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|
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"os"
"strings"
"github.com/containers/buildah"
"github.com/containers/buildah/define"
"github.com/containers/buildah/docker"
"github.com/containers/buildah/util"
"github.com/containers/image/v5/manifest"
is "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"
)
func main() {
if buildah.InitReexec() {
return
}
unshare.MaybeReexecUsingUserNamespace(false)
storeOptions, err := storage.DefaultStoreOptions()
if err != nil {
storeOptions = storage.StoreOptions{}
}
expectedManifestType := ""
expectedConfigType := ""
debug := flag.Bool("debug", false, "turn on debug logging")
root := flag.String("root", storeOptions.GraphRoot, "storage root directory")
runroot := flag.String("runroot", storeOptions.RunRoot, "storage runtime directory")
driver := flag.String("storage-driver", storeOptions.GraphDriverName, "storage driver")
opts := flag.String("storage-opts", "", "storage option list (comma separated)")
policy := flag.String("signature-policy", "", "signature policy file")
mtype := flag.String("expected-manifest-type", define.OCIv1ImageManifest, "expected manifest type")
showm := flag.Bool("show-manifest", false, "output the manifest JSON")
rebuildm := flag.Bool("rebuild-manifest", false, "rebuild the manifest JSON")
showc := flag.Bool("show-config", false, "output the configuration JSON")
rebuildc := flag.Bool("rebuild-config", false, "rebuild the configuration JSON")
flag.Parse()
logrus.SetLevel(logrus.ErrorLevel)
if debug != nil && *debug {
logrus.SetLevel(logrus.DebugLevel)
}
switch *mtype {
case define.OCIv1ImageManifest:
expectedManifestType = *mtype
expectedConfigType = v1.MediaTypeImageConfig
case define.Dockerv2ImageManifest:
expectedManifestType = *mtype
expectedConfigType = manifest.DockerV2Schema2ConfigMediaType
case "*":
expectedManifestType = ""
expectedConfigType = ""
default:
logrus.Errorf("unknown -expected-manifest-type value, expected either %q or %q or %q",
define.OCIv1ImageManifest, define.Dockerv2ImageManifest, "*")
return
}
if root != nil {
storeOptions.GraphRoot = *root
}
if runroot != nil {
storeOptions.RunRoot = *runroot
}
if driver != nil {
storeOptions.GraphDriverName = *driver
storeOptions.GraphDriverOptions = nil
}
if opts != nil && *opts != "" {
storeOptions.GraphDriverOptions = strings.Split(*opts, ",")
}
systemContext := &types.SystemContext{
SignaturePolicyPath: *policy,
}
args := flag.Args()
if len(args) == 0 {
flag.Usage()
return
}
store, err := storage.GetStore(storeOptions)
if err != nil {
logrus.Errorf("error opening storage: %v", err)
os.Exit(1)
}
is.Transport.SetStore(store)
errors := false
defer func() {
store.Shutdown(false) // nolint:errcheck
if errors {
os.Exit(1)
}
}()
for _, image := range args {
var ref types.ImageReference
oImage := v1.Image{}
dImage := docker.V2Image{}
oManifest := v1.Manifest{}
dManifest := docker.V2S2Manifest{}
manifestType := ""
configType := ""
ref, _, err := util.FindImage(store, "", systemContext, image)
if err != nil {
ref2, err2 := alltransports.ParseImageName(image)
if err2 != nil {
logrus.Errorf("error parsing reference %q to an image: %v", image, err)
errors = true
continue
}
ref = ref2
}
ctx := context.Background()
img, err := ref.NewImage(ctx, systemContext)
if err != nil {
logrus.Errorf("error opening image %q: %v", image, err)
errors = true
continue
}
defer img.Close()
config, err := img.ConfigBlob(ctx)
if err != nil {
logrus.Errorf("error reading configuration from %q: %v", image, err)
errors = true
continue
}
manifest, manifestType, err := img.Manifest(ctx)
if err != nil {
logrus.Errorf("error reading manifest from %q: %v", image, err)
errors = true
continue
}
if expectedManifestType != "" && manifestType != expectedManifestType {
logrus.Errorf("expected manifest type %q in %q, got %q", expectedManifestType, image, manifestType)
errors = true
continue
}
switch expectedManifestType {
case define.OCIv1ImageManifest:
err = json.Unmarshal(manifest, &oManifest)
if err != nil {
logrus.Errorf("error parsing manifest from %q: %v", image, err)
errors = true
continue
}
err = json.Unmarshal(config, &oImage)
if err != nil {
logrus.Errorf("error parsing config from %q: %v", image, err)
errors = true
continue
}
manifestType = oManifest.MediaType
configType = oManifest.Config.MediaType
case define.Dockerv2ImageManifest:
err = json.Unmarshal(manifest, &dManifest)
if err != nil {
logrus.Errorf("error parsing manifest from %q: %v", image, err)
errors = true
continue
}
err = json.Unmarshal(config, &dImage)
if err != nil {
logrus.Errorf("error parsing config from %q: %v", image, err)
errors = true
continue
}
manifestType = dManifest.MediaType
configType = dManifest.Config.MediaType
}
switch manifestType {
case define.OCIv1ImageManifest:
if rebuildm != nil && *rebuildm {
err = json.Unmarshal(manifest, &oManifest)
if err != nil {
logrus.Errorf("error parsing manifest from %q: %v", image, err)
errors = true
continue
}
manifest, err = json.Marshal(oManifest)
if err != nil {
logrus.Errorf("error rebuilding manifest from %q: %v", image, err)
errors = true
continue
}
}
if rebuildc != nil && *rebuildc {
err = json.Unmarshal(config, &oImage)
if err != nil {
logrus.Errorf("error parsing config from %q: %v", image, err)
errors = true
continue
}
config, err = json.Marshal(oImage)
if err != nil {
logrus.Errorf("error rebuilding config from %q: %v", image, err)
errors = true
continue
}
}
case define.Dockerv2ImageManifest:
if rebuildm != nil && *rebuildm {
err = json.Unmarshal(manifest, &dManifest)
if err != nil {
logrus.Errorf("error parsing manifest from %q: %v", image, err)
errors = true
continue
}
manifest, err = json.Marshal(dManifest)
if err != nil {
logrus.Errorf("error rebuilding manifest from %q: %v", image, err)
errors = true
continue
}
}
if rebuildc != nil && *rebuildc {
err = json.Unmarshal(config, &dImage)
if err != nil {
logrus.Errorf("error parsing config from %q: %v", image, err)
errors = true
continue
}
config, err = json.Marshal(dImage)
if err != nil {
logrus.Errorf("error rebuilding config from %q: %v", image, err)
errors = true
continue
}
}
}
if expectedConfigType != "" && configType != expectedConfigType {
logrus.Errorf("expected config type %q in %q, got %q", expectedConfigType, image, configType)
errors = true
continue
}
if showm != nil && *showm {
fmt.Println(string(manifest))
}
if showc != nil && *showc {
fmt.Println(string(config))
}
}
}
|
