Merge branch 'maint'
[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"
d8e96fd8 5#include "run-command.h"
8e49d503 6
822a7d50 7const char git_usage_string[] =
89a56bfb 8 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
822a7d50 9
b7d96819
TL
10const char git_more_info_string[] =
11 "See 'git help COMMAND' for more information on a specific command.";
12
4e10738a
JK
13static int use_pager = -1;
14struct pager_config {
15 const char *cmd;
16 int val;
17};
18
19static int pager_command_config(const char *var, const char *value, void *data)
20{
21 struct pager_config *c = data;
22 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
23 c->val = git_config_bool(var, value);
24 return 0;
25}
26
27/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
28int check_pager_config(const char *cmd)
29{
30 struct pager_config c;
31 c.cmd = cmd;
32 c.val = -1;
33 git_config(pager_command_config, &c);
34 return c.val;
35}
36
37static void commit_pager_choice(void) {
38 switch (use_pager) {
39 case 0:
40 setenv("GIT_PAGER", "cat", 1);
41 break;
42 case 1:
43 setup_pager();
44 break;
45 default:
46 break;
47 }
48}
49
4b25d091 50static int handle_options(const char ***argv, int *argc, int *envchanged)
4ab243a9
JS
51{
52 int handled = 0;
53
54 while (*argc > 0) {
55 const char *cmd = (*argv)[0];
56 if (cmd[0] != '-')
57 break;
58
6acbcb92
JS
59 /*
60 * For legacy reasons, the "version" and "help"
61 * commands can be written with "--" prepended
62 * to make them look like flags.
63 */
64 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
65 break;
66
67 /*
68 * Check remaining flags.
69 */
cc44c765 70 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
71 cmd += 11;
72 if (*cmd == '=')
384df833 73 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
74 else {
75 puts(git_exec_path());
76 exit(0);
77 }
89a56bfb
MH
78 } else if (!strcmp(cmd, "--html-path")) {
79 puts(system_path(GIT_HTML_PATH));
80 exit(0);
6acbcb92 81 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 82 use_pager = 1;
463a849d 83 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 84 use_pager = 0;
463a849d
MM
85 if (envchanged)
86 *envchanged = 1;
6acbcb92 87 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
88 if (*argc < 2) {
89 fprintf(stderr, "No directory given for --git-dir.\n" );
90 usage(git_usage_string);
91 }
45b09794 92 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
93 if (envchanged)
94 *envchanged = 1;
6acbcb92
JS
95 (*argv)++;
96 (*argc)--;
e4b02333 97 handled++;
cc44c765 98 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 99 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec
ML
100 if (envchanged)
101 *envchanged = 1;
892c41b9
ML
102 } else if (!strcmp(cmd, "--work-tree")) {
103 if (*argc < 2) {
104 fprintf(stderr, "No directory given for --work-tree.\n" );
105 usage(git_usage_string);
106 }
107 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
108 if (envchanged)
109 *envchanged = 1;
892c41b9
ML
110 (*argv)++;
111 (*argc)--;
112 } else if (!prefixcmp(cmd, "--work-tree=")) {
113 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec
ML
114 if (envchanged)
115 *envchanged = 1;
6acbcb92 116 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 117 static char git_dir[PATH_MAX+1];
6adcca3f 118 is_bare_repository_cfg = 1;
9277d602 119 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec
ML
120 if (envchanged)
121 *envchanged = 1;
6acbcb92
JS
122 } else {
123 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 124 usage(git_usage_string);
6acbcb92 125 }
4ab243a9
JS
126
127 (*argv)++;
128 (*argc)--;
129 handled++;
130 }
131 return handled;
132}
133
2b11e317
JS
134static int handle_alias(int *argcp, const char ***argv)
135{
af05d679 136 int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 137 const char *subdir;
0347a8c7 138 int count, option_count;
4b25d091 139 const char **new_argv;
94351118
JK
140 const char *alias_command;
141 char *alias_string;
e85dc0a3 142 int unused_nongit;
2b11e317 143
e85dc0a3 144 subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
145
146 alias_command = (*argv)[0];
94351118 147 alias_string = alias_lookup(alias_command);
0347a8c7 148 if (alias_string) {
dfd42a3c 149 if (alias_string[0] == '!') {
a2f8028d 150 if (*argcp > 1) {
7a33bcbe 151 struct strbuf buf;
a2f8028d 152
7a33bcbe
PH
153 strbuf_init(&buf, PATH_MAX);
154 strbuf_addstr(&buf, alias_string);
b319ce4c 155 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
a2f8028d 156 free(alias_string);
7a33bcbe 157 alias_string = buf.buf;
a2f8028d 158 }
dfd42a3c
TT
159 trace_printf("trace: alias to shell cmd: %s => %s\n",
160 alias_command, alias_string + 1);
161 ret = system(alias_string + 1);
162 if (ret >= 0 && WIFEXITED(ret) &&
163 WEXITSTATUS(ret) != 127)
164 exit(WEXITSTATUS(ret));
d7530708 165 die("Failed to run '%s' when expanding alias '%s'",
dfd42a3c
TT
166 alias_string + 1, alias_command);
167 }
0347a8c7 168 count = split_cmdline(alias_string, &new_argv);
dc4179f9
DM
169 if (count < 0)
170 die("Bad alias.%s string", alias_command);
4394efec
ML
171 option_count = handle_options(&new_argv, &count, &envchanged);
172 if (envchanged)
173 die("alias '%s' changes environment variables\n"
174 "You can use '!git' in the alias to do this.",
175 alias_command);
0347a8c7
ML
176 memmove(new_argv - option_count, new_argv,
177 count * sizeof(char *));
178 new_argv -= option_count;
179
180 if (count < 1)
181 die("empty alias for %s", alias_command);
182
183 if (!strcmp(alias_command, new_argv[0]))
184 die("recursive alias: %s", alias_command);
185
b319ce4c 186 trace_argv_printf(new_argv,
6ce4e61f
CC
187 "trace: alias expansion: %s =>",
188 alias_command);
575ba9d6 189
4b25d091 190 new_argv = xrealloc(new_argv, sizeof(char *) *
83572c1a 191 (count + *argcp + 1));
0347a8c7 192 /* insert after command name */
4b25d091 193 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
0347a8c7 194 new_argv[count+*argcp] = NULL;
2b11e317 195
0347a8c7
ML
196 *argv = new_argv;
197 *argcp += count - 1;
2b11e317 198
0347a8c7 199 ret = 1;
2b11e317
JS
200 }
201
7be77de2
AR
202 if (subdir && chdir(subdir))
203 die("Cannot change to %s: %s", subdir, strerror(errno));
2b11e317 204
47e5c0ca
JS
205 errno = saved_errno;
206
2b11e317
JS
207 return ret;
208}
209
70827b15 210const char git_version_string[] = GIT_VERSION;
5b84f4d8 211
efffea03
JH
212#define RUN_SETUP (1<<0)
213#define USE_PAGER (1<<1)
7eff28a9
SP
214/*
215 * require working tree to be present -- anything uses this needs
216 * RUN_SETUP for reading from the configuration file.
217 */
7ae3df8c 218#define NEED_WORK_TREE (1<<2)
a633fca0 219
47d0b4ff
LT
220struct cmd_struct {
221 const char *cmd;
222 int (*fn)(int, const char **, const char *);
223 int option;
224};
225
f172f334 226static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
47d0b4ff 227{
0f157315
LT
228 int status;
229 struct stat st;
47d0b4ff
LT
230 const char *prefix;
231
232 prefix = NULL;
233 if (p->option & RUN_SETUP)
234 prefix = setup_git_directory();
4e10738a
JK
235
236 if (use_pager == -1 && p->option & RUN_SETUP)
237 use_pager = check_pager_config(p->cmd);
238 if (use_pager == -1 && p->option & USE_PAGER)
239 use_pager = 1;
240 commit_pager_choice();
241
59f0f2f3
MH
242 if (p->option & NEED_WORK_TREE)
243 setup_work_tree();
244
b319ce4c 245 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 246
0f157315
LT
247 status = p->fn(argc, argv, prefix);
248 if (status)
2488df84 249 return status & 0xff;
0f157315
LT
250
251 /* Somebody closed stdout? */
252 if (fstat(fileno(stdout), &st))
253 return 0;
254 /* Ignore write errors for pipes and sockets.. */
255 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
256 return 0;
257
258 /* Check for ENOSPC and EIO errors.. */
0227f988 259 if (fflush(stdout))
0f157315 260 die("write failure on standard output: %s", strerror(errno));
0227f988
LT
261 if (ferror(stdout))
262 die("unknown write failure on standard output");
263 if (fclose(stdout))
264 die("close failed on standard output: %s", strerror(errno));
0f157315 265 return 0;
47d0b4ff
LT
266}
267
268static void handle_internal_command(int argc, const char **argv)
231af832
LT
269{
270 const char *cmd = argv[0];
47d0b4ff 271 static struct cmd_struct commands[] = {
7ae3df8c 272 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
11920d28 273 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
d97bc5de 274 { "annotate", cmd_annotate, RUN_SETUP },
f754fa9c 275 { "apply", cmd_apply },
265d5280 276 { "archive", cmd_archive },
1bf072e3 277 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
4f0219a4 278 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 279 { "branch", cmd_branch, RUN_SETUP },
2e0afafe 280 { "bundle", cmd_bundle },
efffea03 281 { "cat-file", cmd_cat_file, RUN_SETUP },
782c2d65 282 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
4465f410
JS
283 { "checkout-index", cmd_checkout_index,
284 RUN_SETUP | NEED_WORK_TREE},
0864f264 285 { "check-ref-format", cmd_check_ref_format },
2d35d556 286 { "check-attr", cmd_check_attr, RUN_SETUP },
e827633a 287 { "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c 288 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
8434c2f1 289 { "clone", cmd_clone },
113f10f2 290 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
f5bbc322 291 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
efffea03 292 { "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c 293 { "config", cmd_config },
8112894d 294 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 295 { "describe", cmd_describe, RUN_SETUP },
89d07f75 296 { "diff", cmd_diff },
4f38f6b5 297 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
efffea03 298 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 299 { "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e 300 { "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c 301 { "fetch", cmd_fetch, RUN_SETUP },
2d4177c0 302 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
d4289fff 303 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03 304 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 305 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 306 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
307 { "fsck", cmd_fsck, RUN_SETUP },
308 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 309 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 310 { "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b 311 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
f754fa9c 312 { "help", cmd_help },
30ae764b
DB
313#ifndef NO_CURL
314 { "http-fetch", cmd_http_fetch, RUN_SETUP },
315#endif
515377ea 316 { "init", cmd_init_db },
f754fa9c 317 { "init-db", cmd_init_db },
efffea03
JH
318 { "log", cmd_log, RUN_SETUP | USE_PAGER },
319 { "ls-files", cmd_ls_files, RUN_SETUP },
320 { "ls-tree", cmd_ls_tree, RUN_SETUP },
8951d7c1 321 { "ls-remote", cmd_ls_remote },
f754fa9c
JH
322 { "mailinfo", cmd_mailinfo },
323 { "mailsplit", cmd_mailsplit },
1c7b76be 324 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
71dfbf22 325 { "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35 326 { "merge-file", cmd_merge_file },
a00a42ae 327 { "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca 328 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
1736855c 329 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
7ae3df8c 330 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
efffea03
JH
331 { "name-rev", cmd_name_rev, RUN_SETUP },
332 { "pack-objects", cmd_pack_objects, RUN_SETUP },
8951d7c1 333 { "peek-remote", cmd_ls_remote },
d97bc5de 334 { "pickaxe", cmd_blame, RUN_SETUP },
efffea03
JH
335 { "prune", cmd_prune, RUN_SETUP },
336 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 337 { "push", cmd_push, RUN_SETUP },
efffea03 338 { "read-tree", cmd_read_tree, RUN_SETUP },
be5908ae 339 { "receive-pack", cmd_receive_pack },
4264dc15 340 { "reflog", cmd_reflog, RUN_SETUP },
211c8968 341 { "remote", cmd_remote, RUN_SETUP },
e0d10e1c 342 { "repo-config", cmd_config },
658f3650 343 { "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa 344 { "reset", cmd_reset, RUN_SETUP },
efffea03 345 { "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a 346 { "rev-parse", cmd_rev_parse },
7ae3df8c 347 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
271bb087 348 { "rm", cmd_rm, RUN_SETUP },
96249c04 349 { "send-pack", cmd_send_pack, RUN_SETUP },
abe549e1 350 { "shortlog", cmd_shortlog, USE_PAGER },
efffea03
JH
351 { "show-branch", cmd_show_branch, RUN_SETUP },
352 { "show", cmd_show, RUN_SETUP | USE_PAGER },
10762323 353 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
f754fa9c 354 { "stripspace", cmd_stripspace },
efffea03 355 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9 356 { "tag", cmd_tag, RUN_SETUP },
9cb90b80 357 { "tar-tree", cmd_tar_tree },
efffea03
JH
358 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
359 { "update-index", cmd_update_index, RUN_SETUP },
360 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 361 { "upload-archive", cmd_upload_archive },
2ae68fcb 362 { "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c 363 { "version", cmd_version },
efffea03
JH
364 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
365 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 366 { "verify-pack", cmd_verify_pack },
358ddb62 367 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 368 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
369 };
370 int i;
23326d14
JS
371 static const char ext[] = STRIP_EXTENSION;
372
373 if (sizeof(ext) > 1) {
374 i = strlen(argv[0]) - strlen(ext);
375 if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d 376 char *argv0 = xstrdup(argv[0]);
23326d14
JS
377 argv[0] = cmd = argv0;
378 argv0[i] = '\0';
379 }
380 }
231af832 381
1cd95087
LT
382 /* Turn "git cmd --help" into "git help cmd" */
383 if (argc > 1 && !strcmp(argv[1], "--help")) {
384 argv[1] = argv[0];
385 argv[0] = cmd = "help";
386 }
387
231af832
LT
388 for (i = 0; i < ARRAY_SIZE(commands); i++) {
389 struct cmd_struct *p = commands+i;
390 if (strcmp(p->cmd, cmd))
391 continue;
f172f334 392 exit(run_builtin(p, argc, argv));
231af832
LT
393 }
394}
395
7550be0a
JH
396static void execv_dashed_external(const char **argv)
397{
f285a2d7 398 struct strbuf cmd = STRBUF_INIT;
7550be0a 399 const char *tmp;
d8e96fd8 400 int status;
7550be0a 401
7550be0a
JH
402 strbuf_addf(&cmd, "git-%s", argv[0]);
403
404 /*
405 * argv[0] must be the git command, but the argv array
406 * belongs to the caller, and may be reused in
407 * subsequent loop iterations. Save argv[0] and
408 * restore it on error.
409 */
410 tmp = argv[0];
411 argv[0] = cmd.buf;
412
413 trace_argv_printf(argv, "trace: exec:");
414
d8e96fd8
JK
415 /*
416 * if we fail because the command is not found, it is
417 * OK to return. Otherwise, we just pass along the status code.
418 */
419 status = run_command_v_opt(argv, 0);
420 if (status != -ERR_RUN_COMMAND_EXEC) {
421 if (IS_RUN_COMMAND_ERR(status))
422 die("unable to run '%s'", argv[0]);
423 exit(-status);
424 }
425 errno = ENOENT; /* as if we called execvp */
7550be0a
JH
426
427 argv[0] = tmp;
428
429 strbuf_release(&cmd);
430}
431
a907e1b6
AS
432static int run_argv(int *argcp, const char ***argv)
433{
434 int done_alias = 0;
435
436 while (1) {
437 /* See if it's an internal command */
438 handle_internal_command(*argcp, *argv);
439
440 /* .. then try the external ones */
441 execv_dashed_external(*argv);
442
443 /* It could be an alias -- this works around the insanity
444 * of overriding "git log" with "git show" by having
445 * alias.log = show
446 */
447 if (done_alias || !handle_alias(argcp, argv))
448 break;
449 done_alias = 1;
450 }
451
452 return done_alias;
453}
454
7550be0a 455
47d0b4ff 456int main(int argc, const char **argv)
8e49d503 457{
4dd47c3b 458 const char *cmd;
231af832 459
2cd72b0b
SP
460 cmd = git_extract_argv0_path(argv[0]);
461 if (!cmd)
4dd47c3b 462 cmd = "git-help";
8e49d503 463
231af832
LT
464 /*
465 * "git-xxxx" is the same as "git xxxx", but we obviously:
466 *
467 * - cannot take flags in between the "git" and the "xxxx".
468 * - cannot execute it externally (since it would just do
469 * the same thing over again)
470 *
471 * So we just directly call the internal command handler, and
472 * die if that one cannot handle it.
473 */
cc44c765 474 if (!prefixcmp(cmd, "git-")) {
231af832
LT
475 cmd += 4;
476 argv[0] = cmd;
47d0b4ff 477 handle_internal_command(argc, argv);
231af832
LT
478 die("cannot handle %s internally", cmd);
479 }
8e49d503 480
231af832 481 /* Look for flags.. */
6acbcb92
JS
482 argv++;
483 argc--;
4394efec 484 handle_options(&argv, &argc, NULL);
4e10738a 485 commit_pager_choice();
6acbcb92 486 if (argc > 0) {
cc44c765 487 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
488 argv[0] += 2;
489 } else {
3d7e2d85
SP
490 /* The user didn't specify a command; give them help */
491 printf("usage: %s\n\n", git_usage_string);
492 list_common_cmds_help();
b7d96819 493 printf("\n%s\n", git_more_info_string);
3d7e2d85 494 exit(1);
97fc6c5f 495 }
6acbcb92 496 cmd = argv[0];
231af832
LT
497
498 /*
511707d4 499 * We use PATH to find git commands, but we prepend some higher
3ea3c215 500 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4
SP
501 * environment, and the $(gitexecdir) from the Makefile at build
502 * time.
231af832 503 */
e1464ca7 504 setup_path();
8e49d503 505
a025463b 506 while (1) {
a907e1b6
AS
507 static int done_help = 0;
508 static int was_alias = 0;
509 was_alias = run_argv(&argc, &argv);
510 if (errno != ENOENT)
a025463b 511 break;
a907e1b6 512 if (was_alias) {
f3dd015c
TT
513 fprintf(stderr, "Expansion of alias '%s' failed; "
514 "'%s' is not a git-command\n",
515 cmd, argv[0]);
516 exit(1);
517 }
a907e1b6
AS
518 if (!done_help) {
519 cmd = argv[0] = help_unknown_cmd(cmd);
520 done_help = 1;
521 } else
522 break;
f3dd015c 523 }
10b15b86
AR
524
525 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 526 cmd, strerror(errno));
8e49d503
AE
527
528 return 1;
529}