]>
Commit | Line | Data |
---|---|---|
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]; |
0870ca7f JH |
94 | int len, fd; |
95 | ||
96 | if (lstat(path, &st) < 0) | |
97 | return -1; | |
98 | ||
99 | /* Make sure it is a "refs/.." symlink */ | |
100 | if (S_ISLNK(st.st_mode)) { | |
101 | len = readlink(path, buffer, sizeof(buffer)-1); | |
102 | if (len >= 5 && !memcmp("refs/", buffer, 5)) | |
103 | return 0; | |
104 | return -1; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Anything else, just open it and try to see if it is a symbolic ref. | |
109 | */ | |
110 | fd = open(path, O_RDONLY); | |
111 | if (fd < 0) | |
112 | return -1; | |
93d26e4c | 113 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
0870ca7f JH |
114 | close(fd); |
115 | ||
116 | /* | |
117 | * Is it a symbolic ref? | |
118 | */ | |
c847f537 | 119 | if (len < 4) |
0870ca7f | 120 | return -1; |
c847f537 JH |
121 | if (!memcmp("ref:", buffer, 4)) { |
122 | buf = buffer + 4; | |
123 | len -= 4; | |
124 | while (len && isspace(*buf)) | |
125 | buf++, len--; | |
126 | if (len >= 5 && !memcmp("refs/", buf, 5)) | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Is this a detached HEAD? | |
132 | */ | |
133 | if (!get_sha1_hex(buffer, sha1)) | |
0870ca7f | 134 | return 0; |
c847f537 | 135 | |
0870ca7f JH |
136 | return -1; |
137 | } | |
138 | ||
d79374c7 | 139 | static char *user_path(char *buf, char *path, int sz) |
54f4b874 | 140 | { |
d79374c7 JH |
141 | struct passwd *pw; |
142 | char *slash; | |
143 | int len, baselen; | |
54f4b874 | 144 | |
d79374c7 JH |
145 | if (!path || path[0] != '~') |
146 | return NULL; | |
147 | path++; | |
148 | slash = strchr(path, '/'); | |
149 | if (path[0] == '/' || !path[0]) { | |
150 | pw = getpwuid(getuid()); | |
151 | } | |
152 | else { | |
153 | if (slash) { | |
154 | *slash = 0; | |
155 | pw = getpwnam(path); | |
156 | *slash = '/'; | |
54f4b874 | 157 | } |
d79374c7 JH |
158 | else |
159 | pw = getpwnam(path); | |
54f4b874 | 160 | } |
d79374c7 JH |
161 | if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir)) |
162 | return NULL; | |
163 | baselen = strlen(pw->pw_dir); | |
164 | memcpy(buf, pw->pw_dir, baselen); | |
165 | while ((1 < baselen) && (buf[baselen-1] == '/')) { | |
166 | buf[baselen-1] = 0; | |
167 | baselen--; | |
168 | } | |
169 | if (slash && slash[1]) { | |
170 | len = strlen(slash); | |
171 | if (sz <= baselen + len) | |
172 | return NULL; | |
173 | memcpy(buf + baselen, slash, len + 1); | |
174 | } | |
175 | return buf; | |
54f4b874 AE |
176 | } |
177 | ||
d79374c7 JH |
178 | /* |
179 | * First, one directory to try is determined by the following algorithm. | |
180 | * | |
181 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
182 | * done. Otherwise: | |
183 | * (1) "~/path" to mean path under the running user's home directory; | |
184 | * (2) "~user/path" to mean path under named user's home directory; | |
185 | * (3) "relative/path" to mean cwd relative directory; or | |
186 | * (4) "/absolute/path" to mean absolute directory. | |
187 | * | |
188 | * Unless "strict" is given, we try access() for existence of "%s.git/.git", | |
189 | * "%s/.git", "%s.git", "%s" in this order. The first one that exists is | |
190 | * what we try. | |
191 | * | |
192 | * Second, we try chdir() to that. Upon failure, we return NULL. | |
193 | * | |
194 | * Then, we try if the current directory is a valid git repository. | |
195 | * Upon failure, we return NULL. | |
196 | * | |
197 | * If all goes well, we return the directory we used to chdir() (but | |
198 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
199 | * links. User relative paths are also returned as they are given, | |
200 | * except DWIM suffixing. | |
201 | */ | |
54f4b874 AE |
202 | char *enter_repo(char *path, int strict) |
203 | { | |
d79374c7 JH |
204 | static char used_path[PATH_MAX]; |
205 | static char validated_path[PATH_MAX]; | |
206 | ||
207 | if (!path) | |
54f4b874 AE |
208 | return NULL; |
209 | ||
d79374c7 JH |
210 | if (!strict) { |
211 | static const char *suffix[] = { | |
212 | ".git/.git", "/.git", ".git", "", NULL, | |
213 | }; | |
214 | int len = strlen(path); | |
215 | int i; | |
216 | while ((1 < len) && (path[len-1] == '/')) { | |
217 | path[len-1] = 0; | |
218 | len--; | |
219 | } | |
220 | if (PATH_MAX <= len) | |
54f4b874 | 221 | return NULL; |
d79374c7 JH |
222 | if (path[0] == '~') { |
223 | if (!user_path(used_path, path, PATH_MAX)) | |
224 | return NULL; | |
225 | strcpy(validated_path, path); | |
226 | path = used_path; | |
227 | } | |
228 | else if (PATH_MAX - 10 < len) | |
229 | return NULL; | |
230 | else { | |
231 | path = strcpy(used_path, path); | |
232 | strcpy(validated_path, path); | |
233 | } | |
234 | len = strlen(path); | |
235 | for (i = 0; suffix[i]; i++) { | |
236 | strcpy(path + len, suffix[i]); | |
237 | if (!access(path, F_OK)) { | |
238 | strcat(validated_path, suffix[i]); | |
239 | break; | |
240 | } | |
241 | } | |
242 | if (!suffix[i] || chdir(path)) | |
0870ca7f | 243 | return NULL; |
d79374c7 | 244 | path = validated_path; |
0870ca7f | 245 | } |
d79374c7 JH |
246 | else if (chdir(path)) |
247 | return NULL; | |
54f4b874 | 248 | |
d79374c7 | 249 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && |
c847f537 | 250 | validate_headref("HEAD") == 0) { |
7627943a | 251 | setenv(GIT_DIR_ENVIRONMENT, ".", 1); |
1644162a | 252 | check_repository_format(); |
d79374c7 | 253 | return path; |
54f4b874 AE |
254 | } |
255 | ||
256 | return NULL; | |
257 | } | |
138086a7 JH |
258 | |
259 | int adjust_shared_perm(const char *path) | |
260 | { | |
261 | struct stat st; | |
262 | int mode; | |
263 | ||
264 | if (!shared_repository) | |
265 | return 0; | |
266 | if (lstat(path, &st) < 0) | |
267 | return -1; | |
268 | mode = st.st_mode; | |
269 | if (mode & S_IRUSR) | |
94df2506 JH |
270 | mode |= (shared_repository == PERM_GROUP |
271 | ? S_IRGRP | |
272 | : (shared_repository == PERM_EVERYBODY | |
273 | ? (S_IRGRP|S_IROTH) | |
274 | : 0)); | |
275 | ||
138086a7 JH |
276 | if (mode & S_IWUSR) |
277 | mode |= S_IWGRP; | |
94df2506 | 278 | |
138086a7 | 279 | if (mode & S_IXUSR) |
94df2506 JH |
280 | mode |= (shared_repository == PERM_GROUP |
281 | ? S_IXGRP | |
282 | : (shared_repository == PERM_EVERYBODY | |
283 | ? (S_IXGRP|S_IXOTH) | |
284 | : 0)); | |
138086a7 JH |
285 | if (S_ISDIR(mode)) |
286 | mode |= S_ISGID; | |
fe732ede | 287 | if ((mode & st.st_mode) != mode && chmod(path, mode) < 0) |
138086a7 JH |
288 | return -2; |
289 | return 0; | |
290 | } | |
e5392c51 JS |
291 | |
292 | /* We allow "recursive" symbolic links. Only within reason, though. */ | |
293 | #define MAXDEPTH 5 | |
294 | ||
295 | const char *make_absolute_path(const char *path) | |
296 | { | |
297 | static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; | |
298 | char cwd[1024] = ""; | |
299 | int buf_index = 1, len; | |
300 | ||
301 | int depth = MAXDEPTH; | |
302 | char *last_elem = NULL; | |
303 | struct stat st; | |
304 | ||
305 | if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) | |
306 | die ("Too long path: %.*s", 60, path); | |
307 | ||
308 | while (depth--) { | |
309 | if (stat(buf, &st) || !S_ISDIR(st.st_mode)) { | |
310 | char *last_slash = strrchr(buf, '/'); | |
311 | if (last_slash) { | |
312 | *last_slash = '\0'; | |
313 | last_elem = xstrdup(last_slash + 1); | |
e371a4c6 | 314 | } else { |
e5392c51 | 315 | last_elem = xstrdup(buf); |
e371a4c6 JS |
316 | *buf = '\0'; |
317 | } | |
e5392c51 JS |
318 | } |
319 | ||
320 | if (*buf) { | |
321 | if (!*cwd && !getcwd(cwd, sizeof(cwd))) | |
322 | die ("Could not get current working directory"); | |
323 | ||
324 | if (chdir(buf)) | |
325 | die ("Could not switch to '%s'", buf); | |
326 | } | |
327 | if (!getcwd(buf, PATH_MAX)) | |
328 | die ("Could not get current working directory"); | |
329 | ||
330 | if (last_elem) { | |
331 | int len = strlen(buf); | |
332 | if (len + strlen(last_elem) + 2 > PATH_MAX) | |
333 | die ("Too long path name: '%s/%s'", | |
334 | buf, last_elem); | |
335 | buf[len] = '/'; | |
336 | strcpy(buf + len + 1, last_elem); | |
337 | free(last_elem); | |
338 | last_elem = NULL; | |
339 | } | |
340 | ||
341 | if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { | |
342 | len = readlink(buf, next_buf, PATH_MAX); | |
343 | if (len < 0) | |
344 | die ("Invalid symlink: %s", buf); | |
345 | next_buf[len] = '\0'; | |
346 | buf = next_buf; | |
347 | buf_index = 1 - buf_index; | |
348 | next_buf = bufs[buf_index]; | |
349 | } else | |
350 | break; | |
351 | } | |
352 | ||
353 | if (*cwd && chdir(cwd)) | |
354 | die ("Could not change back to '%s'", cwd); | |
355 | ||
356 | return buf; | |
357 | } |