Add some guesswork to acquire a part node from a fstab entry for /home.

src/modules/partition/core/OsproberEntry.cpp

@@ -0,0 +1,90 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2016, Teo Mrnjavac <teo@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "OsproberEntry.h"
+
+#include <QProcess>
+
+
+QString
+OsproberEntry::homePartitionPath()
+{
+    if ( fstab.isEmpty() )
+        return QString();
+
+    foreach ( const FstabEntry& entry, fstab )
+    {
+        if ( entry.mountPoint == "/home" )
+        {
+            QProcess readlink;
+            QString partPath;
+
+            if ( entry.partitionNode.startsWith( "/dev" ) ) // plain dev node
+            {
+                partPath = entry.partitionNode;
+            }
+            else if ( entry.partitionNode.startsWith( "LABEL=" ) )
+            {
+                partPath = entry.partitionNode.mid( 6 );
+                partPath.remove( "\"" );
+                partPath.replace( "\\040", "\\ " );
+                partPath.prepend( "/dev/disk/by-label/" );
+            }
+            else if ( entry.partitionNode.startsWith( "UUID=" ) )
+            {
+                partPath = entry.partitionNode.mid( 5 );
+                partPath.remove( "\"" );
+                partPath = partPath.toLower();
+                partPath.prepend( "/dev/disk/by-uuid/" );
+            }
+            else if ( entry.partitionNode.startsWith( "PARTLABEL=" ) )
+            {
+                partPath = entry.partitionNode.mid( 10 );
+                partPath.remove( "\"" );
+                partPath.replace( "\\040", "\\ " );
+                partPath.prepend( "/dev/disk/by-partlabel/" );
+            }
+            else if ( entry.partitionNode.startsWith( "PARTUUID=" ) )
+            {
+                partPath = entry.partitionNode.mid( 9 );
+                partPath.remove( "\"" );
+                partPath = partPath.toLower();
+                partPath.prepend( "/dev/disk/by-partuuid/" );
+            }
+
+            // At this point we either have /dev/sda1, or /dev/disk/by-something/...
+
+            if ( partPath.startsWith( "/dev/disk/by-" ) ) // we got a fancy node
+            {
+                readlink.start( "readlink", { "-en", partPath });
+                if ( !readlink.waitForStarted( 1000 ) )
+                    return QString();
+                if ( !readlink.waitForFinished( 1000 ) )
+                    return QString();
+                if ( readlink.exitCode() != 0 || readlink.exitStatus() != QProcess::NormalExit )
+                    return QString();
+                partPath = QString::fromLocal8Bit(
+                               readlink.readAllStandardOutput() ).trimmed();
+            }
+
+            return partPath;
+        }
+    }
+
+    return QString();
+}

src/modules/partition/core/OsproberEntry.h

@@ -40,6 +40,8 @@ struct OsproberEntry
     bool canBeResized;
     QStringList line;
     FstabEntryList fstab;
+
+    QString homePartitionPath();
 };
 
 typedef QList< OsproberEntry > OsproberEntryList;