# Fix a failed Crashplan upgrade on a Synology NAS.
# This function should be run directly on the NAS, as root.
#
# Based on Chris Nelson's blog post from here:
# http://chrisnelson.ca/2015/07/02/fixing-crashplan-4-3-0-on-synology/

function do_crashplan_upgrade() {
    cp_target_dir="/var/packages/CrashPlan/target"
    cp_upgrade_jar=`ls -t -1 "$cp_target_dir/upgrade/"*jar | head -n1`
    cp_version=`basename "$cp_upgrade_jar" .jar`
    if [[ -z $cp_version ]]; then
        echo "Can't find crashplan upgrade jar file"
        return
    fi

    unzip -o "$cp_upgrade_jar" "*.jar" -d "$cp_target_dir/lib/"
    unzip -o "$cp_upgrade_jar" "lang/*" -d "$cp_target_dir/"
    # This was required for old upgrades.  Don't seem to need it anymore:
    # unzip -o "$cp_upgrade_jar" run.conf -d "$cp_target_dir/bin/"

    # This decommissions the most recent upgrade file so CP will regenerate it.
    # upgrade_file=`ls -t -d "cp_target_dir/upgrade/$cp_version".*/upgrade.sh | head -n1`
    # mv "$upgrade_file" "$upgrade_file".old
    # ... or just decommission all of them
    for upgrade_file in /var/packages/CrashPlan/target/upgrade/$cp_version.*/upgrade.sh; do
        mv "$upgrade_file" "$upgrade_file".old
    done

    echo "Upgrade prep work completed for version $cp_version."
    echo "Now, you should log into your Synology and restart the Crashplan package."
    # now it's time to (re)start crashplan and make sure it upgraded

    echo "Once you have confirmed the upgrade is successful, add the following"
    echo "headless key to your .ui_info file:"
    echo -n "    "
    cat /var/lib/crashplan/.ui_info  ; echo
    echo
    echo "For more details, see the original instructions here:"
    echo "http://chrisnelson.ca/2015/07/02/fixing-crashplan-4-3-0-on-synology/"
}