Merge pull request #17 from appleby/improve-disk-compaction

Write zeros to disk to improve disk compression

provision/cleanup.sh

@@ -4,3 +4,9 @@ set -e
 set -x
 
 yes | sudo pacman -Scc
+
+# Write zeros to improve virtual disk compaction.
+zerofile=$(/usr/bin/mktemp /zerofile.XXXXX)
+dd if=/dev/zero of="$zerofile" bs=1M || true
+rm -f "$zerofile"
+sync