Move around code for better clarity

pkg/init/sharedroot/sharedroot.go

@@ -0,0 +1,32 @@
+package sharedroot
+
+import (
+	"os"
+
+	"github.com/docker/docker/pkg/mount"
+	"github.com/rancher/os/config"
+	"github.com/rancher/os/pkg/init/fsmount"
+)
+
+func Setup(c *config.CloudConfig) (*config.CloudConfig, error) {
+	if c.Rancher.NoSharedRoot {
+		return c, nil
+	}
+
+	if fsmount.IsInitrd() {
+		for _, i := range []string{"/mnt", "/media", "/var/lib/system-docker"} {
+			if err := os.MkdirAll(i, 0755); err != nil {
+				return c, err
+			}
+			if err := mount.Mount("tmpfs", i, "tmpfs", "rw"); err != nil {
+				return c, err
+			}
+			if err := mount.MakeShared(i); err != nil {
+				return c, err
+			}
+		}
+		return c, nil
+	}
+
+	return c, mount.MakeShared("/")
+}