58 lines
2 KiB
Go
58 lines
2 KiB
Go
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package archive
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import (
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"io"
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"os"
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"github.com/containers/image/docker/tarfile"
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"github.com/containers/image/types"
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"github.com/pkg/errors"
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)
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type archiveImageDestination struct {
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*tarfile.Destination // Implements most of types.ImageDestination
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ref archiveReference
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writer io.Closer
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}
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func newImageDestination(ctx *types.SystemContext, ref archiveReference) (types.ImageDestination, error) {
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if ref.destinationRef == nil {
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return nil, errors.Errorf("docker-archive: destination reference not supplied (must be of form <path>:<reference:tag>)")
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}
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fh, err := os.OpenFile(ref.path, os.O_WRONLY|os.O_EXCL|os.O_CREATE, 0644)
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if err != nil {
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// FIXME: It should be possible to modify archives, but the only really
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// sane way of doing it is to create a copy of the image, modify
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// it and then do a rename(2).
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if os.IsExist(err) {
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err = errors.New("docker-archive doesn't support modifying existing images")
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}
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return nil, err
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}
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return &archiveImageDestination{
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Destination: tarfile.NewDestination(fh, ref.destinationRef),
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ref: ref,
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writer: fh,
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}, nil
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}
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// Reference returns the reference used to set up this destination. Note that this should directly correspond to user's intent,
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// e.g. it should use the public hostname instead of the result of resolving CNAMEs or following redirects.
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func (d *archiveImageDestination) Reference() types.ImageReference {
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return d.ref
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}
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// Close removes resources associated with an initialized ImageDestination, if any.
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func (d *archiveImageDestination) Close() error {
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return d.writer.Close()
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}
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// Commit marks the process of storing the image as successful and asks for the image to be persisted.
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// WARNING: This does not have any transactional semantics:
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// - Uploaded data MAY be visible to others before Commit() is called
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// - Uploaded data MAY be removed or MAY remain around if Close() is called without Commit() (i.e. rollback is allowed but not guaranteed)
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func (d *archiveImageDestination) Commit() error {
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return d.Destination.Commit()
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}
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