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e9df7e1a CB |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <daniel.lezcano at free.fr> | |
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #define _GNU_SOURCE | |
25 | #include <grp.h> | |
26 | #include <sched.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <stdint.h> | |
30 | #include <string.h> | |
31 | #include <unistd.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/mount.h> | |
34 | ||
e9df7e1a | 35 | #include "log.h" |
28d832c4 CB |
36 | #include "rsync.h" |
37 | #include "storage.h" | |
e9df7e1a CB |
38 | #include "utils.h" |
39 | ||
10bc1861 | 40 | lxc_log_define(rsync, lxc); |
e9df7e1a | 41 | |
17a367d8 | 42 | int lxc_storage_rsync_exec_wrapper(void *data) |
301faec2 CB |
43 | { |
44 | struct rsync_data *arg = data; | |
45 | return lxc_rsync(arg); | |
46 | } | |
47 | ||
17a367d8 CB |
48 | int lxc_rsync_exec_wrapper(void *data) |
49 | { | |
50 | int ret; | |
51 | struct rsync_data_char *args = data; | |
52 | ||
53 | ret = lxc_switch_uid_gid(0, 0); | |
54 | if (ret < 0) | |
55 | return -1; | |
56 | ||
57 | ret = lxc_setgroups(0, NULL); | |
58 | if (ret < 0) | |
59 | return -1; | |
60 | ||
61 | return lxc_rsync_exec(args->src, args->dest); | |
62 | } | |
63 | ||
301faec2 CB |
64 | int lxc_rsync_exec(const char *src, const char *dest) |
65 | { | |
66 | int ret; | |
67 | size_t l; | |
68 | char *s; | |
69 | ||
70 | l = strlen(src) + 2; | |
71 | s = malloc(l); | |
72 | if (!s) | |
73 | return -1; | |
74 | ||
75 | ret = snprintf(s, l, "%s", src); | |
76 | if (ret < 0 || (size_t)ret >= l) | |
77 | return -1; | |
78 | ||
79 | s[l - 2] = '/'; | |
80 | s[l - 1] = '\0'; | |
81 | ||
82 | execlp("rsync", "rsync", "-aHXS", "--delete", s, dest, (char *)NULL); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | int lxc_rsync(struct rsync_data *data) | |
87 | { | |
88 | int ret; | |
41dc7155 | 89 | const char *dest, *src; |
17a367d8 | 90 | struct lxc_storage *orig = data->orig, *new = data->new; |
301faec2 CB |
91 | |
92 | ret = unshare(CLONE_NEWNS); | |
93 | if (ret < 0) { | |
94 | SYSERROR("Failed to unshare CLONE_NEWNS"); | |
95 | return -1; | |
96 | } | |
97 | ||
98 | ret = detect_shared_rootfs(); | |
99 | if (ret) { | |
100 | ret = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL); | |
101 | if (ret < 0) | |
102 | SYSERROR("Failed to make \"/\" a slave mount"); | |
103 | } | |
104 | ||
105 | ret = orig->ops->mount(orig); | |
106 | if (ret < 0) { | |
107 | ERROR("Failed mounting \"%s\" on \"%s\"", orig->src, orig->dest); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | ret = new->ops->mount(new); | |
112 | if (ret < 0) { | |
113 | ERROR("Failed mounting \"%s\" onto \"%s\"", new->src, new->dest); | |
114 | return -1; | |
115 | } | |
116 | ||
117 | ret = lxc_switch_uid_gid(0, 0); | |
118 | if (ret < 0) | |
119 | return -1; | |
17a367d8 | 120 | |
301faec2 CB |
121 | ret = lxc_setgroups(0, NULL); |
122 | if (ret < 0) | |
123 | return -1; | |
124 | ||
125 | src = lxc_storage_get_path(orig->dest, orig->type); | |
126 | dest = lxc_storage_get_path(new->dest, new->type); | |
127 | ||
128 | ret = lxc_rsync_exec(src, dest); | |
129 | if (ret < 0) { | |
130 | ERROR("Failed to rsync from \"%s\" into \"%s\"", src, dest); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } |