1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Kay Sievers
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include "base-filesystem.h"
#include "log.h"
#include "macro.h"
#include "strv.h"
#include "util.h"
#include "label.h"
#include "mkdir.h"
typedef struct BaseFilesystem {
const char *dir;
mode_t mode;
const char *target;
const char *exists;
} BaseFilesystem;
static const BaseFilesystem table[] = {
{ "bin", 0, "usr/bin\0", NULL },
{ "lib", 0, "usr/lib\0", NULL },
{ "root", 0755, NULL, NULL },
{ "sbin", 0, "usr/sbin\0", NULL },
#if defined(__i386__) || defined(__x86_64__)
{ "lib64", 0, "usr/lib/x86_64-linux-gnu\0"
"usr/lib64\0", "ld-linux-x86-64.so.2" },
#endif
};
int base_filesystem_create(const char *root) {
_cleanup_close_ int fd = -1;
unsigned i;
int r;
fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (fd < 0) {
log_error_errno(errno, "Failed to open root file system: %m");
return -errno;
}
for (i = 0; i < ELEMENTSOF(table); i ++) {
if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0)
continue;
if (table[i].target) {
const char *target = NULL, *s;
/* check if one of the targets exists */
NULSTR_FOREACH(s, table[i].target) {
if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
continue;
/* check if a specific file exists at the target path */
if (table[i].exists) {
_cleanup_free_ char *p = NULL;
p = strjoin(s, "/", table[i].exists, NULL);
if (!p)
return log_oom();
if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
continue;
}
target = s;
break;
}
if (!target)
continue;
r = symlinkat(target, fd, table[i].dir);
if (r < 0 && errno != EEXIST) {
log_error_errno(errno, "Failed to create symlink at %s/%s: %m", root, table[i].dir);
return -errno;
}
continue;
}
RUN_WITH_UMASK(0000)
r = mkdirat(fd, table[i].dir, table[i].mode);
if (r < 0 && errno != EEXIST) {
log_error_errno(errno, "Failed to create directory at %s/%s: %m", root, table[i].dir);
return -errno;
}
}
return 0;
}
|
