#!/bin/sh
set -e

version=5.4.0-200-generic
image_path=/boot/vmlinuz-$version

#
# When we install linux-image we have to run kernel postinst.d support to
# generate the initramfs, create links etc.  Should it have an associated
# linux-image-extra package and we install that we also need to run kernel
# postinst.d, to regenerate the initramfs.  If we are installing both at the
# same time, we necessarily trigger kernel postinst.d twice. As this includes
# rebuilding the initramfs and reconfiguring the boot loader this is very time
# consuming.
#
# Similarly for removal when we remove the linux-image-extra package we need to
# run kernel postinst.d handling in order to pare down the initramfs to
# linux-image contents only.  When we remove the linux-image need to remove the
# now redundant initramfs.  If we are removing both at the same time, then
# we will rebuilt the initramfs and then immediatly remove it.
#
# Switches to using a trigger against the linux-image package for all
# postinst.d and postrm.d handling.  On installation postinst.d gets triggered
# twice once by linux-image and once by linux-image-extra.  As triggers are
# non-cumulative we will only run this processing once.  When removing both
# packages we will trigger postinst.d from linux-image-extra and then in
# linux-image postrm.d we effectivly ignore the pending trigger and simply run
# the postrm.d.  This prevents us from rebuilding the initramfs.
#
if [ "$1" = triggered ]; then
    trigger=/usr/lib/linux/triggers/$version
    if [ -f "$trigger" ]; then
	sh "$trigger"
	rm -f "$trigger"
    fi
    exit 0
fi

if [ "$1" != configure ]; then
    exit 0
fi

depmod $version

if [ -f /lib/modules/$version/.fresh-install ]; then
    change=install
else
    change=upgrade
fi
linux-update-symlinks $change $version $image_path
rm -f /lib/modules/$version/.fresh-install

if [ -d /etc/kernel/postinst.d ]; then
    mkdir -p /usr/lib/linux/triggers
    cat - >/usr/lib/linux/triggers/$version <<EOF
DEB_MAINT_PARAMS="$*" run-parts --report --exit-on-error --arg=$version \
      --arg=$image_path /etc/kernel/postinst.d
EOF
    dpkg-trigger --no-await linux-update-$version
fi

exit 0