kexpand util

pkg/kexpand/util.go

@@ -0,0 +1,121 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package manifest
+
+import (
+	"errors"
+	"io/ioutil"
+	"path"
+
+	"gopkg.in/yaml.v2"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	manifest "k8s.io/kubectl/pkg/apis/manifest/v1alpha1"
+	"k8s.io/kubernetes/pkg/kubectl/resource"
+)
+
+const kubeManifestFileName = "Kube-manifest.yaml"
+
+// loadBaseAndOverlayPkg returns:
+// - List of FilenameOptions, each FilenameOptions contains all the files and whether recursive for each base defined in overlay kube-manifest.yaml.
+// - Fileoptions for overlay.
+// - Package object for overlay.
+// - A potential error.
+func loadBaseAndOverlayPkg(f string) ([]resource.FilenameOptions, resource.FilenameOptions, *manifest.Manifest, error) {
+	overlay, err := loadManifestPkg(path.Join(f, kubeManifestFileName))
+	if err != nil {
+		return nil, resource.FilenameOptions{}, nil, err
+	}
+	overlayFileOptions := resource.FilenameOptions{
+	// TODO: support `recursive` when we figure out what its behavior should be.
+	// Recursive: overlay.Recursive
+	}
+	for _, o := range overlay.Patches {
+		overlayFileOptions.Filenames = append(overlayFileOptions.Filenames, path.Join(f, o))
+	}
+
+	if len(overlay.Resources) == 0 {
+		return nil, resource.FilenameOptions{}, nil, errors.New("expect at least one base, but got 0")
+	}
+
+	var baseFileOptionsList []resource.FilenameOptions
+	for _, base := range overlay.Resources {
+		var baseFilenames []string
+		baseManifest, err := loadManifestPkg(path.Join(f, base, kubeManifestFileName))
+		if err != nil {
+			return nil, resource.FilenameOptions{}, nil, err
+		}
+		for _, filename := range baseManifest.Resources {
+			baseFilenames = append(baseFilenames, path.Join(f, base, filename))
+		}
+		baseFileOptions := resource.FilenameOptions{
+			Filenames: baseFilenames,
+			// TODO: support `recursive` when we figure out what its behavior should be.
+			// Recursive: baseManifest.Recursive,
+		}
+		baseFileOptionsList = append(baseFileOptionsList, baseFileOptions)
+	}
+
+	return baseFileOptionsList, overlayFileOptions, overlay, nil
+}
+
+// loadManifestPkg loads a manifest file and parse it in to the Package object.
+func loadManifestPkg(filename string) (*manifest.Manifest, error) {
+	bytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	var pkg manifest.Manifest
+	// TODO: support json
+	err = yaml.Unmarshal(bytes, &pkg)
+	return &pkg, err
+}
+
+// updateMetadata will inject the labels and annotations and add name prefix.
+func updateMetadata(obj runtime.Object, overlayPkg *manifest.Manifest) error {
+	if overlayPkg == nil {
+		return nil
+	}
+
+	accessor, err := meta.Accessor(obj)
+	if err != nil {
+		return err
+	}
+
+	accessor.SetName(overlayPkg.NamePrefix + accessor.GetName())
+
+	labels := accessor.GetLabels()
+	if labels == nil {
+		labels = map[string]string{}
+	}
+	for k, v := range overlayPkg.ObjectLabels {
+		labels[k] = v
+	}
+	accessor.SetLabels(labels)
+
+	annotations := accessor.GetAnnotations()
+	if annotations == nil {
+		annotations = map[string]string{}
+	}
+	for k, v := range overlayPkg.ObjectAnnotations {
+		annotations[k] = v
+	}
+	accessor.SetAnnotations(annotations)
+
+	return nil
+}