blob: b4dcad41ab1e1eeab4c77ecf734a722809f08c86 (
plain)
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
|
#!/bin/sh
# Copyright 2022 Tim Hildering
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program 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 General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
MOUNT_FS="${1}"
MOUNT_FSDIR="${2}"
MOUNT_FSOPTIONS=""
MOUNT_OPTIONS=""
MOUNT_FSTYPE=""
OVLROOT_CFGFILE="/etc/overlayroot.conf"
OVLROOT_MAINDIR="/.overlay"
OVLROOT_LOWERDIR_NAME="ro"
OVLROOT_UPPERDIR_NAME="rw"
OVLROOT_WORKDIR_NAME="work"
BASEDIR=""
LIMIT=10
CNT=0
[ -f "${OVLROOT_CFGFILE}" ] && . "${OVLROOT_CFGFILE}"
OVLROOT_LOWERDIR="${OVLROOT_MAINDIR}/${OVLROOT_LOWERDIR_NAME}"
OVLROOT_UPPERDIR="${OVLROOT_MAINDIR}/${OVLROOT_UPPERDIR_NAME}"
OVLROOT_WORKDIR="${OVLROOT_MAINDIR}/${OVLROOT_WORKDIR_NAME}"
shift 2
while getopts 'fnsvN:o:t:' OPT 2>/dev/null
do
case "${OPT}" in
f | n | s | v)
MOUNT_OPTIONS="${MOUNT_OPTIONS:-"-"}${OPT}"
;;
N)
MOUNT_OPTIONS="${MOUNT_OPTIONS} -N ${OPTARG}"
;;
o)
MOUNT_FSOPTIONS="${OPTARG}"
;;
t)
MOUNT_FSTYPE="${OPTARG#*.}"
;;
?)
exit 1
;;
*)
;;
esac
done
[ ${#MOUNT_FSOPTIONS} -eq 0 ] && exit 1
[ ${#MOUNT_FSTYPE} -eq 0 ] && exit 1
BASEDIR="$(basename "${MOUNT_FSDIR}")"
while [ -d "${OVLROOT_UPPERDIR}/${BASEDIR}" ]
do
[ ${CNT} -gt ${LIMIT} ] && exit 1
BASEDIR="${BASEDIR}$((CNT=CNT+1))"
done
mkdir -p "${OVLROOT_UPPERDIR}/${BASEDIR}"
mkdir -p "${OVLROOT_WORKDIR}/${BASEDIR}"
mount ${MOUNT_OPTIONS} -t "${MOUNT_FSTYPE}" -o "${MOUNT_FSOPTIONS}" \
"${MOUNT_FS}" "${OVLROOT_LOWERDIR}/${MOUNT_FSDIR}"
mount -t "overlay" -o \
"lowerdir=${OVLROOT_LOWERDIR}/${MOUNT_FSDIR},\
upperdir=${OVLROOT_UPPERDIR}/${BASEDIR},\
workdir=${OVLROOT_WORKDIR}/${BASEDIR}" "overlay-${BASEDIR}" \
"${MOUNT_FSDIR}"
exit 0
|