Merge branch 'jk/maint-pass-c-config-in-env'
[git/git.git] / git.c
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5 #include "run-command.h"
6
7 const char git_usage_string[] =
8 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
9 " [-p|--paginate|--no-pager] [--no-replace-objects]\n"
10 " [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
11 " [-c name=value] [--help]\n"
12 " COMMAND [ARGS]";
13
14 const char git_more_info_string[] =
15 "See 'git help COMMAND' for more information on a specific command.";
16
17 static struct startup_info git_startup_info;
18 static int use_pager = -1;
19 struct pager_config {
20 const char *cmd;
21 int val;
22 };
23
24 static int pager_command_config(const char *var, const char *value, void *data)
25 {
26 struct pager_config *c = data;
27 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
28 c->val = git_config_bool(var, value);
29 return 0;
30 }
31
32 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
33 int check_pager_config(const char *cmd)
34 {
35 struct pager_config c;
36 c.cmd = cmd;
37 c.val = -1;
38 git_config(pager_command_config, &c);
39 return c.val;
40 }
41
42 static void commit_pager_choice(void) {
43 switch (use_pager) {
44 case 0:
45 setenv("GIT_PAGER", "cat", 1);
46 break;
47 case 1:
48 setup_pager();
49 break;
50 default:
51 break;
52 }
53 }
54
55 static int handle_options(const char ***argv, int *argc, int *envchanged)
56 {
57 int handled = 0;
58
59 if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
60 setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);
61
62 while (*argc > 0) {
63 const char *cmd = (*argv)[0];
64 if (cmd[0] != '-')
65 break;
66
67 /*
68 * For legacy reasons, the "version" and "help"
69 * commands can be written with "--" prepended
70 * to make them look like flags.
71 */
72 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
73 break;
74
75 /*
76 * Check remaining flags.
77 */
78 if (!prefixcmp(cmd, "--exec-path")) {
79 cmd += 11;
80 if (*cmd == '=')
81 git_set_argv_exec_path(cmd + 1);
82 else {
83 puts(git_exec_path());
84 exit(0);
85 }
86 } else if (!strcmp(cmd, "--html-path")) {
87 puts(system_path(GIT_HTML_PATH));
88 exit(0);
89 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
90 use_pager = 1;
91 } else if (!strcmp(cmd, "--no-pager")) {
92 use_pager = 0;
93 if (envchanged)
94 *envchanged = 1;
95 } else if (!strcmp(cmd, "--no-replace-objects")) {
96 read_replace_refs = 0;
97 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
98 if (envchanged)
99 *envchanged = 1;
100 } else if (!strcmp(cmd, "--git-dir")) {
101 if (*argc < 2) {
102 fprintf(stderr, "No directory given for --git-dir.\n" );
103 usage(git_usage_string);
104 }
105 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
106 if (envchanged)
107 *envchanged = 1;
108 (*argv)++;
109 (*argc)--;
110 handled++;
111 } else if (!prefixcmp(cmd, "--git-dir=")) {
112 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
113 if (envchanged)
114 *envchanged = 1;
115 } else if (!strcmp(cmd, "--work-tree")) {
116 if (*argc < 2) {
117 fprintf(stderr, "No directory given for --work-tree.\n" );
118 usage(git_usage_string);
119 }
120 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
121 if (envchanged)
122 *envchanged = 1;
123 (*argv)++;
124 (*argc)--;
125 } else if (!prefixcmp(cmd, "--work-tree=")) {
126 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
127 if (envchanged)
128 *envchanged = 1;
129 } else if (!strcmp(cmd, "--bare")) {
130 static char git_dir[PATH_MAX+1];
131 is_bare_repository_cfg = 1;
132 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
133 if (envchanged)
134 *envchanged = 1;
135 } else if (!strcmp(cmd, "-c")) {
136 if (*argc < 2) {
137 fprintf(stderr, "-c expects a configuration string\n" );
138 usage(git_usage_string);
139 }
140 git_config_push_parameter((*argv)[1]);
141 (*argv)++;
142 (*argc)--;
143 } else {
144 fprintf(stderr, "Unknown option: %s\n", cmd);
145 usage(git_usage_string);
146 }
147
148 (*argv)++;
149 (*argc)--;
150 handled++;
151 }
152 return handled;
153 }
154
155 static int handle_alias(int *argcp, const char ***argv)
156 {
157 int envchanged = 0, ret = 0, saved_errno = errno;
158 const char *subdir;
159 int count, option_count;
160 const char **new_argv;
161 const char *alias_command;
162 char *alias_string;
163 int unused_nongit;
164
165 subdir = setup_git_directory_gently(&unused_nongit);
166
167 alias_command = (*argv)[0];
168 alias_string = alias_lookup(alias_command);
169 if (alias_string) {
170 if (alias_string[0] == '!') {
171 commit_pager_choice();
172 if (*argcp > 1) {
173 struct strbuf buf;
174
175 strbuf_init(&buf, PATH_MAX);
176 strbuf_addstr(&buf, alias_string);
177 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
178 free(alias_string);
179 alias_string = buf.buf;
180 }
181 trace_printf("trace: alias to shell cmd: %s => %s\n",
182 alias_command, alias_string + 1);
183 ret = system(alias_string + 1);
184 if (ret >= 0 && WIFEXITED(ret) &&
185 WEXITSTATUS(ret) != 127)
186 exit(WEXITSTATUS(ret));
187 die("Failed to run '%s' when expanding alias '%s'",
188 alias_string + 1, alias_command);
189 }
190 count = split_cmdline(alias_string, &new_argv);
191 if (count < 0)
192 die("Bad alias.%s string: %s", alias_command,
193 split_cmdline_strerror(count));
194 option_count = handle_options(&new_argv, &count, &envchanged);
195 if (envchanged)
196 die("alias '%s' changes environment variables\n"
197 "You can use '!git' in the alias to do this.",
198 alias_command);
199 memmove(new_argv - option_count, new_argv,
200 count * sizeof(char *));
201 new_argv -= option_count;
202
203 if (count < 1)
204 die("empty alias for %s", alias_command);
205
206 if (!strcmp(alias_command, new_argv[0]))
207 die("recursive alias: %s", alias_command);
208
209 trace_argv_printf(new_argv,
210 "trace: alias expansion: %s =>",
211 alias_command);
212
213 new_argv = xrealloc(new_argv, sizeof(char *) *
214 (count + *argcp));
215 /* insert after command name */
216 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
217
218 *argv = new_argv;
219 *argcp += count - 1;
220
221 ret = 1;
222 }
223
224 if (subdir && chdir(subdir))
225 die_errno("Cannot change to '%s'", subdir);
226
227 errno = saved_errno;
228
229 return ret;
230 }
231
232 const char git_version_string[] = GIT_VERSION;
233
234 #define RUN_SETUP (1<<0)
235 #define RUN_SETUP_GENTLY (1<<1)
236 #define USE_PAGER (1<<2)
237 /*
238 * require working tree to be present -- anything uses this needs
239 * RUN_SETUP for reading from the configuration file.
240 */
241 #define NEED_WORK_TREE (1<<3)
242
243 struct cmd_struct {
244 const char *cmd;
245 int (*fn)(int, const char **, const char *);
246 int option;
247 };
248
249 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
250 {
251 int status, help;
252 struct stat st;
253 const char *prefix;
254
255 prefix = NULL;
256 help = argc == 2 && !strcmp(argv[1], "-h");
257 if (!help) {
258 if (p->option & RUN_SETUP)
259 prefix = setup_git_directory();
260 if (p->option & RUN_SETUP_GENTLY) {
261 int nongit_ok;
262 prefix = setup_git_directory_gently(&nongit_ok);
263 }
264
265 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
266 use_pager = check_pager_config(p->cmd);
267 if (use_pager == -1 && p->option & USE_PAGER)
268 use_pager = 1;
269 }
270 commit_pager_choice();
271
272 if (!help && p->option & NEED_WORK_TREE)
273 setup_work_tree();
274
275 trace_argv_printf(argv, "trace: built-in: git");
276
277 status = p->fn(argc, argv, prefix);
278 if (status)
279 return status;
280
281 /* Somebody closed stdout? */
282 if (fstat(fileno(stdout), &st))
283 return 0;
284 /* Ignore write errors for pipes and sockets.. */
285 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
286 return 0;
287
288 /* Check for ENOSPC and EIO errors.. */
289 if (fflush(stdout))
290 die_errno("write failure on standard output");
291 if (ferror(stdout))
292 die("unknown write failure on standard output");
293 if (fclose(stdout))
294 die_errno("close failed on standard output");
295 return 0;
296 }
297
298 static void handle_internal_command(int argc, const char **argv)
299 {
300 const char *cmd = argv[0];
301 static struct cmd_struct commands[] = {
302 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
303 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
304 { "annotate", cmd_annotate, RUN_SETUP },
305 { "apply", cmd_apply, RUN_SETUP_GENTLY },
306 { "archive", cmd_archive },
307 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
308 { "blame", cmd_blame, RUN_SETUP },
309 { "branch", cmd_branch, RUN_SETUP },
310 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
311 { "cat-file", cmd_cat_file, RUN_SETUP },
312 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
313 { "checkout-index", cmd_checkout_index,
314 RUN_SETUP | NEED_WORK_TREE},
315 { "check-ref-format", cmd_check_ref_format },
316 { "check-attr", cmd_check_attr, RUN_SETUP },
317 { "cherry", cmd_cherry, RUN_SETUP },
318 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
319 { "clone", cmd_clone },
320 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
321 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
322 { "commit-tree", cmd_commit_tree, RUN_SETUP },
323 { "config", cmd_config, RUN_SETUP_GENTLY },
324 { "count-objects", cmd_count_objects, RUN_SETUP },
325 { "describe", cmd_describe, RUN_SETUP },
326 { "diff", cmd_diff },
327 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
328 { "diff-index", cmd_diff_index, RUN_SETUP },
329 { "diff-tree", cmd_diff_tree, RUN_SETUP },
330 { "fast-export", cmd_fast_export, RUN_SETUP },
331 { "fetch", cmd_fetch, RUN_SETUP },
332 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
333 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
334 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
335 { "format-patch", cmd_format_patch, RUN_SETUP },
336 { "fsck", cmd_fsck, RUN_SETUP },
337 { "fsck-objects", cmd_fsck, RUN_SETUP },
338 { "gc", cmd_gc, RUN_SETUP },
339 { "get-tar-commit-id", cmd_get_tar_commit_id },
340 { "grep", cmd_grep, RUN_SETUP_GENTLY },
341 { "hash-object", cmd_hash_object },
342 { "help", cmd_help },
343 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
344 { "init", cmd_init_db },
345 { "init-db", cmd_init_db },
346 { "log", cmd_log, RUN_SETUP },
347 { "ls-files", cmd_ls_files, RUN_SETUP },
348 { "ls-tree", cmd_ls_tree, RUN_SETUP },
349 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
350 { "mailinfo", cmd_mailinfo },
351 { "mailsplit", cmd_mailsplit },
352 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
353 { "merge-base", cmd_merge_base, RUN_SETUP },
354 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
355 { "merge-index", cmd_merge_index, RUN_SETUP },
356 { "merge-ours", cmd_merge_ours, RUN_SETUP },
357 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
358 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
359 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
360 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
361 { "merge-tree", cmd_merge_tree, RUN_SETUP },
362 { "mktag", cmd_mktag, RUN_SETUP },
363 { "mktree", cmd_mktree, RUN_SETUP },
364 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
365 { "name-rev", cmd_name_rev, RUN_SETUP },
366 { "notes", cmd_notes, RUN_SETUP },
367 { "pack-objects", cmd_pack_objects, RUN_SETUP },
368 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
369 { "patch-id", cmd_patch_id },
370 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
371 { "pickaxe", cmd_blame, RUN_SETUP },
372 { "prune", cmd_prune, RUN_SETUP },
373 { "prune-packed", cmd_prune_packed, RUN_SETUP },
374 { "push", cmd_push, RUN_SETUP },
375 { "read-tree", cmd_read_tree, RUN_SETUP },
376 { "receive-pack", cmd_receive_pack },
377 { "reflog", cmd_reflog, RUN_SETUP },
378 { "remote", cmd_remote, RUN_SETUP },
379 { "replace", cmd_replace, RUN_SETUP },
380 { "repo-config", cmd_config, RUN_SETUP_GENTLY },
381 { "rerere", cmd_rerere, RUN_SETUP },
382 { "reset", cmd_reset, RUN_SETUP },
383 { "rev-list", cmd_rev_list, RUN_SETUP },
384 { "rev-parse", cmd_rev_parse },
385 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
386 { "rm", cmd_rm, RUN_SETUP },
387 { "send-pack", cmd_send_pack, RUN_SETUP },
388 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
389 { "show-branch", cmd_show_branch, RUN_SETUP },
390 { "show", cmd_show, RUN_SETUP },
391 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
392 { "stripspace", cmd_stripspace },
393 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
394 { "tag", cmd_tag, RUN_SETUP },
395 { "tar-tree", cmd_tar_tree },
396 { "unpack-file", cmd_unpack_file, RUN_SETUP },
397 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
398 { "update-index", cmd_update_index, RUN_SETUP },
399 { "update-ref", cmd_update_ref, RUN_SETUP },
400 { "update-server-info", cmd_update_server_info, RUN_SETUP },
401 { "upload-archive", cmd_upload_archive },
402 { "var", cmd_var, RUN_SETUP_GENTLY },
403 { "verify-tag", cmd_verify_tag, RUN_SETUP },
404 { "version", cmd_version },
405 { "whatchanged", cmd_whatchanged, RUN_SETUP },
406 { "write-tree", cmd_write_tree, RUN_SETUP },
407 { "verify-pack", cmd_verify_pack },
408 { "show-ref", cmd_show_ref, RUN_SETUP },
409 { "pack-refs", cmd_pack_refs, RUN_SETUP },
410 };
411 int i;
412 static const char ext[] = STRIP_EXTENSION;
413
414 if (sizeof(ext) > 1) {
415 i = strlen(argv[0]) - strlen(ext);
416 if (i > 0 && !strcmp(argv[0] + i, ext)) {
417 char *argv0 = xstrdup(argv[0]);
418 argv[0] = cmd = argv0;
419 argv0[i] = '\0';
420 }
421 }
422
423 /* Turn "git cmd --help" into "git help cmd" */
424 if (argc > 1 && !strcmp(argv[1], "--help")) {
425 argv[1] = argv[0];
426 argv[0] = cmd = "help";
427 }
428
429 for (i = 0; i < ARRAY_SIZE(commands); i++) {
430 struct cmd_struct *p = commands+i;
431 if (strcmp(p->cmd, cmd))
432 continue;
433 exit(run_builtin(p, argc, argv));
434 }
435 }
436
437 static void execv_dashed_external(const char **argv)
438 {
439 struct strbuf cmd = STRBUF_INIT;
440 const char *tmp;
441 int status;
442
443 commit_pager_choice();
444
445 strbuf_addf(&cmd, "git-%s", argv[0]);
446
447 /*
448 * argv[0] must be the git command, but the argv array
449 * belongs to the caller, and may be reused in
450 * subsequent loop iterations. Save argv[0] and
451 * restore it on error.
452 */
453 tmp = argv[0];
454 argv[0] = cmd.buf;
455
456 trace_argv_printf(argv, "trace: exec:");
457
458 /*
459 * if we fail because the command is not found, it is
460 * OK to return. Otherwise, we just pass along the status code.
461 */
462 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
463 if (status >= 0 || errno != ENOENT)
464 exit(status);
465
466 argv[0] = tmp;
467
468 strbuf_release(&cmd);
469 }
470
471 static int run_argv(int *argcp, const char ***argv)
472 {
473 int done_alias = 0;
474
475 while (1) {
476 /* See if it's an internal command */
477 handle_internal_command(*argcp, *argv);
478
479 /* .. then try the external ones */
480 execv_dashed_external(*argv);
481
482 /* It could be an alias -- this works around the insanity
483 * of overriding "git log" with "git show" by having
484 * alias.log = show
485 */
486 if (done_alias || !handle_alias(argcp, argv))
487 break;
488 done_alias = 1;
489 }
490
491 return done_alias;
492 }
493
494
495 int main(int argc, const char **argv)
496 {
497 const char *cmd;
498
499 startup_info = &git_startup_info;
500
501 cmd = git_extract_argv0_path(argv[0]);
502 if (!cmd)
503 cmd = "git-help";
504
505 /*
506 * "git-xxxx" is the same as "git xxxx", but we obviously:
507 *
508 * - cannot take flags in between the "git" and the "xxxx".
509 * - cannot execute it externally (since it would just do
510 * the same thing over again)
511 *
512 * So we just directly call the internal command handler, and
513 * die if that one cannot handle it.
514 */
515 if (!prefixcmp(cmd, "git-")) {
516 cmd += 4;
517 argv[0] = cmd;
518 handle_internal_command(argc, argv);
519 die("cannot handle %s internally", cmd);
520 }
521
522 /* Look for flags.. */
523 argv++;
524 argc--;
525 handle_options(&argv, &argc, NULL);
526 if (argc > 0) {
527 if (!prefixcmp(argv[0], "--"))
528 argv[0] += 2;
529 } else {
530 /* The user didn't specify a command; give them help */
531 commit_pager_choice();
532 printf("usage: %s\n\n", git_usage_string);
533 list_common_cmds_help();
534 printf("\n%s\n", git_more_info_string);
535 exit(1);
536 }
537 cmd = argv[0];
538
539 /*
540 * We use PATH to find git commands, but we prepend some higher
541 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
542 * environment, and the $(gitexecdir) from the Makefile at build
543 * time.
544 */
545 setup_path();
546
547 while (1) {
548 static int done_help = 0;
549 static int was_alias = 0;
550 was_alias = run_argv(&argc, &argv);
551 if (errno != ENOENT)
552 break;
553 if (was_alias) {
554 fprintf(stderr, "Expansion of alias '%s' failed; "
555 "'%s' is not a git command\n",
556 cmd, argv[0]);
557 exit(1);
558 }
559 if (!done_help) {
560 cmd = argv[0] = help_unknown_cmd(cmd);
561 done_help = 1;
562 } else
563 break;
564 }
565
566 fprintf(stderr, "Failed to run command '%s': %s\n",
567 cmd, strerror(errno));
568
569 return 1;
570 }