[Unit]
Description=Allowing already installed printers for foomatic-rip
ConditionPathIsDirectory=/etc/foomatic/hashes.d
ConditionDirectoryNotEmpty=!/etc/foomatic/hashes.d

[Service]
Type=oneshot
ExecStart=bash -c /usr/libexec/cups-filters/posttrans.sh

[Install]
WantedBy=multi-user.target