func startWalker(dir string, res chan<- fileInfo, abort <-chan struct{}) {
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
}
var f fileInfo
if ok, err := symlinks.IsSymlink(path); err == nil && ok {
f = fileInfo{
name: rn,
mode: os.ModeSymlink,
}
tgt, _, err := symlinks.Read(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(),
mod: info.ModTime().Unix(),
}
sum, err := md5file(path)
if err != nil {
return err
}
f.hash = sum
}
select {
case res <- f:
return nil
case <-abort:
return errors.New("abort")
}
}
go func() {
filepath.Walk(dir, walker)
close(res)
}()
}
// Request returns the specified data segment by reading it from local disk.
// Implements the protocol.Model interface.
func (m *Model) Request(deviceID protocol.DeviceID, folder, name string, offset int64, size int) ([]byte, error) {
// Verify that the requested file exists in the local model.
m.fmut.RLock()
r, ok := m.folderFiles[folder]
m.fmut.RUnlock()
if !ok {
l.Warnf("Request from %s for file %s in nonexistent folder %q", deviceID, name, folder)
return nil, ErrNoSuchFile
}
lf := r.Get(protocol.LocalDeviceID, name)
if lf.IsInvalid() || lf.IsDeleted() {
if debug {
l.Debugf("%v REQ(in): %s: %q / %q o=%d s=%d; invalid: %v", m, deviceID, folder, name, offset, size, lf)
}
return nil, ErrInvalid
}
if offset > lf.Size() {
if debug {
l.Debugf("%v REQ(in; nonexistent): %s: %q o=%d s=%d", m, deviceID, name, offset, size)
}
return nil, ErrNoSuchFile
}
if debug && deviceID != protocol.LocalDeviceID {
l.Debugf("%v REQ(in): %s: %q / %q o=%d s=%d", m, deviceID, folder, name, offset, size)
}
m.fmut.RLock()
fn := filepath.Join(m.folderCfgs[folder].Path, name)
m.fmut.RUnlock()
var reader io.ReaderAt
var err error
if lf.IsSymlink() {
target, _, err := symlinks.Read(fn)
if err != nil {
return nil, err
}
reader = strings.NewReader(target)
} else {
reader, err = os.Open(fn) // XXX: Inefficient, should cache fd?
if err != nil {
return nil, err
}
defer reader.(*os.File).Close()
}
buf := make([]byte, size)
_, err = reader.ReadAt(buf, offset)
if err != nil {
return nil, err
}
return buf, nil
}
// Request returns the specified data segment by reading it from local disk.
// Implements the protocol.Model interface.
func (m *Model) Request(deviceID protocol.DeviceID, folder, name string, offset int64, size int, hash []byte, flags uint32, options []protocol.Option) ([]byte, error) {
if offset < 0 || size < 0 {
return nil, protocol.ErrNoSuchFile
}
if !m.folderSharedWith(folder, deviceID) {
l.Warnf("Request from %s for file %s in unshared folder %q", deviceID, name, folder)
return nil, protocol.ErrNoSuchFile
}
if flags != 0 {
// We don't currently support or expect any flags.
return nil, fmt.Errorf("protocol error: unknown flags 0x%x in Request message", flags)
}
// Verify that the requested file exists in the local model. We only need
// to validate this file if we haven't done so recently, so we keep a
// cache of successfull results. "Recently" can be quite a long time, as
// we remove validation cache entries when we detect local changes. If
// we're out of sync here and the file actually doesn't exist any more, or
// has shrunk or something, then we'll anyway get a read error that we
// pass on to the other side.
m.rvmut.RLock()
validated := m.reqValidationCache[folder+"/"+name]
m.rvmut.RUnlock()
if time.Since(validated) > reqValidationTime {
m.fmut.RLock()
folderFiles, ok := m.folderFiles[folder]
m.fmut.RUnlock()
if !ok {
l.Warnf("Request from %s for file %s in nonexistent folder %q", deviceID, name, folder)
return nil, protocol.ErrNoSuchFile
}
// This call is really expensive for large files, as we load the full
// block list which may be megabytes and megabytes of data to allocate
// space for, read, and deserialize.
lf, ok := folderFiles.Get(protocol.LocalDeviceID, name)
if !ok {
return nil, protocol.ErrNoSuchFile
}
if lf.IsInvalid() || lf.IsDeleted() {
if debug {
l.Debugf("%v REQ(in): %s: %q / %q o=%d s=%d; invalid: %v", m, deviceID, folder, name, offset, size, lf)
}
return nil, protocol.ErrInvalid
}
if offset > lf.Size() {
if debug {
l.Debugf("%v REQ(in; nonexistent): %s: %q o=%d s=%d", m, deviceID, name, offset, size)
}
return nil, protocol.ErrNoSuchFile
}
m.rvmut.Lock()
m.reqValidationCache[folder+"/"+name] = time.Now()
if len(m.reqValidationCache) > reqValidationCacheSize {
// Don't let the cache grow infinitely
for name, validated := range m.reqValidationCache {
if time.Since(validated) > time.Minute {
delete(m.reqValidationCache, name)
}
}
}
m.rvmut.Unlock()
}
if debug && deviceID != protocol.LocalDeviceID {
l.Debugf("%v REQ(in): %s: %q / %q o=%d s=%d", m, deviceID, folder, name, offset, size)
}
m.fmut.RLock()
fn := filepath.Join(m.folderCfgs[folder].Path(), name)
m.fmut.RUnlock()
var reader io.ReaderAt
var err error
if info, err := os.Lstat(fn); err == nil && info.Mode()&os.ModeSymlink != 0 {
target, _, err := symlinks.Read(fn)
if err != nil {
return nil, err
}
reader = strings.NewReader(target)
} else {
// Cannot easily cache fd's because we might need to delete the file
// at any moment.
reader, err = os.Open(fn)
if err != nil {
return nil, err
}
defer reader.(*os.File).Close()
}
buf := make([]byte, size)
_, err = reader.ReadAt(buf, offset)
if err != nil {
return nil, err
}
return buf, nil
}
func (w *Walker) walkAndHashFiles(fchan chan protocol.FileInfo) filepath.WalkFunc {
now := time.Now()
return func(p string, info os.FileInfo, err error) error {
// Return value used when we are returning early and don't want to
// process the item. For directories, this means do-not-descend.
var skip error // nil
// info nil when error is not nil
if info != nil && info.IsDir() {
skip = filepath.SkipDir
}
if err != nil {
if debug {
l.Debugln("error:", p, info, err)
}
return skip
}
rn, err := filepath.Rel(w.Dir, p)
if err != nil {
if debug {
l.Debugln("rel error:", p, err)
}
return skip
}
if rn == "." {
return nil
}
mtime := info.ModTime()
if w.MtimeRepo != nil {
mtime = w.MtimeRepo.GetMtime(rn, mtime)
}
if w.TempNamer != nil && w.TempNamer.IsTemporary(rn) {
// A temporary file
if debug {
l.Debugln("temporary:", rn)
}
if info.Mode().IsRegular() && mtime.Add(w.TempLifetime).Before(now) {
os.Remove(p)
if debug {
l.Debugln("removing temporary:", rn, mtime)
}
}
return nil
}
if sn := filepath.Base(rn); sn == ".stignore" || sn == ".stfolder" ||
strings.HasPrefix(rn, ".stversions") || w.Matcher.Match(rn) {
// An ignored file
if debug {
l.Debugln("ignored:", rn)
}
return skip
}
if !utf8.ValidString(rn) {
l.Warnf("File name %q is not in UTF8 encoding; skipping.", rn)
return skip
}
var normalizedRn string
if runtime.GOOS == "darwin" {
// Mac OS X file names should always be NFD normalized.
normalizedRn = norm.NFD.String(rn)
} else {
// Every other OS in the known universe uses NFC or just plain
// doesn't bother to define an encoding. In our case *we* do care,
// so we enforce NFC regardless.
normalizedRn = norm.NFC.String(rn)
}
if rn != normalizedRn {
// The file name was not normalized.
if !w.AutoNormalize {
// We're not authorized to do anything about it, so complain and skip.
l.Warnf("File name %q is not in the correct UTF8 normalization form; skipping.", rn)
return skip
}
// We will attempt to normalize it.
normalizedPath := filepath.Join(w.Dir, normalizedRn)
if _, err := osutil.Lstat(normalizedPath); os.IsNotExist(err) {
// Nothing exists with the normalized filename. Good.
if err = os.Rename(p, normalizedPath); err != nil {
l.Infof(`Error normalizing UTF8 encoding of file "%s": %v`, rn, err)
return skip
}
l.Infof(`Normalized UTF8 encoding of file name "%s".`, rn)
} else {
// There is something already in the way at the normalized
// file name.
l.Infof(`File "%s" has UTF8 encoding conflict with another file; ignoring.`, rn)
return skip
}
rn = normalizedRn
}
var cf protocol.FileInfo
var ok bool
// Index wise symlinks are always files, regardless of what the target
// is, because symlinks carry their target path as their content.
if info.Mode()&os.ModeSymlink == os.ModeSymlink {
// If the target is a directory, do NOT descend down there. This
// will cause files to get tracked, and removing the symlink will
// as a result remove files in their real location.
if !symlinks.Supported {
return skip
}
// We always rehash symlinks as they have no modtime or
// permissions. We check if they point to the old target by
// checking that their existing blocks match with the blocks in
// the index.
target, flags, err := symlinks.Read(p)
flags = flags & protocol.SymlinkTypeMask
if err != nil {
if debug {
l.Debugln("readlink error:", p, err)
}
return skip
}
blocks, err := Blocks(strings.NewReader(target), w.BlockSize, 0)
if err != nil {
if debug {
l.Debugln("hash link error:", p, err)
}
return skip
}
if w.CurrentFiler != nil {
// A symlink is "unchanged", if
// - it exists
// - it wasn't deleted (because it isn't now)
// - it was a symlink
// - it wasn't invalid
// - the symlink type (file/dir) was the same
// - the block list (i.e. hash of target) was the same
cf, ok = w.CurrentFiler.CurrentFile(rn)
if ok && !cf.IsDeleted() && cf.IsSymlink() && !cf.IsInvalid() && SymlinkTypeEqual(flags, cf.Flags) && BlocksEqual(cf.Blocks, blocks) {
return skip
}
}
f := protocol.FileInfo{
Name: rn,
Version: cf.Version.Update(w.ShortID),
Flags: protocol.FlagSymlink | flags | protocol.FlagNoPermBits | 0666,
Modified: 0,
Blocks: blocks,
}
if debug {
l.Debugln("symlink to hash:", p, f)
}
fchan <- f
return skip
}
if info.Mode().IsDir() {
if w.CurrentFiler != nil {
// A directory is "unchanged", if it
// - exists
// - has the same permissions as previously, unless we are ignoring permissions
// - was not marked deleted (since it apparently exists now)
// - was a directory previously (not a file or something else)
// - was not a symlink (since it's a directory now)
// - was not invalid (since it looks valid now)
cf, ok = w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, uint32(info.Mode()))
if ok && permUnchanged && !cf.IsDeleted() && cf.IsDirectory() && !cf.IsSymlink() && !cf.IsInvalid() {
return nil
}
}
flags := uint32(protocol.FlagDirectory)
if w.IgnorePerms {
flags |= protocol.FlagNoPermBits | 0777
} else {
flags |= uint32(info.Mode() & maskModePerm)
}
f := protocol.FileInfo{
Name: rn,
Version: cf.Version.Update(w.ShortID),
Flags: flags,
Modified: mtime.Unix(),
}
if debug {
l.Debugln("dir:", p, f)
}
fchan <- f
return nil
}
if info.Mode().IsRegular() {
curMode := uint32(info.Mode())
if runtime.GOOS == "windows" && osutil.IsWindowsExecutable(rn) {
curMode |= 0111
}
if w.CurrentFiler != nil {
// A file is "unchanged", if it
// - exists
// - has the same permissions as previously, unless we are ignoring permissions
// - was not marked deleted (since it apparently exists now)
// - had the same modification time as it has now
// - was not a directory previously (since it's a file now)
// - was not a symlink (since it's a file now)
// - was not invalid (since it looks valid now)
// - has the same size as previously
cf, ok = w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, curMode)
if ok && permUnchanged && !cf.IsDeleted() && cf.Modified == mtime.Unix() && !cf.IsDirectory() &&
!cf.IsSymlink() && !cf.IsInvalid() && cf.Size() == info.Size() {
return nil
}
if debug {
l.Debugln("rescan:", cf, mtime.Unix(), info.Mode()&os.ModePerm)
}
}
var flags = curMode & uint32(maskModePerm)
if w.IgnorePerms {
flags = protocol.FlagNoPermBits | 0666
}
f := protocol.FileInfo{
Name: rn,
Version: cf.Version.Update(w.ShortID),
Flags: flags,
Modified: mtime.Unix(),
}
if debug {
l.Debugln("to hash:", p, f)
}
fchan <- f
}
return nil
}
}
func (w *Walker) walkAndHashFiles(fchan chan protocol.FileInfo) filepath.WalkFunc {
return func(p string, info os.FileInfo, err error) error {
if err != nil {
if debug {
l.Debugln("error:", p, info, err)
}
return nil
}
rn, err := filepath.Rel(w.Dir, p)
if err != nil {
if debug {
l.Debugln("rel error:", p, err)
}
return nil
}
if rn == "." {
return nil
}
if w.TempNamer != nil && w.TempNamer.IsTemporary(rn) {
// A temporary file
if debug {
l.Debugln("temporary:", rn)
}
return nil
}
if sn := filepath.Base(rn); sn == ".stignore" || sn == ".stfolder" ||
strings.HasPrefix(rn, ".stversions") || (w.Matcher != nil && w.Matcher.Match(rn)) {
// An ignored file
if debug {
l.Debugln("ignored:", rn)
}
if info.IsDir() {
return filepath.SkipDir
}
return nil
}
if (runtime.GOOS == "linux" || runtime.GOOS == "windows") && !norm.NFC.IsNormalString(rn) {
l.Warnf("File %q contains non-NFC UTF-8 sequences and cannot be synced. Consider renaming.", rn)
return nil
}
// We must perform this check, as symlinks on Windows are always
// .IsRegular or .IsDir unlike on Unix.
// Index wise symlinks are always files, regardless of what the target
// is, because symlinks carry their target path as their content.
isSymlink, _ := symlinks.IsSymlink(p)
if isSymlink {
var rval error
// If the target is a directory, do NOT descend down there.
// This will cause files to get tracked, and removing the symlink
// will as a result remove files in their real location.
// But do not SkipDir if the target is not a directory, as it will
// stop scanning the current directory.
if info.IsDir() {
rval = filepath.SkipDir
}
// We always rehash symlinks as they have no modtime or
// permissions.
// We check if they point to the old target by checking that
// their existing blocks match with the blocks in the index.
// If we don't have a filer or don't support symlinks, skip.
if w.CurrentFiler == nil || !symlinks.Supported {
return rval
}
target, flags, err := symlinks.Read(p)
flags = flags & protocol.SymlinkTypeMask
if err != nil {
if debug {
l.Debugln("readlink error:", p, err)
}
return rval
}
blocks, err := Blocks(strings.NewReader(target), w.BlockSize, 0)
if err != nil {
if debug {
l.Debugln("hash link error:", p, err)
}
return rval
}
cf := w.CurrentFiler.CurrentFile(rn)
if !cf.IsDeleted() && cf.IsSymlink() && SymlinkTypeEqual(flags, cf.Flags) && BlocksEqual(cf.Blocks, blocks) {
return rval
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: protocol.FlagSymlink | flags | protocol.FlagNoPermBits | 0666,
Modified: 0,
Blocks: blocks,
}
if debug {
l.Debugln("symlink to hash:", p, f)
}
fchan <- f
return rval
}
if info.Mode().IsDir() {
if w.CurrentFiler != nil {
cf := w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, uint32(info.Mode()))
if !cf.IsDeleted() && cf.IsDirectory() && permUnchanged {
return nil
}
}
var flags uint32 = protocol.FlagDirectory
if w.IgnorePerms {
flags |= protocol.FlagNoPermBits | 0777
} else {
flags |= uint32(info.Mode() & os.ModePerm)
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: flags,
Modified: info.ModTime().Unix(),
}
if debug {
l.Debugln("dir:", p, f)
}
fchan <- f
return nil
}
if info.Mode().IsRegular() {
if w.CurrentFiler != nil {
cf := w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, uint32(info.Mode()))
if !cf.IsDeleted() && cf.Modified == info.ModTime().Unix() && permUnchanged {
return nil
}
if debug {
l.Debugln("rescan:", cf, info.ModTime().Unix(), info.Mode()&os.ModePerm)
}
}
var flags = uint32(info.Mode() & os.ModePerm)
if w.IgnorePerms {
flags = protocol.FlagNoPermBits | 0666
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: flags,
Modified: info.ModTime().Unix(),
}
if debug {
l.Debugln("to hash:", p, f)
}
fchan <- f
}
return nil
}
}
func (w *Walker) walkAndHashFiles(fchan chan protocol.FileInfo) filepath.WalkFunc {
now := time.Now()
return func(p string, info os.FileInfo, err error) error {
if err != nil {
if debug {
l.Debugln("error:", p, info, err)
}
return nil
}
rn, err := filepath.Rel(w.Dir, p)
if err != nil {
if debug {
l.Debugln("rel error:", p, err)
}
return nil
}
if rn == "." {
return nil
}
if w.TempNamer != nil && w.TempNamer.IsTemporary(rn) {
// A temporary file
if debug {
l.Debugln("temporary:", rn)
}
if info.Mode().IsRegular() && info.ModTime().Add(w.TempLifetime).Before(now) {
os.Remove(p)
if debug {
l.Debugln("removing temporary:", rn, info.ModTime())
}
}
return nil
}
if sn := filepath.Base(rn); sn == ".stignore" || sn == ".stfolder" ||
strings.HasPrefix(rn, ".stversions") || (w.Matcher != nil && w.Matcher.Match(rn)) {
// An ignored file
if debug {
l.Debugln("ignored:", rn)
}
if info.IsDir() {
return filepath.SkipDir
}
return nil
}
if (runtime.GOOS == "linux" || runtime.GOOS == "windows") && !norm.NFC.IsNormalString(rn) {
l.Warnf("File %q contains non-NFC UTF-8 sequences and cannot be synced. Consider renaming.", rn)
return nil
}
// Index wise symlinks are always files, regardless of what the target
// is, because symlinks carry their target path as their content.
if info.Mode()&os.ModeSymlink == os.ModeSymlink {
var rval error
// If the target is a directory, do NOT descend down there. This
// will cause files to get tracked, and removing the symlink will
// as a result remove files in their real location. But do not
// SkipDir if the target is not a directory, as it will stop
// scanning the current directory.
if info.IsDir() {
rval = filepath.SkipDir
}
// If we don't support symlinks, skip.
if !symlinks.Supported {
return rval
}
// We always rehash symlinks as they have no modtime or
// permissions. We check if they point to the old target by
// checking that their existing blocks match with the blocks in
// the index.
target, flags, err := symlinks.Read(p)
flags = flags & protocol.SymlinkTypeMask
if err != nil {
if debug {
l.Debugln("readlink error:", p, err)
}
return rval
}
blocks, err := Blocks(strings.NewReader(target), w.BlockSize, 0)
if err != nil {
if debug {
l.Debugln("hash link error:", p, err)
}
return rval
}
if w.CurrentFiler != nil {
// A symlink is "unchanged", if
// - it exists
// - it wasn't deleted (because it isn't now)
// - it was a symlink
// - it wasn't invalid
// - the symlink type (file/dir) was the same
// - the block list (i.e. hash of target) was the same
cf, ok := w.CurrentFiler.CurrentFile(rn)
if ok && !cf.IsDeleted() && cf.IsSymlink() && !cf.IsInvalid() && SymlinkTypeEqual(flags, cf.Flags) && BlocksEqual(cf.Blocks, blocks) {
return rval
}
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: protocol.FlagSymlink | flags | protocol.FlagNoPermBits | 0666,
Modified: 0,
Blocks: blocks,
}
if debug {
l.Debugln("symlink to hash:", p, f)
}
fchan <- f
return rval
}
if info.Mode().IsDir() {
if w.CurrentFiler != nil {
// A directory is "unchanged", if it
// - exists
// - has the same permissions as previously, unless we are ignoring permissions
// - was not marked deleted (since it apparently exists now)
// - was a directory previously (not a file or something else)
// - was not a symlink (since it's a directory now)
// - was not invalid (since it looks valid now)
cf, ok := w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, uint32(info.Mode()))
if ok && permUnchanged && !cf.IsDeleted() && cf.IsDirectory() && !cf.IsSymlink() && !cf.IsInvalid() {
return nil
}
}
flags := uint32(protocol.FlagDirectory)
if w.IgnorePerms {
flags |= protocol.FlagNoPermBits | 0777
} else {
flags |= uint32(info.Mode() & os.ModePerm)
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: flags,
Modified: info.ModTime().Unix(),
}
if debug {
l.Debugln("dir:", p, f)
}
fchan <- f
return nil
}
if info.Mode().IsRegular() {
if w.CurrentFiler != nil {
// A file is "unchanged", if it
// - exists
// - has the same permissions as previously, unless we are ignoring permissions
// - was not marked deleted (since it apparently exists now)
// - had the same modification time as it has now
// - was not a directory previously (since it's a file now)
// - was not a symlink (since it's a file now)
// - was not invalid (since it looks valid now)
// - has the same size as previously
cf, ok := w.CurrentFiler.CurrentFile(rn)
permUnchanged := w.IgnorePerms || !cf.HasPermissionBits() || PermsEqual(cf.Flags, uint32(info.Mode()))
if ok && permUnchanged && !cf.IsDeleted() && cf.Modified == info.ModTime().Unix() && !cf.IsDirectory() &&
!cf.IsSymlink() && !cf.IsInvalid() && cf.Size() == info.Size() {
return nil
}
if debug {
l.Debugln("rescan:", cf, info.ModTime().Unix(), info.Mode()&os.ModePerm)
}
}
var flags = uint32(info.Mode() & os.ModePerm)
if w.IgnorePerms {
flags = protocol.FlagNoPermBits | 0666
}
f := protocol.FileInfo{
Name: rn,
Version: lamport.Default.Tick(0),
Flags: flags,
Modified: info.ModTime().Unix(),
}
if debug {
l.Debugln("to hash:", p, f)
}
fchan <- f
}
return nil
}
}
