Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/internal/schemaversion/schemaversion.go

@@ -0,0 +1,81 @@
+// +build windows
+
+package schemaversion
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Microsoft/hcsshim/internal/schema2"
+	"github.com/Microsoft/hcsshim/osversion"
+	"github.com/sirupsen/logrus"
+)
+
+// SchemaV10 makes it easy for callers to get a v1.0 schema version object
+func SchemaV10() *hcsschema.Version {
+	return &hcsschema.Version{Major: 1, Minor: 0}
+}
+
+// SchemaV21 makes it easy for callers to get a v2.1 schema version object
+func SchemaV21() *hcsschema.Version {
+	return &hcsschema.Version{Major: 2, Minor: 1}
+}
+
+// isSupported determines if a given schema version is supported
+func IsSupported(sv *hcsschema.Version) error {
+	if IsV10(sv) {
+		return nil
+	}
+	if IsV21(sv) {
+		if osversion.Get().Build < osversion.RS5 {
+			return fmt.Errorf("unsupported on this Windows build")
+		}
+		return nil
+	}
+	return fmt.Errorf("unknown schema version %s", String(sv))
+}
+
+// IsV10 determines if a given schema version object is 1.0. This was the only thing
+// supported in RS1..3. It lives on in RS5, but will be deprecated in a future release.
+func IsV10(sv *hcsschema.Version) bool {
+	if sv.Major == 1 && sv.Minor == 0 {
+		return true
+	}
+	return false
+}
+
+// IsV21 determines if a given schema version object is 2.0. This was introduced in
+// RS4, but not fully implemented. Recommended for applications using HCS in RS5
+// onwards.
+func IsV21(sv *hcsschema.Version) bool {
+	if sv.Major == 2 && sv.Minor == 1 {
+		return true
+	}
+	return false
+}
+
+// String returns a JSON encoding of a schema version object
+func String(sv *hcsschema.Version) string {
+	b, err := json.Marshal(sv)
+	if err != nil {
+		return ""
+	}
+	return string(b[:])
+}
+
+// DetermineSchemaVersion works out what schema version to use based on build and
+// requested option.
+func DetermineSchemaVersion(requestedSV *hcsschema.Version) *hcsschema.Version {
+	sv := SchemaV10()
+	if osversion.Get().Build >= osversion.RS5 {
+		sv = SchemaV21()
+	}
+	if requestedSV != nil {
+		if err := IsSupported(requestedSV); err == nil {
+			sv = requestedSV
+		} else {
+			logrus.Warnf("Ignoring unsupported requested schema version %+v", requestedSV)
+		}
+	}
+	return sv
+}