postinst is in lizardfs-common 3.10.4+dfsg-4.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
set -e
case "${1}" in
configure)
if ! getent passwd lizardfs > /dev/null 2>&1; then
adduser --quiet --system --group --disabled-login --no-create-home --home /var/lib/lizardfs lizardfs
fi
chown lizardfs:lizardfs /var/lib/lizardfs
;;
esac
|