added hash check for node edit

Signed-off-by: Christian Goll <cgoll@suse.de>

internal/pkg/api/node/hash.go

@@ -0,0 +1,20 @@
+package apinode
+
+import (
+	"encoding/hex"
+
+	"github.com/hpcng/warewulf/internal/pkg/api/routes/wwapiv1"
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+)
+
+func Hash() *wwapiv1.NodeDBHash {
+	config, err := node.New()
+	if err != nil {
+		wwlog.Warn("couldb't read config")
+	}
+	hash := config.Hash()
+	return &wwapiv1.NodeDBHash{
+		Hash: hex.EncodeToString(hash[:]),
+	}
+}