shithub: 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) <[email protected]>

+// 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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++kvSQ/boKjVHNGmf6+JBexd+HqPhkeextV6Jcnmi47HDvIU/TSynhuqZeK/3SZAV

+7ESqQl42q7wm7Pqw0dkv4jjFCRxDA+Qq2aH6szJ7DZxTRWqfR3Zbe78NyFVXKxhF

+QO72zHzC3pFu/Ak59hmTU23yoXVo5t+5O+Q21kX2dbuLd6Px1bnT+EmyneoPP1Em

+ea5jgsw2/ECqHnvNt6cbp+42XYldGh+PBHBmucC3Mn7sALajHe5k2XkNlfbjSNlm

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+ckOiRubik8geEH5boOxgeAaBu6yusQVHnRRyG4wjQ+qsWo+wDI9WMdtpNG1toJrS

+UL4OYa4oX3YogSv5hGrbYIaP4HwO6O2oTMnS0lRIGJOqbEQcmKUa/nWT/3NipTnY

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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

+}

--- /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

+}