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#
# While installing a rpm to update kernel on a deployed target, it will update
# the boot area and the boot menu with the kernel as the priority but allow
# you to fall back to the original kernel as well.
#
# - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid
# probable confliction with the new one.
#
# - In kernel-image's postinstall scriptlet, it modifies grub's config file to
# updates the new kernel as the boot priority.
#
pkg_preinst_kernel-image_append () {
# Parsing confliction
[ -f "$D/boot/grub/menu.list" ] && grubcfg="$D/boot/grub/menu.list"
[ -f "$D/boot/grub/grub.cfg" ] && grubcfg="$D/boot/grub/grub.cfg"
if [ -n "$grubcfg" ]; then
# Dereference symlink to avoid confliction with new kernel name.
if grep -q "/${KERNEL_IMAGETYPE} \+root=" $grubcfg; then
if [ -L "$D/boot/${KERNEL_IMAGETYPE}" ]; then
kimage=`realpath $D/boot/${KERNEL_IMAGETYPE} 2>/dev/null`
if [ -f "$D$kimage" ]; then
sed -i "s:${KERNEL_IMAGETYPE} \+root=:${kimage##*/} root=:" $grubcfg
fi
fi
fi
# Rename old kernel if it conflicts with new kernel name.
if grep -q "/${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=" $grubcfg; then
if [ -f "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" ]; then
timestamp=`date +%s`
kimage="$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-$timestamp-back"
sed -i "s:${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=:${kimage##*/} root=:" $grubcfg
mv "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" "$kimage"
fi
fi
fi
}
pkg_postinst_kernel-image_prepend () {
get_new_grub_cfg() {
grubcfg="$1"
old_image="$2"
title="Update ${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-${PV}"
if [ "${grubcfg##*/}" = "grub.cfg" ]; then
rootfs=`grep " *linux \+[^ ]\+ \+root=" $grubcfg -m 1 | \
sed "s#${old_image}#${old_image%/*}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}#"`
echo "menuentry \"$title\" {"
echo " set root=(hd0,1)"
echo "$rootfs"
echo "}"
elif [ "${grubcfg##*/}" = "menu.list" ]; then
rootfs=`grep "kernel \+[^ ]\+ \+root=" $grubcfg -m 1 | \
sed "s#${old_image}#${old_image%/*}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}#"`
echo "default 0"
echo "timeout 30"
echo "title $title"
echo "root (hd0,0)"
echo "$rootfs"
fi
}
get_old_grub_cfg() {
grubcfg="$1"
if [ "${grubcfg##*/}" = "grub.cfg" ]; then
cat "$grubcfg"
elif [ "${grubcfg##*/}" = "menu.list" ]; then
cat "$grubcfg" | sed -e '/^default/d' -e '/^timeout/d'
fi
}
if [ -f "$D/boot/grub/grub.cfg" ]; then
grubcfg="$D/boot/grub/grub.cfg"
old_image=`grep ' *linux \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
elif [ -f "$D/boot/grub/menu.list" ]; then
grubcfg="$D/boot/grub/menu.list"
old_image=`grep '^kernel \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
fi
# Don't update grubcfg at first install while old bzImage doesn't exist.
if [ -f "$D/boot/${old_image##*/}" ]; then
grubcfgtmp="$grubcfg.tmp"
get_new_grub_cfg "$grubcfg" "$old_image" > $grubcfgtmp
get_old_grub_cfg "$grubcfg" >> $grubcfgtmp
mv $grubcfgtmp $grubcfg
echo "Caution! Update kernel may affect kernel-module!"
fi
}
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