#!/bin/bash
set -e

# Latest one can be found at https://dl.rockylinux.org/pub/rocky/9.4/images/x86_64/
# It is marked as https://dl.rockylinux.org/pub/rocky/9.4/images/x86_64/Rocky-9-GenericCloud-Base.latest.x86_64.qcow2
# The specific deployment it corresponds to can be found by searching for the file size (number on the right) in the page

if [ ! -f $BASE_DISK_FILEPATH ]; then
    vmDiskFileURL="https://dl.rockylinux.org/pub/rocky/$ROCKY_VERSION/images/x86_64/$VM_DISK_FILE_TO_DOWNLOAD"
    checksumFileName="$VM_DISK_FILE_TO_DOWNLOAD.CHECKSUM"
    vmDiskFileChecksumURL="https://dl.rockylinux.org/pub/rocky/$ROCKY_VERSION/images/x86_64/$checksumFileName"

    echo "--- Downloading $vmDiskFileURL ---"
    curl $vmDiskFileURL -o $BASE_DISK_FILEPATH
    echo "--- Downloading $vmDiskFileChecksumURL ---"
    curl $vmDiskFileChecksumURL -o $OUTPUT_DIR$checksumFileName

    echo "--- Checking checksum ---"
    expectedChecksum=$(cat $OUTPUT_DIR/$checksumFileName | awk 'NR==2 {print $4}')
    if [ $(sha256sum $BASE_DISK_FILEPATH | awk '{print $1}') == "$expectedChecksum" ]; then
        echo "--- CHECKSUM CONFIRMED ---"
    else
        echo "--- CHECKSUM DOES NOT MATCH! ---"
        rm $BASE_DISK_FILEPATH
        exit 1
    fi
    echo "--- Finished checking checksum ---"

else
    echo "--- Using cached base file $BASE_DISK_FILEPATH ---"
fi