From eb3b90ec9e2785f9b73a47f0256a750a054084e0 Mon Sep 17 00:00:00 2001
From: Teo Mrnjavac <teo@kde.org>
Date: Wed, 16 Nov 2016 15:20:32 +0100
Subject: [PATCH] Handle cryptsetup luksUUID failure.

---
 src/fs/luks.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/fs/luks.cpp b/src/fs/luks.cpp
index fe74af9..ab15f1a 100644
--- a/src/fs/luks.cpp
+++ b/src/fs/luks.cpp
@@ -512,9 +512,19 @@ QString luks::readUUID(const QString& deviceNode) const
 
 QString luks::readOuterUUID(const QString &deviceNode) const
 {
+    if ( deviceNode.isEmpty() )
+        return QString();
+
     ExternalCommand cmd(QStringLiteral("cryptsetup"),
                         { QStringLiteral("luksUUID"), deviceNode });
     if (cmd.run()) {
+        if ( cmd.exitCode() )
+        {
+            qWarning() << "Cannot get luksUUID for device" << deviceNode
+                       << "\tcryptsetup exit code" << cmd.exitCode()
+                       << "\toutput:" << cmd.output().trimmed();
+            return QString();
+        }
         return cmd.output().trimmed();
     }
     return QStringLiteral("---");