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3577de7a KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Kay Sievers | |
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 <errno.h> | |
a8fbdf54 TA |
21 | #include <fcntl.h> |
22 | #include <stdbool.h> | |
3577de7a | 23 | #include <stdlib.h> |
07630cea | 24 | #include <sys/stat.h> |
a8fbdf54 | 25 | #include <syslog.h> |
3577de7a KS |
26 | #include <unistd.h> |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
affb60b1 LP |
29 | #include "base-filesystem.h" |
30 | #include "fd-util.h" | |
3577de7a KS |
31 | #include "log.h" |
32 | #include "macro.h" | |
07630cea | 33 | #include "string-util.h" |
affb60b1 | 34 | #include "umask-util.h" |
ee104e11 | 35 | #include "user-util.h" |
3577de7a | 36 | #include "util.h" |
3577de7a KS |
37 | |
38 | typedef struct BaseFilesystem { | |
39 | const char *dir; | |
40 | mode_t mode; | |
41 | const char *target; | |
3fd165e5 | 42 | const char *exists; |
6404ecc8 | 43 | bool ignore_failure; |
3577de7a KS |
44 | } BaseFilesystem; |
45 | ||
46 | static const BaseFilesystem table[] = { | |
30d7c9c4 HH |
47 | { "bin", 0, "usr/bin\0", NULL }, |
48 | { "lib", 0, "usr/lib\0", NULL }, | |
6404ecc8 | 49 | { "root", 0755, NULL, NULL, true }, |
30d7c9c4 | 50 | { "sbin", 0, "usr/sbin\0", NULL }, |
03cfe0d5 LP |
51 | { "usr", 0755, NULL, NULL }, |
52 | { "var", 0755, NULL, NULL }, | |
53 | { "etc", 0755, NULL, NULL }, | |
e1ae9755 | 54 | #if defined(__i386__) || defined(__x86_64__) |
30d7c9c4 HH |
55 | { "lib64", 0, "usr/lib/x86_64-linux-gnu\0" |
56 | "usr/lib64\0", "ld-linux-x86-64.so.2" }, | |
e1ae9755 | 57 | #endif |
3577de7a KS |
58 | }; |
59 | ||
03cfe0d5 | 60 | int base_filesystem_create(const char *root, uid_t uid, gid_t gid) { |
3577de7a KS |
61 | _cleanup_close_ int fd = -1; |
62 | unsigned i; | |
a7f7d1bd | 63 | int r = 0; |
3577de7a KS |
64 | |
65 | fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); | |
4a62c710 MS |
66 | if (fd < 0) |
67 | return log_error_errno(errno, "Failed to open root file system: %m"); | |
3577de7a KS |
68 | |
69 | for (i = 0; i < ELEMENTSOF(table); i ++) { | |
6f4f8056 HH |
70 | if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0) |
71 | continue; | |
72 | ||
3577de7a | 73 | if (table[i].target) { |
6dc2852c | 74 | const char *target = NULL, *s; |
e1ae9755 KS |
75 | |
76 | /* check if one of the targets exists */ | |
77 | NULSTR_FOREACH(s, table[i].target) { | |
78 | if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
79 | continue; | |
80 | ||
3fd165e5 KS |
81 | /* check if a specific file exists at the target path */ |
82 | if (table[i].exists) { | |
83 | _cleanup_free_ char *p = NULL; | |
84 | ||
605405c6 | 85 | p = strjoin(s, "/", table[i].exists); |
3fd165e5 KS |
86 | if (!p) |
87 | return log_oom(); | |
88 | ||
89 | if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
90 | continue; | |
91 | } | |
92 | ||
e1ae9755 KS |
93 | target = s; |
94 | break; | |
95 | } | |
96 | ||
97 | if (!target) | |
3577de7a KS |
98 | continue; |
99 | ||
e1ae9755 | 100 | r = symlinkat(target, fd, table[i].dir); |
4a62c710 MS |
101 | if (r < 0 && errno != EEXIST) |
102 | return log_error_errno(errno, "Failed to create symlink at %s/%s: %m", root, table[i].dir); | |
03cfe0d5 LP |
103 | |
104 | if (uid != UID_INVALID || gid != UID_INVALID) { | |
105 | if (fchownat(fd, table[i].dir, uid, gid, AT_SYMLINK_NOFOLLOW) < 0) | |
106 | return log_error_errno(errno, "Failed to chown symlink at %s/%s: %m", root, table[i].dir); | |
107 | } | |
108 | ||
3577de7a KS |
109 | continue; |
110 | } | |
111 | ||
112 | RUN_WITH_UMASK(0000) | |
113 | r = mkdirat(fd, table[i].dir, table[i].mode); | |
6404ecc8 LP |
114 | if (r < 0 && errno != EEXIST) { |
115 | log_full_errno(table[i].ignore_failure ? LOG_DEBUG : LOG_ERR, errno, | |
116 | "Failed to create directory at %s/%s: %m", root, table[i].dir); | |
117 | ||
118 | if (!table[i].ignore_failure) | |
119 | return -errno; | |
120 | } | |
03cfe0d5 LP |
121 | |
122 | if (uid != UID_INVALID || gid != UID_INVALID) { | |
123 | if (fchownat(fd, table[i].dir, uid, gid, AT_SYMLINK_NOFOLLOW) < 0) | |
124 | return log_error_errno(errno, "Failed to chown directory at %s/%s: %m", root, table[i].dir); | |
125 | } | |
3577de7a KS |
126 | } |
127 | ||
128 | return 0; | |
129 | } |