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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.
package gc_test
import (
"bytes"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"testing"
)
func TestReproducibleBuilds(t *testing.T) {
tests := []string{
"issue20272.go",
"issue27013.go",
"issue30202.go",
}
testenv.MustHaveGoBuild(t)
iters := 10
if testing.Short() {
iters = 4
}
t.Parallel()
for _, test := range tests {
test := test
t.Run(test, func(t *testing.T) {
t.Parallel()
var want []byte
tmp, err := ioutil.TempFile("", "")
if err != nil {
t.Fatalf("temp file creation failed: %v", err)
}
defer os.Remove(tmp.Name())
defer tmp.Close()
for i := 0; i < iters; i++ {
// Note: use -c 2 to expose any nondeterminism which is the result
// of the runtime scheduler.
out, err := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-c", "2", "-o", tmp.Name(), filepath.Join("testdata", "reproducible", test)).CombinedOutput()
if err != nil {
t.Fatalf("failed to compile: %v\n%s", err, out)
}
obj, err := ioutil.ReadFile(tmp.Name())
if err != nil {
t.Fatalf("failed to read object file: %v", err)
}
if i == 0 {
want = obj
} else {
if !bytes.Equal(want, obj) {
t.Fatalf("builds produced different output after %d iters (%d bytes vs %d bytes)", i, len(want), len(obj))
}
}
}
})
}
}
func TestIssue38068(t *testing.T) {
testenv.MustHaveGoBuild(t)
t.Parallel()
// Compile a small package with and without the concurrent
// backend, then check to make sure that the resulting archives
// are identical. Note: this uses "go tool compile" instead of
// "go build" since the latter will generate differnent build IDs
// if it sees different command line flags.
scenarios := []struct {
tag string
args string
libpath string
}{
{tag: "serial", args: "-c=1"},
{tag: "concurrent", args: "-c=2"}}
tmpdir, err := ioutil.TempDir("", "TestIssue38068")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
src := filepath.Join("testdata", "reproducible", "issue38068.go")
for i := range scenarios {
s := &scenarios[i]
s.libpath = filepath.Join(tmpdir, s.tag+".a")
// Note: use of "-p" required in order for DWARF to be generated.
cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-trimpath", "-p=issue38068", "-buildid=", s.args, "-o", s.libpath, src)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("%v: %v:\n%s", cmd.Args, err, out)
}
}
readBytes := func(fn string) []byte {
payload, err := ioutil.ReadFile(fn)
if err != nil {
t.Fatalf("failed to read executable '%s': %v", fn, err)
}
return payload
}
b1 := readBytes(scenarios[0].libpath)
b2 := readBytes(scenarios[1].libpath)
if !bytes.Equal(b1, b2) {
t.Fatalf("concurrent and serial builds produced different output")
}
}
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