# lib/nova
# Functions to control the configuration and operation of the XXXX service

# Dependencies:
# ``functions`` file
# ``DEST``, ``DATA_DIR`` must be defined
# ``SERVICE_{TENANT_NAME|PASSWORD}`` must be defined
# ``LIBVIRT_TYPE`` must be defined
# ``INSTANCE_NAME_PREFIX``, ``VOLUME_NAME_PREFIX`` must be defined

# ``stack.sh`` calls the entry points in this order:
#
# install_nova
# configure_nova
# init_nova
# start_nova
# stop_nova
# cleanup_nova

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


# Defaults
# --------

# Set up default directories
NOVA_DIR=$DEST/nova
NOVACLIENT_DIR=$DEST/python-novaclient
NOVA_STATE_PATH=${NOVA_STATE_PATH:=$DATA_DIR/nova}
# INSTANCES_PATH is the previous name for this
NOVA_INSTANCES_PATH=${NOVA_INSTANCES_PATH:=${INSTANCES_PATH:=$NOVA_STATE_PATH/instances}}

NOVA_CONF_DIR=/etc/nova
NOVA_CONF=$NOVA_CONF_DIR/nova.conf
NOVA_API_PASTE_INI=${NOVA_API_PASTE_INI:-$NOVA_CONF_DIR/api-paste.ini}

# Support entry points installation of console scripts
if [[ -d $NOVA_DIR/bin ]]; then
    NOVA_BIN_DIR=$NOVA_DIR/bin
else
    NOVA_BIN_DIR=/usr/local/bin
fi

# Set the paths of certain binaries
if [[ "$os_PACKAGE" = "deb" ]]; then
    NOVA_ROOTWRAP=/usr/local/bin/nova-rootwrap
else
    NOVA_ROOTWRAP=/usr/bin/nova-rootwrap
fi

# Allow rate limiting to be turned off for testing, like for Tempest
# NOTE: Set API_RATE_LIMIT="False" to turn OFF rate limiting
API_RATE_LIMIT=${API_RATE_LIMIT:-"True"}

# Nova supports pluggable schedulers.  The default ``FilterScheduler``
# should work in most cases.
SCHEDULER=${SCHEDULER:-nova.scheduler.filter_scheduler.FilterScheduler}

QEMU_CONF=/etc/libvirt/qemu.conf


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

function add_nova_opt {
    echo "$1" >>$NOVA_CONF
}

# Helper to clean iptables rules
function clean_iptables() {
    # Delete rules
    sudo iptables -S -v | sed "s/-c [0-9]* [0-9]* //g" | grep "nova" | grep "\-A" |  sed "s/-A/-D/g" | awk '{print "sudo iptables",$0}' | bash
    # Delete nat rules
    sudo iptables -S -v -t nat | sed "s/-c [0-9]* [0-9]* //g" | grep "nova" |  grep "\-A" | sed "s/-A/-D/g" | awk '{print "sudo iptables -t nat",$0}' | bash
    # Delete chains
    sudo iptables -S -v | sed "s/-c [0-9]* [0-9]* //g" | grep "nova" | grep "\-N" |  sed "s/-N/-X/g" | awk '{print "sudo iptables",$0}' | bash
    # Delete nat chains
    sudo iptables -S -v -t nat | sed "s/-c [0-9]* [0-9]* //g" | grep "nova" |  grep "\-N" | sed "s/-N/-X/g" | awk '{print "sudo iptables -t nat",$0}' | bash
}

# cleanup_nova() - Remove residual data files, anything left over from previous
# runs that a clean run would need to clean up
function cleanup_nova() {
    if is_service_enabled n-cpu; then
        # Clean iptables from previous runs
        clean_iptables

        # Destroy old instances
        instances=`sudo virsh list --all | grep $INSTANCE_NAME_PREFIX | sed "s/.*\($INSTANCE_NAME_PREFIX[0-9a-fA-F]*\).*/\1/g"`
        if [ ! "$instances" = "" ]; then
            echo $instances | xargs -n1 sudo virsh destroy || true
            echo $instances | xargs -n1 sudo virsh undefine || true
        fi

        # Logout and delete iscsi sessions
        sudo iscsiadm --mode node | grep $VOLUME_NAME_PREFIX | cut -d " " -f2 | xargs sudo iscsiadm --mode node --logout || true
        sudo iscsiadm --mode node | grep $VOLUME_NAME_PREFIX | cut -d " " -f2 | sudo iscsiadm --mode node --op delete || true

        # Clean out the instances directory.
        sudo rm -rf $NOVA_INSTANCES_PATH/*
    fi
}

# configure_novaclient() - Set config files, create data dirs, etc
function configure_novaclient() {
    setup_develop $NOVACLIENT_DIR
}

# configure_nova_rootwrap() - configure Nova's rootwrap
function configure_nova_rootwrap() {
    # Deploy new rootwrap filters files (owned by root).
    # Wipe any existing rootwrap.d files first
    if [[ -d $NOVA_CONF_DIR/rootwrap.d ]]; then
        sudo rm -rf $NOVA_CONF_DIR/rootwrap.d
    fi
    # Deploy filters to /etc/nova/rootwrap.d
    sudo mkdir -m 755 $NOVA_CONF_DIR/rootwrap.d
    sudo cp $NOVA_DIR/etc/nova/rootwrap.d/*.filters $NOVA_CONF_DIR/rootwrap.d
    sudo chown -R root:root $NOVA_CONF_DIR/rootwrap.d
    sudo chmod 644 $NOVA_CONF_DIR/rootwrap.d/*
    # Set up rootwrap.conf, pointing to /etc/nova/rootwrap.d
    sudo cp $NOVA_DIR/etc/nova/rootwrap.conf $NOVA_CONF_DIR/
    sudo sed -e "s:^filters_path=.*$:filters_path=$NOVA_CONF_DIR/rootwrap.d:" -i $NOVA_CONF_DIR/rootwrap.conf
    sudo chown root:root $NOVA_CONF_DIR/rootwrap.conf
    sudo chmod 0644 $NOVA_CONF_DIR/rootwrap.conf
    # Specify rootwrap.conf as first parameter to nova-rootwrap
    ROOTWRAP_SUDOER_CMD="$NOVA_ROOTWRAP $NOVA_CONF_DIR/rootwrap.conf *"

    # Set up the rootwrap sudoers for nova
    TEMPFILE=`mktemp`
    echo "$USER ALL=(root) NOPASSWD: $ROOTWRAP_SUDOER_CMD" >$TEMPFILE
    chmod 0440 $TEMPFILE
    sudo chown root:root $TEMPFILE
    sudo mv $TEMPFILE /etc/sudoers.d/nova-rootwrap
}

# configure_nova() - Set config files, create data dirs, etc
function configure_nova() {
    setup_develop $NOVA_DIR

    # Put config files in ``/etc/nova`` for everyone to find
    if [[ ! -d $NOVA_CONF_DIR ]]; then
        sudo mkdir -p $NOVA_CONF_DIR
    fi
    sudo chown `whoami` $NOVA_CONF_DIR

    cp -p $NOVA_DIR/etc/nova/policy.json $NOVA_CONF_DIR

    configure_nova_rootwrap

    if is_service_enabled n-api; then
        # Use the sample http middleware configuration supplied in the
        # Nova sources.  This paste config adds the configuration required
        # for Nova to validate Keystone tokens.

        # Remove legacy paste config if present
        rm -f $NOVA_DIR/bin/nova-api-paste.ini

        # Get the sample configuration file in place
        cp $NOVA_DIR/etc/nova/api-paste.ini $NOVA_CONF_DIR

        # Rewrite the authtoken configuration for our Keystone service.
        # This is a bit defensive to allow the sample file some variance.
        sed -e "
            /^admin_token/i admin_tenant_name = $SERVICE_TENANT_NAME
            /admin_tenant_name/s/^.*$/admin_tenant_name = $SERVICE_TENANT_NAME/;
            /admin_user/s/^.*$/admin_user = nova/;
            /admin_password/s/^.*$/admin_password = $SERVICE_PASSWORD/;
            s,%SERVICE_TENANT_NAME%,$SERVICE_TENANT_NAME,g;
            s,%SERVICE_TOKEN%,$SERVICE_TOKEN,g;
        " -i $NOVA_API_PASTE_INI
    fi

    if is_service_enabled n-cpu; then
        # Force IP forwarding on, just on case
        sudo sysctl -w net.ipv4.ip_forward=1

        # Attempt to load modules: network block device - used to manage qcow images
        sudo modprobe nbd || true

        # Check for kvm (hardware based virtualization).  If unable to initialize
        # kvm, we drop back to the slower emulation mode (qemu).  Note: many systems
        # come with hardware virtualization disabled in BIOS.
        if [[ "$LIBVIRT_TYPE" == "kvm" ]]; then
            sudo modprobe kvm || true
            if [ ! -e /dev/kvm ]; then
                echo "WARNING: Switching to QEMU"
                LIBVIRT_TYPE=qemu
                if which selinuxenabled 2>&1 > /dev/null && selinuxenabled; then
                    # https://bugzilla.redhat.com/show_bug.cgi?id=753589
                    sudo setsebool virt_use_execmem on
                fi
            fi
        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 [[ "$LIBVIRT_TYPE" == "lxc" ]]; then
            if [[ "$os_PACKAGE" = "deb" ]]; then
                if [[ ! "$DISTRO" > natty ]]; then
                    cgline="none /cgroup cgroup cpuacct,memory,devices,cpu,freezer,blkio 0 0"
                    sudo mkdir -p /cgroup
                    if ! grep -q cgroup /etc/fstab; then
                        echo "$cgline" | sudo tee -a /etc/fstab
                    fi
                    if ! mount -n | grep -q cgroup; then
                        sudo mount /cgroup
                    fi
                fi
            fi
        fi

        if is_service_enabled quantum && is_quantum_ovs_base_plugin "$Q_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 [[ "$os_PACKAGE" = "deb" ]]; then
            LIBVIRT_DAEMON=libvirt-bin
        else
            # http://wiki.libvirt.org/page/SSHPolicyKitSetup
            if ! grep ^libvirtd: /etc/group >/dev/null; then
                sudo groupadd libvirtd
            fi
            sudo bash -c 'cat <<EOF >/etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[libvirt Management Access]
Identity=unix-group:libvirtd
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
EOF'
            LIBVIRT_DAEMON=libvirtd
        fi

        # The user that nova runs as needs to be member of **libvirtd** group otherwise
        # nova-compute will be unable to use libvirt.
        sudo usermod -a -G libvirtd `whoami`

        # 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


        # Instance Storage
        # ----------------

        # Nova stores each instance in its own directory.
        mkdir -p $NOVA_INSTANCES_PATH

        # You can specify a different disk to be mounted and used for backing the
        # virtual machines.  If there is a partition labeled nova-instances we
        # mount it (ext filesystems can be labeled via e2label).
        if [ -L /dev/disk/by-label/nova-instances ]; then
            if ! mount -n | grep -q $NOVA_INSTANCES_PATH; then
                sudo mount -L nova-instances $NOVA_INSTANCES_PATH
                sudo chown -R `whoami` $NOVA_INSTANCES_PATH
            fi
        fi

        # Clean up old instances
        cleanup_nova
    fi
}

# init_nova() - Initialize databases, etc.
function init_nova() {
    # Remove legacy ``nova.conf``
    rm -f $NOVA_DIR/bin/nova.conf

    # (Re)create ``nova.conf``
    rm -f $NOVA_CONF
    add_nova_opt "[DEFAULT]"
    add_nova_opt "verbose=True"
    add_nova_opt "auth_strategy=keystone"
    add_nova_opt "allow_resize_to_same_host=True"
    add_nova_opt "api_paste_config=$NOVA_API_PASTE_INI"
    add_nova_opt "rootwrap_config=$NOVA_CONF_DIR/rootwrap.conf"
    add_nova_opt "compute_scheduler_driver=$SCHEDULER"
    add_nova_opt "dhcpbridge_flagfile=$NOVA_CONF"
    add_nova_opt "force_dhcp_release=True"
    add_nova_opt "fixed_range=$FIXED_RANGE"
    add_nova_opt "s3_host=$SERVICE_HOST"
    add_nova_opt "s3_port=$S3_SERVICE_PORT"
    add_nova_opt "osapi_compute_extension=nova.api.openstack.compute.contrib.standard_extensions"
    add_nova_opt "my_ip=$HOST_IP"
    add_nova_opt "sql_connection=$BASE_SQL_CONN/nova?charset=utf8"
    add_nova_opt "libvirt_type=$LIBVIRT_TYPE"
    add_nova_opt "libvirt_cpu_mode=none"
    add_nova_opt "instance_name_template=${INSTANCE_NAME_PREFIX}%08x"
    add_nova_opt "image_service=nova.image.glance.GlanceImageService"

    if is_service_enabled n-api; then
        add_nova_opt "enabled_apis=$NOVA_ENABLED_APIS"
    fi
    if is_service_enabled n-vol; then
        add_nova_opt "volume_api_class=nova.volume.api.API"
        add_nova_opt "volume_group=$VOLUME_GROUP"
        add_nova_opt "volume_name_template=${VOLUME_NAME_PREFIX}%s"
        # oneiric no longer supports ietadm
        add_nova_opt "iscsi_helper=tgtadm"
    fi
    if is_service_enabled cinder; then
        add_nova_opt "volume_api_class=nova.volume.cinder.API"
    fi
    if [ -n "$NOVA_STATE_PATH" ]; then
        add_nova_opt "state_path=$NOVA_STATE_PATH"
    fi
    if [ -n "$NOVA_INSTANCES_PATH" ]; then
        add_nova_opt "instances_path=$NOVA_INSTANCES_PATH"
    fi
    if [ "$MULTI_HOST" != "False" ]; then
        add_nova_opt "multi_host=True"
        add_nova_opt "send_arp_for_ha=True"
    fi
    if [ "$SYSLOG" != "False" ]; then
        add_nova_opt "use_syslog=True"
    fi
    if [ "$API_RATE_LIMIT" != "True" ]; then
        add_nova_opt "api_rate_limit=False"
    fi
    if [ "$LOG_COLOR" == "True" ] && [ "$SYSLOG" == "False" ]; then
        # Add color to logging output
        add_nova_opt "logging_context_format_string=%(asctime)s %(color)s%(levelname)s %(name)s [%(request_id)s %(user_name)s %(project_name)s%(color)s] %(instance)s%(color)s%(message)s"
        add_nova_opt "logging_default_format_string=%(asctime)s %(color)s%(levelname)s %(name)s [-%(color)s] %(instance)s%(color)s%(message)s"
        add_nova_opt "logging_debug_format_suffix=from (pid=%(process)d) %(funcName)s %(pathname)s:%(lineno)d"
        add_nova_opt "logging_exception_prefix=%(color)s%(asctime)s TRACE %(name)s %(instance)s"
    else
        # Show user_name and project_name instead of user_id and project_id
        add_nova_opt "logging_context_format_string=%(asctime)s %(levelname)s %(name)s [%(request_id)s %(user_name)s %(project_name)s] %(instance)s%(message)s"
    fi

    # Provide some transition from ``EXTRA_FLAGS`` to ``EXTRA_OPTS``
    if [[ -z "$EXTRA_OPTS" && -n "$EXTRA_FLAGS" ]]; then
        EXTRA_OPTS=$EXTRA_FLAGS
    fi

    # Define extra nova conf flags by defining the array ``EXTRA_OPTS``.
    # For Example: ``EXTRA_OPTS=(foo=true bar=2)``
    for I in "${EXTRA_OPTS[@]}"; do
        # Attempt to convert flags to options
        add_nova_opt ${I//--}
    done

    # Nova Database
    # -------------

    # All nova components talk to a central database.  We will need to do this step
    # only once for an entire cluster.

    if is_service_enabled mysql && is_service_enabled nova; then
        # (Re)create nova database
        mysql -u$MYSQL_USER -p$MYSQL_PASSWORD -e 'DROP DATABASE IF EXISTS nova;'

        # Explicitly use latin1: to avoid lp#829209, nova expects the database to
        # use latin1 by default, and then upgrades the database to utf8 (see the
        # 082_essex.py in nova)
        mysql -u$MYSQL_USER -p$MYSQL_PASSWORD -e 'CREATE DATABASE nova CHARACTER SET latin1;'

        # (Re)create nova database
        $NOVA_BIN_DIR/nova-manage db sync
    fi

}

# install_novaclient() - Collect source and prepare
function install_novaclient() {
    git_clone $NOVACLIENT_REPO $NOVACLIENT_DIR $NOVACLIENT_BRANCH
}

# install_nova() - Collect source and prepare
function install_nova() {
    if is_service_enabled n-cpu; then
        if [[ "$os_PACKAGE" = "deb" ]]; then
            LIBVIRT_PKG_NAME=libvirt-bin
        else
            LIBVIRT_PKG_NAME=libvirt
        fi
        install_package $LIBVIRT_PKG_NAME
        # Install and configure **LXC** if specified.  LXC is another approach to
        # splitting a system into many smaller parts.  LXC uses cgroups and chroot
        # to simulate multiple systems.
        if [[ "$LIBVIRT_TYPE" == "lxc" ]]; then
            if [[ "$os_PACKAGE" = "deb" ]]; then
                if [[ "$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
    fi

    git_clone $NOVA_REPO $NOVA_DIR $NOVA_BRANCH
}

# start_nova() - Start running processes, including screen
function start_nova() {
    # The group **libvirtd** is added to the current user in this script.
    # Use 'sg' to execute nova-compute as a member of the **libvirtd** group.
    # ``screen_it`` checks ``is_service_enabled``, it is not needed here
    screen_it n-cpu "cd $NOVA_DIR && sg libvirtd $NOVA_BIN_DIR/nova-compute"
    screen_it n-crt "cd $NOVA_DIR && $NOVA_BIN_DIR/nova-cert"
    screen_it n-net "cd $NOVA_DIR && $NOVA_BIN_DIR/nova-network"
    screen_it n-sch "cd $NOVA_DIR && $NOVA_BIN_DIR/nova-scheduler"
    screen_it n-novnc "cd $NOVNC_DIR && ./utils/nova-novncproxy --config-file $NOVA_CONF --web ."
    screen_it n-xvnc "cd $NOVA_DIR && ./bin/nova-xvpvncproxy --config-file $NOVA_CONF"
    screen_it n-cauth "cd $NOVA_DIR && ./bin/nova-consoleauth"
}

# stop_nova() - Stop running processes (non-screen)
function stop_nova() {
    # Kill the nova screen windows
    for serv in n-api n-cpu n-crt n-net n-sch n-novnc n-xvnc n-cauth; do
        screen -S $SCREEN_NAME -p $serv -X kill
    done
}

# Restore xtrace
$XTRACE