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#!/bin/sh -e
# update-kernel
#
# Kernel and firmware update script for Alpine installations set up
# with setup-bootable
#
# Copyright (c) 2014 Timo Teräs
# Copyright (c) 2014 Kaarle Ritvanen
TMPDIR=
SIGNALS="HUP INT TERM"
SCRIPT=update-kernel
VIRTUAL=.tmp-$SCRIPT
while read MOUNT; do
set -- $MOUNT
[ $2 = /.modloop ] || continue
DESTDIR=$(dirname $(losetup $1 | cut -d " " -f 3))
MNTDIR=$(dirname $DESTDIR)
break
done < /proc/mounts
if [ -z "$MNTDIR" ]; then
echo "Module loopback device not mounted" >&2
exit 1
fi
remount() {
mount $1 -o remount $MNTDIR
}
ignore_sigs() {
trap "" $SIGNALS
}
clean_up() {
set +e
ignore_sigs
apk del $VIRTUAL
rm -fr $TMPDIR
}
trap clean_up EXIT $SIGNALS
apk add -U --virtual $VIRTUAL mkinitfs squashfs-tools
. /etc/mkinitfs/mkinitfs.conf
ARCH=$(apk --print-arch)
FLAVOR=$(uname -r | cut -d - -f 3-)
TMPDIR=$(mktemp -dt $SCRIPT.XXXXXX)
ROOT=$TMPDIR/root
apk add --arch $ARCH --root $ROOT --keys-dir /etc/apk/keys \
--repositories /etc/apk/repositories \
--initdb -U alpine-base dahdi-linux linux-$FLAVOR linux-firmware
KVER=$(ls $ROOT/lib/modules)
depmod -b $ROOT $KVER
STAGING=$TMPDIR/boot
MODLOOP=$TMPDIR/modloop
MODIMG=$FLAVOR.modloop.squashfs
mkdir $MODLOOP $STAGING
cp -a $ROOT/lib/modules $MODLOOP
cp -a $ROOT/lib/firmware $MODLOOP/modules
mksquashfs $MODLOOP $STAGING/$MODIMG -comp xz
mkinitfs -F "$features squashfs" -b $ROOT -o $STAGING/$FLAVOR.gz $KVER
cp $ROOT/boot/vmlinuz-$FLAVOR $STAGING/$FLAVOR
ignore_sigs
remount -w
rm -f $DESTDIR/$MODIMG
mv $STAGING/* $DESTDIR
set +e
sync
remount -r
exit 0
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