Text file src/pkg/bootstrap.bash
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 $targ"
48 cp -Rp "$src" "$targ"
49 cd "$targ"
50 echo
51 echo "#### Cleaning $targ"
52 chmod -R +w .
53 rm -f .gitignore
54 if [ -e .git ]; then
55 git clean -f -d
56 fi
57 echo
58 echo "#### Building $targ"
59 echo
60 cd src
61 ./make.bash --no-banner
62 gohostos="$(../bin/go env GOHOSTOS)"
63 gohostarch="$(../bin/go env GOHOSTARCH)"
64 goos="$(../bin/go env GOOS)"
65 goarch="$(../bin/go env GOARCH)"
66
67 # NOTE: Cannot invoke go command after this point.
68 # We're about to delete all but the cross-compiled binaries.
69 cd ..
70 if [ "$goos" = "$gohostos" -a "$goarch" = "$gohostarch" ]; then
71 # cross-compile for local system. nothing to copy.
72 # useful if you've bootstrapped yourself but want to
73 # prepare a clean toolchain for others.
74 true
75 else
76 rm -f bin/go_${goos}_${goarch}_exec
77 mv bin/*_*/* bin
78 rmdir bin/*_*
79 rm -rf "pkg/${gohostos}_${gohostarch}" "pkg/tool/${gohostos}_${gohostarch}"
80 fi
81
82 if [ "$BOOTSTRAP_FORMAT" = "mintgz" ]; then
83 # Fetch git revision before rm -rf .git.
84 GITREV=$(git rev-parse --short HEAD)
85 fi
86
87 rm -rf pkg/bootstrap pkg/obj .git
88
89 # Support for building minimal tar.gz for the builders.
90 # The build system doesn't support bzip2, and by deleting more stuff,
91 # they start faster, especially on machines without fast filesystems
92 # and things like tmpfs configures.
93 # Do not depend on this format. It's for internal use only.
94 if [ "$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
113 fi
114
115 echo ----
116 echo Bootstrap toolchain for "$GOOS/$GOARCH" installed in "$(pwd)".
117 echo Building tbz.
118 cd ..
119 tar cf - "go-${GOOS}-${GOARCH}-bootstrap" | bzip2 -9 >"go-${GOOS}-${GOARCH}-bootstrap.tbz"
120 ls -l "$(pwd)/go-${GOOS}-${GOARCH}-bootstrap.tbz"
121 exit 0
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