use constant for timesync port and update mac_env.sh to print krunkit version

Signed-off-by: Gunjan Vyas <vyasgun20@gmail.com>

contrib/cirrus/mac_env.sh

@@ -24,3 +24,6 @@ go env
 # The latest version is installed system-wide when instances are created. Make the
 # current version known.
 vfkit --version
+
+# Make the current version of krunkit known.
+krunkit --version

pkg/machine/apple/apple.go

@@ -180,7 +180,7 @@ func StartGenericAppleVM(mc *vmconfigs.MachineConfig, cmdBinary string, bootload
 	}
 	vm.Devices = append(vm.Devices, mounts...)
 
-	timesync, err := vfConfig.TimeSyncNew(1234)
+	timesync, err := vfConfig.TimeSyncNew(define.TimeSyncVsockPort)
 	if err != nil {
 		return nil, nil, err
 	}

pkg/machine/define/config.go

@@ -6,6 +6,9 @@ const (
 	UserCertsTargetPath = "/etc/containers/certs.d"
 	DefaultIdentityName = "machine"
 	DefaultMachineName  = "podman-machine-default"
+	// TimeSyncVsockPort is the vsock port for host->guest time sync via qemu-guest-agent.
+	// Podman passes this to vfkit/krunkit --timesync; podman-machine-os configures qemu-guest-agent on the same port.
+	TimeSyncVsockPort = 1234
 )
 
 // MountTag is an identifier to mount a VirtioFS file system tag on a mount point in the VM.