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