# rpm -qp --scripts ./kernel-4.9.135-1.x86_64.rpm
postinstall scriptlet (using /bin/sh):
if [ -x /sbin/installkernel -a -r /boot/vmlinuz-4.9.135 -a -r /boot/System.map-4.9.135 ]; then
cp /boot/vmlinuz-4.9.135 /boot/.vmlinuz-4.9.135-rpm
cp /boot/System.map-4.9.135 /boot/.System.map-4.9.135-rpm
rm -f /boot/vmlinuz-4.9.135 /boot/System.map-4.9.135
/sbin/installkernel 4.9.135 /boot/.vmlinuz-4.9.135-rpm /boot/.System.map-4.9.135-rpm
rm -f /boot/.vmlinuz-4.9.135-rpm /boot/.System.map-4.9.135-rpm
fi
...

if [ -n "$cfgLoader" ] && [ -x /sbin/new-kernel-pkg ]; then
if [ -n "$(which dracut 2>/dev/null)" ]; then
    new-kernel-pkg --mkinitrd --dracut --host-only --depmod --install --kernel-name $KERNEL_NAME $KERNEL_VERSION
else
    new-kernel-pkg --mkinitrd --depmod --install --kernel-name $KERNEL_NAME $KERNEL_VERSION
fi
new-kernel-pkg --rpmposttrans --kernel-name $KERNEL_NAME $KERNEL_VERSION
fi