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1 | #include "cache.h" | |
2 | #include "dir.h" | |
3 | #include "string-list.h" | |
4 | ||
5 | static int inside_git_dir = -1; | |
6 | static int inside_work_tree = -1; | |
7 | static int work_tree_config_is_bogus; | |
8 | static struct string_list unknown_extensions = STRING_LIST_INIT_DUP; | |
9 | ||
10 | /* | |
11 | * The input parameter must contain an absolute path, and it must already be | |
12 | * normalized. | |
13 | * | |
14 | * Find the part of an absolute path that lies inside the work tree by | |
15 | * dereferencing symlinks outside the work tree, for example: | |
16 | * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file | |
17 | * /dir/file (work tree is /) -> dir/file | |
18 | * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2 | |
19 | * /dir/repolink/file (repolink points to /dir/repo) -> file | |
20 | * /dir/repo (exactly equal to work tree) -> (empty string) | |
21 | */ | |
22 | static int abspath_part_inside_repo(char *path) | |
23 | { | |
24 | size_t len; | |
25 | size_t wtlen; | |
26 | char *path0; | |
27 | int off; | |
28 | const char *work_tree = get_git_work_tree(); | |
29 | ||
30 | if (!work_tree) | |
31 | return -1; | |
32 | wtlen = strlen(work_tree); | |
33 | len = strlen(path); | |
34 | off = offset_1st_component(path); | |
35 | ||
36 | /* check if work tree is already the prefix */ | |
37 | if (wtlen <= len && !strncmp(path, work_tree, wtlen)) { | |
38 | if (path[wtlen] == '/') { | |
39 | memmove(path, path + wtlen + 1, len - wtlen); | |
40 | return 0; | |
41 | } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') { | |
42 | /* work tree is the root, or the whole path */ | |
43 | memmove(path, path + wtlen, len - wtlen + 1); | |
44 | return 0; | |
45 | } | |
46 | /* work tree might match beginning of a symlink to work tree */ | |
47 | off = wtlen; | |
48 | } | |
49 | path0 = path; | |
50 | path += off; | |
51 | ||
52 | /* check each '/'-terminated level */ | |
53 | while (*path) { | |
54 | path++; | |
55 | if (*path == '/') { | |
56 | *path = '\0'; | |
57 | if (strcmp(real_path(path0), work_tree) == 0) { | |
58 | memmove(path0, path + 1, len - (path - path0)); | |
59 | return 0; | |
60 | } | |
61 | *path = '/'; | |
62 | } | |
63 | } | |
64 | ||
65 | /* check whole path */ | |
66 | if (strcmp(real_path(path0), work_tree) == 0) { | |
67 | *path0 = '\0'; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | return -1; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Normalize "path", prepending the "prefix" for relative paths. If | |
76 | * remaining_prefix is not NULL, return the actual prefix still | |
77 | * remains in the path. For example, prefix = sub1/sub2/ and path is | |
78 | * | |
79 | * foo -> sub1/sub2/foo (full prefix) | |
80 | * ../foo -> sub1/foo (remaining prefix is sub1/) | |
81 | * ../../bar -> bar (no remaining prefix) | |
82 | * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) | |
83 | * `pwd`/../bar -> sub1/bar (no remaining prefix) | |
84 | */ | |
85 | char *prefix_path_gently(const char *prefix, int len, | |
86 | int *remaining_prefix, const char *path) | |
87 | { | |
88 | const char *orig = path; | |
89 | char *sanitized; | |
90 | if (is_absolute_path(orig)) { | |
91 | sanitized = xmalloc(strlen(path) + 1); | |
92 | if (remaining_prefix) | |
93 | *remaining_prefix = 0; | |
94 | if (normalize_path_copy_len(sanitized, path, remaining_prefix)) { | |
95 | free(sanitized); | |
96 | return NULL; | |
97 | } | |
98 | if (abspath_part_inside_repo(sanitized)) { | |
99 | free(sanitized); | |
100 | return NULL; | |
101 | } | |
102 | } else { | |
103 | sanitized = xmalloc(len + strlen(path) + 1); | |
104 | if (len) | |
105 | memcpy(sanitized, prefix, len); | |
106 | strcpy(sanitized + len, path); | |
107 | if (remaining_prefix) | |
108 | *remaining_prefix = len; | |
109 | if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { | |
110 | free(sanitized); | |
111 | return NULL; | |
112 | } | |
113 | } | |
114 | return sanitized; | |
115 | } | |
116 | ||
117 | char *prefix_path(const char *prefix, int len, const char *path) | |
118 | { | |
119 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
120 | if (!r) | |
121 | die("'%s' is outside repository", path); | |
122 | return r; | |
123 | } | |
124 | ||
125 | int path_inside_repo(const char *prefix, const char *path) | |
126 | { | |
127 | int len = prefix ? strlen(prefix) : 0; | |
128 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
129 | if (r) { | |
130 | free(r); | |
131 | return 1; | |
132 | } | |
133 | return 0; | |
134 | } | |
135 | ||
136 | int check_filename(const char *prefix, const char *arg) | |
137 | { | |
138 | const char *name; | |
139 | struct stat st; | |
140 | ||
141 | if (starts_with(arg, ":/")) { | |
142 | if (arg[2] == '\0') /* ":/" is root dir, always exists */ | |
143 | return 1; | |
144 | name = arg + 2; | |
145 | } else if (!no_wildcard(arg)) | |
146 | return 1; | |
147 | else if (prefix) | |
148 | name = prefix_filename(prefix, strlen(prefix), arg); | |
149 | else | |
150 | name = arg; | |
151 | if (!lstat(name, &st)) | |
152 | return 1; /* file exists */ | |
153 | if (errno == ENOENT || errno == ENOTDIR) | |
154 | return 0; /* file does not exist */ | |
155 | die_errno("failed to stat '%s'", arg); | |
156 | } | |
157 | ||
158 | static void NORETURN die_verify_filename(const char *prefix, | |
159 | const char *arg, | |
160 | int diagnose_misspelt_rev) | |
161 | { | |
162 | if (!diagnose_misspelt_rev) | |
163 | die("%s: no such path in the working tree.\n" | |
164 | "Use 'git <command> -- <path>...' to specify paths that do not exist locally.", | |
165 | arg); | |
166 | /* | |
167 | * Saying "'(icase)foo' does not exist in the index" when the | |
168 | * user gave us ":(icase)foo" is just stupid. A magic pathspec | |
169 | * begins with a colon and is followed by a non-alnum; do not | |
170 | * let maybe_die_on_misspelt_object_name() even trigger. | |
171 | */ | |
172 | if (!(arg[0] == ':' && !isalnum(arg[1]))) | |
173 | maybe_die_on_misspelt_object_name(arg, prefix); | |
174 | ||
175 | /* ... or fall back the most general message. */ | |
176 | die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" | |
177 | "Use '--' to separate paths from revisions, like this:\n" | |
178 | "'git <command> [<revision>...] -- [<file>...]'", arg); | |
179 | ||
180 | } | |
181 | ||
182 | /* | |
183 | * Verify a filename that we got as an argument for a pathspec | |
184 | * entry. Note that a filename that begins with "-" never verifies | |
185 | * as true, because even if such a filename were to exist, we want | |
186 | * it to be preceded by the "--" marker (or we want the user to | |
187 | * use a format like "./-filename") | |
188 | * | |
189 | * The "diagnose_misspelt_rev" is used to provide a user-friendly | |
190 | * diagnosis when dying upon finding that "name" is not a pathname. | |
191 | * If set to 1, the diagnosis will try to diagnose "name" as an | |
192 | * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis | |
193 | * will only complain about an inexisting file. | |
194 | * | |
195 | * This function is typically called to check that a "file or rev" | |
196 | * argument is unambiguous. In this case, the caller will want | |
197 | * diagnose_misspelt_rev == 1 when verifying the first non-rev | |
198 | * argument (which could have been a revision), and | |
199 | * diagnose_misspelt_rev == 0 for the next ones (because we already | |
200 | * saw a filename, there's not ambiguity anymore). | |
201 | */ | |
202 | void verify_filename(const char *prefix, | |
203 | const char *arg, | |
204 | int diagnose_misspelt_rev) | |
205 | { | |
206 | if (*arg == '-') | |
207 | die("bad flag '%s' used after filename", arg); | |
208 | if (check_filename(prefix, arg)) | |
209 | return; | |
210 | die_verify_filename(prefix, arg, diagnose_misspelt_rev); | |
211 | } | |
212 | ||
213 | /* | |
214 | * Opposite of the above: the command line did not have -- marker | |
215 | * and we parsed the arg as a refname. It should not be interpretable | |
216 | * as a filename. | |
217 | */ | |
218 | void verify_non_filename(const char *prefix, const char *arg) | |
219 | { | |
220 | if (!is_inside_work_tree() || is_inside_git_dir()) | |
221 | return; | |
222 | if (*arg == '-') | |
223 | return; /* flag */ | |
224 | if (!check_filename(prefix, arg)) | |
225 | return; | |
226 | die("ambiguous argument '%s': both revision and filename\n" | |
227 | "Use '--' to separate paths from revisions, like this:\n" | |
228 | "'git <command> [<revision>...] -- [<file>...]'", arg); | |
229 | } | |
230 | ||
231 | int get_common_dir(struct strbuf *sb, const char *gitdir) | |
232 | { | |
233 | struct strbuf data = STRBUF_INIT; | |
234 | struct strbuf path = STRBUF_INIT; | |
235 | const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT); | |
236 | int ret = 0; | |
237 | if (git_common_dir) { | |
238 | strbuf_addstr(sb, git_common_dir); | |
239 | return 1; | |
240 | } | |
241 | strbuf_addf(&path, "%s/commondir", gitdir); | |
242 | if (file_exists(path.buf)) { | |
243 | if (strbuf_read_file(&data, path.buf, 0) <= 0) | |
244 | die_errno(_("failed to read %s"), path.buf); | |
245 | while (data.len && (data.buf[data.len - 1] == '\n' || | |
246 | data.buf[data.len - 1] == '\r')) | |
247 | data.len--; | |
248 | data.buf[data.len] = '\0'; | |
249 | strbuf_reset(&path); | |
250 | if (!is_absolute_path(data.buf)) | |
251 | strbuf_addf(&path, "%s/", gitdir); | |
252 | strbuf_addbuf(&path, &data); | |
253 | strbuf_addstr(sb, real_path(path.buf)); | |
254 | ret = 1; | |
255 | } else | |
256 | strbuf_addstr(sb, gitdir); | |
257 | strbuf_release(&data); | |
258 | strbuf_release(&path); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Test if it looks like we're at a git directory. | |
264 | * We want to see: | |
265 | * | |
266 | * - either an objects/ directory _or_ the proper | |
267 | * GIT_OBJECT_DIRECTORY environment variable | |
268 | * - a refs/ directory | |
269 | * - either a HEAD symlink or a HEAD file that is formatted as | |
270 | * a proper "ref:", or a regular file HEAD that has a properly | |
271 | * formatted sha1 object name. | |
272 | */ | |
273 | int is_git_directory(const char *suspect) | |
274 | { | |
275 | struct strbuf path = STRBUF_INIT; | |
276 | int ret = 0; | |
277 | size_t len; | |
278 | ||
279 | /* Check worktree-related signatures */ | |
280 | strbuf_addf(&path, "%s/HEAD", suspect); | |
281 | if (validate_headref(path.buf)) | |
282 | goto done; | |
283 | ||
284 | strbuf_reset(&path); | |
285 | get_common_dir(&path, suspect); | |
286 | len = path.len; | |
287 | ||
288 | /* Check non-worktree-related signatures */ | |
289 | if (getenv(DB_ENVIRONMENT)) { | |
290 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
291 | goto done; | |
292 | } | |
293 | else { | |
294 | strbuf_setlen(&path, len); | |
295 | strbuf_addstr(&path, "/objects"); | |
296 | if (access(path.buf, X_OK)) | |
297 | goto done; | |
298 | } | |
299 | ||
300 | strbuf_setlen(&path, len); | |
301 | strbuf_addstr(&path, "/refs"); | |
302 | if (access(path.buf, X_OK)) | |
303 | goto done; | |
304 | ||
305 | ret = 1; | |
306 | done: | |
307 | strbuf_release(&path); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | int is_inside_git_dir(void) | |
312 | { | |
313 | if (inside_git_dir < 0) | |
314 | inside_git_dir = is_inside_dir(get_git_dir()); | |
315 | return inside_git_dir; | |
316 | } | |
317 | ||
318 | int is_inside_work_tree(void) | |
319 | { | |
320 | if (inside_work_tree < 0) | |
321 | inside_work_tree = is_inside_dir(get_git_work_tree()); | |
322 | return inside_work_tree; | |
323 | } | |
324 | ||
325 | void setup_work_tree(void) | |
326 | { | |
327 | const char *work_tree, *git_dir; | |
328 | static int initialized = 0; | |
329 | ||
330 | if (initialized) | |
331 | return; | |
332 | ||
333 | if (work_tree_config_is_bogus) | |
334 | die("unable to set up work tree using invalid config"); | |
335 | ||
336 | work_tree = get_git_work_tree(); | |
337 | git_dir = get_git_dir(); | |
338 | if (!is_absolute_path(git_dir)) | |
339 | git_dir = real_path(get_git_dir()); | |
340 | if (!work_tree || chdir(work_tree)) | |
341 | die("This operation must be run in a work tree"); | |
342 | ||
343 | /* | |
344 | * Make sure subsequent git processes find correct worktree | |
345 | * if $GIT_WORK_TREE is set relative | |
346 | */ | |
347 | if (getenv(GIT_WORK_TREE_ENVIRONMENT)) | |
348 | setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); | |
349 | ||
350 | set_git_dir(remove_leading_path(git_dir, work_tree)); | |
351 | initialized = 1; | |
352 | } | |
353 | ||
354 | static int check_repo_format(const char *var, const char *value, void *cb) | |
355 | { | |
356 | const char *ext; | |
357 | ||
358 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
359 | repository_format_version = git_config_int(var, value); | |
360 | else if (strcmp(var, "core.sharedrepository") == 0) | |
361 | shared_repository = git_config_perm(var, value); | |
362 | else if (skip_prefix(var, "extensions.", &ext)) { | |
363 | /* | |
364 | * record any known extensions here; otherwise, | |
365 | * we fall through to recording it as unknown, and | |
366 | * check_repository_format will complain | |
367 | */ | |
368 | if (!strcmp(ext, "noop")) | |
369 | ; | |
370 | else | |
371 | string_list_append(&unknown_extensions, ext); | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int check_repository_format_gently(const char *gitdir, int *nongit_ok) | |
377 | { | |
378 | struct strbuf sb = STRBUF_INIT; | |
379 | const char *repo_config; | |
380 | config_fn_t fn; | |
381 | int ret = 0; | |
382 | ||
383 | string_list_clear(&unknown_extensions, 0); | |
384 | ||
385 | if (get_common_dir(&sb, gitdir)) | |
386 | fn = check_repo_format; | |
387 | else | |
388 | fn = check_repository_format_version; | |
389 | strbuf_addstr(&sb, "/config"); | |
390 | repo_config = sb.buf; | |
391 | ||
392 | /* | |
393 | * git_config() can't be used here because it calls git_pathdup() | |
394 | * to get $GIT_CONFIG/config. That call will make setup_git_env() | |
395 | * set git_dir to ".git". | |
396 | * | |
397 | * We are in gitdir setup, no git dir has been found useable yet. | |
398 | * Use a gentler version of git_config() to check if this repo | |
399 | * is a good one. | |
400 | */ | |
401 | git_config_early(fn, NULL, repo_config); | |
402 | if (GIT_REPO_VERSION_READ < repository_format_version) { | |
403 | if (!nongit_ok) | |
404 | die ("Expected git repo version <= %d, found %d", | |
405 | GIT_REPO_VERSION_READ, repository_format_version); | |
406 | warning("Expected git repo version <= %d, found %d", | |
407 | GIT_REPO_VERSION_READ, repository_format_version); | |
408 | warning("Please upgrade Git"); | |
409 | *nongit_ok = -1; | |
410 | ret = -1; | |
411 | } | |
412 | ||
413 | if (repository_format_version >= 1 && unknown_extensions.nr) { | |
414 | int i; | |
415 | ||
416 | if (!nongit_ok) | |
417 | die("unknown repository extension: %s", | |
418 | unknown_extensions.items[0].string); | |
419 | ||
420 | for (i = 0; i < unknown_extensions.nr; i++) | |
421 | warning("unknown repository extension: %s", | |
422 | unknown_extensions.items[i].string); | |
423 | *nongit_ok = -1; | |
424 | ret = -1; | |
425 | } | |
426 | ||
427 | strbuf_release(&sb); | |
428 | return ret; | |
429 | } | |
430 | ||
431 | static void update_linked_gitdir(const char *gitfile, const char *gitdir) | |
432 | { | |
433 | struct strbuf path = STRBUF_INIT; | |
434 | struct stat st; | |
435 | ||
436 | strbuf_addf(&path, "%s/gitfile", gitdir); | |
437 | if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL)) | |
438 | write_file(path.buf, 0, "%s\n", gitfile); | |
439 | strbuf_release(&path); | |
440 | } | |
441 | ||
442 | /* | |
443 | * Try to read the location of the git directory from the .git file, | |
444 | * return path to git directory if found. | |
445 | */ | |
446 | const char *read_gitfile(const char *path) | |
447 | { | |
448 | char *buf; | |
449 | char *dir; | |
450 | const char *slash; | |
451 | struct stat st; | |
452 | int fd; | |
453 | ssize_t len; | |
454 | ||
455 | if (stat(path, &st)) | |
456 | return NULL; | |
457 | if (!S_ISREG(st.st_mode)) | |
458 | return NULL; | |
459 | fd = open(path, O_RDONLY); | |
460 | if (fd < 0) | |
461 | die_errno("Error opening '%s'", path); | |
462 | buf = xmalloc(st.st_size + 1); | |
463 | len = read_in_full(fd, buf, st.st_size); | |
464 | close(fd); | |
465 | if (len != st.st_size) | |
466 | die("Error reading %s", path); | |
467 | buf[len] = '\0'; | |
468 | if (!starts_with(buf, "gitdir: ")) | |
469 | die("Invalid gitfile format: %s", path); | |
470 | while (buf[len - 1] == '\n' || buf[len - 1] == '\r') | |
471 | len--; | |
472 | if (len < 9) | |
473 | die("No path in gitfile: %s", path); | |
474 | buf[len] = '\0'; | |
475 | dir = buf + 8; | |
476 | ||
477 | if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { | |
478 | size_t pathlen = slash+1 - path; | |
479 | size_t dirlen = pathlen + len - 8; | |
480 | dir = xmalloc(dirlen + 1); | |
481 | strncpy(dir, path, pathlen); | |
482 | strncpy(dir + pathlen, buf + 8, len - 8); | |
483 | dir[dirlen] = '\0'; | |
484 | free(buf); | |
485 | buf = dir; | |
486 | } | |
487 | ||
488 | if (!is_git_directory(dir)) | |
489 | die("Not a git repository: %s", dir); | |
490 | ||
491 | update_linked_gitdir(path, dir); | |
492 | path = real_path(dir); | |
493 | ||
494 | free(buf); | |
495 | return path; | |
496 | } | |
497 | ||
498 | static const char *setup_explicit_git_dir(const char *gitdirenv, | |
499 | struct strbuf *cwd, | |
500 | int *nongit_ok) | |
501 | { | |
502 | const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); | |
503 | const char *worktree; | |
504 | char *gitfile; | |
505 | int offset; | |
506 | ||
507 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
508 | die("'$%s' too big", GIT_DIR_ENVIRONMENT); | |
509 | ||
510 | gitfile = (char*)read_gitfile(gitdirenv); | |
511 | if (gitfile) { | |
512 | gitfile = xstrdup(gitfile); | |
513 | gitdirenv = gitfile; | |
514 | } | |
515 | ||
516 | if (!is_git_directory(gitdirenv)) { | |
517 | if (nongit_ok) { | |
518 | *nongit_ok = 1; | |
519 | free(gitfile); | |
520 | return NULL; | |
521 | } | |
522 | die("Not a git repository: '%s'", gitdirenv); | |
523 | } | |
524 | ||
525 | if (check_repository_format_gently(gitdirenv, nongit_ok)) { | |
526 | free(gitfile); | |
527 | return NULL; | |
528 | } | |
529 | ||
530 | /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ | |
531 | if (work_tree_env) | |
532 | set_git_work_tree(work_tree_env); | |
533 | else if (is_bare_repository_cfg > 0) { | |
534 | if (git_work_tree_cfg) { | |
535 | /* #22.2, #30 */ | |
536 | warning("core.bare and core.worktree do not make sense"); | |
537 | work_tree_config_is_bogus = 1; | |
538 | } | |
539 | ||
540 | /* #18, #26 */ | |
541 | set_git_dir(gitdirenv); | |
542 | free(gitfile); | |
543 | return NULL; | |
544 | } | |
545 | else if (git_work_tree_cfg) { /* #6, #14 */ | |
546 | if (is_absolute_path(git_work_tree_cfg)) | |
547 | set_git_work_tree(git_work_tree_cfg); | |
548 | else { | |
549 | char *core_worktree; | |
550 | if (chdir(gitdirenv)) | |
551 | die_errno("Could not chdir to '%s'", gitdirenv); | |
552 | if (chdir(git_work_tree_cfg)) | |
553 | die_errno("Could not chdir to '%s'", git_work_tree_cfg); | |
554 | core_worktree = xgetcwd(); | |
555 | if (chdir(cwd->buf)) | |
556 | die_errno("Could not come back to cwd"); | |
557 | set_git_work_tree(core_worktree); | |
558 | free(core_worktree); | |
559 | } | |
560 | } | |
561 | else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) { | |
562 | /* #16d */ | |
563 | set_git_dir(gitdirenv); | |
564 | free(gitfile); | |
565 | return NULL; | |
566 | } | |
567 | else /* #2, #10 */ | |
568 | set_git_work_tree("."); | |
569 | ||
570 | /* set_git_work_tree() must have been called by now */ | |
571 | worktree = get_git_work_tree(); | |
572 | ||
573 | /* both get_git_work_tree() and cwd are already normalized */ | |
574 | if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */ | |
575 | set_git_dir(gitdirenv); | |
576 | free(gitfile); | |
577 | return NULL; | |
578 | } | |
579 | ||
580 | offset = dir_inside_of(cwd->buf, worktree); | |
581 | if (offset >= 0) { /* cwd inside worktree? */ | |
582 | set_git_dir(real_path(gitdirenv)); | |
583 | if (chdir(worktree)) | |
584 | die_errno("Could not chdir to '%s'", worktree); | |
585 | strbuf_addch(cwd, '/'); | |
586 | free(gitfile); | |
587 | return cwd->buf + offset; | |
588 | } | |
589 | ||
590 | /* cwd outside worktree */ | |
591 | set_git_dir(gitdirenv); | |
592 | free(gitfile); | |
593 | return NULL; | |
594 | } | |
595 | ||
596 | static const char *setup_discovered_git_dir(const char *gitdir, | |
597 | struct strbuf *cwd, int offset, | |
598 | int *nongit_ok) | |
599 | { | |
600 | if (check_repository_format_gently(gitdir, nongit_ok)) | |
601 | return NULL; | |
602 | ||
603 | /* --work-tree is set without --git-dir; use discovered one */ | |
604 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
605 | if (offset != cwd->len && !is_absolute_path(gitdir)) | |
606 | gitdir = xstrdup(real_path(gitdir)); | |
607 | if (chdir(cwd->buf)) | |
608 | die_errno("Could not come back to cwd"); | |
609 | return setup_explicit_git_dir(gitdir, cwd, nongit_ok); | |
610 | } | |
611 | ||
612 | /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ | |
613 | if (is_bare_repository_cfg > 0) { | |
614 | set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir)); | |
615 | if (chdir(cwd->buf)) | |
616 | die_errno("Could not come back to cwd"); | |
617 | return NULL; | |
618 | } | |
619 | ||
620 | /* #0, #1, #5, #8, #9, #12, #13 */ | |
621 | set_git_work_tree("."); | |
622 | if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) | |
623 | set_git_dir(gitdir); | |
624 | inside_git_dir = 0; | |
625 | inside_work_tree = 1; | |
626 | if (offset == cwd->len) | |
627 | return NULL; | |
628 | ||
629 | /* Make "offset" point to past the '/', and add a '/' at the end */ | |
630 | offset++; | |
631 | strbuf_addch(cwd, '/'); | |
632 | return cwd->buf + offset; | |
633 | } | |
634 | ||
635 | /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ | |
636 | static const char *setup_bare_git_dir(struct strbuf *cwd, int offset, | |
637 | int *nongit_ok) | |
638 | { | |
639 | int root_len; | |
640 | ||
641 | if (check_repository_format_gently(".", nongit_ok)) | |
642 | return NULL; | |
643 | ||
644 | setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); | |
645 | ||
646 | /* --work-tree is set without --git-dir; use discovered one */ | |
647 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
648 | const char *gitdir; | |
649 | ||
650 | gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset); | |
651 | if (chdir(cwd->buf)) | |
652 | die_errno("Could not come back to cwd"); | |
653 | return setup_explicit_git_dir(gitdir, cwd, nongit_ok); | |
654 | } | |
655 | ||
656 | inside_git_dir = 1; | |
657 | inside_work_tree = 0; | |
658 | if (offset != cwd->len) { | |
659 | if (chdir(cwd->buf)) | |
660 | die_errno("Cannot come back to cwd"); | |
661 | root_len = offset_1st_component(cwd->buf); | |
662 | strbuf_setlen(cwd, offset > root_len ? offset : root_len); | |
663 | set_git_dir(cwd->buf); | |
664 | } | |
665 | else | |
666 | set_git_dir("."); | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | static const char *setup_nongit(const char *cwd, int *nongit_ok) | |
671 | { | |
672 | if (!nongit_ok) | |
673 | die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT); | |
674 | if (chdir(cwd)) | |
675 | die_errno("Cannot come back to cwd"); | |
676 | *nongit_ok = 1; | |
677 | return NULL; | |
678 | } | |
679 | ||
680 | static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len) | |
681 | { | |
682 | struct stat buf; | |
683 | if (stat(path, &buf)) { | |
684 | die_errno("failed to stat '%*s%s%s'", | |
685 | prefix_len, | |
686 | prefix ? prefix : "", | |
687 | prefix ? "/" : "", path); | |
688 | } | |
689 | return buf.st_dev; | |
690 | } | |
691 | ||
692 | /* | |
693 | * A "string_list_each_func_t" function that canonicalizes an entry | |
694 | * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or | |
695 | * discards it if unusable. The presence of an empty entry in | |
696 | * GIT_CEILING_DIRECTORIES turns off canonicalization for all | |
697 | * subsequent entries. | |
698 | */ | |
699 | static int canonicalize_ceiling_entry(struct string_list_item *item, | |
700 | void *cb_data) | |
701 | { | |
702 | int *empty_entry_found = cb_data; | |
703 | char *ceil = item->string; | |
704 | ||
705 | if (!*ceil) { | |
706 | *empty_entry_found = 1; | |
707 | return 0; | |
708 | } else if (!is_absolute_path(ceil)) { | |
709 | return 0; | |
710 | } else if (*empty_entry_found) { | |
711 | /* Keep entry but do not canonicalize it */ | |
712 | return 1; | |
713 | } else { | |
714 | const char *real_path = real_path_if_valid(ceil); | |
715 | if (!real_path) | |
716 | return 0; | |
717 | free(item->string); | |
718 | item->string = xstrdup(real_path); | |
719 | return 1; | |
720 | } | |
721 | } | |
722 | ||
723 | /* | |
724 | * We cannot decide in this function whether we are in the work tree or | |
725 | * not, since the config can only be read _after_ this function was called. | |
726 | */ | |
727 | static const char *setup_git_directory_gently_1(int *nongit_ok) | |
728 | { | |
729 | const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); | |
730 | struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; | |
731 | static struct strbuf cwd = STRBUF_INIT; | |
732 | const char *gitdirenv, *ret; | |
733 | char *gitfile; | |
734 | int offset, offset_parent, ceil_offset = -1; | |
735 | dev_t current_device = 0; | |
736 | int one_filesystem = 1; | |
737 | ||
738 | /* | |
739 | * We may have read an incomplete configuration before | |
740 | * setting-up the git directory. If so, clear the cache so | |
741 | * that the next queries to the configuration reload complete | |
742 | * configuration (including the per-repo config file that we | |
743 | * ignored previously). | |
744 | */ | |
745 | git_config_clear(); | |
746 | ||
747 | /* | |
748 | * Let's assume that we are in a git repository. | |
749 | * If it turns out later that we are somewhere else, the value will be | |
750 | * updated accordingly. | |
751 | */ | |
752 | if (nongit_ok) | |
753 | *nongit_ok = 0; | |
754 | ||
755 | if (strbuf_getcwd(&cwd)) | |
756 | die_errno("Unable to read current working directory"); | |
757 | offset = cwd.len; | |
758 | ||
759 | /* | |
760 | * If GIT_DIR is set explicitly, we're not going | |
761 | * to do any discovery, but we still do repository | |
762 | * validation. | |
763 | */ | |
764 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); | |
765 | if (gitdirenv) | |
766 | return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok); | |
767 | ||
768 | if (env_ceiling_dirs) { | |
769 | int empty_entry_found = 0; | |
770 | ||
771 | string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); | |
772 | filter_string_list(&ceiling_dirs, 0, | |
773 | canonicalize_ceiling_entry, &empty_entry_found); | |
774 | ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs); | |
775 | string_list_clear(&ceiling_dirs, 0); | |
776 | } | |
777 | ||
778 | if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf)) | |
779 | ceil_offset = 1; | |
780 | ||
781 | /* | |
782 | * Test in the following order (relative to the cwd): | |
783 | * - .git (file containing "gitdir: <path>") | |
784 | * - .git/ | |
785 | * - ./ (bare) | |
786 | * - ../.git | |
787 | * - ../.git/ | |
788 | * - ../ (bare) | |
789 | * - ../../.git/ | |
790 | * etc. | |
791 | */ | |
792 | one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); | |
793 | if (one_filesystem) | |
794 | current_device = get_device_or_die(".", NULL, 0); | |
795 | for (;;) { | |
796 | gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT); | |
797 | if (gitfile) | |
798 | gitdirenv = gitfile = xstrdup(gitfile); | |
799 | else { | |
800 | if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) | |
801 | gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; | |
802 | } | |
803 | ||
804 | if (gitdirenv) { | |
805 | ret = setup_discovered_git_dir(gitdirenv, | |
806 | &cwd, offset, | |
807 | nongit_ok); | |
808 | free(gitfile); | |
809 | return ret; | |
810 | } | |
811 | free(gitfile); | |
812 | ||
813 | if (is_git_directory(".")) | |
814 | return setup_bare_git_dir(&cwd, offset, nongit_ok); | |
815 | ||
816 | offset_parent = offset; | |
817 | while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/'); | |
818 | if (offset_parent <= ceil_offset) | |
819 | return setup_nongit(cwd.buf, nongit_ok); | |
820 | if (one_filesystem) { | |
821 | dev_t parent_device = get_device_or_die("..", cwd.buf, | |
822 | offset); | |
823 | if (parent_device != current_device) { | |
824 | if (nongit_ok) { | |
825 | if (chdir(cwd.buf)) | |
826 | die_errno("Cannot come back to cwd"); | |
827 | *nongit_ok = 1; | |
828 | return NULL; | |
829 | } | |
830 | strbuf_setlen(&cwd, offset); | |
831 | die("Not a git repository (or any parent up to mount point %s)\n" | |
832 | "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", | |
833 | cwd.buf); | |
834 | } | |
835 | } | |
836 | if (chdir("..")) { | |
837 | strbuf_setlen(&cwd, offset); | |
838 | die_errno("Cannot change to '%s/..'", cwd.buf); | |
839 | } | |
840 | offset = offset_parent; | |
841 | } | |
842 | } | |
843 | ||
844 | const char *setup_git_directory_gently(int *nongit_ok) | |
845 | { | |
846 | const char *prefix; | |
847 | ||
848 | prefix = setup_git_directory_gently_1(nongit_ok); | |
849 | if (prefix) | |
850 | setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); | |
851 | else | |
852 | setenv(GIT_PREFIX_ENVIRONMENT, "", 1); | |
853 | ||
854 | if (startup_info) { | |
855 | startup_info->have_repository = !nongit_ok || !*nongit_ok; | |
856 | startup_info->prefix = prefix; | |
857 | } | |
858 | return prefix; | |
859 | } | |
860 | ||
861 | int git_config_perm(const char *var, const char *value) | |
862 | { | |
863 | int i; | |
864 | char *endptr; | |
865 | ||
866 | if (value == NULL) | |
867 | return PERM_GROUP; | |
868 | ||
869 | if (!strcmp(value, "umask")) | |
870 | return PERM_UMASK; | |
871 | if (!strcmp(value, "group")) | |
872 | return PERM_GROUP; | |
873 | if (!strcmp(value, "all") || | |
874 | !strcmp(value, "world") || | |
875 | !strcmp(value, "everybody")) | |
876 | return PERM_EVERYBODY; | |
877 | ||
878 | /* Parse octal numbers */ | |
879 | i = strtol(value, &endptr, 8); | |
880 | ||
881 | /* If not an octal number, maybe true/false? */ | |
882 | if (*endptr != 0) | |
883 | return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; | |
884 | ||
885 | /* | |
886 | * Treat values 0, 1 and 2 as compatibility cases, otherwise it is | |
887 | * a chmod value to restrict to. | |
888 | */ | |
889 | switch (i) { | |
890 | case PERM_UMASK: /* 0 */ | |
891 | return PERM_UMASK; | |
892 | case OLD_PERM_GROUP: /* 1 */ | |
893 | return PERM_GROUP; | |
894 | case OLD_PERM_EVERYBODY: /* 2 */ | |
895 | return PERM_EVERYBODY; | |
896 | } | |
897 | ||
898 | /* A filemode value was given: 0xxx */ | |
899 | ||
900 | if ((i & 0600) != 0600) | |
901 | die("Problem with core.sharedRepository filemode value " | |
902 | "(0%.3o).\nThe owner of files must always have " | |
903 | "read and write permissions.", i); | |
904 | ||
905 | /* | |
906 | * Mask filemode value. Others can not get write permission. | |
907 | * x flags for directories are handled separately. | |
908 | */ | |
909 | return -(i & 0666); | |
910 | } | |
911 | ||
912 | int check_repository_format_version(const char *var, const char *value, void *cb) | |
913 | { | |
914 | int ret = check_repo_format(var, value, cb); | |
915 | if (ret) | |
916 | return ret; | |
917 | if (strcmp(var, "core.bare") == 0) { | |
918 | is_bare_repository_cfg = git_config_bool(var, value); | |
919 | if (is_bare_repository_cfg == 1) | |
920 | inside_work_tree = -1; | |
921 | } else if (strcmp(var, "core.worktree") == 0) { | |
922 | if (!value) | |
923 | return config_error_nonbool(var); | |
924 | free(git_work_tree_cfg); | |
925 | git_work_tree_cfg = xstrdup(value); | |
926 | inside_work_tree = -1; | |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
931 | int check_repository_format(void) | |
932 | { | |
933 | return check_repository_format_gently(get_git_dir(), NULL); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Returns the "prefix", a path to the current working directory | |
938 | * relative to the work tree root, or NULL, if the current working | |
939 | * directory is not a strict subdirectory of the work tree root. The | |
940 | * prefix always ends with a '/' character. | |
941 | */ | |
942 | const char *setup_git_directory(void) | |
943 | { | |
944 | return setup_git_directory_gently(NULL); | |
945 | } | |
946 | ||
947 | const char *resolve_gitdir(const char *suspect) | |
948 | { | |
949 | if (is_git_directory(suspect)) | |
950 | return suspect; | |
951 | return read_gitfile(suspect); | |
952 | } | |
953 | ||
954 | /* if any standard file descriptor is missing open it to /dev/null */ | |
955 | void sanitize_stdfds(void) | |
956 | { | |
957 | int fd = open("/dev/null", O_RDWR, 0); | |
958 | while (fd != -1 && fd < 2) | |
959 | fd = dup(fd); | |
960 | if (fd == -1) | |
961 | die_errno("open /dev/null or dup failed"); | |
962 | if (fd > 2) | |
963 | close(fd); | |
964 | } | |
965 | ||
966 | int daemonize(void) | |
967 | { | |
968 | #ifdef NO_POSIX_GOODIES | |
969 | errno = ENOSYS; | |
970 | return -1; | |
971 | #else | |
972 | switch (fork()) { | |
973 | case 0: | |
974 | break; | |
975 | case -1: | |
976 | die_errno("fork failed"); | |
977 | default: | |
978 | exit(0); | |
979 | } | |
980 | if (setsid() == -1) | |
981 | die_errno("setsid failed"); | |
982 | close(0); | |
983 | close(1); | |
984 | close(2); | |
985 | sanitize_stdfds(); | |
986 | return 0; | |
987 | #endif | |
988 | } |