syncthing/test/util.go
Simon Frei 932d8c69de lib/fs: Properly handle case insensitive systems (fixes #1787, fixes #2739, fixes #5708)
With this change we emulate a case sensitive filesystem on top of
insensitive filesystems. This means we correctly pick up case-only renames
and throw a case conflict error when there would be multiple files differing
only in case.

This safety check has a small performance hit (about 20% more filesystem
operations when scanning for changes). The new advanced folder option
`caseSensitiveFS` can be used to disable the safety checks, retaining the
previous behavior on systems known to be fully case sensitive.

Co-authored-by: Jakob Borg <jakob@kastelo.net>
2020-07-28 11:15:11 +02:00

565 lines
12 KiB
Go

// Copyright (C) 2014 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/.
// +build integration
package integration
import (
"crypto/md5"
cr "crypto/rand"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"math/rand"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
"testing"
"time"
"unicode"
"github.com/syncthing/syncthing/lib/rc"
)
func init() {
rand.Seed(42)
}
const (
id1 = "I6KAH76-66SLLLB-5PFXSOA-UFJCDZC-YAOMLEK-CP2GB32-BV5RQST-3PSROAU"
id2 = "MRIW7OK-NETT3M4-N6SBWME-N25O76W-YJKVXPH-FUMQJ3S-P57B74J-GBITBAC"
id3 = "373HSRP-QLPNLIE-JYKZVQF-P4PKZ63-R2ZE6K3-YD442U2-JHBGBQG-WWXAHAU"
apiKey = "abc123"
)
func generateFiles(dir string, files, maxexp int, srcname string) error {
return generateFilesWithTime(dir, files, maxexp, srcname, time.Now())
}
func generateFilesWithTime(dir string, files, maxexp int, srcname string, t0 time.Time) error {
fd, err := os.Open(srcname)
if err != nil {
return err
}
for i := 0; i < files; i++ {
n := randomName()
if rand.Float64() < 0.05 {
// Some files and directories are dotfiles
n = "." + n
}
p0 := filepath.Join(dir, string(n[0]), n[0:2])
err = os.MkdirAll(p0, 0755)
if err != nil {
log.Fatal(err)
}
p1 := filepath.Join(p0, n)
s := int64(1 << uint(rand.Intn(maxexp)))
a := int64(128 * 1024)
if a > s {
a = s
}
s += rand.Int63n(a)
if err := generateOneFile(fd, p1, s, t0); err != nil {
return err
}
}
return nil
}
func generateOneFile(fd io.ReadSeeker, p1 string, s int64, t0 time.Time) error {
src := io.LimitReader(&inifiteReader{fd}, int64(s))
dst, err := os.Create(p1)
if err != nil {
return err
}
_, err = io.Copy(dst, src)
if err != nil {
return err
}
err = dst.Close()
if err != nil {
return err
}
os.Chmod(p1, os.FileMode(rand.Intn(0777)|0400))
t := t0.Add(-time.Duration(rand.Intn(30*86400)) * time.Second)
err = os.Chtimes(p1, t, t)
if err != nil {
return err
}
return nil
}
func alterFiles(dir string) error {
err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if os.IsNotExist(err) {
// Something we deleted. Never mind.
return nil
}
info, err = os.Stat(path)
if err != nil {
// Something we deleted while walking. Ignore.
return nil
}
if strings.HasPrefix(filepath.Base(path), "test-") {
return nil
}
switch filepath.Base(path) {
case ".stfolder":
return nil
case ".stversions":
return nil
}
// File structure is base/x/xy/xyz12345...
// comps == 1: base (don't touch)
// comps == 2: base/x (must be dir)
// comps == 3: base/x/xy (must be dir)
// comps > 3: base/x/xy/xyz12345... (can be dir or file)
comps := len(strings.Split(path, string(os.PathSeparator)))
r := rand.Intn(10)
switch {
case r == 0 && comps > 2:
// Delete every tenth file or directory, except top levels
return removeAll(path)
case r == 1 && info.Mode().IsRegular():
if info.Mode()&0200 != 0200 {
// Not owner writable. Fix.
if err = os.Chmod(path, 0644); err != nil {
return err
}
}
// Overwrite a random kilobyte of every tenth file
fd, err := os.OpenFile(path, os.O_RDWR, 0644)
if err != nil {
return err
}
if info.Size() > 1024 {
_, err = fd.Seek(rand.Int63n(info.Size()), os.SEEK_SET)
if err != nil {
return err
}
}
_, err = io.Copy(fd, io.LimitReader(cr.Reader, 1024))
if err != nil {
return err
}
return fd.Close()
// Change capitalization
case r == 2 && comps > 3 && rand.Float64() < 0.2:
if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
// Syncthing is currently broken for case-only renames on case-
// insensitive platforms.
// https://github.com/syncthing/syncthing/issues/1787
return nil
}
base := []rune(filepath.Base(path))
for i, r := range base {
if rand.Float64() < 0.5 {
base[i] = unicode.ToLower(r)
} else {
base[i] = unicode.ToUpper(r)
}
}
newPath := filepath.Join(filepath.Dir(path), string(base))
if newPath != path {
return os.Rename(path, newPath)
}
/*
This doesn't in fact work. Sometimes it appears to. We need to get this sorted...
// Switch between files and directories
case r == 3 && comps > 3 && rand.Float64() < 0.2:
if !info.Mode().IsRegular() {
err = removeAll(path)
if err != nil {
return err
}
d1 := []byte("I used to be a dir: " + path)
err := ioutil.WriteFile(path, d1, 0644)
if err != nil {
return err
}
} else {
err := os.Remove(path)
if err != nil {
return err
}
err = os.MkdirAll(path, 0755)
if err != nil {
return err
}
generateFiles(path, 10, 20, "../LICENSE")
}
return err
*/
/*
This fails. Bug?
// Rename the file, while potentially moving it up in the directory hierarchy
case r == 4 && comps > 2 && (info.Mode().IsRegular() || rand.Float64() < 0.2):
rpath := filepath.Dir(path)
if rand.Float64() < 0.2 {
for move := rand.Intn(comps - 1); move > 0; move-- {
rpath = filepath.Join(rpath, "..")
}
}
return osutil.TryRename(path, filepath.Join(rpath, randomName()))
*/
}
return nil
})
if err != nil {
return err
}
return generateFiles(dir, 25, 20, "../LICENSE")
}
func ReadRand(bs []byte) (int, error) {
var r uint32
for i := range bs {
if i%4 == 0 {
r = uint32(rand.Int63())
}
bs[i] = byte(r >> uint((i%4)*8))
}
return len(bs), nil
}
func randomName() string {
var b [16]byte
ReadRand(b[:])
return fmt.Sprintf("%x", b[:])
}
type inifiteReader struct {
rd io.ReadSeeker
}
func (i *inifiteReader) Read(bs []byte) (int, error) {
n, err := i.rd.Read(bs)
if err == io.EOF {
err = nil
i.rd.Seek(0, 0)
}
return n, err
}
// rm -rf
func removeAll(dirs ...string) error {
for _, dir := range dirs {
files, err := filepath.Glob(dir)
if err != nil {
return err
}
for _, file := range files {
// Set any non-writeable files and dirs to writeable. This is necessary for os.RemoveAll to work on Windows.
filepath.Walk(file, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.Mode()&0700 != 0700 {
os.Chmod(path, 0777)
}
return nil
})
os.RemoveAll(file)
}
}
return nil
}
// Compare a number of directories. Returns nil if the contents are identical,
// otherwise an error describing the first found difference.
func compareDirectories(dirs ...string) error {
chans := make([]chan fileInfo, len(dirs))
for i := range chans {
chans[i] = make(chan fileInfo)
}
errcs := make([]chan error, len(dirs))
abort := make(chan struct{})
for i := range dirs {
errcs[i] = startWalker(dirs[i], chans[i], abort)
}
res := make([]fileInfo, len(dirs))
for {
numDone := 0
for i := range chans {
fi, ok := <-chans[i]
if !ok {
err, hasError := <-errcs[i]
if hasError {
close(abort)
return err
}
numDone++
}
res[i] = fi
}
for i := 1; i < len(res); i++ {
if res[i] != res[0] {
close(abort)
return fmt.Errorf("mismatch; %#v (%s) != %#v (%s)", res[i], dirs[i], res[0], dirs[0])
}
}
if numDone == len(dirs) {
return nil
}
}
}
func directoryContents(dir string) ([]fileInfo, error) {
res := make(chan fileInfo)
errc := startWalker(dir, res, nil)
var files []fileInfo
for f := range res {
files = append(files, f)
}
return files, <-errc
}
func mergeDirectoryContents(c ...[]fileInfo) []fileInfo {
m := make(map[string]fileInfo)
for _, l := range c {
for _, f := range l {
if cur, ok := m[f.name]; !ok || cur.mod < f.mod {
m[f.name] = f
}
}
}
res := make([]fileInfo, len(m))
i := 0
for _, f := range m {
res[i] = f
i++
}
sort.Sort(fileInfoList(res))
return res
}
func compareDirectoryContents(actual, expected []fileInfo) error {
if len(actual) != len(expected) {
return fmt.Errorf("len(actual) = %d; len(expected) = %d", len(actual), len(expected))
}
for i := range actual {
if actual[i] != expected[i] {
return fmt.Errorf("mismatch; actual %#v != expected %#v", actual[i], expected[i])
}
}
return nil
}
type fileInfo struct {
name string
mode os.FileMode
mod int64
hash [16]byte
size int64
}
func (f fileInfo) String() string {
return fmt.Sprintf("%s %04o %d %x", f.name, f.mode, f.mod, f.hash)
}
type fileInfoList []fileInfo
func (l fileInfoList) Len() int {
return len(l)
}
func (l fileInfoList) Less(a, b int) bool {
return l[a].name < l[b].name
}
func (l fileInfoList) Swap(a, b int) {
l[a], l[b] = l[b], l[a]
}
func startWalker(dir string, res chan<- fileInfo, abort <-chan struct{}) chan error {
walker := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
rn, _ := filepath.Rel(dir, path)
if rn == "." || rn == ".stfolder" {
return nil
}
if rn == ".stversions" {
return filepath.SkipDir
}
var f fileInfo
if info.Mode()&os.ModeSymlink != 0 {
f = fileInfo{
name: rn,
mode: os.ModeSymlink,
}
tgt, err := os.Readlink(path)
if err != nil {
return err
}
h := md5.New()
h.Write([]byte(tgt))
hash := h.Sum(nil)
copy(f.hash[:], hash)
} else if info.IsDir() {
f = fileInfo{
name: rn,
mode: info.Mode(),
// hash and modtime zero for directories
}
} else {
f = fileInfo{
name: rn,
mode: info.Mode(),
// comparing timestamps with better precision than a second
// is problematic as there is rounding and truncatign going
// on at every level
mod: info.ModTime().Unix(),
size: info.Size(),
}
sum, err := md5file(path)
if err != nil {
return err
}
f.hash = sum
}
select {
case res <- f:
return nil
case <-abort:
return errors.New("abort")
}
}
errc := make(chan error)
go func() {
err := filepath.Walk(dir, walker)
close(res)
if err != nil {
errc <- err
}
close(errc)
}()
return errc
}
func md5file(fname string) (hash [16]byte, err error) {
f, err := os.Open(fname)
if err != nil {
return
}
defer f.Close()
h := md5.New()
io.Copy(h, f)
hb := h.Sum(nil)
copy(hash[:], hb)
return
}
func isTimeout(err error) bool {
if err == nil {
return false
}
return strings.Contains(err.Error(), "use of closed network connection") ||
strings.Contains(err.Error(), "request canceled while waiting") ||
strings.Contains(err.Error(), "operation timed out")
}
func getTestName() string {
callers := make([]uintptr, 100)
runtime.Callers(1, callers)
for i, caller := range callers {
f := runtime.FuncForPC(caller)
if f != nil {
if f.Name() == "testing.tRunner" {
testf := runtime.FuncForPC(callers[i-1])
if testf != nil {
path := strings.Split(testf.Name(), ".")
return path[len(path)-1]
}
}
}
}
return time.Now().String()
}
func checkedStop(t *testing.T, p *rc.Process) {
if _, err := p.Stop(); err != nil {
t.Fatal(err)
}
}
func startInstance(t *testing.T, i int) *rc.Process {
log.Printf("Starting instance %d...", i)
addr := fmt.Sprintf("127.0.0.1:%d", 8080+i)
log := fmt.Sprintf("logs/%s-%d-%d.out", getTestName(), i, time.Now().Unix()%86400)
p := rc.NewProcess(addr)
p.LogTo(log)
if err := p.Start("../bin/syncthing", "-home", fmt.Sprintf("h%d", i), "-no-browser"); err != nil {
t.Fatal(err)
}
p.AwaitStartup()
p.PauseAll()
return p
}
func symlinksSupported() bool {
tmp, err := ioutil.TempDir("", "symlink-test")
if err != nil {
return false
}
defer os.RemoveAll(tmp)
err = os.Symlink("tmp", filepath.Join(tmp, "link"))
return err == nil
}