Add PWD_HOST_FQDN env variable to instances.

pwd/instance.go

@@ -66,6 +66,7 @@ type InstanceConfig struct {
 	CACert     []byte
 	Cert       []byte
 	Key        []byte
+	Host       string
 }
 
 func (i *Instance) setUsedPort(port uint16) {
@@ -223,6 +224,7 @@ func (p *pwd) InstanceNew(session *Session, conf InstanceConfig) (*Instance, err
 		ServerKey:     conf.ServerKey,
 		CACert:        conf.CACert,
 		Privileged:    false,
+		HostFQDN:      conf.Host,
 	}
 
 	for _, imageName := range p.InstanceAllowedImages() {

pwd/instance_test.go

@@ -57,7 +57,7 @@ func TestInstanceNew(t *testing.T) {
 
 	assert.Nil(t, err)
 
-	instance, err := p.InstanceNew(session, InstanceConfig{})
+	instance, err := p.InstanceNew(session, InstanceConfig{Host: "something.play-with-docker.com"})
 
 	assert.Nil(t, err)
 
@@ -83,6 +83,7 @@ func TestInstanceNew(t *testing.T) {
 		ServerKey:     nil,
 		CACert:        nil,
 		Privileged:    true,
+		HostFQDN:      "something.play-with-docker.com",
 	}
 	assert.Equal(t, expectedContainerOpts, containerOpts)
 }