service: support /var/lib/faasd/.docker/config.json

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

vendor/github.com/docker/docker/pkg/system/lcow.go

@@ -0,0 +1,32 @@
+package system // import "github.com/docker/docker/pkg/system"
+
+import (
+	"runtime"
+	"strings"
+
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+// IsOSSupported determines if an operating system is supported by the host
+func IsOSSupported(os string) bool {
+	if strings.EqualFold(runtime.GOOS, os) {
+		return true
+	}
+	if LCOWSupported() && strings.EqualFold(os, "linux") {
+		return true
+	}
+	return false
+}
+
+// ValidatePlatform determines if a platform structure is valid.
+// TODO This is a temporary windows-only function, should be replaced by
+// comparison of worker capabilities
+func ValidatePlatform(platform specs.Platform) error {
+	if runtime.GOOS == "windows" {
+		if !(platform.OS == runtime.GOOS || (LCOWSupported() && platform.OS == "linux")) {
+			return errors.Errorf("unsupported os %s", platform.OS)
+		}
+	}
+	return nil
+}