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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> | |
23 | #include <sys/stat.h> | |
24 | #include <stdlib.h> | |
3577de7a KS |
25 | #include <unistd.h> |
26 | ||
27 | #include "base-filesystem.h" | |
28 | #include "log.h" | |
29 | #include "macro.h" | |
30 | #include "util.h" | |
3577de7a KS |
31 | |
32 | typedef struct BaseFilesystem { | |
33 | const char *dir; | |
34 | mode_t mode; | |
35 | const char *target; | |
3fd165e5 | 36 | const char *exists; |
3577de7a KS |
37 | } BaseFilesystem; |
38 | ||
39 | static const BaseFilesystem table[] = { | |
30d7c9c4 HH |
40 | { "bin", 0, "usr/bin\0", NULL }, |
41 | { "lib", 0, "usr/lib\0", NULL }, | |
42 | { "root", 0755, NULL, NULL }, | |
43 | { "sbin", 0, "usr/sbin\0", NULL }, | |
e1ae9755 | 44 | #if defined(__i386__) || defined(__x86_64__) |
30d7c9c4 HH |
45 | { "lib64", 0, "usr/lib/x86_64-linux-gnu\0" |
46 | "usr/lib64\0", "ld-linux-x86-64.so.2" }, | |
e1ae9755 | 47 | #endif |
3577de7a KS |
48 | }; |
49 | ||
50 | int base_filesystem_create(const char *root) { | |
51 | _cleanup_close_ int fd = -1; | |
52 | unsigned i; | |
a7f7d1bd | 53 | int r = 0; |
3577de7a KS |
54 | |
55 | fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); | |
4a62c710 MS |
56 | if (fd < 0) |
57 | return log_error_errno(errno, "Failed to open root file system: %m"); | |
3577de7a KS |
58 | |
59 | for (i = 0; i < ELEMENTSOF(table); i ++) { | |
6f4f8056 HH |
60 | if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0) |
61 | continue; | |
62 | ||
3577de7a | 63 | if (table[i].target) { |
6dc2852c | 64 | const char *target = NULL, *s; |
e1ae9755 KS |
65 | |
66 | /* check if one of the targets exists */ | |
67 | NULSTR_FOREACH(s, table[i].target) { | |
68 | if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
69 | continue; | |
70 | ||
3fd165e5 KS |
71 | /* check if a specific file exists at the target path */ |
72 | if (table[i].exists) { | |
73 | _cleanup_free_ char *p = NULL; | |
74 | ||
75 | p = strjoin(s, "/", table[i].exists, NULL); | |
76 | if (!p) | |
77 | return log_oom(); | |
78 | ||
79 | if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0) | |
80 | continue; | |
81 | } | |
82 | ||
e1ae9755 KS |
83 | target = s; |
84 | break; | |
85 | } | |
86 | ||
87 | if (!target) | |
3577de7a KS |
88 | continue; |
89 | ||
e1ae9755 | 90 | r = symlinkat(target, fd, table[i].dir); |
4a62c710 MS |
91 | if (r < 0 && errno != EEXIST) |
92 | return log_error_errno(errno, "Failed to create symlink at %s/%s: %m", root, table[i].dir); | |
3577de7a KS |
93 | continue; |
94 | } | |
95 | ||
96 | RUN_WITH_UMASK(0000) | |
97 | r = mkdirat(fd, table[i].dir, table[i].mode); | |
4a62c710 MS |
98 | if (r < 0 && errno != EEXIST) |
99 | return log_error_errno(errno, "Failed to create directory at %s/%s: %m", root, table[i].dir); | |
3577de7a KS |
100 | } |
101 | ||
102 | return 0; | |
103 | } |