#!/bin/bash

rel=$(lsb_release -sc)
ver=$(lsb_release -sr | sed -r 's/^(..)\.(..).*/\1\2/')

if [ ! "$rel" -o "$(lsb_release -si)" != "Ubuntu" ]
then
	echo "Could not determine Ubuntu release (install lsb-release?)" >&2
	exit 1
fi

case $ver in
	1204)
		suites_infra="$rel"
		suites_apps=
		;;
	1404)
		suites_infra="$rel-security $rel-updates $rel-infra-security $rel-infra-updates"
		suites_apps=
		;;
	*)
		suites_infra="$rel-infra-security $rel-infra-updates"
		suites_apps="$rel-apps-security $rel-apps-updates"
		;;
esac

types=deb
if apt-cache showsrc apt &>/dev/null
then
	# 'Main' apt sources have deb-src lines defined, so include them here too
	types="$types deb-src"
fi

key_infra="-----BEGIN PGP PUBLIC KEY BLOCK-----

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geD0AwbwqVFWiaWUTnaBbVGAXCr0hDbUw7MH0/ptQLJ8XdwFiOBVPg==
=+H1b
-----END PGP PUBLIC KEY BLOCK-----"

if [ $ver -lt 2204 ]
then
	mkdir -p /etc/apt/keyrings
	sb_infra=/etc/apt/keyrings/esm-infra.gpg
	sb_apps=/etc/apt/keyrings/esm-apps.gpg
	echo "$key_infra" | apt-key --keyring $sb_infra add -
	echo "$key_apps" | apt-key --keyring $sb_apps add -
else
	sb_infra=$'\n'"$(echo "$key_infra" | sed 's/^$/./;s/^/ /')"
	sb_apps=$'\n'"$(echo "$key_apps" | sed 's/^$/./;s/^/ /')"
	rm -vf /etc/apt/keyrings/esm-{infra,apps}.gpg
fi

cat >/etc/apt/sources.list.d/esm.sources <<EOF
Types: $types
URIs: https://esm.malc.org.uk/infra/ubuntu
Suites: $rel-infra-security $rel-infra-updates
Components: main
Signed-By: $sb_infra
EOF

[ "$suites_apps" ] && \
cat >>/etc/apt/sources.list.d/esm.sources <<EOF

Types: $types
URIs: https://esm.malc.org.uk/apps/ubuntu
Suites: $suites_apps
Components: main
Signed-By: $sb_apps
EOF

# Clean up after pre-deb822 versions of this script
rm -f /etc/apt/sources.list.d/esm.list /etc/apt/trusted.gpg.d/ubuntu-advantage-esm-infra-trusty.gpg /etc/apt/trusted.gpg.d/ubuntu-advantage-esm-apps.gpg

apt update

# Suppress a pointless warning from update-motd-updates-available
mkdir -p /var/lib/ubuntu-advantage/apt-esm/etc/apt/preferences.d /var/lib/ubuntu-advantage/apt-esm/etc/apt/apt.conf.d

[ -x /usr/lib/update-notifier/update-motd-updates-available ] && /usr/lib/update-notifier/update-motd-updates-available --force || true