1#!/usr/bin/env bash
2# Copyright 2015 The Go Authors. All rights reserved.
3# Use of this source code is governed by a BSD-style
4# license that can be found in the LICENSE file.
5
6# When run as (for example)
7#
8#	GOOS=linux GOARCH=ppc64 bootstrap.bash
9#
10# this script cross-compiles a toolchain for that GOOS/GOARCH
11# combination, leaving the resulting tree in ../../go-${GOOS}-${GOARCH}-bootstrap.
12# That tree can be copied to a machine of the given target type
13# and used as $GOROOT_BOOTSTRAP to bootstrap a local build.
14#
15# Only changes that have been committed to Git (at least locally,
16# not necessary reviewed and submitted to master) are included in the tree.
17#
18# See also golang.org/x/build/cmd/genbootstrap, which is used
19# to generate bootstrap tgz files for builders.
20
21set -e
22
23if [ "$GOOS" = "" -o "$GOARCH" = "" ]; then
24	echo "usage: GOOS=os GOARCH=arch ./bootstrap.bash [-force]" >&2
25	exit 2
26fi
27
28forceflag=""
29if [ "$1" = "-force" ]; then
30	forceflag=-force
31	shift
32fi
33
34targ="../../go-${GOOS}-${GOARCH}-bootstrap"
35if [ -e $targ ]; then
36	echo "$targ already exists; remove before continuing"
37	exit 2
38fi
39
40unset GOROOT
41src=$(cd .. && pwd)
42echo "#### Copying to $targ"
43cp -Rp "$src" "$targ"
44cd "$targ"
45echo
46echo "#### Cleaning $targ"
47chmod -R +w .
48rm -f .gitignore
49if [ -e .git ]; then
50	git clean -f -d
51fi
52echo
53echo "#### Building $targ"
54echo
55cd src
56./make.bash --no-banner $forceflag
57gohostos="$(../bin/go env GOHOSTOS)"
58gohostarch="$(../bin/go env GOHOSTARCH)"
59goos="$(../bin/go env GOOS)"
60goarch="$(../bin/go env GOARCH)"
61
62# NOTE: Cannot invoke go command after this point.
63# We're about to delete all but the cross-compiled binaries.
64cd ..
65if [ "$goos" = "$gohostos" -a "$goarch" = "$gohostarch" ]; then
66	# cross-compile for local system. nothing to copy.
67	# useful if you've bootstrapped yourself but want to
68	# prepare a clean toolchain for others.
69	true
70else
71	rm -f bin/go_${goos}_${goarch}_exec
72	mv bin/*_*/* bin
73	rmdir bin/*_*
74	rm -rf "pkg/${gohostos}_${gohostarch}" "pkg/tool/${gohostos}_${gohostarch}"
75fi
76
77rm -rf pkg/bootstrap pkg/obj .git
78
79echo ----
80echo Bootstrap toolchain for "$GOOS/$GOARCH" installed in "$(pwd)".
81echo Building tbz.
82cd ..
83tar cf - "go-${GOOS}-${GOARCH}-bootstrap" | bzip2 -9 >"go-${GOOS}-${GOARCH}-bootstrap.tbz"
84ls -l "$(pwd)/go-${GOOS}-${GOARCH}-bootstrap.tbz"
85exit 0
86