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#!/sbin/runscript
# script that will mount image with modules
depend() {
need dev
before checkfs fsck hwdrivers modules hwclock
keyword novserver
}
# read kernel options
init_KOPT() {
eval set -- $(cat /proc/cmdline 2>/dev/null)
while [ $# -gt 0 ]; do
case "$1" in
*=*) eval "KOPT_${1%%=*}='${1#*=}'" ;;
*) eval "KOPT_$(echo $1 | sed 's: :_:g')=yes" ;;
esac
shift
done
}
resolve_dev() {
case "$1" in
UUID=*|LABEL=*) findfs "$1";;
*) readlink -f "$1";;
esac
}
find_mnt() {
local search_dev="$1" fstab="$2"
local dev mnt fs mntopts chk
case "$search_dev" in
UUID=*|LABEL=*|/dev/*);;
*) search_dev=/dev/$search_dev;;
esac
local search_real_dev=$(resolve_dev $search_dev)
while read dev mnt fs mntopts chk; do
local real_dev=$(resolve_dev $dev)
local i j
for i in "$search_dev" "$search_real_dev"; do
[ -z "$i" ] && continue
for j in "$dev" "$real_dev"; do
[ -z "$j" ] && continue
if [ "$i" = "$j" ]; then
echo "$mnt"
return
fi
done
done
done < $fstab 2>/dev/null
}
# initialies: alpine_dev, alpine_mnt, alpine_fs, alpine_mounted
find_media() {
init_KOPT
alpine_mounted=
alpine_dev=${KOPT_alpine_dev%%:*}
alpine_fs=${KOPT_alpine_dev#*:}
[ "$alpine_fs" = "$KOPT_alpine_dev" ] && unset alpine_fs
# first we check if alpine_dev is mounted and use this
alpine_mnt=$(find_mnt $alpine_dev /proc/mounts)
if [ -z "$alpine_mnt" ]; then
# then we check fstab
alpine_mnt=$(find_mnt /dev/$alpine_dev /etc/fstab)
else
alpine_mounted=yes
fi
# finally we fallback to /media/<devicename>
[ -z "$alpine_mnt" ] && alpine_mnt=/media/$alpine_dev
}
start() {
local modloop mount_opts
find_media
if [ -z "$alpine_dev" ] ; then
return 0
fi
modloop=${KOPT_modloop:-$KOPT_BOOT_IMAGE.cmg}
[ -n "$alpine_fs" ] && mount_opts="-t $alpine_fs"
ebegin "Mounting loopback device for kernel modules"
if [ -z "$alpine_mounted" ]; then
mount $mount_opts /dev/$alpine_dev $alpine_mnt 2>/dev/null
fi
mkdir -p /.modloop /lib
mount -o loop,ro -t cramfs $alpine_mnt/$modloop /.modloop
eend $? || return 1
#use unionfs is available and configured
if grep -q -w "unionfs$" /proc/filesystems && [ -n "$unionfs_size" ]; then
ebegin "UnionFS detected. Mounting modloop rw"
mkdir -p /.modunisonfs/modules /lib/modules
mount -t tmpfs -o size="$unionfs_size" tmpfs /.modunisonfs/modules
mount -t unionfs -o dirs=/.modunisonfs/modules=rw:/.modloop/modules=ro unionfs /lib/modules
eend $? || return 1
else
rm -rf /lib/modules && ln -sf /.modloop/modules /lib/
fi
# copy firmware if there are any
if [ -d $alpine_mnt/firmware ]; then
ebegin "Copying firmware from $alpine_mnt/firmware"
cp -R -a $alpine_mnt/firmware /lib/
eend $?
fi
}
stop() {
local rc=0
find_media
[ -z "$alpine_dev" ] && return 0
ebegin "Unmounting loopback device for kernel modules"
if mountinfo --quiet /.modloop; then
umount -d /.modloop || rc=1
fi
if mountinfo --quiet $alpine_mnt; then
umount $alpine_mnt || rc=1
fi
eend $rc
}
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