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packer-centos-7/scripts/cleanup.sh

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#!/bin/bash -eux
# Zero out the rest of the free space using dd, then delete the written file.
dd if=/dev/zero of=/EMPTY bs=1M
rm -f /EMPTY
# Disable the centos user
chsh -s /bin/false centos
# Add `sync` so Packer doesn't quit too early, before the large file is deleted.
sync