Merge commit 'git/master'
[git/git-bigfiles.git] / git.c
blobc2b181ed78daa4510f5cfb7bbff5b78f449f872a
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5 #include "run-command.h"
7 const char git_usage_string[] =
8 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
10 const char git_more_info_string[] =
11 "See 'git help COMMAND' for more information on a specific command.";
13 static int use_pager = -1;
14 struct pager_config {
15 const char *cmd;
16 int val;
19 static int pager_command_config(const char *var, const char *value, void *data)
21 struct pager_config *c = data;
22 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
23 c->val = git_config_bool(var, value);
24 return 0;
27 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
28 int check_pager_config(const char *cmd)
30 struct pager_config c;
31 c.cmd = cmd;
32 c.val = -1;
33 git_config(pager_command_config, &c);
34 return c.val;
37 static void commit_pager_choice(void) {
38 switch (use_pager) {
39 case 0:
40 setenv("GIT_PAGER", "cat", 1);
41 break;
42 case 1:
43 setup_pager();
44 break;
45 default:
46 break;
50 static int handle_options(const char*** argv, int* argc, int* envchanged)
52 int handled = 0;
54 while (*argc > 0) {
55 const char *cmd = (*argv)[0];
56 if (cmd[0] != '-')
57 break;
60 * For legacy reasons, the "version" and "help"
61 * commands can be written with "--" prepended
62 * to make them look like flags.
64 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
65 break;
68 * Check remaining flags.
70 if (!prefixcmp(cmd, "--exec-path")) {
71 cmd += 11;
72 if (*cmd == '=')
73 git_set_argv_exec_path(cmd + 1);
74 else {
75 puts(git_exec_path());
76 exit(0);
78 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
79 use_pager = 1;
80 } else if (!strcmp(cmd, "--no-pager")) {
81 use_pager = 0;
82 if (envchanged)
83 *envchanged = 1;
84 } else if (!strcmp(cmd, "--git-dir")) {
85 if (*argc < 2) {
86 fprintf(stderr, "No directory given for --git-dir.\n" );
87 usage(git_usage_string);
89 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
90 if (envchanged)
91 *envchanged = 1;
92 (*argv)++;
93 (*argc)--;
94 handled++;
95 } else if (!prefixcmp(cmd, "--git-dir=")) {
96 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
97 if (envchanged)
98 *envchanged = 1;
99 } else if (!strcmp(cmd, "--work-tree")) {
100 if (*argc < 2) {
101 fprintf(stderr, "No directory given for --work-tree.\n" );
102 usage(git_usage_string);
104 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
105 if (envchanged)
106 *envchanged = 1;
107 (*argv)++;
108 (*argc)--;
109 } else if (!prefixcmp(cmd, "--work-tree=")) {
110 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
111 if (envchanged)
112 *envchanged = 1;
113 } else if (!strcmp(cmd, "--bare")) {
114 static char git_dir[PATH_MAX+1];
115 is_bare_repository_cfg = 1;
116 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
117 if (envchanged)
118 *envchanged = 1;
119 } else {
120 fprintf(stderr, "Unknown option: %s\n", cmd);
121 usage(git_usage_string);
124 (*argv)++;
125 (*argc)--;
126 handled++;
128 return handled;
131 static int handle_alias(int *argcp, const char ***argv)
133 int envchanged = 0, ret = 0, saved_errno = errno;
134 const char *subdir;
135 int count, option_count;
136 const char** new_argv;
137 const char *alias_command;
138 char *alias_string;
139 int unused_nongit;
141 subdir = setup_git_directory_gently(&unused_nongit);
143 alias_command = (*argv)[0];
144 alias_string = alias_lookup(alias_command);
145 if (alias_string) {
146 if (alias_string[0] == '!') {
147 if (*argcp > 1) {
148 struct strbuf buf;
150 strbuf_init(&buf, PATH_MAX);
151 strbuf_addstr(&buf, alias_string);
152 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
153 free(alias_string);
154 alias_string = buf.buf;
156 trace_printf("trace: alias to shell cmd: %s => %s\n",
157 alias_command, alias_string + 1);
158 ret = system(alias_string + 1);
159 if (ret >= 0 && WIFEXITED(ret) &&
160 WEXITSTATUS(ret) != 127)
161 exit(WEXITSTATUS(ret));
162 die("Failed to run '%s' when expanding alias '%s'",
163 alias_string + 1, alias_command);
165 count = split_cmdline(alias_string, &new_argv);
166 if (count < 0)
167 die("Bad alias.%s string", alias_command);
168 option_count = handle_options(&new_argv, &count, &envchanged);
169 if (envchanged)
170 die("alias '%s' changes environment variables\n"
171 "You can use '!git' in the alias to do this.",
172 alias_command);
173 memmove(new_argv - option_count, new_argv,
174 count * sizeof(char *));
175 new_argv -= option_count;
177 if (count < 1)
178 die("empty alias for %s", alias_command);
180 if (!strcmp(alias_command, new_argv[0]))
181 die("recursive alias: %s", alias_command);
183 trace_argv_printf(new_argv,
184 "trace: alias expansion: %s =>",
185 alias_command);
187 new_argv = xrealloc(new_argv, sizeof(char*) *
188 (count + *argcp + 1));
189 /* insert after command name */
190 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
191 new_argv[count+*argcp] = NULL;
193 *argv = new_argv;
194 *argcp += count - 1;
196 ret = 1;
199 if (subdir && chdir(subdir))
200 die("Cannot change to %s: %s", subdir, strerror(errno));
202 errno = saved_errno;
204 return ret;
207 const char git_version_string[] = GIT_VERSION;
209 #define RUN_SETUP (1<<0)
210 #define USE_PAGER (1<<1)
212 * require working tree to be present -- anything uses this needs
213 * RUN_SETUP for reading from the configuration file.
215 #define NEED_WORK_TREE (1<<2)
217 struct cmd_struct {
218 const char *cmd;
219 int (*fn)(int, const char **, const char *);
220 int option;
223 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
225 int status;
226 struct stat st;
227 const char *prefix;
229 prefix = NULL;
230 if (p->option & RUN_SETUP)
231 prefix = setup_git_directory();
233 if (use_pager == -1 && p->option & RUN_SETUP)
234 use_pager = check_pager_config(p->cmd);
235 if (use_pager == -1 && p->option & USE_PAGER)
236 use_pager = 1;
237 commit_pager_choice();
239 if (p->option & NEED_WORK_TREE)
240 setup_work_tree();
242 trace_argv_printf(argv, "trace: built-in: git");
244 status = p->fn(argc, argv, prefix);
245 if (status)
246 return status & 0xff;
248 /* Somebody closed stdout? */
249 if (fstat(fileno(stdout), &st))
250 return 0;
251 /* Ignore write errors for pipes and sockets.. */
252 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
253 return 0;
255 /* Check for ENOSPC and EIO errors.. */
256 if (fflush(stdout))
257 die("write failure on standard output: %s", strerror(errno));
258 if (ferror(stdout))
259 die("unknown write failure on standard output");
260 if (fclose(stdout))
261 die("close failed on standard output: %s", strerror(errno));
262 return 0;
265 static void handle_internal_command(int argc, const char **argv)
267 const char *cmd = argv[0];
268 static struct cmd_struct commands[] = {
269 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
270 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
271 { "annotate", cmd_annotate, RUN_SETUP },
272 { "apply", cmd_apply },
273 { "archive", cmd_archive },
274 { "blame", cmd_blame, RUN_SETUP },
275 { "branch", cmd_branch, RUN_SETUP },
276 { "bundle", cmd_bundle },
277 { "cat-file", cmd_cat_file, RUN_SETUP },
278 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
279 { "checkout-index", cmd_checkout_index,
280 RUN_SETUP | NEED_WORK_TREE},
281 { "check-ref-format", cmd_check_ref_format },
282 { "check-attr", cmd_check_attr, RUN_SETUP },
283 { "cherry", cmd_cherry, RUN_SETUP },
284 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
285 { "clone", cmd_clone },
286 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
287 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
288 { "commit-tree", cmd_commit_tree, RUN_SETUP },
289 { "config", cmd_config },
290 { "count-objects", cmd_count_objects, RUN_SETUP },
291 { "describe", cmd_describe, RUN_SETUP },
292 { "diff", cmd_diff },
293 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
294 { "diff-index", cmd_diff_index, RUN_SETUP },
295 { "diff-tree", cmd_diff_tree, RUN_SETUP },
296 { "fast-export", cmd_fast_export, RUN_SETUP },
297 { "fetch", cmd_fetch, RUN_SETUP },
298 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
299 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
300 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
301 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
302 { "format-patch", cmd_format_patch, RUN_SETUP },
303 { "fsck", cmd_fsck, RUN_SETUP },
304 { "fsck-objects", cmd_fsck, RUN_SETUP },
305 { "gc", cmd_gc, RUN_SETUP },
306 { "get-tar-commit-id", cmd_get_tar_commit_id },
307 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
308 { "help", cmd_help },
309 #ifndef NO_CURL
310 { "http-fetch", cmd_http_fetch, RUN_SETUP },
311 #endif
312 { "init", cmd_init_db },
313 { "init-db", cmd_init_db },
314 { "log", cmd_log, RUN_SETUP | USE_PAGER },
315 { "ls-files", cmd_ls_files, RUN_SETUP },
316 { "ls-tree", cmd_ls_tree, RUN_SETUP },
317 { "ls-remote", cmd_ls_remote },
318 { "mailinfo", cmd_mailinfo },
319 { "mailsplit", cmd_mailsplit },
320 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
321 { "merge-base", cmd_merge_base, RUN_SETUP },
322 { "merge-file", cmd_merge_file },
323 { "merge-ours", cmd_merge_ours, RUN_SETUP },
324 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
325 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
326 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
327 { "name-rev", cmd_name_rev, RUN_SETUP },
328 { "pack-objects", cmd_pack_objects, RUN_SETUP },
329 { "peek-remote", cmd_ls_remote },
330 { "pickaxe", cmd_blame, RUN_SETUP },
331 { "prune", cmd_prune, RUN_SETUP },
332 { "prune-packed", cmd_prune_packed, RUN_SETUP },
333 { "push", cmd_push, RUN_SETUP },
334 { "read-tree", cmd_read_tree, RUN_SETUP },
335 { "receive-pack", cmd_receive_pack },
336 { "reflog", cmd_reflog, RUN_SETUP },
337 { "remote", cmd_remote, RUN_SETUP },
338 { "repo-config", cmd_config },
339 { "rerere", cmd_rerere, RUN_SETUP },
340 { "reset", cmd_reset, RUN_SETUP },
341 { "rev-list", cmd_rev_list, RUN_SETUP },
342 { "rev-parse", cmd_rev_parse },
343 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
344 { "rm", cmd_rm, RUN_SETUP },
345 { "send-pack", cmd_send_pack, RUN_SETUP },
346 { "shortlog", cmd_shortlog, USE_PAGER },
347 { "show-branch", cmd_show_branch, RUN_SETUP },
348 { "show", cmd_show, RUN_SETUP | USE_PAGER },
349 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
350 { "stripspace", cmd_stripspace },
351 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
352 { "tag", cmd_tag, RUN_SETUP },
353 { "tar-tree", cmd_tar_tree },
354 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
355 { "update-index", cmd_update_index, RUN_SETUP },
356 { "update-ref", cmd_update_ref, RUN_SETUP },
357 { "upload-archive", cmd_upload_archive },
358 { "verify-tag", cmd_verify_tag, RUN_SETUP },
359 { "version", cmd_version },
360 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
361 { "write-tree", cmd_write_tree, RUN_SETUP },
362 { "verify-pack", cmd_verify_pack },
363 { "show-ref", cmd_show_ref, RUN_SETUP },
364 { "pack-refs", cmd_pack_refs, RUN_SETUP },
366 int i;
367 static const char ext[] = STRIP_EXTENSION;
369 if (sizeof(ext) > 1) {
370 i = strlen(argv[0]) - strlen(ext);
371 if (i > 0 && !strcmp(argv[0] + i, ext)) {
372 char *argv0 = xstrdup(argv[0]);
373 argv[0] = cmd = argv0;
374 argv0[i] = '\0';
378 /* Turn "git cmd --help" into "git help cmd" */
379 if (argc > 1 && !strcmp(argv[1], "--help")) {
380 argv[1] = argv[0];
381 argv[0] = cmd = "help";
384 for (i = 0; i < ARRAY_SIZE(commands); i++) {
385 struct cmd_struct *p = commands+i;
386 if (strcmp(p->cmd, cmd))
387 continue;
388 exit(run_builtin(p, argc, argv));
392 static void execv_dashed_external(const char **argv)
394 struct strbuf cmd = STRBUF_INIT;
395 const char *tmp;
396 int status;
398 strbuf_addf(&cmd, "git-%s", argv[0]);
401 * argv[0] must be the git command, but the argv array
402 * belongs to the caller, and may be reused in
403 * subsequent loop iterations. Save argv[0] and
404 * restore it on error.
406 tmp = argv[0];
407 argv[0] = cmd.buf;
409 trace_argv_printf(argv, "trace: exec:");
412 * if we fail because the command is not found, it is
413 * OK to return. Otherwise, we just pass along the status code.
415 status = run_command_v_opt(argv, 0);
416 if (status != -ERR_RUN_COMMAND_EXEC) {
417 if (IS_RUN_COMMAND_ERR(status))
418 die("unable to run '%s'", argv[0]);
419 exit(-status);
421 errno = ENOENT; /* as if we called execvp */
423 argv[0] = tmp;
425 strbuf_release(&cmd);
428 static int run_argv(int *argcp, const char ***argv)
430 int done_alias = 0;
432 while (1) {
433 /* See if it's an internal command */
434 handle_internal_command(*argcp, *argv);
436 /* .. then try the external ones */
437 execv_dashed_external(*argv);
439 /* It could be an alias -- this works around the insanity
440 * of overriding "git log" with "git show" by having
441 * alias.log = show
443 if (done_alias || !handle_alias(argcp, argv))
444 break;
445 done_alias = 1;
448 return done_alias;
452 int main(int argc, const char **argv)
454 const char *cmd;
456 cmd = git_extract_argv0_path(argv[0]);
457 if (!cmd)
458 cmd = "git-help";
461 * "git-xxxx" is the same as "git xxxx", but we obviously:
463 * - cannot take flags in between the "git" and the "xxxx".
464 * - cannot execute it externally (since it would just do
465 * the same thing over again)
467 * So we just directly call the internal command handler, and
468 * die if that one cannot handle it.
470 if (!prefixcmp(cmd, "git-")) {
471 cmd += 4;
472 argv[0] = cmd;
473 handle_internal_command(argc, argv);
474 die("cannot handle %s internally", cmd);
477 /* Look for flags.. */
478 argv++;
479 argc--;
480 handle_options(&argv, &argc, NULL);
481 commit_pager_choice();
482 if (argc > 0) {
483 if (!prefixcmp(argv[0], "--"))
484 argv[0] += 2;
485 } else {
486 /* The user didn't specify a command; give them help */
487 printf("usage: %s\n\n", git_usage_string);
488 list_common_cmds_help();
489 printf("\n%s\n", git_more_info_string);
490 exit(1);
492 cmd = argv[0];
495 * We use PATH to find git commands, but we prepend some higher
496 * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
497 * environment, and the $(gitexecdir) from the Makefile at build
498 * time.
500 setup_path();
502 while (1) {
503 static int done_help = 0;
504 static int was_alias = 0;
505 was_alias = run_argv(&argc, &argv);
506 if (errno != ENOENT)
507 break;
508 if (was_alias) {
509 fprintf(stderr, "Expansion of alias '%s' failed; "
510 "'%s' is not a git-command\n",
511 cmd, argv[0]);
512 exit(1);
514 if (!done_help) {
515 cmd = argv[0] = help_unknown_cmd(cmd);
516 done_help = 1;
517 } else
518 break;
521 fprintf(stderr, "Failed to run command '%s': %s\n",
522 cmd, strerror(errno));
524 return 1;