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main.go
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main.go
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// 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.
// Goversion scans a directory tree and, for every executable it finds,
// prints the Go version used to build that executable.
//
// Usage:
//
// goversion [-crypto] [-m | -mh] [-v] path...
//
// The list of paths can be individual files or directories; if the latter,
// goversion scans all files in the directory tree, not following symlinks.
//
// Goversion scans inside of tar or gzipped tar archives that it finds
// (named *.tar, *.tar.gz, or *.tgz), but not recursively.
//
// The -crypto flag causes goversion to print additional information
// about the crypto libraries linked into each executable.
//
// The -m flag causes goversion to print the list of modules
// found in the executable, along with version information.
//
// The -mh flag causes goversion to print the list of modules
// found in the executable, along with version and hash information.
//
// The -v flag causes goversion to print information about every
// file it considers.
//
// # Example
//
// Scan /usr/bin for Go binaries and print their versions:
//
// $ goversion /usr/bin
// /usr/bin/containerd go1.7.4
// /usr/bin/containerd-shim go1.7.4
// /usr/bin/ctr go1.7.4
// /usr/bin/docker go1.7.4
// /usr/bin/docker-proxy go1.7.4
// /usr/bin/dockerd go1.7.4
// /usr/bin/kbfsfuse go1.8.3
// /usr/bin/kbnm go1.8.3
// /usr/bin/keybase go1.8.3
// /usr/bin/snap go1.7.4
// /usr/bin/snapctl go1.7.4
package main // import "rsc.io/goversion"
import (
"archive/tar"
"bufio"
"compress/gzip"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"runtime"
"strings"
"unicode/utf8"
"rsc.io/goversion/version"
)
var (
crypto = flag.Bool("crypto", false, "check kind of crypto library")
modinfo = flag.Bool("m", false, "show module info")
modhash = flag.Bool("mh", false, "show module and hash info")
verbose = flag.Bool("v", false, "print verbose information")
)
func init() {
flag.BoolVar(&version.DebugMatch, "d", version.DebugMatch, "print debug information")
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: goversion [-crypto] [-v] path...\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
log.SetFlags(0)
log.SetPrefix("goversion: ")
flag.Usage = usage
flag.Parse()
if flag.NArg() == 0 {
usage()
}
for _, file := range flag.Args() {
info, err := os.Stat(file)
if err != nil {
log.Print(err)
continue
}
if info.IsDir() {
scandir(file)
} else {
scanfile(file, file, info, true)
}
}
}
func scandir(dir string) {
filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if info.Mode().IsRegular() || info.Mode()&os.ModeSymlink != 0 {
scanfile(path, path, info, *verbose)
}
return nil
})
}
func isExe(file string, info os.FileInfo) bool {
if runtime.GOOS == "windows" {
return strings.HasSuffix(strings.ToLower(file), ".exe")
}
return info.Mode()&0111 != 0
}
func scanfile(file, diskFile string, info os.FileInfo, mustPrint bool) {
if strings.HasSuffix(file, ".tar") {
if file != diskFile {
fmt.Fprintf(os.Stderr, "%s: not scanning tar recursively\n", file)
return
}
if mustPrint {
fmt.Fprintf(os.Stderr, "%s: scanning tar archive\n", file)
}
scantar(file, info)
return
}
if strings.HasSuffix(file, ".tar.gz") || strings.HasSuffix(file, ".tgz") {
if file != diskFile {
fmt.Fprintf(os.Stderr, "%s: not scanning tgz recursively\n", file)
return
}
if mustPrint {
fmt.Fprintf(os.Stderr, "%s: scanning tgz archive\n", file)
}
scantar(file, info)
return
}
if info.Mode()&os.ModeSymlink != 0 {
// Accept file symlinks, but not dir symlinks, to avoid cycles.
i, err := os.Stat(diskFile)
if err != nil || !i.Mode().IsRegular() {
if mustPrint {
fmt.Fprintf(os.Stderr, "%s: symlink\n", file)
}
return
}
info = i
}
if file == diskFile && !isExe(file, info) {
if mustPrint {
fmt.Fprintf(os.Stderr, "%s: not executable\n", file)
}
return
}
v, err := version.ReadExe(diskFile)
if err != nil {
if mustPrint {
fmt.Fprintf(os.Stderr, "%s: %v\n", file, err)
}
return
}
buildVersion := v.Release
if *crypto {
switch {
case v.BoringCrypto && v.StandardCrypto:
buildVersion += " (boring AND standard crypto!!!)"
case v.BoringCrypto:
buildVersion += " (boring crypto)"
case v.StandardCrypto:
buildVersion += " (standard crypto)"
}
if v.FIPSOnly {
buildVersion += " +crypto/tls/fipsonly"
}
}
fmt.Printf("%s %s\n", file, buildVersion)
if (*modinfo || *modhash) && v.ModuleInfo != "" {
var rows [][]string
for _, line := range strings.Split(strings.TrimSpace(v.ModuleInfo), "\n") {
row := strings.Split(line, "\t")
if !*modhash && len(row) > 3 {
row = row[:3]
}
rows = append(rows, row)
}
printTable(os.Stdout, "\t", rows)
}
}
type Version struct {
Release string
BoringCrypto bool
StandardCrypto bool
}
func scantar(file string, info os.FileInfo) {
f, err := os.Open(file)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", file, err)
return
}
defer f.Close()
var r io.Reader = f
if strings.HasSuffix(file, "z") {
z, err := gzip.NewReader(r)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", file, err)
return
}
defer z.Close()
r = z
}
tr := tar.NewReader(r)
for {
hdr, err := tr.Next()
if err != nil {
break
}
if hdr.Typeflag != tar.TypeReg {
if *verbose {
fmt.Fprintf(os.Stderr, "%s/%s: not regular file\n", file, hdr.Name)
}
continue
}
if hdr.Mode&0111 == 0 {
if *verbose {
fmt.Fprintf(os.Stderr, "%s/%s: not executable\n", file, hdr.Name)
}
continue
}
// executable but not special
tmp, err := ioutil.TempFile("", "goversion-")
if err != nil {
log.Fatal(err)
}
io.Copy(tmp, tr)
tmpName := tmp.Name()
info, err := tmp.Stat()
if err != nil {
log.Fatal(err)
}
tmp.Close()
scanfile(file+"/"+hdr.Name, tmpName, info, *verbose)
os.Remove(tmpName)
}
}
func printTable(w io.Writer, prefix string, rows [][]string) {
var max []int
for _, row := range rows {
for i, c := range row {
n := utf8.RuneCountInString(c)
if i >= len(max) {
max = append(max, n)
} else if max[i] < n {
max[i] = n
}
}
}
b := bufio.NewWriter(w)
for _, row := range rows {
b.WriteString(prefix)
for len(row) > 0 && row[len(row)-1] == "" {
row = row[:len(row)-1]
}
for i, c := range row {
b.WriteString(c)
if i+1 < len(row) {
for j := utf8.RuneCountInString(c); j < max[i]+2; j++ {
b.WriteRune(' ')
}
}
}
b.WriteRune('\n')
}
b.Flush()
}