1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010-2012 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
26 #include <linux/magic.h>
27 #include <sys/statvfs.h>
30 #include "dirent-util.h"
35 #include "stat-util.h"
36 #include "string-util.h"
38 #if 0 /// UNNEEDED by elogind
39 int is_symlink(const char *path) {
44 if (lstat(path, &info) < 0)
47 return !!S_ISLNK(info.st_mode);
51 int is_dir(const char* path, bool follow) {
64 return !!S_ISDIR(st.st_mode);
67 #if 0 /// UNNEEDED by elogind
68 int is_device_node(const char *path) {
73 if (lstat(path, &info) < 0)
76 return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode));
79 int dir_is_empty(const char *path) {
80 _cleanup_closedir_ DIR *d;
87 FOREACH_DIRENT(de, d, return -errno)
94 bool null_or_empty(struct stat *st) {
97 if (S_ISREG(st->st_mode) && st->st_size <= 0)
100 /* We don't want to hardcode the major/minor of /dev/null,
101 * hence we do a simpler "is this a device node?" check. */
103 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
109 int null_or_empty_path(const char *fn) {
114 if (stat(fn, &st) < 0)
117 return null_or_empty(&st);
120 #if 0 /// UNNEEDED by elogind
121 int null_or_empty_fd(int fd) {
126 if (fstat(fd, &st) < 0)
129 return null_or_empty(&st);
133 int path_is_read_only_fs(const char *path) {
138 if (statvfs(path, &st) < 0)
141 if (st.f_flag & ST_RDONLY)
144 /* On NFS, statvfs() might not reflect whether we can actually
145 * write to the remote share. Let's try again with
146 * access(W_OK) which is more reliable, at least sometimes. */
147 if (access(path, W_OK) < 0 && errno == EROFS)
153 #if 0 /// UNNEEDED by elogind
154 int path_is_os_tree(const char *path) {
159 /* Does the path exist at all? If not, generate an error immediately. This is useful so that a missing root dir
160 * always results in -ENOENT, and we can properly distuingish the case where the whole root doesn't exist from
161 * the case where just the os-release file is missing. */
162 if (laccess(path, F_OK) < 0)
165 /* We use /usr/lib/os-release as flag file if something is an OS */
166 r = chase_symlinks("/usr/lib/os-release", path, CHASE_PREFIX_ROOT, NULL);
169 /* Also check for the old location in /etc, just in case. */
170 r = chase_symlinks("/etc/os-release", path, CHASE_PREFIX_ROOT, NULL);
172 return 0; /* We got nothing */
181 int files_same(const char *filea, const char *fileb, int flags) {
187 if (fstatat(AT_FDCWD, filea, &a, flags) < 0)
190 if (fstatat(AT_FDCWD, fileb, &b, flags) < 0)
193 return a.st_dev == b.st_dev &&
194 a.st_ino == b.st_ino;
197 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
199 assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));
201 return F_TYPE_EQUAL(s->f_type, magic_value);
204 int fd_is_fs_type(int fd, statfs_f_type_t magic_value) {
207 if (fstatfs(fd, &s) < 0)
210 return is_fs_type(&s, magic_value);
213 #if 0 /// UNNEEDED by elogind
214 int path_is_fs_type(const char *path, statfs_f_type_t magic_value) {
215 _cleanup_close_ int fd = -1;
217 fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH);
221 return fd_is_fs_type(fd, magic_value);
225 bool is_temporary_fs(const struct statfs *s) {
226 return is_fs_type(s, TMPFS_MAGIC) ||
227 is_fs_type(s, RAMFS_MAGIC);
230 #if 0 /// UNNEEDED by elogind
231 int fd_is_temporary_fs(int fd) {
234 if (fstatfs(fd, &s) < 0)
237 return is_temporary_fs(&s);
240 int fd_is_network_ns(int fd) {
243 r = fd_is_fs_type(fd, NSFS_MAGIC);
246 r = ioctl(fd, NS_GET_NSTYPE);
249 return r == CLONE_NEWNET;
252 int path_is_temporary_fs(const char *path) {
253 _cleanup_close_ int fd = -1;
255 fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH);
259 return fd_is_temporary_fs(fd);