Refactors getRootIDs

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

runtime/container.go

@@ -246,14 +246,14 @@ func (c *container) Exec(pid string, spec specs.Process, s Stdio) (Process, erro
 	return p, nil
 }
 
-func (c *container) readSpec() (*specs.LinuxSpec, error) {
-	var spec specs.LinuxSpec
+func (c *container) readSpec() (*platformSpec, error) {
+	var spec platformSpec
 	f, err := os.Open(filepath.Join(c.bundle, "config.json"))
 	if err != nil {
 		return nil, err
 	}
 	defer f.Close()
-	if err := json.NewDecoder(f).Decode(&spec); err != nil {
+	if err := json.NewDecoder(f).Decode(&spec.Spec); err != nil {
 		return nil, err
 	}
 	return &spec, nil
@@ -389,25 +389,6 @@ func (c *container) getLibctContainer() (libcontainer.Container, error) {
 	return f.Load(c.id)
 }
 
-func getRootIDs(s *specs.LinuxSpec) (int, int, error) {
-	if s == nil {
-		return 0, 0, nil
-	}
-	var hasUserns bool
-	for _, ns := range s.Linux.Namespaces {
-		if ns.Type == specs.UserNamespace {
-			hasUserns = true
-			break
-		}
-	}
-	if !hasUserns {
-		return 0, 0, nil
-	}
-	uid := hostIDFromMap(0, s.Linux.UIDMappings)
-	gid := hostIDFromMap(0, s.Linux.GIDMappings)
-	return uid, gid, nil
-}
-
 func hostIDFromMap(id uint32, mp []specs.IDMapping) int {
 	for _, m := range mp {
 		if (id >= m.ContainerID) && (id <= (m.ContainerID + m.Size - 1)) {

runtime/container_linux.go

@@ -0,0 +1,22 @@
+package runtime
+
+import "github.com/opencontainers/specs"
+
+func getRootIDs(s *platformSpec) (int, int, error) {
+	if s == nil {
+		return 0, 0, nil
+	}
+	var hasUserns bool
+	for _, ns := range s.Linux.Namespaces {
+		if ns.Type == specs.UserNamespace {
+			hasUserns = true
+			break
+		}
+	}
+	if !hasUserns {
+		return 0, 0, nil
+	}
+	uid := hostIDFromMap(0, s.Linux.UIDMappings)
+	gid := hostIDFromMap(0, s.Linux.GIDMappings)
+	return uid, gid, nil
+}

runtime/container_windows.go

@@ -0,0 +1,5 @@
+package runtime
+
+func getRootIDs(s *platformSpec) (int, int, error) {
+	return 0, 0, nil
+}

runtime/process.go

@@ -44,7 +44,7 @@ type processConfig struct {
 	id          string
 	root        string
 	processSpec specs.Process
-	spec        *specs.LinuxSpec
+	spec        *platformSpec
 	c           *container
 	stdio       Stdio
 	exec        bool

runtime/spec_linux.go

@@ -0,0 +1,5 @@
+package runtime
+
+import "github.com/opencontainers/specs"
+
+type platformSpec specs.LinuxSpec

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