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