dstFile=$repoName-r$rev
test -n "$rev" || dstFile=$repoName

dstFile=source

      finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" git-export)

      finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" source)

    finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" hg-archive)

    finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" source)