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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
SCRIPT=update-kernel
VIRTUAL=.tmp-$SCRIPT
SUPERUSER=
[ $(id -u) -eq 0 ] && SUPERUSER=Y
BUILDDIR=
FLAVOR=
MNTDIR=
PACKAGES=
SIGNALS="HUP INT TERM"
TMPDIR=
features=
error() {
echo "$SCRIPT: $1" >&2
}
usage() {
[ "$2" ] && error "$2"
local opts="[-F <feature>]... [-p <package>]..."
cat >&2 <<EOF
Syntax: $SCRIPT $opts [<dest_dir>]
$SCRIPT -f <flavor> $opts <dest_dir>
$SCRIPT -b <build_dir> $opts [<dest_dir>]
Options: -b|--build <build_dir> Install custom-built kernel
-f|--flavor <flavor> Install kernel of specified flavor
-F|--feature <feature> Enable initfs feature
-p|--package <package> Additional module or firmware package
-v|--verbose Verbose output
EOF
exit $1
}
QUIET_OPT="--quiet"
OPTS=$(getopt -l build-dir:,flavor:,feature:,help,package:,verbose -n $SCRIPT \
-o b:f:F:hp:v -- "$@") || usage 1
eval set -- "$OPTS"
while :; do
case "$1" in
-b|--build-dir)
BUILDDIR=$2
shift
;;
-f|--flavor)
FLAVOR=$2
shift
;;
-F|--feature)
features="$features $2"
shift
;;
-h|--help)
echo "$SCRIPT @VERSION@" >&2
usage 0
;;
-p|--package)
PACKAGES="$PACKAGES $2"
shift
;;
-v|--verbose)
QUIET_OPT=
;;
--)
break
;;
esac
shift
done
DESTDIR=$2
[ "$BUILDDIR" -a "$FLAVOR" ] && \
usage 1 "Cannot specify both build directory and flavor"
if [ -z "$DESTDIR" ]; then
[ "$FLAVOR" ] && \
usage 1 "Cannot specify flavor when updating the current kernel"
[ "$SUPERUSER" ] || \
usage 1 "Specify destination directory or run as superuser"
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
error "Module loopback device not mounted"
exit 1
fi
fi
remount() {
mount $1 -o remount "$MNTDIR"
}
ignore_sigs() {
trap "" $SIGNALS
}
clean_up() {
set +e
ignore_sigs
[ "$SUPERUSER" ] && apk del $QUIET_OPT $VIRTUAL
rm -fr $TMPDIR
}
trap clean_up EXIT $SIGNALS
if [ "$SUPERUSER" ]; then
apk add $QUIET_OPT --update--cache -t $VIRTUAL mkinitfs squashfs-tools
fi
if [ -z "$features" ]; then
. /etc/mkinitfs/mkinitfs.conf
fi
if [ -z "$FLAVOR" ]; then
FLAVOR=$(uname -r | cut -d - -f 3-)
[ "$FLAVOR" ] || FLAVOR=vanilla
fi
TMPDIR=$(mktemp -d /tmp/$SCRIPT.XXXXXX)
ROOT=$TMPDIR/root
BOOT=$ROOT/boot
WRAPPER=
_exec() {
$WRAPPER "$@"
}
_apk() {
local cmd=$1
shift
local wrapper=
if [ -z "$SUPERUSER" ]; then
local opt=
local fake_env=$TMPDIR/fake-env
if [ -f $fake_env ]; then
opt="-i $fake_env"
WRAPPER="fakeroot $opt --"
fi
wrapper="fakeroot $opt -s $fake_env --"
fi
$wrapper apk $cmd $QUIET_OPT -p $ROOT --keys-dir /etc/apk/keys \
--repositories-file /etc/apk/repositories $*
}
extra_pkgs() {
local res=$(_apk search -x $1)
if [ "$res" ]; then
echo $*
fi
}
# set up the root and get the APKINDEX for search
_apk add --initdb --update-cache
if [ "$BUILDDIR" ]; then
mkdir -p $BOOT
make -C "$BUILDDIR" firmware_install install modules_install \
INSTALL_MOD_PATH=$ROOT INSTALL_PATH=$BOOT
else
if [ -z "$PACKAGES" ]; then
PACKAGES="$(extra_pkgs "dahdi-linux-$FLAVOR" dahdi-linux)
$(extra_pkgs "xtables-addons-$FLAVOR")"
fi
PACKAGES="$PACKAGES linux-$FLAVOR linux-firmware"
fi
_apk add --no-scripts alpine-base $PACKAGES
KVER_FLAVOR=
[ "$FLAVOR" = vanilla ] || KVER_FLAVOR=-$FLAVOR
KVER=$(basename $(ls -d $ROOT/lib/modules/*"$KVER_FLAVOR"))
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
_exec mksquashfs $MODLOOP "$STAGING/$MODIMG" -comp xz
_exec mkinitfs -q -b $ROOT -F "$features base squashfs" \
-o "$STAGING/$FLAVOR.gz" "$KVER"
cp "$BOOT/vmlinuz$KVER_FLAVOR" "$STAGING/$FLAVOR"
if [ "$MNTDIR" ]; then
ignore_sigs
umount /.modloop
remount -w
fi
mv $STAGING/* "$DESTDIR"
if [ "$MNTDIR" ]; then
set +e
sync
remount -r
mount -o loop "$DESTDIR/$MODIMG" /.modloop
fi
exit 0
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