lib/cinder

#!/bin/bash
#
# lib/cinder
# Install and start **Cinder** volume service

# Dependencies:
#
# - functions
# - DEST, DATA_DIR, STACK_USER must be defined
# - SERVICE_{TENANT_NAME|PASSWORD} must be defined
# - ``KEYSTONE_TOKEN_FORMAT`` must be defined

# stack.sh
# ---------
# - install_cinder
# - configure_cinder
# - init_cinder
# - start_cinder
# - stop_cinder
# - cleanup_cinder

# Save trace setting
_XTRACE_CINDER=$(set +o | grep xtrace)
set +o xtrace


# Defaults
# --------

# set up default driver
CINDER_DRIVER=${CINDER_DRIVER:-default}
CINDER_PLUGINS=$TOP_DIR/lib/cinder_plugins
CINDER_BACKENDS=$TOP_DIR/lib/cinder_backends

# grab plugin config if specified via cinder_driver
if [[ -r $CINDER_PLUGINS/$CINDER_DRIVER ]]; then
    source $CINDER_PLUGINS/$CINDER_DRIVER
fi

# set up default directories
GITDIR["python-cinderclient"]=$DEST/python-cinderclient
GITDIR["python-brick-cinderclient-ext"]=$DEST/python-brick-cinderclient-ext
CINDER_DIR=$DEST/cinder

# Cinder virtual environment
if [[ ${USE_VENV} = True ]]; then
    PROJECT_VENV["cinder"]=${CINDER_DIR}.venv
    CINDER_BIN_DIR=${PROJECT_VENV["cinder"]}/bin
else
    CINDER_BIN_DIR=$(get_python_exec_prefix)
fi

CINDER_STATE_PATH=${CINDER_STATE_PATH:=$DATA_DIR/cinder}
CINDER_AUTH_CACHE_DIR=${CINDER_AUTH_CACHE_DIR:-/var/cache/cinder}

CINDER_CONF_DIR=/etc/cinder
CINDER_CONF=$CINDER_CONF_DIR/cinder.conf
CINDER_API_PASTE_INI=$CINDER_CONF_DIR/api-paste.ini

# Public facing bits
if is_service_enabled tls-proxy; then
    CINDER_SERVICE_PROTOCOL="https"
fi
CINDER_SERVICE_HOST=${CINDER_SERVICE_HOST:-$SERVICE_HOST}
CINDER_SERVICE_PORT=${CINDER_SERVICE_PORT:-8776}
CINDER_SERVICE_PORT_INT=${CINDER_SERVICE_PORT_INT:-18776}
CINDER_SERVICE_PROTOCOL=${CINDER_SERVICE_PROTOCOL:-$SERVICE_PROTOCOL}
CINDER_SERVICE_LISTEN_ADDRESS=${CINDER_SERVICE_LISTEN_ADDRESS:-$SERVICE_LISTEN_ADDRESS}

# What type of LVM device should Cinder use for LVM backend
# Defaults to default, which is thick, the other valid choice
# is thin, which as the name implies utilizes lvm thin provisioning.
# Thinly provisioned LVM volumes may be more efficient when using the Cinder
# image cache, but there are also known race failures with volume snapshots
# and thinly provisioned LVM volumes, see bug 1642111 for details.
CINDER_LVM_TYPE=${CINDER_LVM_TYPE:-default}

# Default backends
# The backend format is type:name where type is one of the supported backend
# types (lvm, nfs, etc) and name is the identifier used in the Cinder
# configuration and for the volume type name.  Multiple backends are
# comma-separated.
# The old ``CINDER_MULTI_LVM_BACKEND=True`` setting had a default of:
# CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:lvmdriver-1,lvm:lvmdriver-2}
CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:lvmdriver-1}

CINDER_VOLUME_CLEAR=${CINDER_VOLUME_CLEAR:-${CINDER_VOLUME_CLEAR_DEFAULT:-zero}}
CINDER_VOLUME_CLEAR=$(echo ${CINDER_VOLUME_CLEAR} | tr '[:upper:]' '[:lower:]')

# Cinder reports allocations back to the scheduler on periodic intervals
# it turns out we can get an "out of space" issue when we run tests too
# quickly just because cinder didn't realize we'd freed up resources.
# Make this configurable so that devstack-gate/tempest can set it to
# less than the 60 second default
# https://bugs.launchpad.net/cinder/+bug/1180976
CINDER_PERIODIC_INTERVAL=${CINDER_PERIODIC_INTERVAL:-60}

CINDER_ISCSI_HELPER=${CINDER_ISCSI_HELPER:-tgtadm}

# Toggle for deploying Cinder under HTTPD + mod_wsgi
CINDER_USE_MOD_WSGI=${CINDER_USE_MOD_WSGI:-False}

# Source the enabled backends
if is_service_enabled c-vol && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
    for be in ${CINDER_ENABLED_BACKENDS//,/ }; do
        be_type=${be%%:*}
        be_name=${be##*:}
        if [[ -r $CINDER_BACKENDS/${be_type} ]]; then
            source $CINDER_BACKENDS/${be_type}
        fi
    done
fi

# Environment variables to configure the image-volume cache
CINDER_IMG_CACHE_ENABLED=${CINDER_IMG_CACHE_ENABLED:-True}

# For limits, if left unset, it will use cinder defaults of 0 for unlimited
CINDER_IMG_CACHE_SIZE_GB=${CINDER_IMG_CACHE_SIZE_GB:-}
CINDER_IMG_CACHE_SIZE_COUNT=${CINDER_IMG_CACHE_SIZE_COUNT:-}

# Configure which cinder backends will have the image-volume cache, this takes the same
# form as the CINDER_ENABLED_BACKENDS config option. By default it will
# enable the cache for all cinder backends.
CINDER_CACHE_ENABLED_FOR_BACKENDS=${CINDER_CACHE_ENABLED_FOR_BACKENDS:-$CINDER_ENABLED_BACKENDS}

# Functions
# ---------

# Test if any Cinder services are enabled
# is_cinder_enabled
function is_cinder_enabled {
    [[ ,${ENABLED_SERVICES} =~ ,"c-" ]] && return 0
    return 1
}

# _cinder_cleanup_apache_wsgi() - Remove wsgi files, disable and remove apache vhost file
function _cinder_cleanup_apache_wsgi {
    sudo rm -f $(apache_site_config_for osapi-volume)
}

# cleanup_cinder() - Remove residual data files, anything left over from previous
# runs that a clean run would need to clean up
function cleanup_cinder {
    # ensure the volume group is cleared up because fails might
    # leave dead volumes in the group
    if [ "$CINDER_ISCSI_HELPER" = "tgtadm" ]; then
        local targets
        targets=$(sudo tgtadm --op show --mode target)
        if [ $? -ne 0 ]; then
            # If tgt driver isn't running this won't work obviously
            # So check the response and restart if need be
            echo "tgtd seems to be in a bad state, restarting..."
            if is_ubuntu; then
                restart_service tgt
            else
                restart_service tgtd
            fi
            targets=$(sudo tgtadm --op show --mode target)
        fi

        if [[ -n "$targets" ]]; then
            local iqn_list=( $(grep --no-filename -r iqn $SCSI_PERSIST_DIR | sed 's/<target //' | sed 's/>//') )
            for i in "${iqn_list[@]}"; do
                echo removing iSCSI target: $i
                sudo tgt-admin --delete $i
            done
        fi

        if is_ubuntu; then
            stop_service tgt
        else
            stop_service tgtd
        fi
    else
        sudo cinder-rtstool get-targets | sudo xargs -rn 1 cinder-rtstool delete
    fi

    if is_service_enabled c-vol && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
        local be be_name be_type
        for be in ${CINDER_ENABLED_BACKENDS//,/ }; do
            be_type=${be%%:*}
            be_name=${be##*:}
            if type cleanup_cinder_backend_${be_type} >/dev/null 2>&1; then
                cleanup_cinder_backend_${be_type} ${be_name}
            fi
        done
    fi

    if [ "$CINDER_USE_MOD_WSGI" == "True" ]; then
        _cinder_cleanup_apache_wsgi
    fi
}

# _cinder_config_apache_wsgi() - Set WSGI config files
function _cinder_config_apache_wsgi {
    local cinder_apache_conf
    cinder_apache_conf=$(apache_site_config_for osapi-volume)
    local cinder_ssl=""
    local cinder_certfile=""
    local cinder_keyfile=""
    local cinder_api_port=$CINDER_SERVICE_PORT
    local venv_path=""

    if [[ ${USE_VENV} = True ]]; then
        venv_path="python-path=${PROJECT_VENV["cinder"]}/lib/python2.7/site-packages"
    fi

    # copy proxy vhost file
    sudo cp $FILES/apache-cinder-api.template $cinder_apache_conf
    sudo sed -e "
        s|%PUBLICPORT%|$cinder_api_port|g;
        s|%APACHE_NAME%|$APACHE_NAME|g;
        s|%APIWORKERS%|$API_WORKERS|g
        s|%CINDER_BIN_DIR%|$CINDER_BIN_DIR|g;
        s|%SSLENGINE%|$cinder_ssl|g;
        s|%SSLCERTFILE%|$cinder_certfile|g;
        s|%SSLKEYFILE%|$cinder_keyfile|g;
        s|%USER%|$STACK_USER|g;
        s|%VIRTUALENV%|$venv_path|g
    " -i $cinder_apache_conf
}

# configure_cinder() - Set config files, create data dirs, etc
function configure_cinder {
    sudo install -d -o $STACK_USER -m 755 $CINDER_CONF_DIR

    cp -p $CINDER_DIR/etc/cinder/policy.json $CINDER_CONF_DIR

    rm -f $CINDER_CONF

    configure_rootwrap cinder

    if [[ -f "$CINDER_DIR/etc/cinder/resource_filters.json" ]]; then
        cp -p "$CINDER_DIR/etc/cinder/resource_filters.json" "$CINDER_CONF_DIR/resource_filters.json"
    fi

    cp $CINDER_DIR/etc/cinder/api-paste.ini $CINDER_API_PASTE_INI

    inicomment $CINDER_API_PASTE_INI filter:authtoken auth_host
    inicomment $CINDER_API_PASTE_INI filter:authtoken auth_port
    inicomment $CINDER_API_PASTE_INI filter:authtoken auth_protocol
    inicomment $CINDER_API_PASTE_INI filter:authtoken cafile
    inicomment $CINDER_API_PASTE_INI filter:authtoken admin_tenant_name
    inicomment $CINDER_API_PASTE_INI filter:authtoken admin_user
    inicomment $CINDER_API_PASTE_INI filter:authtoken admin_password
    inicomment $CINDER_API_PASTE_INI filter:authtoken signing_dir

    configure_auth_token_middleware $CINDER_CONF cinder $CINDER_AUTH_CACHE_DIR

    # Change the default nova_catalog_info and nova_catalog_admin_info values in
    # cinder so that the service name cinder is searching for matches that set for
    # nova in keystone.
    if [[ -n "$CINDER_NOVA_CATALOG_INFO" ]]; then
        iniset $CINDER_CONF DEFAULT nova_catalog_info $CINDER_NOVA_CATALOG_INFO
    fi
    if [[ -n "$CINDER_NOVA_CATALOG_ADMIN_INFO" ]]; then
        iniset $CINDER_CONF DEFAULT nova_catalog_admin_info $CINDER_NOVA_CATALOG_ADMIN_INFO
    fi

    iniset $CINDER_CONF DEFAULT auth_strategy keystone
    iniset $CINDER_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL

    iniset $CINDER_CONF DEFAULT iscsi_helper "$CINDER_ISCSI_HELPER"
    iniset $CINDER_CONF database connection `database_connection_url cinder`
    iniset $CINDER_CONF DEFAULT api_paste_config $CINDER_API_PASTE_INI
    iniset $CINDER_CONF DEFAULT rootwrap_config "$CINDER_CONF_DIR/rootwrap.conf"
    iniset $CINDER_CONF DEFAULT osapi_volume_extension cinder.api.contrib.standard_extensions
    iniset $CINDER_CONF DEFAULT osapi_volume_listen $CINDER_SERVICE_LISTEN_ADDRESS
    iniset $CINDER_CONF DEFAULT state_path $CINDER_STATE_PATH
    iniset $CINDER_CONF oslo_concurrency lock_path $CINDER_STATE_PATH
    iniset $CINDER_CONF DEFAULT periodic_interval $CINDER_PERIODIC_INTERVAL
    iniset $CINDER_CONF DEFAULT my_ip "$HOST_IP"

    iniset $CINDER_CONF DEFAULT os_region_name "$REGION_NAME"

    iniset $CINDER_CONF key_manager api_class cinder.keymgr.conf_key_mgr.ConfKeyManager

    if is_service_enabled c-vol && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
        local enabled_backends=""
        local default_name=""
        local be be_name be_type
        for be in ${CINDER_ENABLED_BACKENDS//,/ }; do
            be_type=${be%%:*}
            be_name=${be##*:}
            if type configure_cinder_backend_${be_type} >/dev/null 2>&1; then
                configure_cinder_backend_${be_type} ${be_name}
            fi
            if [[ -z "$default_name" ]]; then
                default_name=$be_name
            fi
            enabled_backends+=$be_name,
        done
        iniset $CINDER_CONF DEFAULT enabled_backends ${enabled_backends%,*}
        if [[ -n "$default_name" ]]; then
            iniset $CINDER_CONF DEFAULT default_volume_type ${default_name}
        fi
        configure_cinder_image_volume_cache
    fi

    if is_service_enabled swift; then
        iniset $CINDER_CONF DEFAULT backup_swift_url "$SWIFT_SERVICE_PROTOCOL://$SERVICE_HOST:$SWIFT_DEFAULT_BIND_PORT/v1/AUTH_"
    fi

    if is_service_enabled ceilometer; then
        iniset $CINDER_CONF oslo_messaging_notifications driver "messagingv2"
    fi

    if is_service_enabled tls-proxy; then
        # Set the service port for a proxy to take the original
        iniset $CINDER_CONF DEFAULT osapi_volume_listen_port $CINDER_SERVICE_PORT_INT
        iniset $CINDER_CONF DEFAULT public_endpoint $CINDER_SERVICE_PROTOCOL://$CINDER_SERVICE_HOST:$CINDER_SERVICE_PORT
        iniset $CINDER_CONF DEFAULT osapi_volume_base_URL $CINDER_SERVICE_PROTOCOL://$CINDER_SERVICE_HOST:$CINDER_SERVICE_PORT
    fi

    if [ "$SYSLOG" != "False" ]; then
        iniset $CINDER_CONF DEFAULT use_syslog True
    fi

    iniset_rpc_backend cinder $CINDER_CONF

    iniset $CINDER_CONF DEFAULT volume_clear $CINDER_VOLUME_CLEAR

    # Format logging
    setup_logging $CINDER_CONF $CINDER_USE_MOD_WSGI

    if [ "$CINDER_USE_MOD_WSGI" == "True" ]; then
        _cinder_config_apache_wsgi
    fi

    if [[ -r $CINDER_PLUGINS/$CINDER_DRIVER ]]; then
        configure_cinder_driver
    fi

    iniset $CINDER_CONF DEFAULT osapi_volume_workers "$API_WORKERS"

    iniset $CINDER_CONF DEFAULT glance_api_servers "${GLANCE_SERVICE_PROTOCOL}://${GLANCE_HOSTPORT}"
    if is_service_enabled tls-proxy; then
        iniset $CINDER_CONF DEFAULT glance_protocol https
        iniset $CINDER_CONF DEFAULT glance_ca_certificates_file $SSL_BUNDLE_FILE
    fi

    if [ "$GLANCE_V1_ENABLED" != "True" ]; then
        iniset $CINDER_CONF DEFAULT glance_api_version 2
    fi

    # Set os_privileged_user credentials (used for os-assisted-snapshots)
    iniset $CINDER_CONF DEFAULT os_privileged_user_name nova
    iniset $CINDER_CONF DEFAULT os_privileged_user_password "$SERVICE_PASSWORD"
    iniset $CINDER_CONF DEFAULT os_privileged_user_tenant "$SERVICE_PROJECT_NAME"
    iniset $CINDER_CONF DEFAULT graceful_shutdown_timeout "$SERVICE_GRACEFUL_SHUTDOWN_TIMEOUT"

    if [[ ! -z "$CINDER_COORDINATION_URL" ]]; then
        iniset $CINDER_CONF coordination backend_url "$CINDER_COORDINATION_URL"
    elif is_service_enabled etcd3; then
        iniset $CINDER_CONF coordination backend_url "etcd3+http://${SERVICE_HOST}:2379"
    fi
}

# create_cinder_accounts() - Set up common required cinder accounts

# Tenant               User       Roles
# ------------------------------------------------------------------
# service              cinder     admin        # if enabled

# Migrated from keystone_data.sh
function create_cinder_accounts {

    # Cinder
    if [[ "$ENABLED_SERVICES" =~ "c-api" ]]; then

        create_service_user "cinder"

        get_or_create_service "cinder" "volume" "Cinder Volume Service"
        get_or_create_endpoint \
            "volume" \
            "$REGION_NAME" \
            "$CINDER_SERVICE_PROTOCOL://$CINDER_SERVICE_HOST:$CINDER_SERVICE_PORT/v1/\$(project_id)s"

        get_or_create_service "cinderv2" "volumev2" "Cinder Volume Service V2"
        get_or_create_endpoint \
            "volumev2" \
            "$REGION_NAME" \
            "$CINDER_SERVICE_PROTOCOL://$CINDER_SERVICE_HOST:$CINDER_SERVICE_PORT/v2/\$(project_id)s"

        get_or_create_service "cinderv3" "volumev3" "Cinder Volume Service V3"
        get_or_create_endpoint \
            "volumev3" \
            "$REGION_NAME" \
            "$CINDER_SERVICE_PROTOCOL://$CINDER_SERVICE_HOST:$CINDER_SERVICE_PORT/v3/\$(project_id)s"

        configure_cinder_internal_tenant
    fi
}

# create_cinder_cache_dir() - Part of the init_cinder() process
function create_cinder_cache_dir {
    # Create cache dir
    sudo install -d -o $STACK_USER $CINDER_AUTH_CACHE_DIR
    rm -f $CINDER_AUTH_CACHE_DIR/*
}

# init_cinder() - Initialize database and volume group
function init_cinder {
    if is_service_enabled $DATABASE_BACKENDS; then
        # (Re)create cinder database
        recreate_database cinder

        # Migrate cinder database
        $CINDER_BIN_DIR/cinder-manage --config-file $CINDER_CONF db sync
    fi

    if is_service_enabled c-vol && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
        local be be_name be_type
        for be in ${CINDER_ENABLED_BACKENDS//,/ }; do
            be_type=${be%%:*}
            be_name=${be##*:}
            if type init_cinder_backend_${be_type} >/dev/null 2>&1; then
                # Always init the default volume group for lvm.
                if [[ "$be_type" == "lvm" ]]; then
                    init_default_lvm_volume_group
                fi
                init_cinder_backend_${be_type} ${be_name}
            fi
        done
    fi

    mkdir -p $CINDER_STATE_PATH/volumes
    create_cinder_cache_dir
}

# install_cinder() - Collect source and prepare
function install_cinder {
    git_clone $CINDER_REPO $CINDER_DIR $CINDER_BRANCH
    setup_develop $CINDER_DIR
    if [ "$CINDER_ISCSI_HELPER" = "tgtadm" ]; then
        if is_fedora; then
            install_package scsi-target-utils
        else
            install_package tgt
        fi
    fi

    if [ "$CINDER_USE_MOD_WSGI" == "True" ]; then
        install_apache_wsgi
    fi
}

# install_cinderclient() - Collect source and prepare
function install_cinderclient {
    if use_library_from_git "python-brick-cinderclient-ext"; then
        git_clone_by_name "python-brick-cinderclient-ext"
        setup_dev_lib "python-brick-cinderclient-ext"
    fi

    if use_library_from_git "python-cinderclient"; then
        git_clone_by_name "python-cinderclient"
        setup_dev_lib "python-cinderclient"
        sudo install -D -m 0644 -o $STACK_USER {${GITDIR["python-cinderclient"]}/tools/,/etc/bash_completion.d/}cinder.bash_completion
    fi
}

# apply config.d approach for cinder volumes directory
function _configure_tgt_for_config_d {
    if [[ ! -d /etc/tgt/stack.d/ ]]; then
        sudo ln -sf $CINDER_STATE_PATH/volumes /etc/tgt/stack.d
    fi
    if ! grep -q "include /etc/tgt/stack.d/*" /etc/tgt/targets.conf; then
        echo "include /etc/tgt/stack.d/*" | sudo tee -a /etc/tgt/targets.conf
    fi
}

# start_cinder() - Start running processes, including screen
function start_cinder {
    local service_port=$CINDER_SERVICE_PORT
    local service_protocol=$CINDER_SERVICE_PROTOCOL
    if is_service_enabled tls-proxy; then
        service_port=$CINDER_SERVICE_PORT_INT
        service_protocol="http"
    fi
    if [ "$CINDER_ISCSI_HELPER" = "tgtadm" ]; then
        if is_service_enabled c-vol; then
            # Delete any old stack.conf
            sudo rm -f /etc/tgt/conf.d/stack.conf
            _configure_tgt_for_config_d
            if is_ubuntu; then
                sudo service tgt restart
            elif is_suse; then
                # NOTE(dmllr): workaround restart bug
                # https://bugzilla.suse.com/show_bug.cgi?id=934642
                stop_service tgtd
                start_service tgtd
            else
                restart_service tgtd
            fi
            # NOTE(gfidente): ensure tgtd is running in debug mode
            sudo tgtadm --mode system --op update --name debug --value on
        fi
    fi

    if [ "$CINDER_USE_MOD_WSGI" == "True" ]; then
        enable_apache_site osapi-volume
        restart_apache_server
        tail_log c-api /var/log/$APACHE_NAME/c-api.log
    else
        run_process c-api "$CINDER_BIN_DIR/cinder-api --config-file $CINDER_CONF"
    fi

    echo "Waiting for Cinder API to start..."
    if ! wait_for_service $SERVICE_TIMEOUT $service_protocol://$CINDER_SERVICE_HOST:$service_port; then
        die $LINENO "c-api did not start"
    fi

    run_process c-sch "$CINDER_BIN_DIR/cinder-scheduler --config-file $CINDER_CONF"
    run_process c-bak "$CINDER_BIN_DIR/cinder-backup --config-file $CINDER_CONF"
    run_process c-vol "$CINDER_BIN_DIR/cinder-volume --config-file $CINDER_CONF"

    # NOTE(jdg): For cinder, startup order matters.  To ensure that repor_capabilities is received
    # by the scheduler start the cinder-volume service last (or restart it) after the scheduler
    # has started.  This is a quick fix for lp bug/1189595

    # Start proxies if enabled
    if is_service_enabled c-api && is_service_enabled tls-proxy; then
        start_tls_proxy cinder '*' $CINDER_SERVICE_PORT $CINDER_SERVICE_HOST $CINDER_SERVICE_PORT_INT
    fi
}

# stop_cinder() - Stop running processes
function stop_cinder {
    if [ "$CINDER_USE_MOD_WSGI" == "True" ]; then
        disable_apache_site osapi-volume
        restart_apache_server
    else
        stop_process c-api
    fi

    # Kill the cinder screen windows
    local serv
    for serv in c-bak c-sch c-vol; do
        stop_process $serv
    done
}

# create_volume_types() - Create Cinder's configured volume types
function create_volume_types {
    # Create volume types
    if is_service_enabled c-api && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
        local be be_name
        for be in ${CINDER_ENABLED_BACKENDS//,/ }; do
            be_name=${be##*:}
            openstack --os-region-name="$REGION_NAME" volume type create --property volume_backend_name="${be_name}" ${be_name}
        done
    fi
}

# Compatibility for Grenade

function create_cinder_volume_group {
    # During a transition period Grenade needs to have this function defined
    # It is effectively a no-op in the Grenade 'target' use case
    :
}

function configure_cinder_internal_tenant {
    # Re-use the Cinder service account for simplicity.
    iniset $CINDER_CONF DEFAULT cinder_internal_tenant_project_id $(get_or_create_project $SERVICE_PROJECT_NAME)
    iniset $CINDER_CONF DEFAULT cinder_internal_tenant_user_id $(get_or_create_user "cinder")
}

function configure_cinder_image_volume_cache {
    # Expect CINDER_CACHE_ENABLED_FOR_BACKENDS to be a list of backends
    # similar to CINDER_ENABLED_BACKENDS with NAME:TYPE where NAME will
    # be the backend specific configuration stanza in cinder.conf.
    for be in ${CINDER_CACHE_ENABLED_FOR_BACKENDS//,/ }; do
        local be_name=${be##*:}

        iniset $CINDER_CONF $be_name image_volume_cache_enabled $CINDER_IMG_CACHE_ENABLED

        if [[ -n $CINDER_IMG_CACHE_SIZE_GB ]]; then
            iniset $CINDER_CONF $be_name image_volume_cache_max_size_gb $CINDER_IMG_CACHE_SIZE_GB
        fi

        if [[ -n $CINDER_IMG_CACHE_SIZE_COUNT ]]; then
            iniset $CINDER_CONF $be_name image_volume_cache_max_count $CINDER_IMG_CACHE_SIZE_COUNT
        fi
    done
}


# Restore xtrace
$_XTRACE_CINDER

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