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package buildah
import (
"context"
"errors"
"fmt"
"github.com/containers/buildah/define"
"github.com/containers/buildah/docker"
"github.com/containers/buildah/util"
"github.com/containers/image/v5/image"
"github.com/containers/image/v5/manifest"
is "github.com/containers/image/v5/storage"
"github.com/containers/image/v5/transports"
"github.com/containers/image/v5/types"
"github.com/containers/storage"
digest "github.com/opencontainers/go-digest"
)
func importBuilderDataFromImage(ctx context.Context, store storage.Store, systemContext *types.SystemContext, imageID, containerName, containerID string) (*Builder, error) {
if imageID == "" {
return nil, errors.New("internal error: imageID is empty in importBuilderDataFromImage")
}
storeopts, err := storage.DefaultStoreOptions()
if err != nil {
return nil, err
}
uidmap, gidmap := convertStorageIDMaps(storeopts.UIDMap, storeopts.GIDMap)
ref, err := is.Transport.ParseStoreReference(store, imageID)
if err != nil {
return nil, fmt.Errorf("no such image %q: %w", imageID, err)
}
src, err := ref.NewImageSource(ctx, systemContext)
if err != nil {
return nil, fmt.Errorf("instantiating image source: %w", err)
}
defer src.Close()
imageDigest := ""
unparsedTop := image.UnparsedInstance(src, nil)
manifestBytes, manifestType, err := unparsedTop.Manifest(ctx)
if err != nil {
return nil, fmt.Errorf("loading image manifest for %q: %w", transports.ImageName(ref), err)
}
if manifestDigest, err := manifest.Digest(manifestBytes); err == nil {
imageDigest = manifestDigest.String()
}
var instanceDigest *digest.Digest
unparsedInstance := unparsedTop // for instanceDigest
if manifest.MIMETypeIsMultiImage(manifestType) {
list, err := manifest.ListFromBlob(manifestBytes, manifestType)
if err != nil {
return nil, fmt.Errorf("parsing image manifest for %q as list: %w", transports.ImageName(ref), err)
}
instance, err := list.ChooseInstance(systemContext)
if err != nil {
return nil, fmt.Errorf("finding an appropriate image in manifest list %q: %w", transports.ImageName(ref), err)
}
instanceDigest = &instance
unparsedInstance = image.UnparsedInstance(src, instanceDigest)
}
image, err := image.FromUnparsedImage(ctx, systemContext, unparsedInstance)
if err != nil {
return nil, fmt.Errorf("instantiating image for %q instance %q: %w", transports.ImageName(ref), instanceDigest, err)
}
imageName := ""
if img, err3 := store.Image(imageID); err3 == nil {
if len(img.Names) > 0 {
imageName = img.Names[0]
}
if img.TopLayer != "" {
layer, err4 := store.Layer(img.TopLayer)
if err4 != nil {
return nil, fmt.Errorf("reading information about image's top layer: %w", err4)
}
uidmap, gidmap = convertStorageIDMaps(layer.UIDMap, layer.GIDMap)
}
}
defaultNamespaceOptions, err := DefaultNamespaceOptions()
if err != nil {
return nil, err
}
netInt, err := getNetworkInterface(store, "", "")
if err != nil {
return nil, err
}
builder := &Builder{
store: store,
Type: containerType,
FromImage: imageName,
FromImageID: imageID,
FromImageDigest: imageDigest,
Container: containerName,
ContainerID: containerID,
ImageCreatedBy: "",
NamespaceOptions: defaultNamespaceOptions,
IDMappingOptions: define.IDMappingOptions{
HostUIDMapping: len(uidmap) == 0,
HostGIDMapping: len(uidmap) == 0,
UIDMap: uidmap,
GIDMap: gidmap,
},
NetworkInterface: netInt,
CommonBuildOpts: &CommonBuildOptions{},
}
if err := builder.initConfig(ctx, systemContext, image, nil); err != nil {
return nil, fmt.Errorf("preparing image configuration: %w", err)
}
return builder, nil
}
func importBuilder(ctx context.Context, store storage.Store, options ImportOptions) (*Builder, error) {
if options.Container == "" {
return nil, errors.New("container name must be specified")
}
c, err := store.Container(options.Container)
if err != nil {
return nil, err
}
systemContext := getSystemContext(store, &types.SystemContext{}, options.SignaturePolicyPath)
builder, err := importBuilderDataFromImage(ctx, store, systemContext, c.ImageID, options.Container, c.ID)
if err != nil {
return nil, err
}
if builder.FromImageID != "" {
if d, err2 := digest.Parse(builder.FromImageID); err2 == nil {
builder.Docker.Parent = docker.ID(d)
} else {
builder.Docker.Parent = docker.ID(digest.NewDigestFromHex(digest.Canonical.String(), builder.FromImageID))
}
}
if builder.FromImage != "" {
builder.Docker.ContainerConfig.Image = builder.FromImage
}
builder.IDMappingOptions.UIDMap, builder.IDMappingOptions.GIDMap = convertStorageIDMaps(c.UIDMap, c.GIDMap)
err = builder.Save()
if err != nil {
return nil, fmt.Errorf("saving builder state: %w", err)
}
return builder, nil
}
func importBuilderFromImage(ctx context.Context, store storage.Store, options ImportFromImageOptions) (*Builder, error) {
if options.Image == "" {
return nil, errors.New("image name must be specified")
}
systemContext := getSystemContext(store, options.SystemContext, options.SignaturePolicyPath)
_, img, err := util.FindImage(store, "", systemContext, options.Image)
if err != nil {
return nil, fmt.Errorf("importing settings: %w", err)
}
builder, err := importBuilderDataFromImage(ctx, store, systemContext, img.ID, "", "")
if err != nil {
return nil, fmt.Errorf("importing build settings from image %q: %w", options.Image, err)
}
builder.setupLogger()
return builder, nil
}
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