diff: make sure work tree side is shown as 0{40} when different
[git/git.git] / path.c
CommitLineData
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
15static char bad_path[] = "/bad-path/";
16
e7676d2f
LT
17static 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
24static 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
35char *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
49char *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 */
72int 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 89int 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 139static 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
202char *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
259int 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
295const 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);
314 } else
315 last_elem = xstrdup(buf);
316 }
317
318 if (*buf) {
319 if (!*cwd && !getcwd(cwd, sizeof(cwd)))
320 die ("Could not get current working directory");
321
322 if (chdir(buf))
323 die ("Could not switch to '%s'", buf);
324 }
325 if (!getcwd(buf, PATH_MAX))
326 die ("Could not get current working directory");
327
328 if (last_elem) {
329 int len = strlen(buf);
330 if (len + strlen(last_elem) + 2 > PATH_MAX)
331 die ("Too long path name: '%s/%s'",
332 buf, last_elem);
333 buf[len] = '/';
334 strcpy(buf + len + 1, last_elem);
335 free(last_elem);
336 last_elem = NULL;
337 }
338
339 if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
340 len = readlink(buf, next_buf, PATH_MAX);
341 if (len < 0)
342 die ("Invalid symlink: %s", buf);
343 next_buf[len] = '\0';
344 buf = next_buf;
345 buf_index = 1 - buf_index;
346 next_buf = bufs[buf_index];
347 } else
348 break;
349 }
350
351 if (*cwd && chdir(cwd))
352 die ("Could not change back to '%s'", cwd);
353
354 return buf;
355}