Merge branch 'jc/bare'
[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] [--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)
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 (!strncmp(cmd, "--exec-path", 11)) {
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 (*argv)++;
68 (*argc)--;
69 } else if (!strncmp(cmd, "--git-dir=", 10)) {
70 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
71 } else if (!strcmp(cmd, "--bare")) {
72 static char git_dir[PATH_MAX+1];
73 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
74 } else {
75 fprintf(stderr, "Unknown option: %s\n", cmd);
76 usage(git_usage_string);
77 }
78
79 (*argv)++;
80 (*argc)--;
81 handled++;
82 }
83 return handled;
84 }
85
86 static const char *alias_command;
87 static char *alias_string;
88
89 static int git_alias_config(const char *var, const char *value)
90 {
91 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
92 alias_string = xstrdup(value);
93 }
94 return 0;
95 }
96
97 static int split_cmdline(char *cmdline, const char ***argv)
98 {
99 int src, dst, count = 0, size = 16;
100 char quoted = 0;
101
102 *argv = malloc(sizeof(char*) * size);
103
104 /* split alias_string */
105 (*argv)[count++] = cmdline;
106 for (src = dst = 0; cmdline[src];) {
107 char c = cmdline[src];
108 if (!quoted && isspace(c)) {
109 cmdline[dst++] = 0;
110 while (cmdline[++src]
111 && isspace(cmdline[src]))
112 ; /* skip */
113 if (count >= size) {
114 size += 16;
115 *argv = xrealloc(*argv, sizeof(char*) * size);
116 }
117 (*argv)[count++] = cmdline + dst;
118 } else if(!quoted && (c == '\'' || c == '"')) {
119 quoted = c;
120 src++;
121 } else if (c == quoted) {
122 quoted = 0;
123 src++;
124 } else {
125 if (c == '\\' && quoted != '\'') {
126 src++;
127 c = cmdline[src];
128 if (!c) {
129 free(*argv);
130 *argv = NULL;
131 return error("cmdline ends with \\");
132 }
133 }
134 cmdline[dst++] = c;
135 src++;
136 }
137 }
138
139 cmdline[dst] = 0;
140
141 if (quoted) {
142 free(*argv);
143 *argv = NULL;
144 return error("unclosed quote");
145 }
146
147 return count;
148 }
149
150 static int handle_alias(int *argcp, const char ***argv)
151 {
152 int nongit = 0, ret = 0, saved_errno = errno;
153 const char *subdir;
154 int count, option_count;
155 const char** new_argv;
156
157 subdir = setup_git_directory_gently(&nongit);
158
159 alias_command = (*argv)[0];
160 git_config(git_alias_config);
161 if (alias_string) {
162 count = split_cmdline(alias_string, &new_argv);
163 option_count = handle_options(&new_argv, &count);
164 memmove(new_argv - option_count, new_argv,
165 count * sizeof(char *));
166 new_argv -= option_count;
167
168 if (count < 1)
169 die("empty alias for %s", alias_command);
170
171 if (!strcmp(alias_command, new_argv[0]))
172 die("recursive alias: %s", alias_command);
173
174 trace_argv_printf(new_argv, count,
175 "trace: alias expansion: %s =>",
176 alias_command);
177
178 new_argv = xrealloc(new_argv, sizeof(char*) *
179 (count + *argcp + 1));
180 /* insert after command name */
181 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
182 new_argv[count+*argcp] = NULL;
183
184 *argv = new_argv;
185 *argcp += count - 1;
186
187 ret = 1;
188 }
189
190 if (subdir)
191 chdir(subdir);
192
193 errno = saved_errno;
194
195 return ret;
196 }
197
198 const char git_version_string[] = GIT_VERSION;
199
200 #define RUN_SETUP (1<<0)
201 #define USE_PAGER (1<<1)
202 /*
203 * require working tree to be present -- anything uses this needs
204 * RUN_SETUP for reading from the configuration file.
205 */
206 #define NOT_BARE (1<<2)
207
208 static void handle_internal_command(int argc, const char **argv, char **envp)
209 {
210 const char *cmd = argv[0];
211 static struct cmd_struct {
212 const char *cmd;
213 int (*fn)(int, const char **, const char *);
214 int option;
215 } commands[] = {
216 { "add", cmd_add, RUN_SETUP | NOT_BARE },
217 { "annotate", cmd_annotate, },
218 { "apply", cmd_apply },
219 { "archive", cmd_archive },
220 { "blame", cmd_blame, RUN_SETUP | USE_PAGER },
221 { "branch", cmd_branch, RUN_SETUP },
222 { "cat-file", cmd_cat_file, RUN_SETUP },
223 { "checkout-index", cmd_checkout_index, RUN_SETUP },
224 { "check-ref-format", cmd_check_ref_format },
225 { "cherry", cmd_cherry, RUN_SETUP },
226 { "commit-tree", cmd_commit_tree, RUN_SETUP },
227 { "count-objects", cmd_count_objects, RUN_SETUP },
228 { "describe", cmd_describe, RUN_SETUP },
229 { "diff", cmd_diff, RUN_SETUP | USE_PAGER },
230 { "diff-files", cmd_diff_files, RUN_SETUP },
231 { "diff-index", cmd_diff_index, RUN_SETUP },
232 { "diff-stages", cmd_diff_stages, RUN_SETUP },
233 { "diff-tree", cmd_diff_tree, RUN_SETUP },
234 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
235 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
236 { "format-patch", cmd_format_patch, RUN_SETUP },
237 { "get-tar-commit-id", cmd_get_tar_commit_id },
238 { "grep", cmd_grep, RUN_SETUP },
239 { "help", cmd_help },
240 { "init", cmd_init_db },
241 { "init-db", cmd_init_db },
242 { "log", cmd_log, RUN_SETUP | USE_PAGER },
243 { "ls-files", cmd_ls_files, RUN_SETUP },
244 { "ls-tree", cmd_ls_tree, RUN_SETUP },
245 { "mailinfo", cmd_mailinfo },
246 { "mailsplit", cmd_mailsplit },
247 { "merge-file", cmd_merge_file },
248 { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
249 { "name-rev", cmd_name_rev, RUN_SETUP },
250 { "pack-objects", cmd_pack_objects, RUN_SETUP },
251 { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
252 { "prune", cmd_prune, RUN_SETUP },
253 { "prune-packed", cmd_prune_packed, RUN_SETUP },
254 { "push", cmd_push, RUN_SETUP },
255 { "read-tree", cmd_read_tree, RUN_SETUP },
256 { "reflog", cmd_reflog, RUN_SETUP },
257 { "repo-config", cmd_repo_config },
258 { "rerere", cmd_rerere, RUN_SETUP },
259 { "rev-list", cmd_rev_list, RUN_SETUP },
260 { "rev-parse", cmd_rev_parse, RUN_SETUP },
261 { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
262 { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
263 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
264 { "show-branch", cmd_show_branch, RUN_SETUP },
265 { "show", cmd_show, RUN_SETUP | USE_PAGER },
266 { "stripspace", cmd_stripspace },
267 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
268 { "tar-tree", cmd_tar_tree },
269 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
270 { "update-index", cmd_update_index, RUN_SETUP },
271 { "update-ref", cmd_update_ref, RUN_SETUP },
272 { "upload-archive", cmd_upload_archive },
273 { "version", cmd_version },
274 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
275 { "write-tree", cmd_write_tree, RUN_SETUP },
276 { "verify-pack", cmd_verify_pack },
277 { "show-ref", cmd_show_ref, RUN_SETUP },
278 { "pack-refs", cmd_pack_refs, RUN_SETUP },
279 };
280 int i;
281
282 /* Turn "git cmd --help" into "git help cmd" */
283 if (argc > 1 && !strcmp(argv[1], "--help")) {
284 argv[1] = argv[0];
285 argv[0] = cmd = "help";
286 }
287
288 for (i = 0; i < ARRAY_SIZE(commands); i++) {
289 struct cmd_struct *p = commands+i;
290 const char *prefix;
291 if (strcmp(p->cmd, cmd))
292 continue;
293
294 prefix = NULL;
295 if (p->option & RUN_SETUP)
296 prefix = setup_git_directory();
297 if (p->option & USE_PAGER)
298 setup_pager();
299 if ((p->option & NOT_BARE) && is_bare_repository())
300 die("%s cannot be used in a bare git directory", cmd);
301 trace_argv_printf(argv, argc, "trace: built-in: git");
302
303 exit(p->fn(argc, argv, prefix));
304 }
305 }
306
307 int main(int argc, const char **argv, char **envp)
308 {
309 const char *cmd = argv[0] ? argv[0] : "git-help";
310 char *slash = strrchr(cmd, '/');
311 const char *exec_path = NULL;
312 int done_alias = 0;
313
314 /*
315 * Take the basename of argv[0] as the command
316 * name, and the dirname as the default exec_path
317 * if it's an absolute path and we don't have
318 * anything better.
319 */
320 if (slash) {
321 *slash++ = 0;
322 if (*cmd == '/')
323 exec_path = cmd;
324 cmd = slash;
325 }
326
327 /*
328 * "git-xxxx" is the same as "git xxxx", but we obviously:
329 *
330 * - cannot take flags in between the "git" and the "xxxx".
331 * - cannot execute it externally (since it would just do
332 * the same thing over again)
333 *
334 * So we just directly call the internal command handler, and
335 * die if that one cannot handle it.
336 */
337 if (!strncmp(cmd, "git-", 4)) {
338 cmd += 4;
339 argv[0] = cmd;
340 handle_internal_command(argc, argv, envp);
341 die("cannot handle %s internally", cmd);
342 }
343
344 /* Look for flags.. */
345 argv++;
346 argc--;
347 handle_options(&argv, &argc);
348 if (argc > 0) {
349 if (!strncmp(argv[0], "--", 2))
350 argv[0] += 2;
351 } else {
352 /* Default command: "help" */
353 argv[0] = "help";
354 argc = 1;
355 }
356 cmd = argv[0];
357
358 /*
359 * We search for git commands in the following order:
360 * - git_exec_path()
361 * - the path of the "git" command if we could find it
362 * in $0
363 * - the regular PATH.
364 */
365 if (exec_path)
366 prepend_to_path(exec_path, strlen(exec_path));
367 exec_path = git_exec_path();
368 prepend_to_path(exec_path, strlen(exec_path));
369
370 while (1) {
371 /* See if it's an internal command */
372 handle_internal_command(argc, argv, envp);
373
374 /* .. then try the external ones */
375 execv_git_cmd(argv);
376
377 /* It could be an alias -- this works around the insanity
378 * of overriding "git log" with "git show" by having
379 * alias.log = show
380 */
381 if (done_alias || !handle_alias(&argc, &argv))
382 break;
383 done_alias = 1;
384 }
385
386 if (errno == ENOENT)
387 help_unknown_cmd(cmd);
388
389 fprintf(stderr, "Failed to run command '%s': %s\n",
390 cmd, strerror(errno));
391
392 return 1;
393 }