Beispiel #1
0
// handleDir creates or updates the given directory
func (p *Puller) handleDir(file protocol.FileInfo) {
	realName := filepath.Join(p.dir, file.Name)
	mode := os.FileMode(file.Flags & 0777)
	if p.ignorePerms {
		mode = 0755
	}

	if debug {
		curFile := p.model.CurrentFolderFile(p.folder, file.Name)
		l.Debugf("need dir\n\t%v\n\t%v", file, curFile)
	}

	info, err := os.Lstat(realName)
	isLink, _ := symlinks.IsSymlink(realName)
	switch {
	// There is already something under that name, but it's a file/link.
	// Most likely a file/link is getting replaced with a directory.
	// Remove the file/link and fall through to directory creation.
	case isLink || (err == nil && !info.IsDir()):
		err = osutil.InWritableDir(os.Remove, realName)
		if err != nil {
			l.Infof("Puller (folder %q, dir %q): %v", p.folder, file.Name, err)
			return
		}
		fallthrough
	// The directory doesn't exist, so we create it with the right
	// mode bits from the start.
	case err != nil && os.IsNotExist(err):
		// We declare a function that acts on only the path name, so
		// we can pass it to InWritableDir. We use a regular Mkdir and
		// not MkdirAll because the parent should already exist.
		mkdir := func(path string) error {
			return os.Mkdir(path, mode)
		}

		if err = osutil.InWritableDir(mkdir, realName); err == nil {
			p.model.updateLocal(p.folder, file)
		} else {
			l.Infof("Puller (folder %q, dir %q): %v", p.folder, file.Name, err)
		}
		return
	// Weird error when stat()'ing the dir. Probably won't work to do
	// anything else with it if we can't even stat() it.
	case err != nil:
		l.Infof("Puller (folder %q, dir %q): %v", p.folder, file.Name, err)
		return
	}

	// The directory already exists, so we just correct the mode bits. (We
	// don't handle modification times on directories, because that sucks...)
	// It's OK to change mode bits on stuff within non-writable directories.

	if p.ignorePerms {
		p.model.updateLocal(p.folder, file)
	} else if err := os.Chmod(realName, mode); err == nil {
		p.model.updateLocal(p.folder, file)
	} else {
		l.Infof("Puller (folder %q, dir %q): %v", p.folder, file.Name, err)
	}
}
Beispiel #2
0
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)
	}()
}
Beispiel #3
0
func (p *Puller) performFinish(state *sharedPullerState) {
	// Verify the file against expected hashes
	fd, err := os.Open(state.tempName)
	if err != nil {
		l.Warnln("puller: final:", err)
		return
	}
	err = scanner.Verify(fd, protocol.BlockSize, state.file.Blocks)
	fd.Close()
	if err != nil {
		l.Infoln("puller:", state.file.Name, err, "(file changed during pull?)")
		return
	}

	// Set the correct permission bits on the new file
	if !p.ignorePerms {
		err = os.Chmod(state.tempName, os.FileMode(state.file.Flags&0777))
		if err != nil {
			l.Warnln("puller: final:", err)
			return
		}
	}

	// Set the correct timestamp on the new file
	t := time.Unix(state.file.Modified, 0)
	err = os.Chtimes(state.tempName, t, t)
	if err != nil {
		if p.lenientMtimes {
			// We accept the failure with a warning here and allow the sync to
			// continue. We'll sync the new mtime back to the other devices later.
			// If they have the same problem & setting, we might never get in
			// sync.
			l.Infof("Puller (folder %q, file %q): final: %v (continuing anyway as requested)", p.folder, state.file.Name, err)
		} else {
			l.Warnln("puller: final:", err)
			return
		}
	}

	// If we should use versioning, let the versioner archive the old
	// file before we replace it. Archiving a non-existent file is not
	// an error.
	if p.versioner != nil {
		err = p.versioner.Archive(state.realName)
		if err != nil {
			l.Warnln("puller: final:", err)
			return
		}
	}

	// If the target path is a symlink or a directory, we cannot copy
	// over it, hence remove it before proceeding.
	stat, err := os.Lstat(state.realName)
	isLink, _ := symlinks.IsSymlink(state.realName)
	if isLink || (err == nil && stat.IsDir()) {
		osutil.InWritableDir(os.Remove, state.realName)
	}
	// Replace the original content with the new one
	err = osutil.Rename(state.tempName, state.realName)
	if err != nil {
		l.Warnln("puller: final:", err)
		return
	}

	// If it's a symlink, the target of the symlink is inside the file.
	if state.file.IsSymlink() {
		content, err := ioutil.ReadFile(state.realName)
		if err != nil {
			l.Warnln("puller: final: reading symlink:", err)
			return
		}

		// Remove the file, and replace it with a symlink.
		err = osutil.InWritableDir(func(path string) error {
			os.Remove(path)
			return symlinks.Create(path, string(content), state.file.Flags)
		}, state.realName)
		if err != nil {
			l.Warnln("puller: final: creating symlink:", err)
			return
		}
	}

	// Record the updated file in the index
	p.model.updateLocal(p.folder, state.file)
}
Beispiel #4
0
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
	}
}