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]\n"
11 " [--bare] [--git-dir=<path>] [--work-tree=<path>]\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 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, "--work-tree")) {
130 if (*argc < 2) {
131 fprintf(stderr, "No directory given for --work-tree.\n" );
132 usage(git_usage_string);
133 }
134 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
135 if (envchanged)
136 *envchanged = 1;
137 (*argv)++;
138 (*argc)--;
139 } else if (!prefixcmp(cmd, "--work-tree=")) {
140 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
141 if (envchanged)
142 *envchanged = 1;
143 } else if (!strcmp(cmd, "--bare")) {
144 static char git_dir[PATH_MAX+1];
145 is_bare_repository_cfg = 1;
146 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
147 if (envchanged)
148 *envchanged = 1;
149 } else if (!strcmp(cmd, "-c")) {
150 if (*argc < 2) {
151 fprintf(stderr, "-c expects a configuration string\n" );
152 usage(git_usage_string);
153 }
154 git_config_push_parameter((*argv)[1]);
155 (*argv)++;
156 (*argc)--;
157 } else {
158 fprintf(stderr, "Unknown option: %s\n", cmd);
159 usage(git_usage_string);
160 }
161 (*argv)++;
163 (*argc)--;
164 }
165 return (*argv) - orig_argv;
166}
167static int handle_alias(int *argcp, const char ***argv)
169{
170 int envchanged = 0, ret = 0, saved_errno = errno;
171 const char *subdir;
172 int count, option_count;
173 const char **new_argv;
174 const char *alias_command;
175 char *alias_string;
176 int unused_nongit;
177 subdir = setup_git_directory_gently(&unused_nongit);
179 alias_command = (*argv)[0];
181 alias_string = alias_lookup(alias_command);
182 if (alias_string) {
183 if (alias_string[0] == '!') {
184 const char **alias_argv;
185 int argc = *argcp, i;
186 commit_pager_choice();
188 /* build alias_argv */
190 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
191 alias_argv[0] = alias_string + 1;
192 for (i = 1; i < argc; ++i)
193 alias_argv[i] = (*argv)[i];
194 alias_argv[argc] = NULL;
195 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
197 if (ret >= 0) /* normal exit */
198 exit(ret);
199 die_errno("While expanding alias '%s': '%s'",
201 alias_command, alias_string + 1);
202 }
203 count = split_cmdline(alias_string, &new_argv);
204 if (count < 0)
205 die("Bad alias.%s string: %s", alias_command,
206 split_cmdline_strerror(count));
207 option_count = handle_options(&new_argv, &count, &envchanged);
208 if (envchanged)
209 die("alias '%s' changes environment variables\n"
210 "You can use '!git' in the alias to do this.",
211 alias_command);
212 memmove(new_argv - option_count, new_argv,
213 count * sizeof(char *));
214 new_argv -= option_count;
215 if (count < 1)
217 die("empty alias for %s", alias_command);
218 if (!strcmp(alias_command, new_argv[0]))
220 die("recursive alias: %s", alias_command);
221 trace_argv_printf(new_argv,
223 "trace: alias expansion: %s =>",
224 alias_command);
225 new_argv = xrealloc(new_argv, sizeof(char *) *
227 (count + *argcp));
228 /* insert after command name */
229 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
230 *argv = new_argv;
232 *argcp += count - 1;
233 ret = 1;
235 }
236 if (subdir && chdir(subdir))
238 die_errno("Cannot change to '%s'", subdir);
239 errno = saved_errno;
241 return ret;
243}
244const char git_version_string[] = GIT_VERSION;
246#define RUN_SETUP (1<<0)
248#define RUN_SETUP_GENTLY (1<<1)
249#define USE_PAGER (1<<2)
250/*
251 * require working tree to be present -- anything uses this needs
252 * RUN_SETUP for reading from the configuration file.
253 */
254#define NEED_WORK_TREE (1<<3)
255struct cmd_struct {
257 const char *cmd;
258 int (*fn)(int, const char **, const char *);
259 int option;
260};
261static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
263{
264 int status, help;
265 struct stat st;
266 const char *prefix;
267 prefix = NULL;
269 help = argc == 2 && !strcmp(argv[1], "-h");
270 if (!help) {
271 if (p->option & RUN_SETUP)
272 prefix = setup_git_directory();
273 if (p->option & RUN_SETUP_GENTLY) {
274 int nongit_ok;
275 prefix = setup_git_directory_gently(&nongit_ok);
276 }
277 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
279 use_pager = check_pager_config(p->cmd);
280 if (use_pager == -1 && p->option & USE_PAGER)
281 use_pager = 1;
282 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
284 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
285 trace_repo_setup(prefix);
286 }
287 commit_pager_choice();
288 if (!help && p->option & NEED_WORK_TREE)
290 setup_work_tree();
291 trace_argv_printf(argv, "trace: built-in: git");
293 status = p->fn(argc, argv, prefix);
295 if (status)
296 return status;
297 /* Somebody closed stdout? */
299 if (fstat(fileno(stdout), &st))
300 return 0;
301 /* Ignore write errors for pipes and sockets.. */
302 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
303 return 0;
304 /* Check for ENOSPC and EIO errors.. */
306 if (fflush(stdout))
307 die_errno("write failure on standard output");
308 if (ferror(stdout))
309 die("unknown write failure on standard output");
310 if (fclose(stdout))
311 die_errno("close failed on standard output");
312 return 0;
313}
314static void handle_internal_command(int argc, const char **argv)
316{
317 const char *cmd = argv[0];
318 static struct cmd_struct commands[] = {
319 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
320 { "annotate", cmd_annotate, RUN_SETUP },
321 { "apply", cmd_apply, RUN_SETUP_GENTLY },
322 { "archive", cmd_archive },
323 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
324 { "blame", cmd_blame, RUN_SETUP },
325 { "branch", cmd_branch, RUN_SETUP },
326 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
327 { "cat-file", cmd_cat_file, RUN_SETUP },
328 { "check-attr", cmd_check_attr, RUN_SETUP },
329 { "check-ref-format", cmd_check_ref_format },
330 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
331 { "checkout-index", cmd_checkout_index,
332 RUN_SETUP | NEED_WORK_TREE},
333 { "cherry", cmd_cherry, RUN_SETUP },
334 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
335 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
336 { "clone", cmd_clone },
337 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
338 { "commit-tree", cmd_commit_tree, RUN_SETUP },
339 { "config", cmd_config, RUN_SETUP_GENTLY },
340 { "count-objects", cmd_count_objects, RUN_SETUP },
341 { "describe", cmd_describe, RUN_SETUP },
342 { "diff", cmd_diff },
343 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
344 { "diff-index", cmd_diff_index, RUN_SETUP },
345 { "diff-tree", cmd_diff_tree, RUN_SETUP },
346 { "fast-export", cmd_fast_export, RUN_SETUP },
347 { "fetch", cmd_fetch, RUN_SETUP },
348 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
349 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
350 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
351 { "format-patch", cmd_format_patch, RUN_SETUP },
352 { "fsck", cmd_fsck, RUN_SETUP },
353 { "fsck-objects", cmd_fsck, RUN_SETUP },
354 { "gc", cmd_gc, RUN_SETUP },
355 { "get-tar-commit-id", cmd_get_tar_commit_id },
356 { "grep", cmd_grep, RUN_SETUP_GENTLY },
357 { "hash-object", cmd_hash_object },
358 { "help", cmd_help },
359 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
360 { "init", cmd_init_db },
361 { "init-db", cmd_init_db },
362 { "log", cmd_log, RUN_SETUP },
363 { "ls-files", cmd_ls_files, RUN_SETUP },
364 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
365 { "ls-tree", cmd_ls_tree, RUN_SETUP },
366 { "mailinfo", cmd_mailinfo },
367 { "mailsplit", cmd_mailsplit },
368 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
369 { "merge-base", cmd_merge_base, RUN_SETUP },
370 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
371 { "merge-index", cmd_merge_index, RUN_SETUP },
372 { "merge-ours", cmd_merge_ours, RUN_SETUP },
373 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
374 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
375 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
376 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
377 { "merge-tree", cmd_merge_tree, RUN_SETUP },
378 { "mktag", cmd_mktag, RUN_SETUP },
379 { "mktree", cmd_mktree, RUN_SETUP },
380 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
381 { "name-rev", cmd_name_rev, RUN_SETUP },
382 { "notes", cmd_notes, RUN_SETUP },
383 { "pack-objects", cmd_pack_objects, RUN_SETUP },
384 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
385 { "pack-refs", cmd_pack_refs, RUN_SETUP },
386 { "patch-id", cmd_patch_id },
387 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
388 { "pickaxe", cmd_blame, RUN_SETUP },
389 { "prune", cmd_prune, RUN_SETUP },
390 { "prune-packed", cmd_prune_packed, RUN_SETUP },
391 { "push", cmd_push, RUN_SETUP },
392 { "read-tree", cmd_read_tree, RUN_SETUP },
393 { "receive-pack", cmd_receive_pack },
394 { "reflog", cmd_reflog, RUN_SETUP },
395 { "remote", cmd_remote, RUN_SETUP },
396 { "remote-ext", cmd_remote_ext },
397 { "remote-fd", cmd_remote_fd },
398 { "replace", cmd_replace, RUN_SETUP },
399 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
400 { "rerere", cmd_rerere, RUN_SETUP },
401 { "reset", cmd_reset, RUN_SETUP },
402 { "rev-list", cmd_rev_list, RUN_SETUP },
403 { "rev-parse", cmd_rev_parse },
404 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
405 { "rm", cmd_rm, RUN_SETUP },
406 { "send-pack", cmd_send_pack, RUN_SETUP },
407 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
408 { "show", cmd_show, RUN_SETUP },
409 { "show-branch", cmd_show_branch, RUN_SETUP },
410 { "show-ref", cmd_show_ref, RUN_SETUP },
411 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
412 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
413 { "stripspace", cmd_stripspace },
414 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
415 { "tag", cmd_tag, RUN_SETUP },
416 { "tar-tree", cmd_tar_tree },
417 { "unpack-file", cmd_unpack_file, RUN_SETUP },
418 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
419 { "update-index", cmd_update_index, RUN_SETUP },
420 { "update-ref", cmd_update_ref, RUN_SETUP },
421 { "update-server-info", cmd_update_server_info, RUN_SETUP },
422 { "upload-archive", cmd_upload_archive },
423 { "var", cmd_var, RUN_SETUP_GENTLY },
424 { "verify-pack", cmd_verify_pack },
425 { "verify-tag", cmd_verify_tag, RUN_SETUP },
426 { "version", cmd_version },
427 { "whatchanged", cmd_whatchanged, RUN_SETUP },
428 { "write-tree", cmd_write_tree, RUN_SETUP },
429 };
430 int i;
431 static const char ext[] = STRIP_EXTENSION;
432 if (sizeof(ext) > 1) {
434 i = strlen(argv[0]) - strlen(ext);
435 if (i > 0 && !strcmp(argv[0] + i, ext)) {
436 char *argv0 = xstrdup(argv[0]);
437 argv[0] = cmd = argv0;
438 argv0[i] = '\0';
439 }
440 }
441 /* Turn "git cmd --help" into "git help cmd" */
443 if (argc > 1 && !strcmp(argv[1], "--help")) {
444 argv[1] = argv[0];
445 argv[0] = cmd = "help";
446 }
447 for (i = 0; i < ARRAY_SIZE(commands); i++) {
449 struct cmd_struct *p = commands+i;
450 if (strcmp(p->cmd, cmd))
451 continue;
452 exit(run_builtin(p, argc, argv));
453 }
454}
455static void execv_dashed_external(const char **argv)
457{
458 struct strbuf cmd = STRBUF_INIT;
459 const char *tmp;
460 int status;
461 commit_pager_choice();
463 strbuf_addf(&cmd, "git-%s", argv[0]);
465 /*
467 * argv[0] must be the git command, but the argv array
468 * belongs to the caller, and may be reused in
469 * subsequent loop iterations. Save argv[0] and
470 * restore it on error.
471 */
472 tmp = argv[0];
473 argv[0] = cmd.buf;
474 trace_argv_printf(argv, "trace: exec:");
476 /*
478 * if we fail because the command is not found, it is
479 * OK to return. Otherwise, we just pass along the status code.
480 */
481 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
482 if (status >= 0 || errno != ENOENT)
483 exit(status);
484 argv[0] = tmp;
486 strbuf_release(&cmd);
488}
489static int run_argv(int *argcp, const char ***argv)
491{
492 int done_alias = 0;
493 while (1) {
495 /* See if it's an internal command */
496 handle_internal_command(*argcp, *argv);
497 /* .. then try the external ones */
499 execv_dashed_external(*argv);
500 /* It could be an alias -- this works around the insanity
502 * of overriding "git log" with "git show" by having
503 * alias.log = show
504 */
505 if (done_alias || !handle_alias(argcp, argv))
506 break;
507 done_alias = 1;
508 }
509 return done_alias;
511}
512int main(int argc, const char **argv)
515{
516 const char *cmd;
517 startup_info = &git_startup_info;
519 cmd = git_extract_argv0_path(argv[0]);
521 if (!cmd)
522 cmd = "git-help";
523 /*
525 * "git-xxxx" is the same as "git xxxx", but we obviously:
526 *
527 * - cannot take flags in between the "git" and the "xxxx".
528 * - cannot execute it externally (since it would just do
529 * the same thing over again)
530 *
531 * So we just directly call the internal command handler, and
532 * die if that one cannot handle it.
533 */
534 if (!prefixcmp(cmd, "git-")) {
535 cmd += 4;
536 argv[0] = cmd;
537 handle_internal_command(argc, argv);
538 die("cannot handle %s internally", cmd);
539 }
540 /* Look for flags.. */
542 argv++;
543 argc--;
544 handle_options(&argv, &argc, NULL);
545 if (argc > 0) {
546 if (!prefixcmp(argv[0], "--"))
547 argv[0] += 2;
548 } else {
549 /* The user didn't specify a command; give them help */
550 commit_pager_choice();
551 printf("usage: %s\n\n", git_usage_string);
552 list_common_cmds_help();
553 printf("\n%s\n", git_more_info_string);
554 exit(1);
555 }
556 cmd = argv[0];
557 /*
559 * We use PATH to find git commands, but we prepend some higher
560 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
561 * environment, and the $(gitexecdir) from the Makefile at build
562 * time.
563 */
564 setup_path();
565 while (1) {
567 static int done_help = 0;
568 static int was_alias = 0;
569 was_alias = run_argv(&argc, &argv);
570 if (errno != ENOENT)
571 break;
572 if (was_alias) {
573 fprintf(stderr, "Expansion of alias '%s' failed; "
574 "'%s' is not a git command\n",
575 cmd, argv[0]);
576 exit(1);
577 }
578 if (!done_help) {
579 cmd = argv[0] = help_unknown_cmd(cmd);
580 done_help = 1;
581 } else
582 break;
583 }
584 fprintf(stderr, "Failed to run command '%s': %s\n",
586 cmd, strerror(errno));
587 return 1;
589}