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]\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 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, "-p") || !strcmp(cmd, "--paginate")) {
99 use_pager = 1;
100 } else if (!strcmp(cmd, "--no-pager")) {
101 use_pager = 0;
102 if (envchanged)
103 *envchanged = 1;
104 } else if (!strcmp(cmd, "--no-replace-objects")) {
105 read_replace_refs = 0;
106 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
107 if (envchanged)
108 *envchanged = 1;
109 } else if (!strcmp(cmd, "--git-dir")) {
110 if (*argc < 2) {
111 fprintf(stderr, "No directory given for --git-dir.\n" );
112 usage(git_usage_string);
113 }
114 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
115 if (envchanged)
116 *envchanged = 1;
117 (*argv)++;
118 (*argc)--;
119 handled++;
120 } else if (!prefixcmp(cmd, "--git-dir=")) {
121 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
122 if (envchanged)
123 *envchanged = 1;
124 } else if (!strcmp(cmd, "--work-tree")) {
125 if (*argc < 2) {
126 fprintf(stderr, "No directory given for --work-tree.\n" );
127 usage(git_usage_string);
128 }
129 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
130 if (envchanged)
131 *envchanged = 1;
132 (*argv)++;
133 (*argc)--;
134 } else if (!prefixcmp(cmd, "--work-tree=")) {
135 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
136 if (envchanged)
137 *envchanged = 1;
138 } else if (!strcmp(cmd, "--bare")) {
139 static char git_dir[PATH_MAX+1];
140 is_bare_repository_cfg = 1;
141 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
142 if (envchanged)
143 *envchanged = 1;
144 } else if (!strcmp(cmd, "-c")) {
145 if (*argc < 2) {
146 fprintf(stderr, "-c expects a configuration string\n" );
147 usage(git_usage_string);
148 }
149 git_config_push_parameter((*argv)[1]);
150 (*argv)++;
151 (*argc)--;
152 } else {
153 fprintf(stderr, "Unknown option: %s\n", cmd);
154 usage(git_usage_string);
155 }
156 (*argv)++;
158 (*argc)--;
159 handled++;
160 }
161 return handled;
162}
163static int handle_alias(int *argcp, const char ***argv)
165{
166 int envchanged = 0, ret = 0, saved_errno = errno;
167 const char *subdir;
168 int count, option_count;
169 const char **new_argv;
170 const char *alias_command;
171 char *alias_string;
172 int unused_nongit;
173 subdir = setup_git_directory_gently(&unused_nongit);
175 alias_command = (*argv)[0];
177 alias_string = alias_lookup(alias_command);
178 if (alias_string) {
179 if (alias_string[0] == '!') {
180 commit_pager_choice();
181 if (*argcp > 1) {
182 struct strbuf buf;
183 strbuf_init(&buf, PATH_MAX);
185 strbuf_addstr(&buf, alias_string);
186 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
187 free(alias_string);
188 alias_string = buf.buf;
189 }
190 trace_printf("trace: alias to shell cmd: %s => %s\n",
191 alias_command, alias_string + 1);
192 ret = system(alias_string + 1);
193 if (ret >= 0 && WIFEXITED(ret) &&
194 WEXITSTATUS(ret) != 127)
195 exit(WEXITSTATUS(ret));
196 die("Failed to run '%s' when expanding alias '%s'",
197 alias_string + 1, alias_command);
198 }
199 count = split_cmdline(alias_string, &new_argv);
200 if (count < 0)
201 die("Bad alias.%s string: %s", alias_command,
202 split_cmdline_strerror(count));
203 option_count = handle_options(&new_argv, &count, &envchanged);
204 if (envchanged)
205 die("alias '%s' changes environment variables\n"
206 "You can use '!git' in the alias to do this.",
207 alias_command);
208 memmove(new_argv - option_count, new_argv,
209 count * sizeof(char *));
210 new_argv -= option_count;
211 if (count < 1)
213 die("empty alias for %s", alias_command);
214 if (!strcmp(alias_command, new_argv[0]))
216 die("recursive alias: %s", alias_command);
217 trace_argv_printf(new_argv,
219 "trace: alias expansion: %s =>",
220 alias_command);
221 new_argv = xrealloc(new_argv, sizeof(char *) *
223 (count + *argcp));
224 /* insert after command name */
225 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
226 *argv = new_argv;
228 *argcp += count - 1;
229 ret = 1;
231 }
232 if (subdir && chdir(subdir))
234 die_errno("Cannot change to '%s'", subdir);
235 errno = saved_errno;
237 return ret;
239}
240const char git_version_string[] = GIT_VERSION;
242#define RUN_SETUP (1<<0)
244#define RUN_SETUP_GENTLY (1<<1)
245#define USE_PAGER (1<<2)
246/*
247 * require working tree to be present -- anything uses this needs
248 * RUN_SETUP for reading from the configuration file.
249 */
250#define NEED_WORK_TREE (1<<3)
251struct cmd_struct {
253 const char *cmd;
254 int (*fn)(int, const char **, const char *);
255 int option;
256};
257static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
259{
260 int status, help;
261 struct stat st;
262 const char *prefix;
263 prefix = NULL;
265 help = argc == 2 && !strcmp(argv[1], "-h");
266 if (!help) {
267 if (p->option & RUN_SETUP)
268 prefix = setup_git_directory();
269 if (p->option & RUN_SETUP_GENTLY) {
270 int nongit_ok;
271 prefix = setup_git_directory_gently(&nongit_ok);
272 }
273 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
275 use_pager = check_pager_config(p->cmd);
276 if (use_pager == -1 && p->option & USE_PAGER)
277 use_pager = 1;
278 }
279 commit_pager_choice();
280 if (!help && p->option & NEED_WORK_TREE)
282 setup_work_tree();
283 trace_argv_printf(argv, "trace: built-in: git");
285 status = p->fn(argc, argv, prefix);
287 if (status)
288 return status;
289 /* Somebody closed stdout? */
291 if (fstat(fileno(stdout), &st))
292 return 0;
293 /* Ignore write errors for pipes and sockets.. */
294 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
295 return 0;
296 /* Check for ENOSPC and EIO errors.. */
298 if (fflush(stdout))
299 die_errno("write failure on standard output");
300 if (ferror(stdout))
301 die("unknown write failure on standard output");
302 if (fclose(stdout))
303 die_errno("close failed on standard output");
304 return 0;
305}
306static void handle_internal_command(int argc, const char **argv)
308{
309 const char *cmd = argv[0];
310 static struct cmd_struct commands[] = {
311 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
312 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
313 { "annotate", cmd_annotate, RUN_SETUP },
314 { "apply", cmd_apply, RUN_SETUP_GENTLY },
315 { "archive", cmd_archive },
316 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
317 { "blame", cmd_blame, RUN_SETUP },
318 { "branch", cmd_branch, RUN_SETUP },
319 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
320 { "cat-file", cmd_cat_file, RUN_SETUP },
321 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
322 { "checkout-index", cmd_checkout_index,
323 RUN_SETUP | NEED_WORK_TREE},
324 { "check-ref-format", cmd_check_ref_format },
325 { "check-attr", cmd_check_attr, RUN_SETUP },
326 { "cherry", cmd_cherry, RUN_SETUP },
327 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
328 { "clone", cmd_clone },
329 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
330 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
331 { "commit-tree", cmd_commit_tree, RUN_SETUP },
332 { "config", cmd_config, RUN_SETUP_GENTLY },
333 { "count-objects", cmd_count_objects, RUN_SETUP },
334 { "describe", cmd_describe, RUN_SETUP },
335 { "diff", cmd_diff },
336 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
337 { "diff-index", cmd_diff_index, RUN_SETUP },
338 { "diff-tree", cmd_diff_tree, RUN_SETUP },
339 { "fast-export", cmd_fast_export, RUN_SETUP },
340 { "fetch", cmd_fetch, RUN_SETUP },
341 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
342 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
343 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
344 { "format-patch", cmd_format_patch, RUN_SETUP },
345 { "fsck", cmd_fsck, RUN_SETUP },
346 { "fsck-objects", cmd_fsck, RUN_SETUP },
347 { "gc", cmd_gc, RUN_SETUP },
348 { "get-tar-commit-id", cmd_get_tar_commit_id },
349 { "grep", cmd_grep, RUN_SETUP_GENTLY },
350 { "hash-object", cmd_hash_object },
351 { "help", cmd_help },
352 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
353 { "init", cmd_init_db },
354 { "init-db", cmd_init_db },
355 { "log", cmd_log, RUN_SETUP },
356 { "ls-files", cmd_ls_files, RUN_SETUP },
357 { "ls-tree", cmd_ls_tree, RUN_SETUP },
358 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
359 { "mailinfo", cmd_mailinfo },
360 { "mailsplit", cmd_mailsplit },
361 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
362 { "merge-base", cmd_merge_base, RUN_SETUP },
363 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
364 { "merge-index", cmd_merge_index, RUN_SETUP },
365 { "merge-ours", cmd_merge_ours, RUN_SETUP },
366 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
367 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
368 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
369 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
370 { "merge-tree", cmd_merge_tree, RUN_SETUP },
371 { "mktag", cmd_mktag, RUN_SETUP },
372 { "mktree", cmd_mktree, RUN_SETUP },
373 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
374 { "name-rev", cmd_name_rev, RUN_SETUP },
375 { "notes", cmd_notes, RUN_SETUP },
376 { "pack-objects", cmd_pack_objects, RUN_SETUP },
377 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
378 { "patch-id", cmd_patch_id },
379 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
380 { "pickaxe", cmd_blame, RUN_SETUP },
381 { "prune", cmd_prune, RUN_SETUP },
382 { "prune-packed", cmd_prune_packed, RUN_SETUP },
383 { "push", cmd_push, RUN_SETUP },
384 { "read-tree", cmd_read_tree, RUN_SETUP },
385 { "receive-pack", cmd_receive_pack },
386 { "reflog", cmd_reflog, RUN_SETUP },
387 { "remote", cmd_remote, RUN_SETUP },
388 { "remote-ext", cmd_remote_ext },
389 { "remote-fd", cmd_remote_fd },
390 { "replace", cmd_replace, RUN_SETUP },
391 { "repo-config", cmd_config, RUN_SETUP_GENTLY },
392 { "rerere", cmd_rerere, RUN_SETUP },
393 { "reset", cmd_reset, RUN_SETUP },
394 { "rev-list", cmd_rev_list, RUN_SETUP },
395 { "rev-parse", cmd_rev_parse },
396 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
397 { "rm", cmd_rm, RUN_SETUP },
398 { "send-pack", cmd_send_pack, RUN_SETUP },
399 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
400 { "show-branch", cmd_show_branch, RUN_SETUP },
401 { "show", cmd_show, RUN_SETUP },
402 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
403 { "stripspace", cmd_stripspace },
404 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
405 { "tag", cmd_tag, RUN_SETUP },
406 { "tar-tree", cmd_tar_tree },
407 { "unpack-file", cmd_unpack_file, RUN_SETUP },
408 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
409 { "update-index", cmd_update_index, RUN_SETUP },
410 { "update-ref", cmd_update_ref, RUN_SETUP },
411 { "update-server-info", cmd_update_server_info, RUN_SETUP },
412 { "upload-archive", cmd_upload_archive },
413 { "var", cmd_var, RUN_SETUP_GENTLY },
414 { "verify-tag", cmd_verify_tag, RUN_SETUP },
415 { "version", cmd_version },
416 { "whatchanged", cmd_whatchanged, RUN_SETUP },
417 { "write-tree", cmd_write_tree, RUN_SETUP },
418 { "verify-pack", cmd_verify_pack },
419 { "show-ref", cmd_show_ref, RUN_SETUP },
420 { "pack-refs", cmd_pack_refs, RUN_SETUP },
421 };
422 int i;
423 static const char ext[] = STRIP_EXTENSION;
424 if (sizeof(ext) > 1) {
426 i = strlen(argv[0]) - strlen(ext);
427 if (i > 0 && !strcmp(argv[0] + i, ext)) {
428 char *argv0 = xstrdup(argv[0]);
429 argv[0] = cmd = argv0;
430 argv0[i] = '\0';
431 }
432 }
433 /* Turn "git cmd --help" into "git help cmd" */
435 if (argc > 1 && !strcmp(argv[1], "--help")) {
436 argv[1] = argv[0];
437 argv[0] = cmd = "help";
438 }
439 for (i = 0; i < ARRAY_SIZE(commands); i++) {
441 struct cmd_struct *p = commands+i;
442 if (strcmp(p->cmd, cmd))
443 continue;
444 exit(run_builtin(p, argc, argv));
445 }
446}
447static void execv_dashed_external(const char **argv)
449{
450 struct strbuf cmd = STRBUF_INIT;
451 const char *tmp;
452 int status;
453 commit_pager_choice();
455 strbuf_addf(&cmd, "git-%s", argv[0]);
457 /*
459 * argv[0] must be the git command, but the argv array
460 * belongs to the caller, and may be reused in
461 * subsequent loop iterations. Save argv[0] and
462 * restore it on error.
463 */
464 tmp = argv[0];
465 argv[0] = cmd.buf;
466 trace_argv_printf(argv, "trace: exec:");
468 /*
470 * if we fail because the command is not found, it is
471 * OK to return. Otherwise, we just pass along the status code.
472 */
473 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
474 if (status >= 0 || errno != ENOENT)
475 exit(status);
476 argv[0] = tmp;
478 strbuf_release(&cmd);
480}
481static int run_argv(int *argcp, const char ***argv)
483{
484 int done_alias = 0;
485 while (1) {
487 /* See if it's an internal command */
488 handle_internal_command(*argcp, *argv);
489 /* .. then try the external ones */
491 execv_dashed_external(*argv);
492 /* It could be an alias -- this works around the insanity
494 * of overriding "git log" with "git show" by having
495 * alias.log = show
496 */
497 if (done_alias || !handle_alias(argcp, argv))
498 break;
499 done_alias = 1;
500 }
501 return done_alias;
503}
504int main(int argc, const char **argv)
507{
508 const char *cmd;
509 startup_info = &git_startup_info;
511 cmd = git_extract_argv0_path(argv[0]);
513 if (!cmd)
514 cmd = "git-help";
515 /*
517 * "git-xxxx" is the same as "git xxxx", but we obviously:
518 *
519 * - cannot take flags in between the "git" and the "xxxx".
520 * - cannot execute it externally (since it would just do
521 * the same thing over again)
522 *
523 * So we just directly call the internal command handler, and
524 * die if that one cannot handle it.
525 */
526 if (!prefixcmp(cmd, "git-")) {
527 cmd += 4;
528 argv[0] = cmd;
529 handle_internal_command(argc, argv);
530 die("cannot handle %s internally", cmd);
531 }
532 /* Look for flags.. */
534 argv++;
535 argc--;
536 handle_options(&argv, &argc, NULL);
537 if (argc > 0) {
538 if (!prefixcmp(argv[0], "--"))
539 argv[0] += 2;
540 } else {
541 /* The user didn't specify a command; give them help */
542 commit_pager_choice();
543 printf("usage: %s\n\n", git_usage_string);
544 list_common_cmds_help();
545 printf("\n%s\n", git_more_info_string);
546 exit(1);
547 }
548 cmd = argv[0];
549 /*
551 * We use PATH to find git commands, but we prepend some higher
552 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
553 * environment, and the $(gitexecdir) from the Makefile at build
554 * time.
555 */
556 setup_path();
557 while (1) {
559 static int done_help = 0;
560 static int was_alias = 0;
561 was_alias = run_argv(&argc, &argv);
562 if (errno != ENOENT)
563 break;
564 if (was_alias) {
565 fprintf(stderr, "Expansion of alias '%s' failed; "
566 "'%s' is not a git command\n",
567 cmd, argv[0]);
568 exit(1);
569 }
570 if (!done_help) {
571 cmd = argv[0] = help_unknown_cmd(cmd);
572 done_help = 1;
573 } else
574 break;
575 }
576 fprintf(stderr, "Failed to run command '%s': %s\n",
578 cmd, strerror(errno));
579 return 1;
581}