make a alternc-slave-specific prerm and preinst that doesn't touch /var/alternc

.gitattributes

@@ -251,12 +251,15 @@ debian/alternc-slave.links -text
 debian/alternc-slave.logrotate -text
 debian/alternc-slave.postinst -text
 debian/alternc-slave.postrm -text
+debian/alternc-slave.prerm -text
 debian/alternc.cron.d -text
 debian/alternc.dirs -text
 debian/alternc.links -text
 debian/alternc.logrotate -text
 debian/alternc.postinst -text
 debian/alternc.postrm -text
+debian/alternc.preinst -text
+debian/alternc.prerm -text
 debian/changelog -text
 debian/compat -text
 debian/config -text
@@ -267,8 +270,6 @@ debian/lintian-override -text
 debian/po/POTFILES.in -text
 debian/po/fr.po -text
 debian/po/templates.pot -text
-debian/preinst -text
-debian/prerm -text
 debian/rules -text
 debian/templates -text
 etc/alternc/apache-ssl.conf -text

debian/alternc-slave.prerm

@@ -0,0 +1,27 @@
+#!/bin/sh -e
+
+# Debian alternc prerm
+# Benjamin Sonntag <benjamin@alternc.org>
+
+case "$1" in
+remove)
+    # remove postfix from the sasl group (might not be user will though...)
+    deluser --quiet postfix sasl || true
+    ;;
+
+upgrade)
+    ;;
+
+purge)
+    ;;
+
+failed-upgrade|abort-install|abort-upgrade|disappear)
+    ;;
+
+*)
+    echo "postrm called with unknown argument '$1'" >&2
+    exit 1
+    ;;
+esac
+
+#DEBHELPER#