# lib/n-vol
# Install and start Nova volume service

# Dependencies:
# - functions
# - DATA_DIR must be defined
# - KEYSTONE_AUTH_* must be defined
# - NOVA_DIR, NOVA_BIN_DIR, NOVA_STATE_PATH must be defined
# SERVICE_{TENANT_NAME|PASSWORD} must be defined
# _configure_tgt_for_config_d() from lib/cinder

# stack.sh
# ---------
# install_nvol
# configure_nvol
# init_nvol
# start_nvol
# stop_nvol
# cleanup_nvol

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


# Defaults
# --------

# Name of the LVM volume group to use/create for iscsi volumes
VOLUME_GROUP=${VOLUME_GROUP:-stack-volumes}
VOLUME_NAME_PREFIX=${VOLUME_NAME_PREFIX:-volume-}


# cleanup_nvol() - Remove residual data files, anything left over from previous
# runs that a clean run would need to clean up
function cleanup_nvol() {
    # kill instances (nova)
    # delete image files (glance)
    # This function intentionally left blank
    :
}

# configure_nvol() - Set config files, create data dirs, etc
function configure_nvol() {
    # sudo python setup.py deploy
    # iniset $XXX_CONF ...
    # This function intentionally left blank
    :
}

# init_nvol() - Initialize databases, etc.
function init_nvol() {
    # Configure a default volume group called '`stack-volumes`' for the volume
    # service if it does not yet exist.  If you don't wish to use a file backed
    # volume group, create your own volume group called ``stack-volumes`` before
    # invoking ``stack.sh``.
    #
    # By default, the backing file is 5G in size, and is stored in ``/opt/stack/data``.

    if ! sudo vgs $VOLUME_GROUP; then
        VOLUME_BACKING_FILE=${VOLUME_BACKING_FILE:-$DATA_DIR/${VOLUME_GROUP}-backing-file}
        # Only create if the file doesn't already exists
        [[ -f $VOLUME_BACKING_FILE ]] || truncate -s $VOLUME_BACKING_FILE_SIZE $VOLUME_BACKING_FILE
        DEV=`sudo losetup -f --show $VOLUME_BACKING_FILE`
        # Only create if the loopback device doesn't contain $VOLUME_GROUP
        if ! sudo vgs $VOLUME_GROUP; then sudo vgcreate $VOLUME_GROUP $DEV; fi
    fi

    mkdir -p $NOVA_STATE_PATH/volumes

    if sudo vgs $VOLUME_GROUP; then
        if [[ "$os_PACKAGE" = "rpm" ]]; then
            # RPM doesn't start the service
            start_service tgtd
        fi

        # Remove nova iscsi targets
        sudo tgtadm --op show --mode target | grep $VOLUME_NAME_PREFIX | grep Target | cut -f3 -d ' ' | sudo xargs -n1 tgt-admin --delete || true
        # Clean out existing volumes
        for lv in `sudo lvs --noheadings -o lv_name $VOLUME_GROUP`; do
            # ``VOLUME_NAME_PREFIX`` prefixes the LVs we want
            if [[ "${lv#$VOLUME_NAME_PREFIX}" != "$lv" ]]; then
                sudo lvremove -f $VOLUME_GROUP/$lv
            fi
        done
    fi
}

# install_nvol() - Collect source and prepare
function install_nvol() {
    # git clone xxx
    # Install is handled when installing Nova
    :
}

# start_nvol() - Start running processes, including screen
function start_nvol() {
    # Setup the tgt configuration file
    if [[ ! -f /etc/tgt/conf.d/nova.conf ]]; then
        _configure_tgt_for_config_d
       sudo mkdir -p /etc/tgt/conf.d
       echo "include $NOVA_STATE_PATH/volumes/*" | sudo tee /etc/tgt/conf.d/nova.conf
    fi

    if [[ "$os_PACKAGE" = "deb" ]]; then
        # tgt in oneiric doesn't restart properly if tgtd isn't running
        # do it in two steps
        sudo stop tgt || true
        sudo start tgt
    else
        restart_service tgtd
    fi

    screen_it n-vol "cd $NOVA_DIR && $NOVA_BIN_DIR/nova-volume"
}

# stop_nvol() - Stop running processes (non-screen)
function stop_nvol() {
    # FIXME(dtroyer): stop only the n-vol screen window?

    stop_service tgt
}

# Restore xtrace
$XTRACE