Merge branch 'ls/git-gui-no-double-utf8-author-name'
[git/git.git] / setup.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "dir.h"
5 #include "string-list.h"
6
7 static int inside_git_dir = -1;
8 static int inside_work_tree = -1;
9 static int work_tree_config_is_bogus;
10
11 static struct startup_info the_startup_info;
12 struct startup_info *startup_info = &the_startup_info;
13
14 /*
15 * The input parameter must contain an absolute path, and it must already be
16 * normalized.
17 *
18 * Find the part of an absolute path that lies inside the work tree by
19 * dereferencing symlinks outside the work tree, for example:
20 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
21 * /dir/file (work tree is /) -> dir/file
22 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
23 * /dir/repolink/file (repolink points to /dir/repo) -> file
24 * /dir/repo (exactly equal to work tree) -> (empty string)
25 */
26 static int abspath_part_inside_repo(char *path)
27 {
28 size_t len;
29 size_t wtlen;
30 char *path0;
31 int off;
32 const char *work_tree = get_git_work_tree();
33
34 if (!work_tree)
35 return -1;
36 wtlen = strlen(work_tree);
37 len = strlen(path);
38 off = offset_1st_component(path);
39
40 /* check if work tree is already the prefix */
41 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
42 if (path[wtlen] == '/') {
43 memmove(path, path + wtlen + 1, len - wtlen);
44 return 0;
45 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
46 /* work tree is the root, or the whole path */
47 memmove(path, path + wtlen, len - wtlen + 1);
48 return 0;
49 }
50 /* work tree might match beginning of a symlink to work tree */
51 off = wtlen;
52 }
53 path0 = path;
54 path += off;
55
56 /* check each '/'-terminated level */
57 while (*path) {
58 path++;
59 if (*path == '/') {
60 *path = '\0';
61 if (strcmp(real_path(path0), work_tree) == 0) {
62 memmove(path0, path + 1, len - (path - path0));
63 return 0;
64 }
65 *path = '/';
66 }
67 }
68
69 /* check whole path */
70 if (strcmp(real_path(path0), work_tree) == 0) {
71 *path0 = '\0';
72 return 0;
73 }
74
75 return -1;
76 }
77
78 /*
79 * Normalize "path", prepending the "prefix" for relative paths. If
80 * remaining_prefix is not NULL, return the actual prefix still
81 * remains in the path. For example, prefix = sub1/sub2/ and path is
82 *
83 * foo -> sub1/sub2/foo (full prefix)
84 * ../foo -> sub1/foo (remaining prefix is sub1/)
85 * ../../bar -> bar (no remaining prefix)
86 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
87 * `pwd`/../bar -> sub1/bar (no remaining prefix)
88 */
89 char *prefix_path_gently(const char *prefix, int len,
90 int *remaining_prefix, const char *path)
91 {
92 const char *orig = path;
93 char *sanitized;
94 if (is_absolute_path(orig)) {
95 sanitized = xmallocz(strlen(path));
96 if (remaining_prefix)
97 *remaining_prefix = 0;
98 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
99 free(sanitized);
100 return NULL;
101 }
102 if (abspath_part_inside_repo(sanitized)) {
103 free(sanitized);
104 return NULL;
105 }
106 } else {
107 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
108 if (remaining_prefix)
109 *remaining_prefix = len;
110 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
111 free(sanitized);
112 return NULL;
113 }
114 }
115 return sanitized;
116 }
117
118 char *prefix_path(const char *prefix, int len, const char *path)
119 {
120 char *r = prefix_path_gently(prefix, len, NULL, path);
121 if (!r)
122 die("'%s' is outside repository", path);
123 return r;
124 }
125
126 int path_inside_repo(const char *prefix, const char *path)
127 {
128 int len = prefix ? strlen(prefix) : 0;
129 char *r = prefix_path_gently(prefix, len, NULL, path);
130 if (r) {
131 free(r);
132 return 1;
133 }
134 return 0;
135 }
136
137 int check_filename(const char *prefix, const char *arg)
138 {
139 char *to_free = NULL;
140 struct stat st;
141
142 if (skip_prefix(arg, ":/", &arg)) {
143 if (!*arg) /* ":/" is root dir, always exists */
144 return 1;
145 prefix = NULL;
146 } else if (skip_prefix(arg, ":!", &arg) ||
147 skip_prefix(arg, ":^", &arg)) {
148 if (!*arg) /* excluding everything is silly, but allowed */
149 return 1;
150 }
151
152 if (prefix)
153 arg = to_free = prefix_filename(prefix, arg);
154
155 if (!lstat(arg, &st)) {
156 free(to_free);
157 return 1; /* file exists */
158 }
159 if (is_missing_file_error(errno)) {
160 free(to_free);
161 return 0; /* file does not exist */
162 }
163 die_errno("failed to stat '%s'", arg);
164 }
165
166 static void NORETURN die_verify_filename(const char *prefix,
167 const char *arg,
168 int diagnose_misspelt_rev)
169 {
170 if (!diagnose_misspelt_rev)
171 die(_("%s: no such path in the working tree.\n"
172 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
173 arg);
174 /*
175 * Saying "'(icase)foo' does not exist in the index" when the
176 * user gave us ":(icase)foo" is just stupid. A magic pathspec
177 * begins with a colon and is followed by a non-alnum; do not
178 * let maybe_die_on_misspelt_object_name() even trigger.
179 */
180 if (!(arg[0] == ':' && !isalnum(arg[1])))
181 maybe_die_on_misspelt_object_name(arg, prefix);
182
183 /* ... or fall back the most general message. */
184 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
185 "Use '--' to separate paths from revisions, like this:\n"
186 "'git <command> [<revision>...] -- [<file>...]'"), arg);
187
188 }
189
190 /*
191 * Check for arguments that don't resolve as actual files,
192 * but which look sufficiently like pathspecs that we'll consider
193 * them such for the purposes of rev/pathspec DWIM parsing.
194 */
195 static int looks_like_pathspec(const char *arg)
196 {
197 /* anything with a wildcard character */
198 if (!no_wildcard(arg))
199 return 1;
200
201 /* long-form pathspec magic */
202 if (starts_with(arg, ":("))
203 return 1;
204
205 return 0;
206 }
207
208 /*
209 * Verify a filename that we got as an argument for a pathspec
210 * entry. Note that a filename that begins with "-" never verifies
211 * as true, because even if such a filename were to exist, we want
212 * it to be preceded by the "--" marker (or we want the user to
213 * use a format like "./-filename")
214 *
215 * The "diagnose_misspelt_rev" is used to provide a user-friendly
216 * diagnosis when dying upon finding that "name" is not a pathname.
217 * If set to 1, the diagnosis will try to diagnose "name" as an
218 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
219 * will only complain about an inexisting file.
220 *
221 * This function is typically called to check that a "file or rev"
222 * argument is unambiguous. In this case, the caller will want
223 * diagnose_misspelt_rev == 1 when verifying the first non-rev
224 * argument (which could have been a revision), and
225 * diagnose_misspelt_rev == 0 for the next ones (because we already
226 * saw a filename, there's not ambiguity anymore).
227 */
228 void verify_filename(const char *prefix,
229 const char *arg,
230 int diagnose_misspelt_rev)
231 {
232 if (*arg == '-')
233 die("option '%s' must come before non-option arguments", arg);
234 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
235 return;
236 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
237 }
238
239 /*
240 * Opposite of the above: the command line did not have -- marker
241 * and we parsed the arg as a refname. It should not be interpretable
242 * as a filename.
243 */
244 void verify_non_filename(const char *prefix, const char *arg)
245 {
246 if (!is_inside_work_tree() || is_inside_git_dir())
247 return;
248 if (*arg == '-')
249 return; /* flag */
250 if (!check_filename(prefix, arg))
251 return;
252 die(_("ambiguous argument '%s': both revision and filename\n"
253 "Use '--' to separate paths from revisions, like this:\n"
254 "'git <command> [<revision>...] -- [<file>...]'"), arg);
255 }
256
257 int get_common_dir(struct strbuf *sb, const char *gitdir)
258 {
259 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
260 if (git_env_common_dir) {
261 strbuf_addstr(sb, git_env_common_dir);
262 return 1;
263 } else {
264 return get_common_dir_noenv(sb, gitdir);
265 }
266 }
267
268 int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
269 {
270 struct strbuf data = STRBUF_INIT;
271 struct strbuf path = STRBUF_INIT;
272 int ret = 0;
273
274 strbuf_addf(&path, "%s/commondir", gitdir);
275 if (file_exists(path.buf)) {
276 if (strbuf_read_file(&data, path.buf, 0) <= 0)
277 die_errno(_("failed to read %s"), path.buf);
278 while (data.len && (data.buf[data.len - 1] == '\n' ||
279 data.buf[data.len - 1] == '\r'))
280 data.len--;
281 data.buf[data.len] = '\0';
282 strbuf_reset(&path);
283 if (!is_absolute_path(data.buf))
284 strbuf_addf(&path, "%s/", gitdir);
285 strbuf_addbuf(&path, &data);
286 strbuf_add_real_path(sb, path.buf);
287 ret = 1;
288 } else {
289 strbuf_addstr(sb, gitdir);
290 }
291
292 strbuf_release(&data);
293 strbuf_release(&path);
294 return ret;
295 }
296
297 /*
298 * Test if it looks like we're at a git directory.
299 * We want to see:
300 *
301 * - either an objects/ directory _or_ the proper
302 * GIT_OBJECT_DIRECTORY environment variable
303 * - a refs/ directory
304 * - either a HEAD symlink or a HEAD file that is formatted as
305 * a proper "ref:", or a regular file HEAD that has a properly
306 * formatted sha1 object name.
307 */
308 int is_git_directory(const char *suspect)
309 {
310 struct strbuf path = STRBUF_INIT;
311 int ret = 0;
312 size_t len;
313
314 /* Check worktree-related signatures */
315 strbuf_addstr(&path, suspect);
316 strbuf_complete(&path, '/');
317 strbuf_addstr(&path, "HEAD");
318 if (validate_headref(path.buf))
319 goto done;
320
321 strbuf_reset(&path);
322 get_common_dir(&path, suspect);
323 len = path.len;
324
325 /* Check non-worktree-related signatures */
326 if (getenv(DB_ENVIRONMENT)) {
327 if (access(getenv(DB_ENVIRONMENT), X_OK))
328 goto done;
329 }
330 else {
331 strbuf_setlen(&path, len);
332 strbuf_addstr(&path, "/objects");
333 if (access(path.buf, X_OK))
334 goto done;
335 }
336
337 strbuf_setlen(&path, len);
338 strbuf_addstr(&path, "/refs");
339 if (access(path.buf, X_OK))
340 goto done;
341
342 ret = 1;
343 done:
344 strbuf_release(&path);
345 return ret;
346 }
347
348 int is_nonbare_repository_dir(struct strbuf *path)
349 {
350 int ret = 0;
351 int gitfile_error;
352 size_t orig_path_len = path->len;
353 assert(orig_path_len != 0);
354 strbuf_complete(path, '/');
355 strbuf_addstr(path, ".git");
356 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
357 ret = 1;
358 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
359 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
360 ret = 1;
361 strbuf_setlen(path, orig_path_len);
362 return ret;
363 }
364
365 int is_inside_git_dir(void)
366 {
367 if (inside_git_dir < 0)
368 inside_git_dir = is_inside_dir(get_git_dir());
369 return inside_git_dir;
370 }
371
372 int is_inside_work_tree(void)
373 {
374 if (inside_work_tree < 0)
375 inside_work_tree = is_inside_dir(get_git_work_tree());
376 return inside_work_tree;
377 }
378
379 void setup_work_tree(void)
380 {
381 const char *work_tree, *git_dir;
382 static int initialized = 0;
383
384 if (initialized)
385 return;
386
387 if (work_tree_config_is_bogus)
388 die("unable to set up work tree using invalid config");
389
390 work_tree = get_git_work_tree();
391 git_dir = get_git_dir();
392 if (!is_absolute_path(git_dir))
393 git_dir = real_path(get_git_dir());
394 if (!work_tree || chdir(work_tree))
395 die("This operation must be run in a work tree");
396
397 /*
398 * Make sure subsequent git processes find correct worktree
399 * if $GIT_WORK_TREE is set relative
400 */
401 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
402 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
403
404 set_git_dir(remove_leading_path(git_dir, work_tree));
405 initialized = 1;
406 }
407
408 static int check_repo_format(const char *var, const char *value, void *vdata)
409 {
410 struct repository_format *data = vdata;
411 const char *ext;
412
413 if (strcmp(var, "core.repositoryformatversion") == 0)
414 data->version = git_config_int(var, value);
415 else if (skip_prefix(var, "extensions.", &ext)) {
416 /*
417 * record any known extensions here; otherwise,
418 * we fall through to recording it as unknown, and
419 * check_repository_format will complain
420 */
421 if (!strcmp(ext, "noop"))
422 ;
423 else if (!strcmp(ext, "preciousobjects"))
424 data->precious_objects = git_config_bool(var, value);
425 else
426 string_list_append(&data->unknown_extensions, ext);
427 } else if (strcmp(var, "core.bare") == 0) {
428 data->is_bare = git_config_bool(var, value);
429 } else if (strcmp(var, "core.worktree") == 0) {
430 if (!value)
431 return config_error_nonbool(var);
432 data->work_tree = xstrdup(value);
433 }
434 return 0;
435 }
436
437 static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
438 {
439 struct strbuf sb = STRBUF_INIT;
440 struct strbuf err = STRBUF_INIT;
441 int has_common;
442
443 has_common = get_common_dir(&sb, gitdir);
444 strbuf_addstr(&sb, "/config");
445 read_repository_format(candidate, sb.buf);
446 strbuf_release(&sb);
447
448 /*
449 * For historical use of check_repository_format() in git-init,
450 * we treat a missing config as a silent "ok", even when nongit_ok
451 * is unset.
452 */
453 if (candidate->version < 0)
454 return 0;
455
456 if (verify_repository_format(candidate, &err) < 0) {
457 if (nongit_ok) {
458 warning("%s", err.buf);
459 strbuf_release(&err);
460 *nongit_ok = -1;
461 return -1;
462 }
463 die("%s", err.buf);
464 }
465
466 repository_format_precious_objects = candidate->precious_objects;
467 string_list_clear(&candidate->unknown_extensions, 0);
468 if (!has_common) {
469 if (candidate->is_bare != -1) {
470 is_bare_repository_cfg = candidate->is_bare;
471 if (is_bare_repository_cfg == 1)
472 inside_work_tree = -1;
473 }
474 if (candidate->work_tree) {
475 free(git_work_tree_cfg);
476 git_work_tree_cfg = candidate->work_tree;
477 inside_work_tree = -1;
478 }
479 } else {
480 free(candidate->work_tree);
481 }
482
483 return 0;
484 }
485
486 int read_repository_format(struct repository_format *format, const char *path)
487 {
488 memset(format, 0, sizeof(*format));
489 format->version = -1;
490 format->is_bare = -1;
491 format->hash_algo = GIT_HASH_SHA1;
492 string_list_init(&format->unknown_extensions, 1);
493 git_config_from_file(check_repo_format, path, format);
494 return format->version;
495 }
496
497 int verify_repository_format(const struct repository_format *format,
498 struct strbuf *err)
499 {
500 if (GIT_REPO_VERSION_READ < format->version) {
501 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
502 GIT_REPO_VERSION_READ, format->version);
503 return -1;
504 }
505
506 if (format->version >= 1 && format->unknown_extensions.nr) {
507 int i;
508
509 strbuf_addstr(err, _("unknown repository extensions found:"));
510
511 for (i = 0; i < format->unknown_extensions.nr; i++)
512 strbuf_addf(err, "\n\t%s",
513 format->unknown_extensions.items[i].string);
514 return -1;
515 }
516
517 return 0;
518 }
519
520 void read_gitfile_error_die(int error_code, const char *path, const char *dir)
521 {
522 switch (error_code) {
523 case READ_GITFILE_ERR_STAT_FAILED:
524 case READ_GITFILE_ERR_NOT_A_FILE:
525 /* non-fatal; follow return path */
526 break;
527 case READ_GITFILE_ERR_OPEN_FAILED:
528 die_errno("Error opening '%s'", path);
529 case READ_GITFILE_ERR_TOO_LARGE:
530 die("Too large to be a .git file: '%s'", path);
531 case READ_GITFILE_ERR_READ_FAILED:
532 die("Error reading %s", path);
533 case READ_GITFILE_ERR_INVALID_FORMAT:
534 die("Invalid gitfile format: %s", path);
535 case READ_GITFILE_ERR_NO_PATH:
536 die("No path in gitfile: %s", path);
537 case READ_GITFILE_ERR_NOT_A_REPO:
538 die("Not a git repository: %s", dir);
539 default:
540 die("BUG: unknown error code");
541 }
542 }
543
544 /*
545 * Try to read the location of the git directory from the .git file,
546 * return path to git directory if found. The return value comes from
547 * a shared buffer.
548 *
549 * On failure, if return_error_code is not NULL, return_error_code
550 * will be set to an error code and NULL will be returned. If
551 * return_error_code is NULL the function will die instead (for most
552 * cases).
553 */
554 const char *read_gitfile_gently(const char *path, int *return_error_code)
555 {
556 const int max_file_size = 1 << 20; /* 1MB */
557 int error_code = 0;
558 char *buf = NULL;
559 char *dir = NULL;
560 const char *slash;
561 struct stat st;
562 int fd;
563 ssize_t len;
564
565 if (stat(path, &st)) {
566 /* NEEDSWORK: discern between ENOENT vs other errors */
567 error_code = READ_GITFILE_ERR_STAT_FAILED;
568 goto cleanup_return;
569 }
570 if (!S_ISREG(st.st_mode)) {
571 error_code = READ_GITFILE_ERR_NOT_A_FILE;
572 goto cleanup_return;
573 }
574 if (st.st_size > max_file_size) {
575 error_code = READ_GITFILE_ERR_TOO_LARGE;
576 goto cleanup_return;
577 }
578 fd = open(path, O_RDONLY);
579 if (fd < 0) {
580 error_code = READ_GITFILE_ERR_OPEN_FAILED;
581 goto cleanup_return;
582 }
583 buf = xmallocz(st.st_size);
584 len = read_in_full(fd, buf, st.st_size);
585 close(fd);
586 if (len != st.st_size) {
587 error_code = READ_GITFILE_ERR_READ_FAILED;
588 goto cleanup_return;
589 }
590 if (!starts_with(buf, "gitdir: ")) {
591 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
592 goto cleanup_return;
593 }
594 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
595 len--;
596 if (len < 9) {
597 error_code = READ_GITFILE_ERR_NO_PATH;
598 goto cleanup_return;
599 }
600 buf[len] = '\0';
601 dir = buf + 8;
602
603 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
604 size_t pathlen = slash+1 - path;
605 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
606 (int)(len - 8), buf + 8);
607 free(buf);
608 buf = dir;
609 }
610 if (!is_git_directory(dir)) {
611 error_code = READ_GITFILE_ERR_NOT_A_REPO;
612 goto cleanup_return;
613 }
614 path = real_path(dir);
615
616 cleanup_return:
617 if (return_error_code)
618 *return_error_code = error_code;
619 else if (error_code)
620 read_gitfile_error_die(error_code, path, dir);
621
622 free(buf);
623 return error_code ? NULL : path;
624 }
625
626 static const char *setup_explicit_git_dir(const char *gitdirenv,
627 struct strbuf *cwd,
628 struct repository_format *repo_fmt,
629 int *nongit_ok)
630 {
631 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
632 const char *worktree;
633 char *gitfile;
634 int offset;
635
636 if (PATH_MAX - 40 < strlen(gitdirenv))
637 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
638
639 gitfile = (char*)read_gitfile(gitdirenv);
640 if (gitfile) {
641 gitfile = xstrdup(gitfile);
642 gitdirenv = gitfile;
643 }
644
645 if (!is_git_directory(gitdirenv)) {
646 if (nongit_ok) {
647 *nongit_ok = 1;
648 free(gitfile);
649 return NULL;
650 }
651 die("Not a git repository: '%s'", gitdirenv);
652 }
653
654 if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) {
655 free(gitfile);
656 return NULL;
657 }
658
659 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
660 if (work_tree_env)
661 set_git_work_tree(work_tree_env);
662 else if (is_bare_repository_cfg > 0) {
663 if (git_work_tree_cfg) {
664 /* #22.2, #30 */
665 warning("core.bare and core.worktree do not make sense");
666 work_tree_config_is_bogus = 1;
667 }
668
669 /* #18, #26 */
670 set_git_dir(gitdirenv);
671 free(gitfile);
672 return NULL;
673 }
674 else if (git_work_tree_cfg) { /* #6, #14 */
675 if (is_absolute_path(git_work_tree_cfg))
676 set_git_work_tree(git_work_tree_cfg);
677 else {
678 char *core_worktree;
679 if (chdir(gitdirenv))
680 die_errno("Could not chdir to '%s'", gitdirenv);
681 if (chdir(git_work_tree_cfg))
682 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
683 core_worktree = xgetcwd();
684 if (chdir(cwd->buf))
685 die_errno("Could not come back to cwd");
686 set_git_work_tree(core_worktree);
687 free(core_worktree);
688 }
689 }
690 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
691 /* #16d */
692 set_git_dir(gitdirenv);
693 free(gitfile);
694 return NULL;
695 }
696 else /* #2, #10 */
697 set_git_work_tree(".");
698
699 /* set_git_work_tree() must have been called by now */
700 worktree = get_git_work_tree();
701
702 /* both get_git_work_tree() and cwd are already normalized */
703 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
704 set_git_dir(gitdirenv);
705 free(gitfile);
706 return NULL;
707 }
708
709 offset = dir_inside_of(cwd->buf, worktree);
710 if (offset >= 0) { /* cwd inside worktree? */
711 set_git_dir(real_path(gitdirenv));
712 if (chdir(worktree))
713 die_errno("Could not chdir to '%s'", worktree);
714 strbuf_addch(cwd, '/');
715 free(gitfile);
716 return cwd->buf + offset;
717 }
718
719 /* cwd outside worktree */
720 set_git_dir(gitdirenv);
721 free(gitfile);
722 return NULL;
723 }
724
725 static const char *setup_discovered_git_dir(const char *gitdir,
726 struct strbuf *cwd, int offset,
727 struct repository_format *repo_fmt,
728 int *nongit_ok)
729 {
730 if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok))
731 return NULL;
732
733 /* --work-tree is set without --git-dir; use discovered one */
734 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
735 char *to_free = NULL;
736 const char *ret;
737
738 if (offset != cwd->len && !is_absolute_path(gitdir))
739 gitdir = to_free = real_pathdup(gitdir, 1);
740 if (chdir(cwd->buf))
741 die_errno("Could not come back to cwd");
742 ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
743 free(to_free);
744 return ret;
745 }
746
747 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
748 if (is_bare_repository_cfg > 0) {
749 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
750 if (chdir(cwd->buf))
751 die_errno("Could not come back to cwd");
752 return NULL;
753 }
754
755 /* #0, #1, #5, #8, #9, #12, #13 */
756 set_git_work_tree(".");
757 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
758 set_git_dir(gitdir);
759 inside_git_dir = 0;
760 inside_work_tree = 1;
761 if (offset == cwd->len)
762 return NULL;
763
764 /* Make "offset" point past the '/' (already the case for root dirs) */
765 if (offset != offset_1st_component(cwd->buf))
766 offset++;
767 /* Add a '/' at the end */
768 strbuf_addch(cwd, '/');
769 return cwd->buf + offset;
770 }
771
772 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
773 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
774 struct repository_format *repo_fmt,
775 int *nongit_ok)
776 {
777 int root_len;
778
779 if (check_repository_format_gently(".", repo_fmt, nongit_ok))
780 return NULL;
781
782 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
783
784 /* --work-tree is set without --git-dir; use discovered one */
785 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
786 static const char *gitdir;
787
788 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
789 if (chdir(cwd->buf))
790 die_errno("Could not come back to cwd");
791 return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
792 }
793
794 inside_git_dir = 1;
795 inside_work_tree = 0;
796 if (offset != cwd->len) {
797 if (chdir(cwd->buf))
798 die_errno("Cannot come back to cwd");
799 root_len = offset_1st_component(cwd->buf);
800 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
801 set_git_dir(cwd->buf);
802 }
803 else
804 set_git_dir(".");
805 return NULL;
806 }
807
808 static const char *setup_nongit(const char *cwd, int *nongit_ok)
809 {
810 if (!nongit_ok)
811 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
812 if (chdir(cwd))
813 die_errno(_("Cannot come back to cwd"));
814 *nongit_ok = 1;
815 return NULL;
816 }
817
818 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
819 {
820 struct stat buf;
821 if (stat(path, &buf)) {
822 die_errno("failed to stat '%*s%s%s'",
823 prefix_len,
824 prefix ? prefix : "",
825 prefix ? "/" : "", path);
826 }
827 return buf.st_dev;
828 }
829
830 /*
831 * A "string_list_each_func_t" function that canonicalizes an entry
832 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
833 * discards it if unusable. The presence of an empty entry in
834 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
835 * subsequent entries.
836 */
837 static int canonicalize_ceiling_entry(struct string_list_item *item,
838 void *cb_data)
839 {
840 int *empty_entry_found = cb_data;
841 char *ceil = item->string;
842
843 if (!*ceil) {
844 *empty_entry_found = 1;
845 return 0;
846 } else if (!is_absolute_path(ceil)) {
847 return 0;
848 } else if (*empty_entry_found) {
849 /* Keep entry but do not canonicalize it */
850 return 1;
851 } else {
852 char *real_path = real_pathdup(ceil, 0);
853 if (!real_path) {
854 return 0;
855 }
856 free(item->string);
857 item->string = real_path;
858 return 1;
859 }
860 }
861
862 enum discovery_result {
863 GIT_DIR_NONE = 0,
864 GIT_DIR_EXPLICIT,
865 GIT_DIR_DISCOVERED,
866 GIT_DIR_BARE,
867 /* these are errors */
868 GIT_DIR_HIT_CEILING = -1,
869 GIT_DIR_HIT_MOUNT_POINT = -2,
870 GIT_DIR_INVALID_GITFILE = -3
871 };
872
873 /*
874 * We cannot decide in this function whether we are in the work tree or
875 * not, since the config can only be read _after_ this function was called.
876 *
877 * Also, we avoid changing any global state (such as the current working
878 * directory) to allow early callers.
879 *
880 * The directory where the search should start needs to be passed in via the
881 * `dir` parameter; upon return, the `dir` buffer will contain the path of
882 * the directory where the search ended, and `gitdir` will contain the path of
883 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
884 * is relative to `dir` (i.e. *not* necessarily the cwd).
885 */
886 static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
887 struct strbuf *gitdir,
888 int die_on_error)
889 {
890 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
891 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
892 const char *gitdirenv;
893 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
894 dev_t current_device = 0;
895 int one_filesystem = 1;
896
897 /*
898 * If GIT_DIR is set explicitly, we're not going
899 * to do any discovery, but we still do repository
900 * validation.
901 */
902 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
903 if (gitdirenv) {
904 strbuf_addstr(gitdir, gitdirenv);
905 return GIT_DIR_EXPLICIT;
906 }
907
908 if (env_ceiling_dirs) {
909 int empty_entry_found = 0;
910
911 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
912 filter_string_list(&ceiling_dirs, 0,
913 canonicalize_ceiling_entry, &empty_entry_found);
914 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
915 string_list_clear(&ceiling_dirs, 0);
916 }
917
918 if (ceil_offset < 0)
919 ceil_offset = min_offset - 2;
920
921 /*
922 * Test in the following order (relative to the dir):
923 * - .git (file containing "gitdir: <path>")
924 * - .git/
925 * - ./ (bare)
926 * - ../.git
927 * - ../.git/
928 * - ../ (bare)
929 * - ../../.git/
930 * etc.
931 */
932 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
933 if (one_filesystem)
934 current_device = get_device_or_die(dir->buf, NULL, 0);
935 for (;;) {
936 int offset = dir->len, error_code = 0;
937
938 if (offset > min_offset)
939 strbuf_addch(dir, '/');
940 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
941 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
942 NULL : &error_code);
943 if (!gitdirenv) {
944 if (die_on_error ||
945 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
946 /* NEEDSWORK: fail if .git is not file nor dir */
947 if (is_git_directory(dir->buf))
948 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
949 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
950 return GIT_DIR_INVALID_GITFILE;
951 }
952 strbuf_setlen(dir, offset);
953 if (gitdirenv) {
954 strbuf_addstr(gitdir, gitdirenv);
955 return GIT_DIR_DISCOVERED;
956 }
957
958 if (is_git_directory(dir->buf)) {
959 strbuf_addstr(gitdir, ".");
960 return GIT_DIR_BARE;
961 }
962
963 if (offset <= min_offset)
964 return GIT_DIR_HIT_CEILING;
965
966 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
967 ; /* continue */
968 if (offset <= ceil_offset)
969 return GIT_DIR_HIT_CEILING;
970
971 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
972 if (one_filesystem &&
973 current_device != get_device_or_die(dir->buf, NULL, offset))
974 return GIT_DIR_HIT_MOUNT_POINT;
975 }
976 }
977
978 int discover_git_directory(struct strbuf *commondir,
979 struct strbuf *gitdir)
980 {
981 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
982 size_t gitdir_offset = gitdir->len, cwd_len;
983 size_t commondir_offset = commondir->len;
984 struct repository_format candidate;
985
986 if (strbuf_getcwd(&dir))
987 return -1;
988
989 cwd_len = dir.len;
990 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
991 strbuf_release(&dir);
992 return -1;
993 }
994
995 /*
996 * The returned gitdir is relative to dir, and if dir does not reflect
997 * the current working directory, we simply make the gitdir absolute.
998 */
999 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
1000 /* Avoid a trailing "/." */
1001 if (!strcmp(".", gitdir->buf + gitdir_offset))
1002 strbuf_setlen(gitdir, gitdir_offset);
1003 else
1004 strbuf_addch(&dir, '/');
1005 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1006 }
1007
1008 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1009
1010 strbuf_reset(&dir);
1011 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
1012 read_repository_format(&candidate, dir.buf);
1013 strbuf_release(&dir);
1014
1015 if (verify_repository_format(&candidate, &err) < 0) {
1016 warning("ignoring git dir '%s': %s",
1017 gitdir->buf + gitdir_offset, err.buf);
1018 strbuf_release(&err);
1019 strbuf_setlen(commondir, commondir_offset);
1020 strbuf_setlen(gitdir, gitdir_offset);
1021 return -1;
1022 }
1023
1024 return 0;
1025 }
1026
1027 const char *setup_git_directory_gently(int *nongit_ok)
1028 {
1029 static struct strbuf cwd = STRBUF_INIT;
1030 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
1031 const char *prefix;
1032 struct repository_format repo_fmt;
1033
1034 /*
1035 * We may have read an incomplete configuration before
1036 * setting-up the git directory. If so, clear the cache so
1037 * that the next queries to the configuration reload complete
1038 * configuration (including the per-repo config file that we
1039 * ignored previously).
1040 */
1041 git_config_clear();
1042
1043 /*
1044 * Let's assume that we are in a git repository.
1045 * If it turns out later that we are somewhere else, the value will be
1046 * updated accordingly.
1047 */
1048 if (nongit_ok)
1049 *nongit_ok = 0;
1050
1051 if (strbuf_getcwd(&cwd))
1052 die_errno(_("Unable to read current working directory"));
1053 strbuf_addbuf(&dir, &cwd);
1054
1055 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
1056 case GIT_DIR_NONE:
1057 prefix = NULL;
1058 break;
1059 case GIT_DIR_EXPLICIT:
1060 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok);
1061 break;
1062 case GIT_DIR_DISCOVERED:
1063 if (dir.len < cwd.len && chdir(dir.buf))
1064 die(_("Cannot change to '%s'"), dir.buf);
1065 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1066 &repo_fmt, nongit_ok);
1067 break;
1068 case GIT_DIR_BARE:
1069 if (dir.len < cwd.len && chdir(dir.buf))
1070 die(_("Cannot change to '%s'"), dir.buf);
1071 prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok);
1072 break;
1073 case GIT_DIR_HIT_CEILING:
1074 prefix = setup_nongit(cwd.buf, nongit_ok);
1075 break;
1076 case GIT_DIR_HIT_MOUNT_POINT:
1077 if (nongit_ok) {
1078 *nongit_ok = 1;
1079 strbuf_release(&cwd);
1080 strbuf_release(&dir);
1081 return NULL;
1082 }
1083 die(_("Not a git repository (or any parent up to mount point %s)\n"
1084 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1085 dir.buf);
1086 default:
1087 die("BUG: unhandled setup_git_directory_1() result");
1088 }
1089
1090 if (prefix)
1091 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1092 else
1093 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1094
1095 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1096 startup_info->prefix = prefix;
1097
1098 /*
1099 * Not all paths through the setup code will call 'set_git_dir()' (which
1100 * directly sets up the environment) so in order to guarantee that the
1101 * environment is in a consistent state after setup, explicitly setup
1102 * the environment if we have a repository.
1103 *
1104 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some
1105 * code paths so we also need to explicitly setup the environment if
1106 * the user has set GIT_DIR. It may be beneficial to disallow bogus
1107 * GIT_DIR values at some point in the future.
1108 */
1109 if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)) {
1110 if (!the_repository->gitdir) {
1111 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1112 if (!gitdir)
1113 gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
1114 repo_set_gitdir(the_repository, gitdir);
1115 setup_git_env();
1116 }
1117 if (startup_info->have_repository)
1118 repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
1119 }
1120
1121 strbuf_release(&dir);
1122 strbuf_release(&gitdir);
1123
1124 return prefix;
1125 }
1126
1127 int git_config_perm(const char *var, const char *value)
1128 {
1129 int i;
1130 char *endptr;
1131
1132 if (value == NULL)
1133 return PERM_GROUP;
1134
1135 if (!strcmp(value, "umask"))
1136 return PERM_UMASK;
1137 if (!strcmp(value, "group"))
1138 return PERM_GROUP;
1139 if (!strcmp(value, "all") ||
1140 !strcmp(value, "world") ||
1141 !strcmp(value, "everybody"))
1142 return PERM_EVERYBODY;
1143
1144 /* Parse octal numbers */
1145 i = strtol(value, &endptr, 8);
1146
1147 /* If not an octal number, maybe true/false? */
1148 if (*endptr != 0)
1149 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1150
1151 /*
1152 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
1153 * a chmod value to restrict to.
1154 */
1155 switch (i) {
1156 case PERM_UMASK: /* 0 */
1157 return PERM_UMASK;
1158 case OLD_PERM_GROUP: /* 1 */
1159 return PERM_GROUP;
1160 case OLD_PERM_EVERYBODY: /* 2 */
1161 return PERM_EVERYBODY;
1162 }
1163
1164 /* A filemode value was given: 0xxx */
1165
1166 if ((i & 0600) != 0600)
1167 die(_("Problem with core.sharedRepository filemode value "
1168 "(0%.3o).\nThe owner of files must always have "
1169 "read and write permissions."), i);
1170
1171 /*
1172 * Mask filemode value. Others can not get write permission.
1173 * x flags for directories are handled separately.
1174 */
1175 return -(i & 0666);
1176 }
1177
1178 void check_repository_format(void)
1179 {
1180 struct repository_format repo_fmt;
1181 check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
1182 startup_info->have_repository = 1;
1183 }
1184
1185 /*
1186 * Returns the "prefix", a path to the current working directory
1187 * relative to the work tree root, or NULL, if the current working
1188 * directory is not a strict subdirectory of the work tree root. The
1189 * prefix always ends with a '/' character.
1190 */
1191 const char *setup_git_directory(void)
1192 {
1193 return setup_git_directory_gently(NULL);
1194 }
1195
1196 const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
1197 {
1198 if (is_git_directory(suspect))
1199 return suspect;
1200 return read_gitfile_gently(suspect, return_error_code);
1201 }
1202
1203 /* if any standard file descriptor is missing open it to /dev/null */
1204 void sanitize_stdfds(void)
1205 {
1206 int fd = open("/dev/null", O_RDWR, 0);
1207 while (fd != -1 && fd < 2)
1208 fd = dup(fd);
1209 if (fd == -1)
1210 die_errno("open /dev/null or dup failed");
1211 if (fd > 2)
1212 close(fd);
1213 }
1214
1215 int daemonize(void)
1216 {
1217 #ifdef NO_POSIX_GOODIES
1218 errno = ENOSYS;
1219 return -1;
1220 #else
1221 switch (fork()) {
1222 case 0:
1223 break;
1224 case -1:
1225 die_errno("fork failed");
1226 default:
1227 exit(0);
1228 }
1229 if (setsid() == -1)
1230 die_errno("setsid failed");
1231 close(0);
1232 close(1);
1233 close(2);
1234 sanitize_stdfds();
1235 return 0;
1236 #endif
1237 }