Move the k8s code generator.

cmd/k8scopy/internal/modulespec.go

@@ -0,0 +1,37 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package internal
+
+import (
+	"io/ioutil"
+
+	"sigs.k8s.io/yaml"
+)
+
+type ModuleSpec struct {
+	Module   string        `json:"module,omitempty" yaml:"module,omitempty"`
+	Version  string        `json:"version,omitempty" yaml:"version,omitempty"`
+	Packages []PackageSpec `json:"packages,omitempty" yaml:"packages,omitempty"`
+}
+
+func (s ModuleSpec) Name() string {
+	return s.Module + "@" + s.Version
+}
+
+type PackageSpec struct {
+	Name  string   `json:"name,omitempty" yaml:"name,omitempty"`
+	Files []string `json:"files,omitempty" yaml:"files,omitempty"`
+}
+
+func ReadSpec(fileName string) *ModuleSpec {
+	bytes, err := ioutil.ReadFile(fileName)
+	if err != nil {
+		panic(err)
+	}
+	var spec ModuleSpec
+	if err = yaml.Unmarshal(bytes, &spec); err != nil {
+		panic(err)
+	}
+	return &spec
+}