Add ext driver for external VM machines

Signed-off-by: Anders F Björklund <[email protected]>

Author: afbjorklund

pkg/driverutil/driverutil.go

@@ -18,5 +18,6 @@ func Drivers() []string {
 	if wsl2.Enabled {
 		drivers = append(drivers, limayaml.WSL2)
 	}
+	drivers = append(drivers, limayaml.EXT)
 	return drivers
 }

pkg/driverutil/instance.go

@@ -5,6 +5,7 @@ package driverutil
 
 import (
 	"github.com/lima-vm/lima/pkg/driver"
+	"github.com/lima-vm/lima/pkg/ext"
 	"github.com/lima-vm/lima/pkg/limayaml"
 	"github.com/lima-vm/lima/pkg/qemu"
 	"github.com/lima-vm/lima/pkg/vz"
@@ -19,5 +20,8 @@ func CreateTargetDriverInstance(base *driver.BaseDriver) driver.Driver {
 	if *limaDriver == limayaml.WSL2 {
 		return wsl2.New(base)
 	}
+	if *limaDriver == limayaml.EXT {
+		return ext.New(base)
+	}
 	return qemu.New(base)
 }

pkg/ext/ext_driver.go

@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: Copyright The Lima Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package ext
+
+import (
+	"github.com/lima-vm/lima/pkg/driver"
+)
+
+type LimaExtDriver struct {
+	*driver.BaseDriver
+}
+
+func New(driver *driver.BaseDriver) *LimaExtDriver {
+	return &LimaExtDriver{
+		BaseDriver: driver,
+	}
+}

pkg/limayaml/defaults.go

@@ -1109,6 +1109,8 @@ func NewVMType(driver string) VMType {
 		return QEMU
 	case "wsl2":
 		return WSL2
+	case "ext":
+		return EXT
 	default:
 		logrus.Warnf("Unknown driver: %s", driver)
 		return driver

pkg/limayaml/limayaml.go

@@ -87,13 +87,14 @@ const (
 	QEMU VMType = "qemu"
 	VZ   VMType = "vz"
 	WSL2 VMType = "wsl2"
+	EXT  VMType = "ext"
 )
 
 var (
 	OSTypes    = []OS{LINUX}
 	ArchTypes  = []Arch{X8664, AARCH64, ARMV7L, RISCV64, S390X}
 	MountTypes = []MountType{REVSSHFS, NINEP, VIRTIOFS, WSLMount}
-	VMTypes    = []VMType{QEMU, VZ, WSL2}
+	VMTypes    = []VMType{QEMU, VZ, WSL2, EXT}
 )
 
 type User struct {

pkg/limayaml/validate.go

@@ -92,11 +92,13 @@ func Validate(y *LimaYAML, warn bool) error {
 		if !IsNativeArch(*y.Arch) {
 			return fmt.Errorf("field `arch` must be %q for VZ; got %q", NewArch(runtime.GOARCH), *y.Arch)
 		}
+	case EXT:
+		// NOP
 	default:
-		return fmt.Errorf("field `vmType` must be %q, %q, %q; got %q", QEMU, VZ, WSL2, *y.VMType)
+		return fmt.Errorf("field `vmType` must be %q, %q, %q, %q; got %q", QEMU, VZ, WSL2, EXT, *y.VMType)
 	}
 
-	if len(y.Images) == 0 {
+	if len(y.Images) == 0 && *y.VMType != EXT {
 		return errors.New("field `images` must be set")
 	}
 	for i, f := range y.Images {
@@ -187,6 +189,9 @@ func Validate(y *LimaYAML, warn bool) error {
 		}
 	}
 
+	if *y.SSH.Address == "127.0.0.1" && *y.VMType == EXT {
+		return errors.New("field `ssh.address` must be set, for ext")
+	}
 	if y.SSH.Address != nil {
 		if err := validateHost("ssh.address", *y.SSH.Address); err != nil {
 			return err

pkg/store/instance.go

@@ -191,6 +191,14 @@ func inspectStatusWithPIDFiles(instDir string, inst *Instance, y *limayaml.LimaY
 		inst.Status = StatusBroken
 		inst.Errors = append(inst.Errors, err)
 	}
+	if *y.VMType == limayaml.EXT {
+		if inst.HostAgentPID > 0 {
+			inst.Status = StatusRunning
+		} else if inst.HostAgentPID == 0 {
+			inst.Status = StatusStopped
+		}
+		return
+	}
 
 	if inst.Status == StatusUnknown {
 		switch {