feat(machine/xen): Introduce Xen support

Signed-off-by: Andrei Stan <[email protected]>

Author: andreistan26

go.mod

@@ -78,6 +78,7 @@ require (
 	oras.land/oras-go/v2 v2.5.0
 	sdk.kraft.cloud v0.5.5-0.20240410102038-8d0f0333b17a
 	sigs.k8s.io/kustomize/kyaml v0.14.3
+	xenbits.xenproject.org/git-http/xen.git/tools/golang/xenlight v0.0.0-20240402142354-17cf285d87e2
 )
 
 require (

go.sum

@@ -1695,3 +1695,5 @@ sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo=
 sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8=
+xenbits.xenproject.org/git-http/xen.git/tools/golang/xenlight v0.0.0-20240402142354-17cf285d87e2 h1:f3OAMM0NgzlqWqZnuTIz6B6HPK1pGGfgKH6S94kYEWY=
+xenbits.xenproject.org/git-http/xen.git/tools/golang/xenlight v0.0.0-20240402142354-17cf285d87e2/go.mod h1:tbZ4iMnk8RWkXPxTiCGdAw3hCOa3feShlf3sBh50uIc=

machine/platform/register_linux.go

@@ -14,6 +14,7 @@ import (
 	"kraftkit.sh/internal/set"
 	"kraftkit.sh/machine/firecracker"
 	"kraftkit.sh/store"
+	"kraftkit.sh/machine/xen"
 )
 
 var firecrackerV1alpha1Driver = func(ctx context.Context, opts ...any) (machinev1alpha1.MachineService, error) {
@@ -43,6 +44,30 @@ var firecrackerV1alpha1Driver = func(ctx context.Context, opts ...any) (machinev
 	)
 }
 
+var xenV1alpha1Driver = func(ctx context.Context, opts ...any) (machinev1alpha1.MachineService, error) {
+	service, err := xen.NewMachineV1alpha1Service(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	embeddedStore, err := store.NewEmbeddedStore[machinev1alpha1.MachineSpec, machinev1alpha1.MachineStatus](
+		filepath.Join(
+			config.G[config.KraftKit](ctx).RuntimeDir,
+			"machinev1alpha1",
+		),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return machinev1alpha1.NewMachineServiceHandler(
+		ctx,
+		service,
+		zip.WithStore[machinev1alpha1.MachineSpec, machinev1alpha1.MachineStatus](embeddedStore, zip.StoreRehydrationSpecNil),
+		zip.WithBefore(storePlatformFilter(PlatformXen)),
+	)
+}
+
 func unixVariantStrategies() map[Platform]*Strategy {
 	// TODO(jake-ciolek): The firecracker driver has a dependency on github.com/containernetworking/plugins/pkg/ns via
 	// github.com/firecracker-microvm/firecracker-go-sdk
@@ -51,5 +76,8 @@ func unixVariantStrategies() map[Platform]*Strategy {
 		PlatformFirecracker: {
 			NewMachineV1alpha1: firecrackerV1alpha1Driver,
 		},
+		PlatformXen: {
+			NewMachineV1alpha1: xenV1alpha1Driver,
+		},
 	}
 }

machine/xen/init.go

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
+// Licensed under the BSD-3-Clause License (the "License").
+// You may not use this file except in compliance with the License.
+
+//go:build xen
+// +build xen
+
+package xen
+
+import (
+	"encoding/gob"
+
+	"xenbits.xenproject.org/git-http/xen.git/tools/golang/xenlight"
+)
+
+func init() {
+	gob.Register(xenlight.Domid(0))
+}

machine/xen/stub.go

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
+// Licensed under the BSD-3-Clause License (the "License").
+// You may not use this file except in compliance with the License.
+
+//go:build !xen
+// +build !xen
+
+package xen
+
+import (
+	"context"
+	"fmt"
+
+	machinev1alpha1 "kraftkit.sh/api/machine/v1alpha1"
+)
+
+func NewMachineV1alpha1Service(ctx context.Context) (machinev1alpha1.MachineService, error) {
+	return nil, fmt.Errorf("xen support is not enabled")
+}