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#!/sbin/openrc-run
# script that will mount image with modules
depend() {
need dev
before checkfs fsck hwdrivers modules hwclock
keyword -vserver -lxc
}
# read kernel options
init_KOPT() {
eval set -- $(cat /proc/cmdline 2>/dev/null)
for opt; do
case "$opt" in
modloop=*)
eval "KOPT_${opt%%=*}='${opt#*=}'" ;;
esac
done
}
mountdirs() {
awk '$2 !~ /^\/(sys|proc|dev|run)/ && $2 != "/" {print $2}' /proc/mounts
}
find_modloop() {
local dir="$1"
local kver=$(uname -r)
local oifs="$IFS"
IFS=$'\n'
set -- $(blkid "$dir"/boot/* "$dir"/*)
IFS="$oifs"
for line; do
img=${line%%:*}
mount "$img" -o loop,ro /.modloop || continue
if [ -d /.modloop/modules/$kver ]; then
return 0
fi
umount /.modloop
done
return 1
}
find_backing_file() {
local dir="$1"
local dev=$(df -P "$dir" | tail -1 | awk '{print $1}')
cat /sys/block/${dev#/dev/}/loop/backing_file 2>/dev/null
}
find_alpine_mnt() {
local img="$(find_backing_file $1)"
if [ -n "$img" ]; then
df -P "$img" | tail -1 | awk '{print $6}'
fi
}
start() {
local modloop= mount_opts= modloop_dldir="/lib"
mkdir -p /.modloop /lib
case "$KOPT_modloop" in
http://*|https://|ftp://*)
wget -P "$modloop_dldir" "$KOPT_modloop" \
&& modloop=$modloop_dldir/$(basename $KOPT_modloop)
;;
"")
ewarn "WARNING! modloop boot option is missing."
;;
*)
for dir in $(mountdirs); do
if [ -f "$dir"/$KOPT_modloop ]; then
modloop="$dir/${KOPT_modloop##/}"
alpine_mnt="$dir"
break
fi
done
;;
esac
ebegin "Mounting modloop $modloop"
if [ -n "$modloop" ]; then
mount -o loop,ro $modloop /.modloop
eend $? || return 1
else
for dir in $(mountdirs); do
if find_modloop "$dir"; then
alpine_mnt="$dir"
break
fi
done
if [ -d /.modloop/modules/$(uname -r) ]; then
eend 0
else
eend 1 || return 1
fi
fi
#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 $?
elif [ -d /lib/modules/firmware ]; then
rmdir /lib/firmware 2>/dev/null \
&& ln -s /lib/modules/firmware /lib/
fi
return 0
}
stop() {
local rc=0
alpine_mnt=$(find_alpine_mnt /.modloop)
if mountinfo --quiet /.modunisonfs/modules && mountinfo --quiet /lib/modules; then
umount /lib/modules
umount /.modunisonfs/modules
fi
if mountinfo --quiet /.modloop; then
ebegin "Unmounting /.modloop"
umount -d /.modloop
eend $? || return 1
fi
if [ -n "$alpine_mnt" ] && mountinfo --quiet $alpine_mnt; then
ebegin "Unmounting $alpine_mnt"
umount $alpine_mnt
eend $?
fi
}
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