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;
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 const char **orig_argv = *argv;
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 } else if (!prefixcmp(cmd, "--git-dir=")) {
126 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
127 if (envchanged)
128 *envchanged = 1;
129 } else if (!strcmp(cmd, "--namespace")) {
130 if (*argc < 2) {
131 fprintf(stderr, "No namespace given for --namespace.\n" );
132 usage(git_usage_string);
133 }
134 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
135 if (envchanged)
136 *envchanged = 1;
137 (*argv)++;
138 (*argc)--;
139 } else if (!prefixcmp(cmd, "--namespace=")) {
140 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
141 if (envchanged)
142 *envchanged = 1;
143 } else if (!strcmp(cmd, "--work-tree")) {
144 if (*argc < 2) {
145 fprintf(stderr, "No directory given for --work-tree.\n" );
146 usage(git_usage_string);
147 }
148 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
149 if (envchanged)
150 *envchanged = 1;
151 (*argv)++;
152 (*argc)--;
153 } else if (!prefixcmp(cmd, "--work-tree=")) {
154 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
155 if (envchanged)
156 *envchanged = 1;
157 } else if (!strcmp(cmd, "--bare")) {
158 static char git_dir[PATH_MAX+1];
159 is_bare_repository_cfg = 1;
160 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
161 if (envchanged)
162 *envchanged = 1;
163 } else if (!strcmp(cmd, "-c")) {
164 if (*argc < 2) {
165 fprintf(stderr, "-c expects a configuration string\n" );
166 usage(git_usage_string);
167 }
168 git_config_push_parameter((*argv)[1]);
169 (*argv)++;
170 (*argc)--;
171 } else {
172 fprintf(stderr, "Unknown option: %s\n", cmd);
173 usage(git_usage_string);
174 }
175 (*argv)++;
177 (*argc)--;
178 }
179 return (*argv) - orig_argv;
180}
181static int handle_alias(int *argcp, const char ***argv)
183{
184 int envchanged = 0, ret = 0, saved_errno = errno;
185 const char *subdir;
186 int count, option_count;
187 const char **new_argv;
188 const char *alias_command;
189 char *alias_string;
190 int unused_nongit;
191 subdir = setup_git_directory_gently(&unused_nongit);
193 alias_command = (*argv)[0];
195 alias_string = alias_lookup(alias_command);
196 if (alias_string) {
197 if (alias_string[0] == '!') {
198 const char **alias_argv;
199 int argc = *argcp, i;
200 commit_pager_choice();
202 /* build alias_argv */
204 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
205 alias_argv[0] = alias_string + 1;
206 for (i = 1; i < argc; ++i)
207 alias_argv[i] = (*argv)[i];
208 alias_argv[argc] = NULL;
209 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
211 if (ret >= 0) /* normal exit */
212 exit(ret);
213 die_errno("While expanding alias '%s': '%s'",
215 alias_command, alias_string + 1);
216 }
217 count = split_cmdline(alias_string, &new_argv);
218 if (count < 0)
219 die("Bad alias.%s string: %s", alias_command,
220 split_cmdline_strerror(count));
221 option_count = handle_options(&new_argv, &count, &envchanged);
222 if (envchanged)
223 die("alias '%s' changes environment variables\n"
224 "You can use '!git' in the alias to do this.",
225 alias_command);
226 memmove(new_argv - option_count, new_argv,
227 count * sizeof(char *));
228 new_argv -= option_count;
229 if (count < 1)
231 die("empty alias for %s", alias_command);
232 if (!strcmp(alias_command, new_argv[0]))
234 die("recursive alias: %s", alias_command);
235 trace_argv_printf(new_argv,
237 "trace: alias expansion: %s =>",
238 alias_command);
239 new_argv = xrealloc(new_argv, sizeof(char *) *
241 (count + *argcp));
242 /* insert after command name */
243 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
244 *argv = new_argv;
246 *argcp += count - 1;
247 ret = 1;
249 }
250 if (subdir && chdir(subdir))
252 die_errno("Cannot change to '%s'", subdir);
253 errno = saved_errno;
255 return ret;
257}
258#define RUN_SETUP (1<<0)
260#define RUN_SETUP_GENTLY (1<<1)
261#define USE_PAGER (1<<2)
262/*
263 * require working tree to be present -- anything uses this needs
264 * RUN_SETUP for reading from the configuration file.
265 */
266#define NEED_WORK_TREE (1<<3)
267struct cmd_struct {
269 const char *cmd;
270 int (*fn)(int, const char **, const char *);
271 int option;
272};
273static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
275{
276 int status, help;
277 struct stat st;
278 const char *prefix;
279 prefix = NULL;
281 help = argc == 2 && !strcmp(argv[1], "-h");
282 if (!help) {
283 if (p->option & RUN_SETUP)
284 prefix = setup_git_directory();
285 if (p->option & RUN_SETUP_GENTLY) {
286 int nongit_ok;
287 prefix = setup_git_directory_gently(&nongit_ok);
288 }
289 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
291 use_pager = check_pager_config(p->cmd);
292 if (use_pager == -1 && p->option & USE_PAGER)
293 use_pager = 1;
294 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
296 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
297 trace_repo_setup(prefix);
298 }
299 commit_pager_choice();
300 if (!help && p->option & NEED_WORK_TREE)
302 setup_work_tree();
303 trace_argv_printf(argv, "trace: built-in: git");
305 status = p->fn(argc, argv, prefix);
307 if (status)
308 return status;
309 /* Somebody closed stdout? */
311 if (fstat(fileno(stdout), &st))
312 return 0;
313 /* Ignore write errors for pipes and sockets.. */
314 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
315 return 0;
316 /* Check for ENOSPC and EIO errors.. */
318 if (fflush(stdout))
319 die_errno("write failure on standard output");
320 if (ferror(stdout))
321 die("unknown write failure on standard output");
322 if (fclose(stdout))
323 die_errno("close failed on standard output");
324 return 0;
325}
326static void handle_internal_command(int argc, const char **argv)
328{
329 const char *cmd = argv[0];
330 static struct cmd_struct commands[] = {
331 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
332 { "annotate", cmd_annotate, RUN_SETUP },
333 { "apply", cmd_apply, RUN_SETUP_GENTLY },
334 { "archive", cmd_archive },
335 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
336 { "blame", cmd_blame, RUN_SETUP },
337 { "branch", cmd_branch, RUN_SETUP },
338 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
339 { "cat-file", cmd_cat_file, RUN_SETUP },
340 { "check-attr", cmd_check_attr, RUN_SETUP },
341 { "check-ref-format", cmd_check_ref_format },
342 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
343 { "checkout-index", cmd_checkout_index,
344 RUN_SETUP | NEED_WORK_TREE},
345 { "cherry", cmd_cherry, RUN_SETUP },
346 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
347 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
348 { "clone", cmd_clone },
349 { "column", cmd_column, RUN_SETUP_GENTLY },
350 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
351 { "commit-tree", cmd_commit_tree, RUN_SETUP },
352 { "config", cmd_config, RUN_SETUP_GENTLY },
353 { "count-objects", cmd_count_objects, RUN_SETUP },
354 { "describe", cmd_describe, RUN_SETUP },
355 { "diff", cmd_diff },
356 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
357 { "diff-index", cmd_diff_index, RUN_SETUP },
358 { "diff-tree", cmd_diff_tree, RUN_SETUP },
359 { "fast-export", cmd_fast_export, RUN_SETUP },
360 { "fetch", cmd_fetch, RUN_SETUP },
361 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
362 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
363 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
364 { "format-patch", cmd_format_patch, RUN_SETUP },
365 { "fsck", cmd_fsck, RUN_SETUP },
366 { "fsck-objects", cmd_fsck, RUN_SETUP },
367 { "gc", cmd_gc, RUN_SETUP },
368 { "get-tar-commit-id", cmd_get_tar_commit_id },
369 { "grep", cmd_grep, RUN_SETUP_GENTLY },
370 { "hash-object", cmd_hash_object },
371 { "help", cmd_help },
372 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
373 { "init", cmd_init_db },
374 { "init-db", cmd_init_db },
375 { "log", cmd_log, RUN_SETUP },
376 { "ls-files", cmd_ls_files, RUN_SETUP },
377 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
378 { "ls-tree", cmd_ls_tree, RUN_SETUP },
379 { "mailinfo", cmd_mailinfo },
380 { "mailsplit", cmd_mailsplit },
381 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
382 { "merge-base", cmd_merge_base, RUN_SETUP },
383 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
384 { "merge-index", cmd_merge_index, RUN_SETUP },
385 { "merge-ours", cmd_merge_ours, RUN_SETUP },
386 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
387 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
388 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
389 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
390 { "merge-tree", cmd_merge_tree, RUN_SETUP },
391 { "mktag", cmd_mktag, RUN_SETUP },
392 { "mktree", cmd_mktree, RUN_SETUP },
393 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
394 { "name-rev", cmd_name_rev, RUN_SETUP },
395 { "notes", cmd_notes, RUN_SETUP },
396 { "pack-objects", cmd_pack_objects, RUN_SETUP },
397 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
398 { "pack-refs", cmd_pack_refs, RUN_SETUP },
399 { "patch-id", cmd_patch_id },
400 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
401 { "pickaxe", cmd_blame, RUN_SETUP },
402 { "prune", cmd_prune, RUN_SETUP },
403 { "prune-packed", cmd_prune_packed, RUN_SETUP },
404 { "push", cmd_push, RUN_SETUP },
405 { "read-tree", cmd_read_tree, RUN_SETUP },
406 { "receive-pack", cmd_receive_pack },
407 { "reflog", cmd_reflog, RUN_SETUP },
408 { "remote", cmd_remote, RUN_SETUP },
409 { "remote-ext", cmd_remote_ext },
410 { "remote-fd", cmd_remote_fd },
411 { "replace", cmd_replace, RUN_SETUP },
412 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
413 { "rerere", cmd_rerere, RUN_SETUP },
414 { "reset", cmd_reset, RUN_SETUP },
415 { "rev-list", cmd_rev_list, RUN_SETUP },
416 { "rev-parse", cmd_rev_parse },
417 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
418 { "rm", cmd_rm, RUN_SETUP },
419 { "send-pack", cmd_send_pack, RUN_SETUP },
420 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
421 { "show", cmd_show, RUN_SETUP },
422 { "show-branch", cmd_show_branch, RUN_SETUP },
423 { "show-ref", cmd_show_ref, RUN_SETUP },
424 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
425 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
426 { "stripspace", cmd_stripspace },
427 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
428 { "tag", cmd_tag, RUN_SETUP },
429 { "tar-tree", cmd_tar_tree },
430 { "unpack-file", cmd_unpack_file, RUN_SETUP },
431 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
432 { "update-index", cmd_update_index, RUN_SETUP },
433 { "update-ref", cmd_update_ref, RUN_SETUP },
434 { "update-server-info", cmd_update_server_info, RUN_SETUP },
435 { "upload-archive", cmd_upload_archive },
436 { "upload-archive--writer", cmd_upload_archive_writer },
437 { "var", cmd_var, RUN_SETUP_GENTLY },
438 { "verify-pack", cmd_verify_pack },
439 { "verify-tag", cmd_verify_tag, RUN_SETUP },
440 { "version", cmd_version },
441 { "whatchanged", cmd_whatchanged, RUN_SETUP },
442 { "write-tree", cmd_write_tree, RUN_SETUP },
443 };
444 int i;
445 static const char ext[] = STRIP_EXTENSION;
446 if (sizeof(ext) > 1) {
448 i = strlen(argv[0]) - strlen(ext);
449 if (i > 0 && !strcmp(argv[0] + i, ext)) {
450 char *argv0 = xstrdup(argv[0]);
451 argv[0] = cmd = argv0;
452 argv0[i] = '\0';
453 }
454 }
455 /* Turn "git cmd --help" into "git help cmd" */
457 if (argc > 1 && !strcmp(argv[1], "--help")) {
458 argv[1] = argv[0];
459 argv[0] = cmd = "help";
460 }
461 for (i = 0; i < ARRAY_SIZE(commands); i++) {
463 struct cmd_struct *p = commands+i;
464 if (strcmp(p->cmd, cmd))
465 continue;
466 exit(run_builtin(p, argc, argv));
467 }
468}
469static void execv_dashed_external(const char **argv)
471{
472 struct strbuf cmd = STRBUF_INIT;
473 const char *tmp;
474 int status;
475 if (use_pager == -1)
477 use_pager = check_pager_config(argv[0]);
478 commit_pager_choice();
479 strbuf_addf(&cmd, "git-%s", argv[0]);
481 /*
483 * argv[0] must be the git command, but the argv array
484 * belongs to the caller, and may be reused in
485 * subsequent loop iterations. Save argv[0] and
486 * restore it on error.
487 */
488 tmp = argv[0];
489 argv[0] = cmd.buf;
490 trace_argv_printf(argv, "trace: exec:");
492 /*
494 * if we fail because the command is not found, it is
495 * OK to return. Otherwise, we just pass along the status code.
496 */
497 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
498 if (status >= 0 || errno != ENOENT)
499 exit(status);
500 argv[0] = tmp;
502 strbuf_release(&cmd);
504}
505static int run_argv(int *argcp, const char ***argv)
507{
508 int done_alias = 0;
509 while (1) {
511 /* See if it's an internal command */
512 handle_internal_command(*argcp, *argv);
513 /* .. then try the external ones */
515 execv_dashed_external(*argv);
516 /* It could be an alias -- this works around the insanity
518 * of overriding "git log" with "git show" by having
519 * alias.log = show
520 */
521 if (done_alias || !handle_alias(argcp, argv))
522 break;
523 done_alias = 1;
524 }
525 return done_alias;
527}
528int main(int argc, const char **argv)
531{
532 const char *cmd;
533 startup_info = &git_startup_info;
535 cmd = git_extract_argv0_path(argv[0]);
537 if (!cmd)
538 cmd = "git-help";
539 git_setup_gettext();
541 /*
543 * "git-xxxx" is the same as "git xxxx", but we obviously:
544 *
545 * - cannot take flags in between the "git" and the "xxxx".
546 * - cannot execute it externally (since it would just do
547 * the same thing over again)
548 *
549 * So we just directly call the internal command handler, and
550 * die if that one cannot handle it.
551 */
552 if (!prefixcmp(cmd, "git-")) {
553 cmd += 4;
554 argv[0] = cmd;
555 handle_internal_command(argc, argv);
556 die("cannot handle %s internally", cmd);
557 }
558 /* Look for flags.. */
560 argv++;
561 argc--;
562 handle_options(&argv, &argc, NULL);
563 if (argc > 0) {
564 if (!prefixcmp(argv[0], "--"))
565 argv[0] += 2;
566 } else {
567 /* The user didn't specify a command; give them help */
568 commit_pager_choice();
569 printf("usage: %s\n\n", git_usage_string);
570 list_common_cmds_help();
571 printf("\n%s\n", git_more_info_string);
572 exit(1);
573 }
574 cmd = argv[0];
575 /*
577 * We use PATH to find git commands, but we prepend some higher
578 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
579 * environment, and the $(gitexecdir) from the Makefile at build
580 * time.
581 */
582 setup_path();
583 while (1) {
585 static int done_help = 0;
586 static int was_alias = 0;
587 was_alias = run_argv(&argc, &argv);
588 if (errno != ENOENT)
589 break;
590 if (was_alias) {
591 fprintf(stderr, "Expansion of alias '%s' failed; "
592 "'%s' is not a git command\n",
593 cmd, argv[0]);
594 exit(1);
595 }
596 if (!done_help) {
597 cmd = argv[0] = help_unknown_cmd(cmd);
598 done_help = 1;
599 } else
600 break;
601 }
602 fprintf(stderr, "Failed to run command '%s': %s\n",
604 cmd, strerror(errno));
605 return 1;
607}