Git 2.3
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
fd5c363d
TF
2#include "exec_cmd.h"
3#include "help.h"
d8e96fd8 4#include "run-command.h"
8e49d503 5
822a7d50 6const char git_usage_string[] =
44e1e4d6 7 "git [--version] [--help] [-C <path>] [-c name=value]\n"
03a0fb0c 8 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
a1bea2c1
JT
9 " [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
10 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
62b4698e 11 " <command> [<args>]";
822a7d50 12
b7d96819 13const char git_more_info_string[] =
ad5fe377 14 N_("'git help -a' and 'git help -g' list available subcommands and some\n"
73903d0b
PO
15 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
16 "to read about a specific subcommand or concept.");
b7d96819 17
e37c1329 18static struct startup_info git_startup_info;
4e10738a 19static int use_pager = -1;
f655651e 20static char *orig_cwd;
c0562611
NTND
21static const char *env_names[] = {
22 GIT_DIR_ENVIRONMENT,
23 GIT_WORK_TREE_ENVIRONMENT,
24 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
25 GIT_PREFIX_ENVIRONMENT
26};
27static char *orig_env[4];
28static int saved_environment;
29
30static void save_env(void)
31{
32 int i;
33 if (saved_environment)
34 return;
35 saved_environment = 1;
f655651e 36 orig_cwd = xgetcwd();
c0562611
NTND
37 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
38 orig_env[i] = getenv(env_names[i]);
39 if (orig_env[i])
40 orig_env[i] = xstrdup(orig_env[i]);
41 }
42}
43
44static void restore_env(void)
45{
46 int i;
f655651e 47 if (orig_cwd && chdir(orig_cwd))
c0562611 48 die_errno("could not move to %s", orig_cwd);
f655651e 49 free(orig_cwd);
c0562611
NTND
50 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
51 if (orig_env[i])
52 setenv(env_names[i], orig_env[i], 1);
53 else
54 unsetenv(env_names[i]);
55 }
56}
4e10738a
JK
57
58static void commit_pager_choice(void) {
59 switch (use_pager) {
60 case 0:
61 setenv("GIT_PAGER", "cat", 1);
62 break;
63 case 1:
64 setup_pager();
65 break;
66 default:
67 break;
68 }
69}
70
4b25d091 71static int handle_options(const char ***argv, int *argc, int *envchanged)
4ab243a9 72{
73546c08 73 const char **orig_argv = *argv;
4ab243a9
JS
74
75 while (*argc > 0) {
76 const char *cmd = (*argv)[0];
77 if (cmd[0] != '-')
78 break;
79
6acbcb92
JS
80 /*
81 * For legacy reasons, the "version" and "help"
82 * commands can be written with "--" prepended
83 * to make them look like flags.
84 */
85 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
86 break;
87
88 /*
89 * Check remaining flags.
90 */
ae021d87 91 if (skip_prefix(cmd, "--exec-path", &cmd)) {
6acbcb92 92 if (*cmd == '=')
384df833 93 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
94 else {
95 puts(git_exec_path());
96 exit(0);
97 }
89a56bfb
MH
98 } else if (!strcmp(cmd, "--html-path")) {
99 puts(system_path(GIT_HTML_PATH));
100 exit(0);
f2dd8c37
JS
101 } else if (!strcmp(cmd, "--man-path")) {
102 puts(system_path(GIT_MAN_PATH));
103 exit(0);
104 } else if (!strcmp(cmd, "--info-path")) {
105 puts(system_path(GIT_INFO_PATH));
106 exit(0);
6acbcb92 107 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 108 use_pager = 1;
463a849d 109 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 110 use_pager = 0;
463a849d
MM
111 if (envchanged)
112 *envchanged = 1;
b0fa7ab5 113 } else if (!strcmp(cmd, "--no-replace-objects")) {
afc711b8 114 check_replace_refs = 0;
6476b38b
CC
115 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
116 if (envchanged)
117 *envchanged = 1;
6acbcb92 118 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
119 if (*argc < 2) {
120 fprintf(stderr, "No directory given for --git-dir.\n" );
121 usage(git_usage_string);
122 }
45b09794 123 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
124 if (envchanged)
125 *envchanged = 1;
6acbcb92
JS
126 (*argv)++;
127 (*argc)--;
ae021d87
JK
128 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
129 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
4394efec
ML
130 if (envchanged)
131 *envchanged = 1;
a1bea2c1
JT
132 } else if (!strcmp(cmd, "--namespace")) {
133 if (*argc < 2) {
134 fprintf(stderr, "No namespace given for --namespace.\n" );
135 usage(git_usage_string);
136 }
137 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
138 if (envchanged)
139 *envchanged = 1;
140 (*argv)++;
141 (*argc)--;
ae021d87
JK
142 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
143 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
a1bea2c1
JT
144 if (envchanged)
145 *envchanged = 1;
892c41b9
ML
146 } else if (!strcmp(cmd, "--work-tree")) {
147 if (*argc < 2) {
148 fprintf(stderr, "No directory given for --work-tree.\n" );
149 usage(git_usage_string);
150 }
151 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
152 if (envchanged)
153 *envchanged = 1;
892c41b9
ML
154 (*argv)++;
155 (*argc)--;
ae021d87
JK
156 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
157 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
4394efec
ML
158 if (envchanged)
159 *envchanged = 1;
6acbcb92 160 } else if (!strcmp(cmd, "--bare")) {
4d3ab44d 161 char *cwd = xgetcwd();
6adcca3f 162 is_bare_repository_cfg = 1;
4d3ab44d
RS
163 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
164 free(cwd);
2cd83d10 165 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
4394efec
ML
166 if (envchanged)
167 *envchanged = 1;
8b1fa778
AR
168 } else if (!strcmp(cmd, "-c")) {
169 if (*argc < 2) {
170 fprintf(stderr, "-c expects a configuration string\n" );
171 usage(git_usage_string);
172 }
2b64fc89 173 git_config_push_parameter((*argv)[1]);
8b1fa778
AR
174 (*argv)++;
175 (*argc)--;
823ab40f
JK
176 } else if (!strcmp(cmd, "--literal-pathspecs")) {
177 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
178 if (envchanged)
179 *envchanged = 1;
180 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
181 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
182 if (envchanged)
183 *envchanged = 1;
bd30c2e4
NTND
184 } else if (!strcmp(cmd, "--glob-pathspecs")) {
185 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
186 if (envchanged)
187 *envchanged = 1;
188 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
189 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
190 if (envchanged)
191 *envchanged = 1;
93d93537
NTND
192 } else if (!strcmp(cmd, "--icase-pathspecs")) {
193 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
194 if (envchanged)
195 *envchanged = 1;
6035d6aa
NTND
196 } else if (!strcmp(cmd, "--shallow-file")) {
197 (*argv)++;
198 (*argc)--;
069c0532 199 set_alternate_shallow_file((*argv)[0], 1);
6035d6aa
NTND
200 if (envchanged)
201 *envchanged = 1;
44e1e4d6
NR
202 } else if (!strcmp(cmd, "-C")) {
203 if (*argc < 2) {
204 fprintf(stderr, "No directory given for -C.\n" );
205 usage(git_usage_string);
206 }
207 if (chdir((*argv)[1]))
208 die_errno("Cannot change to '%s'", (*argv)[1]);
209 if (envchanged)
210 *envchanged = 1;
211 (*argv)++;
212 (*argc)--;
6acbcb92
JS
213 } else {
214 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 215 usage(git_usage_string);
6acbcb92 216 }
4ab243a9
JS
217
218 (*argv)++;
219 (*argc)--;
4ab243a9 220 }
73546c08 221 return (*argv) - orig_argv;
4ab243a9
JS
222}
223
2b11e317
JS
224static int handle_alias(int *argcp, const char ***argv)
225{
af05d679 226 int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 227 const char *subdir;
0347a8c7 228 int count, option_count;
4b25d091 229 const char **new_argv;
94351118
JK
230 const char *alias_command;
231 char *alias_string;
e85dc0a3 232 int unused_nongit;
2b11e317 233
e85dc0a3 234 subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
235
236 alias_command = (*argv)[0];
94351118 237 alias_string = alias_lookup(alias_command);
0347a8c7 238 if (alias_string) {
dfd42a3c 239 if (alias_string[0] == '!') {
7f51f8bc
EFL
240 const char **alias_argv;
241 int argc = *argcp, i;
242
030149a4 243 commit_pager_choice();
7f51f8bc
EFL
244
245 /* build alias_argv */
246 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
247 alias_argv[0] = alias_string + 1;
248 for (i = 1; i < argc; ++i)
249 alias_argv[i] = (*argv)[i];
250 alias_argv[argc] = NULL;
251
26b05251 252 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
7f51f8bc
EFL
253 if (ret >= 0) /* normal exit */
254 exit(ret);
255
256 die_errno("While expanding alias '%s': '%s'",
257 alias_command, alias_string + 1);
dfd42a3c 258 }
0347a8c7 259 count = split_cmdline(alias_string, &new_argv);
dc4179f9 260 if (count < 0)
ad9ac6db
GB
261 die("Bad alias.%s string: %s", alias_command,
262 split_cmdline_strerror(count));
4394efec
ML
263 option_count = handle_options(&new_argv, &count, &envchanged);
264 if (envchanged)
265 die("alias '%s' changes environment variables\n"
266 "You can use '!git' in the alias to do this.",
267 alias_command);
0347a8c7
ML
268 memmove(new_argv - option_count, new_argv,
269 count * sizeof(char *));
270 new_argv -= option_count;
271
272 if (count < 1)
273 die("empty alias for %s", alias_command);
274
275 if (!strcmp(alias_command, new_argv[0]))
276 die("recursive alias: %s", alias_command);
277
b319ce4c 278 trace_argv_printf(new_argv,
6ce4e61f
CC
279 "trace: alias expansion: %s =>",
280 alias_command);
575ba9d6 281
2756ca43 282 REALLOC_ARRAY(new_argv, count + *argcp);
0347a8c7 283 /* insert after command name */
4b25d091 284 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
2b11e317 285
0347a8c7
ML
286 *argv = new_argv;
287 *argcp += count - 1;
2b11e317 288
0347a8c7 289 ret = 1;
2b11e317
JS
290 }
291
7be77de2 292 if (subdir && chdir(subdir))
d824cbba 293 die_errno("Cannot change to '%s'", subdir);
2b11e317 294
47e5c0ca
JS
295 errno = saved_errno;
296
2b11e317
JS
297 return ret;
298}
299
ee38dfb8
NTND
300#define RUN_SETUP (1<<0)
301#define RUN_SETUP_GENTLY (1<<1)
302#define USE_PAGER (1<<2)
7eff28a9
SP
303/*
304 * require working tree to be present -- anything uses this needs
305 * RUN_SETUP for reading from the configuration file.
306 */
ee38dfb8 307#define NEED_WORK_TREE (1<<3)
c0562611 308#define NO_SETUP (1<<4)
a633fca0 309
47d0b4ff
LT
310struct cmd_struct {
311 const char *cmd;
312 int (*fn)(int, const char **, const char *);
313 int option;
314};
315
f172f334 316static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
47d0b4ff 317{
99caeed0 318 int status, help;
0f157315 319 struct stat st;
47d0b4ff
LT
320 const char *prefix;
321
322 prefix = NULL;
99caeed0
JN
323 help = argc == 2 && !strcmp(argv[1], "-h");
324 if (!help) {
325 if (p->option & RUN_SETUP)
326 prefix = setup_git_directory();
27bd38d4 327 else if (p->option & RUN_SETUP_GENTLY) {
ee38dfb8
NTND
328 int nongit_ok;
329 prefix = setup_git_directory_gently(&nongit_ok);
330 }
99caeed0 331
ee38dfb8 332 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
99caeed0
JN
333 use_pager = check_pager_config(p->cmd);
334 if (use_pager == -1 && p->option & USE_PAGER)
335 use_pager = 1;
a9ca8a85
NTND
336
337 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
338 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
339 trace_repo_setup(prefix);
99caeed0 340 }
4e10738a
JK
341 commit_pager_choice();
342
99caeed0 343 if (!help && p->option & NEED_WORK_TREE)
59f0f2f3
MH
344 setup_work_tree();
345
b319ce4c 346 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 347
0f157315
LT
348 status = p->fn(argc, argv, prefix);
349 if (status)
47e3de0e 350 return status;
0f157315
LT
351
352 /* Somebody closed stdout? */
353 if (fstat(fileno(stdout), &st))
354 return 0;
355 /* Ignore write errors for pipes and sockets.. */
356 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
357 return 0;
358
359 /* Check for ENOSPC and EIO errors.. */
0227f988 360 if (fflush(stdout))
d824cbba 361 die_errno("write failure on standard output");
0227f988
LT
362 if (ferror(stdout))
363 die("unknown write failure on standard output");
364 if (fclose(stdout))
d824cbba 365 die_errno("close failed on standard output");
0f157315 366 return 0;
47d0b4ff
LT
367}
368
c6127fa3
SS
369static struct cmd_struct commands[] = {
370 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
371 { "annotate", cmd_annotate, RUN_SETUP },
372 { "apply", cmd_apply, RUN_SETUP_GENTLY },
373 { "archive", cmd_archive },
374 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
375 { "blame", cmd_blame, RUN_SETUP },
376 { "branch", cmd_branch, RUN_SETUP },
377 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
378 { "cat-file", cmd_cat_file, RUN_SETUP },
379 { "check-attr", cmd_check_attr, RUN_SETUP },
380 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
381 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
382 { "check-ref-format", cmd_check_ref_format },
383 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
384 { "checkout-index", cmd_checkout_index,
385 RUN_SETUP | NEED_WORK_TREE},
386 { "cherry", cmd_cherry, RUN_SETUP },
387 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
388 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
c0562611 389 { "clone", cmd_clone, NO_SETUP },
c6127fa3
SS
390 { "column", cmd_column, RUN_SETUP_GENTLY },
391 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
392 { "commit-tree", cmd_commit_tree, RUN_SETUP },
393 { "config", cmd_config, RUN_SETUP_GENTLY },
394 { "count-objects", cmd_count_objects, RUN_SETUP },
395 { "credential", cmd_credential, RUN_SETUP_GENTLY },
396 { "describe", cmd_describe, RUN_SETUP },
397 { "diff", cmd_diff },
398 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
399 { "diff-index", cmd_diff_index, RUN_SETUP },
400 { "diff-tree", cmd_diff_tree, RUN_SETUP },
401 { "fast-export", cmd_fast_export, RUN_SETUP },
402 { "fetch", cmd_fetch, RUN_SETUP },
403 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
404 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
405 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
406 { "format-patch", cmd_format_patch, RUN_SETUP },
407 { "fsck", cmd_fsck, RUN_SETUP },
408 { "fsck-objects", cmd_fsck, RUN_SETUP },
409 { "gc", cmd_gc, RUN_SETUP },
410 { "get-tar-commit-id", cmd_get_tar_commit_id },
411 { "grep", cmd_grep, RUN_SETUP_GENTLY },
412 { "hash-object", cmd_hash_object },
413 { "help", cmd_help },
414 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
c0562611
NTND
415 { "init", cmd_init_db, NO_SETUP },
416 { "init-db", cmd_init_db, NO_SETUP },
6634f054 417 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP },
c6127fa3
SS
418 { "log", cmd_log, RUN_SETUP },
419 { "ls-files", cmd_ls_files, RUN_SETUP },
420 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
421 { "ls-tree", cmd_ls_tree, RUN_SETUP },
422 { "mailinfo", cmd_mailinfo },
423 { "mailsplit", cmd_mailsplit },
424 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
425 { "merge-base", cmd_merge_base, RUN_SETUP },
426 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
427 { "merge-index", cmd_merge_index, RUN_SETUP },
428 { "merge-ours", cmd_merge_ours, RUN_SETUP },
429 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
430 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
431 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
432 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
433 { "merge-tree", cmd_merge_tree, RUN_SETUP },
434 { "mktag", cmd_mktag, RUN_SETUP },
435 { "mktree", cmd_mktree, RUN_SETUP },
436 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
437 { "name-rev", cmd_name_rev, RUN_SETUP },
438 { "notes", cmd_notes, RUN_SETUP },
439 { "pack-objects", cmd_pack_objects, RUN_SETUP },
440 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
441 { "pack-refs", cmd_pack_refs, RUN_SETUP },
442 { "patch-id", cmd_patch_id },
443 { "pickaxe", cmd_blame, RUN_SETUP },
444 { "prune", cmd_prune, RUN_SETUP },
445 { "prune-packed", cmd_prune_packed, RUN_SETUP },
446 { "push", cmd_push, RUN_SETUP },
447 { "read-tree", cmd_read_tree, RUN_SETUP },
448 { "receive-pack", cmd_receive_pack },
449 { "reflog", cmd_reflog, RUN_SETUP },
450 { "remote", cmd_remote, RUN_SETUP },
451 { "remote-ext", cmd_remote_ext },
452 { "remote-fd", cmd_remote_fd },
453 { "repack", cmd_repack, RUN_SETUP },
454 { "replace", cmd_replace, RUN_SETUP },
455 { "rerere", cmd_rerere, RUN_SETUP },
456 { "reset", cmd_reset, RUN_SETUP },
457 { "rev-list", cmd_rev_list, RUN_SETUP },
458 { "rev-parse", cmd_rev_parse },
459 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
460 { "rm", cmd_rm, RUN_SETUP },
461 { "send-pack", cmd_send_pack, RUN_SETUP },
462 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
463 { "show", cmd_show, RUN_SETUP },
464 { "show-branch", cmd_show_branch, RUN_SETUP },
465 { "show-ref", cmd_show_ref, RUN_SETUP },
466 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
467 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
468 { "stripspace", cmd_stripspace },
469 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
470 { "tag", cmd_tag, RUN_SETUP },
471 { "unpack-file", cmd_unpack_file, RUN_SETUP },
472 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
473 { "update-index", cmd_update_index, RUN_SETUP },
474 { "update-ref", cmd_update_ref, RUN_SETUP },
475 { "update-server-info", cmd_update_server_info, RUN_SETUP },
476 { "upload-archive", cmd_upload_archive },
477 { "upload-archive--writer", cmd_upload_archive_writer },
478 { "var", cmd_var, RUN_SETUP_GENTLY },
d07b00b7 479 { "verify-commit", cmd_verify_commit, RUN_SETUP },
c6127fa3
SS
480 { "verify-pack", cmd_verify_pack },
481 { "verify-tag", cmd_verify_tag, RUN_SETUP },
482 { "version", cmd_version },
483 { "whatchanged", cmd_whatchanged, RUN_SETUP },
484 { "write-tree", cmd_write_tree, RUN_SETUP },
485};
486
c4f901d1 487static struct cmd_struct *get_builtin(const char *s)
c6127fa3
SS
488{
489 int i;
490 for (i = 0; i < ARRAY_SIZE(commands); i++) {
c4f901d1 491 struct cmd_struct *p = commands + i;
c6127fa3 492 if (!strcmp(s, p->cmd))
c4f901d1 493 return p;
c6127fa3 494 }
c4f901d1
SV
495 return NULL;
496}
497
498int is_builtin(const char *s)
499{
500 return !!get_builtin(s);
c6127fa3
SS
501}
502
3f784a4d 503static void handle_builtin(int argc, const char **argv)
231af832
LT
504{
505 const char *cmd = argv[0];
231af832 506 int i;
23326d14 507 static const char ext[] = STRIP_EXTENSION;
c4f901d1 508 struct cmd_struct *builtin;
23326d14
JS
509
510 if (sizeof(ext) > 1) {
511 i = strlen(argv[0]) - strlen(ext);
512 if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d 513 char *argv0 = xstrdup(argv[0]);
23326d14
JS
514 argv[0] = cmd = argv0;
515 argv0[i] = '\0';
516 }
517 }
231af832 518
1cd95087
LT
519 /* Turn "git cmd --help" into "git help cmd" */
520 if (argc > 1 && !strcmp(argv[1], "--help")) {
521 argv[1] = argv[0];
522 argv[0] = cmd = "help";
523 }
524
c4f901d1
SV
525 builtin = get_builtin(cmd);
526 if (builtin) {
527 if (saved_environment && (builtin->option & NO_SETUP))
c0562611 528 restore_env();
c4f901d1
SV
529 else
530 exit(run_builtin(builtin, argc, argv));
231af832
LT
531 }
532}
533
7550be0a
JH
534static void execv_dashed_external(const char **argv)
535{
f285a2d7 536 struct strbuf cmd = STRBUF_INIT;
7550be0a 537 const char *tmp;
d8e96fd8 538 int status;
7550be0a 539
92058e4d
JK
540 if (use_pager == -1)
541 use_pager = check_pager_config(argv[0]);
030149a4
JN
542 commit_pager_choice();
543
7550be0a
JH
544 strbuf_addf(&cmd, "git-%s", argv[0]);
545
546 /*
547 * argv[0] must be the git command, but the argv array
548 * belongs to the caller, and may be reused in
549 * subsequent loop iterations. Save argv[0] and
550 * restore it on error.
551 */
552 tmp = argv[0];
553 argv[0] = cmd.buf;
554
555 trace_argv_printf(argv, "trace: exec:");
556
d8e96fd8
JK
557 /*
558 * if we fail because the command is not found, it is
559 * OK to return. Otherwise, we just pass along the status code.
560 */
10c6cddd 561 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
0ac77ec3 562 if (status >= 0 || errno != ENOENT)
5709e036 563 exit(status);
7550be0a
JH
564
565 argv[0] = tmp;
566
567 strbuf_release(&cmd);
568}
569
a907e1b6
AS
570static int run_argv(int *argcp, const char ***argv)
571{
572 int done_alias = 0;
573
574 while (1) {
3f784a4d
SS
575 /* See if it's a builtin */
576 handle_builtin(*argcp, *argv);
a907e1b6
AS
577
578 /* .. then try the external ones */
579 execv_dashed_external(*argv);
580
581 /* It could be an alias -- this works around the insanity
582 * of overriding "git log" with "git show" by having
583 * alias.log = show
584 */
c0562611
NTND
585 if (done_alias)
586 break;
587 save_env();
588 if (!handle_alias(argcp, argv))
a907e1b6
AS
589 break;
590 done_alias = 1;
591 }
592
593 return done_alias;
594}
595
7559a1be
PR
596/*
597 * Many parts of Git have subprograms communicate via pipe, expect the
598 * upstream of a pipe to die with SIGPIPE when the downstream of a
599 * pipe does not need to read all that is written. Some third-party
600 * programs that ignore or block SIGPIPE for their own reason forget
601 * to restore SIGPIPE handling to the default before spawning Git and
602 * break this carefully orchestrated machinery.
603 *
604 * Restore the way SIGPIPE is handled to default, which is what we
605 * expect.
606 */
607static void restore_sigpipe_to_default(void)
608{
609 sigset_t unblock;
610
611 sigemptyset(&unblock);
612 sigaddset(&unblock, SIGPIPE);
613 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
614 signal(SIGPIPE, SIG_DFL);
615}
7550be0a 616
84d32bf7 617int main(int argc, char **av)
8e49d503 618{
84d32bf7 619 const char **argv = (const char **) av;
4dd47c3b 620 const char *cmd;
231af832 621
e37c1329
NTND
622 startup_info = &git_startup_info;
623
2cd72b0b
SP
624 cmd = git_extract_argv0_path(argv[0]);
625 if (!cmd)
4dd47c3b 626 cmd = "git-help";
8e49d503 627
a11c3964
TR
628 /*
629 * Always open file descriptors 0/1/2 to avoid clobbering files
630 * in die(). It also avoids messing up when the pipes are dup'ed
631 * onto stdin/stdout/stderr in the child processes we spawn.
632 */
633 sanitize_stdfds();
634
7559a1be
PR
635 restore_sigpipe_to_default();
636
5e9637c6
ÆAB
637 git_setup_gettext();
638
578da039
KB
639 trace_command_performance(argv);
640
231af832
LT
641 /*
642 * "git-xxxx" is the same as "git xxxx", but we obviously:
643 *
644 * - cannot take flags in between the "git" and the "xxxx".
645 * - cannot execute it externally (since it would just do
646 * the same thing over again)
647 *
3f784a4d
SS
648 * So we just directly call the builtin handler, and die if
649 * that one cannot handle it.
231af832 650 */
ae021d87 651 if (skip_prefix(cmd, "git-", &cmd)) {
231af832 652 argv[0] = cmd;
3f784a4d
SS
653 handle_builtin(argc, argv);
654 die("cannot handle %s as a builtin", cmd);
231af832 655 }
8e49d503 656
231af832 657 /* Look for flags.. */
6acbcb92
JS
658 argv++;
659 argc--;
4394efec 660 handle_options(&argv, &argc, NULL);
6acbcb92 661 if (argc > 0) {
6d877803
JK
662 /* translate --help and --version into commands */
663 skip_prefix(argv[0], "--", &argv[0]);
6acbcb92 664 } else {
3d7e2d85 665 /* The user didn't specify a command; give them help */
73e25e7c 666 commit_pager_choice();
3d7e2d85
SP
667 printf("usage: %s\n\n", git_usage_string);
668 list_common_cmds_help();
421a9769 669 printf("\n%s\n", _(git_more_info_string));
3d7e2d85 670 exit(1);
97fc6c5f 671 }
6acbcb92 672 cmd = argv[0];
231af832
LT
673
674 /*
511707d4 675 * We use PATH to find git commands, but we prepend some higher
3ea3c215 676 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4
SP
677 * environment, and the $(gitexecdir) from the Makefile at build
678 * time.
231af832 679 */
e1464ca7 680 setup_path();
8e49d503 681
a025463b 682 while (1) {
a907e1b6
AS
683 static int done_help = 0;
684 static int was_alias = 0;
685 was_alias = run_argv(&argc, &argv);
686 if (errno != ENOENT)
a025463b 687 break;
a907e1b6 688 if (was_alias) {
f3dd015c 689 fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7 690 "'%s' is not a git command\n",
f3dd015c
TT
691 cmd, argv[0]);
692 exit(1);
693 }
a907e1b6
AS
694 if (!done_help) {
695 cmd = argv[0] = help_unknown_cmd(cmd);
696 done_help = 1;
697 } else
698 break;
f3dd015c 699 }
10b15b86
AR
700
701 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 702 cmd, strerror(errno));
8e49d503
AE
703
704 return 1;
705}