Create Qemu command wrapper

Creates a wrapper around the Qemu command line implementation to prevent
the need to hard-code the different command line options in Init and
Start.

Signed-off-by: Jake Correnti <jakecorrenti+github@proton.me>

pkg/machine/qemu/qemu_command_test.go

@@ -0,0 +1,67 @@
+//go:build (amd64 && !windows) || (arm64 && !windows)
+// +build amd64,!windows arm64,!windows
+
+package qemu
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/containers/podman/v4/pkg/machine"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestQemuCmd(t *testing.T) {
+	ignFile, err := machine.NewMachineFile(t.TempDir()+"demo-ignition-file.ign", nil)
+	assert.NoError(t, err)
+
+	machineAddrFile, err := machine.NewMachineFile(t.TempDir()+"tmp.sock", nil)
+	assert.NoError(t, err)
+
+	readySocket, err := machine.NewMachineFile(t.TempDir()+"readySocket.sock", nil)
+	assert.NoError(t, err)
+
+	vmPidFile, err := machine.NewMachineFile(t.TempDir()+"vmpidfile.pid", nil)
+	assert.NoError(t, err)
+
+	monitor := Monitor{
+		Address: *machineAddrFile,
+		Network: "unix",
+		Timeout: 3,
+	}
+	ignPath := ignFile.GetPath()
+	addrFilePath := machineAddrFile.GetPath()
+	readySocketPath := readySocket.GetPath()
+	vmPidFilePath := vmPidFile.GetPath()
+	bootableImagePath := t.TempDir() + "test-machine_fedora-coreos-38.20230918.2.0-qemu.x86_64.qcow2"
+
+	cmd := NewQemuBuilder("/usr/bin/qemu-system-x86_64", []string{})
+	cmd.SetMemory(2048)
+	cmd.SetCPUs(4)
+	cmd.SetIgnitionFile(*ignFile)
+	cmd.SetQmpMonitor(monitor)
+	cmd.SetNetwork()
+	cmd.SetSerialPort(*readySocket, *vmPidFile, "test-machine")
+	cmd.SetVirtfsMount("/tmp/path", "vol10", "none", true)
+	cmd.SetBootableImage(bootableImagePath)
+	cmd.SetDisplay("none")
+
+	expected := []string{
+		"/usr/bin/qemu-system-x86_64",
+		"-m", "2048",
+		"-smp", "4",
+		"-fw_cfg", fmt.Sprintf("name=opt/com.coreos/config,file=%s", ignPath),
+		"-qmp", fmt.Sprintf("unix:%s,server=on,wait=off", addrFilePath),
+		"-netdev", "socket,id=vlan,fd=3",
+		"-device", "virtio-net-pci,netdev=vlan,mac=5a:94:ef:e4:0c:ee",
+		"-device", "virtio-serial",
+		"-chardev", fmt.Sprintf("socket,path=%s,server=on,wait=off,id=atest-machine_ready", readySocketPath),
+		"-device", "virtserialport,chardev=atest-machine_ready,name=org.fedoraproject.port.0",
+		"-pidfile", vmPidFilePath,
+		"-virtfs", "local,path=/tmp/path,mount_tag=vol10,security_model=none,readonly",
+		"-drive", fmt.Sprintf("if=virtio,file=%s", bootableImagePath),
+		"-display", "none"}
+
+	require.Equal(t, cmd.Build(), expected)
+}