WIP : Add support for OSv in urunc

README.md

@@ -147,6 +147,7 @@ supported VM/Sandbox monitors and unikernels:
 | Mewz      | QEMU                       | x86         | In-memory                               |
 | Linux     | QEMU, Firecracker          | x86         | Initrd, Block/Devmapper, 9pfs, Virtiofs |
 | Hermit    | QEMU                       | x86         | Initrd                                  |
+OSv         | QEMU                      | x86          | initrd
 
 We plan to add support for more unikernel frameworks and other platforms too.
 Feel free to [contact](#Contact) us for a specific unikernel framework or similar

pkg/unikontainers/unikernels/OSv.go

@@ -0,0 +1,108 @@
+// Copyright (c) 2023-2026, Nubificus LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package unikernels
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/urunc-dev/urunc/pkg/unikontainers/types"
+)
+
+const OSvUnikernel string = "osv"
+
+type OSv struct {
+	Command string
+	Monitor string
+	Env     []string
+	Net     OSvNet
+	VFS     OSvVFS
+}
+
+type OSvNet struct {
+	Address string
+	Mask    string
+	Gateway string
+}
+
+type OSvVFS struct {
+	RootFS string
+}
+
+func (o *OSv) CommandString() (string, error) {
+	envVarString := ""
+	if len(o.Env) > 0 {
+		envVarString = "env=" + strings.Join(o.Env, ",")
+	}
+
+	return fmt.Sprintf("%s %s %s %s %s -- %s",
+		o.Command,
+		envVarString,
+		o.Net.Address,
+		o.Net.Gateway,
+		o.Net.Mask,
+		o.VFS.RootFS), nil
+}
+
+func (o *OSv) SupportsBlock() bool {
+	return true 
+}
+
+func (o *OSv) SupportsFS(fsType string) bool {
+	switch fsType {
+	case "block":
+		return true
+	default:
+		return false
+	}
+}
+
+func (o *OSv) MonitorNetCli(ifName string, mac string) string {
+	// OSv with QEMU uses standard virtio-net configuration
+	return ""
+}
+
+func (o *OSv) MonitorBlockCli() []types.MonitorBlockArgs {
+	return nil
+}
+
+func (o *OSv) MonitorCli() types.MonitorCliArgs {
+	return types.MonitorCliArgs{}
+}
+
+func (o *OSv) Init(data types.UnikernelParams) error {
+	o.Env = data.EnvVars
+	o.Monitor = data.Monitor
+	o.Command = strings.Join(data.CmdLine, " ")
+
+	// Configure networking
+	if data.Net.IP != "" {
+		o.Net.Address = "gw=" + data.Net.Gateway
+		o.Net.Mask = "netmask=" + data.Net.Mask
+		o.Net.Gateway = "ip=" + data.Net.IP
+	}
+
+	// Configure filesystem
+	if len(data.Block) > 0 {
+		o.VFS.RootFS = "root=/dev/vda"
+	}
+
+	return nil
+}
+
+func newOSv() *OSv {
+	osvStruct := new(OSv)
+	return osvStruct
+}

pkg/unikontainers/unikernels/unikernel.go

@@ -42,6 +42,9 @@ func New(unikernelType string) (types.Unikernel, error) {
 	case HermitUnikernel:
 		unikernel := newHermit()
 		return unikernel, nil
+	case OSvUnikernel:
+		unikernel := newOSv()
+		return unikernel, nil
 	default:
 		return nil, ErrNotSupportedUnikernel
 	}