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version.go
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version.go
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// Copyright 2011 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.
// Package version implements the ``go version'' command.
package main
import (
"bytes"
"encoding/binary"
"fmt"
"io/fs"
"os"
"path/filepath"
"runtime"
"strings"
)
func main() {
os.Exit(runVersion(os.Args[1:]))
}
func runVersion(args []string) int {
if len(args) == 0 {
fmt.Printf("go version %s %s/%s\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
return 0
}
exitStatus := 0
for _, arg := range args {
info, err := os.Stat(arg)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
exitStatus = 1
continue
}
if info.IsDir() {
scanDir(arg)
} else {
scanFile(arg, info)
}
}
return exitStatus
}
// scanDir scans a directory for executables to run scanFile on.
func scanDir(dir string) {
filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
if d.Type().IsRegular() || d.Type()&fs.ModeSymlink != 0 {
info, err := d.Info()
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
return nil
}
scanFile(path, info)
}
return nil
})
}
// isExe reports whether the file should be considered executable.
func isExe(file string, info fs.FileInfo) bool {
if runtime.GOOS == "windows" {
return strings.HasSuffix(strings.ToLower(file), ".exe")
}
return info.Mode().IsRegular() && info.Mode()&0111 != 0
}
// scanFile scans file to try to report the Go and module versions.
// If mustPrint is true, scanFile will report any error reading file.
// Otherwise (mustPrint is false, because scanFile is being called
// by scanDir) scanFile prints nothing for non-Go executables.
func scanFile(file string, info fs.FileInfo) {
if info.Mode()&fs.ModeSymlink != 0 {
// Accept file symlinks only.
i, err := os.Stat(file)
if err != nil || !i.Mode().IsRegular() {
fmt.Fprintf(os.Stderr, "%s: symlink\n", file)
return
}
info = i
}
if !isExe(file, info) {
fmt.Fprintf(os.Stderr, "%s: not executable file\n", file)
return
}
x, err := openExe(file)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", file, err)
return
}
defer x.Close()
vers, mod := findVers(x)
if vers == "" {
fmt.Fprintf(os.Stderr, "%s: go version not found\n", file)
return
}
fmt.Printf("%s: %s\n", file, vers)
if mod != "" {
fmt.Printf("\t%s\n", strings.ReplaceAll(mod[:len(mod)-1], "\n", "\n\t"))
}
}
// The build info blob left by the linker is identified by
// a 16-byte header, consisting of buildInfoMagic (14 bytes),
// the binary's pointer size (1 byte),
// and whether the binary is big endian (1 byte).
var buildInfoMagic = []byte("\xff Go buildinf:")
// findVers finds and returns the Go version and module version information
// in the executable x.
func findVers(x exe) (vers, mod string) {
// Read the first 64kB of text to find the build info blob.
text := x.DataStart()
data, err := x.ReadData(text, 64*1024)
if err != nil {
return
}
for ; !bytes.HasPrefix(data, buildInfoMagic); data = data[32:] {
if len(data) < 32 {
return
}
}
// Decode the blob.
ptrSize := int(data[14])
bigEndian := data[15] != 0
var bo binary.ByteOrder
if bigEndian {
bo = binary.BigEndian
} else {
bo = binary.LittleEndian
}
var readPtr func([]byte) uint64
if ptrSize == 4 {
readPtr = func(b []byte) uint64 { return uint64(bo.Uint32(b)) }
} else {
readPtr = bo.Uint64
}
vers = readString(x, ptrSize, readPtr, readPtr(data[16:]))
if vers == "" {
return
}
mod = readString(x, ptrSize, readPtr, readPtr(data[16+ptrSize:]))
if len(mod) >= 33 && mod[len(mod)-17] == '\n' {
// Strip module framing.
mod = mod[16 : len(mod)-16]
} else {
mod = ""
}
return
}
// readString returns the string at address addr in the executable x.
func readString(x exe, ptrSize int, readPtr func([]byte) uint64, addr uint64) string {
hdr, err := x.ReadData(addr, uint64(2*ptrSize))
if err != nil || len(hdr) < 2*ptrSize {
return ""
}
dataAddr := readPtr(hdr)
dataLen := readPtr(hdr[ptrSize:])
data, err := x.ReadData(dataAddr, dataLen)
if err != nil || uint64(len(data)) < dataLen {
return ""
}
return string(data)
}