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