536 lines
24 KiB
Go
536 lines
24 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The gover command compiles and runs the go command from a release version.
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//
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// To install, run:
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//
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// $ go get suah.dev/gover
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// $ gover download 1.14.2
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//
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// And then use the gover command as if it were your normal go command.
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//
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// To download a specific version, run "gover download VERSION".
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package main
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"os/exec"
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"os/user"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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"golang.org/x/crypto/openpgp"
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)
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// Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>
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// RSA key 0x78BD65473CB3BD13
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// Primary key fingerprint: EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
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// Subkey fingerprint: 2F52 8D36 D67B 69ED F998 D857 78BD 6547 3CB3 BD13
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const pubKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
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|
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
|
|
}
|