Image relocation

Fixes cnabio#668

cmd/duffle/relocate.go

@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2019-Present Pivotal Software, Inc. All Rights Reserved.
+ *
+ * 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 main
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/deislabs/duffle/pkg/bundle"
+	"github.com/deislabs/duffle/pkg/duffle/home"
+
+	"github.com/spf13/cobra"
+	"k8s.io/apimachinery/pkg/util/validation"
+)
+
+const relocateDesc = `
+Relocates the images referenced by a bundle and creates a new bundle with an updated image map.
+
+The --repository-prefix flag determines the repositories for the relocated images.
+Each image is tagged with a name starting with the given prefix and pushed to the repository.
+
+For example, if the repository-prefix is example.com/user, the image istio/proxyv2 is relocated
+to a name starting with example.com/user/ and pushed to a repository hosted by example.com.
+`
+
+type relocateCmd struct {
+	inputBundle  string
+	home         home.Home
+	outputBundle string
+	out          io.Writer
+
+	repoPrefix        string
+	inputBundleIsFile bool
+}
+
+func newRelocateCmd(w io.Writer) *cobra.Command {
+	relocate := &relocateCmd{out: w}
+
+	cmd := &cobra.Command{
+		Use:   "relocate [INPUT-BUNDLE] [OUTPUT-BUNDLE]",
+		Short: "relocate images in a CNAB bundle",
+		Long:  relocateDesc,
+		Example: `duffle relocate helloworld hellorelocated --repository-prefix example.com/user
+duffle relocate path/to/bundle.json relocatedbundle --repository-prefix example.com/user --input-bundle-is-file`,
+		Args: cobra.ExactArgs(2),
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			// validate --repository-prefix if it is set, otherwise allow flag omission to be diagnosed as such
+			if cmd.Flags().Changed("repository-prefix") {
+				if err := flagValidRepository("repository-prefix")(cmd); err != nil {
+					return err
+				}
+			}
+
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			relocate.inputBundle = args[0]
+			relocate.outputBundle = args[1]
+			relocate.home = home.Home(homePath())
+
+			return relocate.run()
+		},
+	}
+
+	f := cmd.Flags()
+	f.BoolVarP(&relocate.inputBundleIsFile, "input-bundle-is-file", "", false, "Indicates that the input bundle source is a file path")
+	f.StringVarP(&relocate.repoPrefix, "repository-prefix", "r", "", "Prefix for relocated image names")
+	cmd.MarkFlagRequired("repository-prefix")
+
+	return cmd
+}
+
+func (r *relocateCmd) run() error {
+	bun, err := r.setup()
+	if err != nil {
+		return err
+	}
+	if err := r.Relocate(bun); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (r *relocateCmd) Relocate(bun *bundle.Bundle) error {
+	return nil
+}
+
+func (r *relocateCmd) setup() (*bundle.Bundle, error) {
+	bundleFile, err := resolveBundleFilePath(r.inputBundle, r.home.String(), r.inputBundleIsFile)
+	if err != nil {
+		return nil, err
+	}
+
+	bun, err := loadBundle(bundleFile)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = bun.Validate(); err != nil {
+		return nil, err
+	}
+
+	return bun, nil
+}
+
+type flagsValidator func(cmd *cobra.Command) error
+
+func flagValidRepository(flagName string) flagsValidator {
+	return func(cmd *cobra.Command) error {
+		repositoryValue := cmd.Flag(flagName).Value.String()
+
+		if strings.HasSuffix(repositoryValue, "/") || strings.Contains(repositoryValue, "//") {
+			return fmt.Errorf("invalid repository: %s", repositoryValue)
+		}
+
+		for i, part := range strings.Split(repositoryValue, "/") {
+			if i != 0 {
+				if strings.ContainsAny(part, ":@\" ") {
+					return fmt.Errorf("invalid repository: %s", repositoryValue)
+				}
+				continue
+			}
+
+			authorityParts := strings.Split(part, ":")
+			if len(authorityParts) > 2 {
+				return fmt.Errorf("invalid repository hostname: %s", part)
+			}
+			if errs := validation.IsDNS1123Subdomain(authorityParts[0]); len(errs) > 0 {
+				return fmt.Errorf("invalid repository hostname: %s", strings.Join(errs, "; "))
+			}
+			if len(authorityParts) == 2 {
+				portNumber, err := strconv.Atoi(authorityParts[1])
+				if err != nil {
+					return fmt.Errorf("invalid repository port number: %s", authorityParts[1])
+				}
+
+				if errs := validation.IsValidPortNum(portNumber); len(errs) > 0 {
+					return fmt.Errorf("invalid repository port number: %s", strings.Join(errs, "; "))
+				}
+			}
+		}
+
+		return nil
+	}
+}

cmd/duffle/root.go

@@ -46,6 +46,7 @@ func newRootCmd(outputRedirect io.Writer) *cobra.Command {
 	cmd.AddCommand(newInitCmd(outLog))
 	cmd.AddCommand(newShowCmd(outLog))
 	cmd.AddCommand(newListCmd(outLog))
+	cmd.AddCommand(newRelocateCmd(outLog))
 	cmd.AddCommand(newVersionCmd(outLog))
 	cmd.AddCommand(newInstallCmd(outLog))
 	cmd.AddCommand(newStatusCmd(outLog))