#!/bin/bash# Copyright 2015 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. # When run as (for example)##	GOOS=linux GOARCH=ppc64 bootstrap.bash## this script cross-compiles a toolchain for that GOOS/GOARCH# combination, leaving the resulting tree in ../../go-${GOOS}-${GOARCH}-bootstrap.# That tree can be copied to a machine of the given target type# and used as $GOROOT_BOOTSTRAP to bootstrap a local build.## Only changes that have been committed to Git (at least locally,# not necessary reviewed and submitted to master) are included in the tree. set -e if [ "$GOOS" = "" -o "$GOARCH" = "" ]; then	echo "usage: GOOS=os GOARCH=arch ./bootstrap.bash" >&2	exit 2fi targ="../../go-${GOOS}-${GOARCH}-bootstrap"if [ -e $targ ]; then	echo "$targ already exists; remove before continuing"	exit 2fi unset GOROOTsrc=$(cd .. && pwd)echo "#### Copying to $targ"cp -R "$src" "$targ"cd "$targ"echoecho "#### Cleaning $targ"rm -f .gitignoreif [ -e .git ]; then	git clean -f -dfiechoecho "#### Building $targ"echocd src./make.bash --no-bannergohostos="$(../bin/go env GOHOSTOS)"gohostarch="$(../bin/go env GOHOSTARCH)"goos="$(../bin/go env GOOS)"goarch="$(../bin/go env GOARCH)" # NOTE: Cannot invoke go command after this point.# We're about to delete all but the cross-compiled binaries.cd ..if [ "$goos" = "$gohostos" -a "$goarch" = "$gohostarch" ]; then	# cross-compile for local system. nothing to copy.	# useful if you've bootstrapped yourself but want to	# prepare a clean toolchain for others.	trueelse	mv bin/*_*/* bin	rmdir bin/*_*	rm -rf "pkg/${gohostos}_${gohostarch}" "pkg/tool/${gohostos}_${gohostarch}"firm -rf pkg/bootstrap pkg/obj .git echo ----echo Bootstrap toolchain for "$GOOS/$GOARCH" installed in "$(pwd)".echo Building tbz.cd ..tar cf - "go-${GOOS}-${GOARCH}-bootstrap" | bzip2 -9 >"go-${GOOS}-${GOARCH}-bootstrap.tbz"ls -l "$(pwd)/go-${GOOS}-${GOARCH}-bootstrap.tbz"exit 0