From f445ebb0285dd30c01449691328e7c11194be0b7 Mon Sep 17 00:00:00 2001
From: Mike Appleby <mike@app.leby.org>
Date: Wed, 2 Aug 2017 11:24:50 -0500
Subject: Write zeros to disk to improve disk compression

Write zeros to a file on the root partition until the filesystem is
full, then unlink the file. Packer will compress the disk as part of
the build, resulting in smaller final disk image.
---
 provision/cleanup.sh | 6 ++++++
 1 file changed, 6 insertions(+)
 mode change 100644 => 100755 provision/cleanup.sh

diff --git a/provision/cleanup.sh b/provision/cleanup.sh
old mode 100644
new mode 100755
index b8a2336..29da429
--- a/provision/cleanup.sh
+++ b/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
-- 
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