1#include "builtin.h"
2#include "exec_cmd.h"
3#include "cache.h"
4#include "quote.h"
5#include "run-command.h"
6const char git_usage_string[] =
8 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
9 " [-p|--paginate|--no-pager]\n"
10 " [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
11 " [--help] COMMAND [ARGS]";
12const char git_more_info_string[] =
14 "See 'git help COMMAND' for more information on a specific command.";
15static int use_pager = -1;
17struct pager_config {
18 const char *cmd;
19 int val;
20};
21static int pager_command_config(const char *var, const char *value, void *data)
23{
24 struct pager_config *c = data;
25 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
26 c->val = git_config_bool(var, value);
27 return 0;
28}
29/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
31int check_pager_config(const char *cmd)
32{
33 struct pager_config c;
34 c.cmd = cmd;
35 c.val = -1;
36 git_config(pager_command_config, &c);
37 return c.val;
38}
39static void commit_pager_choice(void) {
41 switch (use_pager) {
42 case 0:
43 setenv("GIT_PAGER", "cat", 1);
44 break;
45 case 1:
46 setup_pager();
47 break;
48 default:
49 break;
50 }
51}
52static int handle_options(const char ***argv, int *argc, int *envchanged)
54{
55 int handled = 0;
56 while (*argc > 0) {
58 const char *cmd = (*argv)[0];
59 if (cmd[0] != '-')
60 break;
61 /*
63 * For legacy reasons, the "version" and "help"
64 * commands can be written with "--" prepended
65 * to make them look like flags.
66 */
67 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
68 break;
69 /*
71 * Check remaining flags.
72 */
73 if (!prefixcmp(cmd, "--exec-path")) {
74 cmd += 11;
75 if (*cmd == '=')
76 git_set_argv_exec_path(cmd + 1);
77 else {
78 puts(git_exec_path());
79 exit(0);
80 }
81 } else if (!strcmp(cmd, "--html-path")) {
82 puts(system_path(GIT_HTML_PATH));
83 exit(0);
84 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
85 use_pager = 1;
86 } else if (!strcmp(cmd, "--no-pager")) {
87 use_pager = 0;
88 if (envchanged)
89 *envchanged = 1;
90 } else if (!strcmp(cmd, "--git-dir")) {
91 if (*argc < 2) {
92 fprintf(stderr, "No directory given for --git-dir.\n" );
93 usage(git_usage_string);
94 }
95 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
96 if (envchanged)
97 *envchanged = 1;
98 (*argv)++;
99 (*argc)--;
100 handled++;
101 } else if (!prefixcmp(cmd, "--git-dir=")) {
102 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
103 if (envchanged)
104 *envchanged = 1;
105 } else if (!strcmp(cmd, "--work-tree")) {
106 if (*argc < 2) {
107 fprintf(stderr, "No directory given for --work-tree.\n" );
108 usage(git_usage_string);
109 }
110 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
111 if (envchanged)
112 *envchanged = 1;
113 (*argv)++;
114 (*argc)--;
115 } else if (!prefixcmp(cmd, "--work-tree=")) {
116 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
117 if (envchanged)
118 *envchanged = 1;
119 } else if (!strcmp(cmd, "--bare")) {
120 static char git_dir[PATH_MAX+1];
121 is_bare_repository_cfg = 1;
122 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
123 if (envchanged)
124 *envchanged = 1;
125 } else {
126 fprintf(stderr, "Unknown option: %s\n", cmd);
127 usage(git_usage_string);
128 }
129 (*argv)++;
131 (*argc)--;
132 handled++;
133 }
134 return handled;
135}
136static int handle_alias(int *argcp, const char ***argv)
138{
139 int envchanged = 0, ret = 0, saved_errno = errno;
140 const char *subdir;
141 int count, option_count;
142 const char **new_argv;
143 const char *alias_command;
144 char *alias_string;
145 int unused_nongit;
146 subdir = setup_git_directory_gently(&unused_nongit);
148 alias_command = (*argv)[0];
150 alias_string = alias_lookup(alias_command);
151 if (alias_string) {
152 if (alias_string[0] == '!') {
153 if (*argcp > 1) {
154 struct strbuf buf;
155 strbuf_init(&buf, PATH_MAX);
157 strbuf_addstr(&buf, alias_string);
158 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
159 free(alias_string);
160 alias_string = buf.buf;
161 }
162 trace_printf("trace: alias to shell cmd: %s => %s\n",
163 alias_command, alias_string + 1);
164 ret = system(alias_string + 1);
165 if (ret >= 0 && WIFEXITED(ret) &&
166 WEXITSTATUS(ret) != 127)
167 exit(WEXITSTATUS(ret));
168 die("Failed to run '%s' when expanding alias '%s'",
169 alias_string + 1, alias_command);
170 }
171 count = split_cmdline(alias_string, &new_argv);
172 if (count < 0)
173 die("Bad alias.%s string", alias_command);
174 option_count = handle_options(&new_argv, &count, &envchanged);
175 if (envchanged)
176 die("alias '%s' changes environment variables\n"
177 "You can use '!git' in the alias to do this.",
178 alias_command);
179 memmove(new_argv - option_count, new_argv,
180 count * sizeof(char *));
181 new_argv -= option_count;
182 if (count < 1)
184 die("empty alias for %s", alias_command);
185 if (!strcmp(alias_command, new_argv[0]))
187 die("recursive alias: %s", alias_command);
188 trace_argv_printf(new_argv,
190 "trace: alias expansion: %s =>",
191 alias_command);
192 new_argv = xrealloc(new_argv, sizeof(char *) *
194 (count + *argcp));
195 /* insert after command name */
196 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
197 *argv = new_argv;
199 *argcp += count - 1;
200 ret = 1;
202 }
203 if (subdir && chdir(subdir))
205 die_errno("Cannot change to '%s'", subdir);
206 errno = saved_errno;
208 return ret;
210}
211const char git_version_string[] = GIT_VERSION;
213#define RUN_SETUP (1<<0)
215#define USE_PAGER (1<<1)
216/*
217 * require working tree to be present -- anything uses this needs
218 * RUN_SETUP for reading from the configuration file.
219 */
220#define NEED_WORK_TREE (1<<2)
221struct cmd_struct {
223 const char *cmd;
224 int (*fn)(int, const char **, const char *);
225 int option;
226};
227static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
229{
230 int status;
231 struct stat st;
232 const char *prefix;
233 prefix = NULL;
235 if (p->option & RUN_SETUP)
236 prefix = setup_git_directory();
237 if (use_pager == -1 && p->option & RUN_SETUP)
239 use_pager = check_pager_config(p->cmd);
240 if (use_pager == -1 && p->option & USE_PAGER)
241 use_pager = 1;
242 commit_pager_choice();
243 if (p->option & NEED_WORK_TREE)
245 setup_work_tree();
246 trace_argv_printf(argv, "trace: built-in: git");
248 status = p->fn(argc, argv, prefix);
250 if (status)
251 return status;
252 /* Somebody closed stdout? */
254 if (fstat(fileno(stdout), &st))
255 return 0;
256 /* Ignore write errors for pipes and sockets.. */
257 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
258 return 0;
259 /* Check for ENOSPC and EIO errors.. */
261 if (fflush(stdout))
262 die_errno("write failure on standard output");
263 if (ferror(stdout))
264 die("unknown write failure on standard output");
265 if (fclose(stdout))
266 die_errno("close failed on standard output");
267 return 0;
268}
269static void handle_internal_command(int argc, const char **argv)
271{
272 const char *cmd = argv[0];
273 static struct cmd_struct commands[] = {
274 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
275 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
276 { "annotate", cmd_annotate, RUN_SETUP },
277 { "apply", cmd_apply },
278 { "archive", cmd_archive },
279 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
280 { "blame", cmd_blame, RUN_SETUP },
281 { "branch", cmd_branch, RUN_SETUP },
282 { "bundle", cmd_bundle },
283 { "cat-file", cmd_cat_file, RUN_SETUP },
284 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
285 { "checkout-index", cmd_checkout_index,
286 RUN_SETUP | NEED_WORK_TREE},
287 { "check-ref-format", cmd_check_ref_format },
288 { "check-attr", cmd_check_attr, RUN_SETUP },
289 { "cherry", cmd_cherry, RUN_SETUP },
290 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
291 { "clone", cmd_clone },
292 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
293 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
294 { "commit-tree", cmd_commit_tree, RUN_SETUP },
295 { "config", cmd_config },
296 { "count-objects", cmd_count_objects, RUN_SETUP },
297 { "describe", cmd_describe, RUN_SETUP },
298 { "diff", cmd_diff },
299 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
300 { "diff-index", cmd_diff_index, RUN_SETUP },
301 { "diff-tree", cmd_diff_tree, RUN_SETUP },
302 { "fast-export", cmd_fast_export, RUN_SETUP },
303 { "fetch", cmd_fetch, RUN_SETUP },
304 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
305 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
306 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
307 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
308 { "format-patch", cmd_format_patch, RUN_SETUP },
309 { "fsck", cmd_fsck, RUN_SETUP },
310 { "fsck-objects", cmd_fsck, RUN_SETUP },
311 { "gc", cmd_gc, RUN_SETUP },
312 { "get-tar-commit-id", cmd_get_tar_commit_id },
313 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
314 { "help", cmd_help },
315 { "init", cmd_init_db },
316 { "init-db", cmd_init_db },
317 { "log", cmd_log, RUN_SETUP | USE_PAGER },
318 { "ls-files", cmd_ls_files, RUN_SETUP },
319 { "ls-tree", cmd_ls_tree, RUN_SETUP },
320 { "ls-remote", cmd_ls_remote },
321 { "mailinfo", cmd_mailinfo },
322 { "mailsplit", cmd_mailsplit },
323 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
324 { "merge-base", cmd_merge_base, RUN_SETUP },
325 { "merge-file", cmd_merge_file },
326 { "merge-ours", cmd_merge_ours, RUN_SETUP },
327 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
328 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
329 { "mktree", cmd_mktree, RUN_SETUP },
330 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
331 { "name-rev", cmd_name_rev, RUN_SETUP },
332 { "pack-objects", cmd_pack_objects, RUN_SETUP },
333 { "peek-remote", cmd_ls_remote },
334 { "pickaxe", cmd_blame, RUN_SETUP },
335 { "prune", cmd_prune, RUN_SETUP },
336 { "prune-packed", cmd_prune_packed, RUN_SETUP },
337 { "push", cmd_push, RUN_SETUP },
338 { "read-tree", cmd_read_tree, RUN_SETUP },
339 { "receive-pack", cmd_receive_pack },
340 { "reflog", cmd_reflog, RUN_SETUP },
341 { "remote", cmd_remote, RUN_SETUP },
342 { "replace", cmd_replace, RUN_SETUP },
343 { "repo-config", cmd_config },
344 { "rerere", cmd_rerere, RUN_SETUP },
345 { "reset", cmd_reset, RUN_SETUP },
346 { "rev-list", cmd_rev_list, RUN_SETUP },
347 { "rev-parse", cmd_rev_parse },
348 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
349 { "rm", cmd_rm, RUN_SETUP },
350 { "send-pack", cmd_send_pack, RUN_SETUP },
351 { "shortlog", cmd_shortlog, USE_PAGER },
352 { "show-branch", cmd_show_branch, RUN_SETUP },
353 { "show", cmd_show, RUN_SETUP | USE_PAGER },
354 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
355 { "stripspace", cmd_stripspace },
356 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
357 { "tag", cmd_tag, RUN_SETUP },
358 { "tar-tree", cmd_tar_tree },
359 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
360 { "update-index", cmd_update_index, RUN_SETUP },
361 { "update-ref", cmd_update_ref, RUN_SETUP },
362 { "update-server-info", cmd_update_server_info, RUN_SETUP },
363 { "upload-archive", cmd_upload_archive },
364 { "verify-tag", cmd_verify_tag, RUN_SETUP },
365 { "version", cmd_version },
366 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
367 { "write-tree", cmd_write_tree, RUN_SETUP },
368 { "verify-pack", cmd_verify_pack },
369 { "show-ref", cmd_show_ref, RUN_SETUP },
370 { "pack-refs", cmd_pack_refs, RUN_SETUP },
371 };
372 int i;
373 static const char ext[] = STRIP_EXTENSION;
374 if (sizeof(ext) > 1) {
376 i = strlen(argv[0]) - strlen(ext);
377 if (i > 0 && !strcmp(argv[0] + i, ext)) {
378 char *argv0 = xstrdup(argv[0]);
379 argv[0] = cmd = argv0;
380 argv0[i] = '\0';
381 }
382 }
383 /* Turn "git cmd --help" into "git help cmd" */
385 if (argc > 1 && !strcmp(argv[1], "--help")) {
386 argv[1] = argv[0];
387 argv[0] = cmd = "help";
388 }
389 for (i = 0; i < ARRAY_SIZE(commands); i++) {
391 struct cmd_struct *p = commands+i;
392 if (strcmp(p->cmd, cmd))
393 continue;
394 exit(run_builtin(p, argc, argv));
395 }
396}
397static void execv_dashed_external(const char **argv)
399{
400 struct strbuf cmd = STRBUF_INIT;
401 const char *tmp;
402 int status;
403 strbuf_addf(&cmd, "git-%s", argv[0]);
405 /*
407 * argv[0] must be the git command, but the argv array
408 * belongs to the caller, and may be reused in
409 * subsequent loop iterations. Save argv[0] and
410 * restore it on error.
411 */
412 tmp = argv[0];
413 argv[0] = cmd.buf;
414 trace_argv_printf(argv, "trace: exec:");
416 /*
418 * if we fail because the command is not found, it is
419 * OK to return. Otherwise, we just pass along the status code.
420 */
421 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
422 if (status >= 0 || errno != ENOENT)
423 exit(status);
424 argv[0] = tmp;
426 strbuf_release(&cmd);
428}
429static int run_argv(int *argcp, const char ***argv)
431{
432 int done_alias = 0;
433 while (1) {
435 /* See if it's an internal command */
436 handle_internal_command(*argcp, *argv);
437 /* .. then try the external ones */
439 execv_dashed_external(*argv);
440 /* It could be an alias -- this works around the insanity
442 * of overriding "git log" with "git show" by having
443 * alias.log = show
444 */
445 if (done_alias || !handle_alias(argcp, argv))
446 break;
447 done_alias = 1;
448 }
449 return done_alias;
451}
452int main(int argc, const char **argv)
455{
456 const char *cmd;
457 cmd = git_extract_argv0_path(argv[0]);
459 if (!cmd)
460 cmd = "git-help";
461 /*
463 * "git-xxxx" is the same as "git xxxx", but we obviously:
464 *
465 * - cannot take flags in between the "git" and the "xxxx".
466 * - cannot execute it externally (since it would just do
467 * the same thing over again)
468 *
469 * So we just directly call the internal command handler, and
470 * die if that one cannot handle it.
471 */
472 if (!prefixcmp(cmd, "git-")) {
473 cmd += 4;
474 argv[0] = cmd;
475 handle_internal_command(argc, argv);
476 die("cannot handle %s internally", cmd);
477 }
478 /* Look for flags.. */
480 argv++;
481 argc--;
482 handle_options(&argv, &argc, NULL);
483 commit_pager_choice();
484 if (argc > 0) {
485 if (!prefixcmp(argv[0], "--"))
486 argv[0] += 2;
487 } else {
488 /* The user didn't specify a command; give them help */
489 printf("usage: %s\n\n", git_usage_string);
490 list_common_cmds_help();
491 printf("\n%s\n", git_more_info_string);
492 exit(1);
493 }
494 cmd = argv[0];
495 /*
497 * We use PATH to find git commands, but we prepend some higher
498 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
499 * environment, and the $(gitexecdir) from the Makefile at build
500 * time.
501 */
502 setup_path();
503 while (1) {
505 static int done_help = 0;
506 static int was_alias = 0;
507 was_alias = run_argv(&argc, &argv);
508 if (errno != ENOENT)
509 break;
510 if (was_alias) {
511 fprintf(stderr, "Expansion of alias '%s' failed; "
512 "'%s' is not a git-command\n",
513 cmd, argv[0]);
514 exit(1);
515 }
516 if (!done_help) {
517 cmd = argv[0] = help_unknown_cmd(cmd);
518 done_help = 1;
519 } else
520 break;
521 }
522 fprintf(stderr, "Failed to run command '%s': %s\n",
524 cmd, strerror(errno));
525 return 1;
527}