misc/dist: add binary distribution packaging script for linux

R=golang-dev, bradfitz, iant
CC=golang-dev
https://golang.org/cl/5639064

misc/dist/linux/dist.bash

+#!/usr/bin/env bash
+# Copyright 2012 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+set -e
+
+TAG=$1
+if [ "$TAG" == "" ]; then
+	echo >&2 'usage: dist.bash <tag>'
+	exit 2
+fi
+
+GOOS=${GOOS:-linux}
+GOARCH=${GOARCH:-amd64}
+
+ROOT=/tmp/godist.linux.$GOARCH
+rm -rf $ROOT
+mkdir -p $ROOT
+pushd $ROOT>/dev/null
+
+# clone Go distribution
+echo "Preparing new GOROOT"
+hg clone -q https://code.google.com/p/go go
+pushd go > /dev/null
+hg update $TAG
+
+# get version
+pushd src > /dev/null
+echo "Building dist tool to get VERSION"
+./make.bash --dist-tool 2>&1 | sed 's/^/  /' >&2
+../bin/tool/dist version > ../VERSION
+popd > /dev/null
+VERSION="$(cat VERSION | awk '{ print $1 }')"
+echo "  Version: $VERSION"
+
+# remove mercurial stuff
+rm -rf .hg*
+
+# build Go
+echo "Building Go"
+unset GOROOT
+export GOOS
+export GOARCH
+export GOROOT_FINAL=/usr/local/go
+pushd src > /dev/null
+./all.bash 2>&1 | sed 's/^/  /' >&2
+popd > /dev/null
+popd > /dev/null
+
+# tar it up
+DEST=go.$VERSION.$GOOS-$GOARCH.tar.gz
+echo "Writing tarball: $ROOT/$DEST"
+tar czf $DEST go
+popd > /dev/null