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// Copyright 2018 Google LLC 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 cmd
import (
"context"
"encoding/json"
"fmt"
"path"
"github.com/google/go-containerregistry/cmd/crane/cmd"
"github.com/google/go-containerregistry/pkg/gcrane"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/google"
"github.com/spf13/cobra"
)
func userAgent() string {
if cmd.Version != "" {
return path.Join("gcrane", cmd.Version)
}
return "gcrane"
}
// NewCmdList creates a new cobra.Command for the ls subcommand.
func NewCmdList() *cobra.Command {
recursive := false
json := false
cmd := &cobra.Command{
Use: "ls REPO",
Short: "List the contents of a repo",
Args: cobra.ExactArgs(1),
RunE: func(cc *cobra.Command, args []string) error {
return ls(cc.Context(), args[0], recursive, json)
},
}
cmd.Flags().BoolVarP(&recursive, "recursive", "r", false, "Whether to recurse through repos")
cmd.Flags().BoolVar(&json, "json", false, "Format the response from the registry as JSON, one line per repo")
return cmd
}
func ls(ctx context.Context, root string, recursive, j bool) error {
repo, err := name.NewRepository(root)
if err != nil {
return err
}
opts := []google.Option{
google.WithAuthFromKeychain(gcrane.Keychain),
google.WithUserAgent(userAgent()),
google.WithContext(ctx),
}
if recursive {
return google.Walk(repo, printImages(j), opts...)
}
tags, err := google.List(repo, opts...)
if err != nil {
return err
}
if !j {
if len(tags.Manifests) == 0 && len(tags.Children) == 0 {
// If we didn't see any GCR extensions, just list the tags like normal.
for _, tag := range tags.Tags {
fmt.Printf("%s:%s\n", repo, tag)
}
return nil
}
// Since we're not recursing, print the subdirectories too.
for _, child := range tags.Children {
fmt.Printf("%s/%s\n", repo, child)
}
}
return printImages(j)(repo, tags, err)
}
func printImages(j bool) google.WalkFunc {
return func(repo name.Repository, tags *google.Tags, err error) error {
if err != nil {
return err
}
if j {
b, err := json.Marshal(tags)
if err != nil {
return err
}
fmt.Printf("%s\n", b)
return nil
}
for digest, manifest := range tags.Manifests {
fmt.Printf("%s@%s\n", repo, digest)
for _, tag := range manifest.Tags {
fmt.Printf("%s:%s\n", repo, tag)
}
}
return nil
}
}
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