The sysvinit script uses /etc/default/mandos as an environment file, and supports adding additional server options to a DAEMON_ARGS environment variable. This should be supported by the systemd service, too.
* mandos.service ([Service]/EnvironmentFile): New; set to "/etc/default/mandos ". ([Service]/ExecStart): Append "$DAEMON_ARGS".
if ! dpkg-statoverride --list "/var/lib/mandos" >/dev/null \
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2>&1; then
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chown _mandos:_mandos /var/lib/mandos
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chmod u=rwx,go= /var/lib/mandos
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fi
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if dpkg --compare-versions "$2" eq "1.8.0-1" \
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|| dpkg --compare-versions "$2" eq "1.8.0-1~bpo9+1"; then
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if grep --quiet --regexp='^[[:space:]]*key_id[[:space:]]*=[[:space:]]*[Ee]3[Bb]0[Cc]44298[Ff][Cc]1[Cc]149[Aa][Ff][Bb][Ff]4[Cc]8996[Ff][Bb]92427[Aa][Ee]41[Ee]4649[Bb]934[Cc][Aa]495991[Bb]7852[Bb]855[[:space:]]*$' /etc/mandos/clients.conf; then