Imports github.com/mitchellh/go-fs github.com/mitchellh/go-fs/fat github.com/mitchellh/multistep github.com/mitchellh/packer/packer Standard library imports bytes crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 encoding/hex errors fmt hash io io/ioutil log net/http net/url os path/filepath runtime strings time