Refactors getRootIDs

Signed-off-by: John Howard <jhoward@microsoft.com>

runtime/spec_windows.go

@@ -0,0 +1,32 @@
+package runtime
+
+type Spec struct {
+	// Version is the version of the specification that is supported.
+	Version string `json:"ociVersion"`
+	// Platform is the host information for OS and Arch.
+	// TEMPORARY HACK Platform Platform `json:"platform"`
+	// Process is the container's main process.
+	// TEMPORARY HACK Process Process `json:"process"`
+	// Root is the root information for the container's filesystem.
+	// TEMPORARY HACK Root Root `json:"root"`
+	// Hostname is the container's host name.
+	// TEMPORARY HACK Hostname string `json:"hostname,omitempty"`
+	// Mounts profile configuration for adding mounts to the container's filesystem.
+	// TEMPORARY HACK Mounts []Mount `json:"mounts"`
+	// Hooks are the commands run at various lifecycle events of the container.
+	// TEMPORARY HACK Hooks Hooks `json:"hooks"`
+}
+
+// TODO Windows - Interim hack. Needs implementing.
+type WindowsSpec struct {
+	Spec
+
+	// Windows is platform specific configuration for Windows based containers.
+	Windows Windows `json:"windows"`
+}
+
+// Windows contains platform specific configuration for Windows based containers.
+type Windows struct {
+}
+
+type platformSpec WindowsSpec