mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
109 lines
3.4 KiB
Go
109 lines
3.4 KiB
Go
package distribution // import "github.com/docker/docker/distribution"
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import (
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"fmt"
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"net/http"
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"os"
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"runtime"
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"sort"
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"strings"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/manifest/manifestlist"
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"github.com/docker/distribution/manifest/schema2"
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"github.com/docker/distribution/registry/client/transport"
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"github.com/docker/docker/pkg/system"
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"github.com/sirupsen/logrus"
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)
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var _ distribution.Describable = &v2LayerDescriptor{}
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func (ld *v2LayerDescriptor) Descriptor() distribution.Descriptor {
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if ld.src.MediaType == schema2.MediaTypeForeignLayer && len(ld.src.URLs) > 0 {
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return ld.src
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}
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return distribution.Descriptor{}
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}
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func (ld *v2LayerDescriptor) open(ctx context.Context) (distribution.ReadSeekCloser, error) {
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blobs := ld.repo.Blobs(ctx)
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rsc, err := blobs.Open(ctx, ld.digest)
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if len(ld.src.URLs) == 0 {
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return rsc, err
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}
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// We're done if the registry has this blob.
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if err == nil {
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// Seek does an HTTP GET. If it succeeds, the blob really is accessible.
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if _, err = rsc.Seek(0, os.SEEK_SET); err == nil {
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return rsc, nil
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}
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rsc.Close()
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}
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// Find the first URL that results in a 200 result code.
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for _, url := range ld.src.URLs {
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logrus.Debugf("Pulling %v from foreign URL %v", ld.digest, url)
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rsc = transport.NewHTTPReadSeeker(http.DefaultClient, url, nil)
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// Seek does an HTTP GET. If it succeeds, the blob really is accessible.
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_, err = rsc.Seek(0, os.SEEK_SET)
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if err == nil {
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break
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}
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logrus.Debugf("Download for %v failed: %v", ld.digest, err)
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rsc.Close()
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rsc = nil
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}
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return rsc, err
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}
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func filterManifests(manifests []manifestlist.ManifestDescriptor, os string) []manifestlist.ManifestDescriptor {
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osVersion := ""
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if os == "windows" {
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// TODO: Add UBR (Update Build Release) component after build
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version := system.GetOSVersion()
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osVersion = fmt.Sprintf("%d.%d.%d", version.MajorVersion, version.MinorVersion, version.Build)
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logrus.Debugf("will prefer entries with version %s", osVersion)
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}
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var matches []manifestlist.ManifestDescriptor
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for _, manifestDescriptor := range manifests {
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// TODO: Consider filtering out greater versions, including only greater UBR
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if manifestDescriptor.Platform.Architecture == runtime.GOARCH && manifestDescriptor.Platform.OS == os {
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matches = append(matches, manifestDescriptor)
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logrus.Debugf("found match for %s/%s with media type %s, digest %s", os, runtime.GOARCH, manifestDescriptor.MediaType, manifestDescriptor.Digest.String())
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}
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}
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if os == "windows" {
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sort.Stable(manifestsByVersion{osVersion, matches})
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}
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return matches
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}
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func versionMatch(actual, expected string) bool {
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// Check whether the version matches up to the build, ignoring UBR
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return strings.HasPrefix(actual, expected+".")
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}
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type manifestsByVersion struct {
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version string
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list []manifestlist.ManifestDescriptor
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}
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func (mbv manifestsByVersion) Less(i, j int) bool {
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// TODO: Split version by parts and compare
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// TODO: Prefer versions which have a greater version number
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// Move compatible versions to the top, with no other ordering changes
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return versionMatch(mbv.list[i].Platform.OSVersion, mbv.version) && !versionMatch(mbv.list[j].Platform.OSVersion, mbv.version)
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}
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func (mbv manifestsByVersion) Len() int {
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return len(mbv.list)
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}
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func (mbv manifestsByVersion) Swap(i, j int) {
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mbv.list[i], mbv.list[j] = mbv.list[j], mbv.list[i]
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}
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