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Commit | Line | Data |
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e3642c43 DL |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
e3642c43 DL |
8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
d983b93c | 24 | #define _GNU_SOURCE |
e3642c43 DL |
25 | #include <errno.h> |
26 | #include <unistd.h> | |
d983b93c MN |
27 | #include <stdlib.h> |
28 | #include <stddef.h> | |
e3642c43 DL |
29 | #include <sys/types.h> |
30 | #include <sys/stat.h> | |
31 | #include <sys/mman.h> | |
d983b93c | 32 | #include <sys/param.h> |
6e4bb2e0 | 33 | #include <sys/mount.h> |
d983b93c MN |
34 | #include <dirent.h> |
35 | #include <fcntl.h> | |
1b09f2c0 | 36 | #include <libgen.h> |
e3642c43 DL |
37 | |
38 | #include "log.h" | |
39 | ||
40 | lxc_log_define(lxc_utils, lxc); | |
41 | ||
6e4bb2e0 MN |
42 | static int mount_fs(const char *source, const char *target, const char *type) |
43 | { | |
44 | /* the umount may fail */ | |
45 | if (umount(target)) | |
46 | WARN("failed to unmount %s : %s", target, strerror(errno)); | |
47 | ||
48 | if (mount(source, target, type, 0, NULL)) { | |
49 | ERROR("failed to mount %s : %s", target, strerror(errno)); | |
50 | return -1; | |
51 | } | |
52 | ||
53 | DEBUG("'%s' mounted on '%s'", source, target); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | extern int lxc_setup_fs(void) | |
59 | { | |
60 | if (mount_fs("proc", "/proc", "proc")) | |
61 | return -1; | |
62 | ||
721d262c | 63 | /* if we can't mount /dev/shm, continue anyway */ |
6e4bb2e0 | 64 | if (mount_fs("shmfs", "/dev/shm", "tmpfs")) |
3283db09 | 65 | INFO("failed to mount /dev/shm"); |
6e4bb2e0 MN |
66 | |
67 | /* If we were able to mount /dev/shm, then /dev exists */ | |
b91b1cd7 | 68 | /* Sure, but it's read-only per config :) */ |
6e4bb2e0 | 69 | if (access("/dev/mqueue", F_OK) && mkdir("/dev/mqueue", 0666)) { |
b91b1cd7 SH |
70 | DEBUG("failed to create '/dev/mqueue'"); |
71 | return 0; | |
6e4bb2e0 MN |
72 | } |
73 | ||
74 | if (mount_fs("mqueue", "/dev/mqueue", "mqueue")) | |
75 | return -1; | |
76 | ||
77 | return 0; | |
78 | } | |
9ddaf3bf JHS |
79 | |
80 | /* borrowed from iproute2 */ | |
7c11d57a | 81 | extern int get_u16(unsigned short *val, const char *arg, int base) |
9ddaf3bf JHS |
82 | { |
83 | unsigned long res; | |
84 | char *ptr; | |
85 | ||
86 | if (!arg || !*arg) | |
87 | return -1; | |
88 | ||
89 | res = strtoul(arg, &ptr, base); | |
90 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF) | |
91 | return -1; | |
92 | ||
93 | *val = res; | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
883f4a1e SH |
98 | static int is_all_slashes(char *path) |
99 | { | |
100 | while (*path && *path == '/') | |
101 | path++; | |
102 | if (*path) | |
103 | return 0; | |
104 | return 1; | |
105 | } | |
106 | ||
1b09f2c0 DL |
107 | extern int mkdir_p(char *dir, mode_t mode) |
108 | { | |
109 | int ret; | |
110 | char *d; | |
111 | ||
883f4a1e | 112 | if (is_all_slashes(dir)) |
1b09f2c0 DL |
113 | return 0; |
114 | ||
115 | d = strdup(dir); | |
116 | if (!d) | |
117 | return -1; | |
118 | ||
119 | ret = mkdir_p(dirname(d), mode); | |
120 | free(d); | |
121 | if (ret) | |
122 | return -1; | |
123 | ||
124 | if (!access(dir, F_OK)) | |
125 | return 0; | |
126 | ||
127 | if (mkdir(dir, mode)) { | |
128 | SYSERROR("failed to create directory '%s'\n", dir); | |
129 | return -1; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
2a59a681 SH |
134 | |
135 | static char *copypath(char *p) | |
136 | { | |
137 | int len = strlen(p); | |
138 | char *retbuf; | |
139 | ||
140 | if (len < 1) | |
141 | return NULL; | |
142 | if (p[len-1] == '\n') { | |
143 | p[len-1] = '\0'; | |
144 | len--; | |
145 | } | |
146 | retbuf = malloc(len+1); | |
147 | if (!retbuf) | |
148 | return NULL; | |
149 | strcpy(retbuf, p); | |
150 | return retbuf; | |
151 | } | |
152 | ||
67e571de SG |
153 | char *default_lxcpath; |
154 | ||
155 | const char *default_lxc_path(void) | |
2a59a681 | 156 | { |
67e571de | 157 | char buf[1024], *p; |
2a59a681 SH |
158 | FILE *fin; |
159 | ||
67e571de SG |
160 | if (default_lxcpath) |
161 | return default_lxcpath; | |
162 | ||
2a59a681 SH |
163 | fin = fopen(LXC_GLOBAL_CONF, "r"); |
164 | if (fin) { | |
165 | while (fgets(buf, 1024, fin)) { | |
166 | if (buf[0] == '#') | |
167 | continue; | |
168 | p = strstr(buf, "lxcpath"); | |
169 | if (!p) | |
170 | continue; | |
171 | p = strchr(p, '='); | |
172 | if (!p) | |
173 | continue; | |
174 | p++; | |
175 | while (*p && (*p == ' ' || *p == '\t')) p++; | |
176 | if (!*p) | |
177 | continue; | |
67e571de | 178 | default_lxcpath = copypath(p); |
2a59a681 SH |
179 | goto out; |
180 | } | |
181 | } | |
182 | /* we couldn't open the file, or didn't find a lxcpath | |
183 | * entry there. Return @LXCPATH@ */ | |
67e571de | 184 | default_lxcpath = LXCPATH; |
2a59a681 SH |
185 | |
186 | out: | |
187 | if (fin) | |
188 | fclose(fin); | |
67e571de | 189 | return default_lxcpath; |
2a59a681 | 190 | } |