update

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/open-policy-agent/opa/internal/file/archive/tarball.go

@@ -0,0 +1,42 @@
+package archive
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"strings"
+)
+
+// MustWriteTarGz write the list of file names and content
+// into a tarball.
+func MustWriteTarGz(files [][2]string) *bytes.Buffer {
+	var buf bytes.Buffer
+	gw := gzip.NewWriter(&buf)
+	defer gw.Close()
+	tw := tar.NewWriter(gw)
+	defer tw.Close()
+	for _, file := range files {
+		if err := WriteFile(tw, file[0], []byte(file[1])); err != nil {
+			panic(err)
+		}
+	}
+	return &buf
+}
+
+// WriteFile adds a file header with content to the given tar writer
+func WriteFile(tw *tar.Writer, path string, bs []byte) error {
+
+	hdr := &tar.Header{
+		Name:     "/" + strings.TrimLeft(path, "/"),
+		Mode:     0600,
+		Typeflag: tar.TypeReg,
+		Size:     int64(len(bs)),
+	}
+
+	if err := tw.WriteHeader(hdr); err != nil {
+		return err
+	}
+
+	_, err := tw.Write(bs)
+	return err
+}