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imagestream.go
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/
imagestream.go
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package mirror
// Copyright (c) Microsoft Corporation.
// Licensed under the Apache License 2.0.
import (
"archive/tar"
"bufio"
"bytes"
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"github.com/containers/image/v5/docker"
"github.com/containers/image/v5/pkg/blobinfocache/memory"
"github.com/containers/image/v5/types"
imagev1 "github.com/openshift/api/image/v1"
)
func getReleaseImageStream(ctx context.Context, reference string, auth *types.DockerAuthConfig) (*imagev1.ImageStream, error) {
systemctx := &types.SystemContext{
DockerAuthConfig: auth,
}
ref, err := docker.ParseReference("//" + reference)
if err != nil {
return nil, err
}
img, err := ref.NewImage(ctx, systemctx)
if err != nil {
return nil, err
}
defer img.Close()
src, err := ref.NewImageSource(ctx, systemctx)
if err != nil {
return nil, err
}
defer src.Close()
layerInfos := img.LayerInfos()
for i := len(layerInfos) - 1; i >= 0; i-- {
rc, _, err := src.GetBlob(ctx, layerInfos[i], memory.New())
if err != nil {
return nil, err
}
defer rc.Close()
br := bufio.NewReader(rc)
b, err := br.Peek(2)
if err != nil {
return nil, err
}
var r io.Reader = br
if bytes.Equal(b, []byte("\x1f\x8b")) {
gr, err := gzip.NewReader(br)
if err != nil {
return nil, err
}
defer gr.Close()
r = gr
}
tr := tar.NewReader(r)
for {
h, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
switch h.Name {
case "release-manifests/image-references":
var is *imagev1.ImageStream
err = json.NewDecoder(tr).Decode(&is)
if err != nil {
return nil, err
}
return is, nil
}
}
}
return nil, fmt.Errorf("image references not found")
}