# lib/nova_plugins/docker
 # Configure the Docker hypervisor
 
 # Enable with:

 #
 #   VIRT_DRIVER=docker

 
 # Dependencies:

 #
 # - ``functions`` file
 # - ``nova`` and ``glance`` configurations

 
 # install_nova_hypervisor - install any external requirements
 # configure_nova_hypervisor - make configuration changes, including those to other services
 # start_nova_hypervisor - start any external services
 # stop_nova_hypervisor - stop any external services
 # cleanup_nova_hypervisor - remove transient data and cache
 
 # Save trace setting
 MY_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
 
 # Defaults
 # --------
 
 # Set up default directories
 DOCKER_DIR=$DEST/docker
 
 DOCKER_UNIX_SOCKET=/var/run/docker.sock
 DOCKER_PID_FILE=/var/run/docker.pid
 DOCKER_REGISTRY_PORT=${DOCKER_REGISTRY_PORT:-5042}
 

 DOCKER_IMAGE=${DOCKER_IMAGE:-cirros:latest}

 DOCKER_IMAGE_NAME=$DEFAULT_IMAGE_NAME

 DOCKER_REGISTRY_IMAGE=${DOCKER_REGISTRY_IMAGE:-registry:latest}
 DOCKER_REGISTRY_IMAGE_NAME=registry

 DOCKER_REPOSITORY_NAME=${SERVICE_HOST}:${DOCKER_REGISTRY_PORT}/${DOCKER_IMAGE_NAME}
 
 DOCKER_APT_REPO=${DOCKER_APT_REPO:-https://get.docker.io/ubuntu}
 
 
 # Entry Points
 # ------------
 
 # clean_nova_hypervisor - Clean up an installation

 function cleanup_nova_hypervisor {

     stop_service docker
 
     # Clean out work area
     sudo rm -rf /var/lib/docker
 }
 
 # configure_nova_hypervisor - Set config files, create data dirs, etc

 function configure_nova_hypervisor {

     iniset $NOVA_CONF DEFAULT compute_driver docker.DockerDriver
     iniset $GLANCE_API_CONF DEFAULT container_formats ami,ari,aki,bare,ovf,docker
 }
 
 # install_nova_hypervisor() - Install external components

 function install_nova_hypervisor {

     # So far this is Ubuntu only
     if ! is_ubuntu; then
         die $LINENO "Docker is only supported on Ubuntu at this time"
     fi
 
     # Make sure Docker is installed

     if ! is_package_installed lxc-docker; then

         die $LINENO "Docker is not installed.  Please run tools/docker/install_docker.sh"
     fi
 
     local docker_pid
     read docker_pid <$DOCKER_PID_FILE
     if [[ -z $docker_pid ]] || ! ps -p $docker_pid | grep [d]ocker; then
         die $LINENO "Docker not running"
     fi
 }
 
 # start_nova_hypervisor - Start any required external services

 function start_nova_hypervisor {

     local docker_pid
     read docker_pid <$DOCKER_PID_FILE
     if [[ -z $docker_pid ]] || ! ps -p $docker_pid | grep [d]ocker; then
         die $LINENO "Docker not running, start the daemon"
     fi
 
     # Start the Docker registry container
     docker run -d -p ${DOCKER_REGISTRY_PORT}:5000 \
         -e SETTINGS_FLAVOR=openstack -e OS_USERNAME=${OS_USERNAME} \
         -e OS_PASSWORD=${OS_PASSWORD} -e OS_TENANT_NAME=${OS_TENANT_NAME} \
         -e OS_GLANCE_URL="${SERVICE_PROTOCOL}://${GLANCE_HOSTPORT}" \
         -e OS_AUTH_URL=${OS_AUTH_URL} \
         $DOCKER_REGISTRY_IMAGE_NAME ./docker-registry/run.sh
 
     echo "Waiting for docker registry to start..."
     DOCKER_REGISTRY=${SERVICE_HOST}:${DOCKER_REGISTRY_PORT}
     if ! timeout $SERVICE_TIMEOUT sh -c "while ! curl -s $DOCKER_REGISTRY; do sleep 1; done"; then
         die $LINENO "docker-registry did not start"
     fi
 
     # Tag image if not already tagged
     if ! docker images | grep $DOCKER_REPOSITORY_NAME; then
         docker tag $DOCKER_IMAGE_NAME $DOCKER_REPOSITORY_NAME
     fi
 
     # Make sure we copied the image in Glance
     DOCKER_IMAGE=$(glance image-list | egrep " $DOCKER_IMAGE_NAME ")
     if ! is_set DOCKER_IMAGE ; then
         docker push $DOCKER_REPOSITORY_NAME
     fi
 }
 
 # stop_nova_hypervisor - Stop any external services

 function stop_nova_hypervisor {

     # Stop the docker registry container
     docker kill $(docker ps | grep docker-registry | cut -d' ' -f1)
 }
 
 
 # Restore xtrace
 $MY_XTRACE
 
 # Local variables:
 # mode: shell-script
 # End: