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Commit | Line | Data |
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26c8a533 LT |
1 | /* |
2 | * I'm tired of doing "vsnprintf()" etc just to open a | |
3 | * file, so here's a "return static buffer with printf" | |
4 | * interface for paths. | |
5 | * | |
6 | * It's obviously not thread-safe. Sue me. But it's quite | |
7 | * useful for doing things like | |
8 | * | |
9 | * f = open(mkpath("%s/%s.git", base, name), O_RDONLY); | |
10 | * | |
11 | * which is what it's designed for. | |
12 | */ | |
13 | #include "cache.h" | |
14 | ||
26c8a533 LT |
15 | static char bad_path[] = "/bad-path/"; |
16 | ||
e7676d2f LT |
17 | static char *get_pathname(void) |
18 | { | |
19 | static char pathname_array[4][PATH_MAX]; | |
20 | static int index; | |
21 | return pathname_array[3 & ++index]; | |
22 | } | |
23 | ||
26c8a533 LT |
24 | static char *cleanup_path(char *path) |
25 | { | |
26 | /* Clean it up */ | |
27 | if (!memcmp(path, "./", 2)) { | |
28 | path += 2; | |
29 | while (*path == '/') | |
30 | path++; | |
31 | } | |
32 | return path; | |
33 | } | |
34 | ||
35 | char *mkpath(const char *fmt, ...) | |
36 | { | |
37 | va_list args; | |
38 | unsigned len; | |
e7676d2f | 39 | char *pathname = get_pathname(); |
26c8a533 LT |
40 | |
41 | va_start(args, fmt); | |
42 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
43 | va_end(args); | |
44 | if (len >= PATH_MAX) | |
45 | return bad_path; | |
46 | return cleanup_path(pathname); | |
47 | } | |
48 | ||
49 | char *git_path(const char *fmt, ...) | |
50 | { | |
5da1606d | 51 | const char *git_dir = get_git_dir(); |
e7676d2f | 52 | char *pathname = get_pathname(); |
26c8a533 LT |
53 | va_list args; |
54 | unsigned len; | |
55 | ||
56 | len = strlen(git_dir); | |
57 | if (len > PATH_MAX-100) | |
58 | return bad_path; | |
59 | memcpy(pathname, git_dir, len); | |
60 | if (len && git_dir[len-1] != '/') | |
61 | pathname[len++] = '/'; | |
62 | va_start(args, fmt); | |
63 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); | |
64 | va_end(args); | |
65 | if (len >= PATH_MAX) | |
66 | return bad_path; | |
67 | return cleanup_path(pathname); | |
68 | } | |
f2db68ed HE |
69 | |
70 | ||
71 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ | |
72 | int git_mkstemp(char *path, size_t len, const char *template) | |
73 | { | |
e7a7be88 JH |
74 | const char *tmp; |
75 | size_t n; | |
76 | ||
77 | tmp = getenv("TMPDIR"); | |
78 | if (!tmp) | |
79 | tmp = "/tmp"; | |
80 | n = snprintf(path, len, "%s/%s", tmp, template); | |
81 | if (len <= n) { | |
82 | errno = ENAMETOOLONG; | |
83 | return -1; | |
35c3c629 | 84 | } |
f2db68ed HE |
85 | return mkstemp(path); |
86 | } | |
87 | ||
88 | ||
c847f537 | 89 | int validate_headref(const char *path) |
0870ca7f JH |
90 | { |
91 | struct stat st; | |
92 | char *buf, buffer[256]; | |
c847f537 | 93 | unsigned char sha1[20]; |
0104ca09 HO |
94 | int fd; |
95 | ssize_t len; | |
0870ca7f JH |
96 | |
97 | if (lstat(path, &st) < 0) | |
98 | return -1; | |
99 | ||
100 | /* Make sure it is a "refs/.." symlink */ | |
101 | if (S_ISLNK(st.st_mode)) { | |
102 | len = readlink(path, buffer, sizeof(buffer)-1); | |
103 | if (len >= 5 && !memcmp("refs/", buffer, 5)) | |
104 | return 0; | |
105 | return -1; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Anything else, just open it and try to see if it is a symbolic ref. | |
110 | */ | |
111 | fd = open(path, O_RDONLY); | |
112 | if (fd < 0) | |
113 | return -1; | |
93d26e4c | 114 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
0870ca7f JH |
115 | close(fd); |
116 | ||
117 | /* | |
118 | * Is it a symbolic ref? | |
119 | */ | |
c847f537 | 120 | if (len < 4) |
0870ca7f | 121 | return -1; |
c847f537 JH |
122 | if (!memcmp("ref:", buffer, 4)) { |
123 | buf = buffer + 4; | |
124 | len -= 4; | |
125 | while (len && isspace(*buf)) | |
126 | buf++, len--; | |
127 | if (len >= 5 && !memcmp("refs/", buf, 5)) | |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Is this a detached HEAD? | |
133 | */ | |
134 | if (!get_sha1_hex(buffer, sha1)) | |
0870ca7f | 135 | return 0; |
c847f537 | 136 | |
0870ca7f JH |
137 | return -1; |
138 | } | |
139 | ||
d79374c7 | 140 | static char *user_path(char *buf, char *path, int sz) |
54f4b874 | 141 | { |
d79374c7 JH |
142 | struct passwd *pw; |
143 | char *slash; | |
144 | int len, baselen; | |
54f4b874 | 145 | |
d79374c7 JH |
146 | if (!path || path[0] != '~') |
147 | return NULL; | |
148 | path++; | |
149 | slash = strchr(path, '/'); | |
150 | if (path[0] == '/' || !path[0]) { | |
151 | pw = getpwuid(getuid()); | |
152 | } | |
153 | else { | |
154 | if (slash) { | |
155 | *slash = 0; | |
156 | pw = getpwnam(path); | |
157 | *slash = '/'; | |
54f4b874 | 158 | } |
d79374c7 JH |
159 | else |
160 | pw = getpwnam(path); | |
54f4b874 | 161 | } |
d79374c7 JH |
162 | if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir)) |
163 | return NULL; | |
164 | baselen = strlen(pw->pw_dir); | |
165 | memcpy(buf, pw->pw_dir, baselen); | |
166 | while ((1 < baselen) && (buf[baselen-1] == '/')) { | |
167 | buf[baselen-1] = 0; | |
168 | baselen--; | |
169 | } | |
170 | if (slash && slash[1]) { | |
171 | len = strlen(slash); | |
172 | if (sz <= baselen + len) | |
173 | return NULL; | |
174 | memcpy(buf + baselen, slash, len + 1); | |
175 | } | |
176 | return buf; | |
54f4b874 AE |
177 | } |
178 | ||
d79374c7 JH |
179 | /* |
180 | * First, one directory to try is determined by the following algorithm. | |
181 | * | |
182 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
183 | * done. Otherwise: | |
184 | * (1) "~/path" to mean path under the running user's home directory; | |
185 | * (2) "~user/path" to mean path under named user's home directory; | |
186 | * (3) "relative/path" to mean cwd relative directory; or | |
187 | * (4) "/absolute/path" to mean absolute directory. | |
188 | * | |
189 | * Unless "strict" is given, we try access() for existence of "%s.git/.git", | |
190 | * "%s/.git", "%s.git", "%s" in this order. The first one that exists is | |
191 | * what we try. | |
192 | * | |
193 | * Second, we try chdir() to that. Upon failure, we return NULL. | |
194 | * | |
195 | * Then, we try if the current directory is a valid git repository. | |
196 | * Upon failure, we return NULL. | |
197 | * | |
198 | * If all goes well, we return the directory we used to chdir() (but | |
199 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
200 | * links. User relative paths are also returned as they are given, | |
201 | * except DWIM suffixing. | |
202 | */ | |
54f4b874 AE |
203 | char *enter_repo(char *path, int strict) |
204 | { | |
d79374c7 JH |
205 | static char used_path[PATH_MAX]; |
206 | static char validated_path[PATH_MAX]; | |
207 | ||
208 | if (!path) | |
54f4b874 AE |
209 | return NULL; |
210 | ||
d79374c7 JH |
211 | if (!strict) { |
212 | static const char *suffix[] = { | |
213 | ".git/.git", "/.git", ".git", "", NULL, | |
214 | }; | |
215 | int len = strlen(path); | |
216 | int i; | |
217 | while ((1 < len) && (path[len-1] == '/')) { | |
218 | path[len-1] = 0; | |
219 | len--; | |
220 | } | |
221 | if (PATH_MAX <= len) | |
54f4b874 | 222 | return NULL; |
d79374c7 JH |
223 | if (path[0] == '~') { |
224 | if (!user_path(used_path, path, PATH_MAX)) | |
225 | return NULL; | |
226 | strcpy(validated_path, path); | |
227 | path = used_path; | |
228 | } | |
229 | else if (PATH_MAX - 10 < len) | |
230 | return NULL; | |
231 | else { | |
232 | path = strcpy(used_path, path); | |
233 | strcpy(validated_path, path); | |
234 | } | |
235 | len = strlen(path); | |
236 | for (i = 0; suffix[i]; i++) { | |
237 | strcpy(path + len, suffix[i]); | |
238 | if (!access(path, F_OK)) { | |
239 | strcat(validated_path, suffix[i]); | |
240 | break; | |
241 | } | |
242 | } | |
243 | if (!suffix[i] || chdir(path)) | |
0870ca7f | 244 | return NULL; |
d79374c7 | 245 | path = validated_path; |
0870ca7f | 246 | } |
d79374c7 JH |
247 | else if (chdir(path)) |
248 | return NULL; | |
54f4b874 | 249 | |
d79374c7 | 250 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && |
c847f537 | 251 | validate_headref("HEAD") == 0) { |
7627943a | 252 | setenv(GIT_DIR_ENVIRONMENT, ".", 1); |
1644162a | 253 | check_repository_format(); |
d79374c7 | 254 | return path; |
54f4b874 AE |
255 | } |
256 | ||
257 | return NULL; | |
258 | } | |
138086a7 JH |
259 | |
260 | int adjust_shared_perm(const char *path) | |
261 | { | |
262 | struct stat st; | |
263 | int mode; | |
264 | ||
265 | if (!shared_repository) | |
266 | return 0; | |
267 | if (lstat(path, &st) < 0) | |
268 | return -1; | |
269 | mode = st.st_mode; | |
06cbe855 HO |
270 | |
271 | if (shared_repository) { | |
272 | int tweak = shared_repository; | |
273 | if (!(mode & S_IWUSR)) | |
274 | tweak &= ~0222; | |
8c6202d8 | 275 | mode |= tweak; |
06cbe855 HO |
276 | } else { |
277 | /* Preserve old PERM_UMASK behaviour */ | |
278 | if (mode & S_IWUSR) | |
279 | mode |= S_IWGRP; | |
280 | } | |
281 | ||
282 | if (S_ISDIR(mode)) { | |
81a24b52 | 283 | mode |= FORCE_DIR_SET_GID; |
06cbe855 HO |
284 | |
285 | /* Copy read bits to execute bits */ | |
286 | mode |= (shared_repository & 0444) >> 2; | |
287 | } | |
288 | ||
fe732ede | 289 | if ((mode & st.st_mode) != mode && chmod(path, mode) < 0) |
138086a7 JH |
290 | return -2; |
291 | return 0; | |
292 | } | |
e5392c51 | 293 | |
044bbbcb LT |
294 | const char *make_relative_path(const char *abs, const char *base) |
295 | { | |
296 | static char buf[PATH_MAX + 1]; | |
297 | int baselen; | |
298 | if (!base) | |
299 | return abs; | |
300 | baselen = strlen(base); | |
301 | if (prefixcmp(abs, base)) | |
302 | return abs; | |
303 | if (abs[baselen] == '/') | |
304 | baselen++; | |
305 | else if (base[baselen - 1] != '/') | |
306 | return abs; | |
307 | strcpy(buf, abs + baselen); | |
308 | return buf; | |
309 | } | |
ae299be0 DR |
310 | |
311 | /* | |
312 | * path = absolute path | |
313 | * buf = buffer of at least max(2, strlen(path)+1) bytes | |
314 | * It is okay if buf == path, but they should not overlap otherwise. | |
315 | * | |
316 | * Performs the following normalizations on path, storing the result in buf: | |
317 | * - Removes trailing slashes. | |
318 | * - Removes empty components. | |
319 | * - Removes "." components. | |
320 | * - Removes ".." components, and the components the precede them. | |
321 | * "" and paths that contain only slashes are normalized to "/". | |
322 | * Returns the length of the output. | |
323 | * | |
324 | * Note that this function is purely textual. It does not follow symlinks, | |
325 | * verify the existence of the path, or make any system calls. | |
326 | */ | |
327 | int normalize_absolute_path(char *buf, const char *path) | |
328 | { | |
329 | const char *comp_start = path, *comp_end = path; | |
330 | char *dst = buf; | |
331 | int comp_len; | |
332 | assert(buf); | |
333 | assert(path); | |
334 | ||
335 | while (*comp_start) { | |
336 | assert(*comp_start == '/'); | |
337 | while (*++comp_end && *comp_end != '/') | |
338 | ; /* nothing */ | |
339 | comp_len = comp_end - comp_start; | |
340 | ||
341 | if (!strncmp("/", comp_start, comp_len) || | |
342 | !strncmp("/.", comp_start, comp_len)) | |
343 | goto next; | |
344 | ||
345 | if (!strncmp("/..", comp_start, comp_len)) { | |
346 | while (dst > buf && *--dst != '/') | |
347 | ; /* nothing */ | |
348 | goto next; | |
349 | } | |
350 | ||
351 | memcpy(dst, comp_start, comp_len); | |
352 | dst += comp_len; | |
353 | next: | |
354 | comp_start = comp_end; | |
355 | } | |
356 | ||
357 | if (dst == buf) | |
358 | *dst++ = '/'; | |
359 | ||
360 | *dst = '\0'; | |
361 | return dst - buf; | |
362 | } | |
0454dd93 DR |
363 | |
364 | /* | |
365 | * path = Canonical absolute path | |
366 | * prefix_list = Colon-separated list of absolute paths | |
367 | * | |
2860b57a | 368 | * Determines, for each path in prefix_list, whether the "prefix" really |
0454dd93 DR |
369 | * is an ancestor directory of path. Returns the length of the longest |
370 | * ancestor directory, excluding any trailing slashes, or -1 if no prefix | |
371 | * is an ancestor. (Note that this means 0 is returned if prefix_list is | |
372 | * "/".) "/foo" is not considered an ancestor of "/foobar". Directories | |
373 | * are not considered to be their own ancestors. path must be in a | |
374 | * canonical form: empty components, or "." or ".." components are not | |
375 | * allowed. prefix_list may be null, which is like "". | |
376 | */ | |
377 | int longest_ancestor_length(const char *path, const char *prefix_list) | |
378 | { | |
379 | char buf[PATH_MAX+1]; | |
380 | const char *ceil, *colon; | |
381 | int len, max_len = -1; | |
382 | ||
383 | if (prefix_list == NULL || !strcmp(path, "/")) | |
384 | return -1; | |
385 | ||
386 | for (colon = ceil = prefix_list; *colon; ceil = colon+1) { | |
387 | for (colon = ceil; *colon && *colon != ':'; colon++); | |
388 | len = colon - ceil; | |
389 | if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil)) | |
390 | continue; | |
391 | strlcpy(buf, ceil, len+1); | |
392 | len = normalize_absolute_path(buf, buf); | |
393 | /* Strip "trailing slashes" from "/". */ | |
394 | if (len == 1) | |
395 | len = 0; | |
396 | ||
397 | if (!strncmp(path, buf, len) && | |
398 | path[len] == '/' && | |
399 | len > max_len) { | |
400 | max_len = len; | |
401 | } | |
402 | } | |
403 | ||
404 | return max_len; | |
405 | } |