git --bare cmd: do not unconditionally nuke GIT_DIR
[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
8e49d503
AE
9static void prepend_to_path(const char *dir, int len)
10{
554fe20d
TH
11 const char *old_path = getenv("PATH");
12 char *path;
8e49d503
AE
13 int path_len = len;
14
15 if (!old_path)
7dbc2c04 16 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
17
18 path_len = len + strlen(old_path) + 1;
19
2d7320d0 20 path = xmalloc(path_len + 1);
8e49d503
AE
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);
0caea90b
CC
27
28 free(path);
8e49d503
AE
29}
30
4394efec 31static int handle_options(const char*** argv, int* argc, int* envchanged)
4ab243a9
JS
32{
33 int handled = 0;
34
35 while (*argc > 0) {
36 const char *cmd = (*argv)[0];
37 if (cmd[0] != '-')
38 break;
39
6acbcb92
JS
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 */
cc44c765 51 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
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")) {
4ab243a9 60 setup_pager();
463a849d
MM
61 } else if (!strcmp(cmd, "--no-pager")) {
62 setenv("GIT_PAGER", "cat", 1);
63 if (envchanged)
64 *envchanged = 1;
6acbcb92 65 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
66 if (*argc < 2) {
67 fprintf(stderr, "No directory given for --git-dir.\n" );
68 usage(git_usage_string);
69 }
45b09794 70 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
71 if (envchanged)
72 *envchanged = 1;
6acbcb92
JS
73 (*argv)++;
74 (*argc)--;
e4b02333 75 handled++;
cc44c765 76 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 77 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec
ML
78 if (envchanged)
79 *envchanged = 1;
892c41b9
ML
80 } else if (!strcmp(cmd, "--work-tree")) {
81 if (*argc < 2) {
82 fprintf(stderr, "No directory given for --work-tree.\n" );
83 usage(git_usage_string);
84 }
85 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
86 if (envchanged)
87 *envchanged = 1;
892c41b9
ML
88 (*argv)++;
89 (*argc)--;
90 } else if (!prefixcmp(cmd, "--work-tree=")) {
91 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec
ML
92 if (envchanged)
93 *envchanged = 1;
6acbcb92 94 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 95 static char git_dir[PATH_MAX+1];
6adcca3f 96 is_bare_repository_cfg = 1;
9277d602 97 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec
ML
98 if (envchanged)
99 *envchanged = 1;
6acbcb92
JS
100 } else {
101 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 102 usage(git_usage_string);
6acbcb92 103 }
4ab243a9
JS
104
105 (*argv)++;
106 (*argc)--;
107 handled++;
108 }
109 return handled;
110}
111
2b11e317 112static const char *alias_command;
96f1e58f 113static char *alias_string;
2b11e317
JS
114
115static int git_alias_config(const char *var, const char *value)
116{
cc44c765 117 if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
9befac47 118 alias_string = xstrdup(value);
2b11e317
JS
119 }
120 return 0;
121}
122
123static int split_cmdline(char *cmdline, const char ***argv)
124{
125 int src, dst, count = 0, size = 16;
126 char quoted = 0;
127
3301521a 128 *argv = xmalloc(sizeof(char*) * size);
2b11e317
JS
129
130 /* split alias_string */
131 (*argv)[count++] = cmdline;
132 for (src = dst = 0; cmdline[src];) {
133 char c = cmdline[src];
134 if (!quoted && isspace(c)) {
135 cmdline[dst++] = 0;
136 while (cmdline[++src]
137 && isspace(cmdline[src]))
138 ; /* skip */
139 if (count >= size) {
140 size += 16;
83572c1a 141 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
142 }
143 (*argv)[count++] = cmdline + dst;
144 } else if(!quoted && (c == '\'' || c == '"')) {
145 quoted = c;
146 src++;
147 } else if (c == quoted) {
148 quoted = 0;
149 src++;
150 } else {
151 if (c == '\\' && quoted != '\'') {
152 src++;
153 c = cmdline[src];
154 if (!c) {
155 free(*argv);
156 *argv = NULL;
157 return error("cmdline ends with \\");
158 }
159 }
160 cmdline[dst++] = c;
161 src++;
162 }
163 }
164
165 cmdline[dst] = 0;
166
167 if (quoted) {
168 free(*argv);
169 *argv = NULL;
170 return error("unclosed quote");
171 }
172
173 return count;
174}
175
176static int handle_alias(int *argcp, const char ***argv)
177{
4394efec 178 int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 179 const char *subdir;
0347a8c7
ML
180 int count, option_count;
181 const char** new_argv;
2b11e317
JS
182
183 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
184
185 alias_command = (*argv)[0];
186 git_config(git_alias_config);
187 if (alias_string) {
dfd42a3c 188 if (alias_string[0] == '!') {
a2f8028d
JS
189 if (*argcp > 1) {
190 int i, sz = PATH_MAX;
191 char *s = xmalloc(sz), *new_alias = s;
192
193 add_to_string(&s, &sz, alias_string, 0);
194 free(alias_string);
195 alias_string = new_alias;
196 for (i = 1; i < *argcp &&
197 !add_to_string(&s, &sz, " ", 0) &&
198 !add_to_string(&s, &sz, (*argv)[i], 1)
199 ; i++)
200 ; /* do nothing */
201 if (!sz)
202 die("Too many or long arguments");
203 }
dfd42a3c
TT
204 trace_printf("trace: alias to shell cmd: %s => %s\n",
205 alias_command, alias_string + 1);
206 ret = system(alias_string + 1);
207 if (ret >= 0 && WIFEXITED(ret) &&
208 WEXITSTATUS(ret) != 127)
209 exit(WEXITSTATUS(ret));
210 die("Failed to run '%s' when expanding alias '%s'\n",
211 alias_string + 1, alias_command);
212 }
0347a8c7 213 count = split_cmdline(alias_string, &new_argv);
4394efec
ML
214 option_count = handle_options(&new_argv, &count, &envchanged);
215 if (envchanged)
216 die("alias '%s' changes environment variables\n"
217 "You can use '!git' in the alias to do this.",
218 alias_command);
0347a8c7
ML
219 memmove(new_argv - option_count, new_argv,
220 count * sizeof(char *));
221 new_argv -= option_count;
222
223 if (count < 1)
224 die("empty alias for %s", alias_command);
225
226 if (!strcmp(alias_command, new_argv[0]))
227 die("recursive alias: %s", alias_command);
228
6ce4e61f
CC
229 trace_argv_printf(new_argv, count,
230 "trace: alias expansion: %s =>",
231 alias_command);
575ba9d6 232
83572c1a
JF
233 new_argv = xrealloc(new_argv, sizeof(char*) *
234 (count + *argcp + 1));
0347a8c7
ML
235 /* insert after command name */
236 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
237 new_argv[count+*argcp] = NULL;
2b11e317 238
0347a8c7
ML
239 *argv = new_argv;
240 *argcp += count - 1;
2b11e317 241
0347a8c7 242 ret = 1;
2b11e317
JS
243 }
244
245 if (subdir)
246 chdir(subdir);
247
47e5c0ca
JS
248 errno = saved_errno;
249
2b11e317
JS
250 return ret;
251}
252
70827b15 253const char git_version_string[] = GIT_VERSION;
5b84f4d8 254
efffea03
JH
255#define RUN_SETUP (1<<0)
256#define USE_PAGER (1<<1)
7eff28a9
SP
257/*
258 * require working tree to be present -- anything uses this needs
259 * RUN_SETUP for reading from the configuration file.
260 */
7ae3df8c 261#define NEED_WORK_TREE (1<<2)
a633fca0 262
47d0b4ff
LT
263struct cmd_struct {
264 const char *cmd;
265 int (*fn)(int, const char **, const char *);
266 int option;
267};
268
269static int run_command(struct cmd_struct *p, int argc, const char **argv)
270{
0f157315
LT
271 int status;
272 struct stat st;
47d0b4ff
LT
273 const char *prefix;
274
275 prefix = NULL;
276 if (p->option & RUN_SETUP)
277 prefix = setup_git_directory();
278 if (p->option & USE_PAGER)
279 setup_pager();
e90fdc39
JS
280 if (p->option & NEED_WORK_TREE) {
281 const char *work_tree = get_git_work_tree();
282 const char *git_dir = get_git_dir();
283 if (!is_absolute_path(git_dir))
284 set_git_dir(make_absolute_path(git_dir));
285 if (!work_tree || chdir(work_tree))
286 die("%s must be run in a work tree", p->cmd);
287 }
47d0b4ff
LT
288 trace_argv_printf(argv, argc, "trace: built-in: git");
289
0f157315
LT
290 status = p->fn(argc, argv, prefix);
291 if (status)
292 return status;
293
294 /* Somebody closed stdout? */
295 if (fstat(fileno(stdout), &st))
296 return 0;
297 /* Ignore write errors for pipes and sockets.. */
298 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
299 return 0;
300
301 /* Check for ENOSPC and EIO errors.. */
0227f988 302 if (fflush(stdout))
0f157315 303 die("write failure on standard output: %s", strerror(errno));
0227f988
LT
304 if (ferror(stdout))
305 die("unknown write failure on standard output");
306 if (fclose(stdout))
307 die("close failed on standard output: %s", strerror(errno));
0f157315 308 return 0;
47d0b4ff
LT
309}
310
311static void handle_internal_command(int argc, const char **argv)
231af832
LT
312{
313 const char *cmd = argv[0];
47d0b4ff 314 static struct cmd_struct commands[] = {
7ae3df8c 315 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
d97bc5de 316 { "annotate", cmd_annotate, RUN_SETUP },
f754fa9c 317 { "apply", cmd_apply },
265d5280 318 { "archive", cmd_archive },
4f0219a4 319 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 320 { "branch", cmd_branch, RUN_SETUP },
2e0afafe 321 { "bundle", cmd_bundle },
efffea03 322 { "cat-file", cmd_cat_file, RUN_SETUP },
4465f410
JS
323 { "checkout-index", cmd_checkout_index,
324 RUN_SETUP | NEED_WORK_TREE},
0864f264 325 { "check-ref-format", cmd_check_ref_format },
7ae3df8c 326 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
e827633a 327 { "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c 328 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
efffea03 329 { "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c 330 { "config", cmd_config },
8112894d 331 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 332 { "describe", cmd_describe, RUN_SETUP },
89d07f75 333 { "diff", cmd_diff },
d516c2d1 334 { "diff-files", cmd_diff_files },
efffea03 335 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 336 { "diff-tree", cmd_diff_tree, RUN_SETUP },
d4289fff 337 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03 338 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 339 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 340 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
341 { "fsck", cmd_fsck, RUN_SETUP },
342 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 343 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 344 { "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b 345 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
f754fa9c 346 { "help", cmd_help },
515377ea 347 { "init", cmd_init_db },
f754fa9c 348 { "init-db", cmd_init_db },
efffea03
JH
349 { "log", cmd_log, RUN_SETUP | USE_PAGER },
350 { "ls-files", cmd_ls_files, RUN_SETUP },
351 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
352 { "mailinfo", cmd_mailinfo },
353 { "mailsplit", cmd_mailsplit },
71dfbf22 354 { "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35 355 { "merge-file", cmd_merge_file },
7ae3df8c 356 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
efffea03
JH
357 { "name-rev", cmd_name_rev, RUN_SETUP },
358 { "pack-objects", cmd_pack_objects, RUN_SETUP },
d97bc5de 359 { "pickaxe", cmd_blame, RUN_SETUP },
efffea03
JH
360 { "prune", cmd_prune, RUN_SETUP },
361 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 362 { "push", cmd_push, RUN_SETUP },
efffea03 363 { "read-tree", cmd_read_tree, RUN_SETUP },
4264dc15 364 { "reflog", cmd_reflog, RUN_SETUP },
e0d10e1c 365 { "repo-config", cmd_config },
658f3650 366 { "rerere", cmd_rerere, RUN_SETUP },
efffea03
JH
367 { "rev-list", cmd_rev_list, RUN_SETUP },
368 { "rev-parse", cmd_rev_parse, RUN_SETUP },
7ae3df8c
ML
369 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
370 { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
371 { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
1d541c12 372 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
efffea03
JH
373 { "show-branch", cmd_show_branch, RUN_SETUP },
374 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 375 { "stripspace", cmd_stripspace },
efffea03 376 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9 377 { "tag", cmd_tag, RUN_SETUP },
9cb90b80 378 { "tar-tree", cmd_tar_tree },
efffea03
JH
379 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
380 { "update-index", cmd_update_index, RUN_SETUP },
381 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 382 { "upload-archive", cmd_upload_archive },
2ae68fcb 383 { "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c 384 { "version", cmd_version },
efffea03
JH
385 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
386 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 387 { "verify-pack", cmd_verify_pack },
358ddb62 388 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 389 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
390 };
391 int i;
392
1cd95087
LT
393 /* Turn "git cmd --help" into "git help cmd" */
394 if (argc > 1 && !strcmp(argv[1], "--help")) {
395 argv[1] = argv[0];
396 argv[0] = cmd = "help";
397 }
398
231af832
LT
399 for (i = 0; i < ARRAY_SIZE(commands); i++) {
400 struct cmd_struct *p = commands+i;
401 if (strcmp(p->cmd, cmd))
402 continue;
47d0b4ff 403 exit(run_command(p, argc, argv));
231af832
LT
404 }
405}
406
47d0b4ff 407int main(int argc, const char **argv)
8e49d503 408{
5b6df8e4 409 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 410 char *slash = strrchr(cmd, '/');
231af832 411 const char *exec_path = NULL;
a025463b 412 int done_alias = 0;
231af832
LT
413
414 /*
415 * Take the basename of argv[0] as the command
416 * name, and the dirname as the default exec_path
417 * if it's an absolute path and we don't have
418 * anything better.
419 */
420 if (slash) {
421 *slash++ = 0;
422 if (*cmd == '/')
423 exec_path = cmd;
424 cmd = slash;
425 }
8e49d503 426
231af832
LT
427 /*
428 * "git-xxxx" is the same as "git xxxx", but we obviously:
429 *
430 * - cannot take flags in between the "git" and the "xxxx".
431 * - cannot execute it externally (since it would just do
432 * the same thing over again)
433 *
434 * So we just directly call the internal command handler, and
435 * die if that one cannot handle it.
436 */
cc44c765 437 if (!prefixcmp(cmd, "git-")) {
231af832
LT
438 cmd += 4;
439 argv[0] = cmd;
47d0b4ff 440 handle_internal_command(argc, argv);
231af832
LT
441 die("cannot handle %s internally", cmd);
442 }
8e49d503 443
231af832 444 /* Look for flags.. */
6acbcb92
JS
445 argv++;
446 argc--;
4394efec 447 handle_options(&argv, &argc, NULL);
6acbcb92 448 if (argc > 0) {
cc44c765 449 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
450 argv[0] += 2;
451 } else {
452 /* Default command: "help" */
453 argv[0] = "help";
454 argc = 1;
97fc6c5f 455 }
6acbcb92 456 cmd = argv[0];
231af832
LT
457
458 /*
cf32190a
JH
459 * We execute external git command via execv_git_cmd(),
460 * which looks at "--exec-path" option, GIT_EXEC_PATH
461 * environment, and $(gitexecdir) in Makefile while built,
462 * in this order. For scripted commands, we prepend
463 * the value of the exec_path variable to the PATH.
231af832
LT
464 */
465 if (exec_path)
466 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
467 exec_path = git_exec_path();
468 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 469
a025463b
JH
470 while (1) {
471 /* See if it's an internal command */
47d0b4ff 472 handle_internal_command(argc, argv);
2b11e317 473
a025463b
JH
474 /* .. then try the external ones */
475 execv_git_cmd(argv);
231af832 476
a025463b
JH
477 /* It could be an alias -- this works around the insanity
478 * of overriding "git log" with "git show" by having
479 * alias.log = show
480 */
481 if (done_alias || !handle_alias(&argc, &argv))
482 break;
483 done_alias = 1;
484 }
10b15b86 485
f3dd015c
TT
486 if (errno == ENOENT) {
487 if (done_alias) {
488 fprintf(stderr, "Expansion of alias '%s' failed; "
489 "'%s' is not a git-command\n",
490 cmd, argv[0]);
491 exit(1);
492 }
822a7d50 493 help_unknown_cmd(cmd);
f3dd015c 494 }
10b15b86
AR
495
496 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 497 cmd, strerror(errno));
8e49d503
AE
498
499 return 1;
500}