Rollback with Versioning in Vault

rollback.sh

#!/bin/bash
VAULT_PATH=/dev/single
DATETIME=$(date -u +"%Y%m%d%H%M%S")
PREVIOUS=${1:-previous}

echo "Rolling back application config to \"$PREVIOUS\"..."
# Create Tempfiles for writing to...
OLDTMPFILE=`mktemp /tmp/we.XXXXXX` || exit 1
NEWTMPFILE=`mktemp /tmp/we.XXXXXX` || exit 1
# Read our old configuration (and current), and save to tempfiles
vault read -format=json $VAULT_PATH | jq .data >> $OLDTMPFILE
vault read -format=json /versions$VAULT_PATH/$PREVIOUS | \
   jq .data >> $NEWTMPFILE
# Perform the rollback
echo "Saving current config state..."
vault write /versions$VAULT_PATH/$DATETIME @$OLDTMPFILE > /dev/null
vault write /versions$VAULT_PATH/previous @$OLDTMPFILE > /dev/null
vault write $VAULT_PATH @$NEWTMPFILE \
   && rm $OLDTMPFILE $NEWTMPFILE