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package buildah
import (
"context"
"fmt"
"io"
"io/ioutil"
"time"
cp "github.com/containers/image/copy"
"github.com/containers/image/signature"
is "github.com/containers/image/storage"
"github.com/containers/image/transports"
"github.com/containers/image/types"
"github.com/containers/storage"
"github.com/containers/storage/pkg/archive"
"github.com/pkg/errors"
"github.com/projectatomic/buildah/util"
"github.com/sirupsen/logrus"
)
// CommitOptions can be used to alter how an image is committed.
type CommitOptions struct {
// PreferredManifestType is the preferred type of image manifest. The
// image configuration format will be of a compatible type.
PreferredManifestType string
// Compression specifies the type of compression which is applied to
// layer blobs. The default is to not use compression, but
// archive.Gzip is recommended.
Compression archive.Compression
// SignaturePolicyPath specifies an override location for the signature
// policy which should be used for verifying the new image as it is
// being written. Except in specific circumstances, no value should be
// specified, indicating that the shared, system-wide default policy
// should be used.
SignaturePolicyPath string
// AdditionalTags is a list of additional names to add to the image, if
// the transport to which we're writing the image gives us a way to add
// them.
AdditionalTags []string
// ReportWriter is an io.Writer which will be used to log the writing
// of the new image.
ReportWriter io.Writer
// HistoryTimestamp is the timestamp used when creating new items in the
// image's history. If unset, the current time will be used.
HistoryTimestamp *time.Time
// github.com/containers/image/types SystemContext to hold credentials
// and other authentication/authorization information.
SystemContext *types.SystemContext
// IIDFile tells the builder to write the image ID to the specified file
IIDFile string
// Squash tells the builder to produce an image with a single layer
// instead of with possibly more than one layer.
Squash bool
// OnBuild is a list of commands to be run by images based on this image
OnBuild []string
// Parent is the base image that this image was created by.
Parent string
}
// PushOptions can be used to alter how an image is copied somewhere.
type PushOptions struct {
// Compression specifies the type of compression which is applied to
// layer blobs. The default is to not use compression, but
// archive.Gzip is recommended.
Compression archive.Compression
// SignaturePolicyPath specifies an override location for the signature
// policy which should be used for verifying the new image as it is
// being written. Except in specific circumstances, no value should be
// specified, indicating that the shared, system-wide default policy
// should be used.
SignaturePolicyPath string
// ReportWriter is an io.Writer which will be used to log the writing
// of the new image.
ReportWriter io.Writer
// Store is the local storage store which holds the source image.
Store storage.Store
// github.com/containers/image/types SystemContext to hold credentials
// and other authentication/authorization information.
SystemContext *types.SystemContext
// ManifestType is the format to use when saving the imge using the 'dir' transport
// possible options are oci, v2s1, and v2s2
ManifestType string
}
// Commit writes the contents of the container, along with its updated
// configuration, to a new image in the specified location, and if we know how,
// add any additional tags that were specified. Returns the ID of the new image
// if commit was successful and the image destination was local
func (b *Builder) Commit(ctx context.Context, dest types.ImageReference, options CommitOptions) (string, error) {
var imgID string
systemContext := getSystemContext(options.SystemContext, options.SignaturePolicyPath)
policy, err := signature.DefaultPolicy(systemContext)
if err != nil {
return imgID, errors.Wrapf(err, "error obtaining default signature policy")
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return imgID, errors.Wrapf(err, "error creating new signature policy context")
}
defer func() {
if err2 := policyContext.Destroy(); err2 != nil {
logrus.Debugf("error destroying signature policy context: %v", err2)
}
}()
// Check if the base image is already in the destination and it's some kind of local
// storage. If so, we can skip recompressing any layers that come from the base image.
exportBaseLayers := true
if transport, destIsStorage := dest.Transport().(is.StoreTransport); destIsStorage && b.FromImageID != "" {
if baseref, err := transport.ParseReference(b.FromImageID); baseref != nil && err == nil {
if img, err := transport.GetImage(baseref); img != nil && err == nil {
exportBaseLayers = false
}
}
}
src, err := b.makeImageRef(options.PreferredManifestType, options.Parent, exportBaseLayers, options.Squash, options.Compression, options.HistoryTimestamp)
if err != nil {
return imgID, errors.Wrapf(err, "error computing layer digests and building metadata")
}
// "Copy" our image to where it needs to be.
err = cp.Image(ctx, policyContext, dest, src, getCopyOptions(options.ReportWriter, nil, systemContext, ""))
if err != nil {
return imgID, errors.Wrapf(err, "error copying layers and metadata")
}
if len(options.AdditionalTags) > 0 {
switch dest.Transport().Name() {
case is.Transport.Name():
img, err := is.Transport.GetStoreImage(b.store, dest)
if err != nil {
return imgID, errors.Wrapf(err, "error locating just-written image %q", transports.ImageName(dest))
}
err = util.AddImageNames(b.store, "", systemContext, img, options.AdditionalTags)
if err != nil {
return imgID, errors.Wrapf(err, "error setting image names to %v", append(img.Names, options.AdditionalTags...))
}
logrus.Debugf("assigned names %v to image %q", img.Names, img.ID)
default:
logrus.Warnf("don't know how to add tags to images stored in %q transport", dest.Transport().Name())
}
}
img, err := is.Transport.GetStoreImage(b.store, dest)
if err != nil && err != storage.ErrImageUnknown {
return imgID, err
}
if err == nil {
imgID = img.ID
if options.IIDFile != "" {
if err := ioutil.WriteFile(options.IIDFile, []byte(img.ID), 0644); err != nil {
return imgID, errors.Wrapf(err, "failed to write Image ID File %q", options.IIDFile)
}
}
}
return imgID, nil
}
// Push copies the contents of the image to a new location.
func Push(ctx context.Context, image string, dest types.ImageReference, options PushOptions) error {
systemContext := getSystemContext(options.SystemContext, options.SignaturePolicyPath)
policy, err := signature.DefaultPolicy(systemContext)
if err != nil {
return errors.Wrapf(err, "error obtaining default signature policy")
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return errors.Wrapf(err, "error creating new signature policy context")
}
// Look up the image.
src, _, err := util.FindImage(options.Store, "", systemContext, image)
if err != nil {
return err
}
// Copy everything.
err = cp.Image(ctx, policyContext, dest, src, getCopyOptions(options.ReportWriter, nil, systemContext, options.ManifestType))
if err != nil {
return errors.Wrapf(err, "error copying layers and metadata")
}
if options.ReportWriter != nil {
fmt.Fprintf(options.ReportWriter, "\n")
}
return nil
}
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