1#include "builtin.h"
2#include "cache.h"
3#include "exec_cmd.h"
4#include "help.h"
5#include "quote.h"
6#include "run-command.h"
7const char git_usage_string[] =
9 "git [--version] [--exec-path[=<path>]] [--html-path]\n"
10 " [-p|--paginate|--no-pager] [--no-replace-objects]\n"
11 " [--bare] [--git-dir=<path>] [--work-tree=<path>]\n"
12 " [-c name=value] [--help]\n"
13 " <command> [<args>]";
14const char git_more_info_string[] =
16 "See 'git help <command>' for more information on a specific command.";
17static struct startup_info git_startup_info;
19static int use_pager = -1;
20struct pager_config {
21 const char *cmd;
22 int val;
23};
24static int pager_command_config(const char *var, const char *value, void *data)
26{
27 struct pager_config *c = data;
28 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
29 c->val = git_config_bool(var, value);
30 return 0;
31}
32/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
34int check_pager_config(const char *cmd)
35{
36 struct pager_config c;
37 c.cmd = cmd;
38 c.val = -1;
39 git_config(pager_command_config, &c);
40 return c.val;
41}
42static void commit_pager_choice(void) {
44 switch (use_pager) {
45 case 0:
46 setenv("GIT_PAGER", "cat", 1);
47 break;
48 case 1:
49 setup_pager();
50 break;
51 default:
52 break;
53 }
54}
55static int handle_options(const char ***argv, int *argc, int *envchanged)
57{
58 int handled = 0;
59 while (*argc > 0) {
61 const char *cmd = (*argv)[0];
62 if (cmd[0] != '-')
63 break;
64 /*
66 * For legacy reasons, the "version" and "help"
67 * commands can be written with "--" prepended
68 * to make them look like flags.
69 */
70 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
71 break;
72 /*
74 * Check remaining flags.
75 */
76 if (!prefixcmp(cmd, "--exec-path")) {
77 cmd += 11;
78 if (*cmd == '=')
79 git_set_argv_exec_path(cmd + 1);
80 else {
81 puts(git_exec_path());
82 exit(0);
83 }
84 } else if (!strcmp(cmd, "--html-path")) {
85 puts(system_path(GIT_HTML_PATH));
86 exit(0);
87 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
88 use_pager = 1;
89 } else if (!strcmp(cmd, "--no-pager")) {
90 use_pager = 0;
91 if (envchanged)
92 *envchanged = 1;
93 } else if (!strcmp(cmd, "--no-replace-objects")) {
94 read_replace_refs = 0;
95 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
96 if (envchanged)
97 *envchanged = 1;
98 } else if (!strcmp(cmd, "--git-dir")) {
99 if (*argc < 2) {
100 fprintf(stderr, "No directory given for --git-dir.\n" );
101 usage(git_usage_string);
102 }
103 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
104 if (envchanged)
105 *envchanged = 1;
106 (*argv)++;
107 (*argc)--;
108 handled++;
109 } else if (!prefixcmp(cmd, "--git-dir=")) {
110 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
111 if (envchanged)
112 *envchanged = 1;
113 } else if (!strcmp(cmd, "--work-tree")) {
114 if (*argc < 2) {
115 fprintf(stderr, "No directory given for --work-tree.\n" );
116 usage(git_usage_string);
117 }
118 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
119 if (envchanged)
120 *envchanged = 1;
121 (*argv)++;
122 (*argc)--;
123 } else if (!prefixcmp(cmd, "--work-tree=")) {
124 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
125 if (envchanged)
126 *envchanged = 1;
127 } else if (!strcmp(cmd, "--bare")) {
128 static char git_dir[PATH_MAX+1];
129 is_bare_repository_cfg = 1;
130 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
131 if (envchanged)
132 *envchanged = 1;
133 } else if (!strcmp(cmd, "-c")) {
134 if (*argc < 2) {
135 fprintf(stderr, "-c expects a configuration string\n" );
136 usage(git_usage_string);
137 }
138 git_config_push_parameter((*argv)[1]);
139 (*argv)++;
140 (*argc)--;
141 } else {
142 fprintf(stderr, "Unknown option: %s\n", cmd);
143 usage(git_usage_string);
144 }
145 (*argv)++;
147 (*argc)--;
148 handled++;
149 }
150 return handled;
151}
152static int handle_alias(int *argcp, const char ***argv)
154{
155 int envchanged = 0, ret = 0, saved_errno = errno;
156 const char *subdir;
157 int count, option_count;
158 const char **new_argv;
159 const char *alias_command;
160 char *alias_string;
161 int unused_nongit;
162 subdir = setup_git_directory_gently(&unused_nongit);
164 alias_command = (*argv)[0];
166 alias_string = alias_lookup(alias_command);
167 if (alias_string) {
168 if (alias_string[0] == '!') {
169 commit_pager_choice();
170 if (*argcp > 1) {
171 struct strbuf buf;
172 strbuf_init(&buf, PATH_MAX);
174 strbuf_addstr(&buf, alias_string);
175 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
176 free(alias_string);
177 alias_string = buf.buf;
178 }
179 trace_printf("trace: alias to shell cmd: %s => %s\n",
180 alias_command, alias_string + 1);
181 ret = system(alias_string + 1);
182 if (ret >= 0 && WIFEXITED(ret) &&
183 WEXITSTATUS(ret) != 127)
184 exit(WEXITSTATUS(ret));
185 die("Failed to run '%s' when expanding alias '%s'",
186 alias_string + 1, alias_command);
187 }
188 count = split_cmdline(alias_string, &new_argv);
189 if (count < 0)
190 die("Bad alias.%s string: %s", alias_command,
191 split_cmdline_strerror(count));
192 option_count = handle_options(&new_argv, &count, &envchanged);
193 if (envchanged)
194 die("alias '%s' changes environment variables\n"
195 "You can use '!git' in the alias to do this.",
196 alias_command);
197 memmove(new_argv - option_count, new_argv,
198 count * sizeof(char *));
199 new_argv -= option_count;
200 if (count < 1)
202 die("empty alias for %s", alias_command);
203 if (!strcmp(alias_command, new_argv[0]))
205 die("recursive alias: %s", alias_command);
206 trace_argv_printf(new_argv,
208 "trace: alias expansion: %s =>",
209 alias_command);
210 new_argv = xrealloc(new_argv, sizeof(char *) *
212 (count + *argcp));
213 /* insert after command name */
214 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
215 *argv = new_argv;
217 *argcp += count - 1;
218 ret = 1;
220 }
221 if (subdir && chdir(subdir))
223 die_errno("Cannot change to '%s'", subdir);
224 errno = saved_errno;
226 return ret;
228}
229const char git_version_string[] = GIT_VERSION;
231#define RUN_SETUP (1<<0)
233#define RUN_SETUP_GENTLY (1<<1)
234#define USE_PAGER (1<<2)
235/*
236 * require working tree to be present -- anything uses this needs
237 * RUN_SETUP for reading from the configuration file.
238 */
239#define NEED_WORK_TREE (1<<3)
240struct cmd_struct {
242 const char *cmd;
243 int (*fn)(int, const char **, const char *);
244 int option;
245};
246static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
248{
249 int status, help;
250 struct stat st;
251 const char *prefix;
252 prefix = NULL;
254 help = argc == 2 && !strcmp(argv[1], "-h");
255 if (!help) {
256 if (p->option & RUN_SETUP)
257 prefix = setup_git_directory();
258 if (p->option & RUN_SETUP_GENTLY) {
259 int nongit_ok;
260 prefix = setup_git_directory_gently(&nongit_ok);
261 }
262 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
264 use_pager = check_pager_config(p->cmd);
265 if (use_pager == -1 && p->option & USE_PAGER)
266 use_pager = 1;
267 }
268 commit_pager_choice();
269 if (!help && p->option & NEED_WORK_TREE)
271 setup_work_tree();
272 trace_argv_printf(argv, "trace: built-in: git");
274 status = p->fn(argc, argv, prefix);
276 if (status)
277 return status;
278 /* Somebody closed stdout? */
280 if (fstat(fileno(stdout), &st))
281 return 0;
282 /* Ignore write errors for pipes and sockets.. */
283 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
284 return 0;
285 /* Check for ENOSPC and EIO errors.. */
287 if (fflush(stdout))
288 die_errno("write failure on standard output");
289 if (ferror(stdout))
290 die("unknown write failure on standard output");
291 if (fclose(stdout))
292 die_errno("close failed on standard output");
293 return 0;
294}
295static void handle_internal_command(int argc, const char **argv)
297{
298 const char *cmd = argv[0];
299 static struct cmd_struct commands[] = {
300 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
301 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
302 { "annotate", cmd_annotate, RUN_SETUP },
303 { "apply", cmd_apply, RUN_SETUP_GENTLY },
304 { "archive", cmd_archive },
305 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
306 { "blame", cmd_blame, RUN_SETUP },
307 { "branch", cmd_branch, RUN_SETUP },
308 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
309 { "cat-file", cmd_cat_file, RUN_SETUP },
310 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
311 { "checkout-index", cmd_checkout_index,
312 RUN_SETUP | NEED_WORK_TREE},
313 { "check-ref-format", cmd_check_ref_format },
314 { "check-attr", cmd_check_attr, RUN_SETUP },
315 { "cherry", cmd_cherry, RUN_SETUP },
316 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
317 { "clone", cmd_clone },
318 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
319 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
320 { "commit-tree", cmd_commit_tree, RUN_SETUP },
321 { "config", cmd_config, RUN_SETUP_GENTLY },
322 { "count-objects", cmd_count_objects, RUN_SETUP },
323 { "describe", cmd_describe, RUN_SETUP },
324 { "diff", cmd_diff },
325 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
326 { "diff-index", cmd_diff_index, RUN_SETUP },
327 { "diff-tree", cmd_diff_tree, RUN_SETUP },
328 { "fast-export", cmd_fast_export, RUN_SETUP },
329 { "fetch", cmd_fetch, RUN_SETUP },
330 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
331 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
332 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
333 { "format-patch", cmd_format_patch, RUN_SETUP },
334 { "fsck", cmd_fsck, RUN_SETUP },
335 { "fsck-objects", cmd_fsck, RUN_SETUP },
336 { "gc", cmd_gc, RUN_SETUP },
337 { "get-tar-commit-id", cmd_get_tar_commit_id },
338 { "grep", cmd_grep, RUN_SETUP_GENTLY },
339 { "hash-object", cmd_hash_object },
340 { "help", cmd_help },
341 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
342 { "init", cmd_init_db },
343 { "init-db", cmd_init_db },
344 { "log", cmd_log, RUN_SETUP },
345 { "ls-files", cmd_ls_files, RUN_SETUP },
346 { "ls-tree", cmd_ls_tree, RUN_SETUP },
347 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
348 { "mailinfo", cmd_mailinfo },
349 { "mailsplit", cmd_mailsplit },
350 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
351 { "merge-base", cmd_merge_base, RUN_SETUP },
352 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
353 { "merge-index", cmd_merge_index, RUN_SETUP },
354 { "merge-ours", cmd_merge_ours, RUN_SETUP },
355 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
356 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
357 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
358 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
359 { "merge-tree", cmd_merge_tree, RUN_SETUP },
360 { "mktag", cmd_mktag, RUN_SETUP },
361 { "mktree", cmd_mktree, RUN_SETUP },
362 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
363 { "name-rev", cmd_name_rev, RUN_SETUP },
364 { "notes", cmd_notes, RUN_SETUP },
365 { "pack-objects", cmd_pack_objects, RUN_SETUP },
366 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
367 { "patch-id", cmd_patch_id },
368 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
369 { "pickaxe", cmd_blame, RUN_SETUP },
370 { "prune", cmd_prune, RUN_SETUP },
371 { "prune-packed", cmd_prune_packed, RUN_SETUP },
372 { "push", cmd_push, RUN_SETUP },
373 { "read-tree", cmd_read_tree, RUN_SETUP },
374 { "receive-pack", cmd_receive_pack },
375 { "reflog", cmd_reflog, RUN_SETUP },
376 { "remote", cmd_remote, RUN_SETUP },
377 { "replace", cmd_replace, RUN_SETUP },
378 { "repo-config", cmd_config, RUN_SETUP_GENTLY },
379 { "rerere", cmd_rerere, RUN_SETUP },
380 { "reset", cmd_reset, RUN_SETUP },
381 { "rev-list", cmd_rev_list, RUN_SETUP },
382 { "rev-parse", cmd_rev_parse },
383 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
384 { "rm", cmd_rm, RUN_SETUP },
385 { "send-pack", cmd_send_pack, RUN_SETUP },
386 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
387 { "show-branch", cmd_show_branch, RUN_SETUP },
388 { "show", cmd_show, RUN_SETUP },
389 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
390 { "stripspace", cmd_stripspace },
391 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
392 { "tag", cmd_tag, RUN_SETUP },
393 { "tar-tree", cmd_tar_tree },
394 { "unpack-file", cmd_unpack_file, RUN_SETUP },
395 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
396 { "update-index", cmd_update_index, RUN_SETUP },
397 { "update-ref", cmd_update_ref, RUN_SETUP },
398 { "update-server-info", cmd_update_server_info, RUN_SETUP },
399 { "upload-archive", cmd_upload_archive },
400 { "var", cmd_var, RUN_SETUP_GENTLY },
401 { "verify-tag", cmd_verify_tag, RUN_SETUP },
402 { "version", cmd_version },
403 { "whatchanged", cmd_whatchanged, RUN_SETUP },
404 { "write-tree", cmd_write_tree, RUN_SETUP },
405 { "verify-pack", cmd_verify_pack },
406 { "show-ref", cmd_show_ref, RUN_SETUP },
407 { "pack-refs", cmd_pack_refs, RUN_SETUP },
408 };
409 int i;
410 static const char ext[] = STRIP_EXTENSION;
411 if (sizeof(ext) > 1) {
413 i = strlen(argv[0]) - strlen(ext);
414 if (i > 0 && !strcmp(argv[0] + i, ext)) {
415 char *argv0 = xstrdup(argv[0]);
416 argv[0] = cmd = argv0;
417 argv0[i] = '\0';
418 }
419 }
420 /* Turn "git cmd --help" into "git help cmd" */
422 if (argc > 1 && !strcmp(argv[1], "--help")) {
423 argv[1] = argv[0];
424 argv[0] = cmd = "help";
425 }
426 for (i = 0; i < ARRAY_SIZE(commands); i++) {
428 struct cmd_struct *p = commands+i;
429 if (strcmp(p->cmd, cmd))
430 continue;
431 exit(run_builtin(p, argc, argv));
432 }
433}
434static void execv_dashed_external(const char **argv)
436{
437 struct strbuf cmd = STRBUF_INIT;
438 const char *tmp;
439 int status;
440 commit_pager_choice();
442 strbuf_addf(&cmd, "git-%s", argv[0]);
444 /*
446 * argv[0] must be the git command, but the argv array
447 * belongs to the caller, and may be reused in
448 * subsequent loop iterations. Save argv[0] and
449 * restore it on error.
450 */
451 tmp = argv[0];
452 argv[0] = cmd.buf;
453 trace_argv_printf(argv, "trace: exec:");
455 /*
457 * if we fail because the command is not found, it is
458 * OK to return. Otherwise, we just pass along the status code.
459 */
460 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
461 if (status >= 0 || errno != ENOENT)
462 exit(status);
463 argv[0] = tmp;
465 strbuf_release(&cmd);
467}
468static int run_argv(int *argcp, const char ***argv)
470{
471 int done_alias = 0;
472 while (1) {
474 /* See if it's an internal command */
475 handle_internal_command(*argcp, *argv);
476 /* .. then try the external ones */
478 execv_dashed_external(*argv);
479 /* It could be an alias -- this works around the insanity
481 * of overriding "git log" with "git show" by having
482 * alias.log = show
483 */
484 if (done_alias || !handle_alias(argcp, argv))
485 break;
486 done_alias = 1;
487 }
488 return done_alias;
490}
491int main(int argc, const char **argv)
494{
495 const char *cmd;
496 startup_info = &git_startup_info;
498 cmd = git_extract_argv0_path(argv[0]);
500 if (!cmd)
501 cmd = "git-help";
502 /*
504 * "git-xxxx" is the same as "git xxxx", but we obviously:
505 *
506 * - cannot take flags in between the "git" and the "xxxx".
507 * - cannot execute it externally (since it would just do
508 * the same thing over again)
509 *
510 * So we just directly call the internal command handler, and
511 * die if that one cannot handle it.
512 */
513 if (!prefixcmp(cmd, "git-")) {
514 cmd += 4;
515 argv[0] = cmd;
516 handle_internal_command(argc, argv);
517 die("cannot handle %s internally", cmd);
518 }
519 /* Look for flags.. */
521 argv++;
522 argc--;
523 handle_options(&argv, &argc, NULL);
524 if (argc > 0) {
525 if (!prefixcmp(argv[0], "--"))
526 argv[0] += 2;
527 } else {
528 /* The user didn't specify a command; give them help */
529 commit_pager_choice();
530 printf("usage: %s\n\n", git_usage_string);
531 list_common_cmds_help();
532 printf("\n%s\n", git_more_info_string);
533 exit(1);
534 }
535 cmd = argv[0];
536 /*
538 * We use PATH to find git commands, but we prepend some higher
539 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
540 * environment, and the $(gitexecdir) from the Makefile at build
541 * time.
542 */
543 setup_path();
544 while (1) {
546 static int done_help = 0;
547 static int was_alias = 0;
548 was_alias = run_argv(&argc, &argv);
549 if (errno != ENOENT)
550 break;
551 if (was_alias) {
552 fprintf(stderr, "Expansion of alias '%s' failed; "
553 "'%s' is not a git command\n",
554 cmd, argv[0]);
555 exit(1);
556 }
557 if (!done_help) {
558 cmd = argv[0] = help_unknown_cmd(cmd);
559 done_help = 1;
560 } else
561 break;
562 }
563 fprintf(stderr, "Failed to run command '%s': %s\n",
565 cmd, strerror(errno));
566 return 1;
568}