Add basic grub module. Not enabled for now because it requires a rootfs to work

Fixes #26

src/modules/grub/main.py

+#!/usr/bin/env python3
+# encoding: utf-8
+# === This file is part of Calamares - <http://github.com/calamares> ===
+#
+#   Copyright 2014, Aurélien Gâteau <agateau@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/>.
+
+import os
+import subprocess
+import sys
+
+import libcalamares
+
+
+# FIXME: Duplicated between mount and grub
+def mount( devicePath, mountPoint, fs = None, options = None ):
+    assert devicePath
+    assert mountPoint
+    if not os.path.exists( mountPoint ):
+        os.makedirs( mountPoint )
+    cmd = [ "mount", devicePath, mountPoint ]
+    if fs:
+        cmd += ( "-t", fs )
+    if options:
+        cmd += ( "-o", options )
+    subprocess.check_call( cmd )
+
+
+def mountPartitions( rootMountPoint, partitions ):
+    for partition in partitions:
+        if not partition[ "mountPoint" ]:
+            continue
+        # Create mount point with `+` rather than `os.path.join()` because
+        # `partition["mountPoint"]` starts with a '/'.
+        mountPoint = rootMountPoint + partition[ "mountPoint" ]
+        mount( partition[ "device" ], mountPoint,
+            fs = partition.get( "fs" ),
+            options = partition.get( "options" )
+        )
+
+
+def umountPartitions( rootMountPoint, partitions ):
+    for partition in partitions:
+        if not partition[ "mountPoint" ]:
+            continue
+        subprocess.call( [ "umount", rootMountPoint + partition[ "mountPoint" ] ] )
+
+
+def chroot_call( rootMountPoint, cmd ):
+    subprocess.check_call( [ "chroot", rootMountPoint ] + cmd )
+
+
+def installGrub( rootMountPoint, bootLoader ):
+    installPath = bootLoader[ "installPath" ]
+    chroot_call( rootMountPoint, [ "grub-install", installPath ] )
+    chroot_call( rootMountPoint, [ "grub-mkconfig", "-o", "/boot/grub/grub.cfg" ] )
+
+
+def calamares_main():
+    rootMountPoint = libcalamares.global_storage.value( "rootMountPoint" )
+    bootLoader = libcalamares.global_storage.value( "bootLoader" )
+    extraMounts = libcalamares.job.configuration[ "extraMounts" ]
+    mountPartitions( rootMountPoint, extraMounts )
+    try:
+        installGrub( rootMountPoint, bootLoader )
+    finally:
+        umountPartitions( rootMountPoint, extraMounts )
+    return "All done"

src/modules/grub/module.conf

+type:       "job"
+name:       "grub"
+interface:  "python"
+requires:   []
+script:     "main.py"
+configuration:
+    extraMounts:
+        - device: proc
+          fs: proc
+          mountPoint: /proc
+        - device: sys
+          fs: sysfs
+          mountPoint: /sys
+        - device: /dev
+          mountPoint: /dev
+          options: bind