flink-end-to-end-tests/test-scripts/common_artifact_download_cacher.sh

#!/usr/bin/env bash
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# This bash script aims to predownload dependency tarballs for the E2E tests.

if [ -z "$E2E_TARBALL_CACHE" ] ; then
    echo "You have to export the E2E Tarball Cache as E2E_TARBALL_CACHE"
    exit 1
fi

mkdir -p $E2E_TARBALL_CACHE

# Given a variable name and a URL, checks whether the file exists in the E2E_TARBALL_CACHE,
# otherwise retrieves from source, and echos the path to the cached file.
# For example:
# result=$(get_artifact https://archive.apache.org/artifact.tar.gz)
# echo $result

function get_artifact {
    local ARTIFACT_URL=$1
    BASENAME="`basename $ARTIFACT_URL`"
    if [ ! -f "$E2E_TARBALL_CACHE/$BASENAME" ]; then
        curl $ARTIFACT_URL --retry 10 --retry-max-time 120 --output $E2E_TARBALL_CACHE/$BASENAME
        local res=$?
        if [ ! 0 -eq $res ]; then
            exit 1
        fi
    fi
    echo "$E2E_TARBALL_CACHE/$BASENAME"
}