fix test failures on windows

linux_test.go

@@ -0,0 +1,104 @@
+// +build linux
+
+package lumberjack
+
+import (
+	"os"
+	"syscall"
+	"testing"
+)
+
+func TestMaintainMode(t *testing.T) {
+	currentTime = fakeTime
+	dir := makeTempDir("TestMaintainMode", t)
+	defer os.RemoveAll(dir)
+
+	filename := logFile(dir)
+
+	mode := os.FileMode(0770)
+	f, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR, mode)
+	isNil(err, t)
+	f.Close()
+
+	l := &Logger{
+		Filename:   filename,
+		MaxBackups: 1,
+		MaxSize:    100, // megabytes
+	}
+	defer l.Close()
+	b := []byte("boo!")
+	n, err := l.Write(b)
+	isNil(err, t)
+	equals(len(b), n, t)
+
+	newFakeTime()
+
+	err = l.Rotate()
+	isNil(err, t)
+
+	filename2 := backupFile(dir)
+	info, err := os.Stat(filename)
+	isNil(err, t)
+	info2, err := os.Stat(filename2)
+	isNil(err, t)
+	equals(mode, info.Mode(), t)
+	equals(mode, info2.Mode(), t)
+}
+
+func TestMaintainOwner(t *testing.T) {
+	fakeC := fakeChown{}
+	os_Chown = fakeC.Set
+	os_Stat = fakeStat
+	defer func() {
+		os_Chown = os.Chown
+		os_Stat = os.Stat
+	}()
+	currentTime = fakeTime
+	dir := makeTempDir("TestMaintainOwner", t)
+	defer os.RemoveAll(dir)
+
+	filename := logFile(dir)
+
+	l := &Logger{
+		Filename:   filename,
+		MaxBackups: 1,
+		MaxSize:    100, // megabytes
+	}
+	defer l.Close()
+	b := []byte("boo!")
+	n, err := l.Write(b)
+	isNil(err, t)
+	equals(len(b), n, t)
+
+	newFakeTime()
+
+	err = l.Rotate()
+	isNil(err, t)
+
+	equals(555, fakeC.uid, t)
+	equals(666, fakeC.gid, t)
+}
+
+type fakeChown struct {
+	name string
+	uid  int
+	gid  int
+}
+
+func (f *fakeChown) Set(name string, uid, gid int) error {
+	f.name = name
+	f.uid = uid
+	f.gid = gid
+	return nil
+}
+
+func fakeStat(name string) (os.FileInfo, error) {
+	info, err := os.Stat(name)
+	if err != nil {
+		return info, err
+	}
+	stat := info.Sys().(*syscall.Stat_t)
+	stat.Uid = 555
+	stat.Gid = 666
+	return info, nil
+}