roles-lists: Initial version of role

Add support for archiving mailing lists from roles.

roles/roles-lists/files/archiver.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+function err {
+    echo "$*" | mail -s "archiver: mail archiving failed" root
+    exit 1
+}
+
+_group=$1
+_list=$2
+
+if [ -z "$_group" ] || [ -z "$_list" ]; then
+    echo "Usage: $(basename "$0") <group> <list>"
+    exit 1
+fi
+
+_dir="/roles/${_group}/library/archive/${_list}"
+_mbox="${_dir}/$(date +%Y-%m)"
+
+if [ ! -d "$_dir" ]; then
+    if ! mkdir -p "$_dir" ; then
+        err "ERROR: Failed to create archive directory '${_dir}'"
+    fi
+fi
+
+if ! "/usr/bin/spamc" >> "${_mbox}" ; then
+    err "ERROR: Failed to archive mail into '${_mbox}'"
+fi