syncthing/lib/fs/basicfs_watch_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 http://mozilla.org/MPL/2.0/.
// +build !solaris,!darwin solaris,cgo darwin,cgo
package fs
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"syscall"
"testing"
"time"
"github.com/syncthing/notify"
)
func TestMain(m *testing.M) {
if err := os.RemoveAll(testDir); err != nil {
panic(err)
}
dir, err := filepath.Abs(".")
if err != nil {
panic("Cannot get absolute path to working dir")
}
dir, err = evalSymlinks(dir)
if err != nil {
panic("Cannot get real path to working dir")
}
testDirAbs = filepath.Join(dir, testDir)
if runtime.GOOS == "windows" {
testDirAbs = longFilenameSupport(testDirAbs)
}
testFs = NewFilesystem(FilesystemTypeBasic, testDirAbs)
backendBuffer = 10
exitCode := m.Run()
backendBuffer = 500
os.RemoveAll(testDir)
os.Exit(exitCode)
}
const (
testDir = "testdata"
)
var (
testDirAbs string
testFs Filesystem
)
func TestWatchIgnore(t *testing.T) {
name := "ignore"
file := "file"
ignored := "ignored"
testCase := func() {
createTestFile(name, file)
createTestFile(name, ignored)
}
expectedEvents := []Event{
{file, NonRemove},
}
allowedEvents := []Event{
{name, NonRemove},
}
testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), skipIgnoredDirs: true})
}
func TestWatchInclude(t *testing.T) {
name := "include"
file := "file"
ignored := "ignored"
testFs.MkdirAll(filepath.Join(name, ignored), 0777)
included := filepath.Join(ignored, "included")
testCase := func() {
createTestFile(name, file)
createTestFile(name, included)
}
expectedEvents := []Event{
{file, NonRemove},
{included, NonRemove},
}
allowedEvents := []Event{
{name, NonRemove},
}
testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), include: filepath.Join(name, included)})
}
func TestWatchRename(t *testing.T) {
name := "rename"
old := createTestFile(name, "oldfile")
new := "newfile"
testCase := func() {
renameTestFile(name, old, new)
}
destEvent := Event{new, Remove}
// Only on these platforms the removed file can be differentiated from
// the created file during renaming
if runtime.GOOS == "windows" || runtime.GOOS == "linux" || runtime.GOOS == "solaris" {
destEvent = Event{new, NonRemove}
}
expectedEvents := []Event{
{old, Remove},
destEvent,
}
allowedEvents := []Event{
{name, NonRemove},
}
// set the "allow others" flag because we might get the create of
// "oldfile" initially
testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
}
// TestWatchOutside checks that no changes from outside the folder make it in
func TestWatchOutside(t *testing.T) {
outChan := make(chan Event)
backendChan := make(chan notify.EventInfo, backendBuffer)
ctx, cancel := context.WithCancel(context.Background())
// testFs is Filesystem, but we need BasicFilesystem here
fs := newBasicFilesystem(testDirAbs)
go func() {
defer func() {
if recover() == nil {
select {
case <-ctx.Done(): // timed out
default:
t.Fatalf("Watch did not panic on receiving event outside of folder")
}
}
cancel()
}()
fs.watchLoop(".", testDirAbs, backendChan, outChan, fakeMatcher{}, ctx)
}()
backendChan <- fakeEventInfo(filepath.Join(filepath.Dir(testDirAbs), "outside"))
select {
case <-time.After(10 * time.Second):
cancel()
t.Errorf("Timed out before panicing")
case <-ctx.Done():
}
}
func TestWatchSubpath(t *testing.T) {
outChan := make(chan Event)
backendChan := make(chan notify.EventInfo, backendBuffer)
ctx, cancel := context.WithCancel(context.Background())
// testFs is Filesystem, but we need BasicFilesystem here
fs := newBasicFilesystem(testDirAbs)
abs, _ := fs.rooted("sub")
go fs.watchLoop("sub", testDirAbs, backendChan, outChan, fakeMatcher{}, ctx)
backendChan <- fakeEventInfo(filepath.Join(abs, "file"))
timeout := time.NewTimer(2 * time.Second)
select {
case <-timeout.C:
t.Errorf("Timed out before receiving an event")
cancel()
case ev := <-outChan:
if ev.Name != filepath.Join("sub", "file") {
t.Errorf("While watching a subfolder, received an event with unexpected path %v", ev.Name)
}
}
cancel()
}
// TestWatchOverflow checks that an event at the root is sent when maxFiles is reached
func TestWatchOverflow(t *testing.T) {
name := "overflow"
expectedEvents := []Event{
{".", NonRemove},
}
allowedEvents := []Event{
{name, NonRemove},
}
testCase := func() {
for i := 0; i < 5*backendBuffer; i++ {
file := "file" + strconv.Itoa(i)
createTestFile(name, file)
allowedEvents = append(allowedEvents, Event{file, NonRemove})
}
}
testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
}
func TestWatchErrorLinuxInterpretation(t *testing.T) {
if runtime.GOOS != "linux" {
t.Skip("testing of linux specific error codes")
}
var errTooManyFiles = &os.PathError{
Op: "error while traversing",
Path: "foo",
Err: syscall.Errno(24),
}
var errNoSpace = &os.PathError{
Op: "error while traversing",
Path: "bar",
Err: syscall.Errno(28),
}
if !reachedMaxUserWatches(errTooManyFiles) {
t.Error("Underlying error syscall.Errno(24) should be recognised to be about inotify limits.")
}
if !reachedMaxUserWatches(errNoSpace) {
t.Error("Underlying error syscall.Errno(28) should be recognised to be about inotify limits.")
}
err := errors.New("Another error")
if reachedMaxUserWatches(err) {
t.Errorf("This error does not concern inotify limits: %#v", err)
}
}
func TestWatchSymlinkedRoot(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("Involves symlinks")
}
name := "symlinkedRoot"
if err := testFs.MkdirAll(name, 0755); err != nil {
panic(fmt.Sprintf("Failed to create directory %s: %s", name, err))
}
defer testFs.RemoveAll(name)
root := filepath.Join(name, "root")
if err := testFs.MkdirAll(root, 0777); err != nil {
panic(err)
}
link := filepath.Join(name, "link")
if err := testFs.CreateSymlink(filepath.Join(testFs.URI(), root), link); err != nil {
panic(err)
}
linkedFs := NewFilesystem(FilesystemTypeBasic, filepath.Join(testFs.URI(), link))
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
if _, err := linkedFs.Watch(".", fakeMatcher{}, ctx, false); err != nil {
panic(err)
}
if err := linkedFs.MkdirAll("foo", 0777); err != nil {
panic(err)
}
// Give the panic some time to happen
sleepMs(100)
}
func TestUnrootedChecked(t *testing.T) {
var unrooted string
defer func() {
if recover() == nil {
t.Fatal("unrootedChecked did not panic on outside path, but returned", unrooted)
}
}()
fs := newBasicFilesystem(testDirAbs)
unrooted = fs.unrootedChecked("/random/other/path", testDirAbs)
}
func TestWatchIssue4877(t *testing.T) {
if runtime.GOOS != "windows" {
t.Skip("Windows specific test")
}
name := "Issue4877"
file := "file"
testCase := func() {
createTestFile(name, file)
}
expectedEvents := []Event{
{file, NonRemove},
}
allowedEvents := []Event{
{name, NonRemove},
}
volName := filepath.VolumeName(testDirAbs)
if volName == "" {
t.Fatalf("Failed to get volume name for path %v", testDirAbs)
}
origTestFs := testFs
testFs = NewFilesystem(FilesystemTypeBasic, strings.ToLower(volName)+strings.ToUpper(testDirAbs[len(volName):]))
defer func() {
testFs = origTestFs
}()
testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
}
// path relative to folder root, also creates parent dirs if necessary
func createTestFile(name string, file string) string {
joined := filepath.Join(name, file)
if err := testFs.MkdirAll(filepath.Dir(joined), 0755); err != nil {
panic(fmt.Sprintf("Failed to create parent directory for %s: %s", joined, err))
}
handle, err := testFs.Create(joined)
if err != nil {
panic(fmt.Sprintf("Failed to create test file %s: %s", joined, err))
}
handle.Close()
return file
}
func renameTestFile(name string, old string, new string) {
old = filepath.Join(name, old)
new = filepath.Join(name, new)
if err := testFs.Rename(old, new); err != nil {
panic(fmt.Sprintf("Failed to rename %s to %s: %s", old, new, err))
}
}
func sleepMs(ms int) {
time.Sleep(time.Duration(ms) * time.Millisecond)
}
func testScenario(t *testing.T, name string, testCase func(), expectedEvents, allowedEvents []Event, fm fakeMatcher) {
if err := testFs.MkdirAll(name, 0755); err != nil {
panic(fmt.Sprintf("Failed to create directory %s: %s", name, err))
}
defer testFs.RemoveAll(name)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventChan, err := testFs.Watch(name, fm, ctx, false)
if err != nil {
panic(err)
}
go testWatchOutput(t, name, eventChan, expectedEvents, allowedEvents, ctx, cancel)
testCase()
select {
case <-time.After(time.Minute):
t.Errorf("Timed out before receiving all expected events")
case <-ctx.Done():
}
}
func testWatchOutput(t *testing.T, name string, in <-chan Event, expectedEvents, allowedEvents []Event, ctx context.Context, cancel context.CancelFunc) {
var expected = make(map[Event]struct{})
for _, ev := range expectedEvents {
ev.Name = filepath.Join(name, ev.Name)
expected[ev] = struct{}{}
}
var received Event
var last Event
for {
if len(expected) == 0 {
cancel()
return
}
select {
case <-ctx.Done():
return
case received = <-in:
}
// apparently the backend sometimes sends repeat events
if last == received {
continue
}
if _, ok := expected[received]; !ok {
if len(allowedEvents) > 0 {
sleepMs(100) // To facilitate overflow
continue
}
t.Errorf("Received unexpected event %v expected one of %v", received, expected)
cancel()
return
}
delete(expected, received)
last = received
}
}
// Matches are done via direct comparison against both ignore and include
type fakeMatcher struct {
ignore string
include string
skipIgnoredDirs bool
}
func (fm fakeMatcher) ShouldIgnore(name string) bool {
return name != fm.include && name == fm.ignore
}
func (fm fakeMatcher) SkipIgnoredDirs() bool {
return fm.skipIgnoredDirs
}
type fakeEventInfo string
func (e fakeEventInfo) Path() string {
return string(e)
}
func (e fakeEventInfo) Event() notify.Event {
return notify.Write
}
func (e fakeEventInfo) Sys() interface{} {
return nil
}