Add deactivatable check to deactivate VG operation.

src/ops/deactivatevolumegroupoperation.cpp

@@ -21,6 +21,7 @@
 
 #include "core/volumemanagerdevice.h"
 #include "core/partitiontable.h"
+#include "core/partition.h"
 
 #include <QString>
 
@@ -57,3 +58,17 @@ void DeactivateVolumeGroupOperation::undo()
         delete tmp;
     }
 }
+
+bool DeactivateVolumeGroupOperation::isDeactivatable(const VolumeManagerDevice* dev)
+{
+    if (dev->type() == Device::LVM_Device) {
+        for (const auto &p : dev->partitionTable()->children()) {
+            if (p->isMounted()) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    return false;
+}

src/ops/deactivatevolumegroupoperation.h

@@ -58,6 +58,8 @@ public:
     virtual void preview() override;
     virtual void undo() override;
 
+    static bool isDeactivatable(const VolumeManagerDevice* dev);
+
 protected:
     DeactivateVolumeGroupJob* deactivateVolumeGroupJob() {
         return m_DeactivateVolumeGroupJob;