Add --uts=host to allow sharing the UTS namespace

Signed-off-by: Darren Shepherd <darren@rancher.com>

daemon/execdriver/driver.go

@@ -86,6 +86,11 @@ type Pid struct {
 	HostPid bool `json:"host_pid"`
 }
 
+// UTS settings of the container
+type UTS struct {
+	HostUTS bool `json:"host_uts"`
+}
+
 type NetworkInterface struct {
 	Gateway              string `json:"gateway"`
 	IPAddress            string `json:"ip"`
@@ -155,6 +160,7 @@ type Command struct {
 	Network            *Network          `json:"network"`
 	Ipc                *Ipc              `json:"ipc"`
 	Pid                *Pid              `json:"pid"`
+	UTS                *UTS              `json:"uts"`
 	Resources          *Resources        `json:"resources"`
 	Mounts             []Mount           `json:"mounts"`
 	AllowedDevices     []*configs.Device `json:"allowed_devices"`

daemon/execdriver/native/create.go

@@ -29,6 +29,10 @@ func (d *driver) createContainer(c *execdriver.Command) (*configs.Config, error)
 		return nil, err
 	}
 
+	if err := d.createUTS(container, c); err != nil {
+		return nil, err
+	}
+
 	if err := d.createNetwork(container, c); err != nil {
 		return nil, err
 	}
@@ -173,6 +177,16 @@ func (d *driver) createPid(container *configs.Config, c *execdriver.Command) err
 	return nil
 }
 
+func (d *driver) createUTS(container *configs.Config, c *execdriver.Command) error {
+	if c.UTS.HostUTS {
+		container.Namespaces.Remove(configs.NEWUTS)
+		container.Hostname = ""
+		return nil
+	}
+
+	return nil
+}
+
 func (d *driver) setPrivileged(container *configs.Config) (err error) {
 	container.Capabilities = execdriver.GetAllCapabilities()
 	container.Cgroups.AllowAllDevices = true