implemented blockDeviceIdentifier

osversion_test.go

@@ -161,6 +161,25 @@ func TestAvailableVersion(t *testing.T) {
 			}
 		}
 	})
+
+	t.Run("macOS 12.3", func(t *testing.T) {
+		majorMinorVersion = 12
+		cases := map[string]func() error{
+			"BlockDeviceIdentifier": func() error {
+				_, err := (*VirtioBlockDeviceConfiguration)(nil).BlockDeviceIdentifier()
+				return err
+			},
+			"SetBlockDeviceIdentifier": func() error {
+				return (*VirtioBlockDeviceConfiguration)(nil).SetBlockDeviceIdentifier("")
+			},
+		}
+		for name, fn := range cases {
+			err := fn()
+			if !errors.Is(err, ErrUnsupportedOSVersion) {
+				t.Fatalf("unexpected error %v in %s", err, name)
+			}
+		}
+	})
 }
 
 func Test_fetchMajorMinorVersion(t *testing.T) {

storage.go

@@ -4,6 +4,7 @@ package vz
 #cgo darwin CFLAGS: -x objective-c -fno-objc-arc
 #cgo darwin LDFLAGS: -lobjc -framework Foundation -framework Virtualization
 # include "virtualization.h"
+# include "virtualization_12_3.h"
 # include "virtualization_13.h"
 */
 import "C"
@@ -104,6 +105,8 @@ type VirtioBlockDeviceConfiguration struct {
 	*pointer
 
 	*baseStorageDeviceConfiguration
+
+	blockDeviceIdentifier string
 }
 
 // NewVirtioBlockDeviceConfiguration initialize a VZVirtioBlockDeviceConfiguration with a device attachment.
@@ -130,6 +133,48 @@ func NewVirtioBlockDeviceConfiguration(attachment StorageDeviceAttachment) (*Vir
 	return config, nil
 }
 
+// BlockDeviceIdentifier returns the device identifier is a string identifying the Virtio block device.
+// Empty string by default.
+//
+// The identifier can be retrieved in the guest via a VIRTIO_BLK_T_GET_ID request.
+//
+// This is only supported on macOS 12.3 and newer, error will be returned on older versions.
+//
+// see: https://developer.apple.com/documentation/virtualization/vzvirtioblockdeviceconfiguration/3917717-blockdeviceidentifier
+func (v *VirtioBlockDeviceConfiguration) BlockDeviceIdentifier() (string, error) {
+	if err := macOSAvailable(12.3); err != nil {
+		return "", err
+	}
+	return v.blockDeviceIdentifier, nil
+}
+
+// SetBlockDeviceIdentifier sets the device identifier is a string identifying the Virtio block device.
+//
+// The device identifier must be at most 20 bytes in length and ASCII-encodable.
+//
+// This is only supported on macOS 12.3 and newer, error will be returned on older versions.
+//
+// see: https://developer.apple.com/documentation/virtualization/vzvirtioblockdeviceconfiguration/3917717-blockdeviceidentifier
+func (v *VirtioBlockDeviceConfiguration) SetBlockDeviceIdentifier(identifier string) error {
+	if err := macOSAvailable(12.3); err != nil {
+		return err
+	}
+	idChar := charWithGoString(identifier)
+	defer idChar.Free()
+
+	nserrPtr := newNSErrorAsNil()
+	C.setBlockDeviceIdentifierVZVirtioBlockDeviceConfiguration(
+		objc.Ptr(v),
+		idChar.CString(),
+		&nserrPtr,
+	)
+	if err := newNSError(nserrPtr); err != nil {
+		return err
+	}
+	v.blockDeviceIdentifier = identifier
+	return nil
+}
+
 // USBMassStorageDeviceConfiguration is a configuration of a USB Mass Storage storage device.
 //
 // This device configuration creates a storage device that conforms to the USB Mass Storage specification.

storage_test.go

@@ -0,0 +1,64 @@
+package vz_test
+
+import (
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/Code-Hex/vz/v2"
+)
+
+func TestBlockDeviceIdentifier(t *testing.T) {
+	if vz.Available(12.3) {
+		t.Skip("VirtioBlockDeviceConfiguration.SetBlockDeviceIdentifier is supported from macOS 12.3")
+	}
+	dir := t.TempDir()
+	path := filepath.Join(dir, "disk.img")
+	if err := vz.CreateDiskImage(path, 512); err != nil {
+		t.Fatal(err)
+	}
+
+	attachment, err := vz.NewDiskImageStorageDeviceAttachment(path, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	config, err := vz.NewVirtioBlockDeviceConfiguration(attachment)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got1, err := config.BlockDeviceIdentifier()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got1 != "" {
+		t.Fatalf("want empty by default: %q", got1)
+	}
+
+	invalidID := strings.Repeat("h", 25)
+	if err := config.SetBlockDeviceIdentifier(invalidID); err == nil {
+		t.Fatal("want error")
+	} else {
+		nserr, ok := err.(*vz.NSError)
+		if !ok {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if nserr.Domain != "VZErrorDomain" {
+			t.Errorf("unexpected NSError domain: %v", nserr)
+		}
+		if nserr.Code != int(vz.ErrorInvalidVirtualMachineConfiguration) {
+			t.Errorf("unexpected NSError code: %v", nserr)
+		}
+	}
+
+	want := "hello"
+	if err := config.SetBlockDeviceIdentifier(want); err != nil {
+		t.Fatal(err)
+	}
+	got2, err := config.BlockDeviceIdentifier()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got2 != want {
+		t.Fatalf("want %q but got %q", want, got2)
+	}
+}

virtualization_12_3.h

@@ -0,0 +1,16 @@
+//
+//  virtualization_12_3.h
+//
+//  Created by codehex.
+//
+
+#pragma once
+
+#import "virtualization_helper.h"
+#import <Virtualization/Virtualization.h>
+
+// FIXME(codehex): this is dirty hack to avoid clang-format error like below
+// "Configuration file(s) do(es) not support C++: /github.com/Code-Hex/vz/.clang-format"
+#define NSURLComponents NSURLComponents
+
+void setBlockDeviceIdentifierVZVirtioBlockDeviceConfiguration(void *blockDeviceConfig, const char *identifier, void **error);

virtualization_12_3.m

@@ -0,0 +1,24 @@
+//
+//  virtualization_12_3.m
+//
+//  Created by codehex.
+//
+
+#import "virtualization_12_3.h"
+
+void setBlockDeviceIdentifierVZVirtioBlockDeviceConfiguration(void *blockDeviceConfig, const char *identifier, void **error)
+{
+    if (@available(macOS 12.3, *)) {
+        NSString *identifierNSString = [NSString stringWithUTF8String:identifier];
+        BOOL valid = [VZVirtioBlockDeviceConfiguration
+            validateBlockDeviceIdentifier:identifierNSString
+                                    error:(NSError *_Nullable *_Nullable)error];
+        if (!valid) {
+            return;
+        }
+        [(VZVirtioBlockDeviceConfiguration *)blockDeviceConfig setBlockDeviceIdentifier:identifierNSString];
+        return;
+    }
+
+    RAISE_UNSUPPORTED_MACOS_EXCEPTION();
+}