@@ -0,0 +1,68 @@
+package fetcher
+
+import (
+	"archive/tar"
+	"compress/bzip2"
+	"io"
+	"os"
+
+	"alin.ovh/x/log"
+	"github.com/Southclaws/fault"
+	"github.com/Southclaws/fault/fmsg"
+)
+
+func bunzip(r io.Reader) io.Reader {
+	return bzip2.NewReader(r)
+}
+
+func extract(body io.Reader, root *os.Root, log *log.Logger) error {
+	tr := tar.NewReader(body)
+	for {
+		head, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return fault.Wrap(err, fmsg.With("could not read tar header"))
+		}
+
+		log.Debug("extracting file", "name", head.Name)
+
+		switch head.Typeflag {
+		case tar.TypeReg:
+			err := writeFile(tr, head, root)
+			if err != nil {
+				return fault.Wrap(err, fmsg.Withf("could not write file %s", head.Name))
+			}
+		case tar.TypeDir:
+			err := root.MkdirAll(head.Name, head.FileInfo().Mode().Perm())
+			if err != nil {
+				return fault.Wrap(err, fmsg.Withf("could not create directory %s", head.Name))
+			}
+		default:
+			return fault.Newf("unsupported file type %d", head.Typeflag)
+		}
+	}
+
+	return nil
+}
+
+func writeFile(tr *tar.Reader, head *tar.Header, root *os.Root) error {
+	file, err := root.OpenFile(head.Name, os.O_CREATE|os.O_WRONLY, head.FileInfo().Mode().Perm())
+	if err != nil {
+		return fault.Wrap(err, fmsg.Withf("could not open file %s", head.Name))
+	}
+	defer file.Close()
+
+	_, err = io.Copy(file, tr)
+	if err != nil {
+		return fault.Wrap(err, fmsg.Withf("could not write file %s", head.Name))
+	}
+
+	err = file.Sync()
+	if err != nil {
+		return fault.Wrap(err, fmsg.Withf("could not sync file %s", head.Name))
+	}
+
+	return nil
+}