dd931d9b48
Reviewed-on: https://go-review.googlesource.com/136435 gotools/: * Makefile.am (mostlyclean-local): Run chmod on check-go-dir to make sure it is writable. (check-go-tools): Likewise. (check-vet): Copy internal/objabi to check-vet-dir. * Makefile.in: Rebuild. From-SVN: r264546
91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
// Copyright 2017 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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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"strings"
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"cmd/internal/buildid"
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)
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func usage() {
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fmt.Fprintf(os.Stderr, "usage: go tool buildid [-w] file\n")
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flag.PrintDefaults()
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os.Exit(2)
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}
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var wflag = flag.Bool("w", false, "write build ID")
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// taken from cmd/go/internal/work/buildid.go
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func hashToString(h [32]byte) string {
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const b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
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const chunks = 5
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var dst [chunks * 4]byte
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for i := 0; i < chunks; i++ {
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v := uint32(h[3*i])<<16 | uint32(h[3*i+1])<<8 | uint32(h[3*i+2])
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dst[4*i+0] = b64[(v>>18)&0x3F]
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dst[4*i+1] = b64[(v>>12)&0x3F]
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dst[4*i+2] = b64[(v>>6)&0x3F]
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dst[4*i+3] = b64[v&0x3F]
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}
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return string(dst[:])
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}
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func main() {
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log.SetPrefix("buildid: ")
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log.SetFlags(0)
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flag.Usage = usage
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flag.Parse()
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if flag.NArg() != 1 {
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usage()
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}
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file := flag.Arg(0)
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id, err := buildid.ReadFile(file)
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if err != nil {
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log.Fatal(err)
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}
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if !*wflag {
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fmt.Printf("%s\n", id)
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return
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}
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// Keep in sync with src/cmd/go/internal/work/buildid.go:updateBuildID
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f, err := os.Open(file)
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if err != nil {
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log.Fatal(err)
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}
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matches, hash, err := buildid.FindAndHash(f, id, 0)
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if err != nil {
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log.Fatal(err)
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}
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f.Close()
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newID := id[:strings.LastIndex(id, "/")] + "/" + hashToString(hash)
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if len(newID) != len(id) {
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log.Fatalf("%s: build ID length mismatch %q vs %q", file, id, newID)
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}
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if len(matches) == 0 {
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return
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}
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f, err = os.OpenFile(file, os.O_WRONLY, 0)
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if err != nil {
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log.Fatal(err)
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}
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if err := buildid.Rewrite(f, matches, newID); err != nil {
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log.Fatal(err)
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}
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if err := f.Close(); err != nil {
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log.Fatal(err)
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}
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}
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