Use correct []byte reader interface.

Author: mitchell-as

internal/unarchiver/unarchiver.go

@@ -27,16 +27,13 @@ func NewTarGz() Unarchiver {
 
 func NewZip() Unarchiver {
 	return Unarchiver{
-		archives.CompressedArchive{
-			Extraction: archives.Zip{},
-		},
+		archives.Zip{},
 	}
 }
 
 // PrepareUnpacking prepares the destination directory and the archive for unpacking
 // Returns the opened file
 func (ua *Unarchiver) PrepareUnpacking(source, destination string) (archiveFile *os.File, err error) {
-
 	if !fileutils.DirExists(destination) {
 		err := mkdir(destination)
 		if err != nil {
@@ -50,7 +47,6 @@ func (ua *Unarchiver) PrepareUnpacking(source, destination string) (archiveFile
 	}
 
 	return archiveFile, nil
-
 }
 
 // Unarchive unarchives an archive file and unpacks it in `destination`

internal/updater/fetcher.go

@@ -80,7 +80,7 @@ func (f *Fetcher) Fetch(update *UpdateInstaller, targetDir string) error {
 	if runtime.GOOS == "windows" {
 		ua = unarchiver.NewZip()
 	}
-	if err := ua.Unarchive(bytes.NewBuffer(b), targetDir); err != nil {
+	if err := ua.Unarchive(bytes.NewReader(b), targetDir); err != nil {
 		msg := "Unarchiving failed"
 		f.analyticsEvent(update.AvailableUpdate.Version, msg)
 		return errs.Wrap(err, msg)