download_blender.sh

#!/bin/bash
set -u

# Release can be for example: "2.90", "Beta", "2.91", "Alpha", ...
release=${1:-"Beta"}
destination=${2:-.}
BUILDER_DOMAIN=${BUILDER_DOMAIN:-"builder.blender.org"}
XMLLINT=${XMLLINT:-xmllint}

# check if xmllint binary is availble
if ! command -v "${XMLLINT}" > /dev/null; then
    echo "Error: Cannot find ${XMLLINT} binary. Please install the package."
    exit 1
fi
xmllint=$(command -v "${XMLLINT}")

# check if curl binary is availble
if ! command -v curl > /dev/null; then
    echo "Error: Cannot find curl binary. Please install the package."
    exit 1
fi
curl=$(command -v curl)

echo "Fetching all Blender downloads with version \"${release}\" from \"${BUILDER_DOMAIN}\" to folder \"${destination}\""

# Change into destination directory
if ! pushd "${destination}" 1> /dev/null; then
    echo "Cannot access folder \"${destination}\""
fi

# Fetch download links
download_hrefs="$(${curl} -s --fail https://${BUILDER_DOMAIN}/download/ | ${xmllint} --html --xpath "//a[contains(.,'${release}')]/@href" - 2> /dev/null)"
if [ $? -ne 0 ]; then
    echo "Unable to find version \"${release}\" on \"${BUILDER_DOMAIN}\""
    exit 1
fi

# Download the actual packages
for href in ${download_hrefs};
 do
    link=${href//href=}
    link=${link//\"}
    echo "Downloading $(basename "${link}")"
    if ! curl -s --fail "https://${BUILDER_DOMAIN}${link}" -O; then
        echo "ERROR: Unable to download: https://${BUILDER_DOMAIN}${link}"
        exit 1
    fi
done
echo "Finished downloading files to \"${destination}\""

# Change back into previous folder
popd  1> /dev/null || exit 1