#!/bin/bash
#
# lib/nova_plugins/hypervisor-libvirt
# Configure the libvirt hypervisor

# Enable with:
# VIRT_DRIVER=libvirt

# Dependencies:
# ``functions`` file
# ``nova`` configuration

# 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

source $TOP_DIR/lib/nova_plugins/functions-libvirt

# Defaults
# --------

# File injection is disabled by default in Nova.  This will turn it back on.
ENABLE_FILE_INJECTION=${ENABLE_FILE_INJECTION:-False}


# Entry Points
# ------------

# clean_nova_hypervisor - Clean up an installation
function cleanup_nova_hypervisor {
    # This function intentionally left blank
    :
}

# configure_nova_hypervisor - Set config files, create data dirs, etc
function configure_nova_hypervisor {
    configure_libvirt
    iniset $NOVA_CONF libvirt virt_type "$LIBVIRT_TYPE"
    iniset $NOVA_CONF libvirt cpu_mode "none"
    iniset $NOVA_CONF libvirt use_usb_tablet "False"
    iniset $NOVA_CONF libvirt live_migration_uri "qemu+ssh://$STACK_USER@%s/system"
    iniset $NOVA_CONF DEFAULT default_ephemeral_format "ext4"
    iniset $NOVA_CONF DEFAULT compute_driver "libvirt.LibvirtDriver"
    LIBVIRT_FIREWALL_DRIVER=${LIBVIRT_FIREWALL_DRIVER:-"nova.virt.libvirt.firewall.IptablesFirewallDriver"}
    iniset $NOVA_CONF DEFAULT firewall_driver "$LIBVIRT_FIREWALL_DRIVER"
    # Power architecture currently does not support graphical consoles.
    if is_arch "ppc64"; then
        iniset $NOVA_CONF DEFAULT vnc_enabled "false"
    fi

    ENABLE_FILE_INJECTION=$(trueorfalse False ENABLE_FILE_INJECTION)
    if [[ "$ENABLE_FILE_INJECTION" = "True" ]] ; then
        # When libguestfs is available for file injection, enable using
        # libguestfs to inspect the image and figure out the proper
        # partition to inject into.
        iniset $NOVA_CONF libvirt inject_partition '-1'
        iniset $NOVA_CONF libvirt inject_key 'true'
    else
        # File injection is being disabled by default in the near future -
        # disable it here for now to avoid surprises later.
        iniset $NOVA_CONF libvirt inject_partition '-2'
    fi

    if [[ "$LIBVIRT_TYPE" = "parallels" ]]; then
        iniset $NOVA_CONF libvirt connection_uri "parallels+unix:///system"
        iniset $NOVA_CONF libvirt images_type "ploop"
    fi
}

# install_nova_hypervisor() - Install external components
function install_nova_hypervisor {
    install_libvirt

    # Install and configure **LXC** if specified.  LXC is another approach to
    # splitting a system into many smaller parts.  LXC uses cgroups and chroot
    # to simulate multiple systems.
    if [[ "$LIBVIRT_TYPE" == "lxc" ]]; then
        if is_ubuntu; then
            if [[ "$DISTRO" > natty ]]; then
                install_package cgroup-lite
            fi
        else
            ### FIXME(dtroyer): figure this out
            echo "RPM-based cgroup not implemented yet"
            yum_install libcgroup-tools
        fi
    fi
}

# start_nova_hypervisor - Start any required external services
function start_nova_hypervisor {
    # This function intentionally left blank
    :
}

# stop_nova_hypervisor - Stop any external services
function stop_nova_hypervisor {
    # This function intentionally left blank
    :
}


# Restore xtrace
$MY_XTRACE

# Local variables:
# mode: shell-script
# End: