add a simple script for symlinking one tree into another for doing builds with separate build dirs, but the same source dir

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18734 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/symlink-tree.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+# Create a new openwrt tree with symlinks pointing at the current tree
+# Usage: ./scripts/symlink-tree.sh <destination>
+
+FILES="
+	BSDmakefile
+	Config.in
+	LICENSE
+	Makefile
+	README
+	dl
+	docs
+	feeds.conf.default
+	include
+	package
+	rules.mk
+	scripts
+	target
+	toolchain
+	tools"
+
+if [ -f feeds.conf ] ; then
+	FILES="$FILES feeds.conf"
+fi
+
+if [ -z "$1" ]; then
+	echo "Syntax: $0 <destination>"
+	exit 1
+fi
+
+if [ -e "$1" ]; then
+	echo "Error: $1 already exists"
+	exit 1
+fi
+
+set -e # fail if any commands fails
+mkdir -p dl "$1"
+for file in $FILES; do
+	[ -e "$PWD/$file" ] || {
+		echo "ERROR: $file does not exist in the current tree"
+		exit 1
+	}
+	ln -s "$PWD/$file" "$1/"
+done
+exit 0