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LCOW: Prefer Windows over Linux in a manifest list

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When a manifest list contains both Linux and Windows images, always
prefer Windows when the platform OS is unspecified. Also, filter out any
Windows images with a higher build than the host, since they cannot run.

Signed-off-by: John Stephens <johnstep@docker.com>
This commit is contained in:
John Stephens 2018-06-28 20:30:41 -07:00
parent d912e9460e
commit ddcdb7255d
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GPG key ID: 240549B2101E94D4
1 changed files with 7 additions and 3 deletions
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10
distribution/pull_v2_windows.go
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@ -74,11 +74,14 @@ func filterManifests(manifests []manifestlist.ManifestDescriptor, p specs.Platfo
if (manifestDescriptor.Platform.Architecture == runtime.GOARCH) &&
((p.OS != "" && manifestDescriptor.Platform.OS == p.OS) || // Explicit user request for an OS we know we support
(p.OS == "" && system.IsOSSupported(manifestDescriptor.Platform.OS))) { // No user requested OS, but one we can support
matches = append(matches, manifestDescriptor)
logrus.Debugf("found match %s/%s %s with media type %s, digest %s", manifestDescriptor.Platform.OS, runtime.GOARCH, manifestDescriptor.Platform.OSVersion, manifestDescriptor.MediaType, manifestDescriptor.Digest.String())
if strings.EqualFold("windows", manifestDescriptor.Platform.OS) {
if err := checkImageCompatibility("windows", manifestDescriptor.Platform.OSVersion); err != nil {
continue
}
foundWindowsMatch = true
}
matches = append(matches, manifestDescriptor)
logrus.Debugf("found match %s/%s %s with media type %s, digest %s", manifestDescriptor.Platform.OS, runtime.GOARCH, manifestDescriptor.Platform.OSVersion, manifestDescriptor.MediaType, manifestDescriptor.Digest.String())
} else {
logrus.Debugf("ignoring %s/%s %s with media type %s, digest %s", manifestDescriptor.Platform.OS, manifestDescriptor.Platform.Architecture, manifestDescriptor.Platform.OSVersion, manifestDescriptor.MediaType, manifestDescriptor.Digest.String())
}
@ -103,7 +106,8 @@ func (mbv manifestsByVersion) Less(i, j int) bool {
// TODO: Split version by parts and compare
// TODO: Prefer versions which have a greater version number
// Move compatible versions to the top, with no other ordering changes
return versionMatch(mbv.list[i].Platform.OSVersion, mbv.version) && !versionMatch(mbv.list[j].Platform.OSVersion, mbv.version)
return (strings.EqualFold("windows", mbv.list[i].Platform.OS) && !strings.EqualFold("windows", mbv.list[j].Platform.OS)) ||
(versionMatch(mbv.list[i].Platform.OSVersion, mbv.version) && !versionMatch(mbv.list[j].Platform.OSVersion, mbv.version))
}
func (mbv manifestsByVersion) Len() int {