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package main
import (
"context"
"errors"
"fmt"
"os"
"strings"
"github.com/containers/buildah"
"github.com/containers/common/libnetwork/network"
"github.com/containers/common/pkg/config"
cp "github.com/containers/image/v5/copy"
"github.com/containers/image/v5/manifest"
"github.com/containers/image/v5/pkg/compression"
"github.com/containers/image/v5/signature"
imageStorage "github.com/containers/image/v5/storage"
"github.com/containers/image/v5/transports/alltransports"
"github.com/containers/image/v5/types"
"github.com/containers/storage"
"github.com/containers/storage/pkg/unshare"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
func main() {
var storeOptions storage.StoreOptions
var systemContext types.SystemContext
var logLevel string
var maxParallelDownloads uint
var compressionFormat string
var manifestFormat string
compressionLevel := -1
if buildah.InitReexec() {
return
}
unshare.MaybeReexecUsingUserNamespace(false)
storeOptions, err := storage.DefaultStoreOptions()
if err != nil {
storeOptions = storage.StoreOptions{}
}
rootCmd := &cobra.Command{
Use: "copy [flags] source destination",
Long: "copies an image",
RunE: func(cmd *cobra.Command, args []string) error {
if err := cobra.ExactArgs(2)(cmd, args); err != nil {
return err
}
if compressionLevel != -1 {
systemContext.CompressionLevel = &compressionLevel
}
if compressionFormat != "" {
alg, err := compression.AlgorithmByName(compressionFormat)
if err != nil {
return err
}
systemContext.CompressionFormat = &alg
}
switch strings.ToLower(manifestFormat) {
case "oci":
manifestFormat = v1.MediaTypeImageManifest
case "docker", "dockerv2s2":
manifestFormat = manifest.DockerV2Schema2MediaType
}
level, err := logrus.ParseLevel(logLevel)
if err != nil {
return err
}
logrus.SetLevel(level)
store, err := storage.GetStore(storeOptions)
if err != nil {
return err
}
imageStorage.Transport.SetStore(store)
conf, err := config.Default()
if err != nil {
return err
}
_, _, err = network.NetworkBackend(store, conf, false)
if err != nil {
return err
}
if len(args) < 1 {
return errors.New("no source name provided")
}
src, err := alltransports.ParseImageName(args[0])
if err != nil {
return fmt.Errorf("parsing source name: %w", err)
}
if len(args) < 1 {
return errors.New("no destination name provided")
}
dest, err := alltransports.ParseImageName(args[1])
if err != nil {
return fmt.Errorf("parsing destination name: %w", err)
}
policy, err := signature.DefaultPolicy(&systemContext)
if err != nil {
return fmt.Errorf("reading signature policy: %w", err)
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return fmt.Errorf("creating new signature policy context: %w", err)
}
defer func() {
if err := policyContext.Destroy(); err != nil {
logrus.Error(fmt.Errorf("destroying signature policy context: %w", err))
}
}()
options := cp.Options{
ReportWriter: os.Stdout,
SourceCtx: &systemContext,
DestinationCtx: &systemContext,
MaxParallelDownloads: maxParallelDownloads,
ForceManifestMIMEType: manifestFormat,
}
if _, err = cp.Image(context.TODO(), policyContext, dest, src, &options); err != nil {
return err
}
defer func() {
_, err := store.Shutdown(false)
if err != nil {
logrus.Error(err)
}
}()
return nil
},
}
rootCmd.PersistentFlags().StringVar(&storeOptions.GraphRoot, "root", "", "storage root")
rootCmd.PersistentFlags().StringVar(&storeOptions.RunRoot, "runroot", "", "runtime root")
rootCmd.PersistentFlags().StringVar(&storeOptions.GraphDriverName, "storage-driver", "", "storage driver")
rootCmd.PersistentFlags().StringSliceVar(&storeOptions.GraphDriverOptions, "storage-opt", nil, "storage option")
rootCmd.PersistentFlags().StringVar(&systemContext.SystemRegistriesConfPath, "registries-conf", "", "location of registries.conf")
rootCmd.PersistentFlags().StringVar(&systemContext.SystemRegistriesConfDirPath, "registries-conf-dir", "", "location of registries.d")
rootCmd.PersistentFlags().StringVar(&systemContext.SignaturePolicyPath, "signature-policy", "", "`pathname` of signature policy file")
rootCmd.PersistentFlags().StringVar(&systemContext.UserShortNameAliasConfPath, "short-name-alias-conf", "", "`pathname` of short name alias cache file (not usually used)")
rootCmd.PersistentFlags().StringVar(&logLevel, "log-level", "warn", "logging level")
rootCmd.PersistentFlags().UintVar(&maxParallelDownloads, "max-parallel-downloads", 0, "maximum `number` of blobs to copy at once")
rootCmd.PersistentFlags().StringVar(&manifestFormat, "format", "", "image manifest type")
rootCmd.PersistentFlags().BoolVar(&systemContext.DirForceCompress, "dest-compress", false, "force compression of layers for dir: destinations")
rootCmd.PersistentFlags().BoolVar(&systemContext.DirForceDecompress, "dest-decompress", false, "force decompression of layers for dir: destinations")
rootCmd.PersistentFlags().StringVar(&compressionFormat, "dest-compress-format", "", "compression type")
rootCmd.PersistentFlags().IntVar(&compressionLevel, "dest-compress-level", 0, "compression level")
if err := rootCmd.Execute(); err != nil {
os.Exit(1)
}
}
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