support multi-arch images for windows via ctr

Signed-off-by: James Sturtevant <jstur@microsoft.com>

pkg/cri/platforms/default_windows.go

@@ -19,59 +19,10 @@
 package platforms
 
 import (
-	"fmt"
-	"strconv"
-	"strings"
-
 	"github.com/containerd/containerd/platforms"
-	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
-	"golang.org/x/sys/windows"
 )
 
-type matchComparer struct {
-	defaults        platforms.Matcher
-	osVersionPrefix string
-}
-
-// Match matches platform with the same windows major, minor
-// and build version.
-func (m matchComparer) Match(p imagespec.Platform) bool {
-	if m.defaults.Match(p) {
-		// TODO(windows): Figure out whether OSVersion is deprecated.
-		return strings.HasPrefix(p.OSVersion, m.osVersionPrefix)
-	}
-	return false
-}
-
-// Less sorts matched platforms in front of other platforms.
-// For matched platforms, it puts platforms with larger revision
-// number in front.
-func (m matchComparer) Less(p1, p2 imagespec.Platform) bool {
-	m1, m2 := m.Match(p1), m.Match(p2)
-	if m1 && m2 {
-		r1, r2 := revision(p1.OSVersion), revision(p2.OSVersion)
-		return r1 > r2
-	}
-	return m1 && !m2
-}
-
-func revision(v string) int {
-	parts := strings.Split(v, ".")
-	if len(parts) < 4 {
-		return 0
-	}
-	r, err := strconv.Atoi(parts[3])
-	if err != nil {
-		return 0
-	}
-	return r
-}
-
 // Default returns the current platform's default platform specification.
 func Default() platforms.MatchComparer {
-	major, minor, build := windows.RtlGetNtVersionNumbers()
+	return platforms.Default()
-	return matchComparer{
-		defaults:        platforms.Only(platforms.DefaultSpec()),
-		osVersionPrefix: fmt.Sprintf("%d.%d.%d", major, minor, build),
-	}
 }

platforms/defaults_windows.go

@@ -19,15 +19,63 @@
 package platforms
 
 import (
+	"fmt"
 	"runtime"
+	"strconv"
+	"strings"
 
+	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
+	"golang.org/x/sys/windows"
 )
 
-// Default returns the default matcher for the platform.
+type matchComparer struct {
-func Default() MatchComparer {
+	defaults        Matcher
-	return Ordered(DefaultSpec(), specs.Platform{
+	osVersionPrefix string
-		OS:           "linux",
+}
-		Architecture: runtime.GOARCH,
+
-	})
+// Match matches platform with the same windows major, minor
+// and build version.
+func (m matchComparer) Match(p imagespec.Platform) bool {
+	if m.defaults.Match(p) {
+		// TODO(windows): Figure out whether OSVersion is deprecated.
+		return strings.HasPrefix(p.OSVersion, m.osVersionPrefix)
+	}
+	return false
+}
+
+// Less sorts matched platforms in front of other platforms.
+// For matched platforms, it puts platforms with larger revision
+// number in front.
+func (m matchComparer) Less(p1, p2 imagespec.Platform) bool {
+	m1, m2 := m.Match(p1), m.Match(p2)
+	if m1 && m2 {
+		r1, r2 := revision(p1.OSVersion), revision(p2.OSVersion)
+		return r1 > r2
+	}
+	return m1 && !m2
+}
+
+func revision(v string) int {
+	parts := strings.Split(v, ".")
+	if len(parts) < 4 {
+		return 0
+	}
+	r, err := strconv.Atoi(parts[3])
+	if err != nil {
+		return 0
+	}
+	return r
+}
+
+// Default returns the current platform's default platform specification.
+func Default() MatchComparer {
+	major, minor, build := windows.RtlGetNtVersionNumbers()
+	return matchComparer{
+		defaults: Ordered(DefaultSpec(), specs.Platform{
+			OS:           "linux",
+			Architecture: runtime.GOARCH,
+		}),
+		osVersionPrefix: fmt.Sprintf("%d.%d.%d", major, minor, build),
+	}
 }

platforms/defaults_windows_test.go

@@ -22,14 +22,13 @@ import (
 	"sort"
 	"testing"
 
-	"github.com/containerd/containerd/platforms"
 	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestMatchComparerMatch(t *testing.T) {
 	m := matchComparer{
-		defaults: platforms.Only(imagespec.Platform{
+		defaults: Only(imagespec.Platform{
 			Architecture: "amd64",
 			OS:           "windows",
 		}),
@@ -85,7 +84,7 @@ func TestMatchComparerMatch(t *testing.T) {
 
 func TestMatchComparerLess(t *testing.T) {
 	m := matchComparer{
-		defaults: platforms.Only(imagespec.Platform{
+		defaults: Only(imagespec.Platform{
 			Architecture: "amd64",
 			OS:           "windows",
 		}),