ref: b1a6f7815ce3a1957a2d2374eeb085f158f576e5
author: Aaron Bieber <aaron@bolddaemon.com>
date: Thu Apr 30 12:50:07 EDT 2020
initial bits for gover
--- /dev/null
+++ b/README.md
@@ -1,0 +1,32 @@
+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>
+```
--- /dev/null
+++ b/go.mod
@@ -1,0 +1,9 @@
+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
+)
--- /dev/null
+++ b/go.sum
@@ -1,0 +1,278 @@
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--- /dev/null
+++ b/main.go
@@ -1,0 +1,535 @@
+// 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-----
+
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+=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
+}
--- /dev/null
+++ b/protect.go
@@ -1,0 +1,7 @@
+//+build !openbsd
+
+package main
+
+func pledge(promises string) {}
+func unveil(path string, flags string) {}
+func unveilBlock() {}
--- /dev/null
+++ b/protect_openbsd.go
@@ -1,0 +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)
+ }
+}
--- /dev/null
+++ b/untar.go
@@ -1,0 +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
+}