[fsresize] Add new module fsresizer

- Non-functional as yet, WIP
 - Intended for use on SBC images and similar, which need to resize
   the root partition to the size of the SD card they're on.

FIXES #921

src/modules/fsresizer/CMakeLists.txt

@@ -0,0 +1,27 @@
+find_package(ECM ${ECM_VERSION} REQUIRED NO_MODULE)
+
+find_package( KPMcore 3.3 )
+find_package( Qt5 REQUIRED DBus )  # Needed for KPMCore
+find_package( KF5 REQUIRED I18n WidgetsAddons )  # Needed for KPMCore
+
+if ( KPMcore_FOUND )
+    if ( KPMcore_VERSION VERSION_GREATER "3.3.0")
+        add_definitions(-DWITH_KPMCOREGT33) # kpmcore greater than 3.3
+    endif()
+
+    include_directories( ${KPMCORE_INCLUDE_DIR} )
+    include_directories( ${PROJECT_BINARY_DIR}/src/libcalamares )
+
+    calamares_add_plugin( fsresizer
+        TYPE job
+        EXPORT_MACRO PLUGINDLLEXPORT_PRO
+        SOURCES
+            ResizeFSJob.cpp
+        LINK_PRIVATE_LIBRARIES
+            kpmcore
+            calamares
+        SHARED_LIB
+    )
+else()
+    calamares_skip_module( "fsresizer (missing suitable KPMcore)" )
+endif()

src/modules/fsresizer/ResizeFSJob.cpp

@@ -0,0 +1,104 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2018, Adriaan de Groot <groot@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 "ResizeFSJob.h"
+
+#include <QProcess>
+#include <QDateTime>
+#include <QThread>
+
+#include "CalamaresVersion.h"
+#include "JobQueue.h"
+#include "GlobalStorage.h"
+
+#include "utils/Logger.h"
+
+ResizeFSJob::RelativeSize::RelativeSize()
+    : m_unit( None )
+    , m_value( 0 )
+{
+}
+
+
+ResizeFSJob::RelativeSize::RelativeSize( const QString& s)
+    : m_unit( None )
+    , m_value( 0 )
+{
+    QString valuePart;
+
+    if ( s.endsWith( '%' ) )
+    {
+        valuePart = s.left( s.length() - 1 );
+        m_unit = Percent;
+    }
+    if ( s.endsWith( "MiB" ) )
+    {
+        valuePart = s.left( s.length() - 3 );
+        m_unit = Absolute;
+    }
+
+    if ( ( m_unit != None ) && !valuePart.isEmpty() )
+        m_value = valuePart.toInt();
+
+    if ( !m_value )
+        m_unit = None;
+}
+
+
+ResizeFSJob::ResizeFSJob( QObject* parent )
+    : Calamares::CppJob( parent )
+{
+}
+
+
+ResizeFSJob::~ResizeFSJob()
+{
+}
+
+
+QString
+ResizeFSJob::prettyName() const
+{
+    return tr( "Resize Filesystem Job" );
+}
+
+
+Calamares::JobResult
+ResizeFSJob::exec()
+{
+    return Calamares::JobResult::ok();
+}
+
+
+void
+ResizeFSJob::setConfigurationMap( const QVariantMap& configurationMap )
+{
+    m_fsname = configurationMap["fs"].toString();
+    m_devicename = configurationMap["dev"].toString();
+
+    if ( m_fsname.isEmpty() && m_devicename.isEmpty() )
+    {
+        cWarning() << "No fs or dev configured for resize.";
+        return;
+    }
+
+    m_size = RelativeSize( configurationMap["size"].toString() );
+    m_atleast = RelativeSize( configurationMap["atleast"].toString() );
+}
+
+CALAMARES_PLUGIN_FACTORY_DEFINITION( ResizeFSJobFactory, registerPlugin<ResizeFSJob>(); )

src/modules/fsresizer/ResizeFSJob.h

@@ -0,0 +1,75 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2018, Adriaan de Groot <groot@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/>.
+ */
+
+#ifndef RESIZEFSJOB_H
+#define RESIZEFSJOB_H
+
+#include <QObject>
+#include <QVariantMap>
+
+#include <CppJob.h>
+
+#include <utils/PluginFactory.h>
+
+#include <PluginDllMacro.h>
+
+class PLUGINDLLEXPORT ResizeFSJob : public Calamares::CppJob
+{
+    Q_OBJECT
+
+    class RelativeSize
+    {
+    public:
+        RelativeSize();
+        RelativeSize( const QString& );
+
+        enum Unit
+        {
+            None,
+            Percent,
+            Absolute
+        };
+
+        quint64 value() const { return m_value; }
+        Unit unit() const { return m_unit; }
+
+    private:
+        quint64 m_value;
+        Unit m_unit;
+    } ;
+
+public:
+    explicit ResizeFSJob( QObject* parent = nullptr );
+    virtual ~ResizeFSJob() override;
+
+    QString prettyName() const override;
+
+    Calamares::JobResult exec() override;
+
+    void setConfigurationMap( const QVariantMap& configurationMap ) override;
+
+private:
+    RelativeSize m_size;
+    RelativeSize m_atleast;
+    QString m_fsname;  // Either this, or devicename, is set, not both
+    QString m_devicename;
+};
+
+CALAMARES_PLUGIN_FACTORY_DECLARATION( ResizeFSJobFactory )
+
+#endif // RESIZEFSJOB_H

src/modules/fsresizer/fsresizer.conf

@@ -0,0 +1,30 @@
+# Module that resizes a single FS to fill the entire (rest) of
+# a device. This is used in OEM situations where an image is
+# flashed onto an SD card (or similar) and used to boot a device,
+# after which the FS should expand to fill the SD card.
+#
+# Example: a distro produces a 6GiB large image that is
+# written to an 8GiB SD card; the FS should expand to take
+# advantage of the unused 2GiB. The FS should expand much
+# more if the same image is written to a 16GiB card.
+--
+
+# Which FS needs to be grown? Choose one way to identify it:
+#  - *fs* names a mount point which should already be mounted
+#    in the system.
+#  - *dev* names a device 
+fs: /
+# dev: /dev/mmcblk0p1
+
+# How much of the total remaining space should the FS use?
+# The only sensible amount is "all of it". The value is
+# in percent, so set it to 100. Perhaps a fixed size is
+# needed (that would be weird though, since you don't know
+# how big the card is), use MiB as suffix in that case.
+size: 100%
+
+# Resizing might not be worth it, though. Set the minimum
+# that it must grow; if it cannot grow that much, the
+# resizing is skipped. Can be in percentage or absolute
+# size, as above.
+atleast: 1000MiB