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Commit | Line | Data |
---|---|---|
26c8a533 | 1 | /* |
3a429d3b | 2 | * Utilities for paths and pathnames |
26c8a533 LT |
3 | */ |
4 | #include "cache.h" | |
395de250 | 5 | #include "strbuf.h" |
a5ccdbe4 | 6 | #include "string-list.h" |
26c8a533 | 7 | |
f66450ae | 8 | static int get_st_mode_bits(const char *path, int *mode) |
0117c2f0 TB |
9 | { |
10 | struct stat st; | |
11 | if (lstat(path, &st) < 0) | |
12 | return -1; | |
13 | *mode = st.st_mode; | |
14 | return 0; | |
15 | } | |
0117c2f0 | 16 | |
26c8a533 LT |
17 | static char bad_path[] = "/bad-path/"; |
18 | ||
4ef9caf5 | 19 | static struct strbuf *get_pathname(void) |
e7676d2f | 20 | { |
4ef9caf5 NTND |
21 | static struct strbuf pathname_array[4] = { |
22 | STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT | |
23 | }; | |
e7676d2f | 24 | static int index; |
4ef9caf5 NTND |
25 | struct strbuf *sb = &pathname_array[3 & ++index]; |
26 | strbuf_reset(sb); | |
27 | return sb; | |
e7676d2f LT |
28 | } |
29 | ||
26c8a533 LT |
30 | static char *cleanup_path(char *path) |
31 | { | |
32 | /* Clean it up */ | |
33 | if (!memcmp(path, "./", 2)) { | |
34 | path += 2; | |
35 | while (*path == '/') | |
36 | path++; | |
37 | } | |
38 | return path; | |
39 | } | |
40 | ||
4ef9caf5 NTND |
41 | static void strbuf_cleanup_path(struct strbuf *sb) |
42 | { | |
43 | char *path = cleanup_path(sb->buf); | |
44 | if (path > sb->buf) | |
45 | strbuf_remove(sb, 0, path - sb->buf); | |
46 | } | |
47 | ||
108bebea AR |
48 | char *mksnpath(char *buf, size_t n, const char *fmt, ...) |
49 | { | |
50 | va_list args; | |
51 | unsigned len; | |
52 | ||
53 | va_start(args, fmt); | |
54 | len = vsnprintf(buf, n, fmt, args); | |
55 | va_end(args); | |
56 | if (len >= n) { | |
9db56f71 | 57 | strlcpy(buf, bad_path, n); |
108bebea AR |
58 | return buf; |
59 | } | |
60 | return cleanup_path(buf); | |
61 | } | |
62 | ||
557bd833 NTND |
63 | static int dir_prefix(const char *buf, const char *dir) |
64 | { | |
65 | int len = strlen(dir); | |
66 | return !strncmp(buf, dir, len) && | |
67 | (is_dir_sep(buf[len]) || buf[len] == '\0'); | |
68 | } | |
69 | ||
70 | /* $buf =~ m|$dir/+$file| but without regex */ | |
71 | static int is_dir_file(const char *buf, const char *dir, const char *file) | |
72 | { | |
73 | int len = strlen(dir); | |
74 | if (strncmp(buf, dir, len) || !is_dir_sep(buf[len])) | |
75 | return 0; | |
76 | while (is_dir_sep(buf[len])) | |
77 | len++; | |
78 | return !strcmp(buf + len, file); | |
79 | } | |
80 | ||
81 | static void replace_dir(struct strbuf *buf, int len, const char *newdir) | |
82 | { | |
83 | int newlen = strlen(newdir); | |
84 | int need_sep = (buf->buf[len] && !is_dir_sep(buf->buf[len])) && | |
85 | !is_dir_sep(newdir[newlen - 1]); | |
86 | if (need_sep) | |
87 | len--; /* keep one char, to be replaced with '/' */ | |
88 | strbuf_splice(buf, 0, len, newdir, newlen); | |
89 | if (need_sep) | |
90 | buf->buf[newlen] = '/'; | |
91 | } | |
92 | ||
c7b3a3d2 NTND |
93 | static const char *common_list[] = { |
94 | "/branches", "/hooks", "/info", "/logs", "/lost-found", "/modules", | |
529fef20 | 95 | "/objects", "/refs", "/remotes", "/worktrees", "/rr-cache", "/svn", |
c7b3a3d2 NTND |
96 | "config", "gc.pid", "packed-refs", "shallow", |
97 | NULL | |
98 | }; | |
99 | ||
100 | static void update_common_dir(struct strbuf *buf, int git_dir_len) | |
101 | { | |
102 | char *base = buf->buf + git_dir_len; | |
103 | const char **p; | |
104 | ||
105 | if (is_dir_file(base, "logs", "HEAD")) | |
106 | return; /* keep this in $GIT_DIR */ | |
107 | for (p = common_list; *p; p++) { | |
108 | const char *path = *p; | |
109 | int is_dir = 0; | |
110 | if (*path == '/') { | |
111 | path++; | |
112 | is_dir = 1; | |
113 | } | |
114 | if (is_dir && dir_prefix(base, path)) { | |
115 | replace_dir(buf, git_dir_len, get_git_common_dir()); | |
116 | return; | |
117 | } | |
118 | if (!is_dir && !strcmp(base, path)) { | |
119 | replace_dir(buf, git_dir_len, get_git_common_dir()); | |
120 | return; | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
557bd833 NTND |
125 | static void adjust_git_path(struct strbuf *buf, int git_dir_len) |
126 | { | |
127 | const char *base = buf->buf + git_dir_len; | |
128 | if (git_graft_env && is_dir_file(base, "info", "grafts")) | |
129 | strbuf_splice(buf, 0, buf->len, | |
130 | get_graft_file(), strlen(get_graft_file())); | |
131 | else if (git_index_env && !strcmp(base, "index")) | |
132 | strbuf_splice(buf, 0, buf->len, | |
133 | get_index_file(), strlen(get_index_file())); | |
134 | else if (git_db_env && dir_prefix(base, "objects")) | |
135 | replace_dir(buf, git_dir_len + 7, get_object_directory()); | |
c7b3a3d2 NTND |
136 | else if (git_common_dir_env) |
137 | update_common_dir(buf, git_dir_len); | |
557bd833 NTND |
138 | } |
139 | ||
8afdaf39 | 140 | static void do_git_path(struct strbuf *buf, const char *fmt, va_list args) |
fe2d7776 | 141 | { |
557bd833 NTND |
142 | int gitdir_len; |
143 | strbuf_addstr(buf, get_git_dir()); | |
4ef9caf5 NTND |
144 | if (buf->len && !is_dir_sep(buf->buf[buf->len - 1])) |
145 | strbuf_addch(buf, '/'); | |
557bd833 | 146 | gitdir_len = buf->len; |
4ef9caf5 | 147 | strbuf_vaddf(buf, fmt, args); |
557bd833 | 148 | adjust_git_path(buf, gitdir_len); |
4ef9caf5 | 149 | strbuf_cleanup_path(buf); |
fe2d7776 AR |
150 | } |
151 | ||
1a83c240 | 152 | void strbuf_git_path(struct strbuf *sb, const char *fmt, ...) |
aba13e7c AR |
153 | { |
154 | va_list args; | |
155 | va_start(args, fmt); | |
8afdaf39 | 156 | do_git_path(sb, fmt, args); |
aba13e7c | 157 | va_end(args); |
aba13e7c AR |
158 | } |
159 | ||
57a23b77 NTND |
160 | const char *git_path(const char *fmt, ...) |
161 | { | |
162 | struct strbuf *pathname = get_pathname(); | |
163 | va_list args; | |
164 | va_start(args, fmt); | |
165 | do_git_path(pathname, fmt, args); | |
166 | va_end(args); | |
167 | return pathname->buf; | |
168 | } | |
169 | ||
aba13e7c AR |
170 | char *git_pathdup(const char *fmt, ...) |
171 | { | |
4ef9caf5 | 172 | struct strbuf path = STRBUF_INIT; |
aba13e7c AR |
173 | va_list args; |
174 | va_start(args, fmt); | |
8afdaf39 | 175 | do_git_path(&path, fmt, args); |
aba13e7c | 176 | va_end(args); |
4ef9caf5 | 177 | return strbuf_detach(&path, NULL); |
aba13e7c AR |
178 | } |
179 | ||
21cf3227 HKNN |
180 | char *mkpathdup(const char *fmt, ...) |
181 | { | |
21cf3227 HKNN |
182 | struct strbuf sb = STRBUF_INIT; |
183 | va_list args; | |
21cf3227 HKNN |
184 | va_start(args, fmt); |
185 | strbuf_vaddf(&sb, fmt, args); | |
186 | va_end(args); | |
4ef9caf5 NTND |
187 | strbuf_cleanup_path(&sb); |
188 | return strbuf_detach(&sb, NULL); | |
21cf3227 HKNN |
189 | } |
190 | ||
dcf69262 | 191 | const char *mkpath(const char *fmt, ...) |
26c8a533 LT |
192 | { |
193 | va_list args; | |
4ef9caf5 | 194 | struct strbuf *pathname = get_pathname(); |
26c8a533 | 195 | va_start(args, fmt); |
4ef9caf5 | 196 | strbuf_vaddf(pathname, fmt, args); |
26c8a533 | 197 | va_end(args); |
4ef9caf5 | 198 | return cleanup_path(pathname->buf); |
26c8a533 LT |
199 | } |
200 | ||
21cf3227 HKNN |
201 | void home_config_paths(char **global, char **xdg, char *file) |
202 | { | |
203 | char *xdg_home = getenv("XDG_CONFIG_HOME"); | |
204 | char *home = getenv("HOME"); | |
205 | char *to_free = NULL; | |
206 | ||
207 | if (!home) { | |
208 | if (global) | |
209 | *global = NULL; | |
210 | } else { | |
211 | if (!xdg_home) { | |
212 | to_free = mkpathdup("%s/.config", home); | |
213 | xdg_home = to_free; | |
214 | } | |
215 | if (global) | |
216 | *global = mkpathdup("%s/.gitconfig", home); | |
217 | } | |
218 | ||
06b2d872 MM |
219 | if (xdg) { |
220 | if (!xdg_home) | |
221 | *xdg = NULL; | |
222 | else | |
223 | *xdg = mkpathdup("%s/git/%s", xdg_home, file); | |
224 | } | |
21cf3227 HKNN |
225 | |
226 | free(to_free); | |
227 | } | |
228 | ||
dcf69262 | 229 | const char *git_path_submodule(const char *path, const char *fmt, ...) |
0bad611b | 230 | { |
4ef9caf5 | 231 | struct strbuf *buf = get_pathname(); |
0bad611b HV |
232 | const char *git_dir; |
233 | va_list args; | |
0bad611b | 234 | |
4ef9caf5 NTND |
235 | strbuf_addstr(buf, path); |
236 | if (buf->len && buf->buf[buf->len - 1] != '/') | |
237 | strbuf_addch(buf, '/'); | |
238 | strbuf_addstr(buf, ".git"); | |
0bad611b | 239 | |
4ef9caf5 | 240 | git_dir = read_gitfile(buf->buf); |
0bad611b | 241 | if (git_dir) { |
4ef9caf5 NTND |
242 | strbuf_reset(buf); |
243 | strbuf_addstr(buf, git_dir); | |
0bad611b | 244 | } |
4ef9caf5 | 245 | strbuf_addch(buf, '/'); |
0bad611b HV |
246 | |
247 | va_start(args, fmt); | |
4ef9caf5 | 248 | strbuf_vaddf(buf, fmt, args); |
0bad611b | 249 | va_end(args); |
4ef9caf5 NTND |
250 | strbuf_cleanup_path(buf); |
251 | return buf->buf; | |
0bad611b | 252 | } |
f2db68ed | 253 | |
c847f537 | 254 | int validate_headref(const char *path) |
0870ca7f JH |
255 | { |
256 | struct stat st; | |
257 | char *buf, buffer[256]; | |
c847f537 | 258 | unsigned char sha1[20]; |
0104ca09 HO |
259 | int fd; |
260 | ssize_t len; | |
0870ca7f JH |
261 | |
262 | if (lstat(path, &st) < 0) | |
263 | return -1; | |
264 | ||
265 | /* Make sure it is a "refs/.." symlink */ | |
266 | if (S_ISLNK(st.st_mode)) { | |
267 | len = readlink(path, buffer, sizeof(buffer)-1); | |
222b1673 | 268 | if (len >= 5 && !memcmp("refs/", buffer, 5)) |
0870ca7f JH |
269 | return 0; |
270 | return -1; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Anything else, just open it and try to see if it is a symbolic ref. | |
275 | */ | |
276 | fd = open(path, O_RDONLY); | |
277 | if (fd < 0) | |
278 | return -1; | |
93d26e4c | 279 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
0870ca7f JH |
280 | close(fd); |
281 | ||
282 | /* | |
283 | * Is it a symbolic ref? | |
284 | */ | |
c847f537 | 285 | if (len < 4) |
0870ca7f | 286 | return -1; |
c847f537 JH |
287 | if (!memcmp("ref:", buffer, 4)) { |
288 | buf = buffer + 4; | |
289 | len -= 4; | |
290 | while (len && isspace(*buf)) | |
291 | buf++, len--; | |
222b1673 | 292 | if (len >= 5 && !memcmp("refs/", buf, 5)) |
c847f537 JH |
293 | return 0; |
294 | } | |
295 | ||
296 | /* | |
297 | * Is this a detached HEAD? | |
298 | */ | |
299 | if (!get_sha1_hex(buffer, sha1)) | |
0870ca7f | 300 | return 0; |
c847f537 | 301 | |
0870ca7f JH |
302 | return -1; |
303 | } | |
304 | ||
395de250 | 305 | static struct passwd *getpw_str(const char *username, size_t len) |
54f4b874 | 306 | { |
d79374c7 | 307 | struct passwd *pw; |
5c0b13f8 | 308 | char *username_z = xmemdupz(username, len); |
395de250 MM |
309 | pw = getpwnam(username_z); |
310 | free(username_z); | |
311 | return pw; | |
312 | } | |
54f4b874 | 313 | |
395de250 MM |
314 | /* |
315 | * Return a string with ~ and ~user expanded via getpw*. If buf != NULL, | |
316 | * then it is a newly allocated string. Returns NULL on getpw failure or | |
317 | * if path is NULL. | |
318 | */ | |
319 | char *expand_user_path(const char *path) | |
320 | { | |
321 | struct strbuf user_path = STRBUF_INIT; | |
395de250 MM |
322 | const char *to_copy = path; |
323 | ||
324 | if (path == NULL) | |
325 | goto return_null; | |
326 | if (path[0] == '~') { | |
53ec551c | 327 | const char *first_slash = strchrnul(path, '/'); |
395de250 MM |
328 | const char *username = path + 1; |
329 | size_t username_len = first_slash - username; | |
df2a79f4 MM |
330 | if (username_len == 0) { |
331 | const char *home = getenv("HOME"); | |
79bf1490 JN |
332 | if (!home) |
333 | goto return_null; | |
cedc61a9 | 334 | strbuf_addstr(&user_path, home); |
df2a79f4 MM |
335 | } else { |
336 | struct passwd *pw = getpw_str(username, username_len); | |
337 | if (!pw) | |
338 | goto return_null; | |
cedc61a9 | 339 | strbuf_addstr(&user_path, pw->pw_dir); |
54f4b874 | 340 | } |
395de250 | 341 | to_copy = first_slash; |
d79374c7 | 342 | } |
cedc61a9 | 343 | strbuf_addstr(&user_path, to_copy); |
395de250 MM |
344 | return strbuf_detach(&user_path, NULL); |
345 | return_null: | |
346 | strbuf_release(&user_path); | |
347 | return NULL; | |
54f4b874 AE |
348 | } |
349 | ||
d79374c7 JH |
350 | /* |
351 | * First, one directory to try is determined by the following algorithm. | |
352 | * | |
353 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
354 | * done. Otherwise: | |
355 | * (1) "~/path" to mean path under the running user's home directory; | |
356 | * (2) "~user/path" to mean path under named user's home directory; | |
357 | * (3) "relative/path" to mean cwd relative directory; or | |
358 | * (4) "/absolute/path" to mean absolute directory. | |
359 | * | |
360 | * Unless "strict" is given, we try access() for existence of "%s.git/.git", | |
361 | * "%s/.git", "%s.git", "%s" in this order. The first one that exists is | |
362 | * what we try. | |
363 | * | |
364 | * Second, we try chdir() to that. Upon failure, we return NULL. | |
365 | * | |
366 | * Then, we try if the current directory is a valid git repository. | |
367 | * Upon failure, we return NULL. | |
368 | * | |
369 | * If all goes well, we return the directory we used to chdir() (but | |
370 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
371 | * links. User relative paths are also returned as they are given, | |
372 | * except DWIM suffixing. | |
373 | */ | |
1c64b48e | 374 | const char *enter_repo(const char *path, int strict) |
54f4b874 | 375 | { |
d79374c7 JH |
376 | static char used_path[PATH_MAX]; |
377 | static char validated_path[PATH_MAX]; | |
378 | ||
379 | if (!path) | |
54f4b874 AE |
380 | return NULL; |
381 | ||
d79374c7 JH |
382 | if (!strict) { |
383 | static const char *suffix[] = { | |
b3256eb8 | 384 | "/.git", "", ".git/.git", ".git", NULL, |
d79374c7 | 385 | }; |
03106768 | 386 | const char *gitfile; |
d79374c7 JH |
387 | int len = strlen(path); |
388 | int i; | |
1c64b48e | 389 | while ((1 < len) && (path[len-1] == '/')) |
d79374c7 | 390 | len--; |
1c64b48e | 391 | |
d79374c7 | 392 | if (PATH_MAX <= len) |
54f4b874 | 393 | return NULL; |
1c64b48e EFL |
394 | strncpy(used_path, path, len); used_path[len] = 0 ; |
395 | strcpy(validated_path, used_path); | |
396 | ||
397 | if (used_path[0] == '~') { | |
398 | char *newpath = expand_user_path(used_path); | |
395de250 MM |
399 | if (!newpath || (PATH_MAX - 10 < strlen(newpath))) { |
400 | free(newpath); | |
d79374c7 | 401 | return NULL; |
395de250 MM |
402 | } |
403 | /* | |
404 | * Copy back into the static buffer. A pity | |
405 | * since newpath was not bounded, but other | |
406 | * branches of the if are limited by PATH_MAX | |
407 | * anyway. | |
408 | */ | |
409 | strcpy(used_path, newpath); free(newpath); | |
d79374c7 JH |
410 | } |
411 | else if (PATH_MAX - 10 < len) | |
412 | return NULL; | |
1c64b48e | 413 | len = strlen(used_path); |
d79374c7 | 414 | for (i = 0; suffix[i]; i++) { |
b3256eb8 | 415 | struct stat st; |
1c64b48e | 416 | strcpy(used_path + len, suffix[i]); |
b3256eb8 JK |
417 | if (!stat(used_path, &st) && |
418 | (S_ISREG(st.st_mode) || | |
419 | (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) { | |
d79374c7 JH |
420 | strcat(validated_path, suffix[i]); |
421 | break; | |
422 | } | |
423 | } | |
03106768 PH |
424 | if (!suffix[i]) |
425 | return NULL; | |
426 | gitfile = read_gitfile(used_path) ; | |
427 | if (gitfile) | |
428 | strcpy(used_path, gitfile); | |
429 | if (chdir(used_path)) | |
0870ca7f | 430 | return NULL; |
d79374c7 | 431 | path = validated_path; |
0870ca7f | 432 | } |
d79374c7 JH |
433 | else if (chdir(path)) |
434 | return NULL; | |
54f4b874 | 435 | |
d79374c7 | 436 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && |
c847f537 | 437 | validate_headref("HEAD") == 0) { |
717c3972 | 438 | set_git_dir("."); |
1644162a | 439 | check_repository_format(); |
d79374c7 | 440 | return path; |
54f4b874 AE |
441 | } |
442 | ||
443 | return NULL; | |
444 | } | |
138086a7 | 445 | |
cbe43b84 | 446 | static int calc_shared_perm(int mode) |
138086a7 | 447 | { |
cbe43b84 | 448 | int tweak; |
138086a7 | 449 | |
5a688fe4 | 450 | if (shared_repository < 0) |
cbe43b84 | 451 | tweak = -shared_repository; |
5a688fe4 | 452 | else |
cbe43b84 | 453 | tweak = shared_repository; |
5a688fe4 JH |
454 | |
455 | if (!(mode & S_IWUSR)) | |
456 | tweak &= ~0222; | |
457 | if (mode & S_IXUSR) | |
458 | /* Copy read bits to execute bits */ | |
459 | tweak |= (tweak & 0444) >> 2; | |
460 | if (shared_repository < 0) | |
461 | mode = (mode & ~0777) | tweak; | |
462 | else | |
8c6202d8 | 463 | mode |= tweak; |
06cbe855 | 464 | |
cbe43b84 TB |
465 | return mode; |
466 | } | |
467 | ||
468 | ||
469 | int adjust_shared_perm(const char *path) | |
470 | { | |
471 | int old_mode, new_mode; | |
472 | ||
473 | if (!shared_repository) | |
474 | return 0; | |
475 | if (get_st_mode_bits(path, &old_mode) < 0) | |
476 | return -1; | |
477 | ||
478 | new_mode = calc_shared_perm(old_mode); | |
479 | if (S_ISDIR(old_mode)) { | |
06cbe855 | 480 | /* Copy read bits to execute bits */ |
cbe43b84 TB |
481 | new_mode |= (new_mode & 0444) >> 2; |
482 | new_mode |= FORCE_DIR_SET_GID; | |
06cbe855 HO |
483 | } |
484 | ||
cbe43b84 TB |
485 | if (((old_mode ^ new_mode) & ~S_IFMT) && |
486 | chmod(path, (new_mode & ~S_IFMT)) < 0) | |
138086a7 JH |
487 | return -2; |
488 | return 0; | |
489 | } | |
e5392c51 | 490 | |
7fbd4221 JX |
491 | static int have_same_root(const char *path1, const char *path2) |
492 | { | |
493 | int is_abs1, is_abs2; | |
494 | ||
495 | is_abs1 = is_absolute_path(path1); | |
496 | is_abs2 = is_absolute_path(path2); | |
497 | return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) || | |
498 | (!is_abs1 && !is_abs2); | |
499 | } | |
500 | ||
e02ca72f JX |
501 | /* |
502 | * Give path as relative to prefix. | |
503 | * | |
504 | * The strbuf may or may not be used, so do not assume it contains the | |
505 | * returned path. | |
506 | */ | |
507 | const char *relative_path(const char *in, const char *prefix, | |
508 | struct strbuf *sb) | |
044bbbcb | 509 | { |
e02ca72f JX |
510 | int in_len = in ? strlen(in) : 0; |
511 | int prefix_len = prefix ? strlen(prefix) : 0; | |
512 | int in_off = 0; | |
513 | int prefix_off = 0; | |
288123f0 JH |
514 | int i = 0, j = 0; |
515 | ||
e02ca72f JX |
516 | if (!in_len) |
517 | return "./"; | |
518 | else if (!prefix_len) | |
519 | return in; | |
520 | ||
7fbd4221 JX |
521 | if (have_same_root(in, prefix)) { |
522 | /* bypass dos_drive, for "c:" is identical to "C:" */ | |
523 | if (has_dos_drive_prefix(in)) { | |
524 | i = 2; | |
525 | j = 2; | |
526 | } | |
527 | } else { | |
528 | return in; | |
529 | } | |
530 | ||
e02ca72f JX |
531 | while (i < prefix_len && j < in_len && prefix[i] == in[j]) { |
532 | if (is_dir_sep(prefix[i])) { | |
533 | while (is_dir_sep(prefix[i])) | |
288123f0 | 534 | i++; |
e02ca72f JX |
535 | while (is_dir_sep(in[j])) |
536 | j++; | |
537 | prefix_off = i; | |
538 | in_off = j; | |
539 | } else { | |
540 | i++; | |
541 | j++; | |
542 | } | |
543 | } | |
544 | ||
545 | if ( | |
546 | /* "prefix" seems like prefix of "in" */ | |
547 | i >= prefix_len && | |
548 | /* | |
549 | * but "/foo" is not a prefix of "/foobar" | |
550 | * (i.e. prefix not end with '/') | |
551 | */ | |
552 | prefix_off < prefix_len) { | |
553 | if (j >= in_len) { | |
554 | /* in="/a/b", prefix="/a/b" */ | |
555 | in_off = in_len; | |
556 | } else if (is_dir_sep(in[j])) { | |
557 | /* in="/a/b/c", prefix="/a/b" */ | |
558 | while (is_dir_sep(in[j])) | |
288123f0 | 559 | j++; |
e02ca72f JX |
560 | in_off = j; |
561 | } else { | |
562 | /* in="/a/bbb/c", prefix="/a/b" */ | |
563 | i = prefix_off; | |
564 | } | |
565 | } else if ( | |
566 | /* "in" is short than "prefix" */ | |
567 | j >= in_len && | |
568 | /* "in" not end with '/' */ | |
569 | in_off < in_len) { | |
570 | if (is_dir_sep(prefix[i])) { | |
571 | /* in="/a/b", prefix="/a/b/c/" */ | |
572 | while (is_dir_sep(prefix[i])) | |
573 | i++; | |
574 | in_off = in_len; | |
575 | } | |
576 | } | |
577 | in += in_off; | |
578 | in_len -= in_off; | |
579 | ||
580 | if (i >= prefix_len) { | |
581 | if (!in_len) | |
582 | return "./"; | |
583 | else | |
584 | return in; | |
585 | } | |
586 | ||
587 | strbuf_reset(sb); | |
588 | strbuf_grow(sb, in_len); | |
589 | ||
590 | while (i < prefix_len) { | |
591 | if (is_dir_sep(prefix[i])) { | |
592 | strbuf_addstr(sb, "../"); | |
593 | while (is_dir_sep(prefix[i])) | |
594 | i++; | |
288123f0 | 595 | continue; |
288123f0 JH |
596 | } |
597 | i++; | |
288123f0 | 598 | } |
e02ca72f JX |
599 | if (!is_dir_sep(prefix[prefix_len - 1])) |
600 | strbuf_addstr(sb, "../"); | |
601 | ||
602 | strbuf_addstr(sb, in); | |
603 | ||
604 | return sb->buf; | |
044bbbcb | 605 | } |
ae299be0 | 606 | |
41894ae3 JX |
607 | /* |
608 | * A simpler implementation of relative_path | |
609 | * | |
610 | * Get relative path by removing "prefix" from "in". This function | |
611 | * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter | |
612 | * to increase performance when traversing the path to work_tree. | |
613 | */ | |
614 | const char *remove_leading_path(const char *in, const char *prefix) | |
615 | { | |
616 | static char buf[PATH_MAX + 1]; | |
617 | int i = 0, j = 0; | |
618 | ||
619 | if (!prefix || !prefix[0]) | |
620 | return in; | |
621 | while (prefix[i]) { | |
622 | if (is_dir_sep(prefix[i])) { | |
623 | if (!is_dir_sep(in[j])) | |
624 | return in; | |
625 | while (is_dir_sep(prefix[i])) | |
626 | i++; | |
627 | while (is_dir_sep(in[j])) | |
628 | j++; | |
629 | continue; | |
630 | } else if (in[j] != prefix[i]) { | |
631 | return in; | |
632 | } | |
633 | i++; | |
634 | j++; | |
635 | } | |
636 | if ( | |
637 | /* "/foo" is a prefix of "/foo" */ | |
638 | in[j] && | |
639 | /* "/foo" is not a prefix of "/foobar" */ | |
640 | !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j]) | |
641 | ) | |
642 | return in; | |
643 | while (is_dir_sep(in[j])) | |
644 | j++; | |
645 | if (!in[j]) | |
646 | strcpy(buf, "."); | |
647 | else | |
648 | strcpy(buf, in + j); | |
649 | return buf; | |
650 | } | |
651 | ||
ae299be0 | 652 | /* |
f2a782b8 | 653 | * It is okay if dst == src, but they should not overlap otherwise. |
ae299be0 | 654 | * |
f2a782b8 JS |
655 | * Performs the following normalizations on src, storing the result in dst: |
656 | * - Ensures that components are separated by '/' (Windows only) | |
657 | * - Squashes sequences of '/'. | |
ae299be0 DR |
658 | * - Removes "." components. |
659 | * - Removes ".." components, and the components the precede them. | |
f2a782b8 JS |
660 | * Returns failure (non-zero) if a ".." component appears as first path |
661 | * component anytime during the normalization. Otherwise, returns success (0). | |
ae299be0 DR |
662 | * |
663 | * Note that this function is purely textual. It does not follow symlinks, | |
664 | * verify the existence of the path, or make any system calls. | |
645a29c4 NTND |
665 | * |
666 | * prefix_len != NULL is for a specific case of prefix_pathspec(): | |
667 | * assume that src == dst and src[0..prefix_len-1] is already | |
668 | * normalized, any time "../" eats up to the prefix_len part, | |
669 | * prefix_len is reduced. In the end prefix_len is the remaining | |
670 | * prefix that has not been overridden by user pathspec. | |
ae299be0 | 671 | */ |
645a29c4 | 672 | int normalize_path_copy_len(char *dst, const char *src, int *prefix_len) |
ae299be0 | 673 | { |
f3cad0ad | 674 | char *dst0; |
ae299be0 | 675 | |
f3cad0ad JS |
676 | if (has_dos_drive_prefix(src)) { |
677 | *dst++ = *src++; | |
678 | *dst++ = *src++; | |
ae299be0 | 679 | } |
f3cad0ad | 680 | dst0 = dst; |
ae299be0 | 681 | |
f3cad0ad | 682 | if (is_dir_sep(*src)) { |
ae299be0 | 683 | *dst++ = '/'; |
f3cad0ad JS |
684 | while (is_dir_sep(*src)) |
685 | src++; | |
686 | } | |
687 | ||
688 | for (;;) { | |
689 | char c = *src; | |
690 | ||
691 | /* | |
692 | * A path component that begins with . could be | |
693 | * special: | |
694 | * (1) "." and ends -- ignore and terminate. | |
695 | * (2) "./" -- ignore them, eat slash and continue. | |
696 | * (3) ".." and ends -- strip one and terminate. | |
697 | * (4) "../" -- strip one, eat slash and continue. | |
698 | */ | |
699 | if (c == '.') { | |
700 | if (!src[1]) { | |
701 | /* (1) */ | |
702 | src++; | |
703 | } else if (is_dir_sep(src[1])) { | |
704 | /* (2) */ | |
705 | src += 2; | |
706 | while (is_dir_sep(*src)) | |
707 | src++; | |
708 | continue; | |
709 | } else if (src[1] == '.') { | |
710 | if (!src[2]) { | |
711 | /* (3) */ | |
712 | src += 2; | |
713 | goto up_one; | |
714 | } else if (is_dir_sep(src[2])) { | |
715 | /* (4) */ | |
716 | src += 3; | |
717 | while (is_dir_sep(*src)) | |
718 | src++; | |
719 | goto up_one; | |
720 | } | |
721 | } | |
722 | } | |
ae299be0 | 723 | |
f3cad0ad JS |
724 | /* copy up to the next '/', and eat all '/' */ |
725 | while ((c = *src++) != '\0' && !is_dir_sep(c)) | |
726 | *dst++ = c; | |
727 | if (is_dir_sep(c)) { | |
728 | *dst++ = '/'; | |
729 | while (is_dir_sep(c)) | |
730 | c = *src++; | |
731 | src--; | |
732 | } else if (!c) | |
733 | break; | |
734 | continue; | |
735 | ||
736 | up_one: | |
737 | /* | |
738 | * dst0..dst is prefix portion, and dst[-1] is '/'; | |
739 | * go up one level. | |
740 | */ | |
f42302b4 JS |
741 | dst--; /* go to trailing '/' */ |
742 | if (dst <= dst0) | |
f3cad0ad | 743 | return -1; |
f42302b4 JS |
744 | /* Windows: dst[-1] cannot be backslash anymore */ |
745 | while (dst0 < dst && dst[-1] != '/') | |
746 | dst--; | |
645a29c4 NTND |
747 | if (prefix_len && *prefix_len > dst - dst0) |
748 | *prefix_len = dst - dst0; | |
f3cad0ad | 749 | } |
ae299be0 | 750 | *dst = '\0'; |
f3cad0ad | 751 | return 0; |
ae299be0 | 752 | } |
0454dd93 | 753 | |
645a29c4 NTND |
754 | int normalize_path_copy(char *dst, const char *src) |
755 | { | |
756 | return normalize_path_copy_len(dst, src, NULL); | |
757 | } | |
758 | ||
0454dd93 DR |
759 | /* |
760 | * path = Canonical absolute path | |
9e2326c7 MH |
761 | * prefixes = string_list containing normalized, absolute paths without |
762 | * trailing slashes (except for the root directory, which is denoted by "/"). | |
0454dd93 | 763 | * |
9e2326c7 | 764 | * Determines, for each path in prefixes, whether the "prefix" |
0454dd93 DR |
765 | * is an ancestor directory of path. Returns the length of the longest |
766 | * ancestor directory, excluding any trailing slashes, or -1 if no prefix | |
31171d9e MH |
767 | * is an ancestor. (Note that this means 0 is returned if prefixes is |
768 | * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories | |
0454dd93 DR |
769 | * are not considered to be their own ancestors. path must be in a |
770 | * canonical form: empty components, or "." or ".." components are not | |
9e2326c7 | 771 | * allowed. |
0454dd93 | 772 | */ |
31171d9e | 773 | int longest_ancestor_length(const char *path, struct string_list *prefixes) |
0454dd93 | 774 | { |
a5ccdbe4 | 775 | int i, max_len = -1; |
0454dd93 | 776 | |
31171d9e | 777 | if (!strcmp(path, "/")) |
0454dd93 DR |
778 | return -1; |
779 | ||
31171d9e MH |
780 | for (i = 0; i < prefixes->nr; i++) { |
781 | const char *ceil = prefixes->items[i].string; | |
a5ccdbe4 MH |
782 | int len = strlen(ceil); |
783 | ||
9e2326c7 MH |
784 | if (len == 1 && ceil[0] == '/') |
785 | len = 0; /* root matches anything, with length 0 */ | |
786 | else if (!strncmp(path, ceil, len) && path[len] == '/') | |
787 | ; /* match of length len */ | |
788 | else | |
789 | continue; /* no match */ | |
0454dd93 | 790 | |
9e2326c7 | 791 | if (len > max_len) |
0454dd93 | 792 | max_len = len; |
0454dd93 DR |
793 | } |
794 | ||
795 | return max_len; | |
796 | } | |
4fcc86b0 JS |
797 | |
798 | /* strip arbitrary amount of directory separators at end of path */ | |
799 | static inline int chomp_trailing_dir_sep(const char *path, int len) | |
800 | { | |
801 | while (len && is_dir_sep(path[len - 1])) | |
802 | len--; | |
803 | return len; | |
804 | } | |
805 | ||
806 | /* | |
807 | * If path ends with suffix (complete path components), returns the | |
808 | * part before suffix (sans trailing directory separators). | |
809 | * Otherwise returns NULL. | |
810 | */ | |
811 | char *strip_path_suffix(const char *path, const char *suffix) | |
812 | { | |
813 | int path_len = strlen(path), suffix_len = strlen(suffix); | |
814 | ||
815 | while (suffix_len) { | |
816 | if (!path_len) | |
817 | return NULL; | |
818 | ||
819 | if (is_dir_sep(path[path_len - 1])) { | |
820 | if (!is_dir_sep(suffix[suffix_len - 1])) | |
821 | return NULL; | |
822 | path_len = chomp_trailing_dir_sep(path, path_len); | |
823 | suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); | |
824 | } | |
825 | else if (path[--path_len] != suffix[--suffix_len]) | |
826 | return NULL; | |
827 | } | |
828 | ||
829 | if (path_len && !is_dir_sep(path[path_len - 1])) | |
830 | return NULL; | |
831 | return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); | |
832 | } | |
34b6cb8b SP |
833 | |
834 | int daemon_avoid_alias(const char *p) | |
835 | { | |
836 | int sl, ndot; | |
837 | ||
838 | /* | |
839 | * This resurrects the belts and suspenders paranoia check by HPA | |
840 | * done in <435560F7.4080006@zytor.com> thread, now enter_repo() | |
9517e6b8 | 841 | * does not do getcwd() based path canonicalization. |
34b6cb8b SP |
842 | * |
843 | * sl becomes true immediately after seeing '/' and continues to | |
844 | * be true as long as dots continue after that without intervening | |
845 | * non-dot character. | |
846 | */ | |
847 | if (!p || (*p != '/' && *p != '~')) | |
848 | return -1; | |
849 | sl = 1; ndot = 0; | |
850 | p++; | |
851 | ||
852 | while (1) { | |
853 | char ch = *p++; | |
854 | if (sl) { | |
855 | if (ch == '.') | |
856 | ndot++; | |
857 | else if (ch == '/') { | |
858 | if (ndot < 3) | |
859 | /* reject //, /./ and /../ */ | |
860 | return -1; | |
861 | ndot = 0; | |
862 | } | |
863 | else if (ch == 0) { | |
864 | if (0 < ndot && ndot < 3) | |
865 | /* reject /.$ and /..$ */ | |
866 | return -1; | |
867 | return 0; | |
868 | } | |
869 | else | |
870 | sl = ndot = 0; | |
871 | } | |
872 | else if (ch == 0) | |
873 | return 0; | |
874 | else if (ch == '/') { | |
875 | sl = 1; | |
876 | ndot = 0; | |
877 | } | |
878 | } | |
879 | } |