[cherry-pick][main]Make Windows build skip BlockMode code.

changelogs/unreleased/6989-blackpiglet

@@ -0,0 +1 @@
+Add both non-Windows version and Windows version code for PVC block mode logic.

pkg/uploader/kopia/block_backup.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright The Velero Contributors.
 

pkg/uploader/kopia/block_backup_windows.go

@@ -0,0 +1,30 @@
+//go:build windows
+// +build windows
+
+/*
+Copyright The Velero Contributors.
+
+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 kopia
+
+import (
+	"fmt"
+
+	"github.com/kopia/kopia/fs"
+)
+
+func getLocalBlockEntry(sourcePath string) (fs.Entry, error) {
+	return nil, fmt.Errorf("block mode is not supported for Windows")
+}

pkg/uploader/kopia/block_restore.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright The Velero Contributors.
 

pkg/uploader/kopia/block_restore_windows.go

@@ -0,0 +1,42 @@
+//go:build windows
+// +build windows
+
+/*
+Copyright The Velero Contributors.
+
+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 kopia
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/kopia/kopia/fs"
+	"github.com/kopia/kopia/snapshot/restore"
+)
+
+type BlockOutput struct {
+	*restore.FilesystemOutput
+
+	targetFileName string
+}
+
+func (o *BlockOutput) WriteFile(ctx context.Context, relativePath string, remoteFile fs.File) error {
+	return fmt.Errorf("block mode is not supported for Windows")
+}
+
+func (o *BlockOutput) BeginDirectory(ctx context.Context, relativePath string, e fs.Directory) error {
+	return fmt.Errorf("block mode is not supported for Windows")
+}