# lib/nova_plugins/hypervisor-libvirt
# Configure the libvirt hypervisor

# Enable with:
# VIRT_DRIVER=libvirt

# Dependencies:
# ``functions`` file
# ``nova`` configuration
# ``STACK_USER`` has to be defined

# 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
# --------


# 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() {
    if is_service_enabled neutron && is_neutron_ovs_base_plugin && ! sudo grep -q '^cgroup_device_acl' $QEMU_CONF; then
        # Add /dev/net/tun to cgroup_device_acls, needed for type=ethernet interfaces
        cat <<EOF | sudo tee -a $QEMU_CONF
cgroup_device_acl = [
    "/dev/null", "/dev/full", "/dev/zero",
    "/dev/random", "/dev/urandom",
    "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
    "/dev/rtc", "/dev/hpet","/dev/net/tun",
]
EOF
    fi

    if is_ubuntu; then
        LIBVIRT_DAEMON=libvirt-bin
    else
        LIBVIRT_DAEMON=libvirtd
    fi

    if is_fedora || is_suse; then
        if is_fedora && [[ $DISTRO =~ (rhel6) || "$os_RELEASE" -le "17" ]]; then
            sudo bash -c "cat <<EOF >/etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[libvirt Management Access]
Identity=unix-group:$LIBVIRT_GROUP
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
EOF"
        elif is_suse && [[ $os_RELEASE = 12.2 || "$os_VENDOR" = "SUSE LINUX" ]]; then
            # openSUSE < 12.3 or SLE
            # Work around the fact that polkit-default-privs overrules pklas
            # with 'unix-group:$group'.
            sudo bash -c "cat <<EOF >/etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[libvirt Management Access]
Identity=unix-user:$STACK_USER
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
EOF"
        else
            # Starting with fedora 18 and opensuse-12.3 enable stack-user to
            # virsh -c qemu:///system by creating a policy-kit rule for
            # stack-user using the new Javascript syntax
            rules_dir=/etc/polkit-1/rules.d
            sudo mkdir -p $rules_dir
            sudo bash -c "cat <<EOF > $rules_dir/50-libvirt-$STACK_USER.rules
polkit.addRule(function(action, subject) {
    if (action.id == 'org.libvirt.unix.manage' &&
        subject.user == '"$STACK_USER"') {
        return polkit.Result.YES;
    }
});
EOF"
            unset rules_dir
        fi
    fi

    # The user that nova runs as needs to be member of **libvirtd** group otherwise
    # nova-compute will be unable to use libvirt.
    if ! getent group $LIBVIRT_GROUP >/dev/null; then
        sudo groupadd $LIBVIRT_GROUP
    fi
    add_user_to_group $STACK_USER $LIBVIRT_GROUP

    # libvirt detects various settings on startup, as we potentially changed
    # the system configuration (modules, filesystems), we need to restart
    # libvirt to detect those changes.
    restart_service $LIBVIRT_DAEMON

    iniset $NOVA_CONF DEFAULT libvirt_type "$LIBVIRT_TYPE"
    iniset $NOVA_CONF DEFAULT libvirt_cpu_mode "none"
    iniset $NOVA_CONF DEFAULT use_usb_tablet "False"
    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
}

# install_nova_hypervisor() - Install external components
function install_nova_hypervisor() {
    if is_ubuntu; then
        install_package kvm
        install_package libvirt-bin
        install_package python-libvirt
    elif is_fedora || is_suse; then
        install_package kvm
        install_package libvirt
        install_package libvirt-python
    fi

    # 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: