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8fcde012 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010-2012 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 TA |
20 | #include <dirent.h> |
21 | #include <errno.h> | |
8fcde012 | 22 | #include <fcntl.h> |
11c3a366 TA |
23 | #include <sys/stat.h> |
24 | #include <sys/types.h> | |
8fcde012 LP |
25 | #include <linux/magic.h> |
26 | #include <sys/statvfs.h> | |
27 | #include <unistd.h> | |
28 | ||
29 | #include "dirent-util.h" | |
30 | #include "fd-util.h" | |
31 | #include "macro.h" | |
32 | #include "missing.h" | |
33 | #include "stat-util.h" | |
34 | #include "string-util.h" | |
35 | ||
36 | int is_symlink(const char *path) { | |
37 | struct stat info; | |
38 | ||
39 | assert(path); | |
40 | ||
41 | if (lstat(path, &info) < 0) | |
42 | return -errno; | |
43 | ||
44 | return !!S_ISLNK(info.st_mode); | |
45 | } | |
46 | ||
47 | int is_dir(const char* path, bool follow) { | |
48 | struct stat st; | |
49 | int r; | |
50 | ||
51 | assert(path); | |
52 | ||
53 | if (follow) | |
54 | r = stat(path, &st); | |
55 | else | |
56 | r = lstat(path, &st); | |
57 | if (r < 0) | |
58 | return -errno; | |
59 | ||
60 | return !!S_ISDIR(st.st_mode); | |
61 | } | |
62 | ||
63 | int is_device_node(const char *path) { | |
64 | struct stat info; | |
65 | ||
66 | assert(path); | |
67 | ||
68 | if (lstat(path, &info) < 0) | |
69 | return -errno; | |
70 | ||
71 | return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode)); | |
72 | } | |
73 | ||
74 | int dir_is_empty(const char *path) { | |
75 | _cleanup_closedir_ DIR *d; | |
76 | struct dirent *de; | |
77 | ||
78 | d = opendir(path); | |
79 | if (!d) | |
80 | return -errno; | |
81 | ||
82 | FOREACH_DIRENT(de, d, return -errno) | |
83 | return 0; | |
84 | ||
85 | return 1; | |
86 | } | |
87 | ||
88 | bool null_or_empty(struct stat *st) { | |
89 | assert(st); | |
90 | ||
91 | if (S_ISREG(st->st_mode) && st->st_size <= 0) | |
92 | return true; | |
93 | ||
94 | /* We don't want to hardcode the major/minor of /dev/null, | |
95 | * hence we do a simpler "is this a device node?" check. */ | |
96 | ||
97 | if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) | |
98 | return true; | |
99 | ||
100 | return false; | |
101 | } | |
102 | ||
103 | int null_or_empty_path(const char *fn) { | |
104 | struct stat st; | |
105 | ||
106 | assert(fn); | |
107 | ||
108 | if (stat(fn, &st) < 0) | |
109 | return -errno; | |
110 | ||
111 | return null_or_empty(&st); | |
112 | } | |
113 | ||
114 | int null_or_empty_fd(int fd) { | |
115 | struct stat st; | |
116 | ||
117 | assert(fd >= 0); | |
118 | ||
119 | if (fstat(fd, &st) < 0) | |
120 | return -errno; | |
121 | ||
122 | return null_or_empty(&st); | |
123 | } | |
124 | ||
125 | int path_is_read_only_fs(const char *path) { | |
126 | struct statvfs st; | |
127 | ||
128 | assert(path); | |
129 | ||
130 | if (statvfs(path, &st) < 0) | |
131 | return -errno; | |
132 | ||
133 | if (st.f_flag & ST_RDONLY) | |
134 | return true; | |
135 | ||
136 | /* On NFS, statvfs() might not reflect whether we can actually | |
137 | * write to the remote share. Let's try again with | |
138 | * access(W_OK) which is more reliable, at least sometimes. */ | |
139 | if (access(path, W_OK) < 0 && errno == EROFS) | |
140 | return true; | |
141 | ||
142 | return false; | |
143 | } | |
144 | ||
145 | int path_is_os_tree(const char *path) { | |
146 | char *p; | |
147 | int r; | |
148 | ||
149 | assert(path); | |
150 | ||
151 | /* We use /usr/lib/os-release as flag file if something is an OS */ | |
152 | p = strjoina(path, "/usr/lib/os-release"); | |
153 | r = access(p, F_OK); | |
154 | if (r >= 0) | |
155 | return 1; | |
156 | ||
157 | /* Also check for the old location in /etc, just in case. */ | |
158 | p = strjoina(path, "/etc/os-release"); | |
159 | r = access(p, F_OK); | |
160 | ||
161 | return r >= 0; | |
162 | } | |
163 | ||
164 | int files_same(const char *filea, const char *fileb) { | |
165 | struct stat a, b; | |
166 | ||
167 | assert(filea); | |
168 | assert(fileb); | |
169 | ||
170 | if (stat(filea, &a) < 0) | |
171 | return -errno; | |
172 | ||
173 | if (stat(fileb, &b) < 0) | |
174 | return -errno; | |
175 | ||
176 | return a.st_dev == b.st_dev && | |
177 | a.st_ino == b.st_ino; | |
178 | } | |
179 | ||
180 | bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) { | |
181 | assert(s); | |
182 | assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type)); | |
183 | ||
184 | return F_TYPE_EQUAL(s->f_type, magic_value); | |
185 | } | |
186 | ||
187 | int fd_check_fstype(int fd, statfs_f_type_t magic_value) { | |
188 | struct statfs s; | |
189 | ||
190 | if (fstatfs(fd, &s) < 0) | |
191 | return -errno; | |
192 | ||
193 | return is_fs_type(&s, magic_value); | |
194 | } | |
195 | ||
196 | int path_check_fstype(const char *path, statfs_f_type_t magic_value) { | |
197 | _cleanup_close_ int fd = -1; | |
198 | ||
199 | fd = open(path, O_RDONLY); | |
200 | if (fd < 0) | |
201 | return -errno; | |
202 | ||
203 | return fd_check_fstype(fd, magic_value); | |
204 | } | |
205 | ||
206 | bool is_temporary_fs(const struct statfs *s) { | |
207 | return is_fs_type(s, TMPFS_MAGIC) || | |
208 | is_fs_type(s, RAMFS_MAGIC); | |
209 | } | |
210 | ||
211 | int fd_is_temporary_fs(int fd) { | |
212 | struct statfs s; | |
213 | ||
214 | if (fstatfs(fd, &s) < 0) | |
215 | return -errno; | |
216 | ||
217 | return is_temporary_fs(&s); | |
218 | } |