purge_cache.sh

#!/bin/bash -e

# Intended as a proof of concept to see if we can purge the NPM cache in npm2rpm

cd "$1"

package="$(basename $(realpath .))"

spectool --get-files "${package}.spec"

cachedir=$(mktemp -d)
trap "rm -rf '${cachedir}'" EXIT

echo "Cache size before (compressed)"
ls -sh "${package}"-[0-9]*-registry.npmjs.org.tgz

tar xaf "${package}"-[0-9]*-registry.npmjs.org.tgz -C "$cachedir"

echo "Cache size before (uncompressed)"
du -sh "$cachedir"

for filename in *.tgz ; do
        checksum=$(sha512sum "$filename" | cut -d' ' -f1)
        echo "Handling ${filename} (${checksum})"

        cache_filename="${cachedir}/_cacache/content-v2/sha512/${checksum:0:2}/${checksum:2:2}/${checksum:4}"
        rm -fv $cache_filename
done

echo "Cache size after (uncompressed)"
du -sh "$cachedir"

tar caf "${package}-new-registry.npmjs.org.tgz" -C "$cachedir" .
echo "Cache size after (compressed)"
ls -sh "${package}-new-registry.npmjs.org.tgz"