Merge pull request #1286 from ProBackup-nl/patch-1

Use /etc/hostname also in the recovery system
if that file is used in the original system (e.g. in Arch Linux)
otherwise use /etc/HOSTNAME (e.g. used on RHEL and SLES)
to fix #1258

usr/share/rear/rescue/default/100_hostname.sh

@@ -5,4 +5,11 @@
 # This file is part of Relax-and-Recover, licensed under the GNU General
 # Public License. Refer to the included COPYING for full text of license.
 
-echo $HOSTNAME >$ROOTFS_DIR/etc/HOSTNAME
+# For Arch Linux storing the host name in /etc/hostname (lowercase)
+# will set the host name in the recovery environment without any scripting.
+
+if [[ -e /etc/hostname ]] ; then
+    echo $HOSTNAME >$ROOTFS_DIR/etc/hostname
+else
+    echo $HOSTNAME >$ROOTFS_DIR/etc/HOSTNAME
+fi