initial bits for gover

This commit is contained in:
Aaron Bieber 2020-04-30 16:50:07 -06:00
commit b1a6f7815c
7 changed files with 1030 additions and 0 deletions

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gover
=====
`gover` lets you easily install and test other versions of Go. Think `gotip`
but for releases!
`gover` also verifies PGP signatures for downloaded release tarballs.
```
qbit@litr /t/hello_go> gover download 1.13.9
Fetching "https://dl.google.com/go/go1.13.9.src.tar.gz"
Fetching "https://dl.google.com/go/go1.13.9.src.tar.gz.asc"
Signature OK.
extracted tarball into /home/qbit/sdk/gover/1.13.9: 8687 files, 1089 dirs (4.804680289s)
Building Go cmd/dist using /usr/local/go.
Building Go toolchain1 using /usr/local/go.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for openbsd/amd64.
---
Installed Go for openbsd/amd64 in /home/qbit/sdk/gover/1.13.9/go
Installed commands in /home/qbit/sdk/gover/1.13.9/go/bin
Success. You may now run 'gover 1.13.9'!
qbit@litr /t/hello_go> gover 1.13.9 build
qbit@litr /t/hello_go> goversion ./hello_go
./hello_go go1.13.9
qbit@litr /t/hello_go> go build
qbit@litr /t/hello_go> goversion ./hello_go
./hello_go go1.14.2
qbit@litr /t/hello_go>
```

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module suah.dev/gover
go 1.14
require (
golang.org/x/build v0.0.0-20200428202702-916311cec4e1
golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527
)

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google.golang.org/api v0.18.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
google.golang.org/api v0.20.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200115191322-ca5a22157cba/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200204135345-fa8e72b47b90/go.mod h1:GmwEX6Z4W5gMy59cAlVYjN9JhxgbQH6Gn+gFDQe2lzA=
google.golang.org/genproto v0.0.0-20200212174721-66ed5ce911ce/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200305110556-506484158171/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

535
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The gover command compiles and runs the go command from a release version.
//
// To install, run:
//
// $ go get suah.dev/gover
// $ gover download 1.14.2
//
// And then use the gover command as if it were your normal go command.
//
// To download a specific version, run "gover download VERSION".
package main
import (
"bytes"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"os/exec"
"os/user"
"path"
"path/filepath"
"runtime"
"strings"
"golang.org/x/crypto/openpgp"
)
// Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>
// RSA key 0x78BD65473CB3BD13
// Primary key fingerprint: EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
// Subkey fingerprint: 2F52 8D36 D67B 69ED F998 D857 78BD 6547 3CB3 BD13
const pubKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
mQINBFcMjNMBEAC6Wr5QuLIFgz1V1EFPlg8ty2TsjQEl4VWftUAqWlMevJFWvYEx
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utxQFH1qq9rh/JVyxJNHeGzV5G0timAwfdJFUzE1vNU5P0w4O8HrCsX5Ecfgcw2B
Q9vPCE3OfG+11xp6oiNMRVsR5pTu7RiI1BQAyICWUW/wXuhhHkkwNTiwfciJfVA8
ckOiRubik8geEH5boOxgeAaBu6yusQVHnRRyG4wjQ+qsWo+wDI9WMdtpNG1toJrS
UL4OYa4oX3YogSv5hGrbYIaP4HwO6O2oTMnS0lRIGJOqbEQcmKUa/nWT/3NipTnY
zyMjMlEQe89YKjd+32tjMfOSdIOvwCGaTizdWnKPF77qB9D0v8C/7AdHmEFqf2ZX
8vK31aaY+ZpPWG5IHlf6f/buIMBalJOxIBeveBqxcHwQ
=kkJT
-----END PGP PUBLIC KEY BLOCK-----
`
func main() {
log.SetFlags(0)
root, err := goroot("gover")
version := ""
if err != nil {
log.Fatalf("gover: %v", err)
}
pledge("stdio tty unveil rpath cpath wpath proc dns inet fattr exec")
unveil("/etc", "r")
unveil(root, "rwxc")
unveilBlock()
if os.Args[1] == "download" {
switch len(os.Args) {
case 3:
version = os.Args[2]
if err := installVer(root, version); err != nil {
log.Fatalf("gover: %v", err)
}
default:
log.Fatalf("gover: usage: gover download [version]")
}
log.Printf("Success. You may now run 'gover %s'!", version)
os.Exit(0)
}
version = os.Args[1]
gobin := filepath.Join(root, version, "go", "bin", "go"+exe())
gorootPath := filepath.Join(root, version, "go")
if _, err := os.Stat(gobin); err != nil {
log.Fatalf("gover: not downloaded. Run 'gover download' to install to %v", root)
}
cmd := exec.Command(gobin, os.Args[2:]...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
newPath := filepath.Join(root, version, "go", "bin")
if p := os.Getenv("PATH"); p != "" {
newPath += string(filepath.ListSeparator) + p
}
cmd.Env = dedupEnv(caseInsensitiveEnv, append(os.Environ(), "GOROOT="+gorootPath, "PATH="+newPath))
if err := cmd.Run(); err != nil {
if _, ok := err.(*exec.ExitError); ok {
// TODO: return the same exit status maybe.
os.Exit(1)
}
log.Fatalf("gover: failed to execute %v: %v", gobin, err)
}
os.Exit(0)
}
func fetch(a, b string) (*os.File, error) {
fmt.Printf("Fetching %q\n", a)
f, err := os.Create(b)
if err != nil {
return nil, err
}
fResp, err := http.Get(a)
if err != nil {
return nil, err
}
defer fResp.Body.Close()
if _, err := io.Copy(f, fResp.Body); err != nil {
return nil, err
}
_, err = f.Seek(0, 0)
if err != nil {
return nil, err
}
return f, nil
}
func fetchify(goURL string, fp string) error {
buf := bytes.NewBufferString(pubKey)
kr, err := openpgp.ReadArmoredKeyRing(buf)
if err != nil {
return err
}
tbz, err := fetch(goURL, fp)
if err != nil {
return err
}
sig, err := fetch(goURL+".asc", fp+".asc")
if err != nil {
return err
}
defer tbz.Close()
defer sig.Close()
_, err = openpgp.CheckArmoredDetachedSignature(kr, tbz, sig)
if err != nil {
return err
}
fmt.Println("Signature OK.")
_, err = tbz.Seek(0, 0)
if err != nil {
return err
}
return Untar(tbz, path.Dir(fp))
}
func installVer(root, version string) error {
goURL := fmt.Sprintf("https://dl.google.com/go/go%s.src.tar.gz", version)
goFP := filepath.Join(root, version, fmt.Sprintf("go%s.src.tar.gz", version))
if _, err := os.Stat(filepath.Join(root, version, "go")); err != nil {
if err := os.MkdirAll(filepath.Join(root, version), 0755); err != nil {
return fmt.Errorf("failed to create source directory: %v", err)
}
err := fetchify(goURL, goFP)
if err != nil {
return fmt.Errorf("failed to verify: %v", err)
}
}
cmd := exec.Command(filepath.Join(root, version, "go", "src", makeScript()))
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = filepath.Join(root, version, "go", "src")
if runtime.GOOS == "windows" {
// Workaround make.bat not autodetecting GOROOT_BOOTSTRAP. Issue 28641.
goroot, err := exec.Command("go", "env", "GOROOT").Output()
if err != nil {
return fmt.Errorf("failed to detect an existing go installation for bootstrap: %v", err)
}
cmd.Env = append(os.Environ(), "GOROOT_BOOTSTRAP="+strings.TrimSpace(string(goroot)))
}
if err := cmd.Run(); err != nil {
return fmt.Errorf("failed to build go: %v", err)
}
return nil
}
func makeScript() string {
switch runtime.GOOS {
case "plan9":
return "make.rc"
case "windows":
return "make.bat"
default:
return "make.bash"
}
}
const caseInsensitiveEnv = runtime.GOOS == "windows"
func exe() string {
if runtime.GOOS == "windows" {
return ".exe"
}
return ""
}
func goroot(version string) (string, error) {
home, err := homedir()
if err != nil {
return "", fmt.Errorf("failed to get home directory: %v", err)
}
return filepath.Join(home, "sdk", version), nil
}
func homedir() (string, error) {
// This could be replaced with os.UserHomeDir, but it was introduced too
// recently, and we want this to work with go as packaged by Linux
// distributions. Note that user.Current is not enough as it does not
// prioritize $HOME. See also Issue 26463.
switch runtime.GOOS {
case "plan9":
if dir := os.Getenv("home"); dir != "" {
return dir, nil
}
return "", errors.New("can't find user home directory; %USERPROFILE% is empty")
case "windows":
if dir := os.Getenv("USERPROFILE"); dir != "" {
return dir, nil
}
return "", errors.New("can't find user home directory; %USERPROFILE% is empty")
default:
if dir := os.Getenv("HOME"); dir != "" {
return dir, nil
}
if u, err := user.Current(); err == nil && u.HomeDir != "" {
return u.HomeDir, nil
}
return "", errors.New("can't find user home directory; $HOME is empty")
}
}
// dedupEnv returns a copy of env with any duplicates removed, in favor of
// later values.
// Items are expected to be on the normal environment "key=value" form.
// If caseInsensitive is true, the case of keys is ignored.
//
// This function is unnecessary when the binary is
// built with Go 1.9+, but keep it around for now until Go 1.8
// is no longer seen in the wild in common distros.
//
// This is copied verbatim from golang.org/x/build/envutil.Dedup at CL 10301
// (commit a91ae26).
func dedupEnv(caseInsensitive bool, env []string) []string {
out := make([]string, 0, len(env))
saw := map[string]int{} // to index in the array
for _, kv := range env {
eq := strings.Index(kv, "=")
if eq < 1 {
out = append(out, kv)
continue
}
k := kv[:eq]
if caseInsensitive {
k = strings.ToLower(k)
}
if dupIdx, isDup := saw[k]; isDup {
out[dupIdx] = kv
} else {
saw[k] = len(out)
out = append(out, kv)
}
}
return out
}

7
protect.go Normal file
View File

@ -0,0 +1,7 @@
//+build !openbsd
package main
func pledge(promises string) {}
func unveil(path string, flags string) {}
func unveilBlock() {}

28
protect_openbsd.go Normal file
View File

@ -0,0 +1,28 @@
package main
import (
"log"
"golang.org/x/sys/unix"
)
func pledge(promises string) {
err := unix.PledgePromises(promises)
if err != nil {
log.Fatal(err)
}
}
func unveil(path string, flags string) {
err := unix.Unveil(path, flags)
if err != nil {
log.Fatal(err)
}
}
func unveilBlock() {
err := unix.UnveilBlock()
if err != nil {
log.Fatal(err)
}
}

141
untar.go Normal file
View File

@ -0,0 +1,141 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// this was copied from golang.org/x/build/internal/untar
package main
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"log"
"os"
"path"
"path/filepath"
"strings"
"time"
)
// TODO(bradfitz): this was copied from x/build/cmd/buildlet/buildlet.go
// but there were some buildlet-specific bits in there, so the code is
// forked for now. Unfork and add some opts arguments here, so the
// buildlet can use this code somehow.
// Untar reads the gzip-compressed tar file from r and writes it into dir.
func Untar(r io.Reader, dir string) error {
return untar(r, dir)
}
func untar(r io.Reader, dir string) (err error) {
t0 := time.Now()
nFiles := 0
madeDir := map[string]bool{}
defer func() {
td := time.Since(t0)
if err == nil {
log.Printf("extracted tarball into %s: %d files, %d dirs (%v)", dir, nFiles, len(madeDir), td)
} else {
log.Printf("error extracting tarball into %s after %d files, %d dirs, %v: %v", dir, nFiles, len(madeDir), td, err)
}
}()
zr, err := gzip.NewReader(r)
if err != nil {
return fmt.Errorf("requires gzip-compressed body: %v", err)
}
tr := tar.NewReader(zr)
loggedChtimesError := false
for {
f, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
log.Printf("tar reading error: %v", err)
return fmt.Errorf("tar error: %v", err)
}
if !validRelPath(f.Name) {
return fmt.Errorf("tar contained invalid name error %q", f.Name)
}
rel := filepath.FromSlash(f.Name)
abs := filepath.Join(dir, rel)
fi := f.FileInfo()
mode := fi.Mode()
switch {
case mode.IsRegular():
// Make the directory. This is redundant because it should
// already be made by a directory entry in the tar
// beforehand. Thus, don't check for errors; the next
// write will fail with the same error.
dir := filepath.Dir(abs)
if !madeDir[dir] {
if err := os.MkdirAll(filepath.Dir(abs), 0755); err != nil {
return err
}
madeDir[dir] = true
}
wf, err := os.OpenFile(abs, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode.Perm())
if err != nil {
return err
}
n, err := io.Copy(wf, tr)
if closeErr := wf.Close(); closeErr != nil && err == nil {
err = closeErr
}
if err != nil {
return fmt.Errorf("error writing to %s: %v", abs, err)
}
if n != f.Size {
return fmt.Errorf("only wrote %d bytes to %s; expected %d", n, abs, f.Size)
}
modTime := f.ModTime
if modTime.After(t0) {
// Clamp modtimes at system time. See
// golang.org/issue/19062 when clock on
// buildlet was behind the gitmirror server
// doing the git-archive.
modTime = t0
}
if !modTime.IsZero() {
if err := os.Chtimes(abs, modTime, modTime); err != nil && !loggedChtimesError {
// benign error. Gerrit doesn't even set the
// modtime in these, and we don't end up relying
// on it anywhere (the gomote push command relies
// on digests only), so this is a little pointless
// for now.
log.Printf("error changing modtime: %v (further Chtimes errors suppressed)", err)
loggedChtimesError = true // once is enough
}
}
nFiles++
case mode.IsDir():
if err := os.MkdirAll(abs, 0755); err != nil {
return err
}
madeDir[abs] = true
default:
return fmt.Errorf("tar file entry %s contained unsupported file type %v", f.Name, mode)
}
}
return nil
}
func validRelativeDir(dir string) bool {
if strings.Contains(dir, `\`) || path.IsAbs(dir) {
return false
}
dir = path.Clean(dir)
if strings.HasPrefix(dir, "../") || strings.HasSuffix(dir, "/..") || dir == ".." {
return false
}
return true
}
func validRelPath(p string) bool {
if p == "" || strings.Contains(p, `\`) || strings.HasPrefix(p, "/") || strings.Contains(p, "../") {
return false
}
return true
}