git: remove an early return from save_env_before_alias()
[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"
9c9b4f2f 9 " [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n"
a1bea2c1 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];
0d5466d2 28static int saved_env_before_alias;
c0562611 29
0d5466d2 30static void save_env_before_alias(void)
c0562611
NTND
31{
32 int i;
0d5466d2 33 saved_env_before_alias = 1;
f655651e 34 orig_cwd = xgetcwd();
c0562611
NTND
35 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
36 orig_env[i] = getenv(env_names[i]);
37 if (orig_env[i])
38 orig_env[i] = xstrdup(orig_env[i]);
39 }
40}
41
57ea7123 42static void restore_env(int external_alias)
c0562611
NTND
43{
44 int i;
57ea7123 45 if (!external_alias && orig_cwd && chdir(orig_cwd))
c0562611 46 die_errno("could not move to %s", orig_cwd);
f655651e 47 free(orig_cwd);
c0562611 48 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
57ea7123
NTND
49 if (external_alias &&
50 !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
51 continue;
c0562611
NTND
52 if (orig_env[i])
53 setenv(env_names[i], orig_env[i], 1);
54 else
55 unsetenv(env_names[i]);
56 }
57}
4e10738a
JK
58
59static void commit_pager_choice(void) {
60 switch (use_pager) {
61 case 0:
62 setenv("GIT_PAGER", "cat", 1);
63 break;
64 case 1:
65 setup_pager();
66 break;
67 default:
68 break;
69 }
70}
71
4b25d091 72static int handle_options(const char ***argv, int *argc, int *envchanged)
4ab243a9 73{
73546c08 74 const char **orig_argv = *argv;
4ab243a9
JS
75
76 while (*argc > 0) {
77 const char *cmd = (*argv)[0];
78 if (cmd[0] != '-')
79 break;
80
6acbcb92
JS
81 /*
82 * For legacy reasons, the "version" and "help"
83 * commands can be written with "--" prepended
84 * to make them look like flags.
85 */
86 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
87 break;
88
89 /*
90 * Check remaining flags.
91 */
ae021d87 92 if (skip_prefix(cmd, "--exec-path", &cmd)) {
6acbcb92 93 if (*cmd == '=')
384df833 94 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
95 else {
96 puts(git_exec_path());
97 exit(0);
98 }
89a56bfb
MH
99 } else if (!strcmp(cmd, "--html-path")) {
100 puts(system_path(GIT_HTML_PATH));
101 exit(0);
f2dd8c37
JS
102 } else if (!strcmp(cmd, "--man-path")) {
103 puts(system_path(GIT_MAN_PATH));
104 exit(0);
105 } else if (!strcmp(cmd, "--info-path")) {
106 puts(system_path(GIT_INFO_PATH));
107 exit(0);
6acbcb92 108 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 109 use_pager = 1;
463a849d 110 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 111 use_pager = 0;
463a849d
MM
112 if (envchanged)
113 *envchanged = 1;
b0fa7ab5 114 } else if (!strcmp(cmd, "--no-replace-objects")) {
afc711b8 115 check_replace_refs = 0;
6476b38b
CC
116 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
117 if (envchanged)
118 *envchanged = 1;
6acbcb92 119 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
120 if (*argc < 2) {
121 fprintf(stderr, "No directory given for --git-dir.\n" );
122 usage(git_usage_string);
123 }
45b09794 124 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
125 if (envchanged)
126 *envchanged = 1;
6acbcb92
JS
127 (*argv)++;
128 (*argc)--;
ae021d87
JK
129 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
130 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
4394efec
ML
131 if (envchanged)
132 *envchanged = 1;
a1bea2c1
JT
133 } else if (!strcmp(cmd, "--namespace")) {
134 if (*argc < 2) {
135 fprintf(stderr, "No namespace given for --namespace.\n" );
136 usage(git_usage_string);
137 }
138 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
139 if (envchanged)
140 *envchanged = 1;
141 (*argv)++;
142 (*argc)--;
ae021d87
JK
143 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
144 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
a1bea2c1
JT
145 if (envchanged)
146 *envchanged = 1;
892c41b9
ML
147 } else if (!strcmp(cmd, "--work-tree")) {
148 if (*argc < 2) {
149 fprintf(stderr, "No directory given for --work-tree.\n" );
150 usage(git_usage_string);
151 }
152 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
153 if (envchanged)
154 *envchanged = 1;
892c41b9
ML
155 (*argv)++;
156 (*argc)--;
ae021d87
JK
157 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
158 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
4394efec
ML
159 if (envchanged)
160 *envchanged = 1;
6acbcb92 161 } else if (!strcmp(cmd, "--bare")) {
4d3ab44d 162 char *cwd = xgetcwd();
6adcca3f 163 is_bare_repository_cfg = 1;
4d3ab44d
RS
164 setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
165 free(cwd);
2cd83d10 166 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
4394efec
ML
167 if (envchanged)
168 *envchanged = 1;
8b1fa778
AR
169 } else if (!strcmp(cmd, "-c")) {
170 if (*argc < 2) {
171 fprintf(stderr, "-c expects a configuration string\n" );
172 usage(git_usage_string);
173 }
2b64fc89 174 git_config_push_parameter((*argv)[1]);
8b1fa778
AR
175 (*argv)++;
176 (*argc)--;
823ab40f
JK
177 } else if (!strcmp(cmd, "--literal-pathspecs")) {
178 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
179 if (envchanged)
180 *envchanged = 1;
181 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
182 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
183 if (envchanged)
184 *envchanged = 1;
bd30c2e4
NTND
185 } else if (!strcmp(cmd, "--glob-pathspecs")) {
186 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
187 if (envchanged)
188 *envchanged = 1;
189 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
190 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
191 if (envchanged)
192 *envchanged = 1;
93d93537
NTND
193 } else if (!strcmp(cmd, "--icase-pathspecs")) {
194 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
195 if (envchanged)
196 *envchanged = 1;
6035d6aa
NTND
197 } else if (!strcmp(cmd, "--shallow-file")) {
198 (*argv)++;
199 (*argc)--;
069c0532 200 set_alternate_shallow_file((*argv)[0], 1);
6035d6aa
NTND
201 if (envchanged)
202 *envchanged = 1;
44e1e4d6
NR
203 } else if (!strcmp(cmd, "-C")) {
204 if (*argc < 2) {
205 fprintf(stderr, "No directory given for -C.\n" );
206 usage(git_usage_string);
207 }
6a536e20
KN
208 if ((*argv)[1][0]) {
209 if (chdir((*argv)[1]))
210 die_errno("Cannot change to '%s'", (*argv)[1]);
211 if (envchanged)
212 *envchanged = 1;
213 }
44e1e4d6
NR
214 (*argv)++;
215 (*argc)--;
6acbcb92
JS
216 } else {
217 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 218 usage(git_usage_string);
6acbcb92 219 }
4ab243a9
JS
220
221 (*argv)++;
222 (*argc)--;
4ab243a9 223 }
73546c08 224 return (*argv) - orig_argv;
4ab243a9
JS
225}
226
2b11e317
JS
227static int handle_alias(int *argcp, const char ***argv)
228{
af05d679 229 int envchanged = 0, ret = 0, saved_errno = errno;
0347a8c7 230 int count, option_count;
4b25d091 231 const char **new_argv;
94351118
JK
232 const char *alias_command;
233 char *alias_string;
e85dc0a3 234 int unused_nongit;
2b11e317 235
0d5466d2 236 save_env_before_alias();
86d26f24 237 setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
238
239 alias_command = (*argv)[0];
94351118 240 alias_string = alias_lookup(alias_command);
0347a8c7 241 if (alias_string) {
dfd42a3c 242 if (alias_string[0] == '!') {
7f51f8bc
EFL
243 const char **alias_argv;
244 int argc = *argcp, i;
245
030149a4 246 commit_pager_choice();
57ea7123 247 restore_env(1);
7f51f8bc
EFL
248
249 /* build alias_argv */
250 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
251 alias_argv[0] = alias_string + 1;
252 for (i = 1; i < argc; ++i)
253 alias_argv[i] = (*argv)[i];
254 alias_argv[argc] = NULL;
255
26b05251 256 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
7f51f8bc
EFL
257 if (ret >= 0) /* normal exit */
258 exit(ret);
259
260 die_errno("While expanding alias '%s': '%s'",
261 alias_command, alias_string + 1);
dfd42a3c 262 }
0347a8c7 263 count = split_cmdline(alias_string, &new_argv);
dc4179f9 264 if (count < 0)
ad9ac6db
GB
265 die("Bad alias.%s string: %s", alias_command,
266 split_cmdline_strerror(count));
4394efec
ML
267 option_count = handle_options(&new_argv, &count, &envchanged);
268 if (envchanged)
269 die("alias '%s' changes environment variables\n"
270 "You can use '!git' in the alias to do this.",
271 alias_command);
0347a8c7
ML
272 memmove(new_argv - option_count, new_argv,
273 count * sizeof(char *));
274 new_argv -= option_count;
275
276 if (count < 1)
277 die("empty alias for %s", alias_command);
278
279 if (!strcmp(alias_command, new_argv[0]))
280 die("recursive alias: %s", alias_command);
281
b319ce4c 282 trace_argv_printf(new_argv,
6ce4e61f
CC
283 "trace: alias expansion: %s =>",
284 alias_command);
575ba9d6 285
2756ca43 286 REALLOC_ARRAY(new_argv, count + *argcp);
0347a8c7 287 /* insert after command name */
4b25d091 288 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
2b11e317 289
0347a8c7
ML
290 *argv = new_argv;
291 *argcp += count - 1;
2b11e317 292
0347a8c7 293 ret = 1;
2b11e317
JS
294 }
295
57ea7123 296 restore_env(0);
2b11e317 297
47e5c0ca
JS
298 errno = saved_errno;
299
2b11e317
JS
300 return ret;
301}
302
ee38dfb8
NTND
303#define RUN_SETUP (1<<0)
304#define RUN_SETUP_GENTLY (1<<1)
305#define USE_PAGER (1<<2)
7eff28a9
SP
306/*
307 * require working tree to be present -- anything uses this needs
308 * RUN_SETUP for reading from the configuration file.
309 */
ee38dfb8 310#define NEED_WORK_TREE (1<<3)
a633fca0 311
47d0b4ff
LT
312struct cmd_struct {
313 const char *cmd;
314 int (*fn)(int, const char **, const char *);
315 int option;
316};
317
f172f334 318static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
47d0b4ff 319{
99caeed0 320 int status, help;
0f157315 321 struct stat st;
47d0b4ff
LT
322 const char *prefix;
323
324 prefix = NULL;
99caeed0
JN
325 help = argc == 2 && !strcmp(argv[1], "-h");
326 if (!help) {
327 if (p->option & RUN_SETUP)
328 prefix = setup_git_directory();
27bd38d4 329 else if (p->option & RUN_SETUP_GENTLY) {
ee38dfb8
NTND
330 int nongit_ok;
331 prefix = setup_git_directory_gently(&nongit_ok);
332 }
99caeed0 333
ee38dfb8 334 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
99caeed0
JN
335 use_pager = check_pager_config(p->cmd);
336 if (use_pager == -1 && p->option & USE_PAGER)
337 use_pager = 1;
a9ca8a85
NTND
338
339 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
340 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
341 trace_repo_setup(prefix);
99caeed0 342 }
4e10738a
JK
343 commit_pager_choice();
344
99caeed0 345 if (!help && p->option & NEED_WORK_TREE)
59f0f2f3
MH
346 setup_work_tree();
347
b319ce4c 348 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 349
0f157315
LT
350 status = p->fn(argc, argv, prefix);
351 if (status)
47e3de0e 352 return status;
0f157315
LT
353
354 /* Somebody closed stdout? */
355 if (fstat(fileno(stdout), &st))
356 return 0;
357 /* Ignore write errors for pipes and sockets.. */
358 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
359 return 0;
360
361 /* Check for ENOSPC and EIO errors.. */
0227f988 362 if (fflush(stdout))
d824cbba 363 die_errno("write failure on standard output");
0227f988
LT
364 if (ferror(stdout))
365 die("unknown write failure on standard output");
366 if (fclose(stdout))
d824cbba 367 die_errno("close failed on standard output");
0f157315 368 return 0;
47d0b4ff
LT
369}
370
c6127fa3
SS
371static struct cmd_struct commands[] = {
372 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
373 { "annotate", cmd_annotate, RUN_SETUP },
374 { "apply", cmd_apply, RUN_SETUP_GENTLY },
375 { "archive", cmd_archive },
376 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
377 { "blame", cmd_blame, RUN_SETUP },
378 { "branch", cmd_branch, RUN_SETUP },
379 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
380 { "cat-file", cmd_cat_file, RUN_SETUP },
381 { "check-attr", cmd_check_attr, RUN_SETUP },
382 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
383 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
384 { "check-ref-format", cmd_check_ref_format },
0ca560cb 385 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
c6127fa3
SS
386 { "checkout-index", cmd_checkout_index,
387 RUN_SETUP | NEED_WORK_TREE},
388 { "cherry", cmd_cherry, RUN_SETUP },
389 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
390 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
86d26f24 391 { "clone", cmd_clone },
c6127fa3
SS
392 { "column", cmd_column, RUN_SETUP_GENTLY },
393 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
394 { "commit-tree", cmd_commit_tree, RUN_SETUP },
395 { "config", cmd_config, RUN_SETUP_GENTLY },
396 { "count-objects", cmd_count_objects, RUN_SETUP },
397 { "credential", cmd_credential, RUN_SETUP_GENTLY },
398 { "describe", cmd_describe, RUN_SETUP },
399 { "diff", cmd_diff },
400 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
401 { "diff-index", cmd_diff_index, RUN_SETUP },
402 { "diff-tree", cmd_diff_tree, RUN_SETUP },
403 { "fast-export", cmd_fast_export, RUN_SETUP },
404 { "fetch", cmd_fetch, RUN_SETUP },
405 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
406 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
407 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
408 { "format-patch", cmd_format_patch, RUN_SETUP },
409 { "fsck", cmd_fsck, RUN_SETUP },
410 { "fsck-objects", cmd_fsck, RUN_SETUP },
411 { "gc", cmd_gc, RUN_SETUP },
412 { "get-tar-commit-id", cmd_get_tar_commit_id },
413 { "grep", cmd_grep, RUN_SETUP_GENTLY },
414 { "hash-object", cmd_hash_object },
415 { "help", cmd_help },
416 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
86d26f24
NTND
417 { "init", cmd_init_db },
418 { "init-db", cmd_init_db },
6634f054 419 { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP },
c6127fa3
SS
420 { "log", cmd_log, RUN_SETUP },
421 { "ls-files", cmd_ls_files, RUN_SETUP },
422 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
423 { "ls-tree", cmd_ls_tree, RUN_SETUP },
424 { "mailinfo", cmd_mailinfo },
425 { "mailsplit", cmd_mailsplit },
426 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
427 { "merge-base", cmd_merge_base, RUN_SETUP },
428 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
429 { "merge-index", cmd_merge_index, RUN_SETUP },
430 { "merge-ours", cmd_merge_ours, RUN_SETUP },
431 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
432 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
433 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
434 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
435 { "merge-tree", cmd_merge_tree, RUN_SETUP },
436 { "mktag", cmd_mktag, RUN_SETUP },
437 { "mktree", cmd_mktree, RUN_SETUP },
438 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
439 { "name-rev", cmd_name_rev, RUN_SETUP },
440 { "notes", cmd_notes, RUN_SETUP },
441 { "pack-objects", cmd_pack_objects, RUN_SETUP },
442 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
443 { "pack-refs", cmd_pack_refs, RUN_SETUP },
444 { "patch-id", cmd_patch_id },
445 { "pickaxe", cmd_blame, RUN_SETUP },
446 { "prune", cmd_prune, RUN_SETUP },
447 { "prune-packed", cmd_prune_packed, RUN_SETUP },
448 { "push", cmd_push, RUN_SETUP },
449 { "read-tree", cmd_read_tree, RUN_SETUP },
450 { "receive-pack", cmd_receive_pack },
451 { "reflog", cmd_reflog, RUN_SETUP },
452 { "remote", cmd_remote, RUN_SETUP },
453 { "remote-ext", cmd_remote_ext },
454 { "remote-fd", cmd_remote_fd },
455 { "repack", cmd_repack, RUN_SETUP },
456 { "replace", cmd_replace, RUN_SETUP },
457 { "rerere", cmd_rerere, RUN_SETUP },
458 { "reset", cmd_reset, RUN_SETUP },
459 { "rev-list", cmd_rev_list, RUN_SETUP },
460 { "rev-parse", cmd_rev_parse },
461 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
462 { "rm", cmd_rm, RUN_SETUP },
463 { "send-pack", cmd_send_pack, RUN_SETUP },
464 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
465 { "show", cmd_show, RUN_SETUP },
466 { "show-branch", cmd_show_branch, RUN_SETUP },
467 { "show-ref", cmd_show_ref, RUN_SETUP },
468 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
469 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
470 { "stripspace", cmd_stripspace },
471 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
472 { "tag", cmd_tag, RUN_SETUP },
473 { "unpack-file", cmd_unpack_file, RUN_SETUP },
474 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
475 { "update-index", cmd_update_index, RUN_SETUP },
476 { "update-ref", cmd_update_ref, RUN_SETUP },
477 { "update-server-info", cmd_update_server_info, RUN_SETUP },
478 { "upload-archive", cmd_upload_archive },
479 { "upload-archive--writer", cmd_upload_archive_writer },
480 { "var", cmd_var, RUN_SETUP_GENTLY },
d07b00b7 481 { "verify-commit", cmd_verify_commit, RUN_SETUP },
c6127fa3
SS
482 { "verify-pack", cmd_verify_pack },
483 { "verify-tag", cmd_verify_tag, RUN_SETUP },
484 { "version", cmd_version },
485 { "whatchanged", cmd_whatchanged, RUN_SETUP },
df0b6cfb 486 { "worktree", cmd_worktree, RUN_SETUP },
c6127fa3
SS
487 { "write-tree", cmd_write_tree, RUN_SETUP },
488};
489
c4f901d1 490static struct cmd_struct *get_builtin(const char *s)
c6127fa3
SS
491{
492 int i;
493 for (i = 0; i < ARRAY_SIZE(commands); i++) {
c4f901d1 494 struct cmd_struct *p = commands + i;
c6127fa3 495 if (!strcmp(s, p->cmd))
c4f901d1 496 return p;
c6127fa3 497 }
c4f901d1
SV
498 return NULL;
499}
500
501int is_builtin(const char *s)
502{
503 return !!get_builtin(s);
c6127fa3
SS
504}
505
3f784a4d 506static void handle_builtin(int argc, const char **argv)
231af832
LT
507{
508 const char *cmd = argv[0];
231af832 509 int i;
23326d14 510 static const char ext[] = STRIP_EXTENSION;
c4f901d1 511 struct cmd_struct *builtin;
23326d14
JS
512
513 if (sizeof(ext) > 1) {
514 i = strlen(argv[0]) - strlen(ext);
515 if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d 516 char *argv0 = xstrdup(argv[0]);
23326d14
JS
517 argv[0] = cmd = argv0;
518 argv0[i] = '\0';
519 }
520 }
231af832 521
1cd95087
LT
522 /* Turn "git cmd --help" into "git help cmd" */
523 if (argc > 1 && !strcmp(argv[1], "--help")) {
524 argv[1] = argv[0];
525 argv[0] = cmd = "help";
526 }
527
c4f901d1
SV
528 builtin = get_builtin(cmd);
529 if (builtin) {
86d26f24
NTND
530 /*
531 * XXX: if we can figure out cases where it is _safe_
532 * to do, we can avoid spawning a new process when
533 * saved_env_before_alias is true
534 * (i.e. setup_git_dir* has been run once)
535 */
536 if (!saved_env_before_alias)
c4f901d1 537 exit(run_builtin(builtin, argc, argv));
231af832
LT
538 }
539}
540
7550be0a
JH
541static void execv_dashed_external(const char **argv)
542{
f285a2d7 543 struct strbuf cmd = STRBUF_INIT;
7550be0a 544 const char *tmp;
d8e96fd8 545 int status;
7550be0a 546
92058e4d
JK
547 if (use_pager == -1)
548 use_pager = check_pager_config(argv[0]);
030149a4
JN
549 commit_pager_choice();
550
7550be0a
JH
551 strbuf_addf(&cmd, "git-%s", argv[0]);
552
553 /*
554 * argv[0] must be the git command, but the argv array
555 * belongs to the caller, and may be reused in
556 * subsequent loop iterations. Save argv[0] and
557 * restore it on error.
558 */
559 tmp = argv[0];
560 argv[0] = cmd.buf;
561
562 trace_argv_printf(argv, "trace: exec:");
563
d8e96fd8
JK
564 /*
565 * if we fail because the command is not found, it is
566 * OK to return. Otherwise, we just pass along the status code.
567 */
10c6cddd 568 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
0ac77ec3 569 if (status >= 0 || errno != ENOENT)
5709e036 570 exit(status);
7550be0a
JH
571
572 argv[0] = tmp;
573
574 strbuf_release(&cmd);
575}
576
a907e1b6
AS
577static int run_argv(int *argcp, const char ***argv)
578{
579 int done_alias = 0;
580
581 while (1) {
3f784a4d
SS
582 /* See if it's a builtin */
583 handle_builtin(*argcp, *argv);
a907e1b6
AS
584
585 /* .. then try the external ones */
586 execv_dashed_external(*argv);
587
588 /* It could be an alias -- this works around the insanity
589 * of overriding "git log" with "git show" by having
590 * alias.log = show
591 */
c0562611
NTND
592 if (done_alias)
593 break;
c0562611 594 if (!handle_alias(argcp, argv))
a907e1b6
AS
595 break;
596 done_alias = 1;
597 }
598
599 return done_alias;
600}
601
7559a1be
PR
602/*
603 * Many parts of Git have subprograms communicate via pipe, expect the
604 * upstream of a pipe to die with SIGPIPE when the downstream of a
605 * pipe does not need to read all that is written. Some third-party
606 * programs that ignore or block SIGPIPE for their own reason forget
607 * to restore SIGPIPE handling to the default before spawning Git and
608 * break this carefully orchestrated machinery.
609 *
610 * Restore the way SIGPIPE is handled to default, which is what we
611 * expect.
612 */
613static void restore_sigpipe_to_default(void)
614{
615 sigset_t unblock;
616
617 sigemptyset(&unblock);
618 sigaddset(&unblock, SIGPIPE);
619 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
620 signal(SIGPIPE, SIG_DFL);
621}
7550be0a 622
84d32bf7 623int main(int argc, char **av)
8e49d503 624{
84d32bf7 625 const char **argv = (const char **) av;
4dd47c3b 626 const char *cmd;
8fa7975b 627 int done_help = 0;
231af832 628
e37c1329
NTND
629 startup_info = &git_startup_info;
630
2cd72b0b
SP
631 cmd = git_extract_argv0_path(argv[0]);
632 if (!cmd)
4dd47c3b 633 cmd = "git-help";
8e49d503 634
a11c3964
TR
635 /*
636 * Always open file descriptors 0/1/2 to avoid clobbering files
637 * in die(). It also avoids messing up when the pipes are dup'ed
638 * onto stdin/stdout/stderr in the child processes we spawn.
639 */
640 sanitize_stdfds();
641
7559a1be
PR
642 restore_sigpipe_to_default();
643
5e9637c6
ÆAB
644 git_setup_gettext();
645
578da039
KB
646 trace_command_performance(argv);
647
231af832
LT
648 /*
649 * "git-xxxx" is the same as "git xxxx", but we obviously:
650 *
651 * - cannot take flags in between the "git" and the "xxxx".
652 * - cannot execute it externally (since it would just do
653 * the same thing over again)
654 *
3f784a4d
SS
655 * So we just directly call the builtin handler, and die if
656 * that one cannot handle it.
231af832 657 */
ae021d87 658 if (skip_prefix(cmd, "git-", &cmd)) {
231af832 659 argv[0] = cmd;
3f784a4d
SS
660 handle_builtin(argc, argv);
661 die("cannot handle %s as a builtin", cmd);
231af832 662 }
8e49d503 663
231af832 664 /* Look for flags.. */
6acbcb92
JS
665 argv++;
666 argc--;
4394efec 667 handle_options(&argv, &argc, NULL);
6acbcb92 668 if (argc > 0) {
6d877803
JK
669 /* translate --help and --version into commands */
670 skip_prefix(argv[0], "--", &argv[0]);
6acbcb92 671 } else {
3d7e2d85 672 /* The user didn't specify a command; give them help */
73e25e7c 673 commit_pager_choice();
3d7e2d85
SP
674 printf("usage: %s\n\n", git_usage_string);
675 list_common_cmds_help();
421a9769 676 printf("\n%s\n", _(git_more_info_string));
3d7e2d85 677 exit(1);
97fc6c5f 678 }
6acbcb92 679 cmd = argv[0];
231af832
LT
680
681 /*
511707d4 682 * We use PATH to find git commands, but we prepend some higher
3ea3c215 683 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4
SP
684 * environment, and the $(gitexecdir) from the Makefile at build
685 * time.
231af832 686 */
e1464ca7 687 setup_path();
8e49d503 688
a025463b 689 while (1) {
8fa7975b 690 int was_alias = run_argv(&argc, &argv);
a907e1b6 691 if (errno != ENOENT)
a025463b 692 break;
a907e1b6 693 if (was_alias) {
f3dd015c 694 fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7 695 "'%s' is not a git command\n",
f3dd015c
TT
696 cmd, argv[0]);
697 exit(1);
698 }
a907e1b6
AS
699 if (!done_help) {
700 cmd = argv[0] = help_unknown_cmd(cmd);
701 done_help = 1;
702 } else
703 break;
f3dd015c 704 }
10b15b86
AR
705
706 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 707 cmd, strerror(errno));
8e49d503
AE
708
709 return 1;
710}