syncthing/lib/fs/mtimefs_test.go

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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package fs
import (
"errors"
"io/ioutil"
"os"
"testing"
"time"
)
func TestMtimeFS(t *testing.T) {
os.RemoveAll("testdata")
defer os.RemoveAll("testdata")
os.Mkdir("testdata", 0755)
ioutil.WriteFile("testdata/exists0", []byte("hello"), 0644)
ioutil.WriteFile("testdata/exists1", []byte("hello"), 0644)
ioutil.WriteFile("testdata/exists2", []byte("hello"), 0644)
// a random time with nanosecond precision
testTime := time.Unix(1234567890, 123456789)
mtimefs := NewMtimeFS(DefaultFilesystem, make(mapStore))
// Do one Chtimes call that will go through to the normal filesystem
osChtimes = os.Chtimes
if err := mtimefs.Chtimes("testdata/exists0", testTime, testTime); err != nil {
t.Error("Should not have failed:", err)
}
// Do one call that gets an error back from the underlying Chtimes
osChtimes = failChtimes
if err := mtimefs.Chtimes("testdata/exists1", testTime, testTime); err != nil {
t.Error("Should not have failed:", err)
}
// Do one call that gets struck by an exceptionally evil Chtimes
osChtimes = evilChtimes
if err := mtimefs.Chtimes("testdata/exists2", testTime, testTime); err != nil {
t.Error("Should not have failed:", err)
}
// All of the calls were successful, so an Lstat on them should return
// the test timestamp.
for _, file := range []string{"testdata/exists0", "testdata/exists1", "testdata/exists2"} {
if info, err := mtimefs.Lstat(file); err != nil {
t.Error("Lstat shouldn't fail:", err)
} else if !info.ModTime().Equal(testTime) {
t.Errorf("Time mismatch; %v != expected %v", info.ModTime(), testTime)
}
}
// The two last files should certainly not have the correct timestamp
// when looking directly on disk though.
for _, file := range []string{"testdata/exists1", "testdata/exists2"} {
if info, err := os.Lstat(file); err != nil {
t.Error("Lstat shouldn't fail:", err)
} else if info.ModTime().Equal(testTime) {
t.Errorf("Unexpected time match; %v == %v", info.ModTime(), testTime)
}
}
// Changing the timestamp on disk should be reflected in a new Lstat
// call. Choose a time that is likely to be able to be on all reasonable
// filesystems.
testTime = time.Now().Add(5 * time.Hour).Truncate(time.Minute)
os.Chtimes("testdata/exists0", testTime, testTime)
if info, err := mtimefs.Lstat("testdata/exists0"); err != nil {
t.Error("Lstat shouldn't fail:", err)
} else if !info.ModTime().Equal(testTime) {
t.Errorf("Time mismatch; %v != expected %v", info.ModTime(), testTime)
}
}
// The mapStore is a simple database
type mapStore map[string][]byte
func (s mapStore) PutBytes(key string, data []byte) {
s[key] = data
}
func (s mapStore) Bytes(key string) (data []byte, ok bool) {
data, ok = s[key]
return
}
func (s mapStore) Delete(key string) {
delete(s, key)
}
// failChtimes does nothing, and fails
func failChtimes(name string, mtime, atime time.Time) error {
return errors.New("no")
}
// evilChtimes will set an mtime that's 300 days in the future of what was
// asked for, and truncate the time to the closest hour.
func evilChtimes(name string, mtime, atime time.Time) error {
return os.Chtimes(name, mtime.Add(300*time.Hour).Truncate(time.Hour), atime.Add(300*time.Hour).Truncate(time.Hour))
}