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Text file src/bootstrap.bash

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

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