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3577de7a KS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Kay Sievers | |
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 <errno.h> | |
3577de7a | 23 | #include <stdlib.h> |
07630cea | 24 | #include <sys/stat.h> |
3577de7a KS |
25 | #include <unistd.h> |
26 | ||
3577de7a KS |
27 | #include "log.h" |
28 | #include "macro.h" | |
07630cea | 29 | #include "string-util.h" |
3577de7a | 30 | #include "util.h" |
07630cea | 31 | #include "base-filesystem.h" |
3ffd4af2 | 32 | #include "fd-util.h" |
3577de7a KS |
33 | |
34 | typedef struct BaseFilesystem { | |
35 | const char *dir; | |
36 | mode_t mode; | |
37 | const char *target; | |
3fd165e5 | 38 | const char *exists; |
6404ecc8 | 39 | bool ignore_failure; |
3577de7a KS |
40 | } BaseFilesystem; |
41 | ||
42 | static const BaseFilesystem table[] = { | |
30d7c9c4 HH |
43 | { "bin", 0, "usr/bin\0", NULL }, |
44 | { "lib", 0, "usr/lib\0", NULL }, | |
6404ecc8 | 45 | { "root", 0755, NULL, NULL, true }, |
30d7c9c4 | 46 | { "sbin", 0, "usr/sbin\0", NULL }, |
03cfe0d5 LP |
47 | { "usr", 0755, NULL, NULL }, |
48 | { "var", 0755, NULL, NULL }, | |
49 | { "etc", 0755, NULL, NULL }, | |
e1ae9755 | 50 | #if defined(__i386__) || defined(__x86_64__) |
30d7c9c4 HH |
51 | { "lib64", 0, "usr/lib/x86_64-linux-gnu\0" |
52 | "usr/lib64\0", "ld-linux-x86-64.so.2" }, | |
e1ae9755 | 53 | #endif |
3577de7a KS |
54 | }; |
55 | ||
03cfe0d5 | 56 | int base_filesystem_create(const char *root, uid_t uid, gid_t gid) { |
3577de7a KS |
57 | _cleanup_close_ int fd = -1; |
58 | unsigned i; | |
a7f7d1bd | 59 | int r = 0; |
3577de7a KS |
60 | |
61 | fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); | |
4a62c710 MS |
62 | if (fd < 0) |
63 | return log_error_errno(errno, "Failed to open root file system: %m"); | |
3577de7a KS |
64 | |
65 | for (i = 0; i < ELEMENTSOF(table); i ++) { | |
6f4f8056 HH |
66 | if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0) |
67 | continue; | |
68 | ||
3577de7a | 69 | if (table[i].target) { |
6dc2852c | 70 | const char *target = NULL, *s; |
e1ae9755 KS |
71 | |
72 | /* check if one of the targets exists */ | |
73 | NULSTR_FOREACH(s, table[i].target) { | |
74 | if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
75 | continue; | |
76 | ||
3fd165e5 KS |
77 | /* check if a specific file exists at the target path */ |
78 | if (table[i].exists) { | |
79 | _cleanup_free_ char *p = NULL; | |
80 | ||
81 | p = strjoin(s, "/", table[i].exists, NULL); | |
82 | if (!p) | |
83 | return log_oom(); | |
84 | ||
85 | if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
86 | continue; | |
87 | } | |
88 | ||
e1ae9755 KS |
89 | target = s; |
90 | break; | |
91 | } | |
92 | ||
93 | if (!target) | |
3577de7a KS |
94 | continue; |
95 | ||
e1ae9755 | 96 | r = symlinkat(target, fd, table[i].dir); |
4a62c710 MS |
97 | if (r < 0 && errno != EEXIST) |
98 | return log_error_errno(errno, "Failed to create symlink at %s/%s: %m", root, table[i].dir); | |
03cfe0d5 LP |
99 | |
100 | if (uid != UID_INVALID || gid != UID_INVALID) { | |
101 | if (fchownat(fd, table[i].dir, uid, gid, AT_SYMLINK_NOFOLLOW) < 0) | |
102 | return log_error_errno(errno, "Failed to chown symlink at %s/%s: %m", root, table[i].dir); | |
103 | } | |
104 | ||
3577de7a KS |
105 | continue; |
106 | } | |
107 | ||
108 | RUN_WITH_UMASK(0000) | |
109 | r = mkdirat(fd, table[i].dir, table[i].mode); | |
6404ecc8 LP |
110 | if (r < 0 && errno != EEXIST) { |
111 | log_full_errno(table[i].ignore_failure ? LOG_DEBUG : LOG_ERR, errno, | |
112 | "Failed to create directory at %s/%s: %m", root, table[i].dir); | |
113 | ||
114 | if (!table[i].ignore_failure) | |
115 | return -errno; | |
116 | } | |
03cfe0d5 LP |
117 | |
118 | if (uid != UID_INVALID || gid != UID_INVALID) { | |
119 | if (fchownat(fd, table[i].dir, uid, gid, AT_SYMLINK_NOFOLLOW) < 0) | |
120 | return log_error_errno(errno, "Failed to chown directory at %s/%s: %m", root, table[i].dir); | |
121 | } | |
3577de7a KS |
122 | } |
123 | ||
124 | return 0; | |
125 | } |