Rename instead of delete outdated exam-user directories on localhome-clients

Exam mode don't collect home-directories on localhome clients.
Deleting home of exam-users will result in potential data loss. But keeping
the home under the same name will prevent new exam at the next day.

Solution: Rename home (and /lmn/media/) of user after 12h and delete after 10d.

roles/lmn_localhome/files/rmexam

@@ -0,0 +1,16 @@
+#!/usr/bin/bash
+#
+# rename -exam directories in /home and /lmn/media older than 12h
+# remove -exam.* directories in /home and /lmn/media older than 10d
+#
+
+set -eu
+
+for dir in /home/ /lmn/media ; do
+  if [[ -d "${dir}" ]]; then
+    find "${dir}" -maxdepth 1 -mindepth 1 -name '*-exam' -type d -cmin +720 \
+         -exec bash -c 'mv "$0" "$0".$( date +%Y%m%d-%H%M --reference="$0" )' {} \;
+    find "${dir}" -maxdepth 1 -mindepth 1 -name '*-exam.*' -type d -cmin +14400 \
+	 -exec rm -rf {} \;
+  fi
+done