Add support for Flatcar Container Linux

libmachine/provision/coreos.go

@@ -25,13 +25,15 @@ EOF
 
 func init() {
 	Register("CoreOS", &RegisteredProvisioner{
-		New: NewCoreOSProvisioner,
+		New: func(d drivers.Driver) Provisioner {
+			return NewCoreOSProvisioner("coreos", d)
+		},
 	})
 }
 
-func NewCoreOSProvisioner(d drivers.Driver) Provisioner {
+func NewCoreOSProvisioner(osReleaseID string, d drivers.Driver) *CoreOSProvisioner {
 	return &CoreOSProvisioner{
-		NewSystemdProvisioner("coreos", d),
+		NewSystemdProvisioner(osReleaseID, d),
 	}
 }
 

libmachine/provision/flatcar.go

@@ -0,0 +1,25 @@
+package provision
+
+import (
+	"github.com/rancher/machine/libmachine/drivers"
+)
+
+func init() {
+	Register("Flatcar", &RegisteredProvisioner{
+		New: NewFlatcarProvisioner,
+	})
+}
+
+func NewFlatcarProvisioner(d drivers.Driver) Provisioner {
+	return &FlatcarProvisioner{
+		NewCoreOSProvisioner("flatcar", d),
+	}
+}
+
+type FlatcarProvisioner struct {
+	*CoreOSProvisioner
+}
+
+func (provisioner *FlatcarProvisioner) String() string {
+	return "flatcar"
+}