Text file src/bootstrap.bash

Documentation: Index

     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 $GOROOT_BOOTSTRAP to bootstrap a local build.
    14#
    15# Only changes that have been committed to Git (at least locally,
    16# not necessary reviewed and submitted to master) are included in the tree.
    17#
    18# As a special case for Go's internal use only, if the
    19# BOOTSTRAP_FORMAT environment variable is set to "mintgz", the
    20# resulting archive is intended for use by the Go build system and
    21# differs in that the mintgz file:
    22#   * is a tar.gz file instead of bz2
    23#   * has many unnecessary files deleted to reduce its size
    24#   * does not have a shared directory component for each tar entry
    25# Do not depend on the mintgz format.
    26
    27set -e
    28
    29if [ "$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

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