[gparted] Stop trying to access device '/dev/mapper/No RAID disks' (#786031)

[Curtis Gedak <gedakc src gnome org>]

commit fc5cc1d3b460110d0709eb9bba00369ab779ec45
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Fri Mar 29 11:07:29 2019 +0000

    Stop trying to access device '/dev/mapper/No RAID disks' (#786031)
    
    Running GParted on AltLinux with dmraid installed but with no configured
    RAID arrays produces this error:
        # gparted
        ...
        Could not stat device /dev/mapper/No RAID disks - No such file or directory.
    
    Most distributions use dmraid 1.0.0.rc16 which reports no raid disks
    like this:
        # dmraid -sa -c
        no raid disks
        # echo $?
        1
    
    However AltLinux had the slightly older version, dmraid 1.0.0.rc14,
    which reported no raid disks like this:
        # dmraid -sa -c
        No RAID disks
        # echo $?
        0
    
    So because dmraid 1.0.0.rc14 reported success, exit status 0, and the
    "No RAID disks" message was not in lower case, that text was considered
    a disk device in a DMRaid array.  Fix by checking for "no raid disks" in
    any case.
    
    Bug 786031 - Could not stat device /dev/mapper/No RAID disks - No such
                 file or directory

 src/DMRaid.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/DMRaid.cc b/src/DMRaid.cc
index c003ab17..47e75a92 100644
--- a/src/DMRaid.cc
+++ b/src/DMRaid.cc
@@ -22,6 +22,7 @@
 #include <glibmm/miscutils.h>
 #include <glibmm/fileutils.h>
 #include <glibmm/shell.h>
+#include <glibmm/ustring.h>
 
 
 namespace GParted
@@ -75,8 +76,7 @@ void DMRaid::load_dmraid_cache()
        {
                if ( ! Utils::execute_command( "dmraid -sa -c", output, error, true ) )
                {
-                       Glib::ustring temp = Utils::regexp_label( output, "^(no raid disks).*" ) ;
-                       if ( temp != "no raid disks" )
+                       if (output.substr(0, 13).lowercase() != "no raid disks")
                                Utils::tokenize( output, dmraid_devices, "\n" ) ;
                }
        }