59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package containerd
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import (
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"context"
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"io"
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"github.com/containerd/containerd/images"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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type exportOpts struct {
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}
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// ExportOpt allows the caller to specify export-specific options
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type ExportOpt func(c *exportOpts) error
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func resolveExportOpt(opts ...ExportOpt) (exportOpts, error) {
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var eopts exportOpts
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for _, o := range opts {
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if err := o(&eopts); err != nil {
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return eopts, err
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}
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}
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return eopts, nil
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}
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// Export exports an image to a Tar stream.
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// OCI format is used by default.
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// It is up to caller to put "org.opencontainers.image.ref.name" annotation to desc.
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// TODO(AkihiroSuda): support exporting multiple descriptors at once to a single archive stream.
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func (c *Client) Export(ctx context.Context, exporter images.Exporter, desc ocispec.Descriptor, opts ...ExportOpt) (io.ReadCloser, error) {
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_, err := resolveExportOpt(opts...) // unused now
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if err != nil {
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return nil, err
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}
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pr, pw := io.Pipe()
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go func() {
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pw.CloseWithError(errors.Wrap(exporter.Export(ctx, c.ContentStore(), desc, pw), "export failed"))
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}()
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return pr, nil
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}
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