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1 | #include "cache.h" | |
2 | #include "dir.h" | |
3 | ||
4 | static int inside_git_dir = -1; | |
5 | static int inside_work_tree = -1; | |
6 | ||
7 | char *prefix_path(const char *prefix, int len, const char *path) | |
8 | { | |
9 | const char *orig = path; | |
10 | char *sanitized; | |
11 | if (is_absolute_path(orig)) { | |
12 | const char *temp = real_path(path); | |
13 | sanitized = xmalloc(len + strlen(temp) + 1); | |
14 | strcpy(sanitized, temp); | |
15 | } else { | |
16 | sanitized = xmalloc(len + strlen(path) + 1); | |
17 | if (len) | |
18 | memcpy(sanitized, prefix, len); | |
19 | strcpy(sanitized + len, path); | |
20 | } | |
21 | if (normalize_path_copy(sanitized, sanitized)) | |
22 | goto error_out; | |
23 | if (is_absolute_path(orig)) { | |
24 | size_t root_len, len, total; | |
25 | const char *work_tree = get_git_work_tree(); | |
26 | if (!work_tree) | |
27 | goto error_out; | |
28 | len = strlen(work_tree); | |
29 | root_len = offset_1st_component(work_tree); | |
30 | total = strlen(sanitized) + 1; | |
31 | if (strncmp(sanitized, work_tree, len) || | |
32 | (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) { | |
33 | error_out: | |
34 | die("'%s' is outside repository", orig); | |
35 | } | |
36 | if (sanitized[len] == '/') | |
37 | len++; | |
38 | memmove(sanitized, sanitized + len, total - len); | |
39 | } | |
40 | return sanitized; | |
41 | } | |
42 | ||
43 | /* | |
44 | * Unlike prefix_path, this should be used if the named file does | |
45 | * not have to interact with index entry; i.e. name of a random file | |
46 | * on the filesystem. | |
47 | */ | |
48 | const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) | |
49 | { | |
50 | static char path[PATH_MAX]; | |
51 | #ifndef WIN32 | |
52 | if (!pfx_len || is_absolute_path(arg)) | |
53 | return arg; | |
54 | memcpy(path, pfx, pfx_len); | |
55 | strcpy(path + pfx_len, arg); | |
56 | #else | |
57 | char *p; | |
58 | /* don't add prefix to absolute paths, but still replace '\' by '/' */ | |
59 | if (is_absolute_path(arg)) | |
60 | pfx_len = 0; | |
61 | else if (pfx_len) | |
62 | memcpy(path, pfx, pfx_len); | |
63 | strcpy(path + pfx_len, arg); | |
64 | for (p = path + pfx_len; *p; p++) | |
65 | if (*p == '\\') | |
66 | *p = '/'; | |
67 | #endif | |
68 | return path; | |
69 | } | |
70 | ||
71 | int check_filename(const char *prefix, const char *arg) | |
72 | { | |
73 | const char *name; | |
74 | struct stat st; | |
75 | ||
76 | name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; | |
77 | if (!lstat(name, &st)) | |
78 | return 1; /* file exists */ | |
79 | if (errno == ENOENT || errno == ENOTDIR) | |
80 | return 0; /* file does not exist */ | |
81 | die_errno("failed to stat '%s'", arg); | |
82 | } | |
83 | ||
84 | static void NORETURN die_verify_filename(const char *prefix, const char *arg) | |
85 | { | |
86 | unsigned char sha1[20]; | |
87 | unsigned mode; | |
88 | ||
89 | /* | |
90 | * Saying "'(icase)foo' does not exist in the index" when the | |
91 | * user gave us ":(icase)foo" is just stupid. A magic pathspec | |
92 | * begins with a colon and is followed by a non-alnum; do not | |
93 | * let get_sha1_with_mode_1(only_to_die=1) to even trigger. | |
94 | */ | |
95 | if (!(arg[0] == ':' && !isalnum(arg[1]))) | |
96 | /* try a detailed diagnostic ... */ | |
97 | get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix); | |
98 | ||
99 | /* ... or fall back the most general message. */ | |
100 | die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" | |
101 | "Use '--' to separate paths from revisions", arg); | |
102 | ||
103 | } | |
104 | ||
105 | /* | |
106 | * Verify a filename that we got as an argument for a pathspec | |
107 | * entry. Note that a filename that begins with "-" never verifies | |
108 | * as true, because even if such a filename were to exist, we want | |
109 | * it to be preceded by the "--" marker (or we want the user to | |
110 | * use a format like "./-filename") | |
111 | */ | |
112 | void verify_filename(const char *prefix, const char *arg) | |
113 | { | |
114 | if (*arg == '-') | |
115 | die("bad flag '%s' used after filename", arg); | |
116 | if (check_filename(prefix, arg)) | |
117 | return; | |
118 | die_verify_filename(prefix, arg); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Opposite of the above: the command line did not have -- marker | |
123 | * and we parsed the arg as a refname. It should not be interpretable | |
124 | * as a filename. | |
125 | */ | |
126 | void verify_non_filename(const char *prefix, const char *arg) | |
127 | { | |
128 | if (!is_inside_work_tree() || is_inside_git_dir()) | |
129 | return; | |
130 | if (*arg == '-') | |
131 | return; /* flag */ | |
132 | if (!check_filename(prefix, arg)) | |
133 | return; | |
134 | die("ambiguous argument '%s': both revision and filename\n" | |
135 | "Use '--' to separate filenames from revisions", arg); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Magic pathspec | |
140 | * | |
141 | * NEEDSWORK: These need to be moved to dir.h or even to a new | |
142 | * pathspec.h when we restructure get_pathspec() users to use the | |
143 | * "struct pathspec" interface. | |
144 | * | |
145 | * Possible future magic semantics include stuff like: | |
146 | * | |
147 | * { PATHSPEC_NOGLOB, '!', "noglob" }, | |
148 | * { PATHSPEC_ICASE, '\0', "icase" }, | |
149 | * { PATHSPEC_RECURSIVE, '*', "recursive" }, | |
150 | * { PATHSPEC_REGEXP, '\0', "regexp" }, | |
151 | * | |
152 | */ | |
153 | #define PATHSPEC_FROMTOP (1<<0) | |
154 | ||
155 | static struct pathspec_magic { | |
156 | unsigned bit; | |
157 | char mnemonic; /* this cannot be ':'! */ | |
158 | const char *name; | |
159 | } pathspec_magic[] = { | |
160 | { PATHSPEC_FROMTOP, '/', "top" }, | |
161 | }; | |
162 | ||
163 | /* | |
164 | * Take an element of a pathspec and check for magic signatures. | |
165 | * Append the result to the prefix. | |
166 | * | |
167 | * For now, we only parse the syntax and throw out anything other than | |
168 | * "top" magic. | |
169 | * | |
170 | * NEEDSWORK: This needs to be rewritten when we start migrating | |
171 | * get_pathspec() users to use the "struct pathspec" interface. For | |
172 | * example, a pathspec element may be marked as case-insensitive, but | |
173 | * the prefix part must always match literally, and a single stupid | |
174 | * string cannot express such a case. | |
175 | */ | |
176 | static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt) | |
177 | { | |
178 | unsigned magic = 0; | |
179 | const char *copyfrom = elt; | |
180 | int i; | |
181 | ||
182 | if (elt[0] != ':') { | |
183 | ; /* nothing to do */ | |
184 | } else if (elt[1] == '(') { | |
185 | /* longhand */ | |
186 | const char *nextat; | |
187 | for (copyfrom = elt + 2; | |
188 | *copyfrom && *copyfrom != ')'; | |
189 | copyfrom = nextat) { | |
190 | size_t len = strcspn(copyfrom, ",)"); | |
191 | if (copyfrom[len] == ')') | |
192 | nextat = copyfrom + len; | |
193 | else | |
194 | nextat = copyfrom + len + 1; | |
195 | if (!len) | |
196 | continue; | |
197 | for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) | |
198 | if (strlen(pathspec_magic[i].name) == len && | |
199 | !strncmp(pathspec_magic[i].name, copyfrom, len)) { | |
200 | magic |= pathspec_magic[i].bit; | |
201 | break; | |
202 | } | |
203 | if (ARRAY_SIZE(pathspec_magic) <= i) | |
204 | die("Invalid pathspec magic '%.*s' in '%s'", | |
205 | (int) len, copyfrom, elt); | |
206 | } | |
207 | if (*copyfrom == ')') | |
208 | copyfrom++; | |
209 | } else { | |
210 | /* shorthand */ | |
211 | for (copyfrom = elt + 1; | |
212 | *copyfrom && *copyfrom != ':'; | |
213 | copyfrom++) { | |
214 | char ch = *copyfrom; | |
215 | ||
216 | if (!is_pathspec_magic(ch)) | |
217 | break; | |
218 | for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) | |
219 | if (pathspec_magic[i].mnemonic == ch) { | |
220 | magic |= pathspec_magic[i].bit; | |
221 | break; | |
222 | } | |
223 | if (ARRAY_SIZE(pathspec_magic) <= i) | |
224 | die("Unimplemented pathspec magic '%c' in '%s'", | |
225 | ch, elt); | |
226 | } | |
227 | if (*copyfrom == ':') | |
228 | copyfrom++; | |
229 | } | |
230 | ||
231 | if (magic & PATHSPEC_FROMTOP) | |
232 | return xstrdup(copyfrom); | |
233 | else | |
234 | return prefix_path(prefix, prefixlen, copyfrom); | |
235 | } | |
236 | ||
237 | const char **get_pathspec(const char *prefix, const char **pathspec) | |
238 | { | |
239 | const char *entry = *pathspec; | |
240 | const char **src, **dst; | |
241 | int prefixlen; | |
242 | ||
243 | if (!prefix && !entry) | |
244 | return NULL; | |
245 | ||
246 | if (!entry) { | |
247 | static const char *spec[2]; | |
248 | spec[0] = prefix; | |
249 | spec[1] = NULL; | |
250 | return spec; | |
251 | } | |
252 | ||
253 | /* Otherwise we have to re-write the entries.. */ | |
254 | src = pathspec; | |
255 | dst = pathspec; | |
256 | prefixlen = prefix ? strlen(prefix) : 0; | |
257 | while (*src) { | |
258 | *(dst++) = prefix_pathspec(prefix, prefixlen, *src); | |
259 | src++; | |
260 | } | |
261 | *dst = NULL; | |
262 | if (!*pathspec) | |
263 | return NULL; | |
264 | return pathspec; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Test if it looks like we're at a git directory. | |
269 | * We want to see: | |
270 | * | |
271 | * - either an objects/ directory _or_ the proper | |
272 | * GIT_OBJECT_DIRECTORY environment variable | |
273 | * - a refs/ directory | |
274 | * - either a HEAD symlink or a HEAD file that is formatted as | |
275 | * a proper "ref:", or a regular file HEAD that has a properly | |
276 | * formatted sha1 object name. | |
277 | */ | |
278 | static int is_git_directory(const char *suspect) | |
279 | { | |
280 | char path[PATH_MAX]; | |
281 | size_t len = strlen(suspect); | |
282 | ||
283 | if (PATH_MAX <= len + strlen("/objects")) | |
284 | die("Too long path: %.*s", 60, suspect); | |
285 | strcpy(path, suspect); | |
286 | if (getenv(DB_ENVIRONMENT)) { | |
287 | if (access(getenv(DB_ENVIRONMENT), X_OK)) | |
288 | return 0; | |
289 | } | |
290 | else { | |
291 | strcpy(path + len, "/objects"); | |
292 | if (access(path, X_OK)) | |
293 | return 0; | |
294 | } | |
295 | ||
296 | strcpy(path + len, "/refs"); | |
297 | if (access(path, X_OK)) | |
298 | return 0; | |
299 | ||
300 | strcpy(path + len, "/HEAD"); | |
301 | if (validate_headref(path)) | |
302 | return 0; | |
303 | ||
304 | return 1; | |
305 | } | |
306 | ||
307 | int is_inside_git_dir(void) | |
308 | { | |
309 | if (inside_git_dir < 0) | |
310 | inside_git_dir = is_inside_dir(get_git_dir()); | |
311 | return inside_git_dir; | |
312 | } | |
313 | ||
314 | int is_inside_work_tree(void) | |
315 | { | |
316 | if (inside_work_tree < 0) | |
317 | inside_work_tree = is_inside_dir(get_git_work_tree()); | |
318 | return inside_work_tree; | |
319 | } | |
320 | ||
321 | void setup_work_tree(void) | |
322 | { | |
323 | const char *work_tree, *git_dir; | |
324 | static int initialized = 0; | |
325 | ||
326 | if (initialized) | |
327 | return; | |
328 | work_tree = get_git_work_tree(); | |
329 | git_dir = get_git_dir(); | |
330 | if (!is_absolute_path(git_dir)) | |
331 | git_dir = real_path(get_git_dir()); | |
332 | if (!work_tree || chdir(work_tree)) | |
333 | die("This operation must be run in a work tree"); | |
334 | ||
335 | /* | |
336 | * Make sure subsequent git processes find correct worktree | |
337 | * if $GIT_WORK_TREE is set relative | |
338 | */ | |
339 | if (getenv(GIT_WORK_TREE_ENVIRONMENT)) | |
340 | setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); | |
341 | ||
342 | set_git_dir(relative_path(git_dir, work_tree)); | |
343 | initialized = 1; | |
344 | } | |
345 | ||
346 | static int check_repository_format_gently(const char *gitdir, int *nongit_ok) | |
347 | { | |
348 | char repo_config[PATH_MAX+1]; | |
349 | ||
350 | /* | |
351 | * git_config() can't be used here because it calls git_pathdup() | |
352 | * to get $GIT_CONFIG/config. That call will make setup_git_env() | |
353 | * set git_dir to ".git". | |
354 | * | |
355 | * We are in gitdir setup, no git dir has been found useable yet. | |
356 | * Use a gentler version of git_config() to check if this repo | |
357 | * is a good one. | |
358 | */ | |
359 | snprintf(repo_config, PATH_MAX, "%s/config", gitdir); | |
360 | git_config_early(check_repository_format_version, NULL, repo_config); | |
361 | if (GIT_REPO_VERSION < repository_format_version) { | |
362 | if (!nongit_ok) | |
363 | die ("Expected git repo version <= %d, found %d", | |
364 | GIT_REPO_VERSION, repository_format_version); | |
365 | warning("Expected git repo version <= %d, found %d", | |
366 | GIT_REPO_VERSION, repository_format_version); | |
367 | warning("Please upgrade Git"); | |
368 | *nongit_ok = -1; | |
369 | return -1; | |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Try to read the location of the git directory from the .git file, | |
376 | * return path to git directory if found. | |
377 | */ | |
378 | const char *read_gitfile_gently(const char *path) | |
379 | { | |
380 | char *buf; | |
381 | char *dir; | |
382 | const char *slash; | |
383 | struct stat st; | |
384 | int fd; | |
385 | ssize_t len; | |
386 | ||
387 | if (stat(path, &st)) | |
388 | return NULL; | |
389 | if (!S_ISREG(st.st_mode)) | |
390 | return NULL; | |
391 | fd = open(path, O_RDONLY); | |
392 | if (fd < 0) | |
393 | die_errno("Error opening '%s'", path); | |
394 | buf = xmalloc(st.st_size + 1); | |
395 | len = read_in_full(fd, buf, st.st_size); | |
396 | close(fd); | |
397 | if (len != st.st_size) | |
398 | die("Error reading %s", path); | |
399 | buf[len] = '\0'; | |
400 | if (prefixcmp(buf, "gitdir: ")) | |
401 | die("Invalid gitfile format: %s", path); | |
402 | while (buf[len - 1] == '\n' || buf[len - 1] == '\r') | |
403 | len--; | |
404 | if (len < 9) | |
405 | die("No path in gitfile: %s", path); | |
406 | buf[len] = '\0'; | |
407 | dir = buf + 8; | |
408 | ||
409 | if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { | |
410 | size_t pathlen = slash+1 - path; | |
411 | size_t dirlen = pathlen + len - 8; | |
412 | dir = xmalloc(dirlen + 1); | |
413 | strncpy(dir, path, pathlen); | |
414 | strncpy(dir + pathlen, buf + 8, len - 8); | |
415 | dir[dirlen] = '\0'; | |
416 | free(buf); | |
417 | buf = dir; | |
418 | } | |
419 | ||
420 | if (!is_git_directory(dir)) | |
421 | die("Not a git repository: %s", dir); | |
422 | path = real_path(dir); | |
423 | ||
424 | free(buf); | |
425 | return path; | |
426 | } | |
427 | ||
428 | static const char *setup_explicit_git_dir(const char *gitdirenv, | |
429 | char *cwd, int len, | |
430 | int *nongit_ok) | |
431 | { | |
432 | const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); | |
433 | const char *worktree; | |
434 | char *gitfile; | |
435 | int offset; | |
436 | ||
437 | if (PATH_MAX - 40 < strlen(gitdirenv)) | |
438 | die("'$%s' too big", GIT_DIR_ENVIRONMENT); | |
439 | ||
440 | gitfile = (char*)read_gitfile_gently(gitdirenv); | |
441 | if (gitfile) { | |
442 | gitfile = xstrdup(gitfile); | |
443 | gitdirenv = gitfile; | |
444 | } | |
445 | ||
446 | if (!is_git_directory(gitdirenv)) { | |
447 | if (nongit_ok) { | |
448 | *nongit_ok = 1; | |
449 | free(gitfile); | |
450 | return NULL; | |
451 | } | |
452 | die("Not a git repository: '%s'", gitdirenv); | |
453 | } | |
454 | ||
455 | if (check_repository_format_gently(gitdirenv, nongit_ok)) { | |
456 | free(gitfile); | |
457 | return NULL; | |
458 | } | |
459 | ||
460 | /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ | |
461 | if (work_tree_env) | |
462 | set_git_work_tree(work_tree_env); | |
463 | else if (is_bare_repository_cfg > 0) { | |
464 | if (git_work_tree_cfg) /* #22.2, #30 */ | |
465 | die("core.bare and core.worktree do not make sense"); | |
466 | ||
467 | /* #18, #26 */ | |
468 | set_git_dir(gitdirenv); | |
469 | free(gitfile); | |
470 | return NULL; | |
471 | } | |
472 | else if (git_work_tree_cfg) { /* #6, #14 */ | |
473 | if (is_absolute_path(git_work_tree_cfg)) | |
474 | set_git_work_tree(git_work_tree_cfg); | |
475 | else { | |
476 | char core_worktree[PATH_MAX]; | |
477 | if (chdir(gitdirenv)) | |
478 | die_errno("Could not chdir to '%s'", gitdirenv); | |
479 | if (chdir(git_work_tree_cfg)) | |
480 | die_errno("Could not chdir to '%s'", git_work_tree_cfg); | |
481 | if (!getcwd(core_worktree, PATH_MAX)) | |
482 | die_errno("Could not get directory '%s'", git_work_tree_cfg); | |
483 | if (chdir(cwd)) | |
484 | die_errno("Could not come back to cwd"); | |
485 | set_git_work_tree(core_worktree); | |
486 | } | |
487 | } | |
488 | else /* #2, #10 */ | |
489 | set_git_work_tree("."); | |
490 | ||
491 | /* set_git_work_tree() must have been called by now */ | |
492 | worktree = get_git_work_tree(); | |
493 | ||
494 | /* both get_git_work_tree() and cwd are already normalized */ | |
495 | if (!strcmp(cwd, worktree)) { /* cwd == worktree */ | |
496 | set_git_dir(gitdirenv); | |
497 | free(gitfile); | |
498 | return NULL; | |
499 | } | |
500 | ||
501 | offset = dir_inside_of(cwd, worktree); | |
502 | if (offset >= 0) { /* cwd inside worktree? */ | |
503 | set_git_dir(real_path(gitdirenv)); | |
504 | if (chdir(worktree)) | |
505 | die_errno("Could not chdir to '%s'", worktree); | |
506 | cwd[len++] = '/'; | |
507 | cwd[len] = '\0'; | |
508 | free(gitfile); | |
509 | return cwd + offset; | |
510 | } | |
511 | ||
512 | /* cwd outside worktree */ | |
513 | set_git_dir(gitdirenv); | |
514 | free(gitfile); | |
515 | return NULL; | |
516 | } | |
517 | ||
518 | static const char *setup_discovered_git_dir(const char *gitdir, | |
519 | char *cwd, int offset, int len, | |
520 | int *nongit_ok) | |
521 | { | |
522 | if (check_repository_format_gently(gitdir, nongit_ok)) | |
523 | return NULL; | |
524 | ||
525 | /* --work-tree is set without --git-dir; use discovered one */ | |
526 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
527 | if (offset != len && !is_absolute_path(gitdir)) | |
528 | gitdir = xstrdup(real_path(gitdir)); | |
529 | if (chdir(cwd)) | |
530 | die_errno("Could not come back to cwd"); | |
531 | return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok); | |
532 | } | |
533 | ||
534 | /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ | |
535 | if (is_bare_repository_cfg > 0) { | |
536 | set_git_dir(offset == len ? gitdir : real_path(gitdir)); | |
537 | if (chdir(cwd)) | |
538 | die_errno("Could not come back to cwd"); | |
539 | return NULL; | |
540 | } | |
541 | ||
542 | /* #0, #1, #5, #8, #9, #12, #13 */ | |
543 | set_git_work_tree("."); | |
544 | if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) | |
545 | set_git_dir(gitdir); | |
546 | inside_git_dir = 0; | |
547 | inside_work_tree = 1; | |
548 | if (offset == len) | |
549 | return NULL; | |
550 | ||
551 | /* Make "offset" point to past the '/', and add a '/' at the end */ | |
552 | offset++; | |
553 | cwd[len++] = '/'; | |
554 | cwd[len] = 0; | |
555 | return cwd + offset; | |
556 | } | |
557 | ||
558 | /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ | |
559 | static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok) | |
560 | { | |
561 | int root_len; | |
562 | ||
563 | if (check_repository_format_gently(".", nongit_ok)) | |
564 | return NULL; | |
565 | ||
566 | /* --work-tree is set without --git-dir; use discovered one */ | |
567 | if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { | |
568 | const char *gitdir; | |
569 | ||
570 | gitdir = offset == len ? "." : xmemdupz(cwd, offset); | |
571 | if (chdir(cwd)) | |
572 | die_errno("Could not come back to cwd"); | |
573 | return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok); | |
574 | } | |
575 | ||
576 | inside_git_dir = 1; | |
577 | inside_work_tree = 0; | |
578 | if (offset != len) { | |
579 | if (chdir(cwd)) | |
580 | die_errno("Cannot come back to cwd"); | |
581 | root_len = offset_1st_component(cwd); | |
582 | cwd[offset > root_len ? offset : root_len] = '\0'; | |
583 | set_git_dir(cwd); | |
584 | } | |
585 | else | |
586 | set_git_dir("."); | |
587 | return NULL; | |
588 | } | |
589 | ||
590 | static const char *setup_nongit(const char *cwd, int *nongit_ok) | |
591 | { | |
592 | if (!nongit_ok) | |
593 | die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT); | |
594 | if (chdir(cwd)) | |
595 | die_errno("Cannot come back to cwd"); | |
596 | *nongit_ok = 1; | |
597 | return NULL; | |
598 | } | |
599 | ||
600 | static dev_t get_device_or_die(const char *path, const char *prefix) | |
601 | { | |
602 | struct stat buf; | |
603 | if (stat(path, &buf)) | |
604 | die_errno("failed to stat '%s%s%s'", | |
605 | prefix ? prefix : "", | |
606 | prefix ? "/" : "", path); | |
607 | return buf.st_dev; | |
608 | } | |
609 | ||
610 | /* | |
611 | * We cannot decide in this function whether we are in the work tree or | |
612 | * not, since the config can only be read _after_ this function was called. | |
613 | */ | |
614 | static const char *setup_git_directory_gently_1(int *nongit_ok) | |
615 | { | |
616 | const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); | |
617 | static char cwd[PATH_MAX+1]; | |
618 | const char *gitdirenv, *ret; | |
619 | char *gitfile; | |
620 | int len, offset, ceil_offset; | |
621 | dev_t current_device = 0; | |
622 | int one_filesystem = 1; | |
623 | ||
624 | /* | |
625 | * Let's assume that we are in a git repository. | |
626 | * If it turns out later that we are somewhere else, the value will be | |
627 | * updated accordingly. | |
628 | */ | |
629 | if (nongit_ok) | |
630 | *nongit_ok = 0; | |
631 | ||
632 | if (!getcwd(cwd, sizeof(cwd)-1)) | |
633 | die_errno("Unable to read current working directory"); | |
634 | offset = len = strlen(cwd); | |
635 | ||
636 | /* | |
637 | * If GIT_DIR is set explicitly, we're not going | |
638 | * to do any discovery, but we still do repository | |
639 | * validation. | |
640 | */ | |
641 | gitdirenv = getenv(GIT_DIR_ENVIRONMENT); | |
642 | if (gitdirenv) | |
643 | return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok); | |
644 | ||
645 | ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs); | |
646 | if (ceil_offset < 0 && has_dos_drive_prefix(cwd)) | |
647 | ceil_offset = 1; | |
648 | ||
649 | /* | |
650 | * Test in the following order (relative to the cwd): | |
651 | * - .git (file containing "gitdir: <path>") | |
652 | * - .git/ | |
653 | * - ./ (bare) | |
654 | * - ../.git | |
655 | * - ../.git/ | |
656 | * - ../ (bare) | |
657 | * - ../../.git/ | |
658 | * etc. | |
659 | */ | |
660 | one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); | |
661 | if (one_filesystem) | |
662 | current_device = get_device_or_die(".", NULL); | |
663 | for (;;) { | |
664 | gitfile = (char*)read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT); | |
665 | if (gitfile) | |
666 | gitdirenv = gitfile = xstrdup(gitfile); | |
667 | else { | |
668 | if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) | |
669 | gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; | |
670 | } | |
671 | ||
672 | if (gitdirenv) { | |
673 | ret = setup_discovered_git_dir(gitdirenv, | |
674 | cwd, offset, len, | |
675 | nongit_ok); | |
676 | free(gitfile); | |
677 | return ret; | |
678 | } | |
679 | free(gitfile); | |
680 | ||
681 | if (is_git_directory(".")) | |
682 | return setup_bare_git_dir(cwd, offset, len, nongit_ok); | |
683 | ||
684 | while (--offset > ceil_offset && cwd[offset] != '/'); | |
685 | if (offset <= ceil_offset) | |
686 | return setup_nongit(cwd, nongit_ok); | |
687 | if (one_filesystem) { | |
688 | dev_t parent_device = get_device_or_die("..", cwd); | |
689 | if (parent_device != current_device) { | |
690 | if (nongit_ok) { | |
691 | if (chdir(cwd)) | |
692 | die_errno("Cannot come back to cwd"); | |
693 | *nongit_ok = 1; | |
694 | return NULL; | |
695 | } | |
696 | cwd[offset] = '\0'; | |
697 | die("Not a git repository (or any parent up to mount parent %s)\n" | |
698 | "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd); | |
699 | } | |
700 | } | |
701 | if (chdir("..")) { | |
702 | cwd[offset] = '\0'; | |
703 | die_errno("Cannot change to '%s/..'", cwd); | |
704 | } | |
705 | } | |
706 | } | |
707 | ||
708 | const char *setup_git_directory_gently(int *nongit_ok) | |
709 | { | |
710 | const char *prefix; | |
711 | ||
712 | prefix = setup_git_directory_gently_1(nongit_ok); | |
713 | if (startup_info) { | |
714 | startup_info->have_repository = !nongit_ok || !*nongit_ok; | |
715 | startup_info->prefix = prefix; | |
716 | } | |
717 | return prefix; | |
718 | } | |
719 | ||
720 | int git_config_perm(const char *var, const char *value) | |
721 | { | |
722 | int i; | |
723 | char *endptr; | |
724 | ||
725 | if (value == NULL) | |
726 | return PERM_GROUP; | |
727 | ||
728 | if (!strcmp(value, "umask")) | |
729 | return PERM_UMASK; | |
730 | if (!strcmp(value, "group")) | |
731 | return PERM_GROUP; | |
732 | if (!strcmp(value, "all") || | |
733 | !strcmp(value, "world") || | |
734 | !strcmp(value, "everybody")) | |
735 | return PERM_EVERYBODY; | |
736 | ||
737 | /* Parse octal numbers */ | |
738 | i = strtol(value, &endptr, 8); | |
739 | ||
740 | /* If not an octal number, maybe true/false? */ | |
741 | if (*endptr != 0) | |
742 | return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; | |
743 | ||
744 | /* | |
745 | * Treat values 0, 1 and 2 as compatibility cases, otherwise it is | |
746 | * a chmod value to restrict to. | |
747 | */ | |
748 | switch (i) { | |
749 | case PERM_UMASK: /* 0 */ | |
750 | return PERM_UMASK; | |
751 | case OLD_PERM_GROUP: /* 1 */ | |
752 | return PERM_GROUP; | |
753 | case OLD_PERM_EVERYBODY: /* 2 */ | |
754 | return PERM_EVERYBODY; | |
755 | } | |
756 | ||
757 | /* A filemode value was given: 0xxx */ | |
758 | ||
759 | if ((i & 0600) != 0600) | |
760 | die("Problem with core.sharedRepository filemode value " | |
761 | "(0%.3o).\nThe owner of files must always have " | |
762 | "read and write permissions.", i); | |
763 | ||
764 | /* | |
765 | * Mask filemode value. Others can not get write permission. | |
766 | * x flags for directories are handled separately. | |
767 | */ | |
768 | return -(i & 0666); | |
769 | } | |
770 | ||
771 | int check_repository_format_version(const char *var, const char *value, void *cb) | |
772 | { | |
773 | if (strcmp(var, "core.repositoryformatversion") == 0) | |
774 | repository_format_version = git_config_int(var, value); | |
775 | else if (strcmp(var, "core.sharedrepository") == 0) | |
776 | shared_repository = git_config_perm(var, value); | |
777 | else if (strcmp(var, "core.bare") == 0) { | |
778 | is_bare_repository_cfg = git_config_bool(var, value); | |
779 | if (is_bare_repository_cfg == 1) | |
780 | inside_work_tree = -1; | |
781 | } else if (strcmp(var, "core.worktree") == 0) { | |
782 | if (!value) | |
783 | return config_error_nonbool(var); | |
784 | free(git_work_tree_cfg); | |
785 | git_work_tree_cfg = xstrdup(value); | |
786 | inside_work_tree = -1; | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
791 | int check_repository_format(void) | |
792 | { | |
793 | return check_repository_format_gently(get_git_dir(), NULL); | |
794 | } | |
795 | ||
796 | /* | |
797 | * Returns the "prefix", a path to the current working directory | |
798 | * relative to the work tree root, or NULL, if the current working | |
799 | * directory is not a strict subdirectory of the work tree root. The | |
800 | * prefix always ends with a '/' character. | |
801 | */ | |
802 | const char *setup_git_directory(void) | |
803 | { | |
804 | return setup_git_directory_gently(NULL); | |
805 | } |