Also create nut user when installing nut-client package and do not delete it on purge anymore (Closes: #682000)

debian/nut-client.postinst

@@ -0,0 +1,60 @@
+#!/bin/sh -e
+
+case "$1" in
+
+  configure)
+
+    # make sure the nut user exists and has correct memberships
+    if ! getent group nut >/dev/null; then
+      addgroup --quiet --system nut
+    fi
+    if ! getent passwd nut >/dev/null; then
+      adduser --quiet --system --ingroup nut --home /var/lib/nut --no-create-home nut
+    elif ! groups nut | grep -qw nut; then
+      adduser nut nut
+    fi
+# for Ubuntu, while waiting for a proper debconf
+#    if ! groups nut | grep -qw dialout; then
+#	adduser nut dialout
+#    fi
+
+    # make sure that conffiles are secured and have the correct ownerships
+    if [ -d /etc/nut/ ] ; then
+      chown root:nut /etc/nut/
+    fi
+    for file in nut.conf upsmon.conf upssched.conf ; do
+        if [ -f /etc/nut/$file ] ; then
+            chown root:nut /etc/nut/$file
+            chmod 640 /etc/nut/$file
+        fi
+    done
+
+    # make sure that /var/run/nut exists and has the correct ownerships
+    if [ ! -d /var/run/nut ] ; then
+        mkdir -p /var/run/nut
+    fi
+    if [ -d /var/run/nut ] ; then
+        chown root:nut /var/run/nut
+        chmod 770 /var/run/nut
+    fi
+
+  abort-upgrade)
+    # do nothing
+    ;;
+
+  abort-remove)
+    # do nothing
+    ;;
+
+  abort-deconfigure)
+    # do nothing
+    ;;
+
+  *)
+    echo "$0: incorrect arguments: $*" >&2
+    exit 1
+    ;;
+
+esac
+
+#DEBHELPER#