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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8fcde012 | 2 | /*** |
8fcde012 | 3 | Copyright 2010-2012 Lennart Poettering |
8fcde012 LP |
4 | ***/ |
5 | ||
11c3a366 TA |
6 | #include <dirent.h> |
7 | #include <errno.h> | |
8fcde012 LP |
8 | #include <fcntl.h> |
9 | #include <linux/magic.h> | |
dccca82b LP |
10 | #include <sched.h> |
11 | #include <sys/stat.h> | |
8fcde012 | 12 | #include <sys/statvfs.h> |
dccca82b | 13 | #include <sys/types.h> |
8fcde012 LP |
14 | #include <unistd.h> |
15 | ||
16 | #include "dirent-util.h" | |
17 | #include "fd-util.h" | |
7dcdb24e | 18 | #include "fs-util.h" |
8fcde012 LP |
19 | #include "macro.h" |
20 | #include "missing.h" | |
21 | #include "stat-util.h" | |
22 | #include "string-util.h" | |
23 | ||
24 | int is_symlink(const char *path) { | |
25 | struct stat info; | |
26 | ||
27 | assert(path); | |
28 | ||
29 | if (lstat(path, &info) < 0) | |
30 | return -errno; | |
31 | ||
32 | return !!S_ISLNK(info.st_mode); | |
33 | } | |
34 | ||
35 | int is_dir(const char* path, bool follow) { | |
36 | struct stat st; | |
37 | int r; | |
38 | ||
39 | assert(path); | |
40 | ||
41 | if (follow) | |
42 | r = stat(path, &st); | |
43 | else | |
44 | r = lstat(path, &st); | |
45 | if (r < 0) | |
46 | return -errno; | |
47 | ||
48 | return !!S_ISDIR(st.st_mode); | |
49 | } | |
50 | ||
51 | int is_device_node(const char *path) { | |
52 | struct stat info; | |
53 | ||
54 | assert(path); | |
55 | ||
56 | if (lstat(path, &info) < 0) | |
57 | return -errno; | |
58 | ||
59 | return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode)); | |
60 | } | |
61 | ||
62 | int dir_is_empty(const char *path) { | |
63 | _cleanup_closedir_ DIR *d; | |
64 | struct dirent *de; | |
65 | ||
66 | d = opendir(path); | |
67 | if (!d) | |
68 | return -errno; | |
69 | ||
70 | FOREACH_DIRENT(de, d, return -errno) | |
71 | return 0; | |
72 | ||
73 | return 1; | |
74 | } | |
75 | ||
76 | bool null_or_empty(struct stat *st) { | |
77 | assert(st); | |
78 | ||
79 | if (S_ISREG(st->st_mode) && st->st_size <= 0) | |
80 | return true; | |
81 | ||
82 | /* We don't want to hardcode the major/minor of /dev/null, | |
83 | * hence we do a simpler "is this a device node?" check. */ | |
84 | ||
85 | if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) | |
86 | return true; | |
87 | ||
88 | return false; | |
89 | } | |
90 | ||
91 | int null_or_empty_path(const char *fn) { | |
92 | struct stat st; | |
93 | ||
94 | assert(fn); | |
95 | ||
96 | if (stat(fn, &st) < 0) | |
97 | return -errno; | |
98 | ||
99 | return null_or_empty(&st); | |
100 | } | |
101 | ||
102 | int null_or_empty_fd(int fd) { | |
103 | struct stat st; | |
104 | ||
105 | assert(fd >= 0); | |
106 | ||
107 | if (fstat(fd, &st) < 0) | |
108 | return -errno; | |
109 | ||
110 | return null_or_empty(&st); | |
111 | } | |
112 | ||
113 | int path_is_read_only_fs(const char *path) { | |
114 | struct statvfs st; | |
115 | ||
116 | assert(path); | |
117 | ||
118 | if (statvfs(path, &st) < 0) | |
119 | return -errno; | |
120 | ||
121 | if (st.f_flag & ST_RDONLY) | |
122 | return true; | |
123 | ||
124 | /* On NFS, statvfs() might not reflect whether we can actually | |
125 | * write to the remote share. Let's try again with | |
126 | * access(W_OK) which is more reliable, at least sometimes. */ | |
127 | if (access(path, W_OK) < 0 && errno == EROFS) | |
128 | return true; | |
129 | ||
130 | return false; | |
131 | } | |
132 | ||
e3f791a2 | 133 | int files_same(const char *filea, const char *fileb, int flags) { |
8fcde012 LP |
134 | struct stat a, b; |
135 | ||
136 | assert(filea); | |
137 | assert(fileb); | |
138 | ||
e3f791a2 | 139 | if (fstatat(AT_FDCWD, filea, &a, flags) < 0) |
8fcde012 LP |
140 | return -errno; |
141 | ||
e3f791a2 | 142 | if (fstatat(AT_FDCWD, fileb, &b, flags) < 0) |
8fcde012 LP |
143 | return -errno; |
144 | ||
145 | return a.st_dev == b.st_dev && | |
146 | a.st_ino == b.st_ino; | |
147 | } | |
148 | ||
149 | bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) { | |
150 | assert(s); | |
151 | assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type)); | |
152 | ||
153 | return F_TYPE_EQUAL(s->f_type, magic_value); | |
154 | } | |
155 | ||
a66fee2e | 156 | int fd_is_fs_type(int fd, statfs_f_type_t magic_value) { |
8fcde012 LP |
157 | struct statfs s; |
158 | ||
159 | if (fstatfs(fd, &s) < 0) | |
160 | return -errno; | |
161 | ||
162 | return is_fs_type(&s, magic_value); | |
163 | } | |
164 | ||
40fd52f2 | 165 | int path_is_fs_type(const char *path, statfs_f_type_t magic_value) { |
8fcde012 LP |
166 | _cleanup_close_ int fd = -1; |
167 | ||
436e916e | 168 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH); |
8fcde012 LP |
169 | if (fd < 0) |
170 | return -errno; | |
171 | ||
a66fee2e | 172 | return fd_is_fs_type(fd, magic_value); |
8fcde012 LP |
173 | } |
174 | ||
175 | bool is_temporary_fs(const struct statfs *s) { | |
77f9fa3b LP |
176 | return is_fs_type(s, TMPFS_MAGIC) || |
177 | is_fs_type(s, RAMFS_MAGIC); | |
178 | } | |
179 | ||
180 | bool is_network_fs(const struct statfs *s) { | |
181 | return is_fs_type(s, CIFS_MAGIC_NUMBER) || | |
182 | is_fs_type(s, CODA_SUPER_MAGIC) || | |
183 | is_fs_type(s, NCP_SUPER_MAGIC) || | |
184 | is_fs_type(s, NFS_SUPER_MAGIC) || | |
185 | is_fs_type(s, SMB_SUPER_MAGIC) || | |
186 | is_fs_type(s, V9FS_MAGIC) || | |
187 | is_fs_type(s, AFS_SUPER_MAGIC) || | |
188 | is_fs_type(s, OCFS2_SUPER_MAGIC); | |
8fcde012 LP |
189 | } |
190 | ||
191 | int fd_is_temporary_fs(int fd) { | |
192 | struct statfs s; | |
193 | ||
194 | if (fstatfs(fd, &s) < 0) | |
195 | return -errno; | |
196 | ||
197 | return is_temporary_fs(&s); | |
198 | } | |
ffeb8285 | 199 | |
77f9fa3b LP |
200 | int fd_is_network_fs(int fd) { |
201 | struct statfs s; | |
202 | ||
203 | if (fstatfs(fd, &s) < 0) | |
204 | return -errno; | |
205 | ||
206 | return is_network_fs(&s); | |
207 | } | |
208 | ||
d7bea6b6 DP |
209 | int fd_is_network_ns(int fd) { |
210 | int r; | |
211 | ||
212 | r = fd_is_fs_type(fd, NSFS_MAGIC); | |
213 | if (r <= 0) | |
214 | return r; | |
77f9fa3b | 215 | |
29f74559 LP |
216 | r = ioctl(fd, NS_GET_NSTYPE); |
217 | if (r < 0) | |
d7bea6b6 | 218 | return -errno; |
77f9fa3b | 219 | |
d7bea6b6 DP |
220 | return r == CLONE_NEWNET; |
221 | } | |
222 | ||
ffeb8285 LP |
223 | int path_is_temporary_fs(const char *path) { |
224 | _cleanup_close_ int fd = -1; | |
225 | ||
436e916e | 226 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH); |
ffeb8285 LP |
227 | if (fd < 0) |
228 | return -errno; | |
229 | ||
230 | return fd_is_temporary_fs(fd); | |
231 | } | |
3cc44114 LP |
232 | |
233 | int stat_verify_regular(const struct stat *st) { | |
234 | assert(st); | |
235 | ||
236 | /* Checks whether the specified stat() structure refers to a regular file. If not returns an appropriate error | |
237 | * code. */ | |
238 | ||
239 | if (S_ISDIR(st->st_mode)) | |
240 | return -EISDIR; | |
241 | ||
242 | if (S_ISLNK(st->st_mode)) | |
243 | return -ELOOP; | |
244 | ||
245 | if (!S_ISREG(st->st_mode)) | |
246 | return -EBADFD; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | int fd_verify_regular(int fd) { | |
252 | struct stat st; | |
253 | ||
254 | assert(fd >= 0); | |
255 | ||
256 | if (fstat(fd, &st) < 0) | |
257 | return -errno; | |
258 | ||
259 | return stat_verify_regular(&st); | |
260 | } |