#!/bin/bash
#
# Copyright (c) 2016-2016 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
#
# This script provides support for CPE upgrades. It will be called during swacts
# by the /usr/local/sbin/sm-notification python script, if we are in a small
# footprint system (CPE)
#
# During a swact to, the script will delete the $VOLATILE_DISABLE_COMPUTE_SERVICES
# flag and re-apply the compute manifests.
# During a swact away from (downgrades), the script re-create the
# $VOLATILE_DISABLE_COMPUTE_SERVICES flag and re-apply the compute manifests.
#
# This script should only re-apply the compute manifests if;
#     - It is running on a CPE (small footprint) system
#     - It is controller-1
#     - Controller-0 has not yet been upgraded
#
# This script logs to /var/log/platform.log
#

. /usr/bin/tsconfig
. /etc/platform/platform.conf

VOLATILE_CONFIG_PASS="/var/run/.config_pass"
VOLATILE_CONFIG_FAIL="/var/run/.config_fail"

IN_PROGRESS="/var/run/.compute_services_in_progress"

TEMP_MATE_ETC_DIR="$VOLATILE_PATH/etc_platform_compute"
TEMP_PUPPET_DIR="$VOLATILE_PATH/puppet_compute"

# Copy of /opt/platform populate by compute_config
VOLATILE_PLATFORM_PATH=$VOLATILE_PATH/cpe_upgrade_opt_platform

# Process id and full filename of this executable
NAME="[$$] $0($1)"

end_exec()
{
    rm $IN_PROGRESS
    exit 0
}

init()
{
    local action_to_perform=$1

    # This will log to /var/log/platform.log
    logger -t $NAME -p local1.info  "Begin ..."

    # Check if this program is currently executing, if so sleep for 5 seconds and check again.
    # After 10 minutes of waiting assume something is wrong and exit.
    count=0
    while [ -f $IN_PROGRESS ] ; do
       if [ $count -gt 120 ] ; then
          logger -t $NAME -p local1.error "Execution completion of previous call is taking more than 10 minutes. Exiting."
          end_exec
       fi
       logger -t $NAME -p local1.info "Sleep for 5 seconds"
       let count++
       sleep 5
    done

    touch $IN_PROGRESS

    HOST=$(hostname)
    if [ -z "$HOST" -o "$HOST" = "localhost" ] ; then
        logger -t $NAME -p local1.error "Host undefiled"
        end_exec
    fi

    # this script should only be performed on controller-1
    if [ "$HOST" != "controller-1" ] ; then
        logger -t $NAME -p local1.info "Exiting because this is not controller-1"
        end_exec
    fi

    # This script should only be called if we are in a CPE system
    sub_function=`echo "$subfunction" | cut -f 2 -d','`
    if [ $sub_function != "compute" ] ; then
        logger -t $NAME -p local1.error "Exiting because this is not CPE host"
        end_exec
    fi

    # Exit if called while the config compute success flag file is not present
    if [ ! -f $VOLATILE_CONFIG_PASS ] ; then
        logger -t $NAME -p local1.info "Exiting due to non-presence of $VOLATILE_CONFIG_PASS file"
        end_exec
    fi

    # Exit if called while the config compute failure flag file is present
    if [ -f $VOLATILE_CONFIG_FAIL ] ; then
        logger -t $NAME -p local1.info "Exiting due to presence of $VOLATILE_CONFIG_FAIL file"
        end_exec
    fi

    # Ensure we only run if the controller config is complete
    if [ ! -f /etc/platform/.initial_controller_config_complete ] ; then
        logger -t $NAME -p local1.warn "exiting because CPE controller that has not completed initial config"
        end_exec
    fi

    IPADDR=$(cat /etc/hosts | awk -v host=$HOST '$2 == host {print $1}')
    if [ -z "$IPADDR" ] ; then
        logger -t $NAME -p local1.error "Unable to get IP from host: $HOST"
        end_exec
    fi

    # The platform filesystem was mounted in compute_config and copied in a temp
    # location
    if [ ! -f $VOLATILE_PLATFORM_PATH/config/${SW_VERSION}/hosts ] ; then
        logger -t $NAME -p local1.error "Error accessing $VOLATILE_PLATFORM_PATH"
        end_exec
    fi

    # Check the release version of controller-0
    mkdir $TEMP_MATE_ETC_DIR

    nfs-mount controller-0:/etc/platform $TEMP_MATE_ETC_DIR
    if [ $? -eq 0 ] ; then
        # Should only be executed when the releases do not match
        MATE_SW_VERSION=$(source $TEMP_MATE_ETC_DIR/platform.conf && echo $sw_version)

        logger -t $NAME -p local1.info  "SW_VERSION: $SW_VERSION  MATE_SW_VERSION: $MATE_SW_VERSION"

        # Check whether software versions match on the two controllers
        # Since controller-1 is always upgraded first (and downgraded
        # last), we know that controller-1 is running a higher release
        # than controller-0.
        if [ $SW_VERSION == $MATE_SW_VERSION ] ; then
           logger -t $NAME -p local1.info "Releases matches... do not continue"
           umount $TEMP_MATE_ETC_DIR
           rmdir $TEMP_MATE_ETC_DIR
           end_exec
        fi
    else
        logger -t $NAME -p local1.error "Unable to mount /etc/platform"
        rmdir $TEMP_MATE_ETC_DIR
        end_exec
    fi

    umount $TEMP_MATE_ETC_DIR
    rmdir $TEMP_MATE_ETC_DIR

    # Copy the puppet data into $TEMP_PUPPET_DIR

    VOLATILE_PUPPET_PATH=${VOLATILE_PLATFORM_PATH}/puppet/${SW_VERSION}
    logger -t $NAME -p local1.info "VOLATILE_PUPPET_PATH = $VOLATILE_PUPPET_PATH"

    rm -rf $TEMP_PUPPET_DIR
    cp -R $VOLATILE_PUPPET_PATH $TEMP_PUPPET_DIR
    if [ $? -ne 0 ] ; then
        logger -t $NAME -p local1.error "Failed to copy packstack directory $VOLATILE_PUPPET_PATH to $TEMP_PUPPET_DIR "
        end_exec
    fi

    # Update the VOLATILE_DISABLE_COMPUTE_SERVICES flag and stop nova-compute if in "stop"
    if [ $action_to_perform == "stop" ] ; then
        logger -t $NAME -p local1.info  "Disabling compute services"

        # Set the compute services disable flag used by the manifest
        touch $VOLATILE_DISABLE_COMPUTE_SERVICES

        # Stop nova-compute
        logger -t $NAME -p local1.info  "Stopping nova-compute"
        /etc/init.d/e_nova-init stop
    else
        logger -t $NAME -p local1.info  "Enabling compute services"

        # Clear the compute services disable flag used by the manifest
        rm $VOLATILE_DISABLE_COMPUTE_SERVICES
    fi

    # Apply the puppet manifest
    HOST_HIERA=${TEMP_PUPPET_DIR}/hieradata/${IPADDR}.yaml
    if [ -f ${HOST_HIERA} ]; then
        echo "$0: Running puppet manifest apply"
        puppet-manifest-apply.sh ${TEMP_PUPPET_DIR}/hieradata ${IPADDR} compute
        RC=$?
        if [ $RC -ne 0 ];
        then
            logger -t $NAME -p local1.info "Failed to run the puppet manifest (RC:$RC)"
            end_exec
        fi
    else
        logger -t $NAME -p local1.info "Host configuration not yet available for this node ($(hostname)=${IPADDR}); aborting configuration."
        end_exec
    fi

    # Start nova-compute is we are starting compute services
    if [ $action_to_perform == "start" ] ; then
        logger -t $NAME -p local1.info  "Starting nova-compute"
        /etc/init.d/e_nova-init start
    fi

    # Cleanup
    rm -rf $TEMP_PUPPET_DIR

    logger -t $NAME -p local1.info "... Done"
    end_exec
}

case "$1" in
    start)
        init $1
        ;;
    stop)
        init $1
        ;;
    *)
        logger -t $NAME -p local1.info "Usage: $0 {start|stop}"
        exit 1
        ;;
esac

end_exec