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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 | struct strbuf realpath = STRBUF_INIT; | |
36 | ||
37 | if (!work_tree) | |
38 | return -1; | |
39 | wtlen = strlen(work_tree); | |
40 | len = strlen(path); | |
41 | off = offset_1st_component(path); | |
42 | ||
43 | /* check if work tree is already the prefix */ | |
44 | if (wtlen <= len && !fspathncmp(path, work_tree, wtlen)) { | |
45 | if (path[wtlen] == '/') { | |
46 | memmove(path, path + wtlen + 1, len - wtlen); | |
47 | return 0; | |
48 | } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') { | |
49 | /* work tree is the root, or the whole path */ | |
50 | memmove(path, path + wtlen, len - wtlen + 1); | |
51 | return 0; | |
52 | } | |
53 | /* work tree might match beginning of a symlink to work tree */ | |
54 | off = wtlen; | |
55 | } | |
56 | path0 = path; | |
57 | path += off; | |
58 | ||
59 | /* check each '/'-terminated level */ | |
60 | while (*path) { | |
61 | path++; | |
62 | if (*path == '/') { | |
63 | *path = '\0'; | |
64 | strbuf_realpath(&realpath, path0, 1); | |
65 | if (fspathcmp(realpath.buf, work_tree) == 0) { | |
66 | memmove(path0, path + 1, len - (path - path0)); | |
67 | strbuf_release(&realpath); | |
68 | return 0; | |
69 | } | |
70 | *path = '/'; | |
71 | } | |
72 | } | |
73 | ||
74 | /* check whole path */ | |
75 | strbuf_realpath(&realpath, path0, 1); | |
76 | if (fspathcmp(realpath.buf, work_tree) == 0) { | |
77 | *path0 = '\0'; | |
78 | strbuf_release(&realpath); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | strbuf_release(&realpath); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Normalize "path", prepending the "prefix" for relative paths. If | |
88 | * remaining_prefix is not NULL, return the actual prefix still | |
89 | * remains in the path. For example, prefix = sub1/sub2/ and path is | |
90 | * | |
91 | * foo -> sub1/sub2/foo (full prefix) | |
92 | * ../foo -> sub1/foo (remaining prefix is sub1/) | |
93 | * ../../bar -> bar (no remaining prefix) | |
94 | * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) | |
95 | * `pwd`/../bar -> sub1/bar (no remaining prefix) | |
96 | */ | |
97 | char *prefix_path_gently(const char *prefix, int len, | |
98 | int *remaining_prefix, const char *path) | |
99 | { | |
100 | const char *orig = path; | |
101 | char *sanitized; | |
102 | if (is_absolute_path(orig)) { | |
103 | sanitized = xmallocz(strlen(path)); | |
104 | if (remaining_prefix) | |
105 | *remaining_prefix = 0; | |
106 | if (normalize_path_copy_len(sanitized, path, remaining_prefix)) { | |
107 | free(sanitized); | |
108 | return NULL; | |
109 | } | |
110 | if (abspath_part_inside_repo(sanitized)) { | |
111 | free(sanitized); | |
112 | return NULL; | |
113 | } | |
114 | } else { | |
115 | sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path); | |
116 | if (remaining_prefix) | |
117 | *remaining_prefix = len; | |
118 | if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { | |
119 | free(sanitized); | |
120 | return NULL; | |
121 | } | |
122 | } | |
123 | return sanitized; | |
124 | } | |
125 | ||
126 | char *prefix_path(const char *prefix, int len, const char *path) | |
127 | { | |
128 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
129 | if (!r) { | |
130 | const char *hint_path = get_git_work_tree(); | |
131 | if (!hint_path) | |
132 | hint_path = get_git_dir(); | |
133 | die(_("'%s' is outside repository at '%s'"), path, | |
134 | absolute_path(hint_path)); | |
135 | } | |
136 | return r; | |
137 | } | |
138 | ||
139 | int path_inside_repo(const char *prefix, const char *path) | |
140 | { | |
141 | int len = prefix ? strlen(prefix) : 0; | |
142 | char *r = prefix_path_gently(prefix, len, NULL, path); | |
143 | if (r) { | |
144 | free(r); | |
145 | return 1; | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
150 | int check_filename(const char *prefix, const char *arg) | |
151 | { | |
152 | char *to_free = NULL; | |
153 | struct stat st; | |
154 | ||
155 | if (skip_prefix(arg, ":/", &arg)) { | |
156 | if (!*arg) /* ":/" is root dir, always exists */ | |
157 | return 1; | |
158 | prefix = NULL; | |
159 | } else if (skip_prefix(arg, ":!", &arg) || | |
160 | skip_prefix(arg, ":^", &arg)) { | |
161 | if (!*arg) /* excluding everything is silly, but allowed */ | |
162 | return 1; | |
163 | } | |
164 | ||
165 | if (prefix) | |
166 | arg = to_free = prefix_filename(prefix, arg); | |
167 | ||
168 | if (!lstat(arg, &st)) { | |
169 | free(to_free); | |
170 | return 1; /* file exists */ | |
171 | } | |
172 | if (is_missing_file_error(errno)) { | |
173 | free(to_free); | |
174 | return 0; /* file does not exist */ | |
175 | } | |
176 | die_errno(_("failed to stat '%s'"), arg); | |
177 | } | |
178 | ||
179 | static void NORETURN die_verify_filename(struct repository *r, | |
180 | const char *prefix, | |
181 | const char *arg, | |
182 | int diagnose_misspelt_rev) | |
183 | { | |
184 | if (!diagnose_misspelt_rev) | |
185 | die(_("%s: no such path in the working tree.\n" | |
186 | "Use 'git <command> -- <path>...' to specify paths that do not exist locally."), | |
187 | arg); | |
188 | /* | |
189 | * Saying "'(icase)foo' does not exist in the index" when the | |
190 | * user gave us ":(icase)foo" is just stupid. A magic pathspec | |
191 | * begins with a colon and is followed by a non-alnum; do not | |
192 | * let maybe_die_on_misspelt_object_name() even trigger. | |
193 | */ | |
194 | if (!(arg[0] == ':' && !isalnum(arg[1]))) | |
195 | maybe_die_on_misspelt_object_name(r, arg, prefix); | |
196 | ||
197 | /* ... or fall back the most general message. */ | |
198 | die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n" | |
199 | "Use '--' to separate paths from revisions, like this:\n" | |
200 | "'git <command> [<revision>...] -- [<file>...]'"), arg); | |
201 | ||
202 | } | |
203 | ||
204 | /* | |
205 | * Check for arguments that don't resolve as actual files, | |
206 | * but which look sufficiently like pathspecs that we'll consider | |
207 | * them such for the purposes of rev/pathspec DWIM parsing. | |
208 | */ | |
209 | static int looks_like_pathspec(const char *arg) | |
210 | { | |
211 | const char *p; | |
212 | int escaped = 0; | |
213 | ||
214 | /* | |
215 | * Wildcard characters imply the user is looking to match pathspecs | |
216 | * that aren't in the filesystem. Note that this doesn't include | |
217 | * backslash even though it's a glob special; by itself it doesn't | |
218 | * cause any increase in the match. Likewise ignore backslash-escaped | |
219 | * wildcard characters. | |
220 | */ | |
221 | for (p = arg; *p; p++) { | |
222 | if (escaped) { | |
223 | escaped = 0; | |
224 | } else if (is_glob_special(*p)) { | |
225 | if (*p == '\\') | |
226 | escaped = 1; | |
227 | else | |
228 | return 1; | |
229 | } | |
230 | } | |
231 | ||
232 | /* long-form pathspec magic */ | |
233 | if (starts_with(arg, ":(")) | |
234 | return 1; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Verify a filename that we got as an argument for a pathspec | |
241 | * entry. Note that a filename that begins with "-" never verifies | |
242 | * as true, because even if such a filename were to exist, we want | |
243 | * it to be preceded by the "--" marker (or we want the user to | |
244 | * use a format like "./-filename") | |
245 | * | |
246 | * The "diagnose_misspelt_rev" is used to provide a user-friendly | |
247 | * diagnosis when dying upon finding that "name" is not a pathname. | |
248 | * If set to 1, the diagnosis will try to diagnose "name" as an | |
249 | * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis | |
250 | * will only complain about an inexisting file. | |
251 | * | |
252 | * This function is typically called to check that a "file or rev" | |
253 | * argument is unambiguous. In this case, the caller will want | |
254 | * diagnose_misspelt_rev == 1 when verifying the first non-rev | |
255 | * argument (which could have been a revision), and | |
256 | * diagnose_misspelt_rev == 0 for the next ones (because we already | |
257 | * saw a filename, there's not ambiguity anymore). | |
258 | */ | |
259 | void verify_filename(const char *prefix, | |
260 | const char *arg, | |
261 | int diagnose_misspelt_rev) | |
262 | { | |
263 | if (*arg == '-') | |
264 | die(_("option '%s' must come before non-option arguments"), arg); | |
265 | if (looks_like_pathspec(arg) || check_filename(prefix, arg)) | |
266 | return; | |
267 | die_verify_filename(the_repository, prefix, arg, diagnose_misspelt_rev); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Opposite of the above: the command line did not have -- marker | |
272 | * and we parsed the arg as a refname. It should not be interpretable | |
273 | * as a filename. | |
274 | */ | |
275 | void verify_non_filename(const char *prefix, const char *arg) | |
276 | { | |
277 | if (!is_inside_work_tree() || is_inside_git_dir()) | |
278 | return; | |
279 | if (*arg == '-') | |
280 | return; /* flag */ | |
281 | if (!check_filename(prefix, arg)) | |
282 | return; | |
283 | die(_("ambiguous argument '%s': both revision and filename\n" | |
284 | "Use '--' to separate paths from revisions, like this:\n" | |
285 | "'git <command> [<revision>...] -- [<file>...]'"), arg); | |
286 | } | |
287 | ||
288 | int get_common_dir(struct strbuf *sb, const char *gitdir) | |
289 | { | |
290 | const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT); | |
291 | if (git_env_common_dir) { | |
292 | strbuf_addstr(sb, git_env_common_dir); | |
293 | return 1; | |
294 | } else { | |
295 | return get_common_dir_noenv(sb, gitdir); | |
296 | } | |
297 | } | |
298 | ||
299 | int get_common_dir_noenv(struct strbuf *sb, const char *gitdir) | |
300 | { | |
301 | struct strbuf data = STRBUF_INIT; | |
302 | struct strbuf path = STRBUF_INIT; | |
303 | int ret = 0; | |
304 | ||
305 | strbuf_addf(&path, "%s/commondir", gitdir); | |
306 | if (file_exists(path.buf)) { | |
307 | if (strbuf_read_file(&data, path.buf, 0) <= 0) | |
308 | die_errno(_("failed to read %s"), path.buf); | |
309 | while (data.len && (data.buf[data.len - 1] == '\n' || | |
310 | data.buf[data.len - 1] == '\r')) | |
311 | data.len--; | |
312 | data.buf[data.len] = '\0'; | |
313 | strbuf_reset(&path); | |
314 | if (!is_absolute_path(data.buf)) | |
315 | strbuf_addf(&path, "%s/", gitdir); | |
316 | strbuf_addbuf(&path, &data); | |
317 | strbuf_add_real_path(sb, path.buf); | |
318 | ret = 1; | |
319 | } else { | |
320 | strbuf_addstr(sb, gitdir); | |
321 | } | |
322 | ||
323 | strbuf_release(&data); | |
324 | strbuf_release(&path); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Test if it looks like we're at a git directory. | |
330 | * We want to see: | |
331 | * | |
332 | * - either an objects/ directory _or_ the proper | |
333 | * GIT_OBJECT_DIRECTORY environment variable | |
334 | * - a refs/ directory | |
335 | * - either a HEAD symlink or a HEAD file that is formatted as | |
336 | * a proper "ref:", or a regular file HEAD that has a properly | |
337 | * formatted sha1 object name. | |
338 | */ | |
339 | int is_git_directory(const char *suspect) | |
340 | { | |
341 | struct strbuf path = STRBUF_INIT; | |
342 | int ret = 0; | |
343 | size_t len; | |
344 | ||
345 | /* Check worktree-related signatures */ | |
346 | strbuf_addstr(&path, suspect); | |
347 | strbuf_complete(&path, '/'); | |
348 | strbuf_addstr(&path, "HEAD"); | |
349 | if (validate_headref(path.buf)) | |
350 | goto done; | |
351 | ||
352 | strbuf_reset(&path); | |
353 | get_common_dir(&path, suspect); | |
354 | len = path.len; | |
355 | ||
356 | /* Check non-worktree-related signatures */ | |
357 | if (getenv(DB_ENVIRONMENT)) { | |
358 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
359 | goto done; | |
360 | } | |
361 | else { | |
362 | strbuf_setlen(&path, len); | |
363 | strbuf_addstr(&path, "/objects"); | |
364 | if (access(path.buf, X_OK)) | |
365 | goto done; | |
366 | } | |
367 | ||
368 | strbuf_setlen(&path, len); | |
369 | strbuf_addstr(&path, "/refs"); | |
370 | if (access(path.buf, X_OK)) | |
371 | goto done; | |
372 | ||
373 | ret = 1; | |
374 | done: | |
375 | strbuf_release(&path); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | int is_nonbare_repository_dir(struct strbuf *path) | |
380 | { | |
381 | int ret = 0; | |
382 | int gitfile_error; | |
383 | size_t orig_path_len = path->len; | |
384 | assert(orig_path_len != 0); | |
385 | strbuf_complete(path, '/'); | |
386 | strbuf_addstr(path, ".git"); | |
387 | if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf)) | |
388 | ret = 1; | |
389 | if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED || | |
390 | gitfile_error == READ_GITFILE_ERR_READ_FAILED) | |
391 | ret = 1; | |
392 | strbuf_setlen(path, orig_path_len); | |
393 | return ret; | |
394 | } | |
395 | ||
396 | int is_inside_git_dir(void) | |
397 | { | |
398 | if (inside_git_dir < 0) | |
399 | inside_git_dir = is_inside_dir(get_git_dir()); | |
400 | return inside_git_dir; | |
401 | } | |
402 | ||
403 | int is_inside_work_tree(void) | |
404 | { | |
405 | if (inside_work_tree < 0) | |
406 | inside_work_tree = is_inside_dir(get_git_work_tree()); | |
407 | return inside_work_tree; | |
408 | } | |
409 | ||
410 | void setup_work_tree(void) | |
411 | { | |
412 | const char *work_tree; | |
413 | static int initialized = 0; | |
414 | ||
415 | if (initialized) | |
416 | return; | |
417 | ||
418 | if (work_tree_config_is_bogus) | |
419 | die(_("unable to set up work tree using invalid config")); | |
420 | ||
421 | work_tree = get_git_work_tree(); | |
422 | if (!work_tree || chdir_notify(work_tree)) | |
423 | die(_("this operation must be run in a work tree")); | |
424 | ||
425 | /* | |
426 | * Make sure subsequent git processes find correct worktree | |
427 | * if $GIT_WORK_TREE is set relative | |
428 | */ | |
429 | if (getenv(GIT_WORK_TREE_ENVIRONMENT)) | |
430 | setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); | |
431 | ||
432 | initialized = 1; | |
433 | } | |
434 | ||
435 | static int read_worktree_config(const char *var, const char *value, void *vdata) | |
436 | { | |
437 | struct repository_format *data = vdata; | |
438 | ||
439 | if (strcmp(var, "core.bare") == 0) { | |
440 | data->is_bare = git_config_bool(var, value); | |
441 | } else if (strcmp(var, "core.worktree") == 0) { | |
442 | if (!value) | |
443 | return config_error_nonbool(var); | |
444 | free(data->work_tree); | |
445 | data->work_tree = xstrdup(value); | |
446 | } | |
447 | return 0; | |
448 | } | |
449 | ||
450 | enum extension_result { | |
451 | EXTENSION_ERROR = -1, /* compatible with error(), etc */ | |
452 | EXTENSION_UNKNOWN = 0, | |
453 | EXTENSION_OK = 1 | |
454 | }; | |
455 | ||
456 | /* | |
457 | * Do not add new extensions to this function. It handles extensions which are | |
458 | * respected even in v0-format repositories for historical compatibility. | |
459 | */ | |
460 | static enum extension_result handle_extension_v0(const char *var, | |
461 | const char *value, | |
462 | const char *ext, | |
463 | struct repository_format *data) | |
464 | { | |
465 | if (!strcmp(ext, "noop")) { | |
466 | return EXTENSION_OK; | |
467 | } else if (!strcmp(ext, "preciousobjects")) { | |
468 | data->precious_objects = git_config_bool(var, value); | |
469 | return EXTENSION_OK; | |
470 | } else if (!strcmp(ext, "partialclone")) { | |
471 | data->partial_clone = xstrdup(value); | |
472 | return EXTENSION_OK; | |
473 | } else if (!strcmp(ext, "worktreeconfig")) { | |
474 | data->worktree_config = git_config_bool(var, value); | |
475 | return EXTENSION_OK; | |
476 | } | |
477 | ||
478 | return EXTENSION_UNKNOWN; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Record any new extensions in this function. | |
483 | */ | |
484 | static enum extension_result handle_extension(const char *var, | |
485 | const char *value, | |
486 | const char *ext, | |
487 | struct repository_format *data) | |
488 | { | |
489 | if (!strcmp(ext, "noop-v1")) { | |
490 | return EXTENSION_OK; | |
491 | } else if (!strcmp(ext, "objectformat")) { | |
492 | int format; | |
493 | ||
494 | if (!value) | |
495 | return config_error_nonbool(var); | |
496 | format = hash_algo_by_name(value); | |
497 | if (format == GIT_HASH_UNKNOWN) | |
498 | return error("invalid value for 'extensions.objectformat'"); | |
499 | data->hash_algo = format; | |
500 | return EXTENSION_OK; | |
501 | } | |
502 | return EXTENSION_UNKNOWN; | |
503 | } | |
504 | ||
505 | static int check_repo_format(const char *var, const char *value, void *vdata) | |
506 | { | |
507 | struct repository_format *data = vdata; | |
508 | const char *ext; | |
509 | ||
510 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
511 | data->version = git_config_int(var, value); | |
512 | else if (skip_prefix(var, "extensions.", &ext)) { | |
513 | switch (handle_extension_v0(var, value, ext, data)) { | |
514 | case EXTENSION_ERROR: | |
515 | return -1; | |
516 | case EXTENSION_OK: | |
517 | return 0; | |
518 | case EXTENSION_UNKNOWN: | |
519 | break; | |
520 | } | |
521 | ||
522 | switch (handle_extension(var, value, ext, data)) { | |
523 | case EXTENSION_ERROR: | |
524 | return -1; | |
525 | case EXTENSION_OK: | |
526 | string_list_append(&data->v1_only_extensions, ext); | |
527 | return 0; | |
528 | case EXTENSION_UNKNOWN: | |
529 | string_list_append(&data->unknown_extensions, ext); | |
530 | return 0; | |
531 | } | |
532 | } | |
533 | ||
534 | return read_worktree_config(var, value, vdata); | |
535 | } | |
536 | ||
537 | static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok) | |
538 | { | |
539 | struct strbuf sb = STRBUF_INIT; | |
540 | struct strbuf err = STRBUF_INIT; | |
541 | int has_common; | |
542 | ||
543 | has_common = get_common_dir(&sb, gitdir); | |
544 | strbuf_addstr(&sb, "/config"); | |
545 | read_repository_format(candidate, sb.buf); | |
546 | strbuf_release(&sb); | |
547 | ||
548 | /* | |
549 | * For historical use of check_repository_format() in git-init, | |
550 | * we treat a missing config as a silent "ok", even when nongit_ok | |
551 | * is unset. | |
552 | */ | |
553 | if (candidate->version < 0) | |
554 | return 0; | |
555 | ||
556 | if (verify_repository_format(candidate, &err) < 0) { | |
557 | if (nongit_ok) { | |
558 | warning("%s", err.buf); | |
559 | strbuf_release(&err); | |
560 | *nongit_ok = -1; | |
561 | return -1; | |
562 | } | |
563 | die("%s", err.buf); | |
564 | } | |
565 | ||
566 | repository_format_precious_objects = candidate->precious_objects; | |
567 | repository_format_worktree_config = candidate->worktree_config; | |
568 | string_list_clear(&candidate->unknown_extensions, 0); | |
569 | string_list_clear(&candidate->v1_only_extensions, 0); | |
570 | ||
571 | if (repository_format_worktree_config) { | |
572 | /* | |
573 | * pick up core.bare and core.worktree from per-worktree | |
574 | * config if present | |
575 | */ | |
576 | strbuf_addf(&sb, "%s/config.worktree", gitdir); | |
577 | git_config_from_file(read_worktree_config, sb.buf, candidate); | |
578 | strbuf_release(&sb); | |
579 | has_common = 0; | |
580 | } | |
581 | ||
582 | if (!has_common) { | |
583 | if (candidate->is_bare != -1) { | |
584 | is_bare_repository_cfg = candidate->is_bare; | |
585 | if (is_bare_repository_cfg == 1) | |
586 | inside_work_tree = -1; | |
587 | } | |
588 | if (candidate->work_tree) { | |
589 | free(git_work_tree_cfg); | |
590 | git_work_tree_cfg = xstrdup(candidate->work_tree); | |
591 | inside_work_tree = -1; | |
592 | } | |
593 | } | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | int upgrade_repository_format(int target_version) | |
599 | { | |
600 | struct strbuf sb = STRBUF_INIT; | |
601 | struct strbuf err = STRBUF_INIT; | |
602 | struct strbuf repo_version = STRBUF_INIT; | |
603 | struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; | |
604 | ||
605 | strbuf_git_common_path(&sb, the_repository, "config"); | |
606 | read_repository_format(&repo_fmt, sb.buf); | |
607 | strbuf_release(&sb); | |
608 | ||
609 | if (repo_fmt.version >= target_version) | |
610 | return 0; | |
611 | ||
612 | if (verify_repository_format(&repo_fmt, &err) < 0) { | |
613 | error("cannot upgrade repository format from %d to %d: %s", | |
614 | repo_fmt.version, target_version, err.buf); | |
615 | strbuf_release(&err); | |
616 | return -1; | |
617 | } | |
618 | if (!repo_fmt.version && repo_fmt.unknown_extensions.nr) | |
619 | return error("cannot upgrade repository format: " | |
620 | "unknown extension %s", | |
621 | repo_fmt.unknown_extensions.items[0].string); | |
622 | ||
623 | strbuf_addf(&repo_version, "%d", target_version); | |
624 | git_config_set("core.repositoryformatversion", repo_version.buf); | |
625 | strbuf_release(&repo_version); | |
626 | return 1; | |
627 | } | |
628 | ||
629 | static void init_repository_format(struct repository_format *format) | |
630 | { | |
631 | const struct repository_format fresh = REPOSITORY_FORMAT_INIT; | |
632 | ||
633 | memcpy(format, &fresh, sizeof(fresh)); | |
634 | } | |
635 | ||
636 | int read_repository_format(struct repository_format *format, const char *path) | |
637 | { | |
638 | clear_repository_format(format); | |
639 | git_config_from_file(check_repo_format, path, format); | |
640 | if (format->version == -1) | |
641 | clear_repository_format(format); | |
642 | return format->version; | |
643 | } | |
644 | ||
645 | void clear_repository_format(struct repository_format *format) | |
646 | { | |
647 | string_list_clear(&format->unknown_extensions, 0); | |
648 | string_list_clear(&format->v1_only_extensions, 0); | |
649 | free(format->work_tree); | |
650 | free(format->partial_clone); | |
651 | init_repository_format(format); | |
652 | } | |
653 | ||
654 | int verify_repository_format(const struct repository_format *format, | |
655 | struct strbuf *err) | |
656 | { | |
657 | if (GIT_REPO_VERSION_READ < format->version) { | |
658 | strbuf_addf(err, _("Expected git repo version <= %d, found %d"), | |
659 | GIT_REPO_VERSION_READ, format->version); | |
660 | return -1; | |
661 | } | |
662 | ||
663 | if (format->version >= 1 && format->unknown_extensions.nr) { | |
664 | int i; | |
665 | ||
666 | strbuf_addstr(err, Q_("unknown repository extension found:", | |
667 | "unknown repository extensions found:", | |
668 | format->unknown_extensions.nr)); | |
669 | ||
670 | for (i = 0; i < format->unknown_extensions.nr; i++) | |
671 | strbuf_addf(err, "\n\t%s", | |
672 | format->unknown_extensions.items[i].string); | |
673 | return -1; | |
674 | } | |
675 | ||
676 | if (format->version == 0 && format->v1_only_extensions.nr) { | |
677 | int i; | |
678 | ||
679 | strbuf_addstr(err, | |
680 | Q_("repo version is 0, but v1-only extension found:", | |
681 | "repo version is 0, but v1-only extensions found:", | |
682 | format->v1_only_extensions.nr)); | |
683 | ||
684 | for (i = 0; i < format->v1_only_extensions.nr; i++) | |
685 | strbuf_addf(err, "\n\t%s", | |
686 | format->v1_only_extensions.items[i].string); | |
687 | return -1; | |
688 | } | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | void read_gitfile_error_die(int error_code, const char *path, const char *dir) | |
694 | { | |
695 | switch (error_code) { | |
696 | case READ_GITFILE_ERR_STAT_FAILED: | |
697 | case READ_GITFILE_ERR_NOT_A_FILE: | |
698 | /* non-fatal; follow return path */ | |
699 | break; | |
700 | case READ_GITFILE_ERR_OPEN_FAILED: | |
701 | die_errno(_("error opening '%s'"), path); | |
702 | case READ_GITFILE_ERR_TOO_LARGE: | |
703 | die(_("too large to be a .git file: '%s'"), path); | |
704 | case READ_GITFILE_ERR_READ_FAILED: | |
705 | die(_("error reading %s"), path); | |
706 | case READ_GITFILE_ERR_INVALID_FORMAT: | |
707 | die(_("invalid gitfile format: %s"), path); | |
708 | case READ_GITFILE_ERR_NO_PATH: | |
709 | die(_("no path in gitfile: %s"), path); | |
710 | case READ_GITFILE_ERR_NOT_A_REPO: | |
711 | die(_("not a git repository: %s"), dir); | |
712 | default: | |
713 | BUG("unknown error code"); | |
714 | } | |
715 | } | |
716 | ||
717 | /* | |
718 | * Try to read the location of the git directory from the .git file, | |
719 | * return path to git directory if found. The return value comes from | |
720 | * a shared buffer. | |
721 | * | |
722 | * On failure, if return_error_code is not NULL, return_error_code | |
723 | * will be set to an error code and NULL will be returned. If | |
724 | * return_error_code is NULL the function will die instead (for most | |
725 | * cases). | |
726 | */ | |
727 | const char *read_gitfile_gently(const char *path, int *return_error_code) | |
728 | { | |
729 | const int max_file_size = 1 << 20; /* 1MB */ | |
730 | int error_code = 0; | |
731 | char *buf = NULL; | |
732 | char *dir = NULL; | |
733 | const char *slash; | |
734 | struct stat st; | |
735 | int fd; | |
736 | ssize_t len; | |
737 | static struct strbuf realpath = STRBUF_INIT; | |
738 | ||
739 | if (stat(path, &st)) { | |
740 | /* NEEDSWORK: discern between ENOENT vs other errors */ | |
741 | error_code = READ_GITFILE_ERR_STAT_FAILED; | |
742 | goto cleanup_return; | |
743 | } | |
744 | if (!S_ISREG(st.st_mode)) { | |
745 | error_code = READ_GITFILE_ERR_NOT_A_FILE; | |
746 | goto cleanup_return; | |
747 | } | |
748 | if (st.st_size > max_file_size) { | |
749 | error_code = READ_GITFILE_ERR_TOO_LARGE; | |
750 | goto cleanup_return; | |
751 | } | |
752 | fd = open(path, O_RDONLY); | |
753 | if (fd < 0) { | |
754 | error_code = READ_GITFILE_ERR_OPEN_FAILED; | |
755 | goto cleanup_return; | |
756 | } | |
757 | buf = xmallocz(st.st_size); | |
758 | len = read_in_full(fd, buf, st.st_size); | |
759 | close(fd); | |
760 | if (len != st.st_size) { | |
761 | error_code = READ_GITFILE_ERR_READ_FAILED; | |
762 | goto cleanup_return; | |
763 | } | |
764 | if (!starts_with(buf, "gitdir: ")) { | |
765 | error_code = READ_GITFILE_ERR_INVALID_FORMAT; | |
766 | goto cleanup_return; | |
767 | } | |
768 | while (buf[len - 1] == '\n' || buf[len - 1] == '\r') | |
769 | len--; | |
770 | if (len < 9) { | |
771 | error_code = READ_GITFILE_ERR_NO_PATH; | |
772 | goto cleanup_return; | |
773 | } | |
774 | buf[len] = '\0'; | |
775 | dir = buf + 8; | |
776 | ||
777 | if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { | |
778 | size_t pathlen = slash+1 - path; | |
779 | dir = xstrfmt("%.*s%.*s", (int)pathlen, path, | |
780 | (int)(len - 8), buf + 8); | |
781 | free(buf); | |
782 | buf = dir; | |
783 | } | |
784 | if (!is_git_directory(dir)) { | |
785 | error_code = READ_GITFILE_ERR_NOT_A_REPO; | |
786 | goto cleanup_return; | |
787 | } | |
788 | ||
789 | strbuf_realpath(&realpath, dir, 1); | |
790 | path = realpath.buf; | |
791 | ||
792 | cleanup_return: | |
793 | if (return_error_code) | |
794 | *return_error_code = error_code; | |
795 | else if (error_code) | |
796 | read_gitfile_error_die(error_code, path, dir); | |
797 | ||
798 | free(buf); | |
799 | return error_code ? NULL : path; | |
800 | } | |
801 | ||
802 | static const char *setup_explicit_git_dir(const char *gitdirenv, | |
803 | struct strbuf *cwd, | |
804 | struct repository_format *repo_fmt, | |
805 | int *nongit_ok) | |
806 | { | |
807 | const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); | |
808 | const char *worktree; | |
809 | char *gitfile; | |
810 | int offset; | |
811 | ||
812 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
813 | die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT); | |
814 | ||
815 | gitfile = (char*)read_gitfile(gitdirenv); | |
816 | if (gitfile) { | |
817 | gitfile = xstrdup(gitfile); | |
818 | gitdirenv = gitfile; | |
819 | } | |
820 | ||
821 | if (!is_git_directory(gitdirenv)) { | |
822 | if (nongit_ok) { | |
823 | *nongit_ok = 1; | |
824 | free(gitfile); | |
825 | return NULL; | |
826 | } | |
827 | die(_("not a git repository: '%s'"), gitdirenv); | |
828 | } | |
829 | ||
830 | if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) { | |
831 | free(gitfile); | |
832 | return NULL; | |
833 | } | |
834 | ||
835 | /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ | |
836 | if (work_tree_env) | |
837 | set_git_work_tree(work_tree_env); | |
838 | else if (is_bare_repository_cfg > 0) { | |
839 | if (git_work_tree_cfg) { | |
840 | /* #22.2, #30 */ | |
841 | warning("core.bare and core.worktree do not make sense"); | |
842 | work_tree_config_is_bogus = 1; | |
843 | } | |
844 | ||
845 | /* #18, #26 */ | |
846 | set_git_dir(gitdirenv, 0); | |
847 | free(gitfile); | |
848 | return NULL; | |
849 | } | |
850 | else if (git_work_tree_cfg) { /* #6, #14 */ | |
851 | if (is_absolute_path(git_work_tree_cfg)) | |
852 | set_git_work_tree(git_work_tree_cfg); | |
853 | else { | |
854 | char *core_worktree; | |
855 | if (chdir(gitdirenv)) | |
856 | die_errno(_("cannot chdir to '%s'"), gitdirenv); | |
857 | if (chdir(git_work_tree_cfg)) | |
858 | die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg); | |
859 | core_worktree = xgetcwd(); | |
860 | if (chdir(cwd->buf)) | |
861 | die_errno(_("cannot come back to cwd")); | |
862 | set_git_work_tree(core_worktree); | |
863 | free(core_worktree); | |
864 | } | |
865 | } | |
866 | else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) { | |
867 | /* #16d */ | |
868 | set_git_dir(gitdirenv, 0); | |
869 | free(gitfile); | |
870 | return NULL; | |
871 | } | |
872 | else /* #2, #10 */ | |
873 | set_git_work_tree("."); | |
874 | ||
875 | /* set_git_work_tree() must have been called by now */ | |
876 | worktree = get_git_work_tree(); | |
877 | ||
878 | /* both get_git_work_tree() and cwd are already normalized */ | |
879 | if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */ | |
880 | set_git_dir(gitdirenv, 0); | |
881 | free(gitfile); | |
882 | return NULL; | |
883 | } | |
884 | ||
885 | offset = dir_inside_of(cwd->buf, worktree); | |
886 | if (offset >= 0) { /* cwd inside worktree? */ | |
887 | set_git_dir(gitdirenv, 1); | |
888 | if (chdir(worktree)) | |
889 | die_errno(_("cannot chdir to '%s'"), worktree); | |
890 | strbuf_addch(cwd, '/'); | |
891 | free(gitfile); | |
892 | return cwd->buf + offset; | |
893 | } | |
894 | ||
895 | /* cwd outside worktree */ | |
896 | set_git_dir(gitdirenv, 0); | |
897 | free(gitfile); | |
898 | return NULL; | |
899 | } | |
900 | ||
901 | static const char *setup_discovered_git_dir(const char *gitdir, | |
902 | struct strbuf *cwd, int offset, | |
903 | struct repository_format *repo_fmt, | |
904 | int *nongit_ok) | |
905 | { | |
906 | if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok)) | |
907 | return NULL; | |
908 | ||
909 | /* --work-tree is set without --git-dir; use discovered one */ | |
910 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
911 | char *to_free = NULL; | |
912 | const char *ret; | |
913 | ||
914 | if (offset != cwd->len && !is_absolute_path(gitdir)) | |
915 | gitdir = to_free = real_pathdup(gitdir, 1); | |
916 | if (chdir(cwd->buf)) | |
917 | die_errno(_("cannot come back to cwd")); | |
918 | ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); | |
919 | free(to_free); | |
920 | return ret; | |
921 | } | |
922 | ||
923 | /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ | |
924 | if (is_bare_repository_cfg > 0) { | |
925 | set_git_dir(gitdir, (offset != cwd->len)); | |
926 | if (chdir(cwd->buf)) | |
927 | die_errno(_("cannot come back to cwd")); | |
928 | return NULL; | |
929 | } | |
930 | ||
931 | /* #0, #1, #5, #8, #9, #12, #13 */ | |
932 | set_git_work_tree("."); | |
933 | if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) | |
934 | set_git_dir(gitdir, 0); | |
935 | inside_git_dir = 0; | |
936 | inside_work_tree = 1; | |
937 | if (offset >= cwd->len) | |
938 | return NULL; | |
939 | ||
940 | /* Make "offset" point past the '/' (already the case for root dirs) */ | |
941 | if (offset != offset_1st_component(cwd->buf)) | |
942 | offset++; | |
943 | /* Add a '/' at the end */ | |
944 | strbuf_addch(cwd, '/'); | |
945 | return cwd->buf + offset; | |
946 | } | |
947 | ||
948 | /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ | |
949 | static const char *setup_bare_git_dir(struct strbuf *cwd, int offset, | |
950 | struct repository_format *repo_fmt, | |
951 | int *nongit_ok) | |
952 | { | |
953 | int root_len; | |
954 | ||
955 | if (check_repository_format_gently(".", repo_fmt, nongit_ok)) | |
956 | return NULL; | |
957 | ||
958 | setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); | |
959 | ||
960 | /* --work-tree is set without --git-dir; use discovered one */ | |
961 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
962 | static const char *gitdir; | |
963 | ||
964 | gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset); | |
965 | if (chdir(cwd->buf)) | |
966 | die_errno(_("cannot come back to cwd")); | |
967 | return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); | |
968 | } | |
969 | ||
970 | inside_git_dir = 1; | |
971 | inside_work_tree = 0; | |
972 | if (offset != cwd->len) { | |
973 | if (chdir(cwd->buf)) | |
974 | die_errno(_("cannot come back to cwd")); | |
975 | root_len = offset_1st_component(cwd->buf); | |
976 | strbuf_setlen(cwd, offset > root_len ? offset : root_len); | |
977 | set_git_dir(cwd->buf, 0); | |
978 | } | |
979 | else | |
980 | set_git_dir(".", 0); | |
981 | return NULL; | |
982 | } | |
983 | ||
984 | static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len) | |
985 | { | |
986 | struct stat buf; | |
987 | if (stat(path, &buf)) { | |
988 | die_errno(_("failed to stat '%*s%s%s'"), | |
989 | prefix_len, | |
990 | prefix ? prefix : "", | |
991 | prefix ? "/" : "", path); | |
992 | } | |
993 | return buf.st_dev; | |
994 | } | |
995 | ||
996 | /* | |
997 | * A "string_list_each_func_t" function that canonicalizes an entry | |
998 | * from GIT_CEILING_DIRECTORIES using real_pathdup(), or | |
999 | * discards it if unusable. The presence of an empty entry in | |
1000 | * GIT_CEILING_DIRECTORIES turns off canonicalization for all | |
1001 | * subsequent entries. | |
1002 | */ | |
1003 | static int canonicalize_ceiling_entry(struct string_list_item *item, | |
1004 | void *cb_data) | |
1005 | { | |
1006 | int *empty_entry_found = cb_data; | |
1007 | char *ceil = item->string; | |
1008 | ||
1009 | if (!*ceil) { | |
1010 | *empty_entry_found = 1; | |
1011 | return 0; | |
1012 | } else if (!is_absolute_path(ceil)) { | |
1013 | return 0; | |
1014 | } else if (*empty_entry_found) { | |
1015 | /* Keep entry but do not canonicalize it */ | |
1016 | return 1; | |
1017 | } else { | |
1018 | char *real_path = real_pathdup(ceil, 0); | |
1019 | if (!real_path) { | |
1020 | return 0; | |
1021 | } | |
1022 | free(item->string); | |
1023 | item->string = real_path; | |
1024 | return 1; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | enum discovery_result { | |
1029 | GIT_DIR_NONE = 0, | |
1030 | GIT_DIR_EXPLICIT, | |
1031 | GIT_DIR_DISCOVERED, | |
1032 | GIT_DIR_BARE, | |
1033 | /* these are errors */ | |
1034 | GIT_DIR_HIT_CEILING = -1, | |
1035 | GIT_DIR_HIT_MOUNT_POINT = -2, | |
1036 | GIT_DIR_INVALID_GITFILE = -3 | |
1037 | }; | |
1038 | ||
1039 | /* | |
1040 | * We cannot decide in this function whether we are in the work tree or | |
1041 | * not, since the config can only be read _after_ this function was called. | |
1042 | * | |
1043 | * Also, we avoid changing any global state (such as the current working | |
1044 | * directory) to allow early callers. | |
1045 | * | |
1046 | * The directory where the search should start needs to be passed in via the | |
1047 | * `dir` parameter; upon return, the `dir` buffer will contain the path of | |
1048 | * the directory where the search ended, and `gitdir` will contain the path of | |
1049 | * the discovered .git/ directory, if any. If `gitdir` is not absolute, it | |
1050 | * is relative to `dir` (i.e. *not* necessarily the cwd). | |
1051 | */ | |
1052 | static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, | |
1053 | struct strbuf *gitdir, | |
1054 | int die_on_error) | |
1055 | { | |
1056 | const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); | |
1057 | struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; | |
1058 | const char *gitdirenv; | |
1059 | int ceil_offset = -1, min_offset = offset_1st_component(dir->buf); | |
1060 | dev_t current_device = 0; | |
1061 | int one_filesystem = 1; | |
1062 | ||
1063 | /* | |
1064 | * If GIT_DIR is set explicitly, we're not going | |
1065 | * to do any discovery, but we still do repository | |
1066 | * validation. | |
1067 | */ | |
1068 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); | |
1069 | if (gitdirenv) { | |
1070 | strbuf_addstr(gitdir, gitdirenv); | |
1071 | return GIT_DIR_EXPLICIT; | |
1072 | } | |
1073 | ||
1074 | if (env_ceiling_dirs) { | |
1075 | int empty_entry_found = 0; | |
1076 | ||
1077 | string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); | |
1078 | filter_string_list(&ceiling_dirs, 0, | |
1079 | canonicalize_ceiling_entry, &empty_entry_found); | |
1080 | ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs); | |
1081 | string_list_clear(&ceiling_dirs, 0); | |
1082 | } | |
1083 | ||
1084 | if (ceil_offset < 0) | |
1085 | ceil_offset = min_offset - 2; | |
1086 | ||
1087 | if (min_offset && min_offset == dir->len && | |
1088 | !is_dir_sep(dir->buf[min_offset - 1])) { | |
1089 | strbuf_addch(dir, '/'); | |
1090 | min_offset++; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Test in the following order (relative to the dir): | |
1095 | * - .git (file containing "gitdir: <path>") | |
1096 | * - .git/ | |
1097 | * - ./ (bare) | |
1098 | * - ../.git | |
1099 | * - ../.git/ | |
1100 | * - ../ (bare) | |
1101 | * - ../../.git | |
1102 | * etc. | |
1103 | */ | |
1104 | one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); | |
1105 | if (one_filesystem) | |
1106 | current_device = get_device_or_die(dir->buf, NULL, 0); | |
1107 | for (;;) { | |
1108 | int offset = dir->len, error_code = 0; | |
1109 | ||
1110 | if (offset > min_offset) | |
1111 | strbuf_addch(dir, '/'); | |
1112 | strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT); | |
1113 | gitdirenv = read_gitfile_gently(dir->buf, die_on_error ? | |
1114 | NULL : &error_code); | |
1115 | if (!gitdirenv) { | |
1116 | if (die_on_error || | |
1117 | error_code == READ_GITFILE_ERR_NOT_A_FILE) { | |
1118 | /* NEEDSWORK: fail if .git is not file nor dir */ | |
1119 | if (is_git_directory(dir->buf)) | |
1120 | gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; | |
1121 | } else if (error_code != READ_GITFILE_ERR_STAT_FAILED) | |
1122 | return GIT_DIR_INVALID_GITFILE; | |
1123 | } | |
1124 | strbuf_setlen(dir, offset); | |
1125 | if (gitdirenv) { | |
1126 | strbuf_addstr(gitdir, gitdirenv); | |
1127 | return GIT_DIR_DISCOVERED; | |
1128 | } | |
1129 | ||
1130 | if (is_git_directory(dir->buf)) { | |
1131 | strbuf_addstr(gitdir, "."); | |
1132 | return GIT_DIR_BARE; | |
1133 | } | |
1134 | ||
1135 | if (offset <= min_offset) | |
1136 | return GIT_DIR_HIT_CEILING; | |
1137 | ||
1138 | while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset])) | |
1139 | ; /* continue */ | |
1140 | if (offset <= ceil_offset) | |
1141 | return GIT_DIR_HIT_CEILING; | |
1142 | ||
1143 | strbuf_setlen(dir, offset > min_offset ? offset : min_offset); | |
1144 | if (one_filesystem && | |
1145 | current_device != get_device_or_die(dir->buf, NULL, offset)) | |
1146 | return GIT_DIR_HIT_MOUNT_POINT; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | int discover_git_directory(struct strbuf *commondir, | |
1151 | struct strbuf *gitdir) | |
1152 | { | |
1153 | struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; | |
1154 | size_t gitdir_offset = gitdir->len, cwd_len; | |
1155 | size_t commondir_offset = commondir->len; | |
1156 | struct repository_format candidate = REPOSITORY_FORMAT_INIT; | |
1157 | ||
1158 | if (strbuf_getcwd(&dir)) | |
1159 | return -1; | |
1160 | ||
1161 | cwd_len = dir.len; | |
1162 | if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) { | |
1163 | strbuf_release(&dir); | |
1164 | return -1; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * The returned gitdir is relative to dir, and if dir does not reflect | |
1169 | * the current working directory, we simply make the gitdir absolute. | |
1170 | */ | |
1171 | if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) { | |
1172 | /* Avoid a trailing "/." */ | |
1173 | if (!strcmp(".", gitdir->buf + gitdir_offset)) | |
1174 | strbuf_setlen(gitdir, gitdir_offset); | |
1175 | else | |
1176 | strbuf_addch(&dir, '/'); | |
1177 | strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len); | |
1178 | } | |
1179 | ||
1180 | get_common_dir(commondir, gitdir->buf + gitdir_offset); | |
1181 | ||
1182 | strbuf_reset(&dir); | |
1183 | strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset); | |
1184 | read_repository_format(&candidate, dir.buf); | |
1185 | strbuf_release(&dir); | |
1186 | ||
1187 | if (verify_repository_format(&candidate, &err) < 0) { | |
1188 | warning("ignoring git dir '%s': %s", | |
1189 | gitdir->buf + gitdir_offset, err.buf); | |
1190 | strbuf_release(&err); | |
1191 | strbuf_setlen(commondir, commondir_offset); | |
1192 | strbuf_setlen(gitdir, gitdir_offset); | |
1193 | clear_repository_format(&candidate); | |
1194 | return -1; | |
1195 | } | |
1196 | ||
1197 | /* take ownership of candidate.partial_clone */ | |
1198 | the_repository->repository_format_partial_clone = | |
1199 | candidate.partial_clone; | |
1200 | candidate.partial_clone = NULL; | |
1201 | ||
1202 | clear_repository_format(&candidate); | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | const char *setup_git_directory_gently(int *nongit_ok) | |
1207 | { | |
1208 | static struct strbuf cwd = STRBUF_INIT; | |
1209 | struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; | |
1210 | const char *prefix = NULL; | |
1211 | struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; | |
1212 | ||
1213 | /* | |
1214 | * We may have read an incomplete configuration before | |
1215 | * setting-up the git directory. If so, clear the cache so | |
1216 | * that the next queries to the configuration reload complete | |
1217 | * configuration (including the per-repo config file that we | |
1218 | * ignored previously). | |
1219 | */ | |
1220 | git_config_clear(); | |
1221 | ||
1222 | /* | |
1223 | * Let's assume that we are in a git repository. | |
1224 | * If it turns out later that we are somewhere else, the value will be | |
1225 | * updated accordingly. | |
1226 | */ | |
1227 | if (nongit_ok) | |
1228 | *nongit_ok = 0; | |
1229 | ||
1230 | if (strbuf_getcwd(&cwd)) | |
1231 | die_errno(_("Unable to read current working directory")); | |
1232 | strbuf_addbuf(&dir, &cwd); | |
1233 | ||
1234 | switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) { | |
1235 | case GIT_DIR_EXPLICIT: | |
1236 | prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok); | |
1237 | break; | |
1238 | case GIT_DIR_DISCOVERED: | |
1239 | if (dir.len < cwd.len && chdir(dir.buf)) | |
1240 | die(_("cannot change to '%s'"), dir.buf); | |
1241 | prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len, | |
1242 | &repo_fmt, nongit_ok); | |
1243 | break; | |
1244 | case GIT_DIR_BARE: | |
1245 | if (dir.len < cwd.len && chdir(dir.buf)) | |
1246 | die(_("cannot change to '%s'"), dir.buf); | |
1247 | prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok); | |
1248 | break; | |
1249 | case GIT_DIR_HIT_CEILING: | |
1250 | if (!nongit_ok) | |
1251 | die(_("not a git repository (or any of the parent directories): %s"), | |
1252 | DEFAULT_GIT_DIR_ENVIRONMENT); | |
1253 | *nongit_ok = 1; | |
1254 | break; | |
1255 | case GIT_DIR_HIT_MOUNT_POINT: | |
1256 | if (!nongit_ok) | |
1257 | die(_("not a git repository (or any parent up to mount point %s)\n" | |
1258 | "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."), | |
1259 | dir.buf); | |
1260 | *nongit_ok = 1; | |
1261 | break; | |
1262 | case GIT_DIR_NONE: | |
1263 | /* | |
1264 | * As a safeguard against setup_git_directory_gently_1 returning | |
1265 | * this value, fallthrough to BUG. Otherwise it is possible to | |
1266 | * set startup_info->have_repository to 1 when we did nothing to | |
1267 | * find a repository. | |
1268 | */ | |
1269 | default: | |
1270 | BUG("unhandled setup_git_directory_1() result"); | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * At this point, nongit_ok is stable. If it is non-NULL and points | |
1275 | * to a non-zero value, then this means that we haven't found a | |
1276 | * repository and that the caller expects startup_info to reflect | |
1277 | * this. | |
1278 | * | |
1279 | * Regardless of the state of nongit_ok, startup_info->prefix and | |
1280 | * the GIT_PREFIX environment variable must always match. For details | |
1281 | * see Documentation/config/alias.txt. | |
1282 | */ | |
1283 | if (nongit_ok && *nongit_ok) | |
1284 | startup_info->have_repository = 0; | |
1285 | else | |
1286 | startup_info->have_repository = 1; | |
1287 | ||
1288 | /* | |
1289 | * Not all paths through the setup code will call 'set_git_dir()' (which | |
1290 | * directly sets up the environment) so in order to guarantee that the | |
1291 | * environment is in a consistent state after setup, explicitly setup | |
1292 | * the environment if we have a repository. | |
1293 | * | |
1294 | * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some | |
1295 | * code paths so we also need to explicitly setup the environment if | |
1296 | * the user has set GIT_DIR. It may be beneficial to disallow bogus | |
1297 | * GIT_DIR values at some point in the future. | |
1298 | */ | |
1299 | if (/* GIT_DIR_EXPLICIT, GIT_DIR_DISCOVERED, GIT_DIR_BARE */ | |
1300 | startup_info->have_repository || | |
1301 | /* GIT_DIR_EXPLICIT */ | |
1302 | getenv(GIT_DIR_ENVIRONMENT)) { | |
1303 | if (!the_repository->gitdir) { | |
1304 | const char *gitdir = getenv(GIT_DIR_ENVIRONMENT); | |
1305 | if (!gitdir) | |
1306 | gitdir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
1307 | setup_git_env(gitdir); | |
1308 | } | |
1309 | if (startup_info->have_repository) { | |
1310 | repo_set_hash_algo(the_repository, repo_fmt.hash_algo); | |
1311 | /* take ownership of repo_fmt.partial_clone */ | |
1312 | the_repository->repository_format_partial_clone = | |
1313 | repo_fmt.partial_clone; | |
1314 | repo_fmt.partial_clone = NULL; | |
1315 | } | |
1316 | } | |
1317 | /* | |
1318 | * Since precompose_string_if_needed() needs to look at | |
1319 | * the core.precomposeunicode configuration, this | |
1320 | * has to happen after the above block that finds | |
1321 | * out where the repository is, i.e. a preparation | |
1322 | * for calling git_config_get_bool(). | |
1323 | */ | |
1324 | if (prefix) { | |
1325 | prefix = precompose_string_if_needed(prefix); | |
1326 | startup_info->prefix = prefix; | |
1327 | setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); | |
1328 | } else { | |
1329 | startup_info->prefix = NULL; | |
1330 | setenv(GIT_PREFIX_ENVIRONMENT, "", 1); | |
1331 | } | |
1332 | ||
1333 | ||
1334 | strbuf_release(&dir); | |
1335 | strbuf_release(&gitdir); | |
1336 | clear_repository_format(&repo_fmt); | |
1337 | ||
1338 | return prefix; | |
1339 | } | |
1340 | ||
1341 | int git_config_perm(const char *var, const char *value) | |
1342 | { | |
1343 | int i; | |
1344 | char *endptr; | |
1345 | ||
1346 | if (value == NULL) | |
1347 | return PERM_GROUP; | |
1348 | ||
1349 | if (!strcmp(value, "umask")) | |
1350 | return PERM_UMASK; | |
1351 | if (!strcmp(value, "group")) | |
1352 | return PERM_GROUP; | |
1353 | if (!strcmp(value, "all") || | |
1354 | !strcmp(value, "world") || | |
1355 | !strcmp(value, "everybody")) | |
1356 | return PERM_EVERYBODY; | |
1357 | ||
1358 | /* Parse octal numbers */ | |
1359 | i = strtol(value, &endptr, 8); | |
1360 | ||
1361 | /* If not an octal number, maybe true/false? */ | |
1362 | if (*endptr != 0) | |
1363 | return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; | |
1364 | ||
1365 | /* | |
1366 | * Treat values 0, 1 and 2 as compatibility cases, otherwise it is | |
1367 | * a chmod value to restrict to. | |
1368 | */ | |
1369 | switch (i) { | |
1370 | case PERM_UMASK: /* 0 */ | |
1371 | return PERM_UMASK; | |
1372 | case OLD_PERM_GROUP: /* 1 */ | |
1373 | return PERM_GROUP; | |
1374 | case OLD_PERM_EVERYBODY: /* 2 */ | |
1375 | return PERM_EVERYBODY; | |
1376 | } | |
1377 | ||
1378 | /* A filemode value was given: 0xxx */ | |
1379 | ||
1380 | if ((i & 0600) != 0600) | |
1381 | die(_("problem with core.sharedRepository filemode value " | |
1382 | "(0%.3o).\nThe owner of files must always have " | |
1383 | "read and write permissions."), i); | |
1384 | ||
1385 | /* | |
1386 | * Mask filemode value. Others can not get write permission. | |
1387 | * x flags for directories are handled separately. | |
1388 | */ | |
1389 | return -(i & 0666); | |
1390 | } | |
1391 | ||
1392 | void check_repository_format(struct repository_format *fmt) | |
1393 | { | |
1394 | struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; | |
1395 | if (!fmt) | |
1396 | fmt = &repo_fmt; | |
1397 | check_repository_format_gently(get_git_dir(), fmt, NULL); | |
1398 | startup_info->have_repository = 1; | |
1399 | repo_set_hash_algo(the_repository, fmt->hash_algo); | |
1400 | the_repository->repository_format_partial_clone = | |
1401 | xstrdup_or_null(fmt->partial_clone); | |
1402 | clear_repository_format(&repo_fmt); | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * Returns the "prefix", a path to the current working directory | |
1407 | * relative to the work tree root, or NULL, if the current working | |
1408 | * directory is not a strict subdirectory of the work tree root. The | |
1409 | * prefix always ends with a '/' character. | |
1410 | */ | |
1411 | const char *setup_git_directory(void) | |
1412 | { | |
1413 | return setup_git_directory_gently(NULL); | |
1414 | } | |
1415 | ||
1416 | const char *resolve_gitdir_gently(const char *suspect, int *return_error_code) | |
1417 | { | |
1418 | if (is_git_directory(suspect)) | |
1419 | return suspect; | |
1420 | return read_gitfile_gently(suspect, return_error_code); | |
1421 | } | |
1422 | ||
1423 | /* if any standard file descriptor is missing open it to /dev/null */ | |
1424 | void sanitize_stdfds(void) | |
1425 | { | |
1426 | int fd = open("/dev/null", O_RDWR, 0); | |
1427 | while (fd != -1 && fd < 2) | |
1428 | fd = dup(fd); | |
1429 | if (fd == -1) | |
1430 | die_errno(_("open /dev/null or dup failed")); | |
1431 | if (fd > 2) | |
1432 | close(fd); | |
1433 | } | |
1434 | ||
1435 | int daemonize(void) | |
1436 | { | |
1437 | #ifdef NO_POSIX_GOODIES | |
1438 | errno = ENOSYS; | |
1439 | return -1; | |
1440 | #else | |
1441 | switch (fork()) { | |
1442 | case 0: | |
1443 | break; | |
1444 | case -1: | |
1445 | die_errno(_("fork failed")); | |
1446 | default: | |
1447 | exit(0); | |
1448 | } | |
1449 | if (setsid() == -1) | |
1450 | die_errno(_("setsid failed")); | |
1451 | close(0); | |
1452 | close(1); | |
1453 | close(2); | |
1454 | sanitize_stdfds(); | |
1455 | return 0; | |
1456 | #endif | |
1457 | } |