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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010-2012 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <linux/magic.h> | |
24 | #include <sys/statvfs.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "dirent-util.h" | |
28 | #include "fd-util.h" | |
29 | #include "macro.h" | |
30 | #include "missing.h" | |
31 | #include "stat-util.h" | |
32 | #include "string-util.h" | |
33 | ||
34 | int is_symlink(const char *path) { | |
35 | struct stat info; | |
36 | ||
37 | assert(path); | |
38 | ||
39 | if (lstat(path, &info) < 0) | |
40 | return -errno; | |
41 | ||
42 | return !!S_ISLNK(info.st_mode); | |
43 | } | |
44 | ||
45 | int is_dir(const char* path, bool follow) { | |
46 | struct stat st; | |
47 | int r; | |
48 | ||
49 | assert(path); | |
50 | ||
51 | if (follow) | |
52 | r = stat(path, &st); | |
53 | else | |
54 | r = lstat(path, &st); | |
55 | if (r < 0) | |
56 | return -errno; | |
57 | ||
58 | return !!S_ISDIR(st.st_mode); | |
59 | } | |
60 | ||
61 | int is_device_node(const char *path) { | |
62 | struct stat info; | |
63 | ||
64 | assert(path); | |
65 | ||
66 | if (lstat(path, &info) < 0) | |
67 | return -errno; | |
68 | ||
69 | return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode)); | |
70 | } | |
71 | ||
72 | int dir_is_empty(const char *path) { | |
73 | _cleanup_closedir_ DIR *d; | |
74 | struct dirent *de; | |
75 | ||
76 | d = opendir(path); | |
77 | if (!d) | |
78 | return -errno; | |
79 | ||
80 | FOREACH_DIRENT(de, d, return -errno) | |
81 | return 0; | |
82 | ||
83 | return 1; | |
84 | } | |
85 | ||
86 | bool null_or_empty(struct stat *st) { | |
87 | assert(st); | |
88 | ||
89 | if (S_ISREG(st->st_mode) && st->st_size <= 0) | |
90 | return true; | |
91 | ||
92 | /* We don't want to hardcode the major/minor of /dev/null, | |
93 | * hence we do a simpler "is this a device node?" check. */ | |
94 | ||
95 | if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) | |
96 | return true; | |
97 | ||
98 | return false; | |
99 | } | |
100 | ||
101 | int null_or_empty_path(const char *fn) { | |
102 | struct stat st; | |
103 | ||
104 | assert(fn); | |
105 | ||
106 | if (stat(fn, &st) < 0) | |
107 | return -errno; | |
108 | ||
109 | return null_or_empty(&st); | |
110 | } | |
111 | ||
112 | int null_or_empty_fd(int fd) { | |
113 | struct stat st; | |
114 | ||
115 | assert(fd >= 0); | |
116 | ||
117 | if (fstat(fd, &st) < 0) | |
118 | return -errno; | |
119 | ||
120 | return null_or_empty(&st); | |
121 | } | |
122 | ||
123 | int path_is_read_only_fs(const char *path) { | |
124 | struct statvfs st; | |
125 | ||
126 | assert(path); | |
127 | ||
128 | if (statvfs(path, &st) < 0) | |
129 | return -errno; | |
130 | ||
131 | if (st.f_flag & ST_RDONLY) | |
132 | return true; | |
133 | ||
134 | /* On NFS, statvfs() might not reflect whether we can actually | |
135 | * write to the remote share. Let's try again with | |
136 | * access(W_OK) which is more reliable, at least sometimes. */ | |
137 | if (access(path, W_OK) < 0 && errno == EROFS) | |
138 | return true; | |
139 | ||
140 | return false; | |
141 | } | |
142 | ||
143 | int path_is_os_tree(const char *path) { | |
144 | char *p; | |
145 | int r; | |
146 | ||
147 | assert(path); | |
148 | ||
149 | /* We use /usr/lib/os-release as flag file if something is an OS */ | |
150 | p = strjoina(path, "/usr/lib/os-release"); | |
151 | r = access(p, F_OK); | |
152 | if (r >= 0) | |
153 | return 1; | |
154 | ||
155 | /* Also check for the old location in /etc, just in case. */ | |
156 | p = strjoina(path, "/etc/os-release"); | |
157 | r = access(p, F_OK); | |
158 | ||
159 | return r >= 0; | |
160 | } | |
161 | ||
162 | int files_same(const char *filea, const char *fileb) { | |
163 | struct stat a, b; | |
164 | ||
165 | assert(filea); | |
166 | assert(fileb); | |
167 | ||
168 | if (stat(filea, &a) < 0) | |
169 | return -errno; | |
170 | ||
171 | if (stat(fileb, &b) < 0) | |
172 | return -errno; | |
173 | ||
174 | return a.st_dev == b.st_dev && | |
175 | a.st_ino == b.st_ino; | |
176 | } | |
177 | ||
178 | bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) { | |
179 | assert(s); | |
180 | assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type)); | |
181 | ||
182 | return F_TYPE_EQUAL(s->f_type, magic_value); | |
183 | } | |
184 | ||
185 | int fd_check_fstype(int fd, statfs_f_type_t magic_value) { | |
186 | struct statfs s; | |
187 | ||
188 | if (fstatfs(fd, &s) < 0) | |
189 | return -errno; | |
190 | ||
191 | return is_fs_type(&s, magic_value); | |
192 | } | |
193 | ||
194 | int path_check_fstype(const char *path, statfs_f_type_t magic_value) { | |
195 | _cleanup_close_ int fd = -1; | |
196 | ||
197 | fd = open(path, O_RDONLY); | |
198 | if (fd < 0) | |
199 | return -errno; | |
200 | ||
201 | return fd_check_fstype(fd, magic_value); | |
202 | } | |
203 | ||
204 | bool is_temporary_fs(const struct statfs *s) { | |
205 | return is_fs_type(s, TMPFS_MAGIC) || | |
206 | is_fs_type(s, RAMFS_MAGIC); | |
207 | } | |
208 | ||
209 | int fd_is_temporary_fs(int fd) { | |
210 | struct statfs s; | |
211 | ||
212 | if (fstatfs(fd, &s) < 0) | |
213 | return -errno; | |
214 | ||
215 | return is_temporary_fs(&s); | |
216 | } |