scripts: Add placeholders for OPTIONS_SPEC
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
77cb17e9 2#include "exec_cmd.h"
2b11e317 3#include "cache.h"
575ba9d6 4#include "quote.h"
8e49d503 5
822a7d50 6const char git_usage_string[] =
463a849d 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]";
822a7d50 8
4394efec 9static int handle_options(const char*** argv, int* argc, int* envchanged)
4ab243a9
JS
10{
11 int handled = 0;
12
13 while (*argc > 0) {
14 const char *cmd = (*argv)[0];
15 if (cmd[0] != '-')
16 break;
17
6acbcb92
JS
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 */
cc44c765 29 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
30 cmd += 11;
31 if (*cmd == '=')
384df833 32 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
33 else {
34 puts(git_exec_path());
35 exit(0);
36 }
37 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4ab243a9 38 setup_pager();
463a849d
MM
39 } else if (!strcmp(cmd, "--no-pager")) {
40 setenv("GIT_PAGER", "cat", 1);
41 if (envchanged)
42 *envchanged = 1;
6acbcb92 43 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
44 if (*argc < 2) {
45 fprintf(stderr, "No directory given for --git-dir.\n" );
46 usage(git_usage_string);
47 }
45b09794 48 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
49 if (envchanged)
50 *envchanged = 1;
6acbcb92
JS
51 (*argv)++;
52 (*argc)--;
e4b02333 53 handled++;
cc44c765 54 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 55 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec
ML
56 if (envchanged)
57 *envchanged = 1;
892c41b9
ML
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);
4394efec
ML
64 if (envchanged)
65 *envchanged = 1;
892c41b9
ML
66 (*argv)++;
67 (*argc)--;
68 } else if (!prefixcmp(cmd, "--work-tree=")) {
69 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec
ML
70 if (envchanged)
71 *envchanged = 1;
6acbcb92 72 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 73 static char git_dir[PATH_MAX+1];
6adcca3f 74 is_bare_repository_cfg = 1;
9277d602 75 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec
ML
76 if (envchanged)
77 *envchanged = 1;
6acbcb92
JS
78 } else {
79 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 80 usage(git_usage_string);
6acbcb92 81 }
4ab243a9
JS
82
83 (*argv)++;
84 (*argc)--;
85 handled++;
86 }
87 return handled;
88}
89
2b11e317 90static const char *alias_command;
96f1e58f 91static char *alias_string;
2b11e317
JS
92
93static int git_alias_config(const char *var, const char *value)
94{
cc44c765 95 if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
9befac47 96 alias_string = xstrdup(value);
2b11e317
JS
97 }
98 return 0;
99}
100
101static int split_cmdline(char *cmdline, const char ***argv)
102{
103 int src, dst, count = 0, size = 16;
104 char quoted = 0;
105
3301521a 106 *argv = xmalloc(sizeof(char*) * size);
2b11e317
JS
107
108 /* split alias_string */
109 (*argv)[count++] = cmdline;
110 for (src = dst = 0; cmdline[src];) {
111 char c = cmdline[src];
112 if (!quoted && isspace(c)) {
113 cmdline[dst++] = 0;
114 while (cmdline[++src]
115 && isspace(cmdline[src]))
116 ; /* skip */
117 if (count >= size) {
118 size += 16;
83572c1a 119 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
120 }
121 (*argv)[count++] = cmdline + dst;
122 } else if(!quoted && (c == '\'' || c == '"')) {
123 quoted = c;
124 src++;
125 } else if (c == quoted) {
126 quoted = 0;
127 src++;
128 } else {
129 if (c == '\\' && quoted != '\'') {
130 src++;
131 c = cmdline[src];
132 if (!c) {
133 free(*argv);
134 *argv = NULL;
135 return error("cmdline ends with \\");
136 }
137 }
138 cmdline[dst++] = c;
139 src++;
140 }
141 }
142
143 cmdline[dst] = 0;
144
145 if (quoted) {
146 free(*argv);
147 *argv = NULL;
148 return error("unclosed quote");
149 }
150
151 return count;
152}
153
154static int handle_alias(int *argcp, const char ***argv)
155{
4394efec 156 int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 157 const char *subdir;
0347a8c7
ML
158 int count, option_count;
159 const char** new_argv;
2b11e317
JS
160
161 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
162
163 alias_command = (*argv)[0];
164 git_config(git_alias_config);
165 if (alias_string) {
dfd42a3c 166 if (alias_string[0] == '!') {
a2f8028d 167 if (*argcp > 1) {
7a33bcbe 168 struct strbuf buf;
a2f8028d 169
7a33bcbe
PH
170 strbuf_init(&buf, PATH_MAX);
171 strbuf_addstr(&buf, alias_string);
172 sq_quote_argv(&buf, (*argv) + 1, *argcp - 1, PATH_MAX);
a2f8028d 173 free(alias_string);
7a33bcbe 174 alias_string = buf.buf;
a2f8028d 175 }
dfd42a3c
TT
176 trace_printf("trace: alias to shell cmd: %s => %s\n",
177 alias_command, alias_string + 1);
178 ret = system(alias_string + 1);
179 if (ret >= 0 && WIFEXITED(ret) &&
180 WEXITSTATUS(ret) != 127)
181 exit(WEXITSTATUS(ret));
182 die("Failed to run '%s' when expanding alias '%s'\n",
183 alias_string + 1, alias_command);
184 }
0347a8c7 185 count = split_cmdline(alias_string, &new_argv);
4394efec
ML
186 option_count = handle_options(&new_argv, &count, &envchanged);
187 if (envchanged)
188 die("alias '%s' changes environment variables\n"
189 "You can use '!git' in the alias to do this.",
190 alias_command);
0347a8c7
ML
191 memmove(new_argv - option_count, new_argv,
192 count * sizeof(char *));
193 new_argv -= option_count;
194
195 if (count < 1)
196 die("empty alias for %s", alias_command);
197
198 if (!strcmp(alias_command, new_argv[0]))
199 die("recursive alias: %s", alias_command);
200
6ce4e61f
CC
201 trace_argv_printf(new_argv, count,
202 "trace: alias expansion: %s =>",
203 alias_command);
575ba9d6 204
83572c1a
JF
205 new_argv = xrealloc(new_argv, sizeof(char*) *
206 (count + *argcp + 1));
0347a8c7
ML
207 /* insert after command name */
208 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
209 new_argv[count+*argcp] = NULL;
2b11e317 210
0347a8c7
ML
211 *argv = new_argv;
212 *argcp += count - 1;
2b11e317 213
0347a8c7 214 ret = 1;
2b11e317
JS
215 }
216
217 if (subdir)
218 chdir(subdir);
219
47e5c0ca
JS
220 errno = saved_errno;
221
2b11e317
JS
222 return ret;
223}
224
70827b15 225const char git_version_string[] = GIT_VERSION;
5b84f4d8 226
efffea03
JH
227#define RUN_SETUP (1<<0)
228#define USE_PAGER (1<<1)
7eff28a9
SP
229/*
230 * require working tree to be present -- anything uses this needs
231 * RUN_SETUP for reading from the configuration file.
232 */
7ae3df8c 233#define NEED_WORK_TREE (1<<2)
a633fca0 234
47d0b4ff
LT
235struct cmd_struct {
236 const char *cmd;
237 int (*fn)(int, const char **, const char *);
238 int option;
239};
240
241static int run_command(struct cmd_struct *p, int argc, const char **argv)
242{
0f157315
LT
243 int status;
244 struct stat st;
47d0b4ff
LT
245 const char *prefix;
246
247 prefix = NULL;
248 if (p->option & RUN_SETUP)
249 prefix = setup_git_directory();
250 if (p->option & USE_PAGER)
251 setup_pager();
e90fdc39
JS
252 if (p->option & NEED_WORK_TREE) {
253 const char *work_tree = get_git_work_tree();
254 const char *git_dir = get_git_dir();
255 if (!is_absolute_path(git_dir))
256 set_git_dir(make_absolute_path(git_dir));
257 if (!work_tree || chdir(work_tree))
258 die("%s must be run in a work tree", p->cmd);
259 }
47d0b4ff
LT
260 trace_argv_printf(argv, argc, "trace: built-in: git");
261
0f157315
LT
262 status = p->fn(argc, argv, prefix);
263 if (status)
264 return status;
265
266 /* Somebody closed stdout? */
267 if (fstat(fileno(stdout), &st))
268 return 0;
269 /* Ignore write errors for pipes and sockets.. */
270 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
271 return 0;
272
273 /* Check for ENOSPC and EIO errors.. */
0227f988 274 if (fflush(stdout))
0f157315 275 die("write failure on standard output: %s", strerror(errno));
0227f988
LT
276 if (ferror(stdout))
277 die("unknown write failure on standard output");
278 if (fclose(stdout))
279 die("close failed on standard output: %s", strerror(errno));
0f157315 280 return 0;
47d0b4ff
LT
281}
282
283static void handle_internal_command(int argc, const char **argv)
231af832
LT
284{
285 const char *cmd = argv[0];
47d0b4ff 286 static struct cmd_struct commands[] = {
7ae3df8c 287 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
d97bc5de 288 { "annotate", cmd_annotate, RUN_SETUP },
f754fa9c 289 { "apply", cmd_apply },
265d5280 290 { "archive", cmd_archive },
4f0219a4 291 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 292 { "branch", cmd_branch, RUN_SETUP },
2e0afafe 293 { "bundle", cmd_bundle },
efffea03 294 { "cat-file", cmd_cat_file, RUN_SETUP },
4465f410
JS
295 { "checkout-index", cmd_checkout_index,
296 RUN_SETUP | NEED_WORK_TREE},
0864f264 297 { "check-ref-format", cmd_check_ref_format },
7ae3df8c 298 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
e827633a 299 { "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c 300 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
efffea03 301 { "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c 302 { "config", cmd_config },
8112894d 303 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 304 { "describe", cmd_describe, RUN_SETUP },
89d07f75 305 { "diff", cmd_diff },
d516c2d1 306 { "diff-files", cmd_diff_files },
efffea03 307 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 308 { "diff-tree", cmd_diff_tree, RUN_SETUP },
b888d61c 309 { "fetch", cmd_fetch, RUN_SETUP },
2d4177c0 310 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
d4289fff 311 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03 312 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 313 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 314 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
315 { "fsck", cmd_fsck, RUN_SETUP },
316 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 317 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 318 { "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b 319 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
f754fa9c 320 { "help", cmd_help },
30ae764b
DB
321#ifndef NO_CURL
322 { "http-fetch", cmd_http_fetch, RUN_SETUP },
323#endif
515377ea 324 { "init", cmd_init_db },
f754fa9c 325 { "init-db", cmd_init_db },
efffea03
JH
326 { "log", cmd_log, RUN_SETUP | USE_PAGER },
327 { "ls-files", cmd_ls_files, RUN_SETUP },
328 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
329 { "mailinfo", cmd_mailinfo },
330 { "mailsplit", cmd_mailsplit },
71dfbf22 331 { "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35 332 { "merge-file", cmd_merge_file },
7ae3df8c 333 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
efffea03
JH
334 { "name-rev", cmd_name_rev, RUN_SETUP },
335 { "pack-objects", cmd_pack_objects, RUN_SETUP },
d97bc5de 336 { "pickaxe", cmd_blame, RUN_SETUP },
efffea03
JH
337 { "prune", cmd_prune, RUN_SETUP },
338 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 339 { "push", cmd_push, RUN_SETUP },
efffea03 340 { "read-tree", cmd_read_tree, RUN_SETUP },
4264dc15 341 { "reflog", cmd_reflog, RUN_SETUP },
e0d10e1c 342 { "repo-config", cmd_config },
658f3650 343 { "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa 344 { "reset", cmd_reset, RUN_SETUP },
efffea03
JH
345 { "rev-list", cmd_rev_list, RUN_SETUP },
346 { "rev-parse", cmd_rev_parse, RUN_SETUP },
7ae3df8c
ML
347 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
348 { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
349 { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
1d541c12 350 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
efffea03
JH
351 { "show-branch", cmd_show_branch, RUN_SETUP },
352 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 353 { "stripspace", cmd_stripspace },
efffea03 354 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9 355 { "tag", cmd_tag, RUN_SETUP },
9cb90b80 356 { "tar-tree", cmd_tar_tree },
efffea03
JH
357 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
358 { "update-index", cmd_update_index, RUN_SETUP },
359 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 360 { "upload-archive", cmd_upload_archive },
2ae68fcb 361 { "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c 362 { "version", cmd_version },
efffea03
JH
363 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
364 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 365 { "verify-pack", cmd_verify_pack },
358ddb62 366 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 367 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
368 };
369 int i;
370
1cd95087
LT
371 /* Turn "git cmd --help" into "git help cmd" */
372 if (argc > 1 && !strcmp(argv[1], "--help")) {
373 argv[1] = argv[0];
374 argv[0] = cmd = "help";
375 }
376
231af832
LT
377 for (i = 0; i < ARRAY_SIZE(commands); i++) {
378 struct cmd_struct *p = commands+i;
379 if (strcmp(p->cmd, cmd))
380 continue;
47d0b4ff 381 exit(run_command(p, argc, argv));
231af832
LT
382 }
383}
384
47d0b4ff 385int main(int argc, const char **argv)
8e49d503 386{
5b6df8e4 387 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 388 char *slash = strrchr(cmd, '/');
511707d4 389 const char *cmd_path = NULL;
a025463b 390 int done_alias = 0;
231af832
LT
391
392 /*
393 * Take the basename of argv[0] as the command
394 * name, and the dirname as the default exec_path
43db492a 395 * if we don't have anything better.
231af832
LT
396 */
397 if (slash) {
398 *slash++ = 0;
511707d4 399 cmd_path = cmd;
231af832
LT
400 cmd = slash;
401 }
8e49d503 402
231af832
LT
403 /*
404 * "git-xxxx" is the same as "git xxxx", but we obviously:
405 *
406 * - cannot take flags in between the "git" and the "xxxx".
407 * - cannot execute it externally (since it would just do
408 * the same thing over again)
409 *
410 * So we just directly call the internal command handler, and
411 * die if that one cannot handle it.
412 */
cc44c765 413 if (!prefixcmp(cmd, "git-")) {
231af832
LT
414 cmd += 4;
415 argv[0] = cmd;
47d0b4ff 416 handle_internal_command(argc, argv);
231af832
LT
417 die("cannot handle %s internally", cmd);
418 }
8e49d503 419
231af832 420 /* Look for flags.. */
6acbcb92
JS
421 argv++;
422 argc--;
4394efec 423 handle_options(&argv, &argc, NULL);
6acbcb92 424 if (argc > 0) {
cc44c765 425 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
426 argv[0] += 2;
427 } else {
3d7e2d85
SP
428 /* The user didn't specify a command; give them help */
429 printf("usage: %s\n\n", git_usage_string);
430 list_common_cmds_help();
431 exit(1);
97fc6c5f 432 }
6acbcb92 433 cmd = argv[0];
231af832
LT
434
435 /*
511707d4
SP
436 * We use PATH to find git commands, but we prepend some higher
437 * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
438 * environment, and the $(gitexecdir) from the Makefile at build
439 * time.
231af832 440 */
511707d4 441 setup_path(cmd_path);
8e49d503 442
a025463b
JH
443 while (1) {
444 /* See if it's an internal command */
47d0b4ff 445 handle_internal_command(argc, argv);
2b11e317 446
a025463b
JH
447 /* .. then try the external ones */
448 execv_git_cmd(argv);
231af832 449
a025463b
JH
450 /* It could be an alias -- this works around the insanity
451 * of overriding "git log" with "git show" by having
452 * alias.log = show
453 */
454 if (done_alias || !handle_alias(&argc, &argv))
455 break;
456 done_alias = 1;
457 }
10b15b86 458
f3dd015c
TT
459 if (errno == ENOENT) {
460 if (done_alias) {
461 fprintf(stderr, "Expansion of alias '%s' failed; "
462 "'%s' is not a git-command\n",
463 cmd, argv[0]);
464 exit(1);
465 }
822a7d50 466 help_unknown_cmd(cmd);
f3dd015c 467 }
10b15b86
AR
468
469 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 470 cmd, strerror(errno));
8e49d503
AE
471
472 return 1;
473}