migrate

migrate/checksum.go

@@ -0,0 +1,34 @@
+// Copyright (C) 2017 ScyllaDB
+// Use of this source code is governed by a ALv2-style
+// license that can be found in the LICENSE file.
+
+package migrate
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"io"
+	"os"
+)
+
+var encode = hex.EncodeToString
+
+func checksum(b []byte) string {
+	v := md5.Sum(b)
+	return encode(v[:])
+}
+
+func fileChecksum(path string) (string, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return "", nil
+	}
+	defer f.Close()
+
+	h := md5.New()
+	if _, err := io.Copy(h, f); err != nil {
+		return "", err
+	}
+	v := h.Sum(nil)
+	return encode(v[:]), nil
+}