107a108,169
> azure_apply_new_instance_id_1506187() {
>   # With LP: #1506187, the Azure instance ID detection method was changed
>   # to use the DMI data. In order to prevent existing instances from thinking
>   # they are new instances, the instance ID needs to be updated here.
> 
>   if grep DataSourceAzure /var/lib/cloud/instance/datasource > /dev/null 2>&1; then
> 
>      product_id_f="/sys/devices/virtual/dmi/id/product_uuid"
>      instance_id_f="/var/lib/cloud/data/instance-id"
> 
>      if [ ! -e ${product_id_f} -o ! -e ${instance_id_f} ]; then
>         return 0
>      fi
> 
>      # Get the current instance ID's (new and old)
>      new_instance_id=$(cat ${product_id_f})
>      old_instance_id=$(cat ${instance_id_f})
> 
>      if [ -z "${new_instance_id}" -o -z "${old_instance_id}" ]; then
>         cat <<EOM
> 
> WARNING: Failed to migrate old instance ID to new instance ID.
>     Cloud-init may detect this instance as a new instance upon reboot.
>     Please see: https://bugs.launchpad.net/bug/1506187
> 
> EOM
> 
>      elif [ "${new_instance_id}" != "${old_instance_id}" ]; then
>         cat <<EOM
> 
> AZURE: this instance uses an unstable instance ID. Cloud-init will
>     migrate the instance ID from:
>             ${old_instance_id}
>         to:
>             ${new_instance_id}
>     For more information about this change, please see:
>     https://bugs.launchpad.net/bug/1506187
>     https://azure.microsoft.com/en-us/blog/accessing-and-using-azure-vm-unique-id
> 
> EOM
> 
>         # Write the new instance id
>         echo "${new_instance_id}" > /var/lib/cloud/data/instance-id
> 
>         # Remove the symlink for the instance
>         rm /var/lib/cloud/instance
> 
>         # Rename the old instance id to the new one
>         mv /var/lib/cloud/instances/${old_instance_id} \
>            /var/lib/cloud/instances/${new_instance_id}
> 
>         # Link the old id to the new one, just incase
>         ln -s /var/lib/cloud/instances/${new_instance_id} \
>               /var/lib/cloud/instances/${old_instance_id}
> 
>         # Make the active instance the new id
>         ln -s /var/lib/cloud/instances/${new_instance_id} \
>               /var/lib/cloud/instance
>   fi
> fi
> }
> 
133c195
<       fi
---
>         fi
162c224,228
<       
---
> 
>        # 0.7.7-bzr1556 introduced new instance ID source for Azure
>        if dpkg --compare-versions "$2" le "0.7.7-bzr1556-0ubuntu1"; then
>           azure_apply_new_instance_id_1506187
>        fi