#!/bin/sh -e

__package unattended-upgrades

# in normal circumstances 20auto-upgrades is managed
# by debconf and it can only contain these lines
# https://wiki.debian.org/UnattendedUpgrades

require='__package/unattended-upgrades' \
    __file /etc/apt/apt.conf.d/20auto-upgrades \
        --owner root \
        --group root \
        --mode 644 \
        --source - << EOF
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";
EOF

# lets not write into upstream 50unattended-upgrades file,
# but use our own config files to avoid clashes

ml_conf='/etc/apt/apt.conf.d/51unattended-upgrades-mail'
bl_conf='/etc/apt/apt.conf.d/51unattended-upgrades-blacklist'

if [ -f "$__object/parameter/mail" ]
then
    mail="$( cat "$__object/parameter/mail" )"
else
    mail=''
fi

if [ -n "$mail" ]
then
    if [ -f "$__object/parameter/mail-on-error" ]
    then
        mail_on_error='true'
    else
        mail_on_error='false'
    fi

    __file "$ml_conf" \
        --owner root \
        --group root \
        --mode 644 \
        --source - << EOF
Unattended-Upgrade::Mail "$mail";
Unattended-Upgrade::MailOnlyOnError "$mail_on_error";
EOF

else
    __file "$ml_conf" --state absent
fi

if [ -f "$__object/parameter/blacklist" ]
then
    bl='Unattended-Upgrade::Package-Blacklist {';

    while read -r l
    do
        bl="$( printf '%s\n"%s";\n' "$bl" "$l" )"
    done \
        < "$__object/parameter/blacklist"

    bl="$( printf '%s\n}' "$bl" )"

    echo "$bl" \
        | __file "$bl_conf" \
            --owner root \
            --group root \
            --mode 644 \
            --source -
else
    __file "$bl_conf" --state absent
fi