[gparted] Add bug checks into label file system operation methods (#774818)

[Curtis Gedak <gedakc src gnome org>]

commit 49c05646019f76a015afaee32335f53cc4d58f1f
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sat Dec 3 20:06:44 2016 +0000

    Add bug checks into label file system operation methods (#774818)
    
    Ensure pre-condition of never being passed a Partition object containing
    an open LUKS encryption mapping is met for label file system operation
    related methods.
    
    Bug 774818 - Implement LUKS read-write actions NOT requiring a
                 passphrase

 src/GParted_Core.cc |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/GParted_Core.cc b/src/GParted_Core.cc
index 7f5af03..cbc8121 100644
--- a/src/GParted_Core.cc
+++ b/src/GParted_Core.cc
@@ -2146,6 +2146,14 @@ bool GParted_Core::remove_filesystem( const Partition & partition, OperationDeta
 
 bool GParted_Core::label_filesystem( const Partition & partition, OperationDetail & operationdetail )
 {
+       if ( partition.filesystem == FS_LUKS && partition.busy )
+       {
+               operationdetail.add_child( OperationDetail(
+                       GPARTED_BUG + ": " + _("partition contains open LUKS encryption for a label file 
system only step"),
+                       STATUS_ERROR, FONT_ITALIC ) );
+               return false;
+       }
+
        if( partition.get_filesystem_label().empty() ) {
                operationdetail.add_child( OperationDetail(
                        String::ucompose( _("Clear file system label on %1"), partition.get_path() ) ) );