update-kernel.in 1.81 KB
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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

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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
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fi

remount() {
    mount $1 -o remount $MNTDIR
}


ignore_sigs() {
    trap "" $SIGNALS
}

clean_up() {
    set +e
    ignore_sigs

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    apk del -q $VIRTUAL
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    rm -fr $TMPDIR
}

trap clean_up EXIT $SIGNALS


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apk add -qU -t $VIRTUAL mkinitfs squashfs-tools
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. /etc/mkinitfs/mkinitfs.conf

ARCH=$(apk --print-arch)
FLAVOR=$(uname -r | cut -d - -f 3-)
TMPDIR=$(mktemp -dt $SCRIPT.XXXXXX)
ROOT=$TMPDIR/root

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_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 || :

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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

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mkinitfs -q -F "$features squashfs" -b $ROOT -o $STAGING/$FLAVOR.gz $KVER
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cp $ROOT/boot/vmlinuz-$FLAVOR $STAGING/$FLAVOR


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if [ "$MNTDIR" ]; then
    ignore_sigs
    remount -w
    rm -f "$DESTDIR/$MODIMG"
fi
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mv $STAGING/* "$DESTDIR"
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if [ "$MNTDIR" ]; then
    set +e
    sync
    remount -r
fi
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exit 0