1 /***
2 This file is part of eudev, forked from systemd.
3
4 Copyright 2010 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
20 #include <assert.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <errno.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26
27 #include "label.h"
28 #include "util.h"
29 #include "path-util.h"
30 #include "mkdir.h"
31
mkdir_safe_internal(const char * path,mode_t mode,uid_t uid,gid_t gid,mkdir_func_t _mkdir)32 int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, mkdir_func_t _mkdir) {
33 struct stat st;
34
35 if (_mkdir(path, mode) >= 0)
36 if (chmod_and_chown(path, mode, uid, gid) < 0)
37 return -errno;
38
39 if (lstat(path, &st) < 0)
40 return -errno;
41
42 if ((st.st_mode & 0007) > (mode & 0007) ||
43 (st.st_mode & 0070) > (mode & 0070) ||
44 (st.st_mode & 0700) > (mode & 0700) ||
45 (uid != UID_INVALID && st.st_uid != uid) ||
46 (gid != GID_INVALID && st.st_gid != gid) ||
47 !S_ISDIR(st.st_mode))
48 return -EEXIST;
49
50 return 0;
51 }
52
mkdir_parents_internal(const char * prefix,const char * path,mode_t mode,mkdir_func_t _mkdir)53 int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
54 const char *p, *e;
55 int r;
56
57 assert(path);
58
59 if (prefix && !path_startswith(path, prefix))
60 return -ENOTDIR;
61
62 /* return immediately if directory exists */
63 e = strrchr(path, '/');
64 if (!e)
65 return -EINVAL;
66
67 if (e == path)
68 return 0;
69
70 char buf[PATH_MAX + 1];
71 p = buf;
72 assert(e-path < sizeof(buf));
73 memcpy(buf, path, e-path);
74 buf[e-path] = 0;
75
76 r = is_dir(p, true);
77 if (r > 0)
78 return 0;
79 if (r == 0)
80 return -ENOTDIR;
81
82 /* create every parent directory in the path, except the last component */
83 p = path + strspn(path, "/");
84 for (;;) {
85 char t[strlen(path) + 1];
86
87 e = p + strcspn(p, "/");
88 p = e + strspn(e, "/");
89
90 /* Is this the last component? If so, then we're
91 * done */
92 if (*p == 0)
93 return 0;
94
95 memcpy(t, path, e - path);
96 t[e-path] = 0;
97
98 if (prefix && path_startswith(prefix, t))
99 continue;
100
101 r = _mkdir(t, mode);
102 if (r < 0 && errno != EEXIST)
103 return -errno;
104 }
105 }
106
mkdir_parents(const char * path,mode_t mode)107 int mkdir_parents(const char *path, mode_t mode) {
108 return mkdir_parents_internal(NULL, path, mode, mkdir);
109 }
110
mkdir_p_internal(const char * prefix,const char * path,mode_t mode,mkdir_func_t _mkdir)111 int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
112 int r;
113
114 /* Like mkdir -p */
115
116 r = mkdir_parents_internal(prefix, path, mode, _mkdir);
117 if (r < 0)
118 return r;
119
120 r = _mkdir(path, mode);
121 if (r < 0 && (errno != EEXIST || is_dir(path, true) <= 0))
122 return -errno;
123
124 return 0;
125 }
126
udev_mkdir_p(const char * path,mode_t mode)127 int udev_mkdir_p(const char *path, mode_t mode) {
128 return mkdir_p_internal(NULL, path, mode, mkdir);
129 }
130