#!/bin/sh

set -e

PROJECT="progress-linux"
DOMAIN="progress-linux.org"
PACKAGES="https://deb.progress-linux.org/packages"
KEY="/usr/share/progress-linux/pgp-keys/deb.progress-linux.org.gpg"

Install_apt_sources ()
{
cat > "/etc/apt/sources.list.d/${PROJECT}.sources" << EOF
# /etc/apt/sources.list.d/${PROJECT}.sources
EOF
}

Remove_apt_sources ()
{
	rm -f "/etc/apt/sources.list.d/${PROJECT}.sources"
}

Install_apt_preferences ()
{
cat > "/etc/apt/preferences.d/${PROJECT}.pref" << EOF
# /etc/apt/preferences.d/${PROJECT}.pref
EOF
}

Remove_apt_preferences ()
{
	rm -f "/etc/apt/preferences.d/${PROJECT}.pref"
}

Configure_apt_sources ()
{
	# Configure repositories: ${release}, ${release}-security, ${release}-updates, ${release}-backports
	SUITES=""

	for ARCHIVE in ${ARCHIVES}
	do
		case "${ARCHIVE}" in
			*-extras|*-test)
				;;

			*)
				SUITES="${SUITES} ${ARCHIVE}"

				Configure_apt_preferences ${ARCHIVE}
				;;
		esac
	done

	COMPONENTS="$(echo ${ARCHIVE_AREAS} | sed -e 's| restricted||')"
	SUITES="$(echo ${SUITES} | sed -e 's|^ *||')"

	if [ -n "${SUITES}" ]
	then
		Configure_apt_sources_stanza "${SUITES}" "${COMPONENTS}"
	fi

	# Configure repositories: ${release}-extras, ${release}-test, ${release}-backports-extras, ${release}-backports-test
	SUITES=""

	for ARCHIVE in ${ARCHIVES}
	do
		case "${ARCHIVE}" in
			*-extras|*-test)
				SUITES="${SUITES} ${ARCHIVE}"

				Configure_apt_preferences ${ARCHIVE}
				;;

			*)
				;;
		esac
	done

	COMPONENTS="${ARCHIVE_AREAS}"
	SUITES="$(echo ${SUITES} | sed -e 's|^ *||')"

	if [ -n "${SUITES}" ]
	then
		Configure_apt_sources_stanza "${SUITES}" "${COMPONENTS}"
	fi
}

Configure_apt_sources_stanza ()
{
	SUITES="${1}"
	COMPONENTS="${2}"

cat >> "/etc/apt/sources.list.d/${PROJECT}.sources" << EOF

Types: deb
URIs: ${MIRROR}
Suites: ${SUITES}
Components: ${COMPONENTS}
PDiffs: no
Signed-By: ${KEY}
EOF
}

Configure_apt_preferences ()
{
	ARCHIVE="${1}"

	case "${ARCHIVE}" in
		*-backports*)
			PIN_PRIORITY="${BACKPORTS_PRIORITY}"
			;;

		*)
			PIN_PRIORITY="999"
			;;
	esac

cat >> "/etc/apt/preferences.d/${PROJECT}.pref" << EOF

Package: *
Pin: release o=${PROJECT}, n=${ARCHIVE}
Pin-Priority: ${PIN_PRIORITY}
EOF
}

Configure_ssh_known_hosts ()
{
	KEY="$(cat /usr/share/${PROJECT}/ssh-keys/ssh.${DOMAIN}.pub)"

	if [ ! -e "/etc/ssh/ssh_known_hosts" ]
	then
		mkdir -p /etc/ssh

cat > "/etc/ssh/ssh_known_hosts" << EOF
# /etc/ssh/ssh_known_hosts

@cert-authority *.${DOMAIN} ${KEY}
EOF

	else
		grep -v "^@cert-authority \*.${DOMAIN}" /etc/ssh/ssh_known_hosts > /etc/ssh/ssh_known_hosts.tmp

cat >> "/etc/ssh/ssh_known_hosts.tmp" << EOF
@cert-authority *.${DOMAIN} ${KEY}
EOF

		mv -f /etc/ssh/ssh_known_hosts.tmp /etc/ssh/ssh_known_hosts
	fi
}

Remove_ssh_known_hosts ()
{
	if [ ! -e /etc/ssh/ssh_known_hosts ]
	then
		return
	fi

	# ssh cert-authority
	grep -v "^@cert-authority \*.${DOMAIN}" /etc/ssh/ssh_known_hosts > /etc/ssh/ssh_known_hosts.tmp

	if [ "$(md5sum /etc/ssh/ssh_known_hosts.tmp | cut -d' ' -f1)" = "2a2b4fdd70705b2029b35a24217138e6" ]
	then
		rm -f /etc/ssh/ssh_known_hosts.tmp
		rm -f /etc/ssh/ssh_known_hosts

		rmdir /etc/ssh > /dev/null 2>&1 || true
	else
		mv -f /etc/ssh/ssh_known_hosts.tmp /etc/ssh/ssh_known_hosts
	fi
}

Clean ()
{
	# Remove apt keys
	rm -f "/etc/apt/trusted.gpg.d/${PROJECT}.gpg"

	# Remove apt lists
	rm -f "/etc/apt/sources.list.d/${PROJECT}.list"
}

case "${1}" in
	configure)
		. /usr/share/debconf/confmodule

		db_get ${PROJECT}/archives
		ARCHIVES="$(echo ${RET} | sed -e 's|, | |g')" # multiselect w/ empty

		db_get ${PROJECT}/archive-areas
		ARCHIVE_AREAS="$(echo ${RET:-main} | sed -e 's|, | |g')" # string w/o empty

		db_get ${PROJECT}/mirror
		MIRROR="$(echo ${RET:-${PACKAGES}})" # string w/o empty

		db_stop

		BACKPORTS_PRIORITY="100"

		for ARCHIVE in ${ARCHIVES}
		do
			case "${ARCHIVE}" in
				engywuck|fuchur|graograman|horok|illuan)
					BACKPORTS_PRIORITY="999"
					;;
			esac
		done

		DEBIAN_VERSION="$(cat /etc/debian_version)"

		case "${DEBIAN_VERSION}" in
			10.*|buster/sid)
				;;

			11.*|bullseye/sid)
				;;

			12.*|bookworm/sid)
				;;

			13.*|trixie/sid)
				;;

			14.*|forky/sid)
				;;

			*)
				echo "W: unsupported debian release"

				Remove_apt_sources
				Remove_apt_preferences

				Remove_ssh_known_hosts

				exit 0
				;;
		esac

		# apt
		if [ -n "${ARCHIVES}" ]
		then
			Install_apt_sources
			Install_apt_preferences

			Configure_apt_sources
		else
			Remove_apt_sources
			Remove_apt_preferences
		fi

		# openssh-server
		Configure_ssh_known_hosts

		# upgrading from buster
		Clean
		;;

	abort-upgrade|abort-remove|abort-deconfigure)

		;;

	*)
		echo "postinst called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac

#DEBHELPER#

exit 0