add helper to backup .config

Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>

linux/copy_kernel_config.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+# 
+# 2008      Nico Schottelius (nico-nsbin at schottelius.org)
+# 
+# This file is part of nsbin.
+#
+# nsbin 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.
+# 
+# nsbin 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 nsbin. If not, see <http://www.gnu.org/licenses/>.
+#
+#
+#
+
+################################################################################
+# standard vars
+# Stolen from cconf
+__pwd="$(pwd -P)"
+__mydir="${0%/*}"; __abs_mydir="$(cd "$__mydir" && pwd -P)"
+__myname=${0##*/}; __abs_myname="$__abs_mydir/$__myname"
+
+usage()
+{
+   echo "Usage: ${__myname} <destination directory> [optional prefix]"
+   echo "Must be run in linux tree cloned with git."
+   exit 1
+}
+
+if [ $# -lt 1 ]; then
+   usage
+fi
+
+dir="$1"; shift
+prefix="$1"
+version=$(git describe)
+source=".config"
+
+if [ ! -d "$dir" -o -z "$version" -o ! -f "$source" ]; then
+   usage
+fi
+
+cp -v "$source" "$dir/${prefix}${version}"