preinst is in jabber-muc 0.8-4.
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 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #!/bin/sh
set -e
case "$1" in
upgrade)
;;
install|abort-upgrade)
;;
*)
echo "preinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
if ! getent group | grep -q "^jabber:"
then
addgroup --system jabber
fi
if ! getent passwd | grep -q "^jabber:"
then
adduser --system --home /var/lib/jabberd2 --no-create-home \
--quiet --disabled-password --ingroup jabber jabber
fi
exit 0
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