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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
DESTDIR=$1
MNTDIR=
if [ -z "$DESTDIR" ]; then
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
fi
remount() {
mount $1 -o remount "$MNTDIR"
}
ignore_sigs() {
trap "" $SIGNALS
}
clean_up() {
set +e
ignore_sigs
apk del -q $VIRTUAL
rm -fr "$TMPDIR"
}
trap clean_up EXIT $SIGNALS
apk add -qU -t $VIRTUAL mkinitfs squashfs-tools
. /etc/mkinitfs/mkinitfs.conf
ARCH=$(apk --print-arch)
FLAVOR=$(uname -r | cut -d - -f 3-)
TMPDIR=$(mktemp -dt $SCRIPT.XXXXXX)
ROOT=$TMPDIR/root
_apk() {
apk add -q -p "$ROOT" --no-scripts --arch $ARCH --keys-dir /etc/apk/keys \
--repositories-file /etc/apk/repositories $*
}
_apk -U --initdb alpine-base linux-$FLAVOR linux-firmware
_apk dahdi-linux dahdi-linux-$FLAVOR || :
_apk xtables-addons-$FLAVOR || :
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/$MODIMG" -comp xz
mkinitfs -q -F "$features squashfs" -b "$ROOT" -o "$STAGING/$FLAVOR.gz" $KVER
cp "$ROOT/boot/vmlinuz-$FLAVOR" "$STAGING/$FLAVOR"
if [ "$MNTDIR" ]; then
ignore_sigs
remount -w
rm -f "$DESTDIR/$MODIMG"
fi
mv "$STAGING"/* "$DESTDIR"
if [ "$MNTDIR" ]; then
set +e
sync
remount -r
fi
exit 0
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