make "mktag" a built-in
[git/git.git] / git.c
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5 #include "run-command.h"
6
7 const char git_usage_string[] =
8 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
9 " [-p|--paginate|--no-pager] [--no-replace-objects]\n"
10 " [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
11 " [--help] COMMAND [ARGS]";
12
13 const char git_more_info_string[] =
14 "See 'git help COMMAND' for more information on a specific command.";
15
16 static int use_pager = -1;
17 struct pager_config {
18 const char *cmd;
19 int val;
20 };
21
22 static int pager_command_config(const char *var, const char *value, void *data)
23 {
24 struct pager_config *c = data;
25 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
26 c->val = git_config_bool(var, value);
27 return 0;
28 }
29
30 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
31 int check_pager_config(const char *cmd)
32 {
33 struct pager_config c;
34 c.cmd = cmd;
35 c.val = -1;
36 git_config(pager_command_config, &c);
37 return c.val;
38 }
39
40 static void commit_pager_choice(void) {
41 switch (use_pager) {
42 case 0:
43 setenv("GIT_PAGER", "cat", 1);
44 break;
45 case 1:
46 setup_pager();
47 break;
48 default:
49 break;
50 }
51 }
52
53 static int handle_options(const char ***argv, int *argc, int *envchanged)
54 {
55 int handled = 0;
56
57 while (*argc > 0) {
58 const char *cmd = (*argv)[0];
59 if (cmd[0] != '-')
60 break;
61
62 /*
63 * For legacy reasons, the "version" and "help"
64 * commands can be written with "--" prepended
65 * to make them look like flags.
66 */
67 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
68 break;
69
70 /*
71 * Check remaining flags.
72 */
73 if (!prefixcmp(cmd, "--exec-path")) {
74 cmd += 11;
75 if (*cmd == '=')
76 git_set_argv_exec_path(cmd + 1);
77 else {
78 puts(git_exec_path());
79 exit(0);
80 }
81 } else if (!strcmp(cmd, "--html-path")) {
82 puts(system_path(GIT_HTML_PATH));
83 exit(0);
84 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
85 use_pager = 1;
86 } else if (!strcmp(cmd, "--no-pager")) {
87 use_pager = 0;
88 if (envchanged)
89 *envchanged = 1;
90 } else if (!strcmp(cmd, "--no-replace-objects")) {
91 read_replace_refs = 0;
92 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
93 if (envchanged)
94 *envchanged = 1;
95 } else if (!strcmp(cmd, "--git-dir")) {
96 if (*argc < 2) {
97 fprintf(stderr, "No directory given for --git-dir.\n" );
98 usage(git_usage_string);
99 }
100 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
101 if (envchanged)
102 *envchanged = 1;
103 (*argv)++;
104 (*argc)--;
105 handled++;
106 } else if (!prefixcmp(cmd, "--git-dir=")) {
107 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 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 if (envchanged)
129 *envchanged = 1;
130 } else {
131 fprintf(stderr, "Unknown option: %s\n", cmd);
132 usage(git_usage_string);
133 }
134
135 (*argv)++;
136 (*argc)--;
137 handled++;
138 }
139 return handled;
140 }
141
142 static int handle_alias(int *argcp, const char ***argv)
143 {
144 int envchanged = 0, ret = 0, saved_errno = errno;
145 const char *subdir;
146 int count, option_count;
147 const char **new_argv;
148 const char *alias_command;
149 char *alias_string;
150 int unused_nongit;
151
152 subdir = setup_git_directory_gently(&unused_nongit);
153
154 alias_command = (*argv)[0];
155 alias_string = alias_lookup(alias_command);
156 if (alias_string) {
157 if (alias_string[0] == '!') {
158 if (*argcp > 1) {
159 struct strbuf buf;
160
161 strbuf_init(&buf, PATH_MAX);
162 strbuf_addstr(&buf, alias_string);
163 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
164 free(alias_string);
165 alias_string = buf.buf;
166 }
167 trace_printf("trace: alias to shell cmd: %s => %s\n",
168 alias_command, alias_string + 1);
169 ret = system(alias_string + 1);
170 if (ret >= 0 && WIFEXITED(ret) &&
171 WEXITSTATUS(ret) != 127)
172 exit(WEXITSTATUS(ret));
173 die("Failed to run '%s' when expanding alias '%s'",
174 alias_string + 1, alias_command);
175 }
176 count = split_cmdline(alias_string, &new_argv);
177 if (count < 0)
178 die("Bad alias.%s string", alias_command);
179 option_count = handle_options(&new_argv, &count, &envchanged);
180 if (envchanged)
181 die("alias '%s' changes environment variables\n"
182 "You can use '!git' in the alias to do this.",
183 alias_command);
184 memmove(new_argv - option_count, new_argv,
185 count * sizeof(char *));
186 new_argv -= option_count;
187
188 if (count < 1)
189 die("empty alias for %s", alias_command);
190
191 if (!strcmp(alias_command, new_argv[0]))
192 die("recursive alias: %s", alias_command);
193
194 trace_argv_printf(new_argv,
195 "trace: alias expansion: %s =>",
196 alias_command);
197
198 new_argv = xrealloc(new_argv, sizeof(char *) *
199 (count + *argcp));
200 /* insert after command name */
201 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
202
203 *argv = new_argv;
204 *argcp += count - 1;
205
206 ret = 1;
207 }
208
209 if (subdir && chdir(subdir))
210 die_errno("Cannot change to '%s'", subdir);
211
212 errno = saved_errno;
213
214 return ret;
215 }
216
217 const char git_version_string[] = GIT_VERSION;
218
219 #define RUN_SETUP (1<<0)
220 #define USE_PAGER (1<<1)
221 /*
222 * require working tree to be present -- anything uses this needs
223 * RUN_SETUP for reading from the configuration file.
224 */
225 #define NEED_WORK_TREE (1<<2)
226
227 struct cmd_struct {
228 const char *cmd;
229 int (*fn)(int, const char **, const char *);
230 int option;
231 };
232
233 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
234 {
235 int status, help;
236 struct stat st;
237 const char *prefix;
238
239 prefix = NULL;
240 help = argc == 2 && !strcmp(argv[1], "-h");
241 if (!help) {
242 if (p->option & RUN_SETUP)
243 prefix = setup_git_directory();
244
245 if (use_pager == -1 && p->option & RUN_SETUP)
246 use_pager = check_pager_config(p->cmd);
247 if (use_pager == -1 && p->option & USE_PAGER)
248 use_pager = 1;
249 }
250 commit_pager_choice();
251
252 if (!help && p->option & NEED_WORK_TREE)
253 setup_work_tree();
254
255 trace_argv_printf(argv, "trace: built-in: git");
256
257 status = p->fn(argc, argv, prefix);
258 if (status)
259 return status;
260
261 /* Somebody closed stdout? */
262 if (fstat(fileno(stdout), &st))
263 return 0;
264 /* Ignore write errors for pipes and sockets.. */
265 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
266 return 0;
267
268 /* Check for ENOSPC and EIO errors.. */
269 if (fflush(stdout))
270 die_errno("write failure on standard output");
271 if (ferror(stdout))
272 die("unknown write failure on standard output");
273 if (fclose(stdout))
274 die_errno("close failed on standard output");
275 return 0;
276 }
277
278 static void handle_internal_command(int argc, const char **argv)
279 {
280 const char *cmd = argv[0];
281 static struct cmd_struct commands[] = {
282 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
283 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
284 { "annotate", cmd_annotate, RUN_SETUP },
285 { "apply", cmd_apply },
286 { "archive", cmd_archive },
287 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
288 { "blame", cmd_blame, RUN_SETUP },
289 { "branch", cmd_branch, RUN_SETUP },
290 { "bundle", cmd_bundle },
291 { "cat-file", cmd_cat_file, RUN_SETUP },
292 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
293 { "checkout-index", cmd_checkout_index,
294 RUN_SETUP | NEED_WORK_TREE},
295 { "check-ref-format", cmd_check_ref_format },
296 { "check-attr", cmd_check_attr, RUN_SETUP },
297 { "cherry", cmd_cherry, RUN_SETUP },
298 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
299 { "clone", cmd_clone },
300 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
301 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
302 { "commit-tree", cmd_commit_tree, RUN_SETUP },
303 { "config", cmd_config },
304 { "count-objects", cmd_count_objects, RUN_SETUP },
305 { "describe", cmd_describe, RUN_SETUP },
306 { "diff", cmd_diff },
307 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
308 { "diff-index", cmd_diff_index, RUN_SETUP },
309 { "diff-tree", cmd_diff_tree, RUN_SETUP },
310 { "fast-export", cmd_fast_export, RUN_SETUP },
311 { "fetch", cmd_fetch, RUN_SETUP },
312 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
313 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
314 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
315 { "format-patch", cmd_format_patch, RUN_SETUP },
316 { "fsck", cmd_fsck, RUN_SETUP },
317 { "fsck-objects", cmd_fsck, RUN_SETUP },
318 { "gc", cmd_gc, RUN_SETUP },
319 { "get-tar-commit-id", cmd_get_tar_commit_id },
320 { "grep", cmd_grep, USE_PAGER },
321 { "hash-object", cmd_hash_object },
322 { "help", cmd_help },
323 { "init", cmd_init_db },
324 { "init-db", cmd_init_db },
325 { "log", cmd_log, RUN_SETUP | USE_PAGER },
326 { "ls-files", cmd_ls_files, RUN_SETUP },
327 { "ls-tree", cmd_ls_tree, RUN_SETUP },
328 { "ls-remote", cmd_ls_remote },
329 { "mailinfo", cmd_mailinfo },
330 { "mailsplit", cmd_mailsplit },
331 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
332 { "merge-base", cmd_merge_base, RUN_SETUP },
333 { "merge-file", cmd_merge_file },
334 { "merge-index", cmd_merge_index, RUN_SETUP },
335 { "merge-ours", cmd_merge_ours, RUN_SETUP },
336 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
337 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
338 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
339 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
340 { "merge-tree", cmd_merge_tree, RUN_SETUP },
341 { "mktag", cmd_mktag, RUN_SETUP },
342 { "mktree", cmd_mktree, RUN_SETUP },
343 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
344 { "name-rev", cmd_name_rev, RUN_SETUP },
345 { "pack-objects", cmd_pack_objects, RUN_SETUP },
346 { "patch-id", cmd_patch_id },
347 { "peek-remote", cmd_ls_remote },
348 { "pickaxe", cmd_blame, RUN_SETUP },
349 { "prune", cmd_prune, RUN_SETUP },
350 { "prune-packed", cmd_prune_packed, RUN_SETUP },
351 { "push", cmd_push, RUN_SETUP },
352 { "read-tree", cmd_read_tree, RUN_SETUP },
353 { "receive-pack", cmd_receive_pack },
354 { "reflog", cmd_reflog, RUN_SETUP },
355 { "remote", cmd_remote, RUN_SETUP },
356 { "replace", cmd_replace, RUN_SETUP },
357 { "repo-config", cmd_config },
358 { "rerere", cmd_rerere, RUN_SETUP },
359 { "reset", cmd_reset, RUN_SETUP },
360 { "rev-list", cmd_rev_list, RUN_SETUP },
361 { "rev-parse", cmd_rev_parse },
362 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
363 { "rm", cmd_rm, RUN_SETUP },
364 { "send-pack", cmd_send_pack, RUN_SETUP },
365 { "shortlog", cmd_shortlog, USE_PAGER },
366 { "show-branch", cmd_show_branch, RUN_SETUP },
367 { "show", cmd_show, RUN_SETUP | USE_PAGER },
368 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
369 { "stripspace", cmd_stripspace },
370 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
371 { "tag", cmd_tag, RUN_SETUP },
372 { "tar-tree", cmd_tar_tree },
373 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
374 { "update-index", cmd_update_index, RUN_SETUP },
375 { "update-ref", cmd_update_ref, RUN_SETUP },
376 { "update-server-info", cmd_update_server_info, RUN_SETUP },
377 { "upload-archive", cmd_upload_archive },
378 { "var", cmd_var },
379 { "verify-tag", cmd_verify_tag, RUN_SETUP },
380 { "version", cmd_version },
381 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
382 { "write-tree", cmd_write_tree, RUN_SETUP },
383 { "verify-pack", cmd_verify_pack },
384 { "show-ref", cmd_show_ref, RUN_SETUP },
385 { "pack-refs", cmd_pack_refs, RUN_SETUP },
386 };
387 int i;
388 static const char ext[] = STRIP_EXTENSION;
389
390 if (sizeof(ext) > 1) {
391 i = strlen(argv[0]) - strlen(ext);
392 if (i > 0 && !strcmp(argv[0] + i, ext)) {
393 char *argv0 = xstrdup(argv[0]);
394 argv[0] = cmd = argv0;
395 argv0[i] = '\0';
396 }
397 }
398
399 /* Turn "git cmd --help" into "git help cmd" */
400 if (argc > 1 && !strcmp(argv[1], "--help")) {
401 argv[1] = argv[0];
402 argv[0] = cmd = "help";
403 }
404
405 for (i = 0; i < ARRAY_SIZE(commands); i++) {
406 struct cmd_struct *p = commands+i;
407 if (strcmp(p->cmd, cmd))
408 continue;
409 exit(run_builtin(p, argc, argv));
410 }
411 }
412
413 static void execv_dashed_external(const char **argv)
414 {
415 struct strbuf cmd = STRBUF_INIT;
416 const char *tmp;
417 int status;
418
419 strbuf_addf(&cmd, "git-%s", argv[0]);
420
421 /*
422 * argv[0] must be the git command, but the argv array
423 * belongs to the caller, and may be reused in
424 * subsequent loop iterations. Save argv[0] and
425 * restore it on error.
426 */
427 tmp = argv[0];
428 argv[0] = cmd.buf;
429
430 trace_argv_printf(argv, "trace: exec:");
431
432 /*
433 * if we fail because the command is not found, it is
434 * OK to return. Otherwise, we just pass along the status code.
435 */
436 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
437 if (status >= 0 || errno != ENOENT)
438 exit(status);
439
440 argv[0] = tmp;
441
442 strbuf_release(&cmd);
443 }
444
445 static int run_argv(int *argcp, const char ***argv)
446 {
447 int done_alias = 0;
448
449 while (1) {
450 /* See if it's an internal command */
451 handle_internal_command(*argcp, *argv);
452
453 /* .. then try the external ones */
454 execv_dashed_external(*argv);
455
456 /* It could be an alias -- this works around the insanity
457 * of overriding "git log" with "git show" by having
458 * alias.log = show
459 */
460 if (done_alias || !handle_alias(argcp, argv))
461 break;
462 done_alias = 1;
463 }
464
465 return done_alias;
466 }
467
468
469 int main(int argc, const char **argv)
470 {
471 const char *cmd;
472
473 cmd = git_extract_argv0_path(argv[0]);
474 if (!cmd)
475 cmd = "git-help";
476
477 /*
478 * "git-xxxx" is the same as "git xxxx", but we obviously:
479 *
480 * - cannot take flags in between the "git" and the "xxxx".
481 * - cannot execute it externally (since it would just do
482 * the same thing over again)
483 *
484 * So we just directly call the internal command handler, and
485 * die if that one cannot handle it.
486 */
487 if (!prefixcmp(cmd, "git-")) {
488 cmd += 4;
489 argv[0] = cmd;
490 handle_internal_command(argc, argv);
491 die("cannot handle %s internally", cmd);
492 }
493
494 /* Look for flags.. */
495 argv++;
496 argc--;
497 handle_options(&argv, &argc, NULL);
498 commit_pager_choice();
499 if (argc > 0) {
500 if (!prefixcmp(argv[0], "--"))
501 argv[0] += 2;
502 } else {
503 /* The user didn't specify a command; give them help */
504 printf("usage: %s\n\n", git_usage_string);
505 list_common_cmds_help();
506 printf("\n%s\n", git_more_info_string);
507 exit(1);
508 }
509 cmd = argv[0];
510
511 /*
512 * We use PATH to find git commands, but we prepend some higher
513 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
514 * environment, and the $(gitexecdir) from the Makefile at build
515 * time.
516 */
517 setup_path();
518
519 while (1) {
520 static int done_help = 0;
521 static int was_alias = 0;
522 was_alias = run_argv(&argc, &argv);
523 if (errno != ENOENT)
524 break;
525 if (was_alias) {
526 fprintf(stderr, "Expansion of alias '%s' failed; "
527 "'%s' is not a git-command\n",
528 cmd, argv[0]);
529 exit(1);
530 }
531 if (!done_help) {
532 cmd = argv[0] = help_unknown_cmd(cmd);
533 done_help = 1;
534 } else
535 break;
536 }
537
538 fprintf(stderr, "Failed to run command '%s': %s\n",
539 cmd, strerror(errno));
540
541 return 1;
542 }