Merge branch 'nd/gitignore-trailing-whitespace' into maint
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
2b11e317 2#include "cache.h"
fd5c363d
TF
3#include "exec_cmd.h"
4#include "help.h"
575ba9d6 5#include "quote.h"
d8e96fd8 6#include "run-command.h"
6035d6aa 7#include "commit.h"
8e49d503 8
822a7d50 9const char git_usage_string[] =
44e1e4d6 10 "git [--version] [--help] [-C <path>] [-c name=value]\n"
03a0fb0c 11 " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
a1bea2c1
JT
12 " [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
13 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
62b4698e 14 " <command> [<args>]";
822a7d50 15
b7d96819 16const char git_more_info_string[] =
73903d0b
PO
17 N_("'git help -a' and 'git help -g' lists available subcommands and some\n"
18 "concept guides. See 'git help <command>' or 'git help <concept>'\n"
19 "to read about a specific subcommand or concept.");
b7d96819 20
e37c1329 21static struct startup_info git_startup_info;
4e10738a 22static int use_pager = -1;
c0562611
NTND
23static char orig_cwd[PATH_MAX];
24static const char *env_names[] = {
25 GIT_DIR_ENVIRONMENT,
26 GIT_WORK_TREE_ENVIRONMENT,
27 GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
28 GIT_PREFIX_ENVIRONMENT
29};
30static char *orig_env[4];
31static int saved_environment;
32
33static void save_env(void)
34{
35 int i;
36 if (saved_environment)
37 return;
38 saved_environment = 1;
39 if (!getcwd(orig_cwd, sizeof(orig_cwd)))
40 die_errno("cannot getcwd");
41 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
42 orig_env[i] = getenv(env_names[i]);
43 if (orig_env[i])
44 orig_env[i] = xstrdup(orig_env[i]);
45 }
46}
47
48static void restore_env(void)
49{
50 int i;
51 if (*orig_cwd && chdir(orig_cwd))
52 die_errno("could not move to %s", orig_cwd);
53 for (i = 0; i < ARRAY_SIZE(env_names); i++) {
54 if (orig_env[i])
55 setenv(env_names[i], orig_env[i], 1);
56 else
57 unsetenv(env_names[i]);
58 }
59}
4e10738a
JK
60
61static void commit_pager_choice(void) {
62 switch (use_pager) {
63 case 0:
64 setenv("GIT_PAGER", "cat", 1);
65 break;
66 case 1:
67 setup_pager();
68 break;
69 default:
70 break;
71 }
72}
73
4b25d091 74static int handle_options(const char ***argv, int *argc, int *envchanged)
4ab243a9 75{
73546c08 76 const char **orig_argv = *argv;
4ab243a9
JS
77
78 while (*argc > 0) {
79 const char *cmd = (*argv)[0];
80 if (cmd[0] != '-')
81 break;
82
6acbcb92
JS
83 /*
84 * For legacy reasons, the "version" and "help"
85 * commands can be written with "--" prepended
86 * to make them look like flags.
87 */
88 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
89 break;
90
91 /*
92 * Check remaining flags.
93 */
ae021d87 94 if (skip_prefix(cmd, "--exec-path", &cmd)) {
6acbcb92 95 if (*cmd == '=')
384df833 96 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
97 else {
98 puts(git_exec_path());
99 exit(0);
100 }
89a56bfb
MH
101 } else if (!strcmp(cmd, "--html-path")) {
102 puts(system_path(GIT_HTML_PATH));
103 exit(0);
f2dd8c37
JS
104 } else if (!strcmp(cmd, "--man-path")) {
105 puts(system_path(GIT_MAN_PATH));
106 exit(0);
107 } else if (!strcmp(cmd, "--info-path")) {
108 puts(system_path(GIT_INFO_PATH));
109 exit(0);
6acbcb92 110 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 111 use_pager = 1;
463a849d 112 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 113 use_pager = 0;
463a849d
MM
114 if (envchanged)
115 *envchanged = 1;
b0fa7ab5 116 } else if (!strcmp(cmd, "--no-replace-objects")) {
afc711b8 117 check_replace_refs = 0;
6476b38b
CC
118 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
119 if (envchanged)
120 *envchanged = 1;
6acbcb92 121 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
122 if (*argc < 2) {
123 fprintf(stderr, "No directory given for --git-dir.\n" );
124 usage(git_usage_string);
125 }
45b09794 126 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
127 if (envchanged)
128 *envchanged = 1;
6acbcb92
JS
129 (*argv)++;
130 (*argc)--;
ae021d87
JK
131 } else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
132 setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
4394efec
ML
133 if (envchanged)
134 *envchanged = 1;
a1bea2c1
JT
135 } else if (!strcmp(cmd, "--namespace")) {
136 if (*argc < 2) {
137 fprintf(stderr, "No namespace given for --namespace.\n" );
138 usage(git_usage_string);
139 }
140 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
141 if (envchanged)
142 *envchanged = 1;
143 (*argv)++;
144 (*argc)--;
ae021d87
JK
145 } else if (skip_prefix(cmd, "--namespace=", &cmd)) {
146 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
a1bea2c1
JT
147 if (envchanged)
148 *envchanged = 1;
892c41b9
ML
149 } else if (!strcmp(cmd, "--work-tree")) {
150 if (*argc < 2) {
151 fprintf(stderr, "No directory given for --work-tree.\n" );
152 usage(git_usage_string);
153 }
154 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
155 if (envchanged)
156 *envchanged = 1;
892c41b9
ML
157 (*argv)++;
158 (*argc)--;
ae021d87
JK
159 } else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
160 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
4394efec
ML
161 if (envchanged)
162 *envchanged = 1;
6acbcb92 163 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 164 static char git_dir[PATH_MAX+1];
6adcca3f 165 is_bare_repository_cfg = 1;
9277d602 166 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
2cd83d10 167 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
4394efec
ML
168 if (envchanged)
169 *envchanged = 1;
8b1fa778
AR
170 } else if (!strcmp(cmd, "-c")) {
171 if (*argc < 2) {
172 fprintf(stderr, "-c expects a configuration string\n" );
173 usage(git_usage_string);
174 }
2b64fc89 175 git_config_push_parameter((*argv)[1]);
8b1fa778
AR
176 (*argv)++;
177 (*argc)--;
823ab40f
JK
178 } else if (!strcmp(cmd, "--literal-pathspecs")) {
179 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
180 if (envchanged)
181 *envchanged = 1;
182 } else if (!strcmp(cmd, "--no-literal-pathspecs")) {
183 setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
184 if (envchanged)
185 *envchanged = 1;
bd30c2e4
NTND
186 } else if (!strcmp(cmd, "--glob-pathspecs")) {
187 setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
188 if (envchanged)
189 *envchanged = 1;
190 } else if (!strcmp(cmd, "--noglob-pathspecs")) {
191 setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
192 if (envchanged)
193 *envchanged = 1;
93d93537
NTND
194 } else if (!strcmp(cmd, "--icase-pathspecs")) {
195 setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
196 if (envchanged)
197 *envchanged = 1;
6035d6aa
NTND
198 } else if (!strcmp(cmd, "--shallow-file")) {
199 (*argv)++;
200 (*argc)--;
069c0532 201 set_alternate_shallow_file((*argv)[0], 1);
6035d6aa
NTND
202 if (envchanged)
203 *envchanged = 1;
44e1e4d6
NR
204 } else if (!strcmp(cmd, "-C")) {
205 if (*argc < 2) {
206 fprintf(stderr, "No directory given for -C.\n" );
207 usage(git_usage_string);
208 }
209 if (chdir((*argv)[1]))
210 die_errno("Cannot change to '%s'", (*argv)[1]);
211 if (envchanged)
212 *envchanged = 1;
213 (*argv)++;
214 (*argc)--;
6acbcb92
JS
215 } else {
216 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 217 usage(git_usage_string);
6acbcb92 218 }
4ab243a9
JS
219
220 (*argv)++;
221 (*argc)--;
4ab243a9 222 }
73546c08 223 return (*argv) - orig_argv;
4ab243a9
JS
224}
225
2b11e317
JS
226static int handle_alias(int *argcp, const char ***argv)
227{
af05d679 228 int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 229 const char *subdir;
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
e85dc0a3 236 subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
237
238 alias_command = (*argv)[0];
94351118 239 alias_string = alias_lookup(alias_command);
0347a8c7 240 if (alias_string) {
dfd42a3c 241 if (alias_string[0] == '!') {
7f51f8bc
EFL
242 const char **alias_argv;
243 int argc = *argcp, i;
244
030149a4 245 commit_pager_choice();
7f51f8bc
EFL
246
247 /* build alias_argv */
248 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
249 alias_argv[0] = alias_string + 1;
250 for (i = 1; i < argc; ++i)
251 alias_argv[i] = (*argv)[i];
252 alias_argv[argc] = NULL;
253
26b05251 254 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
7f51f8bc
EFL
255 if (ret >= 0) /* normal exit */
256 exit(ret);
257
258 die_errno("While expanding alias '%s': '%s'",
259 alias_command, alias_string + 1);
dfd42a3c 260 }
0347a8c7 261 count = split_cmdline(alias_string, &new_argv);
dc4179f9 262 if (count < 0)
ad9ac6db
GB
263 die("Bad alias.%s string: %s", alias_command,
264 split_cmdline_strerror(count));
4394efec
ML
265 option_count = handle_options(&new_argv, &count, &envchanged);
266 if (envchanged)
267 die("alias '%s' changes environment variables\n"
268 "You can use '!git' in the alias to do this.",
269 alias_command);
0347a8c7
ML
270 memmove(new_argv - option_count, new_argv,
271 count * sizeof(char *));
272 new_argv -= option_count;
273
274 if (count < 1)
275 die("empty alias for %s", alias_command);
276
277 if (!strcmp(alias_command, new_argv[0]))
278 die("recursive alias: %s", alias_command);
279
b319ce4c 280 trace_argv_printf(new_argv,
6ce4e61f
CC
281 "trace: alias expansion: %s =>",
282 alias_command);
575ba9d6 283
4b25d091 284 new_argv = xrealloc(new_argv, sizeof(char *) *
6167c136 285 (count + *argcp));
0347a8c7 286 /* insert after command name */
4b25d091 287 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
2b11e317 288
0347a8c7
ML
289 *argv = new_argv;
290 *argcp += count - 1;
2b11e317 291
0347a8c7 292 ret = 1;
2b11e317
JS
293 }
294
7be77de2 295 if (subdir && chdir(subdir))
d824cbba 296 die_errno("Cannot change to '%s'", subdir);
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)
c0562611 311#define NO_SETUP (1<<4)
a633fca0 312
47d0b4ff
LT
313struct cmd_struct {
314 const char *cmd;
315 int (*fn)(int, const char **, const char *);
316 int option;
317};
318
f172f334 319static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
47d0b4ff 320{
99caeed0 321 int status, help;
0f157315 322 struct stat st;
47d0b4ff
LT
323 const char *prefix;
324
325 prefix = NULL;
99caeed0
JN
326 help = argc == 2 && !strcmp(argv[1], "-h");
327 if (!help) {
328 if (p->option & RUN_SETUP)
329 prefix = setup_git_directory();
27bd38d4 330 else if (p->option & RUN_SETUP_GENTLY) {
ee38dfb8
NTND
331 int nongit_ok;
332 prefix = setup_git_directory_gently(&nongit_ok);
333 }
99caeed0 334
ee38dfb8 335 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
99caeed0
JN
336 use_pager = check_pager_config(p->cmd);
337 if (use_pager == -1 && p->option & USE_PAGER)
338 use_pager = 1;
a9ca8a85
NTND
339
340 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
341 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
342 trace_repo_setup(prefix);
99caeed0 343 }
4e10738a
JK
344 commit_pager_choice();
345
99caeed0 346 if (!help && p->option & NEED_WORK_TREE)
59f0f2f3
MH
347 setup_work_tree();
348
b319ce4c 349 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 350
0f157315
LT
351 status = p->fn(argc, argv, prefix);
352 if (status)
47e3de0e 353 return status;
0f157315
LT
354
355 /* Somebody closed stdout? */
356 if (fstat(fileno(stdout), &st))
357 return 0;
358 /* Ignore write errors for pipes and sockets.. */
359 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
360 return 0;
361
362 /* Check for ENOSPC and EIO errors.. */
0227f988 363 if (fflush(stdout))
d824cbba 364 die_errno("write failure on standard output");
0227f988
LT
365 if (ferror(stdout))
366 die("unknown write failure on standard output");
367 if (fclose(stdout))
d824cbba 368 die_errno("close failed on standard output");
0f157315 369 return 0;
47d0b4ff
LT
370}
371
c6127fa3
SS
372static struct cmd_struct commands[] = {
373 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
374 { "annotate", cmd_annotate, RUN_SETUP },
375 { "apply", cmd_apply, RUN_SETUP_GENTLY },
376 { "archive", cmd_archive },
377 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
378 { "blame", cmd_blame, RUN_SETUP },
379 { "branch", cmd_branch, RUN_SETUP },
380 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
381 { "cat-file", cmd_cat_file, RUN_SETUP },
382 { "check-attr", cmd_check_attr, RUN_SETUP },
383 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
384 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
385 { "check-ref-format", cmd_check_ref_format },
386 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
387 { "checkout-index", cmd_checkout_index,
388 RUN_SETUP | NEED_WORK_TREE},
389 { "cherry", cmd_cherry, RUN_SETUP },
390 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
391 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
c0562611 392 { "clone", cmd_clone, NO_SETUP },
c6127fa3
SS
393 { "column", cmd_column, RUN_SETUP_GENTLY },
394 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
395 { "commit-tree", cmd_commit_tree, RUN_SETUP },
396 { "config", cmd_config, RUN_SETUP_GENTLY },
397 { "count-objects", cmd_count_objects, RUN_SETUP },
398 { "credential", cmd_credential, RUN_SETUP_GENTLY },
399 { "describe", cmd_describe, RUN_SETUP },
400 { "diff", cmd_diff },
401 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
402 { "diff-index", cmd_diff_index, RUN_SETUP },
403 { "diff-tree", cmd_diff_tree, RUN_SETUP },
404 { "fast-export", cmd_fast_export, RUN_SETUP },
405 { "fetch", cmd_fetch, RUN_SETUP },
406 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
407 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
408 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
409 { "format-patch", cmd_format_patch, RUN_SETUP },
410 { "fsck", cmd_fsck, RUN_SETUP },
411 { "fsck-objects", cmd_fsck, RUN_SETUP },
412 { "gc", cmd_gc, RUN_SETUP },
413 { "get-tar-commit-id", cmd_get_tar_commit_id },
414 { "grep", cmd_grep, RUN_SETUP_GENTLY },
415 { "hash-object", cmd_hash_object },
416 { "help", cmd_help },
417 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
c0562611
NTND
418 { "init", cmd_init_db, NO_SETUP },
419 { "init-db", cmd_init_db, NO_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 },
486 { "write-tree", cmd_write_tree, RUN_SETUP },
487};
488
489int is_builtin(const char *s)
490{
491 int i;
492 for (i = 0; i < ARRAY_SIZE(commands); i++) {
493 struct cmd_struct *p = commands+i;
494 if (!strcmp(s, p->cmd))
495 return 1;
496 }
497 return 0;
498}
499
3f784a4d 500static void handle_builtin(int argc, const char **argv)
231af832
LT
501{
502 const char *cmd = argv[0];
231af832 503 int i;
23326d14
JS
504 static const char ext[] = STRIP_EXTENSION;
505
506 if (sizeof(ext) > 1) {
507 i = strlen(argv[0]) - strlen(ext);
508 if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d 509 char *argv0 = xstrdup(argv[0]);
23326d14
JS
510 argv[0] = cmd = argv0;
511 argv0[i] = '\0';
512 }
513 }
231af832 514
1cd95087
LT
515 /* Turn "git cmd --help" into "git help cmd" */
516 if (argc > 1 && !strcmp(argv[1], "--help")) {
517 argv[1] = argv[0];
518 argv[0] = cmd = "help";
519 }
520
231af832
LT
521 for (i = 0; i < ARRAY_SIZE(commands); i++) {
522 struct cmd_struct *p = commands+i;
523 if (strcmp(p->cmd, cmd))
524 continue;
c0562611
NTND
525 if (saved_environment && (p->option & NO_SETUP)) {
526 restore_env();
527 break;
528 }
f172f334 529 exit(run_builtin(p, argc, argv));
231af832
LT
530 }
531}
532
7550be0a
JH
533static void execv_dashed_external(const char **argv)
534{
f285a2d7 535 struct strbuf cmd = STRBUF_INIT;
7550be0a 536 const char *tmp;
d8e96fd8 537 int status;
7550be0a 538
92058e4d
JK
539 if (use_pager == -1)
540 use_pager = check_pager_config(argv[0]);
030149a4
JN
541 commit_pager_choice();
542
7550be0a
JH
543 strbuf_addf(&cmd, "git-%s", argv[0]);
544
545 /*
546 * argv[0] must be the git command, but the argv array
547 * belongs to the caller, and may be reused in
548 * subsequent loop iterations. Save argv[0] and
549 * restore it on error.
550 */
551 tmp = argv[0];
552 argv[0] = cmd.buf;
553
554 trace_argv_printf(argv, "trace: exec:");
555
d8e96fd8
JK
556 /*
557 * if we fail because the command is not found, it is
558 * OK to return. Otherwise, we just pass along the status code.
559 */
10c6cddd 560 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
0ac77ec3 561 if (status >= 0 || errno != ENOENT)
5709e036 562 exit(status);
7550be0a
JH
563
564 argv[0] = tmp;
565
566 strbuf_release(&cmd);
567}
568
a907e1b6
AS
569static int run_argv(int *argcp, const char ***argv)
570{
571 int done_alias = 0;
572
573 while (1) {
3f784a4d
SS
574 /* See if it's a builtin */
575 handle_builtin(*argcp, *argv);
a907e1b6
AS
576
577 /* .. then try the external ones */
578 execv_dashed_external(*argv);
579
580 /* It could be an alias -- this works around the insanity
581 * of overriding "git log" with "git show" by having
582 * alias.log = show
583 */
c0562611
NTND
584 if (done_alias)
585 break;
586 save_env();
587 if (!handle_alias(argcp, argv))
a907e1b6
AS
588 break;
589 done_alias = 1;
590 }
591
592 return done_alias;
593}
594
7550be0a 595
84d32bf7 596int main(int argc, char **av)
8e49d503 597{
84d32bf7 598 const char **argv = (const char **) av;
4dd47c3b 599 const char *cmd;
231af832 600
e37c1329
NTND
601 startup_info = &git_startup_info;
602
2cd72b0b
SP
603 cmd = git_extract_argv0_path(argv[0]);
604 if (!cmd)
4dd47c3b 605 cmd = "git-help";
8e49d503 606
a11c3964
TR
607 /*
608 * Always open file descriptors 0/1/2 to avoid clobbering files
609 * in die(). It also avoids messing up when the pipes are dup'ed
610 * onto stdin/stdout/stderr in the child processes we spawn.
611 */
612 sanitize_stdfds();
613
5e9637c6
ÆAB
614 git_setup_gettext();
615
578da039
KB
616 trace_command_performance(argv);
617
231af832
LT
618 /*
619 * "git-xxxx" is the same as "git xxxx", but we obviously:
620 *
621 * - cannot take flags in between the "git" and the "xxxx".
622 * - cannot execute it externally (since it would just do
623 * the same thing over again)
624 *
3f784a4d
SS
625 * So we just directly call the builtin handler, and die if
626 * that one cannot handle it.
231af832 627 */
ae021d87 628 if (skip_prefix(cmd, "git-", &cmd)) {
231af832 629 argv[0] = cmd;
3f784a4d
SS
630 handle_builtin(argc, argv);
631 die("cannot handle %s as a builtin", cmd);
231af832 632 }
8e49d503 633
231af832 634 /* Look for flags.. */
6acbcb92
JS
635 argv++;
636 argc--;
4394efec 637 handle_options(&argv, &argc, NULL);
6acbcb92 638 if (argc > 0) {
6d877803
JK
639 /* translate --help and --version into commands */
640 skip_prefix(argv[0], "--", &argv[0]);
6acbcb92 641 } else {
3d7e2d85 642 /* The user didn't specify a command; give them help */
73e25e7c 643 commit_pager_choice();
3d7e2d85
SP
644 printf("usage: %s\n\n", git_usage_string);
645 list_common_cmds_help();
421a9769 646 printf("\n%s\n", _(git_more_info_string));
3d7e2d85 647 exit(1);
97fc6c5f 648 }
6acbcb92 649 cmd = argv[0];
231af832
LT
650
651 /*
511707d4 652 * We use PATH to find git commands, but we prepend some higher
3ea3c215 653 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4
SP
654 * environment, and the $(gitexecdir) from the Makefile at build
655 * time.
231af832 656 */
e1464ca7 657 setup_path();
8e49d503 658
a025463b 659 while (1) {
a907e1b6
AS
660 static int done_help = 0;
661 static int was_alias = 0;
662 was_alias = run_argv(&argc, &argv);
663 if (errno != ENOENT)
a025463b 664 break;
a907e1b6 665 if (was_alias) {
f3dd015c 666 fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7 667 "'%s' is not a git command\n",
f3dd015c
TT
668 cmd, argv[0]);
669 exit(1);
670 }
a907e1b6
AS
671 if (!done_help) {
672 cmd = argv[0] = help_unknown_cmd(cmd);
673 done_help = 1;
674 } else
675 break;
f3dd015c 676 }
10b15b86
AR
677
678 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 679 cmd, strerror(errno));
8e49d503
AE
680
681 return 1;
682}