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