adding extractspec

shell/extractspec.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+#
+# read all .src.rpm and extract the .spec
+# bsdtar is part of libarchive (http://libarchive.org/)
+#
+# SPDX-License-Identifier: MIT
+
+for RPM in ./*.src.rpm; do
+  VER=${RPM%.src.rpm}
+  bsdtar -xOf "${RPM}" \*.spec > "./${VER}.spec"
+done
+
+exit 0