preinst is in fs-uae-netplay-server 2.8.4+dfsg-1.
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.
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set -e
case "$1" in
install|upgrade)
# If the package has default file it could be sourced, so that
# the local admin can overwrite the defaults
#[ -f "/etc/default/packagename" ] && . /etc/default/fixme
# Sane defaults:
[ -z "$SERVER_HOME" ] && SERVER_HOME=/var/cache/fs-uae-netplay-server
[ -z "$SERVER_USER" ] && SERVER_USER=fs-uae-netplay-server
[ -z "$SERVER_NAME" ] && SERVER_NAME="FS-UAE Netplay Server"
[ -z "$SERVER_GROUP" ] && SERVER_GROUP=fs-uae-netplay-server
# Groups that the user will be added to, if undefined, then none.
ADDGROUP=""
# create user to avoid running server as root
# 1. create group if not existing
if ! getent group | grep -q "^$SERVER_GROUP:" ; then
echo -n "Adding group $SERVER_GROUP.."
addgroup --quiet --system $SERVER_GROUP 2>/dev/null ||true
echo "..done"
fi
# 2. create homedir if not existing
test -d $SERVER_HOME || mkdir $SERVER_HOME
# 3. create user if not existing
if ! getent passwd | grep -q "^$SERVER_USER:"; then
echo -n "Adding system user $SERVER_USER.."
adduser --quiet \
--system \
--ingroup $SERVER_GROUP \
--no-create-home \
--disabled-password \
$SERVER_USER 2>/dev/null || true
echo "..done"
fi
# 4. adjust passwd entry
usermod -c "$SERVER_NAME" \
-d $SERVER_HOME \
-g $SERVER_GROUP \
$SERVER_USER
# 5. adjust file and directory permissions
if ! dpkg-statoverride --list $SERVER_HOME >/dev/null
then
chown -R $SERVER_USER:$SERVER_GROUP $SERVER_HOME
chmod u=rwx,g=rxs,o= $SERVER_HOME
fi
# 6. Add the user to the ADDGROUP group
if test -n "$ADDGROUP"
then
if ! groups $SERVER_USER | cut -d: -f2 | \
grep -qw $ADDGROUP; then
adduser $SERVER_USER $ADDGROUP
fi
fi
mkdir -p /var/log/fs-uae-netplay-server
chown $SERVER_USER /var/log/fs-uae-netplay-server
chgrp $SERVER_GROUP /var/log/fs-uae-netplay-server
;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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