1#!/usr/local/bin/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 $GOROOT_BOOTSTRAP to bootstrap a local build. 14# 15# Only changes that have been committed to Git (at least locally, 16# not necessary reviewed and submitted to master) are included in the tree. 17# 18# As a special case for Go's internal use only, if the 19# BOOTSTRAP_FORMAT environment variable is set to "mintgz", the 20# resulting archive is intended for use by the Go build system and 21# differs in that the mintgz file: 22# * is a tar.gz file instead of bz2 23# * has many unnecessary files deleted to reduce its size 24# * does not have a shared directory component for each tar entry 25# Do not depend on the mintgz format. 26 27set -e 28 29if [ "$GOOS" = "" -o "$GOARCH" = "" ]; then 30 echo "usage: GOOS=os GOARCH=arch ./bootstrap.bash" >&2 31 exit 2 32fi 33 34targ="../../go-${GOOS}-${GOARCH}-bootstrap" 35if [ -e $targ ]; then 36 echo "$targ already exists; remove before continuing" 37 exit 2 38fi 39 40if [ "$BOOTSTRAP_FORMAT" != "mintgz" -a "$BOOTSTRAP_FORMAT" != "" ]; then 41 echo "unknown BOOTSTRAP_FORMAT format" 42 exit 2 43fi 44 45unset GOROOT 46src=$(cd .. && pwd) 47echo "#### Copying to $targ" 48cp -Rp "$src" "$targ" 49cd "$targ" 50echo 51echo "#### Cleaning $targ" 52chmod -R +w . 53rm -f .gitignore 54if [ -e .git ]; then 55 git clean -f -d 56fi 57echo 58echo "#### Building $targ" 59echo 60cd src 61./make.bash --no-banner 62gohostos="$(../bin/go env GOHOSTOS)" 63gohostarch="$(../bin/go env GOHOSTARCH)" 64goos="$(../bin/go env GOOS)" 65goarch="$(../bin/go env GOARCH)" 66 67# NOTE: Cannot invoke go command after this point. 68# We're about to delete all but the cross-compiled binaries. 69cd .. 70if [ "$goos" = "$gohostos" -a "$goarch" = "$gohostarch" ]; then 71 # cross-compile for local system. nothing to copy. 72 # useful if you've bootstrapped yourself but want to 73 # prepare a clean toolchain for others. 74 true 75else 76 rm -f bin/go_${goos}_${goarch}_exec 77 mv bin/*_*/* bin 78 rmdir bin/*_* 79 rm -rf "pkg/${gohostos}_${gohostarch}" "pkg/tool/${gohostos}_${gohostarch}" 80fi 81 82if [ "$BOOTSTRAP_FORMAT" = "mintgz" ]; then 83 # Fetch git revision before rm -rf .git. 84 GITREV=$(git rev-parse --short HEAD) 85fi 86 87rm -rf pkg/bootstrap pkg/obj .git 88 89# Support for building minimal tar.gz for the builders. 90# The build system doesn't support bzip2, and by deleting more stuff, 91# they start faster, especially on machines without fast filesystems 92# and things like tmpfs configures. 93# Do not depend on this format. It's for internal use only. 94if [ "$BOOTSTRAP_FORMAT" = "mintgz" ]; then 95 OUTGZ="gobootstrap-${GOOS}-${GOARCH}-${GITREV}.tar.gz" 96 echo "Preparing to generate build system's ${OUTGZ}; cleaning ..." 97 rm -rf bin/gofmt 98 rm -rf src/runtime/race/race_*.syso 99 rm -rf api test doc misc/cgo/test misc/trace 100 rm -rf pkg/tool/*_*/{addr2line,api,cgo,cover,doc,fix,nm,objdump,pack,pprof,test2json,trace,vet} 101 rm -rf pkg/*_*/{image,database,cmd} 102 rm -rf $(find . -type d -name testdata) 103 find . -type f -name '*_test.go' -exec rm {} \; 104 # git clean doesn't clean symlinks apparently, and the buildlet 105 # rejects them, so: 106 find . -type l -exec rm {} \; 107 108 echo "Writing ${OUTGZ} ..." 109 tar cf - . | gzip -9 > ../$OUTGZ 110 cd .. 111 ls -l "$(pwd)/$OUTGZ" 112 exit 0 113fi 114 115echo ---- 116echo Bootstrap toolchain for "$GOOS/$GOARCH" installed in "$(pwd)". 117echo Building tbz. 118cd .. 119tar cf - "go-${GOOS}-${GOARCH}-bootstrap" | bzip2 -9 >"go-${GOOS}-${GOARCH}-bootstrap.tbz" 120ls -l "$(pwd)/go-${GOOS}-${GOARCH}-bootstrap.tbz" 121exit 0 122