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1 | #include "cache.h" | |
2 | #include "repository.h" | |
3 | #include "config.h" | |
4 | #include "dir.h" | |
5 | #include "string-list.h" | |
6 | #include "chdir-notify.h" | |
7 | #include "promisor-remote.h" | |
8 | ||
9 | static int inside_git_dir = -1; | |
10 | static int inside_work_tree = -1; | |
11 | static int work_tree_config_is_bogus; | |
12 | ||
13 | static struct startup_info the_startup_info; | |
14 | struct startup_info *startup_info = &the_startup_info; | |
15 | ||
16 | /* | |
17 | * The input parameter must contain an absolute path, and it must already be | |
18 | * normalized. | |
19 | * | |
20 | * Find the part of an absolute path that lies inside the work tree by | |
21 | * dereferencing symlinks outside the work tree, for example: | |
22 | * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file | |
23 | * /dir/file (work tree is /) -> dir/file | |
24 | * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2 | |
25 | * /dir/repolink/file (repolink points to /dir/repo) -> file | |
26 | * /dir/repo (exactly equal to work tree) -> (empty string) | |
27 | */ | |
28 | static int abspath_part_inside_repo(char *path) | |
29 | { | |
30 | size_t len; | |
31 | size_t wtlen; | |
32 | char *path0; | |
33 | int off; | |
34 | const char *work_tree = get_git_work_tree(); | |
35 | ||
36 | if (!work_tree) | |
37 | return -1; | |
38 | wtlen = strlen(work_tree); | |
39 | len = strlen(path); | |
40 | off = offset_1st_component(path); | |
41 | ||
42 | /* check if work tree is already the prefix */ | |
43 | if (wtlen <= len && !fspathncmp(path, work_tree, wtlen)) { | |
44 | if (path[wtlen] == '/') { | |
45 | memmove(path, path + wtlen + 1, len - wtlen); | |
46 | return 0; | |
47 | } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') { | |
48 | /* work tree is the root, or the whole path */ | |
49 | memmove(path, path + wtlen, len - wtlen + 1); | |
50 | return 0; | |
51 | } | |
52 | /* work tree might match beginning of a symlink to work tree */ | |
53 | off = wtlen; | |
54 | } | |
55 | path0 = path; | |
56 | path += off; | |
57 | ||
58 | /* check each '/'-terminated level */ | |
59 | while (*path) { | |
60 | path++; | |
61 | if (*path == '/') { | |
62 | *path = '\0'; | |
63 | if (fspathcmp(real_path(path0), work_tree) == 0) { | |
64 | memmove(path0, path + 1, len - (path - path0)); | |
65 | return 0; | |
66 | } | |
67 | *path = '/'; | |
68 | } | |
69 | } | |
70 | ||
71 | /* check whole path */ | |
72 | if (fspathcmp(real_path(path0), work_tree) == 0) { | |
73 | *path0 = '\0'; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | return -1; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Normalize "path", prepending the "prefix" for relative paths. If | |
82 | * remaining_prefix is not NULL, return the actual prefix still | |
83 | * remains in the path. For example, prefix = sub1/sub2/ and path is | |
84 | * | |
85 | * foo -> sub1/sub2/foo (full prefix) | |
86 | * ../foo -> sub1/foo (remaining prefix is sub1/) | |
87 | * ../../bar -> bar (no remaining prefix) | |
88 | * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) | |
89 | * `pwd`/../bar -> sub1/bar (no remaining prefix) | |
90 | */ | |
91 | char *prefix_path_gently(const char *prefix, int len, | |
92 | int *remaining_prefix, const char *path) | |
93 | { | |
94 | const char *orig = path; | |
95 | char *sanitized; | |
96 | if (is_absolute_path(orig)) { | |
97 | sanitized = xmallocz(strlen(path)); | |
98 | if (remaining_prefix) | |
99 | *remaining_prefix = 0; | |
100 | if (normalize_path_copy_len(sanitized, path, remaining_prefix)) { | |
101 | free(sanitized); | |
102 | return NULL; | |
103 | } | |
104 | if (abspath_part_inside_repo(sanitized)) { | |
105 | free(sanitized); | |
106 | return NULL; | |
107 | } | |
108 | } else { | |
109 | sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path); | |
110 | if (remaining_prefix) | |
111 | *remaining_prefix = len; | |
112 | if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { | |
113 | free(sanitized); | |
114 | return NULL; | |
115 | } | |
116 | } | |
117 | return sanitized; | |
118 | } | |
119 | ||
120 | char *prefix_path(const char *prefix, int len, const char *path) | |
121 | { | |
122 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
123 | if (!r) { | |
124 | const char *hint_path = get_git_work_tree(); | |
125 | if (!hint_path) | |
126 | hint_path = get_git_dir(); | |
127 | die(_("'%s' is outside repository at '%s'"), path, | |
128 | absolute_path(hint_path)); | |
129 | } | |
130 | return r; | |
131 | } | |
132 | ||
133 | int path_inside_repo(const char *prefix, const char *path) | |
134 | { | |
135 | int len = prefix ? strlen(prefix) : 0; | |
136 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
137 | if (r) { | |
138 | free(r); | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | int check_filename(const char *prefix, const char *arg) | |
145 | { | |
146 | char *to_free = NULL; | |
147 | struct stat st; | |
148 | ||
149 | if (skip_prefix(arg, ":/", &arg)) { | |
150 | if (!*arg) /* ":/" is root dir, always exists */ | |
151 | return 1; | |
152 | prefix = NULL; | |
153 | } else if (skip_prefix(arg, ":!", &arg) || | |
154 | skip_prefix(arg, ":^", &arg)) { | |
155 | if (!*arg) /* excluding everything is silly, but allowed */ | |
156 | return 1; | |
157 | } | |
158 | ||
159 | if (prefix) | |
160 | arg = to_free = prefix_filename(prefix, arg); | |
161 | ||
162 | if (!lstat(arg, &st)) { | |
163 | free(to_free); | |
164 | return 1; /* file exists */ | |
165 | } | |
166 | if (is_missing_file_error(errno)) { | |
167 | free(to_free); | |
168 | return 0; /* file does not exist */ | |
169 | } | |
170 | die_errno(_("failed to stat '%s'"), arg); | |
171 | } | |
172 | ||
173 | static void NORETURN die_verify_filename(struct repository *r, | |
174 | const char *prefix, | |
175 | const char *arg, | |
176 | int diagnose_misspelt_rev) | |
177 | { | |
178 | if (!diagnose_misspelt_rev) | |
179 | die(_("%s: no such path in the working tree.\n" | |
180 | "Use 'git <command> -- <path>...' to specify paths that do not exist locally."), | |
181 | arg); | |
182 | /* | |
183 | * Saying "'(icase)foo' does not exist in the index" when the | |
184 | * user gave us ":(icase)foo" is just stupid. A magic pathspec | |
185 | * begins with a colon and is followed by a non-alnum; do not | |
186 | * let maybe_die_on_misspelt_object_name() even trigger. | |
187 | */ | |
188 | if (!(arg[0] == ':' && !isalnum(arg[1]))) | |
189 | maybe_die_on_misspelt_object_name(r, arg, prefix); | |
190 | ||
191 | /* ... or fall back the most general message. */ | |
192 | die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n" | |
193 | "Use '--' to separate paths from revisions, like this:\n" | |
194 | "'git <command> [<revision>...] -- [<file>...]'"), arg); | |
195 | ||
196 | } | |
197 | ||
198 | /* | |
199 | * Check for arguments that don't resolve as actual files, | |
200 | * but which look sufficiently like pathspecs that we'll consider | |
201 | * them such for the purposes of rev/pathspec DWIM parsing. | |
202 | */ | |
203 | static int looks_like_pathspec(const char *arg) | |
204 | { | |
205 | const char *p; | |
206 | int escaped = 0; | |
207 | ||
208 | /* | |
209 | * Wildcard characters imply the user is looking to match pathspecs | |
210 | * that aren't in the filesystem. Note that this doesn't include | |
211 | * backslash even though it's a glob special; by itself it doesn't | |
212 | * cause any increase in the match. Likewise ignore backslash-escaped | |
213 | * wildcard characters. | |
214 | */ | |
215 | for (p = arg; *p; p++) { | |
216 | if (escaped) { | |
217 | escaped = 0; | |
218 | } else if (is_glob_special(*p)) { | |
219 | if (*p == '\\') | |
220 | escaped = 1; | |
221 | else | |
222 | return 1; | |
223 | } | |
224 | } | |
225 | ||
226 | /* long-form pathspec magic */ | |
227 | if (starts_with(arg, ":(")) | |
228 | return 1; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Verify a filename that we got as an argument for a pathspec | |
235 | * entry. Note that a filename that begins with "-" never verifies | |
236 | * as true, because even if such a filename were to exist, we want | |
237 | * it to be preceded by the "--" marker (or we want the user to | |
238 | * use a format like "./-filename") | |
239 | * | |
240 | * The "diagnose_misspelt_rev" is used to provide a user-friendly | |
241 | * diagnosis when dying upon finding that "name" is not a pathname. | |
242 | * If set to 1, the diagnosis will try to diagnose "name" as an | |
243 | * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis | |
244 | * will only complain about an inexisting file. | |
245 | * | |
246 | * This function is typically called to check that a "file or rev" | |
247 | * argument is unambiguous. In this case, the caller will want | |
248 | * diagnose_misspelt_rev == 1 when verifying the first non-rev | |
249 | * argument (which could have been a revision), and | |
250 | * diagnose_misspelt_rev == 0 for the next ones (because we already | |
251 | * saw a filename, there's not ambiguity anymore). | |
252 | */ | |
253 | void verify_filename(const char *prefix, | |
254 | const char *arg, | |
255 | int diagnose_misspelt_rev) | |
256 | { | |
257 | if (*arg == '-') | |
258 | die(_("option '%s' must come before non-option arguments"), arg); | |
259 | if (looks_like_pathspec(arg) || check_filename(prefix, arg)) | |
260 | return; | |
261 | die_verify_filename(the_repository, prefix, arg, diagnose_misspelt_rev); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Opposite of the above: the command line did not have -- marker | |
266 | * and we parsed the arg as a refname. It should not be interpretable | |
267 | * as a filename. | |
268 | */ | |
269 | void verify_non_filename(const char *prefix, const char *arg) | |
270 | { | |
271 | if (!is_inside_work_tree() || is_inside_git_dir()) | |
272 | return; | |
273 | if (*arg == '-') | |
274 | return; /* flag */ | |
275 | if (!check_filename(prefix, arg)) | |
276 | return; | |
277 | die(_("ambiguous argument '%s': both revision and filename\n" | |
278 | "Use '--' to separate paths from revisions, like this:\n" | |
279 | "'git <command> [<revision>...] -- [<file>...]'"), arg); | |
280 | } | |
281 | ||
282 | int get_common_dir(struct strbuf *sb, const char *gitdir) | |
283 | { | |
284 | const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT); | |
285 | if (git_env_common_dir) { | |
286 | strbuf_addstr(sb, git_env_common_dir); | |
287 | return 1; | |
288 | } else { | |
289 | return get_common_dir_noenv(sb, gitdir); | |
290 | } | |
291 | } | |
292 | ||
293 | int get_common_dir_noenv(struct strbuf *sb, const char *gitdir) | |
294 | { | |
295 | struct strbuf data = STRBUF_INIT; | |
296 | struct strbuf path = STRBUF_INIT; | |
297 | int ret = 0; | |
298 | ||
299 | strbuf_addf(&path, "%s/commondir", gitdir); | |
300 | if (file_exists(path.buf)) { | |
301 | if (strbuf_read_file(&data, path.buf, 0) <= 0) | |
302 | die_errno(_("failed to read %s"), path.buf); | |
303 | while (data.len && (data.buf[data.len - 1] == '\n' || | |
304 | data.buf[data.len - 1] == '\r')) | |
305 | data.len--; | |
306 | data.buf[data.len] = '\0'; | |
307 | strbuf_reset(&path); | |
308 | if (!is_absolute_path(data.buf)) | |
309 | strbuf_addf(&path, "%s/", gitdir); | |
310 | strbuf_addbuf(&path, &data); | |
311 | strbuf_add_real_path(sb, path.buf); | |
312 | ret = 1; | |
313 | } else { | |
314 | strbuf_addstr(sb, gitdir); | |
315 | } | |
316 | ||
317 | strbuf_release(&data); | |
318 | strbuf_release(&path); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Test if it looks like we're at a git directory. | |
324 | * We want to see: | |
325 | * | |
326 | * - either an objects/ directory _or_ the proper | |
327 | * GIT_OBJECT_DIRECTORY environment variable | |
328 | * - a refs/ directory | |
329 | * - either a HEAD symlink or a HEAD file that is formatted as | |
330 | * a proper "ref:", or a regular file HEAD that has a properly | |
331 | * formatted sha1 object name. | |
332 | */ | |
333 | int is_git_directory(const char *suspect) | |
334 | { | |
335 | struct strbuf path = STRBUF_INIT; | |
336 | int ret = 0; | |
337 | size_t len; | |
338 | ||
339 | /* Check worktree-related signatures */ | |
340 | strbuf_addstr(&path, suspect); | |
341 | strbuf_complete(&path, '/'); | |
342 | strbuf_addstr(&path, "HEAD"); | |
343 | if (validate_headref(path.buf)) | |
344 | goto done; | |
345 | ||
346 | strbuf_reset(&path); | |
347 | get_common_dir(&path, suspect); | |
348 | len = path.len; | |
349 | ||
350 | /* Check non-worktree-related signatures */ | |
351 | if (getenv(DB_ENVIRONMENT)) { | |
352 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
353 | goto done; | |
354 | } | |
355 | else { | |
356 | strbuf_setlen(&path, len); | |
357 | strbuf_addstr(&path, "/objects"); | |
358 | if (access(path.buf, X_OK)) | |
359 | goto done; | |
360 | } | |
361 | ||
362 | strbuf_setlen(&path, len); | |
363 | strbuf_addstr(&path, "/refs"); | |
364 | if (access(path.buf, X_OK)) | |
365 | goto done; | |
366 | ||
367 | ret = 1; | |
368 | done: | |
369 | strbuf_release(&path); | |
370 | return ret; | |
371 | } | |
372 | ||
373 | int is_nonbare_repository_dir(struct strbuf *path) | |
374 | { | |
375 | int ret = 0; | |
376 | int gitfile_error; | |
377 | size_t orig_path_len = path->len; | |
378 | assert(orig_path_len != 0); | |
379 | strbuf_complete(path, '/'); | |
380 | strbuf_addstr(path, ".git"); | |
381 | if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf)) | |
382 | ret = 1; | |
383 | if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED || | |
384 | gitfile_error == READ_GITFILE_ERR_READ_FAILED) | |
385 | ret = 1; | |
386 | strbuf_setlen(path, orig_path_len); | |
387 | return ret; | |
388 | } | |
389 | ||
390 | int is_inside_git_dir(void) | |
391 | { | |
392 | if (inside_git_dir < 0) | |
393 | inside_git_dir = is_inside_dir(get_git_dir()); | |
394 | return inside_git_dir; | |
395 | } | |
396 | ||
397 | int is_inside_work_tree(void) | |
398 | { | |
399 | if (inside_work_tree < 0) | |
400 | inside_work_tree = is_inside_dir(get_git_work_tree()); | |
401 | return inside_work_tree; | |
402 | } | |
403 | ||
404 | void setup_work_tree(void) | |
405 | { | |
406 | const char *work_tree; | |
407 | static int initialized = 0; | |
408 | ||
409 | if (initialized) | |
410 | return; | |
411 | ||
412 | if (work_tree_config_is_bogus) | |
413 | die(_("unable to set up work tree using invalid config")); | |
414 | ||
415 | work_tree = get_git_work_tree(); | |
416 | if (!work_tree || chdir_notify(work_tree)) | |
417 | die(_("this operation must be run in a work tree")); | |
418 | ||
419 | /* | |
420 | * Make sure subsequent git processes find correct worktree | |
421 | * if $GIT_WORK_TREE is set relative | |
422 | */ | |
423 | if (getenv(GIT_WORK_TREE_ENVIRONMENT)) | |
424 | setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); | |
425 | ||
426 | initialized = 1; | |
427 | } | |
428 | ||
429 | static int read_worktree_config(const char *var, const char *value, void *vdata) | |
430 | { | |
431 | struct repository_format *data = vdata; | |
432 | ||
433 | if (strcmp(var, "core.bare") == 0) { | |
434 | data->is_bare = git_config_bool(var, value); | |
435 | } else if (strcmp(var, "core.worktree") == 0) { | |
436 | if (!value) | |
437 | return config_error_nonbool(var); | |
438 | free(data->work_tree); | |
439 | data->work_tree = xstrdup(value); | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static int check_repo_format(const char *var, const char *value, void *vdata) | |
445 | { | |
446 | struct repository_format *data = vdata; | |
447 | const char *ext; | |
448 | ||
449 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
450 | data->version = git_config_int(var, value); | |
451 | else if (skip_prefix(var, "extensions.", &ext)) { | |
452 | /* | |
453 | * record any known extensions here; otherwise, | |
454 | * we fall through to recording it as unknown, and | |
455 | * check_repository_format will complain | |
456 | */ | |
457 | if (!strcmp(ext, "noop")) | |
458 | ; | |
459 | else if (!strcmp(ext, "preciousobjects")) | |
460 | data->precious_objects = git_config_bool(var, value); | |
461 | else if (!strcmp(ext, "partialclone")) { | |
462 | if (!value) | |
463 | return config_error_nonbool(var); | |
464 | data->partial_clone = xstrdup(value); | |
465 | } else if (!strcmp(ext, "worktreeconfig")) | |
466 | data->worktree_config = git_config_bool(var, value); | |
467 | else | |
468 | string_list_append(&data->unknown_extensions, ext); | |
469 | } | |
470 | ||
471 | return read_worktree_config(var, value, vdata); | |
472 | } | |
473 | ||
474 | static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok) | |
475 | { | |
476 | struct strbuf sb = STRBUF_INIT; | |
477 | struct strbuf err = STRBUF_INIT; | |
478 | int has_common; | |
479 | ||
480 | has_common = get_common_dir(&sb, gitdir); | |
481 | strbuf_addstr(&sb, "/config"); | |
482 | read_repository_format(candidate, sb.buf); | |
483 | strbuf_release(&sb); | |
484 | ||
485 | /* | |
486 | * For historical use of check_repository_format() in git-init, | |
487 | * we treat a missing config as a silent "ok", even when nongit_ok | |
488 | * is unset. | |
489 | */ | |
490 | if (candidate->version < 0) | |
491 | return 0; | |
492 | ||
493 | if (verify_repository_format(candidate, &err) < 0) { | |
494 | if (nongit_ok) { | |
495 | warning("%s", err.buf); | |
496 | strbuf_release(&err); | |
497 | *nongit_ok = -1; | |
498 | return -1; | |
499 | } | |
500 | die("%s", err.buf); | |
501 | } | |
502 | ||
503 | repository_format_precious_objects = candidate->precious_objects; | |
504 | set_repository_format_partial_clone(candidate->partial_clone); | |
505 | repository_format_worktree_config = candidate->worktree_config; | |
506 | string_list_clear(&candidate->unknown_extensions, 0); | |
507 | ||
508 | if (repository_format_worktree_config) { | |
509 | /* | |
510 | * pick up core.bare and core.worktree from per-worktree | |
511 | * config if present | |
512 | */ | |
513 | strbuf_addf(&sb, "%s/config.worktree", gitdir); | |
514 | git_config_from_file(read_worktree_config, sb.buf, candidate); | |
515 | strbuf_release(&sb); | |
516 | has_common = 0; | |
517 | } | |
518 | ||
519 | if (!has_common) { | |
520 | if (candidate->is_bare != -1) { | |
521 | is_bare_repository_cfg = candidate->is_bare; | |
522 | if (is_bare_repository_cfg == 1) | |
523 | inside_work_tree = -1; | |
524 | } | |
525 | if (candidate->work_tree) { | |
526 | free(git_work_tree_cfg); | |
527 | git_work_tree_cfg = xstrdup(candidate->work_tree); | |
528 | inside_work_tree = -1; | |
529 | } | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | static void init_repository_format(struct repository_format *format) | |
536 | { | |
537 | const struct repository_format fresh = REPOSITORY_FORMAT_INIT; | |
538 | ||
539 | memcpy(format, &fresh, sizeof(fresh)); | |
540 | } | |
541 | ||
542 | int read_repository_format(struct repository_format *format, const char *path) | |
543 | { | |
544 | clear_repository_format(format); | |
545 | git_config_from_file(check_repo_format, path, format); | |
546 | if (format->version == -1) | |
547 | clear_repository_format(format); | |
548 | return format->version; | |
549 | } | |
550 | ||
551 | void clear_repository_format(struct repository_format *format) | |
552 | { | |
553 | string_list_clear(&format->unknown_extensions, 0); | |
554 | free(format->work_tree); | |
555 | free(format->partial_clone); | |
556 | init_repository_format(format); | |
557 | } | |
558 | ||
559 | int verify_repository_format(const struct repository_format *format, | |
560 | struct strbuf *err) | |
561 | { | |
562 | if (GIT_REPO_VERSION_READ < format->version) { | |
563 | strbuf_addf(err, _("Expected git repo version <= %d, found %d"), | |
564 | GIT_REPO_VERSION_READ, format->version); | |
565 | return -1; | |
566 | } | |
567 | ||
568 | if (format->version >= 1 && format->unknown_extensions.nr) { | |
569 | int i; | |
570 | ||
571 | strbuf_addstr(err, _("unknown repository extensions found:")); | |
572 | ||
573 | for (i = 0; i < format->unknown_extensions.nr; i++) | |
574 | strbuf_addf(err, "\n\t%s", | |
575 | format->unknown_extensions.items[i].string); | |
576 | return -1; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | void read_gitfile_error_die(int error_code, const char *path, const char *dir) | |
583 | { | |
584 | switch (error_code) { | |
585 | case READ_GITFILE_ERR_STAT_FAILED: | |
586 | case READ_GITFILE_ERR_NOT_A_FILE: | |
587 | /* non-fatal; follow return path */ | |
588 | break; | |
589 | case READ_GITFILE_ERR_OPEN_FAILED: | |
590 | die_errno(_("error opening '%s'"), path); | |
591 | case READ_GITFILE_ERR_TOO_LARGE: | |
592 | die(_("too large to be a .git file: '%s'"), path); | |
593 | case READ_GITFILE_ERR_READ_FAILED: | |
594 | die(_("error reading %s"), path); | |
595 | case READ_GITFILE_ERR_INVALID_FORMAT: | |
596 | die(_("invalid gitfile format: %s"), path); | |
597 | case READ_GITFILE_ERR_NO_PATH: | |
598 | die(_("no path in gitfile: %s"), path); | |
599 | case READ_GITFILE_ERR_NOT_A_REPO: | |
600 | die(_("not a git repository: %s"), dir); | |
601 | default: | |
602 | BUG("unknown error code"); | |
603 | } | |
604 | } | |
605 | ||
606 | /* | |
607 | * Try to read the location of the git directory from the .git file, | |
608 | * return path to git directory if found. The return value comes from | |
609 | * a shared buffer. | |
610 | * | |
611 | * On failure, if return_error_code is not NULL, return_error_code | |
612 | * will be set to an error code and NULL will be returned. If | |
613 | * return_error_code is NULL the function will die instead (for most | |
614 | * cases). | |
615 | */ | |
616 | const char *read_gitfile_gently(const char *path, int *return_error_code) | |
617 | { | |
618 | const int max_file_size = 1 << 20; /* 1MB */ | |
619 | int error_code = 0; | |
620 | char *buf = NULL; | |
621 | char *dir = NULL; | |
622 | const char *slash; | |
623 | struct stat st; | |
624 | int fd; | |
625 | ssize_t len; | |
626 | ||
627 | if (stat(path, &st)) { | |
628 | /* NEEDSWORK: discern between ENOENT vs other errors */ | |
629 | error_code = READ_GITFILE_ERR_STAT_FAILED; | |
630 | goto cleanup_return; | |
631 | } | |
632 | if (!S_ISREG(st.st_mode)) { | |
633 | error_code = READ_GITFILE_ERR_NOT_A_FILE; | |
634 | goto cleanup_return; | |
635 | } | |
636 | if (st.st_size > max_file_size) { | |
637 | error_code = READ_GITFILE_ERR_TOO_LARGE; | |
638 | goto cleanup_return; | |
639 | } | |
640 | fd = open(path, O_RDONLY); | |
641 | if (fd < 0) { | |
642 | error_code = READ_GITFILE_ERR_OPEN_FAILED; | |
643 | goto cleanup_return; | |
644 | } | |
645 | buf = xmallocz(st.st_size); | |
646 | len = read_in_full(fd, buf, st.st_size); | |
647 | close(fd); | |
648 | if (len != st.st_size) { | |
649 | error_code = READ_GITFILE_ERR_READ_FAILED; | |
650 | goto cleanup_return; | |
651 | } | |
652 | if (!starts_with(buf, "gitdir: ")) { | |
653 | error_code = READ_GITFILE_ERR_INVALID_FORMAT; | |
654 | goto cleanup_return; | |
655 | } | |
656 | while (buf[len - 1] == '\n' || buf[len - 1] == '\r') | |
657 | len--; | |
658 | if (len < 9) { | |
659 | error_code = READ_GITFILE_ERR_NO_PATH; | |
660 | goto cleanup_return; | |
661 | } | |
662 | buf[len] = '\0'; | |
663 | dir = buf + 8; | |
664 | ||
665 | if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { | |
666 | size_t pathlen = slash+1 - path; | |
667 | dir = xstrfmt("%.*s%.*s", (int)pathlen, path, | |
668 | (int)(len - 8), buf + 8); | |
669 | free(buf); | |
670 | buf = dir; | |
671 | } | |
672 | if (!is_git_directory(dir)) { | |
673 | error_code = READ_GITFILE_ERR_NOT_A_REPO; | |
674 | goto cleanup_return; | |
675 | } | |
676 | path = real_path(dir); | |
677 | ||
678 | cleanup_return: | |
679 | if (return_error_code) | |
680 | *return_error_code = error_code; | |
681 | else if (error_code) | |
682 | read_gitfile_error_die(error_code, path, dir); | |
683 | ||
684 | free(buf); | |
685 | return error_code ? NULL : path; | |
686 | } | |
687 | ||
688 | static const char *setup_explicit_git_dir(const char *gitdirenv, | |
689 | struct strbuf *cwd, | |
690 | struct repository_format *repo_fmt, | |
691 | int *nongit_ok) | |
692 | { | |
693 | const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); | |
694 | const char *worktree; | |
695 | char *gitfile; | |
696 | int offset; | |
697 | ||
698 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
699 | die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT); | |
700 | ||
701 | gitfile = (char*)read_gitfile(gitdirenv); | |
702 | if (gitfile) { | |
703 | gitfile = xstrdup(gitfile); | |
704 | gitdirenv = gitfile; | |
705 | } | |
706 | ||
707 | if (!is_git_directory(gitdirenv)) { | |
708 | if (nongit_ok) { | |
709 | *nongit_ok = 1; | |
710 | free(gitfile); | |
711 | return NULL; | |
712 | } | |
713 | die(_("not a git repository: '%s'"), gitdirenv); | |
714 | } | |
715 | ||
716 | if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) { | |
717 | free(gitfile); | |
718 | return NULL; | |
719 | } | |
720 | ||
721 | /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ | |
722 | if (work_tree_env) | |
723 | set_git_work_tree(work_tree_env); | |
724 | else if (is_bare_repository_cfg > 0) { | |
725 | if (git_work_tree_cfg) { | |
726 | /* #22.2, #30 */ | |
727 | warning("core.bare and core.worktree do not make sense"); | |
728 | work_tree_config_is_bogus = 1; | |
729 | } | |
730 | ||
731 | /* #18, #26 */ | |
732 | set_git_dir(gitdirenv); | |
733 | free(gitfile); | |
734 | return NULL; | |
735 | } | |
736 | else if (git_work_tree_cfg) { /* #6, #14 */ | |
737 | if (is_absolute_path(git_work_tree_cfg)) | |
738 | set_git_work_tree(git_work_tree_cfg); | |
739 | else { | |
740 | char *core_worktree; | |
741 | if (chdir(gitdirenv)) | |
742 | die_errno(_("cannot chdir to '%s'"), gitdirenv); | |
743 | if (chdir(git_work_tree_cfg)) | |
744 | die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg); | |
745 | core_worktree = xgetcwd(); | |
746 | if (chdir(cwd->buf)) | |
747 | die_errno(_("cannot come back to cwd")); | |
748 | set_git_work_tree(core_worktree); | |
749 | free(core_worktree); | |
750 | } | |
751 | } | |
752 | else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) { | |
753 | /* #16d */ | |
754 | set_git_dir(gitdirenv); | |
755 | free(gitfile); | |
756 | return NULL; | |
757 | } | |
758 | else /* #2, #10 */ | |
759 | set_git_work_tree("."); | |
760 | ||
761 | /* set_git_work_tree() must have been called by now */ | |
762 | worktree = get_git_work_tree(); | |
763 | ||
764 | /* both get_git_work_tree() and cwd are already normalized */ | |
765 | if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */ | |
766 | set_git_dir(gitdirenv); | |
767 | free(gitfile); | |
768 | return NULL; | |
769 | } | |
770 | ||
771 | offset = dir_inside_of(cwd->buf, worktree); | |
772 | if (offset >= 0) { /* cwd inside worktree? */ | |
773 | set_git_dir(real_path(gitdirenv)); | |
774 | if (chdir(worktree)) | |
775 | die_errno(_("cannot chdir to '%s'"), worktree); | |
776 | strbuf_addch(cwd, '/'); | |
777 | free(gitfile); | |
778 | return cwd->buf + offset; | |
779 | } | |
780 | ||
781 | /* cwd outside worktree */ | |
782 | set_git_dir(gitdirenv); | |
783 | free(gitfile); | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | static const char *setup_discovered_git_dir(const char *gitdir, | |
788 | struct strbuf *cwd, int offset, | |
789 | struct repository_format *repo_fmt, | |
790 | int *nongit_ok) | |
791 | { | |
792 | if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok)) | |
793 | return NULL; | |
794 | ||
795 | /* --work-tree is set without --git-dir; use discovered one */ | |
796 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
797 | char *to_free = NULL; | |
798 | const char *ret; | |
799 | ||
800 | if (offset != cwd->len && !is_absolute_path(gitdir)) | |
801 | gitdir = to_free = real_pathdup(gitdir, 1); | |
802 | if (chdir(cwd->buf)) | |
803 | die_errno(_("cannot come back to cwd")); | |
804 | ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); | |
805 | free(to_free); | |
806 | return ret; | |
807 | } | |
808 | ||
809 | /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ | |
810 | if (is_bare_repository_cfg > 0) { | |
811 | set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir)); | |
812 | if (chdir(cwd->buf)) | |
813 | die_errno(_("cannot come back to cwd")); | |
814 | return NULL; | |
815 | } | |
816 | ||
817 | /* #0, #1, #5, #8, #9, #12, #13 */ | |
818 | set_git_work_tree("."); | |
819 | if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) | |
820 | set_git_dir(gitdir); | |
821 | inside_git_dir = 0; | |
822 | inside_work_tree = 1; | |
823 | if (offset >= cwd->len) | |
824 | return NULL; | |
825 | ||
826 | /* Make "offset" point past the '/' (already the case for root dirs) */ | |
827 | if (offset != offset_1st_component(cwd->buf)) | |
828 | offset++; | |
829 | /* Add a '/' at the end */ | |
830 | strbuf_addch(cwd, '/'); | |
831 | return cwd->buf + offset; | |
832 | } | |
833 | ||
834 | /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ | |
835 | static const char *setup_bare_git_dir(struct strbuf *cwd, int offset, | |
836 | struct repository_format *repo_fmt, | |
837 | int *nongit_ok) | |
838 | { | |
839 | int root_len; | |
840 | ||
841 | if (check_repository_format_gently(".", repo_fmt, nongit_ok)) | |
842 | return NULL; | |
843 | ||
844 | setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); | |
845 | ||
846 | /* --work-tree is set without --git-dir; use discovered one */ | |
847 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
848 | static const char *gitdir; | |
849 | ||
850 | gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset); | |
851 | if (chdir(cwd->buf)) | |
852 | die_errno(_("cannot come back to cwd")); | |
853 | return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); | |
854 | } | |
855 | ||
856 | inside_git_dir = 1; | |
857 | inside_work_tree = 0; | |
858 | if (offset != cwd->len) { | |
859 | if (chdir(cwd->buf)) | |
860 | die_errno(_("cannot come back to cwd")); | |
861 | root_len = offset_1st_component(cwd->buf); | |
862 | strbuf_setlen(cwd, offset > root_len ? offset : root_len); | |
863 | set_git_dir(cwd->buf); | |
864 | } | |
865 | else | |
866 | set_git_dir("."); | |
867 | return NULL; | |
868 | } | |
869 | ||
870 | static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len) | |
871 | { | |
872 | struct stat buf; | |
873 | if (stat(path, &buf)) { | |
874 | die_errno(_("failed to stat '%*s%s%s'"), | |
875 | prefix_len, | |
876 | prefix ? prefix : "", | |
877 | prefix ? "/" : "", path); | |
878 | } | |
879 | return buf.st_dev; | |
880 | } | |
881 | ||
882 | /* | |
883 | * A "string_list_each_func_t" function that canonicalizes an entry | |
884 | * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or | |
885 | * discards it if unusable. The presence of an empty entry in | |
886 | * GIT_CEILING_DIRECTORIES turns off canonicalization for all | |
887 | * subsequent entries. | |
888 | */ | |
889 | static int canonicalize_ceiling_entry(struct string_list_item *item, | |
890 | void *cb_data) | |
891 | { | |
892 | int *empty_entry_found = cb_data; | |
893 | char *ceil = item->string; | |
894 | ||
895 | if (!*ceil) { | |
896 | *empty_entry_found = 1; | |
897 | return 0; | |
898 | } else if (!is_absolute_path(ceil)) { | |
899 | return 0; | |
900 | } else if (*empty_entry_found) { | |
901 | /* Keep entry but do not canonicalize it */ | |
902 | return 1; | |
903 | } else { | |
904 | char *real_path = real_pathdup(ceil, 0); | |
905 | if (!real_path) { | |
906 | return 0; | |
907 | } | |
908 | free(item->string); | |
909 | item->string = real_path; | |
910 | return 1; | |
911 | } | |
912 | } | |
913 | ||
914 | enum discovery_result { | |
915 | GIT_DIR_NONE = 0, | |
916 | GIT_DIR_EXPLICIT, | |
917 | GIT_DIR_DISCOVERED, | |
918 | GIT_DIR_BARE, | |
919 | /* these are errors */ | |
920 | GIT_DIR_HIT_CEILING = -1, | |
921 | GIT_DIR_HIT_MOUNT_POINT = -2, | |
922 | GIT_DIR_INVALID_GITFILE = -3 | |
923 | }; | |
924 | ||
925 | /* | |
926 | * We cannot decide in this function whether we are in the work tree or | |
927 | * not, since the config can only be read _after_ this function was called. | |
928 | * | |
929 | * Also, we avoid changing any global state (such as the current working | |
930 | * directory) to allow early callers. | |
931 | * | |
932 | * The directory where the search should start needs to be passed in via the | |
933 | * `dir` parameter; upon return, the `dir` buffer will contain the path of | |
934 | * the directory where the search ended, and `gitdir` will contain the path of | |
935 | * the discovered .git/ directory, if any. If `gitdir` is not absolute, it | |
936 | * is relative to `dir` (i.e. *not* necessarily the cwd). | |
937 | */ | |
938 | static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, | |
939 | struct strbuf *gitdir, | |
940 | int die_on_error) | |
941 | { | |
942 | const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); | |
943 | struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; | |
944 | const char *gitdirenv; | |
945 | int ceil_offset = -1, min_offset = offset_1st_component(dir->buf); | |
946 | dev_t current_device = 0; | |
947 | int one_filesystem = 1; | |
948 | ||
949 | /* | |
950 | * If GIT_DIR is set explicitly, we're not going | |
951 | * to do any discovery, but we still do repository | |
952 | * validation. | |
953 | */ | |
954 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); | |
955 | if (gitdirenv) { | |
956 | strbuf_addstr(gitdir, gitdirenv); | |
957 | return GIT_DIR_EXPLICIT; | |
958 | } | |
959 | ||
960 | if (env_ceiling_dirs) { | |
961 | int empty_entry_found = 0; | |
962 | ||
963 | string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); | |
964 | filter_string_list(&ceiling_dirs, 0, | |
965 | canonicalize_ceiling_entry, &empty_entry_found); | |
966 | ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs); | |
967 | string_list_clear(&ceiling_dirs, 0); | |
968 | } | |
969 | ||
970 | if (ceil_offset < 0) | |
971 | ceil_offset = min_offset - 2; | |
972 | ||
973 | if (min_offset && min_offset == dir->len && | |
974 | !is_dir_sep(dir->buf[min_offset - 1])) { | |
975 | strbuf_addch(dir, '/'); | |
976 | min_offset++; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Test in the following order (relative to the dir): | |
981 | * - .git (file containing "gitdir: <path>") | |
982 | * - .git/ | |
983 | * - ./ (bare) | |
984 | * - ../.git | |
985 | * - ../.git/ | |
986 | * - ../ (bare) | |
987 | * - ../../.git | |
988 | * etc. | |
989 | */ | |
990 | one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); | |
991 | if (one_filesystem) | |
992 | current_device = get_device_or_die(dir->buf, NULL, 0); | |
993 | for (;;) { | |
994 | int offset = dir->len, error_code = 0; | |
995 | ||
996 | if (offset > min_offset) | |
997 | strbuf_addch(dir, '/'); | |
998 | strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT); | |
999 | gitdirenv = read_gitfile_gently(dir->buf, die_on_error ? | |
1000 | NULL : &error_code); | |
1001 | if (!gitdirenv) { | |
1002 | if (die_on_error || | |
1003 | error_code == READ_GITFILE_ERR_NOT_A_FILE) { | |
1004 | /* NEEDSWORK: fail if .git is not file nor dir */ | |
1005 | if (is_git_directory(dir->buf)) | |
1006 | gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; | |
1007 | } else if (error_code != READ_GITFILE_ERR_STAT_FAILED) | |
1008 | return GIT_DIR_INVALID_GITFILE; | |
1009 | } | |
1010 | strbuf_setlen(dir, offset); | |
1011 | if (gitdirenv) { | |
1012 | strbuf_addstr(gitdir, gitdirenv); | |
1013 | return GIT_DIR_DISCOVERED; | |
1014 | } | |
1015 | ||
1016 | if (is_git_directory(dir->buf)) { | |
1017 | strbuf_addstr(gitdir, "."); | |
1018 | return GIT_DIR_BARE; | |
1019 | } | |
1020 | ||
1021 | if (offset <= min_offset) | |
1022 | return GIT_DIR_HIT_CEILING; | |
1023 | ||
1024 | while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset])) | |
1025 | ; /* continue */ | |
1026 | if (offset <= ceil_offset) | |
1027 | return GIT_DIR_HIT_CEILING; | |
1028 | ||
1029 | strbuf_setlen(dir, offset > min_offset ? offset : min_offset); | |
1030 | if (one_filesystem && | |
1031 | current_device != get_device_or_die(dir->buf, NULL, offset)) | |
1032 | return GIT_DIR_HIT_MOUNT_POINT; | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | int discover_git_directory(struct strbuf *commondir, | |
1037 | struct strbuf *gitdir) | |
1038 | { | |
1039 | struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; | |
1040 | size_t gitdir_offset = gitdir->len, cwd_len; | |
1041 | size_t commondir_offset = commondir->len; | |
1042 | struct repository_format candidate = REPOSITORY_FORMAT_INIT; | |
1043 | ||
1044 | if (strbuf_getcwd(&dir)) | |
1045 | return -1; | |
1046 | ||
1047 | cwd_len = dir.len; | |
1048 | if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) { | |
1049 | strbuf_release(&dir); | |
1050 | return -1; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * The returned gitdir is relative to dir, and if dir does not reflect | |
1055 | * the current working directory, we simply make the gitdir absolute. | |
1056 | */ | |
1057 | if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) { | |
1058 | /* Avoid a trailing "/." */ | |
1059 | if (!strcmp(".", gitdir->buf + gitdir_offset)) | |
1060 | strbuf_setlen(gitdir, gitdir_offset); | |
1061 | else | |
1062 | strbuf_addch(&dir, '/'); | |
1063 | strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len); | |
1064 | } | |
1065 | ||
1066 | get_common_dir(commondir, gitdir->buf + gitdir_offset); | |
1067 | ||
1068 | strbuf_reset(&dir); | |
1069 | strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset); | |
1070 | read_repository_format(&candidate, dir.buf); | |
1071 | strbuf_release(&dir); | |
1072 | ||
1073 | if (verify_repository_format(&candidate, &err) < 0) { | |
1074 | warning("ignoring git dir '%s': %s", | |
1075 | gitdir->buf + gitdir_offset, err.buf); | |
1076 | strbuf_release(&err); | |
1077 | strbuf_setlen(commondir, commondir_offset); | |
1078 | strbuf_setlen(gitdir, gitdir_offset); | |
1079 | clear_repository_format(&candidate); | |
1080 | return -1; | |
1081 | } | |
1082 | ||
1083 | clear_repository_format(&candidate); | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | const char *setup_git_directory_gently(int *nongit_ok) | |
1088 | { | |
1089 | static struct strbuf cwd = STRBUF_INIT; | |
1090 | struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; | |
1091 | const char *prefix = NULL; | |
1092 | struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; | |
1093 | ||
1094 | /* | |
1095 | * We may have read an incomplete configuration before | |
1096 | * setting-up the git directory. If so, clear the cache so | |
1097 | * that the next queries to the configuration reload complete | |
1098 | * configuration (including the per-repo config file that we | |
1099 | * ignored previously). | |
1100 | */ | |
1101 | git_config_clear(); | |
1102 | ||
1103 | /* | |
1104 | * Let's assume that we are in a git repository. | |
1105 | * If it turns out later that we are somewhere else, the value will be | |
1106 | * updated accordingly. | |
1107 | */ | |
1108 | if (nongit_ok) | |
1109 | *nongit_ok = 0; | |
1110 | ||
1111 | if (strbuf_getcwd(&cwd)) | |
1112 | die_errno(_("Unable to read current working directory")); | |
1113 | strbuf_addbuf(&dir, &cwd); | |
1114 | ||
1115 | switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) { | |
1116 | case GIT_DIR_EXPLICIT: | |
1117 | prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok); | |
1118 | break; | |
1119 | case GIT_DIR_DISCOVERED: | |
1120 | if (dir.len < cwd.len && chdir(dir.buf)) | |
1121 | die(_("cannot change to '%s'"), dir.buf); | |
1122 | prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len, | |
1123 | &repo_fmt, nongit_ok); | |
1124 | break; | |
1125 | case GIT_DIR_BARE: | |
1126 | if (dir.len < cwd.len && chdir(dir.buf)) | |
1127 | die(_("cannot change to '%s'"), dir.buf); | |
1128 | prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok); | |
1129 | break; | |
1130 | case GIT_DIR_HIT_CEILING: | |
1131 | if (!nongit_ok) | |
1132 | die(_("not a git repository (or any of the parent directories): %s"), | |
1133 | DEFAULT_GIT_DIR_ENVIRONMENT); | |
1134 | *nongit_ok = 1; | |
1135 | break; | |
1136 | case GIT_DIR_HIT_MOUNT_POINT: | |
1137 | if (!nongit_ok) | |
1138 | die(_("not a git repository (or any parent up to mount point %s)\n" | |
1139 | "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."), | |
1140 | dir.buf); | |
1141 | *nongit_ok = 1; | |
1142 | break; | |
1143 | case GIT_DIR_NONE: | |
1144 | /* | |
1145 | * As a safeguard against setup_git_directory_gently_1 returning | |
1146 | * this value, fallthrough to BUG. Otherwise it is possible to | |
1147 | * set startup_info->have_repository to 1 when we did nothing to | |
1148 | * find a repository. | |
1149 | */ | |
1150 | default: | |
1151 | BUG("unhandled setup_git_directory_1() result"); | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * At this point, nongit_ok is stable. If it is non-NULL and points | |
1156 | * to a non-zero value, then this means that we haven't found a | |
1157 | * repository and that the caller expects startup_info to reflect | |
1158 | * this. | |
1159 | * | |
1160 | * Regardless of the state of nongit_ok, startup_info->prefix and | |
1161 | * the GIT_PREFIX environment variable must always match. For details | |
1162 | * see Documentation/config/alias.txt. | |
1163 | */ | |
1164 | if (nongit_ok && *nongit_ok) { | |
1165 | startup_info->have_repository = 0; | |
1166 | startup_info->prefix = NULL; | |
1167 | setenv(GIT_PREFIX_ENVIRONMENT, "", 1); | |
1168 | } else { | |
1169 | startup_info->have_repository = 1; | |
1170 | startup_info->prefix = prefix; | |
1171 | if (prefix) | |
1172 | setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); | |
1173 | else | |
1174 | setenv(GIT_PREFIX_ENVIRONMENT, "", 1); | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * Not all paths through the setup code will call 'set_git_dir()' (which | |
1179 | * directly sets up the environment) so in order to guarantee that the | |
1180 | * environment is in a consistent state after setup, explicitly setup | |
1181 | * the environment if we have a repository. | |
1182 | * | |
1183 | * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some | |
1184 | * code paths so we also need to explicitly setup the environment if | |
1185 | * the user has set GIT_DIR. It may be beneficial to disallow bogus | |
1186 | * GIT_DIR values at some point in the future. | |
1187 | */ | |
1188 | if (/* GIT_DIR_EXPLICIT, GIT_DIR_DISCOVERED, GIT_DIR_BARE */ | |
1189 | startup_info->have_repository || | |
1190 | /* GIT_DIR_EXPLICIT */ | |
1191 | getenv(GIT_DIR_ENVIRONMENT)) { | |
1192 | if (!the_repository->gitdir) { | |
1193 | const char *gitdir = getenv(GIT_DIR_ENVIRONMENT); | |
1194 | if (!gitdir) | |
1195 | gitdir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
1196 | setup_git_env(gitdir); | |
1197 | } | |
1198 | if (startup_info->have_repository) | |
1199 | repo_set_hash_algo(the_repository, repo_fmt.hash_algo); | |
1200 | } | |
1201 | ||
1202 | strbuf_release(&dir); | |
1203 | strbuf_release(&gitdir); | |
1204 | clear_repository_format(&repo_fmt); | |
1205 | ||
1206 | return prefix; | |
1207 | } | |
1208 | ||
1209 | int git_config_perm(const char *var, const char *value) | |
1210 | { | |
1211 | int i; | |
1212 | char *endptr; | |
1213 | ||
1214 | if (value == NULL) | |
1215 | return PERM_GROUP; | |
1216 | ||
1217 | if (!strcmp(value, "umask")) | |
1218 | return PERM_UMASK; | |
1219 | if (!strcmp(value, "group")) | |
1220 | return PERM_GROUP; | |
1221 | if (!strcmp(value, "all") || | |
1222 | !strcmp(value, "world") || | |
1223 | !strcmp(value, "everybody")) | |
1224 | return PERM_EVERYBODY; | |
1225 | ||
1226 | /* Parse octal numbers */ | |
1227 | i = strtol(value, &endptr, 8); | |
1228 | ||
1229 | /* If not an octal number, maybe true/false? */ | |
1230 | if (*endptr != 0) | |
1231 | return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; | |
1232 | ||
1233 | /* | |
1234 | * Treat values 0, 1 and 2 as compatibility cases, otherwise it is | |
1235 | * a chmod value to restrict to. | |
1236 | */ | |
1237 | switch (i) { | |
1238 | case PERM_UMASK: /* 0 */ | |
1239 | return PERM_UMASK; | |
1240 | case OLD_PERM_GROUP: /* 1 */ | |
1241 | return PERM_GROUP; | |
1242 | case OLD_PERM_EVERYBODY: /* 2 */ | |
1243 | return PERM_EVERYBODY; | |
1244 | } | |
1245 | ||
1246 | /* A filemode value was given: 0xxx */ | |
1247 | ||
1248 | if ((i & 0600) != 0600) | |
1249 | die(_("problem with core.sharedRepository filemode value " | |
1250 | "(0%.3o).\nThe owner of files must always have " | |
1251 | "read and write permissions."), i); | |
1252 | ||
1253 | /* | |
1254 | * Mask filemode value. Others can not get write permission. | |
1255 | * x flags for directories are handled separately. | |
1256 | */ | |
1257 | return -(i & 0666); | |
1258 | } | |
1259 | ||
1260 | void check_repository_format(void) | |
1261 | { | |
1262 | struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; | |
1263 | check_repository_format_gently(get_git_dir(), &repo_fmt, NULL); | |
1264 | startup_info->have_repository = 1; | |
1265 | clear_repository_format(&repo_fmt); | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Returns the "prefix", a path to the current working directory | |
1270 | * relative to the work tree root, or NULL, if the current working | |
1271 | * directory is not a strict subdirectory of the work tree root. The | |
1272 | * prefix always ends with a '/' character. | |
1273 | */ | |
1274 | const char *setup_git_directory(void) | |
1275 | { | |
1276 | return setup_git_directory_gently(NULL); | |
1277 | } | |
1278 | ||
1279 | const char *resolve_gitdir_gently(const char *suspect, int *return_error_code) | |
1280 | { | |
1281 | if (is_git_directory(suspect)) | |
1282 | return suspect; | |
1283 | return read_gitfile_gently(suspect, return_error_code); | |
1284 | } | |
1285 | ||
1286 | /* if any standard file descriptor is missing open it to /dev/null */ | |
1287 | void sanitize_stdfds(void) | |
1288 | { | |
1289 | int fd = open("/dev/null", O_RDWR, 0); | |
1290 | while (fd != -1 && fd < 2) | |
1291 | fd = dup(fd); | |
1292 | if (fd == -1) | |
1293 | die_errno(_("open /dev/null or dup failed")); | |
1294 | if (fd > 2) | |
1295 | close(fd); | |
1296 | } | |
1297 | ||
1298 | int daemonize(void) | |
1299 | { | |
1300 | #ifdef NO_POSIX_GOODIES | |
1301 | errno = ENOSYS; | |
1302 | return -1; | |
1303 | #else | |
1304 | switch (fork()) { | |
1305 | case 0: | |
1306 | break; | |
1307 | case -1: | |
1308 | die_errno(_("fork failed")); | |
1309 | default: | |
1310 | exit(0); | |
1311 | } | |
1312 | if (setsid() == -1) | |
1313 | die_errno(_("setsid failed")); | |
1314 | close(0); | |
1315 | close(1); | |
1316 | close(2); | |
1317 | sanitize_stdfds(); | |
1318 | return 0; | |
1319 | #endif | |
1320 | } |