },
352 { "check-attr", cmd_check_attr, RUN_SETUP },
353 { "check-ref-format", cmd_check_ref_format },
354 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
355 { "checkout-index", cmd_checkout_index,
356 RUN_SETUP | NEED_WORK_TREE},
357 { "cherry", cmd_cherry, RUN_SETUP },
358 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
359 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
360 { "clone", cmd_clone },
361 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
362 { "commit-tree", cmd_commit_tree, RUN_SETUP },
363 { "config", cmd_config, RUN_SETUP_GENTLY },
364 { "count-objects", cmd_count_objects, RUN_SETUP },
365 { "describe", cmd_describe, RUN_SETUP },
366 { "diff", cmd_diff },
367 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
368 { "diff-index", cmd_diff_index, RUN_SETUP },
369 { "diff-tree", cmd_diff_tree, RUN_SETUP },
370 { "fast-export", cmd_fast_export, RUN_SETUP },
371 { "fetch", cmd_fetch, RUN_SETUP },
372 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
373 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
374 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
375 { "format-patch", cmd_format_patch, RUN_SETUP },
376 { "fsck", cmd_fsck, RUN_SETUP },
377 { "fsck-objects", cmd_fsck, RUN_SETUP },
378 { "gc", cmd_gc, RUN_SETUP },
379 { "get-tar-commit-id", cmd_get_tar_commit_id },
380 { "grep", cmd_grep, RUN_SETUP_GENTLY },
381 { "hash-object", cmd_hash_object },
382 { "help", cmd_help },
383 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
384 { "init", cmd_init_db },
385 { "init-db", cmd_init_db },
386 { "log", cmd_log, RUN_SETUP },
387 { "ls-files", cmd_ls_files, RUN_SETUP },
388 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
389 { "ls-tree", cmd_ls_tree, RUN_SETUP },
390 { "mailinfo", cmd_mailinfo },
391 { "mailsplit", cmd_mailsplit },
392 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
393 { "merge-base", cmd_merge_base, RUN_SETUP },
394 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
395 { "merge-index", cmd_merge_index, RUN_SETUP },
396 { "merge-ours", cmd_merge_ours, RUN_SETUP },
397 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
398 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
399 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
400 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
401 { "merge-tree", cmd_merge_tree, RUN_SETUP },
402 { "mktag", cmd_mktag, RUN_SETUP },
403 { "mktree", cmd_mktree, RUN_SETUP },
404 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
405 { "name-rev", cmd_name_rev, RUN_SETUP },
406 { "notes", cmd_notes, RUN_SETUP },
407 { "pack-objects", cmd_pack_objects, RUN_SETUP },
408 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
409 { "pack-refs", cmd_pack_refs, RUN_SETUP },
410 { "patch-id", cmd_patch_id },
411 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
412 { "pickaxe", cmd_blame, RUN_SETUP },
413 { "prune", cmd_prune, RUN_SETUP },
414 { "prune-packed", cmd_prune_packed, RUN_SETUP },
415 { "push", cmd_push, RUN_SETUP },
416 { "read-tree", cmd_read_tree, RUN_SETUP },
417 { "receive-pack", cmd_receive_pack },
418 { "reflog", cmd_reflog, RUN_SETUP },
419 { "remote", cmd_remote, RUN_SETUP },
420 { "remote-ext", cmd_remote_ext },
421 { "remote-fd", cmd_remote_fd },
422 { "replace", cmd_replace, RUN_SETUP },
423 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
424 { "rerere", cmd_rerere, RUN_SETUP },
425 { "reset", cmd_reset, RUN_SETUP },
426 { "rev-list", cmd_rev_list, RUN_SETUP },
427 { "rev-parse", cmd_rev_parse },
428 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
429 { "rm", cmd_rm, RUN_SETUP },
430 { "send-pack", cmd_send_pack, RUN_SETUP },
431 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
432 { "show", cmd_show, RUN_SETUP },
433 { "show-branch", cmd_show_branch, RUN_SETUP },
434 { "show-ref", cmd_show_ref, RUN_SETUP },
435 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
436 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
437 { "stripspace", cmd_stripspace },
438 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
439 { "tag", cmd_tag, RUN_SETUP },
440 { "tar-tree", cmd_tar_tree },
441 { "unpack-file", cmd_unpack_file, RUN_SETUP },
442 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
443 { "update-index", cmd_update_index, RUN_SETUP },
444 { "update-ref", cmd_update_ref, RUN_SETUP },
445 { "update-server-info", cmd_update_server_info, RUN_SETUP },
446 { "upload-archive", cmd_upload_archive },
447 { "var", cmd_var, RUN_SETUP_GENTLY },
448 { "verify-pack", cmd_verify_pack },
449 { "verify-tag", cmd_verify_tag, RUN_SETUP },
450 { "version", cmd_version },
451 { "whatchanged", cmd_whatchanged, RUN_SETUP },
452 { "write-tree", cmd_write_tree, RUN_SETUP },
453 };
454 int i;
455 static const char ext[] = STRIP_EXTENSION;
456 if (sizeof(ext) > 1) {
458 i = strlen(argv[0]) - strlen(ext);
459 if (i > 0 && !strcmp(argv[0] + i, ext)) {
460 char *argv0 = xstrdup(argv[0]);
461 argv[0] = cmd = argv0;
462 argv0[i] = '\0';
463 }
464 }
465 /* Turn "git cmd --help" into "git help cmd" */
467 if (argc > 1 && !strcmp(argv[1], "--help")) {
468 argv[1] = argv[0];
469 argv[0] = cmd = "help";
470 }
471 for (i = 0; i < ARRAY_SIZE(commands); i++) {
473 struct cmd_struct *p = commands+i;
474 if (strcmp(p->cmd, cmd))
475 continue;
476 exit(run_builtin(p, argc, argv));
477 }
478}
479static void execv_dashed_external(const char **argv)
481{
482 struct strbuf cmd = STRBUF_INIT;
483 const char *tmp;
484 int status;
485 commit_pager_choice();
487 strbuf_addf(&cmd, "git-%s", argv[0]);
489 /*
491 * argv[0] must be the git command, but the argv array
492 * belongs to the caller, and may be reused in
493 * subsequent loop iterations. Save argv[0] and
494 * restore it on error.
495 */
496 tmp = argv[0];
497 argv[0] = cmd.buf;
498 trace_argv_printf(argv, "trace: exec:");
500 /*
502 * if we fail because the command is not found, it is
503 * OK to return. Otherwise, we just pass along the status code.
504 */
505 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
506 if (status >= 0 || errno != ENOENT)
507 exit(status);
508 argv[0] = tmp;
510 strbuf_release(&cmd);
512}
513static int run_argv(int *argcp, const char ***argv)
515{
516 int done_alias = 0;
517 while (1) {
519 /* See if it's an internal command */
520 handle_internal_command(*argcp, *argv);
521 /* .. then try the external ones */
523 execv_dashed_external(*argv);
524 /* It could be an alias -- this works around the insanity
526 * of overriding "git log" with "git show" by having
527 * alias.log = show
528 */
529 if (done_alias || !handle_alias(argcp, argv))
530 break;
531 done_alias = 1;
532 }
533 return done_alias;
535}
536int main(int argc, const char **argv)
539{
540 const char *cmd;
541 startup_info = &git_startup_info;
543 cmd = git_extract_argv0_path(argv[0]);
545 if (!cmd)
546 cmd = "git-help";
547 /*
549 * "git-xxxx" is the same as "git xxxx", but we obviously:
550 *
551 * - cannot take flags in between the "git" and the "xxxx".
552 * - cannot execute it externally (since it would just do
553 * the same thing over again)
554 *
555 * So we just directly call the internal command handler, and
556 * die if that one cannot handle it.
557 */
558 if (!prefixcmp(cmd, "git-")) {
559 cmd += 4;
560 argv[0] = cmd;
561 handle_internal_command(argc, argv);
562 die("cannot handle %s internally", cmd);
563 }
564 /* Look for flags.. */
566 argv++;
567 argc--;
568 handle_options(&argv, &argc, NULL);
569 if (argc > 0) {
570 if (!prefixcmp(argv[0], "--"))
571 argv[0] += 2;
572 } else {
573 /* The user didn't specify a command; give them help */
574 commit_pager_choice();
575 printf("usage: %s\n\n", git_usage_string);
576 list_common_cmds_help();
577 printf("\n%s\n", git_more_info_string);
578 exit(1);
579 }
580 cmd = argv[0];
581 /*
583 * We use PATH to find git commands, but we prepend some higher
584 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
585 * environment, and the $(gitexecdir) from the Makefile at build
586 * time.
587 */
588 setup_path();
589 while (1) {
591 static int done_help = 0;
592 static int was_alias = 0;
593 was_alias = run_argv(&argc, &argv);
594 if (errno != ENOENT)
595 break;
596 if (was_alias) {
597 fprintf(stderr, "Expansion of alias '%s' failed; "
598 "'%s' is not a git command\n",
599 cmd, argv[0]);
600 exit(1);
601 }
602 if (!done_help) {
603 cmd = argv[0] = help_unknown_cmd(cmd);
604 done_help = 1;
605 } else
606 break;
607 }
608 fprintf(stderr, "Failed to run command '%s': %s\n",
610 cmd, strerror(errno));
611 return 1;
613}