1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010-2012 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
31 #include <sys/statvfs.h>
37 #include "path-util.h"
40 bool path_is_absolute(const char *p) {
44 bool is_path(const char *p) {
45 return !!strchr(p, '/');
48 char *path_get_file_name(const char *p) {
53 if ((r = strrchr(p, '/')))
59 int path_get_parent(const char *path, char **_r) {
60 const char *e, *a = NULL, *b = NULL, *p;
70 for (e = path; *e; e++) {
72 if (!slash && *e == '/') {
76 } else if (slash && *e != '/')
91 r = strndup(path, p-path);
100 char **path_split_and_make_absolute(const char *p) {
104 if (!(l = strv_split(p, ":")))
107 if (!path_strv_make_absolute_cwd(l)) {
115 char *path_make_absolute(const char *p, const char *prefix) {
118 /* Makes every item in the list an absolute path by prepending
119 * the prefix, if specified and necessary */
121 if (path_is_absolute(p) || !prefix)
124 return strjoin(prefix, "/", p, NULL);
127 char *path_make_absolute_cwd(const char *p) {
132 /* Similar to path_make_absolute(), but prefixes with the
133 * current working directory. */
135 if (path_is_absolute(p))
138 cwd = get_current_dir_name();
142 r = path_make_absolute(p, cwd);
148 char **path_strv_make_absolute_cwd(char **l) {
151 /* Goes through every item in the string list and makes it
152 * absolute. This works in place and won't rollback any
153 * changes on failure. */
158 if (!(t = path_make_absolute_cwd(*s)))
168 char **path_strv_canonicalize(char **l) {
176 /* Goes through every item in the string list and canonicalize
177 * the path. This works in place and won't rollback any
178 * changes on failure. */
183 t = path_make_absolute_cwd(*s);
193 u = canonicalize_file_name(t);
199 if (errno == ENOMEM || !errno)
218 char *path_kill_slashes(char *path) {
222 /* Removes redundant inner and trailing slashes. Modifies the
223 * passed string in-place.
225 * ///foo///bar/ becomes /foo/bar
228 for (f = path, t = path; *f; f++) {
243 /* Special rule, if we are talking of the root directory, a
244 trailing slash is good */
246 if (t == path && slash)
253 char* path_startswith(const char *path, const char *prefix) {
257 if ((path[0] == '/') != (prefix[0] == '/'))
263 path += strspn(path, "/");
264 prefix += strspn(prefix, "/");
272 a = strcspn(path, "/");
273 b = strcspn(prefix, "/");
278 if (memcmp(path, prefix, a) != 0)
286 bool path_equal(const char *a, const char *b) {
290 if ((a[0] == '/') != (b[0] == '/'))
299 if (*a == 0 && *b == 0)
302 if (*a == 0 || *b == 0)
311 if (memcmp(a, b, j) != 0)
319 int path_is_mount_point(const char *t, bool allow_symlink) {
322 struct file_handle *h;
323 int mount_id, mount_id_parent;
326 /* We are not actually interested in the file handles, but
327 * name_to_handle_at() also passes us the mount ID, hence use
328 * it but throw the handle away */
330 if (path_equal(t, "/"))
333 h = alloca(MAX_HANDLE_SZ);
334 h->handle_bytes = MAX_HANDLE_SZ;
336 r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
338 if (errno == ENOSYS || errno == ENOTSUP)
339 /* This kernel or file system does not support
340 * name_to_handle_at(), hence fallback to the
341 * traditional stat() logic */
350 r = path_get_parent(t, &parent);
354 h->handle_bytes = MAX_HANDLE_SZ;
355 r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
359 /* The parent can't do name_to_handle_at() but the
360 * directory we are interested in can? If so, it must
361 * be a mount point */
362 if (errno == ENOTSUP)
368 return mount_id != mount_id_parent;
383 r = path_get_parent(t, &parent);
387 r = lstat(parent, &b);
393 return a.st_dev != b.st_dev;
396 int path_is_read_only_fs(const char *path) {
401 if (statvfs(path, &st) < 0)
404 return !!(st.f_flag & ST_RDONLY);