ceremonyclient/pebble/internal/mkbench/testutil.go

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2024-01-03 07:31:42 +00:00
// Copyright 2021 The LevelDB-Go and Pebble 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 main
import (
"bytes"
"io"
"os"
"path/filepath"
"runtime"
"testing"
"github.com/cockroachdb/errors"
"github.com/cockroachdb/errors/oserror"
"github.com/pmezard/go-difflib/difflib"
)
// filesEqual returns the diff between contents of a and b.
func filesEqual(a, b string) error {
aBytes, err := os.ReadFile(a)
if err != nil {
return err
}
bBytes, err := os.ReadFile(b)
if err != nil {
return err
}
// Normalize newlines.
aBytes = bytes.Replace(aBytes, []byte{13, 10} /* \r\n */, []byte{10} /* \n */, -1)
bBytes = bytes.Replace(bBytes, []byte{13, 10}, []byte{10}, -1)
d, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
A: difflib.SplitLines(string(aBytes)),
B: difflib.SplitLines(string(bBytes)),
})
if d != "" {
return errors.Errorf("a != b\ndiff = %s", d)
}
return nil
}
// copyDir recursively copies the fromPath to toPath, excluding certain paths.
func copyDir(fromPath, toPath string) error {
walkFn := func(path, pathRel string, info os.FileInfo) error {
// Preserve the directory structure.
if info.IsDir() {
err := os.Mkdir(filepath.Join(toPath, pathRel), 0700)
if err != nil && !oserror.IsNotExist(err) {
return err
}
return nil
}
// Copy files.
fIn, err := os.Open(path)
if err != nil {
return err
}
defer func() { _ = fIn.Close() }()
fOut, err := os.OpenFile(filepath.Join(toPath, pathRel), os.O_CREATE|os.O_WRONLY, 0700)
if err != nil {
return err
}
defer func() { _ = fOut.Close() }()
_, err = io.Copy(fOut, fIn)
return err
}
return walkDir(fromPath, walkFn)
}
func maybeSkip(t *testing.T) {
// The paths in the per-run summary.json files are UNIX-oriented. To avoid
// duplicating the test fixtures just for Windows, just skip the tests on
// Windows.
if runtime.GOOS == "windows" {
t.Skipf("skipped on windows")
}
}