gitweb: Clearly distinguish regexp / exact match searches
[git/git.git] / git.c
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5
6 const char git_usage_string[] =
7 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
8
9 static int handle_options(const char*** argv, int* argc, int* envchanged)
10 {
11 int handled = 0;
12
13 while (*argc > 0) {
14 const char *cmd = (*argv)[0];
15 if (cmd[0] != '-')
16 break;
17
18 /*
19 * For legacy reasons, the "version" and "help"
20 * commands can be written with "--" prepended
21 * to make them look like flags.
22 */
23 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
24 break;
25
26 /*
27 * Check remaining flags.
28 */
29 if (!prefixcmp(cmd, "--exec-path")) {
30 cmd += 11;
31 if (*cmd == '=')
32 git_set_argv_exec_path(cmd + 1);
33 else {
34 puts(git_exec_path());
35 exit(0);
36 }
37 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
38 setup_pager();
39 } else if (!strcmp(cmd, "--no-pager")) {
40 setenv("GIT_PAGER", "cat", 1);
41 if (envchanged)
42 *envchanged = 1;
43 } else if (!strcmp(cmd, "--git-dir")) {
44 if (*argc < 2) {
45 fprintf(stderr, "No directory given for --git-dir.\n" );
46 usage(git_usage_string);
47 }
48 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
49 if (envchanged)
50 *envchanged = 1;
51 (*argv)++;
52 (*argc)--;
53 handled++;
54 } else if (!prefixcmp(cmd, "--git-dir=")) {
55 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
56 if (envchanged)
57 *envchanged = 1;
58 } else if (!strcmp(cmd, "--work-tree")) {
59 if (*argc < 2) {
60 fprintf(stderr, "No directory given for --work-tree.\n" );
61 usage(git_usage_string);
62 }
63 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
64 if (envchanged)
65 *envchanged = 1;
66 (*argv)++;
67 (*argc)--;
68 } else if (!prefixcmp(cmd, "--work-tree=")) {
69 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
70 if (envchanged)
71 *envchanged = 1;
72 } else if (!strcmp(cmd, "--bare")) {
73 static char git_dir[PATH_MAX+1];
74 is_bare_repository_cfg = 1;
75 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
76 if (envchanged)
77 *envchanged = 1;
78 } else {
79 fprintf(stderr, "Unknown option: %s\n", cmd);
80 usage(git_usage_string);
81 }
82
83 (*argv)++;
84 (*argc)--;
85 handled++;
86 }
87 return handled;
88 }
89
90 static const char *alias_command;
91 static char *alias_string;
92
93 static int git_alias_config(const char *var, const char *value)
94 {
95 if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
96 if (!value)
97 return config_error_nonbool(var);
98 alias_string = xstrdup(value);
99 }
100 return 0;
101 }
102
103 static int split_cmdline(char *cmdline, const char ***argv)
104 {
105 int src, dst, count = 0, size = 16;
106 char quoted = 0;
107
108 *argv = xmalloc(sizeof(char*) * size);
109
110 /* split alias_string */
111 (*argv)[count++] = cmdline;
112 for (src = dst = 0; cmdline[src];) {
113 char c = cmdline[src];
114 if (!quoted && isspace(c)) {
115 cmdline[dst++] = 0;
116 while (cmdline[++src]
117 && isspace(cmdline[src]))
118 ; /* skip */
119 if (count >= size) {
120 size += 16;
121 *argv = xrealloc(*argv, sizeof(char*) * size);
122 }
123 (*argv)[count++] = cmdline + dst;
124 } else if(!quoted && (c == '\'' || c == '"')) {
125 quoted = c;
126 src++;
127 } else if (c == quoted) {
128 quoted = 0;
129 src++;
130 } else {
131 if (c == '\\' && quoted != '\'') {
132 src++;
133 c = cmdline[src];
134 if (!c) {
135 free(*argv);
136 *argv = NULL;
137 return error("cmdline ends with \\");
138 }
139 }
140 cmdline[dst++] = c;
141 src++;
142 }
143 }
144
145 cmdline[dst] = 0;
146
147 if (quoted) {
148 free(*argv);
149 *argv = NULL;
150 return error("unclosed quote");
151 }
152
153 return count;
154 }
155
156 static int handle_alias(int *argcp, const char ***argv)
157 {
158 int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
159 const char *subdir;
160 int count, option_count;
161 const char** new_argv;
162
163 subdir = setup_git_directory_gently(&nongit);
164
165 alias_command = (*argv)[0];
166 git_config(git_alias_config);
167 if (alias_string) {
168 if (alias_string[0] == '!') {
169 if (*argcp > 1) {
170 struct strbuf buf;
171
172 strbuf_init(&buf, PATH_MAX);
173 strbuf_addstr(&buf, alias_string);
174 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
175 free(alias_string);
176 alias_string = buf.buf;
177 }
178 trace_printf("trace: alias to shell cmd: %s => %s\n",
179 alias_command, alias_string + 1);
180 ret = system(alias_string + 1);
181 if (ret >= 0 && WIFEXITED(ret) &&
182 WEXITSTATUS(ret) != 127)
183 exit(WEXITSTATUS(ret));
184 die("Failed to run '%s' when expanding alias '%s'\n",
185 alias_string + 1, alias_command);
186 }
187 count = split_cmdline(alias_string, &new_argv);
188 option_count = handle_options(&new_argv, &count, &envchanged);
189 if (envchanged)
190 die("alias '%s' changes environment variables\n"
191 "You can use '!git' in the alias to do this.",
192 alias_command);
193 memmove(new_argv - option_count, new_argv,
194 count * sizeof(char *));
195 new_argv -= option_count;
196
197 if (count < 1)
198 die("empty alias for %s", alias_command);
199
200 if (!strcmp(alias_command, new_argv[0]))
201 die("recursive alias: %s", alias_command);
202
203 trace_argv_printf(new_argv,
204 "trace: alias expansion: %s =>",
205 alias_command);
206
207 new_argv = xrealloc(new_argv, sizeof(char*) *
208 (count + *argcp + 1));
209 /* insert after command name */
210 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
211 new_argv[count+*argcp] = NULL;
212
213 *argv = new_argv;
214 *argcp += count - 1;
215
216 ret = 1;
217 }
218
219 if (subdir)
220 chdir(subdir);
221
222 errno = saved_errno;
223
224 return ret;
225 }
226
227 const char git_version_string[] = GIT_VERSION;
228
229 #define RUN_SETUP (1<<0)
230 #define USE_PAGER (1<<1)
231 /*
232 * require working tree to be present -- anything uses this needs
233 * RUN_SETUP for reading from the configuration file.
234 */
235 #define NEED_WORK_TREE (1<<2)
236
237 struct cmd_struct {
238 const char *cmd;
239 int (*fn)(int, const char **, const char *);
240 int option;
241 };
242
243 static int run_command(struct cmd_struct *p, int argc, const char **argv)
244 {
245 int status;
246 struct stat st;
247 const char *prefix;
248
249 prefix = NULL;
250 if (p->option & RUN_SETUP)
251 prefix = setup_git_directory();
252 if (p->option & USE_PAGER)
253 setup_pager();
254 if (p->option & NEED_WORK_TREE)
255 setup_work_tree();
256
257 trace_argv_printf(argv, "trace: built-in: git");
258
259 status = p->fn(argc, argv, prefix);
260 if (status)
261 return status & 0xff;
262
263 /* Somebody closed stdout? */
264 if (fstat(fileno(stdout), &st))
265 return 0;
266 /* Ignore write errors for pipes and sockets.. */
267 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
268 return 0;
269
270 /* Check for ENOSPC and EIO errors.. */
271 if (fflush(stdout))
272 die("write failure on standard output: %s", strerror(errno));
273 if (ferror(stdout))
274 die("unknown write failure on standard output");
275 if (fclose(stdout))
276 die("close failed on standard output: %s", strerror(errno));
277 return 0;
278 }
279
280 static void handle_internal_command(int argc, const char **argv)
281 {
282 const char *cmd = argv[0];
283 static struct cmd_struct commands[] = {
284 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
285 { "annotate", cmd_annotate, RUN_SETUP },
286 { "apply", cmd_apply },
287 { "archive", cmd_archive },
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-index", cmd_checkout_index,
293 RUN_SETUP | NEED_WORK_TREE},
294 { "check-ref-format", cmd_check_ref_format },
295 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
296 { "cherry", cmd_cherry, RUN_SETUP },
297 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
298 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
299 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
300 { "commit-tree", cmd_commit_tree, RUN_SETUP },
301 { "config", cmd_config },
302 { "count-objects", cmd_count_objects, RUN_SETUP },
303 { "describe", cmd_describe, RUN_SETUP },
304 { "diff", cmd_diff },
305 { "diff-files", cmd_diff_files },
306 { "diff-index", cmd_diff_index, RUN_SETUP },
307 { "diff-tree", cmd_diff_tree, RUN_SETUP },
308 { "fast-export", cmd_fast_export, RUN_SETUP },
309 { "fetch", cmd_fetch, RUN_SETUP },
310 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
311 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
312 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
313 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
314 { "format-patch", cmd_format_patch, RUN_SETUP },
315 { "fsck", cmd_fsck, RUN_SETUP },
316 { "fsck-objects", cmd_fsck, RUN_SETUP },
317 { "gc", cmd_gc, RUN_SETUP },
318 { "get-tar-commit-id", cmd_get_tar_commit_id },
319 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
320 { "help", cmd_help },
321 #ifndef NO_CURL
322 { "http-fetch", cmd_http_fetch, RUN_SETUP },
323 #endif
324 { "init", cmd_init_db },
325 { "init-db", cmd_init_db },
326 { "log", cmd_log, RUN_SETUP | USE_PAGER },
327 { "ls-files", cmd_ls_files, RUN_SETUP },
328 { "ls-tree", cmd_ls_tree, RUN_SETUP },
329 { "ls-remote", cmd_ls_remote },
330 { "mailinfo", cmd_mailinfo },
331 { "mailsplit", cmd_mailsplit },
332 { "merge-base", cmd_merge_base, RUN_SETUP },
333 { "merge-file", cmd_merge_file },
334 { "merge-ours", cmd_merge_ours, RUN_SETUP },
335 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
336 { "name-rev", cmd_name_rev, RUN_SETUP },
337 { "pack-objects", cmd_pack_objects, RUN_SETUP },
338 { "peek-remote", cmd_ls_remote },
339 { "pickaxe", cmd_blame, RUN_SETUP },
340 { "prune", cmd_prune, RUN_SETUP },
341 { "prune-packed", cmd_prune_packed, RUN_SETUP },
342 { "push", cmd_push, RUN_SETUP },
343 { "read-tree", cmd_read_tree, RUN_SETUP },
344 { "reflog", cmd_reflog, RUN_SETUP },
345 { "repo-config", cmd_config },
346 { "rerere", cmd_rerere, RUN_SETUP },
347 { "reset", cmd_reset, RUN_SETUP },
348 { "rev-list", cmd_rev_list, RUN_SETUP },
349 { "rev-parse", cmd_rev_parse },
350 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
351 { "rm", cmd_rm, RUN_SETUP },
352 { "send-pack", cmd_send_pack, RUN_SETUP },
353 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
354 { "show-branch", cmd_show_branch, RUN_SETUP },
355 { "show", cmd_show, RUN_SETUP | USE_PAGER },
356 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
357 { "stripspace", cmd_stripspace },
358 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
359 { "tag", cmd_tag, RUN_SETUP },
360 { "tar-tree", cmd_tar_tree },
361 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
362 { "update-index", cmd_update_index, RUN_SETUP },
363 { "update-ref", cmd_update_ref, RUN_SETUP },
364 { "upload-archive", cmd_upload_archive },
365 { "verify-tag", cmd_verify_tag, RUN_SETUP },
366 { "version", cmd_version },
367 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
368 { "write-tree", cmd_write_tree, RUN_SETUP },
369 { "verify-pack", cmd_verify_pack },
370 { "show-ref", cmd_show_ref, RUN_SETUP },
371 { "pack-refs", cmd_pack_refs, RUN_SETUP },
372 };
373 int i;
374
375 /* Turn "git cmd --help" into "git help cmd" */
376 if (argc > 1 && !strcmp(argv[1], "--help")) {
377 argv[1] = argv[0];
378 argv[0] = cmd = "help";
379 }
380
381 for (i = 0; i < ARRAY_SIZE(commands); i++) {
382 struct cmd_struct *p = commands+i;
383 if (strcmp(p->cmd, cmd))
384 continue;
385 exit(run_command(p, argc, argv));
386 }
387 }
388
389 int main(int argc, const char **argv)
390 {
391 const char *cmd = argv[0] ? argv[0] : "git-help";
392 char *slash = strrchr(cmd, '/');
393 const char *cmd_path = NULL;
394 int done_alias = 0;
395
396 /*
397 * Take the basename of argv[0] as the command
398 * name, and the dirname as the default exec_path
399 * if we don't have anything better.
400 */
401 if (slash) {
402 *slash++ = 0;
403 cmd_path = cmd;
404 cmd = slash;
405 }
406
407 /*
408 * "git-xxxx" is the same as "git xxxx", but we obviously:
409 *
410 * - cannot take flags in between the "git" and the "xxxx".
411 * - cannot execute it externally (since it would just do
412 * the same thing over again)
413 *
414 * So we just directly call the internal command handler, and
415 * die if that one cannot handle it.
416 */
417 if (!prefixcmp(cmd, "git-")) {
418 cmd += 4;
419 argv[0] = cmd;
420 handle_internal_command(argc, argv);
421 die("cannot handle %s internally", cmd);
422 }
423
424 /* Look for flags.. */
425 argv++;
426 argc--;
427 handle_options(&argv, &argc, NULL);
428 if (argc > 0) {
429 if (!prefixcmp(argv[0], "--"))
430 argv[0] += 2;
431 } else {
432 /* The user didn't specify a command; give them help */
433 printf("usage: %s\n\n", git_usage_string);
434 list_common_cmds_help();
435 exit(1);
436 }
437 cmd = argv[0];
438
439 /*
440 * We use PATH to find git commands, but we prepend some higher
441 * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
442 * environment, and the $(gitexecdir) from the Makefile at build
443 * time.
444 */
445 setup_path(cmd_path);
446
447 while (1) {
448 /* See if it's an internal command */
449 handle_internal_command(argc, argv);
450
451 /* .. then try the external ones */
452 execv_git_cmd(argv);
453
454 /* It could be an alias -- this works around the insanity
455 * of overriding "git log" with "git show" by having
456 * alias.log = show
457 */
458 if (done_alias || !handle_alias(&argc, &argv))
459 break;
460 done_alias = 1;
461 }
462
463 if (errno == ENOENT) {
464 if (done_alias) {
465 fprintf(stderr, "Expansion of alias '%s' failed; "
466 "'%s' is not a git-command\n",
467 cmd, argv[0]);
468 exit(1);
469 }
470 help_unknown_cmd(cmd);
471 }
472
473 fprintf(stderr, "Failed to run command '%s': %s\n",
474 cmd, strerror(errno));
475
476 return 1;
477 }