Imports github.com/ulikunitz/xz github.com/biogo/hts/bgzf github.com/hashicorp/packer/common github.com/hashicorp/packer/helper/config github.com/hashicorp/packer/packer github.com/hashicorp/packer/template/interpolate github.com/klauspost/pgzip github.com/pierrec/lz4 Standard library imports compress/gzip archive/tar archive/zip fmt io os path/filepath regexp runtime time