centos: add provisioner

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

libmachine/provision/centos.go

@@ -0,0 +1,39 @@
+package provision
+
+import (
+	"github.com/docker/machine/drivers"
+)
+
+const (
+	// TODO: eventually the RPM install process will be integrated
+	// into the get.docker.com install script; for now
+	// we install via vendored RPMs
+	dockerCentosRPMPath = "https://docker-mcn.s3.amazonaws.com/public/redhat/rpms/docker-engine-1.6.1-0.0.20150511.171646.git1b47f9f.el7.centos.x86_64.rpm"
+)
+
+func init() {
+	Register("Centos", &RegisteredProvisioner{
+		New: NewCentosProvisioner,
+	})
+}
+
+func NewCentosProvisioner(d drivers.Driver) Provisioner {
+	g := GenericProvisioner{
+		DockerOptionsDir:  "/etc/docker",
+		DaemonOptionsFile: "/usr/lib/systemd/system/docker.service",
+		OsReleaseId:       "centos",
+		Packages:          []string{},
+		Driver:            d,
+	}
+	p := &CentosProvisioner{
+		RedHatProvisioner{
+			g,
+			dockerCentosRPMPath,
+		},
+	}
+	return p
+}
+
+type CentosProvisioner struct {
+	RedHatProvisioner
+}