Add imageTagTransformer

pkg/transformers/imagetag.go

@@ -0,0 +1,116 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"strings"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/resmap"
+	"github.com/kubernetes-sigs/kustomize/pkg/types"
+)
+
+// imageTagTransformer replace image tags
+type imageTagTransformer struct {
+	imageTags []types.ImageTag
+}
+
+var _ Transformer = &imageTagTransformer{}
+
+// NewImageTagTransformer constructs a imageTagTransformer.
+func NewImageTagTransformer(slice []types.ImageTag) (Transformer, error) {
+	return &imageTagTransformer{slice}, nil
+}
+
+// Transform finds the matching images and replace the tag
+func (pt *imageTagTransformer) Transform(resources resmap.ResMap) error {
+	if len(pt.imageTags) == 0 {
+		return nil
+	}
+	for _, res := range resources {
+		err := pt.findAndReplaceTag(res.UnstructuredContent())
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+/*
+ findAndReplaceTag replaces the image tags inside one object
+ It searches the object for container session
+ then loops though all images inside containers session, finds matched ones and update the tag name
+*/
+func (pt *imageTagTransformer) findAndReplaceTag(obj map[string]interface{}) error {
+	_, found := obj["containers"]
+	if found {
+		return pt.updateContainers(obj)
+	}
+	return pt.findContainers(obj)
+}
+
+func (pt *imageTagTransformer) updateContainers(obj map[string]interface{}) error {
+	containers := obj["containers"].([]interface{})
+	for i := range containers {
+		container := containers[i].(map[string]interface{})
+		image, found := container["image"]
+		if !found {
+			continue
+		}
+		for _, imagetag := range pt.imageTags {
+			if isImageMatched(image.(string), imagetag.Name) {
+				container["image"] = strings.Join([]string{imagetag.Name, imagetag.NewTag}, ":")
+				break
+			}
+		}
+		containers[i] = container
+	}
+	obj["containers"] = containers
+	return nil
+}
+
+func (pt *imageTagTransformer) findContainers(obj map[string]interface{}) error {
+	for key := range obj {
+		switch typedV := obj[key].(type) {
+		case map[string]interface{}:
+			err := pt.findAndReplaceTag(typedV)
+			if err != nil {
+				return err
+			}
+		case []interface{}:
+			for i := range typedV {
+				item := typedV[i]
+				typedItem, ok := item.(map[string]interface{})
+				if ok {
+					err := pt.findAndReplaceTag(typedItem)
+					if err != nil {
+						return err
+					}
+				}
+				typedV[i] = typedItem
+			}
+		}
+	}
+	return nil
+}
+
+func isImageMatched(s, t string) bool {
+	imagetag := strings.Split(s, ":")
+	if len(imagetag) >= 1 {
+		return imagetag[0] == t
+	}
+	return false
+}

pkg/transformers/imagetag_test.go

@@ -0,0 +1,170 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/resmap"
+	"github.com/kubernetes-sigs/kustomize/pkg/resource"
+	"github.com/kubernetes-sigs/kustomize/pkg/types"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestImageTagTransformer(t *testing.T) {
+	m := resmap.ResMap{
+		resource.NewResId(deploy, "deploy1"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"group":      "apps",
+				"apiVersion": "v1",
+				"kind":       "Deployment",
+				"metadata": map[string]interface{}{
+					"name": "deploy1",
+				},
+				"spec": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "nginx",
+									"image": "nginx:1.7.9",
+								},
+								map[string]interface{}{
+									"name":  "nginx2",
+									"image": "my-nginx:1.8.0",
+								},
+							},
+						},
+					},
+				},
+			}),
+		resource.NewResId(schema.GroupVersionKind{Kind: "randomeKind"}, "random"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"spec": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "nginx1",
+									"image": "nginx",
+								},
+								map[string]interface{}{
+									"name":  "nginx2",
+									"image": "my-nginx:random",
+								},
+							},
+						},
+					},
+				},
+				"spec2": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "ngin3",
+									"image": "nginx:v1",
+								},
+								map[string]interface{}{
+									"name":  "nginx4",
+									"image": "my-nginx:latest",
+								},
+							},
+						},
+					},
+				},
+			}),
+	}
+	expected := resmap.ResMap{
+		resource.NewResId(deploy, "deploy1"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"group":      "apps",
+				"apiVersion": "v1",
+				"kind":       "Deployment",
+				"metadata": map[string]interface{}{
+					"name": "deploy1",
+				},
+				"spec": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "nginx",
+									"image": "nginx:v2",
+								},
+								map[string]interface{}{
+									"name":  "nginx2",
+									"image": "my-nginx:previous",
+								},
+							},
+						},
+					},
+				},
+			}),
+		resource.NewResId(schema.GroupVersionKind{Kind: "randomeKind"}, "random"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"spec": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "nginx1",
+									"image": "nginx:v2",
+								},
+								map[string]interface{}{
+									"name":  "nginx2",
+									"image": "my-nginx:previous",
+								},
+							},
+						},
+					},
+				},
+				"spec2": map[string]interface{}{
+					"template": map[string]interface{}{
+						"spec": map[string]interface{}{
+							"containers": []interface{}{
+								map[string]interface{}{
+									"name":  "ngin3",
+									"image": "nginx:v2",
+								},
+								map[string]interface{}{
+									"name":  "nginx4",
+									"image": "my-nginx:previous",
+								},
+							},
+						},
+					},
+				},
+			}),
+	}
+
+	it, err := NewImageTagTransformer([]types.ImageTag{
+		{Name: "nginx", NewTag: "v2"},
+		{Name: "my-nginx", NewTag: "previous"},
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	err = it.Transform(m)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(m, expected) {
+		err = expected.ErrorIfNotEqual(m)
+		t.Fatalf("actual doesn't match expected: %v", err)
+	}
+}