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Source file test/fixedbugs/issue10607a.go

Documentation: test/fixedbugs

  // skip
  
  // Copyright 2015 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 is built by issue10607.go with a -B option.
  // Verify that we have one build-id note with the expected value.
  
  package main
  
  import (
  	"bytes"
  	"debug/elf"
  	"fmt"
  	"os"
  )
  
  func main() {
  	f, err := elf.Open("/proc/self/exe")
  	if err != nil {
  		if os.IsNotExist(err) {
  			return
  		}
  		fmt.Fprintln(os.Stderr, "opening /proc/self/exe:", err)
  		os.Exit(1)
  	}
  
  	c := 0
  	fail := false
  	for i, s := range f.Sections {
  		if s.Type != elf.SHT_NOTE {
  			continue
  		}
  
  		d, err := s.Data()
  		if err != nil {
  			fmt.Fprintf(os.Stderr, "reading data of note section %d: %v\n", i, err)
  			continue
  		}
  
  		for len(d) > 0 {
  			namesz := f.ByteOrder.Uint32(d)
  			descsz := f.ByteOrder.Uint32(d[4:])
  			typ := f.ByteOrder.Uint32(d[8:])
  
  			an := (namesz + 3) &^ 3
  			ad := (descsz + 3) &^ 3
  
  			if int(12+an+ad) > len(d) {
  				fmt.Fprintf(os.Stderr, "note section %d too short for header (%d < 12 + align(%d,4) + align(%d,4))\n", i, len(d), namesz, descsz)
  				break
  			}
  
  			// 3 == NT_GNU_BUILD_ID
  			if typ == 3 && namesz == 4 && bytes.Equal(d[12:16], []byte("GNU\000")) {
  				id := string(d[12+an:12+an+descsz])
  				if id == "\x12\x34\x56\x78" {
  					c++
  				} else {
  					fmt.Fprintf(os.Stderr, "wrong build ID data: %q\n", id)
  					fail = true
  				}
  			}
  
  			d = d[12+an+ad:]
  		}
  	}
  
  	if c == 0 {
  		fmt.Fprintln(os.Stderr, "no build-id note")
  		fail = true
  	} else if c > 1 {
  		fmt.Fprintln(os.Stderr, c, "build-id notes")
  		fail = true
  	}
  
  	if fail {
  		os.Exit(1)
  	}
  }
  

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