fix_hosts.sh

#!/bin/bash
# This script will correct the "\n\\n" bug in hosts file
# Src: https://bugs.launchpad.net/tripleo/+bug/1655375
# It will prevent from rebuild and redeployment to
# create a /etc/hosts file with this error.
# The nodes data is saved on swift on the undercloud
# and being pulled by the os-refresh-config process.

if [ "$OS_CLOUDNAME" != "undercloud" ]
then
  echo "You need to source the 'stackrc' undercloud env file"
  exit 1
fi

for o in $(swift list | grep -Px "^ov-.*(Controller|NovaCompute).*$")
do
  object_name=$(swift download $o|awk '{print $1}')
  echo "Got $object_name, going to repair hosts entries"
  sed -i 's/\\n\\\\n/\\n\\n/g' "$object_name"
  echo "Uploading $object_name back to container $o"
  swift upload "$o" "$object_name"
  rm "$object_name"
done