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chromium / external / github.com / git / git / refs/tags/v2.1.1 / . / path.c
blob: 3afcdb432a009b5e1c869123139192cf1a688292 [file] [log] [blame]
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]1/*
Torsten Bögershausen3a429d32013-03-30 09:53:32[diff] [blame]2 * Utilities for paths and pathnames
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]3 */
4#include "cache.h"
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]5#include "strbuf.h"
Michael Haggertya5ccdbe2012-10-28 16:16:23[diff] [blame]6#include "string-list.h"
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]7
Ramsay Jonesf66450a2013-06-22 19:42:47[diff] [blame]8static int get_st_mode_bits(const char *path, int *mode)
Torsten Bögershausen0117c2f2013-03-23 12:40:29[diff] [blame]9{
10 struct stat st;
11 if (lstat(path, &st) < 0)
12 return -1;
13 *mode = st.st_mode;
14 return 0;
15}
Torsten Bögershausen0117c2f2013-03-23 12:40:29[diff] [blame]16
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]17static char bad_path[] = "/bad-path/";
18
Linus Torvaldse7676d22006-09-11 19:03:15[diff] [blame]19static char *get_pathname(void)
20{
21 static char pathname_array[4][PATH_MAX];
22 static int index;
23 return pathname_array[3 & ++index];
24}
25
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]26static char *cleanup_path(char *path)
27{
28 /* Clean it up */
29 if (!memcmp(path, "./", 2)) {
30 path += 2;
31 while (*path == '/')
32 path++;
33 }
34 return path;
35}
36
Alex Riesen108bebe2008-10-26 21:59:13[diff] [blame]37char *mksnpath(char *buf, size_t n, const char *fmt, ...)
38{
39 va_list args;
40 unsigned len;
41
42 va_start(args, fmt);
43 len = vsnprintf(buf, n, fmt, args);
44 va_end(args);
45 if (len >= n) {
Daniel Lowe9db56f72008-11-10 21:07:52[diff] [blame]46 strlcpy(buf, bad_path, n);
Alex Riesen108bebe2008-10-26 21:59:13[diff] [blame]47 return buf;
48 }
49 return cleanup_path(buf);
50}
51
Ramsay Jones5b3b8fa2012-09-04 17:26:30[diff] [blame]52static char *vsnpath(char *buf, size_t n, const char *fmt, va_list args)
Alex Riesenfe2d7772008-10-27 09:22:21[diff] [blame]53{
54 const char *git_dir = get_git_dir();
Alex Riesenfe2d7772008-10-27 09:22:21[diff] [blame]55 size_t len;
56
57 len = strlen(git_dir);
58 if (n < len + 1)
59 goto bad;
60 memcpy(buf, git_dir, len);
61 if (len && !is_dir_sep(git_dir[len-1]))
62 buf[len++] = '/';
Alex Riesenfe2d7772008-10-27 09:22:21[diff] [blame]63 len += vsnprintf(buf + len, n - len, fmt, args);
Alex Riesenfe2d7772008-10-27 09:22:21[diff] [blame]64 if (len >= n)
65 goto bad;
66 return cleanup_path(buf);
67bad:
Daniel Lowe9db56f72008-11-10 21:07:52[diff] [blame]68 strlcpy(buf, bad_path, n);
Alex Riesenfe2d7772008-10-27 09:22:21[diff] [blame]69 return buf;
70}
71
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]72char *git_snpath(char *buf, size_t n, const char *fmt, ...)
73{
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]74 char *ret;
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]75 va_list args;
76 va_start(args, fmt);
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]77 ret = vsnpath(buf, n, fmt, args);
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]78 va_end(args);
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]79 return ret;
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]80}
81
82char *git_pathdup(const char *fmt, ...)
83{
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]84 char path[PATH_MAX], *ret;
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]85 va_list args;
86 va_start(args, fmt);
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]87 ret = vsnpath(path, sizeof(path), fmt, args);
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]88 va_end(args);
Ramsay Jones66a51a92012-09-04 17:27:54[diff] [blame]89 return xstrdup(ret);
Alex Riesenaba13e72008-10-27 10:17:51[diff] [blame]90}
91
Huynh Khoi Nguyen Nguyen21cf3222012-06-22 09:03:23[diff] [blame]92char *mkpathdup(const char *fmt, ...)
93{
94 char *path;
95 struct strbuf sb = STRBUF_INIT;
96 va_list args;
97
98 va_start(args, fmt);
99 strbuf_vaddf(&sb, fmt, args);
100 va_end(args);
101 path = xstrdup(cleanup_path(sb.buf));
102
103 strbuf_release(&sb);
104 return path;
105}
106
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]107char *mkpath(const char *fmt, ...)
108{
109 va_list args;
110 unsigned len;
Linus Torvaldse7676d22006-09-11 19:03:15[diff] [blame]111 char *pathname = get_pathname();
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]112
113 va_start(args, fmt);
114 len = vsnprintf(pathname, PATH_MAX, fmt, args);
115 va_end(args);
116 if (len >= PATH_MAX)
117 return bad_path;
118 return cleanup_path(pathname);
119}
120
121char *git_path(const char *fmt, ...)
122{
Linus Torvaldse7676d22006-09-11 19:03:15[diff] [blame]123 char *pathname = get_pathname();
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]124 va_list args;
Ramsay Jones5c442522012-09-04 17:29:22[diff] [blame]125 char *ret;
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]126
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]127 va_start(args, fmt);
Ramsay Jones5c442522012-09-04 17:29:22[diff] [blame]128 ret = vsnpath(pathname, PATH_MAX, fmt, args);
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]129 va_end(args);
Ramsay Jones5c442522012-09-04 17:29:22[diff] [blame]130 return ret;
Linus Torvalds26c8a532005-07-08 23:20:59[diff] [blame]131}
Holger Eitzenbergerf2db68e2005-08-04 20:43:03[diff] [blame]132
Huynh Khoi Nguyen Nguyen21cf3222012-06-22 09:03:23[diff] [blame]133void home_config_paths(char **global, char **xdg, char *file)
134{
135 char *xdg_home = getenv("XDG_CONFIG_HOME");
136 char *home = getenv("HOME");
137 char *to_free = NULL;
138
139 if (!home) {
140 if (global)
141 *global = NULL;
142 } else {
143 if (!xdg_home) {
144 to_free = mkpathdup("%s/.config", home);
145 xdg_home = to_free;
146 }
147 if (global)
148 *global = mkpathdup("%s/.gitconfig", home);
149 }
150
151 if (!xdg_home)
152 *xdg = NULL;
153 else
154 *xdg = mkpathdup("%s/git/%s", xdg_home, file);
155
156 free(to_free);
157}
158
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]159char *git_path_submodule(const char *path, const char *fmt, ...)
160{
161 char *pathname = get_pathname();
162 struct strbuf buf = STRBUF_INIT;
163 const char *git_dir;
164 va_list args;
165 unsigned len;
166
167 len = strlen(path);
168 if (len > PATH_MAX-100)
169 return bad_path;
170
171 strbuf_addstr(&buf, path);
172 if (len && path[len-1] != '/')
173 strbuf_addch(&buf, '/');
174 strbuf_addstr(&buf, ".git");
175
Junio C Hamano13d6ec92011-08-22 21:04:56[diff] [blame]176 git_dir = read_gitfile(buf.buf);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]177 if (git_dir) {
178 strbuf_reset(&buf);
179 strbuf_addstr(&buf, git_dir);
180 }
181 strbuf_addch(&buf, '/');
182
183 if (buf.len >= PATH_MAX)
184 return bad_path;
185 memcpy(pathname, buf.buf, buf.len + 1);
186
187 strbuf_release(&buf);
188 len = strlen(pathname);
189
190 va_start(args, fmt);
191 len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
192 va_end(args);
193 if (len >= PATH_MAX)
194 return bad_path;
195 return cleanup_path(pathname);
196}
Holger Eitzenbergerf2db68e2005-08-04 20:43:03[diff] [blame]197
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]198int validate_headref(const char *path)
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]199{
200 struct stat st;
201 char *buf, buffer[256];
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]202 unsigned char sha1[20];
Heikki Orsila0104ca02008-04-27 18:21:58[diff] [blame]203 int fd;
204 ssize_t len;
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]205
206 if (lstat(path, &st) < 0)
207 return -1;
208
209 /* Make sure it is a "refs/.." symlink */
210 if (S_ISLNK(st.st_mode)) {
211 len = readlink(path, buffer, sizeof(buffer)-1);
Junio C Hamano222b1672009-02-12 21:02:09[diff] [blame]212 if (len >= 5 && !memcmp("refs/", buffer, 5))
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]213 return 0;
214 return -1;
215 }
216
217 /*
218 * Anything else, just open it and try to see if it is a symbolic ref.
219 */
220 fd = open(path, O_RDONLY);
221 if (fd < 0)
222 return -1;
Andy Whitcroft93d26e42007-01-08 15:58:08[diff] [blame]223 len = read_in_full(fd, buffer, sizeof(buffer)-1);
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]224 close(fd);
225
226 /*
227 * Is it a symbolic ref?
228 */
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]229 if (len < 4)
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]230 return -1;
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]231 if (!memcmp("ref:", buffer, 4)) {
232 buf = buffer + 4;
233 len -= 4;
234 while (len && isspace(*buf))
235 buf++, len--;
Junio C Hamano222b1672009-02-12 21:02:09[diff] [blame]236 if (len >= 5 && !memcmp("refs/", buf, 5))
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]237 return 0;
238 }
239
240 /*
241 * Is this a detached HEAD?
242 */
243 if (!get_sha1_hex(buffer, sha1))
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]244 return 0;
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]245
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]246 return -1;
247}
248
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]249static struct passwd *getpw_str(const char *username, size_t len)
Andreas Ericsson54f4b872005-11-17 19:37:14[diff] [blame]250{
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]251 struct passwd *pw;
René Scharfe5c0b13f2014-07-19 15:35:34[diff] [blame]252 char *username_z = xmemdupz(username, len);
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]253 pw = getpwnam(username_z);
254 free(username_z);
255 return pw;
256}
Andreas Ericsson54f4b872005-11-17 19:37:14[diff] [blame]257
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]258/*
259 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
260 * then it is a newly allocated string. Returns NULL on getpw failure or
261 * if path is NULL.
262 */
263char *expand_user_path(const char *path)
264{
265 struct strbuf user_path = STRBUF_INIT;
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]266 const char *to_copy = path;
267
268 if (path == NULL)
269 goto return_null;
270 if (path[0] == '~') {
Jeff King53ec5512014-01-28 01:36:12[diff] [blame]271 const char *first_slash = strchrnul(path, '/');
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]272 const char *username = path + 1;
273 size_t username_len = first_slash - username;
Matthieu Moydf2a79f2009-11-19 15:21:15[diff] [blame]274 if (username_len == 0) {
275 const char *home = getenv("HOME");
Jonathan Nieder79bf1492010-07-26 15:06:51[diff] [blame]276 if (!home)
277 goto return_null;
René Scharfecedc61a2014-07-16 23:38:18[diff] [blame]278 strbuf_addstr(&user_path, home);
Matthieu Moydf2a79f2009-11-19 15:21:15[diff] [blame]279 } else {
280 struct passwd *pw = getpw_str(username, username_len);
281 if (!pw)
282 goto return_null;
René Scharfecedc61a2014-07-16 23:38:18[diff] [blame]283 strbuf_addstr(&user_path, pw->pw_dir);
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]284 }
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]285 to_copy = first_slash;
Junio C Hamano0870ca72005-11-18 22:59:34[diff] [blame]286 }
René Scharfecedc61a2014-07-16 23:38:18[diff] [blame]287 strbuf_addstr(&user_path, to_copy);
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]288 return strbuf_detach(&user_path, NULL);
289return_null:
290 strbuf_release(&user_path);
291 return NULL;
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]292}
Andreas Ericsson54f4b872005-11-17 19:37:14[diff] [blame]293
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]294/*
295 * First, one directory to try is determined by the following algorithm.
296 *
297 * (0) If "strict" is given, the path is used as given and no DWIM is
298 * done. Otherwise:
299 * (1) "~/path" to mean path under the running user's home directory;
300 * (2) "~user/path" to mean path under named user's home directory;
301 * (3) "relative/path" to mean cwd relative directory; or
302 * (4) "/absolute/path" to mean absolute directory.
303 *
304 * Unless "strict" is given, we try access() for existence of "%s.git/.git",
305 * "%s/.git", "%s.git", "%s" in this order. The first one that exists is
306 * what we try.
307 *
308 * Second, we try chdir() to that. Upon failure, we return NULL.
309 *
310 * Then, we try if the current directory is a valid git repository.
311 * Upon failure, we return NULL.
312 *
313 * If all goes well, we return the directory we used to chdir() (but
314 * before ~user is expanded), avoiding getcwd() resolving symbolic
315 * links. User relative paths are also returned as they are given,
316 * except DWIM suffixing.
317 */
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]318const char *enter_repo(const char *path, int strict)
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]319{
320 static char used_path[PATH_MAX];
321 static char validated_path[PATH_MAX];
322
323 if (!path)
324 return NULL;
325
326 if (!strict) {
327 static const char *suffix[] = {
Jeff Kingb3256eb2012-02-02 21:59:13[diff] [blame]328 "/.git", "", ".git/.git", ".git", NULL,
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]329 };
Phil Hord03106762011-10-04 20:05:17[diff] [blame]330 const char *gitfile;
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]331 int len = strlen(path);
332 int i;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]333 while ((1 < len) && (path[len-1] == '/'))
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]334 len--;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]335
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]336 if (PATH_MAX <= len)
337 return NULL;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]338 strncpy(used_path, path, len); used_path[len] = 0 ;
339 strcpy(validated_path, used_path);
340
341 if (used_path[0] == '~') {
342 char *newpath = expand_user_path(used_path);
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]343 if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
344 free(newpath);
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]345 return NULL;
Matthieu Moy395de252009-11-17 17:24:25[diff] [blame]346 }
347 /*
348 * Copy back into the static buffer. A pity
349 * since newpath was not bounded, but other
350 * branches of the if are limited by PATH_MAX
351 * anyway.
352 */
353 strcpy(used_path, newpath); free(newpath);
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]354 }
355 else if (PATH_MAX - 10 < len)
356 return NULL;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]357 len = strlen(used_path);
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]358 for (i = 0; suffix[i]; i++) {
Jeff Kingb3256eb2012-02-02 21:59:13[diff] [blame]359 struct stat st;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]360 strcpy(used_path + len, suffix[i]);
Jeff Kingb3256eb2012-02-02 21:59:13[diff] [blame]361 if (!stat(used_path, &st) &&
362 (S_ISREG(st.st_mode) ||
363 (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) {
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]364 strcat(validated_path, suffix[i]);
365 break;
366 }
367 }
Phil Hord03106762011-10-04 20:05:17[diff] [blame]368 if (!suffix[i])
369 return NULL;
370 gitfile = read_gitfile(used_path) ;
371 if (gitfile)
372 strcpy(used_path, gitfile);
373 if (chdir(used_path))
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]374 return NULL;
375 path = validated_path;
376 }
377 else if (chdir(path))
378 return NULL;
379
380 if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
Junio C Hamanoc847f532007-01-02 07:31:08[diff] [blame]381 validate_headref("HEAD") == 0) {
René Scharfe717c3972010-02-06 09:35:19[diff] [blame]382 set_git_dir(".");
Junio C Hamano16441622005-11-25 18:48:26[diff] [blame]383 check_repository_format();
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]384 return path;
Andreas Ericsson54f4b872005-11-17 19:37:14[diff] [blame]385 }
386
387 return NULL;
388}
Junio C Hamano138086a2006-06-10 05:07:23[diff] [blame]389
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]390static int calc_shared_perm(int mode)
Junio C Hamano138086a2006-06-10 05:07:23[diff] [blame]391{
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]392 int tweak;
Junio C Hamano138086a2006-06-10 05:07:23[diff] [blame]393
Junio C Hamano5a688fe2009-03-25 23:19:36[diff] [blame]394 if (shared_repository < 0)
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]395 tweak = -shared_repository;
Junio C Hamano5a688fe2009-03-25 23:19:36[diff] [blame]396 else
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]397 tweak = shared_repository;
Junio C Hamano94df2502006-06-10 06:09:49[diff] [blame]398
Junio C Hamano5a688fe2009-03-25 23:19:36[diff] [blame]399 if (!(mode & S_IWUSR))
400 tweak &= ~0222;
401 if (mode & S_IXUSR)
402 /* Copy read bits to execute bits */
403 tweak |= (tweak & 0444) >> 2;
404 if (shared_repository < 0)
405 mode = (mode & ~0777) | tweak;
406 else
Petr Baudis8c6202d2008-07-12 01:15:03[diff] [blame]407 mode |= tweak;
Junio C Hamano94df2502006-06-10 06:09:49[diff] [blame]408
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]409 return mode;
410}
411
412
413int adjust_shared_perm(const char *path)
414{
415 int old_mode, new_mode;
416
417 if (!shared_repository)
418 return 0;
419 if (get_st_mode_bits(path, &old_mode) < 0)
420 return -1;
421
422 new_mode = calc_shared_perm(old_mode);
423 if (S_ISDIR(old_mode)) {
Heikki Orsila06cbe852008-04-16 08:34:24[diff] [blame]424 /* Copy read bits to execute bits */
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]425 new_mode |= (new_mode & 0444) >> 2;
426 new_mode |= FORCE_DIR_SET_GID;
Heikki Orsila06cbe852008-04-16 08:34:24[diff] [blame]427 }
428
Torsten Bögershausencbe43b82013-03-30 09:53:47[diff] [blame]429 if (((old_mode ^ new_mode) & ~S_IFMT) &&
430 chmod(path, (new_mode & ~S_IFMT)) < 0)
Junio C Hamano138086a2006-06-10 05:07:23[diff] [blame]431 return -2;
432 return 0;
433}
Johannes Schindeline5392c52007-08-01 00:28:59[diff] [blame]434
Jiang Xin7fbd4222013-10-14 02:29:39[diff] [blame]435static int have_same_root(const char *path1, const char *path2)
436{
437 int is_abs1, is_abs2;
438
439 is_abs1 = is_absolute_path(path1);
440 is_abs2 = is_absolute_path(path2);
441 return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) ||
442 (!is_abs1 && !is_abs2);
443}
444
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]445/*
446 * Give path as relative to prefix.
447 *
448 * The strbuf may or may not be used, so do not assume it contains the
449 * returned path.
450 */
451const char *relative_path(const char *in, const char *prefix,
452 struct strbuf *sb)
Linus Torvalds044bbbc2008-06-19 19:34:06[diff] [blame]453{
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]454 int in_len = in ? strlen(in) : 0;
455 int prefix_len = prefix ? strlen(prefix) : 0;
456 int in_off = 0;
457 int prefix_off = 0;
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]458 int i = 0, j = 0;
459
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]460 if (!in_len)
461 return "./";
462 else if (!prefix_len)
463 return in;
464
Jiang Xin7fbd4222013-10-14 02:29:39[diff] [blame]465 if (have_same_root(in, prefix)) {
466 /* bypass dos_drive, for "c:" is identical to "C:" */
467 if (has_dos_drive_prefix(in)) {
468 i = 2;
469 j = 2;
470 }
471 } else {
472 return in;
473 }
474
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]475 while (i < prefix_len && j < in_len && prefix[i] == in[j]) {
476 if (is_dir_sep(prefix[i])) {
477 while (is_dir_sep(prefix[i]))
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]478 i++;
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]479 while (is_dir_sep(in[j]))
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]480 j++;
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]481 prefix_off = i;
482 in_off = j;
483 } else {
484 i++;
485 j++;
486 }
487 }
488
489 if (
490 /* "prefix" seems like prefix of "in" */
491 i >= prefix_len &&
492 /*
493 * but "/foo" is not a prefix of "/foobar"
494 * (i.e. prefix not end with '/')
495 */
496 prefix_off < prefix_len) {
497 if (j >= in_len) {
498 /* in="/a/b", prefix="/a/b" */
499 in_off = in_len;
500 } else if (is_dir_sep(in[j])) {
501 /* in="/a/b/c", prefix="/a/b" */
502 while (is_dir_sep(in[j]))
503 j++;
504 in_off = j;
505 } else {
506 /* in="/a/bbb/c", prefix="/a/b" */
507 i = prefix_off;
508 }
509 } else if (
510 /* "in" is short than "prefix" */
511 j >= in_len &&
512 /* "in" not end with '/' */
513 in_off < in_len) {
514 if (is_dir_sep(prefix[i])) {
515 /* in="/a/b", prefix="/a/b/c/" */
516 while (is_dir_sep(prefix[i]))
517 i++;
518 in_off = in_len;
519 }
520 }
521 in += in_off;
522 in_len -= in_off;
523
524 if (i >= prefix_len) {
525 if (!in_len)
526 return "./";
527 else
528 return in;
529 }
530
531 strbuf_reset(sb);
532 strbuf_grow(sb, in_len);
533
534 while (i < prefix_len) {
535 if (is_dir_sep(prefix[i])) {
536 strbuf_addstr(sb, "../");
537 while (is_dir_sep(prefix[i]))
538 i++;
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]539 continue;
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]540 }
541 i++;
Junio C Hamano288123f2010-01-22 03:05:19[diff] [blame]542 }
Jiang Xine02ca722013-06-25 15:53:43[diff] [blame]543 if (!is_dir_sep(prefix[prefix_len - 1]))
544 strbuf_addstr(sb, "../");
545
546 strbuf_addstr(sb, in);
547
548 return sb->buf;
Linus Torvalds044bbbc2008-06-19 19:34:06[diff] [blame]549}
David Reissae299be2008-05-20 06:48:54[diff] [blame]550
551/*
Jiang Xin41894ae2013-10-14 02:29:40[diff] [blame]552 * A simpler implementation of relative_path
553 *
554 * Get relative path by removing "prefix" from "in". This function
555 * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
556 * to increase performance when traversing the path to work_tree.
557 */
558const char *remove_leading_path(const char *in, const char *prefix)
559{
560 static char buf[PATH_MAX + 1];
561 int i = 0, j = 0;
562
563 if (!prefix || !prefix[0])
564 return in;
565 while (prefix[i]) {
566 if (is_dir_sep(prefix[i])) {
567 if (!is_dir_sep(in[j]))
568 return in;
569 while (is_dir_sep(prefix[i]))
570 i++;
571 while (is_dir_sep(in[j]))
572 j++;
573 continue;
574 } else if (in[j] != prefix[i]) {
575 return in;
576 }
577 i++;
578 j++;
579 }
580 if (
581 /* "/foo" is a prefix of "/foo" */
582 in[j] &&
583 /* "/foo" is not a prefix of "/foobar" */
584 !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j])
585 )
586 return in;
587 while (is_dir_sep(in[j]))
588 j++;
589 if (!in[j])
590 strcpy(buf, ".");
591 else
592 strcpy(buf, in + j);
593 return buf;
594}
595
596/*
Johannes Sixtf2a782b2009-02-07 15:08:31[diff] [blame]597 * It is okay if dst == src, but they should not overlap otherwise.
David Reissae299be2008-05-20 06:48:54[diff] [blame]598 *
Johannes Sixtf2a782b2009-02-07 15:08:31[diff] [blame]599 * Performs the following normalizations on src, storing the result in dst:
600 * - Ensures that components are separated by '/' (Windows only)
601 * - Squashes sequences of '/'.
David Reissae299be2008-05-20 06:48:54[diff] [blame]602 * - Removes "." components.
603 * - Removes ".." components, and the components the precede them.
Johannes Sixtf2a782b2009-02-07 15:08:31[diff] [blame]604 * Returns failure (non-zero) if a ".." component appears as first path
605 * component anytime during the normalization. Otherwise, returns success (0).
David Reissae299be2008-05-20 06:48:54[diff] [blame]606 *
607 * Note that this function is purely textual. It does not follow symlinks,
608 * verify the existence of the path, or make any system calls.
Nguyễn Thái Ngọc Duy645a29c2013-07-14 08:36:03[diff] [blame]609 *
610 * prefix_len != NULL is for a specific case of prefix_pathspec():
611 * assume that src == dst and src[0..prefix_len-1] is already
612 * normalized, any time "../" eats up to the prefix_len part,
613 * prefix_len is reduced. In the end prefix_len is the remaining
614 * prefix that has not been overridden by user pathspec.
David Reissae299be2008-05-20 06:48:54[diff] [blame]615 */
Nguyễn Thái Ngọc Duy645a29c2013-07-14 08:36:03[diff] [blame]616int normalize_path_copy_len(char *dst, const char *src, int *prefix_len)
David Reissae299be2008-05-20 06:48:54[diff] [blame]617{
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]618 char *dst0;
David Reissae299be2008-05-20 06:48:54[diff] [blame]619
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]620 if (has_dos_drive_prefix(src)) {
621 *dst++ = *src++;
622 *dst++ = *src++;
623 }
624 dst0 = dst;
David Reissae299be2008-05-20 06:48:54[diff] [blame]625
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]626 if (is_dir_sep(*src)) {
627 *dst++ = '/';
628 while (is_dir_sep(*src))
629 src++;
David Reissae299be2008-05-20 06:48:54[diff] [blame]630 }
631
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]632 for (;;) {
633 char c = *src;
David Reissae299be2008-05-20 06:48:54[diff] [blame]634
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]635 /*
636 * A path component that begins with . could be
637 * special:
638 * (1) "." and ends -- ignore and terminate.
639 * (2) "./" -- ignore them, eat slash and continue.
640 * (3) ".." and ends -- strip one and terminate.
641 * (4) "../" -- strip one, eat slash and continue.
642 */
643 if (c == '.') {
644 if (!src[1]) {
645 /* (1) */
646 src++;
647 } else if (is_dir_sep(src[1])) {
648 /* (2) */
649 src += 2;
650 while (is_dir_sep(*src))
651 src++;
652 continue;
653 } else if (src[1] == '.') {
654 if (!src[2]) {
655 /* (3) */
656 src += 2;
657 goto up_one;
658 } else if (is_dir_sep(src[2])) {
659 /* (4) */
660 src += 3;
661 while (is_dir_sep(*src))
662 src++;
663 goto up_one;
664 }
665 }
666 }
667
668 /* copy up to the next '/', and eat all '/' */
669 while ((c = *src++) != '\0' && !is_dir_sep(c))
670 *dst++ = c;
671 if (is_dir_sep(c)) {
672 *dst++ = '/';
673 while (is_dir_sep(c))
674 c = *src++;
675 src--;
676 } else if (!c)
677 break;
678 continue;
679
680 up_one:
681 /*
682 * dst0..dst is prefix portion, and dst[-1] is '/';
683 * go up one level.
684 */
Johannes Sixtf42302b2009-02-07 15:08:30[diff] [blame]685 dst--; /* go to trailing '/' */
686 if (dst <= dst0)
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]687 return -1;
Johannes Sixtf42302b2009-02-07 15:08:30[diff] [blame]688 /* Windows: dst[-1] cannot be backslash anymore */
689 while (dst0 < dst && dst[-1] != '/')
690 dst--;
Nguyễn Thái Ngọc Duy645a29c2013-07-14 08:36:03[diff] [blame]691 if (prefix_len && *prefix_len > dst - dst0)
692 *prefix_len = dst - dst0;
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]693 }
David Reissae299be2008-05-20 06:48:54[diff] [blame]694 *dst = '\0';
Johannes Sixtf3cad0a2009-02-07 15:08:28[diff] [blame]695 return 0;
David Reissae299be2008-05-20 06:48:54[diff] [blame]696}
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]697
Nguyễn Thái Ngọc Duy645a29c2013-07-14 08:36:03[diff] [blame]698int normalize_path_copy(char *dst, const char *src)
699{
700 return normalize_path_copy_len(dst, src, NULL);
701}
702
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]703/*
704 * path = Canonical absolute path
Michael Haggerty9e2326c2012-10-28 16:16:25[diff] [blame]705 * prefixes = string_list containing normalized, absolute paths without
706 * trailing slashes (except for the root directory, which is denoted by "/").
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]707 *
Michael Haggerty9e2326c2012-10-28 16:16:25[diff] [blame]708 * Determines, for each path in prefixes, whether the "prefix"
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]709 * is an ancestor directory of path. Returns the length of the longest
710 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
Michael Haggerty31171d92012-10-28 16:16:24[diff] [blame]711 * is an ancestor. (Note that this means 0 is returned if prefixes is
712 * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]713 * are not considered to be their own ancestors. path must be in a
714 * canonical form: empty components, or "." or ".." components are not
Michael Haggerty9e2326c2012-10-28 16:16:25[diff] [blame]715 * allowed.
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]716 */
Michael Haggerty31171d92012-10-28 16:16:24[diff] [blame]717int longest_ancestor_length(const char *path, struct string_list *prefixes)
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]718{
Michael Haggertya5ccdbe2012-10-28 16:16:23[diff] [blame]719 int i, max_len = -1;
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]720
Michael Haggerty31171d92012-10-28 16:16:24[diff] [blame]721 if (!strcmp(path, "/"))
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]722 return -1;
723
Michael Haggerty31171d92012-10-28 16:16:24[diff] [blame]724 for (i = 0; i < prefixes->nr; i++) {
725 const char *ceil = prefixes->items[i].string;
Michael Haggertya5ccdbe2012-10-28 16:16:23[diff] [blame]726 int len = strlen(ceil);
727
Michael Haggerty9e2326c2012-10-28 16:16:25[diff] [blame]728 if (len == 1 && ceil[0] == '/')
729 len = 0; /* root matches anything, with length 0 */
730 else if (!strncmp(path, ceil, len) && path[len] == '/')
731 ; /* match of length len */
732 else
733 continue; /* no match */
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]734
Michael Haggerty9e2326c2012-10-28 16:16:25[diff] [blame]735 if (len > max_len)
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]736 max_len = len;
David Reiss0454dd92008-05-20 06:49:26[diff] [blame]737 }
738
739 return max_len;
740}
Johannes Schindelin4fcc86b2009-02-19 19:10:49[diff] [blame]741
742/* strip arbitrary amount of directory separators at end of path */
743static inline int chomp_trailing_dir_sep(const char *path, int len)
744{
745 while (len && is_dir_sep(path[len - 1]))
746 len--;
747 return len;
748}
749
750/*
751 * If path ends with suffix (complete path components), returns the
752 * part before suffix (sans trailing directory separators).
753 * Otherwise returns NULL.
754 */
755char *strip_path_suffix(const char *path, const char *suffix)
756{
757 int path_len = strlen(path), suffix_len = strlen(suffix);
758
759 while (suffix_len) {
760 if (!path_len)
761 return NULL;
762
763 if (is_dir_sep(path[path_len - 1])) {
764 if (!is_dir_sep(suffix[suffix_len - 1]))
765 return NULL;
766 path_len = chomp_trailing_dir_sep(path, path_len);
767 suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
768 }
769 else if (path[--path_len] != suffix[--suffix_len])
770 return NULL;
771 }
772
773 if (path_len && !is_dir_sep(path[path_len - 1]))
774 return NULL;
775 return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
776}
Shawn O. Pearce34b6cb82009-11-09 19:26:43[diff] [blame]777
778int daemon_avoid_alias(const char *p)
779{
780 int sl, ndot;
781
782 /*
783 * This resurrects the belts and suspenders paranoia check by HPA
784 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
Junio C Hamano9517e6b2010-02-04 05:23:18[diff] [blame]785 * does not do getcwd() based path canonicalization.
Shawn O. Pearce34b6cb82009-11-09 19:26:43[diff] [blame]786 *
787 * sl becomes true immediately after seeing '/' and continues to
788 * be true as long as dots continue after that without intervening
789 * non-dot character.
790 */
791 if (!p || (*p != '/' && *p != '~'))
792 return -1;
793 sl = 1; ndot = 0;
794 p++;
795
796 while (1) {
797 char ch = *p++;
798 if (sl) {
799 if (ch == '.')
800 ndot++;
801 else if (ch == '/') {
802 if (ndot < 3)
803 /* reject //, /./ and /../ */
804 return -1;
805 ndot = 0;
806 }
807 else if (ch == 0) {
808 if (0 < ndot && ndot < 3)
809 /* reject /.$ and /..$ */
810 return -1;
811 return 0;
812 }
813 else
814 sl = ndot = 0;
815 }
816 else if (ch == 0)
817 return 0;
818 else if (ch == '/') {
819 sl = 1;
820 ndot = 0;
821 }
822 }
823}