if ! getent passwd citadel >/dev/null; then
adduser --system --ingroup citadel --home /var/lib/citadel \
--gecos "Citadel system user" --shell /bin/sh \
if ! getent passwd citadel >/dev/null; then
adduser --system --ingroup citadel --home /var/lib/citadel \
--gecos "Citadel system user" --shell /bin/sh \