Esempio n. 1
0
// deleteFile attempts to delete the given file
func (f *rwFolder) deleteFile(file protocol.FileInfo) {
	// Used in the defer closure below, updated by the function body. Take
	// care not declare another err.
	var err error

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   file.Name,
		"type":   "file",
		"action": "delete",
	})

	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "delete",
		})
	}()

	realName, err := rootedJoinedPath(f.dir, file.Name)
	if err != nil {
		f.newError(file.Name, err)
		return
	}

	cur, ok := f.model.CurrentFolderFile(f.folderID, file.Name)
	if ok && f.inConflict(cur.Version, file.Version) {
		// There is a conflict here. Move the file to a conflict copy instead
		// of deleting. Also merge with the version vector we had, to indicate
		// we have resolved the conflict.
		file.Version = file.Version.Merge(cur.Version)
		err = osutil.InWritableDir(f.moveForConflict, realName)
	} else if f.versioner != nil {
		err = osutil.InWritableDir(f.versioner.Archive, realName)
	} else {
		err = osutil.InWritableDir(os.Remove, realName)
	}

	if err == nil || os.IsNotExist(err) {
		// It was removed or it doesn't exist to start with
		f.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteFile}
	} else if _, serr := f.mtimeFS.Lstat(realName); serr != nil && !os.IsPermission(serr) {
		// We get an error just looking at the file, and it's not a permission
		// problem. Lets assume the error is in fact some variant of "file
		// does not exist" (possibly expressed as some parent being a file and
		// not a directory etc) and that the delete is handled.
		f.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteFile}
	} else {
		l.Infof("Puller (folder %q, file %q): delete: %v", f.folderID, file.Name, err)
		f.newError(file.Name, err)
	}
}
Esempio n. 2
0
// deleteDir attempts to delete the given directory
func (p *rwFolder) deleteDir(file protocol.FileInfo) {
	var err error
	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": p.folder,
		"item":   file.Name,
		"type":   "dir",
		"action": "delete",
	})
	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": p.folder,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "dir",
			"action": "delete",
		})
	}()

	realName := filepath.Join(p.dir, file.Name)
	// Delete any temporary files lying around in the directory
	dir, _ := os.Open(realName)
	if dir != nil {
		files, _ := dir.Readdirnames(-1)
		for _, file := range files {
			if defTempNamer.IsTemporary(file) {
				osutil.InWritableDir(osutil.Remove, filepath.Join(realName, file))
			}
		}
		dir.Close()
	}

	err = osutil.InWritableDir(osutil.Remove, realName)
	if err == nil || os.IsNotExist(err) {
		// It was removed or it doesn't exist to start with
		p.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteDir}
	} else if _, serr := os.Lstat(realName); serr != nil && !os.IsPermission(serr) {
		// We get an error just looking at the directory, and it's not a
		// permission problem. Lets assume the error is in fact some variant
		// of "file does not exist" (possibly expressed as some parent being a
		// file and not a directory etc) and that the delete is handled.
		p.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteDir}
	} else {
		l.Infof("Puller (folder %q, dir %q): delete: %v", p.folder, file.Name, err)
		p.newError(file.Name, err)
	}
}
Esempio n. 3
0
// deleteDir attempts to delete the given directory
func (f *rwFolder) deleteDir(file protocol.FileInfo, matcher *ignore.Matcher) {
	// Used in the defer closure below, updated by the function body. Take
	// care not declare another err.
	var err error

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   file.Name,
		"type":   "dir",
		"action": "delete",
	})

	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "dir",
			"action": "delete",
		})
	}()

	realName, err := rootedJoinedPath(f.dir, file.Name)
	if err != nil {
		f.newError(file.Name, err)
		return
	}
	// Delete any temporary files lying around in the directory
	dir, _ := os.Open(realName)
	if dir != nil {
		files, _ := dir.Readdirnames(-1)
		for _, dirFile := range files {
			fullDirFile := filepath.Join(file.Name, dirFile)
			if defTempNamer.IsTemporary(dirFile) || (matcher != nil && matcher.Match(fullDirFile).IsDeletable()) {
				os.RemoveAll(filepath.Join(f.dir, fullDirFile))
			}
		}
		dir.Close()
	}

	err = osutil.InWritableDir(os.Remove, realName)
	if err == nil || os.IsNotExist(err) {
		// It was removed or it doesn't exist to start with
		f.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteDir}
	} else if _, serr := f.mtimeFS.Lstat(realName); serr != nil && !os.IsPermission(serr) {
		// We get an error just looking at the directory, and it's not a
		// permission problem. Lets assume the error is in fact some variant
		// of "file does not exist" (possibly expressed as some parent being a
		// file and not a directory etc) and that the delete is handled.
		f.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteDir}
	} else {
		l.Infof("Puller (folder %q, dir %q): delete: %v", f.folderID, file.Name, err)
		f.newError(file.Name, err)
	}
}
Esempio n. 4
0
func TestInWriteableDir(t *testing.T) {
	err := os.RemoveAll("testdata")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll("testdata")

	os.Mkdir("testdata", 0700)
	os.Mkdir("testdata/rw", 0700)
	os.Mkdir("testdata/ro", 0500)

	create := func(name string) error {
		fd, err := os.Create(name)
		if err != nil {
			return err
		}
		fd.Close()
		return nil
	}

	// These should succeed

	err = osutil.InWritableDir(create, "testdata/file")
	if err != nil {
		t.Error("testdata/file:", err)
	}
	err = osutil.InWritableDir(create, "testdata/rw/foo")
	if err != nil {
		t.Error("testdata/rw/foo:", err)
	}
	err = osutil.InWritableDir(os.Remove, "testdata/rw/foo")
	if err != nil {
		t.Error("testdata/rw/foo:", err)
	}

	err = osutil.InWritableDir(create, "testdata/ro/foo")
	if err != nil {
		t.Error("testdata/ro/foo:", err)
	}
	err = osutil.InWritableDir(os.Remove, "testdata/ro/foo")
	if err != nil {
		t.Error("testdata/ro/foo:", err)
	}

	// These should not

	err = osutil.InWritableDir(create, "testdata/nonexistent/foo")
	if err == nil {
		t.Error("testdata/nonexistent/foo returned nil error")
	}
	err = osutil.InWritableDir(create, "testdata/file/foo")
	if err == nil {
		t.Error("testdata/file/foo returned nil error")
	}
}
Esempio n. 5
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func TestInWritableDirWindowsRename(t *testing.T) {
	if runtime.GOOS != "windows" {
		t.Skipf("Tests not required")
		return
	}

	err := os.RemoveAll("testdata")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Chmod("testdata/windows/ro/readonlynew", 0700)
	defer os.RemoveAll("testdata")

	create := func(name string) error {
		fd, err := os.Create(name)
		if err != nil {
			return err
		}
		fd.Close()
		return nil
	}

	os.Mkdir("testdata", 0700)

	os.Mkdir("testdata/windows", 0500)
	os.Mkdir("testdata/windows/ro", 0500)
	create("testdata/windows/ro/readonly")
	os.Chmod("testdata/windows/ro/readonly", 0500)

	for _, path := range []string{"testdata/windows/ro/readonly", "testdata/windows/ro", "testdata/windows"} {
		err := os.Rename(path, path+"new")
		if err == nil {
			t.Skipf("seem like this test doesn't work here")
			return
		}
	}

	rename := func(path string) error {
		return osutil.Rename(path, path+"new")
	}

	for _, path := range []string{"testdata/windows/ro/readonly", "testdata/windows/ro", "testdata/windows"} {
		err := osutil.InWritableDir(rename, path)
		if err != nil {
			t.Errorf("Unexpected error %s: %s", path, err)
		}
		_, err = os.Stat(path + "new")
		if err != nil {
			t.Errorf("Unexpected error %s: %s", path, err)
		}
	}
}
Esempio n. 6
0
func ChangeType(path string, flags uint32) error {
	target, cflags, err := Read(path)
	if err != nil {
		return err
	}
	// If it's the same type, nothing to do.
	if cflags&protocol.SymlinkTypeMask == flags&protocol.SymlinkTypeMask {
		return nil
	}

	// If the actual type is unknown, but the new type is file, nothing to do
	if cflags&protocol.FlagSymlinkMissingTarget != 0 && flags&protocol.FlagDirectory == 0 {
		return nil
	}
	return osutil.InWritableDir(func(path string) error {
		// It should be a symlink as well hence no need to change permissions on
		// the file.
		os.Remove(path)
		return Create(path, target, flags)
	}, path)
}
func (fs BasicFilesystem) ChangeSymlinkType(path string, tt LinkTargetType) error {
	target, existingTargetType, err := fs.ReadSymlink(path)
	if err != nil {
		return err
	}
	// If it's the same type, nothing to do.
	if tt == existingTargetType {
		return nil
	}

	// If the actual type is unknown, but the new type is file, nothing to do
	if existingTargetType == LinkTargetUnknown && tt != LinkTargetDirectory {
		return nil
	}
	return osutil.InWritableDir(func(path string) error {
		// It should be a symlink as well hence no need to change permissions on
		// the file.
		os.Remove(path)
		return fs.CreateSymlink(path, target, tt)
	}, path)
}
Esempio n. 8
0
func ChangeType(path string, tt TargetType) error {
	target, exTt, err := Read(path)
	if err != nil {
		return err
	}
	// If it's the same type, nothing to do.
	if tt == exTt {
		return nil
	}

	// If the actual type is unknown, but the new type is file, nothing to do
	if exTt == TargetUnknown && tt != TargetDirectory {
		return nil
	}
	return osutil.InWritableDir(func(path string) error {
		// It should be a symlink as well hence no need to change permissions on
		// the file.
		os.Remove(path)
		return Create(path, target, tt)
	}, path)
}
Esempio n. 9
0
func TestInWritableDirWindowsRemove(t *testing.T) {
	// os.Remove should remove read only things on windows

	if runtime.GOOS != "windows" {
		t.Skipf("Tests not required")
		return
	}

	err := os.RemoveAll("testdata")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Chmod("testdata/windows/ro/readonlynew", 0700)
	defer os.RemoveAll("testdata")

	create := func(name string) error {
		fd, err := os.Create(name)
		if err != nil {
			return err
		}
		fd.Close()
		return nil
	}

	os.Mkdir("testdata", 0700)

	os.Mkdir("testdata/windows", 0500)
	os.Mkdir("testdata/windows/ro", 0500)
	create("testdata/windows/ro/readonly")
	os.Chmod("testdata/windows/ro/readonly", 0500)

	for _, path := range []string{"testdata/windows/ro/readonly", "testdata/windows/ro", "testdata/windows"} {
		err := osutil.InWritableDir(os.Remove, path)
		if err != nil {
			t.Errorf("Unexpected error %s: %s", path, err)
		}
	}
}
Esempio n. 10
0
// handleSymlink creates or updates the given symlink
func (f *rwFolder) handleSymlink(file protocol.FileInfo) {
	// Used in the defer closure below, updated by the function body. Take
	// care not declare another err.
	var err error

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   file.Name,
		"type":   "symlink",
		"action": "update",
	})

	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "symlink",
			"action": "update",
		})
	}()

	realName, err := rootedJoinedPath(f.dir, file.Name)
	if err != nil {
		f.newError(file.Name, err)
		return
	}

	if shouldDebug() {
		curFile, _ := f.model.CurrentFolderFile(f.folderID, file.Name)
		l.Debugf("need symlink\n\t%v\n\t%v", file, curFile)
	}

	if len(file.SymlinkTarget) == 0 {
		// Index entry from a Syncthing predating the support for including
		// the link target in the index entry. We log this as an error.
		err = errors.New("incompatible symlink entry; rescan with newer Syncthing on source")
		l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
		f.newError(file.Name, err)
		return
	}

	if _, err = f.mtimeFS.Lstat(realName); err == nil {
		// There is already something under that name. Remove it to replace
		// with the symlink. This also handles the "change symlink type"
		// path.
		err = osutil.InWritableDir(os.Remove, realName)
		if err != nil {
			l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
			f.newError(file.Name, err)
			return
		}
	}

	tt := symlinks.TargetFile
	if file.IsDirectory() {
		tt = symlinks.TargetDirectory
	}

	// We declare a function that acts on only the path name, so
	// we can pass it to InWritableDir.
	createLink := func(path string) error {
		return symlinks.Create(path, file.SymlinkTarget, tt)
	}

	if err = osutil.InWritableDir(createLink, realName); err == nil {
		f.dbUpdates <- dbUpdateJob{file, dbUpdateHandleSymlink}
	} else {
		l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
		f.newError(file.Name, err)
	}
}
Esempio n. 11
0
// handleDir creates or updates the given directory
func (f *rwFolder) handleDir(file protocol.FileInfo) {
	// Used in the defer closure below, updated by the function body. Take
	// care not declare another err.
	var err error

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   file.Name,
		"type":   "dir",
		"action": "update",
	})

	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "dir",
			"action": "update",
		})
	}()

	realName, err := rootedJoinedPath(f.dir, file.Name)
	if err != nil {
		f.newError(file.Name, err)
		return
	}
	mode := os.FileMode(file.Permissions & 0777)
	if f.ignorePermissions(file) {
		mode = 0777
	}

	if shouldDebug() {
		curFile, _ := f.model.CurrentFolderFile(f.folderID, file.Name)
		l.Debugf("need dir\n\t%v\n\t%v", file, curFile)
	}

	info, err := f.mtimeFS.Lstat(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 err == nil && (!info.IsDir() || info.Mode()&os.ModeSymlink != 0):
		err = osutil.InWritableDir(os.Remove, realName)
		if err != nil {
			l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
			f.newError(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 {
			err = os.Mkdir(path, mode)
			if err != nil || f.ignorePermissions(file) {
				return err
			}

			// Stat the directory so we can check its permissions.
			info, err := f.mtimeFS.Lstat(path)
			if err != nil {
				return err
			}

			// Mask for the bits we want to preserve and add them in to the
			// directories permissions.
			return os.Chmod(path, mode|(info.Mode()&retainBits))
		}

		if err = osutil.InWritableDir(mkdir, realName); err == nil {
			f.dbUpdates <- dbUpdateJob{file, dbUpdateHandleDir}
		} else {
			l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
			f.newError(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", f.folderID, file.Name, err)
		f.newError(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 f.ignorePermissions(file) {
		f.dbUpdates <- dbUpdateJob{file, dbUpdateHandleDir}
	} else if err := os.Chmod(realName, mode|(info.Mode()&retainBits)); err == nil {
		f.dbUpdates <- dbUpdateJob{file, dbUpdateHandleDir}
	} else {
		l.Infof("Puller (folder %q, dir %q): %v", f.folderID, file.Name, err)
		f.newError(file.Name, err)
	}
}
Esempio n. 12
0
func (f *rwFolder) performFinish(state *sharedPullerState) error {
	// Set the correct permission bits on the new file
	if !f.ignorePermissions(state.file) {
		if err := os.Chmod(state.tempName, os.FileMode(state.file.Permissions&0777)); err != nil {
			return err
		}
	}

	if stat, err := f.mtimeFS.Lstat(state.realName); err == nil {
		// There is an old file or directory already in place. We need to
		// handle that.

		switch {
		case stat.IsDir() || stat.Mode()&os.ModeSymlink != 0:
			// It's a directory or a symlink. These are not versioned or
			// archived for conflicts, only removed (which of course fails for
			// non-empty directories).

			// TODO: This is the place where we want to remove temporary files
			// and future hard ignores before attempting a directory delete.
			// Should share code with f.deletDir().

			if err = osutil.InWritableDir(os.Remove, state.realName); err != nil {
				return err
			}

		case f.inConflict(state.version, state.file.Version):
			// The new file has been changed in conflict with the existing one. We
			// should file it away as a conflict instead of just removing or
			// archiving. Also merge with the version vector we had, to indicate
			// we have resolved the conflict.

			state.file.Version = state.file.Version.Merge(state.version)
			if err = osutil.InWritableDir(f.moveForConflict, state.realName); err != nil {
				return err
			}

		case f.versioner != nil:
			// 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 err = f.versioner.Archive(state.realName); err != nil {
				return err
			}
		}
	}

	// Replace the original content with the new one. If it didn't work,
	// leave the temp file in place for reuse.
	if err := osutil.TryRename(state.tempName, state.realName); err != nil {
		return err
	}

	// Set the correct timestamp on the new file
	f.mtimeFS.Chtimes(state.realName, state.file.ModTime(), state.file.ModTime()) // never fails

	// Record the updated file in the index
	f.dbUpdates <- dbUpdateJob{state.file, dbUpdateHandleFile}
	return nil
}
Esempio n. 13
0
// renameFile attempts to rename an existing file to a destination
// and set the right attributes on it.
func (p *rwFolder) renameFile(source, target protocol.FileInfo) {
	var err error
	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": p.folder,
		"item":   source.Name,
		"type":   "file",
		"action": "delete",
	})
	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": p.folder,
		"item":   target.Name,
		"type":   "file",
		"action": "update",
	})
	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": p.folder,
			"item":   source.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "delete",
		})
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": p.folder,
			"item":   target.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "update",
		})
	}()

	if debug {
		l.Debugln(p, "taking rename shortcut", source.Name, "->", target.Name)
	}

	from := filepath.Join(p.dir, source.Name)
	to := filepath.Join(p.dir, target.Name)

	if p.versioner != nil {
		err = osutil.Copy(from, to)
		if err == nil {
			err = osutil.InWritableDir(p.versioner.Archive, from)
		}
	} else {
		err = osutil.TryRename(from, to)
	}

	if err == nil {
		// The file was renamed, so we have handled both the necessary delete
		// of the source and the creation of the target. Fix-up the metadata,
		// and update the local index of the target file.

		p.dbUpdates <- dbUpdateJob{source, dbUpdateDeleteFile}

		err = p.shortcutFile(target)
		if err != nil {
			l.Infof("Puller (folder %q, file %q): rename from %q metadata: %v", p.folder, target.Name, source.Name, err)
			p.newError(target.Name, err)
			return
		}

		p.dbUpdates <- dbUpdateJob{target, dbUpdateHandleFile}
	} else {
		// We failed the rename so we have a source file that we still need to
		// get rid of. Attempt to delete it instead so that we make *some*
		// progress. The target is unhandled.

		err = osutil.InWritableDir(osutil.Remove, from)
		if err != nil {
			l.Infof("Puller (folder %q, file %q): delete %q after failed rename: %v", p.folder, target.Name, source.Name, err)
			p.newError(target.Name, err)
			return
		}

		p.dbUpdates <- dbUpdateJob{source, dbUpdateDeleteFile}
	}
}
Esempio n. 14
0
// handleFile queues the copies and pulls as necessary for a single new or
// changed file.
func (p *rwFolder) handleFile(file protocol.FileInfo, copyChan chan<- copyBlocksState, finisherChan chan<- *sharedPullerState) {
	curFile, ok := p.model.CurrentFolderFile(p.folder, file.Name)

	if ok && len(curFile.Blocks) == len(file.Blocks) && scanner.BlocksEqual(curFile.Blocks, file.Blocks) {
		// We are supposed to copy the entire file, and then fetch nothing. We
		// are only updating metadata, so we don't actually *need* to make the
		// copy.
		l.Debugln(p, "taking shortcut on", file.Name)

		events.Default.Log(events.ItemStarted, map[string]string{
			"folder": p.folder,
			"item":   file.Name,
			"type":   "file",
			"action": "metadata",
		})

		p.queue.Done(file.Name)

		var err error
		if file.IsSymlink() {
			err = p.shortcutSymlink(file)
		} else {
			err = p.shortcutFile(file)
		}

		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": p.folder,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "metadata",
		})

		if err != nil {
			l.Infoln("Puller: shortcut:", err)
			p.newError(file.Name, err)
		} else {
			p.dbUpdates <- dbUpdateJob{file, dbUpdateShortcutFile}
		}

		return
	}

	if free, err := osutil.DiskFreeBytes(p.dir); err == nil && free < file.Size() {
		l.Warnf(`Folder "%s": insufficient disk space in %s for %s: have %.2f MiB, need %.2f MiB`, p.folder, p.dir, file.Name, float64(free)/1024/1024, float64(file.Size())/1024/1024)
		p.newError(file.Name, errors.New("insufficient space"))
		return
	}

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": p.folder,
		"item":   file.Name,
		"type":   "file",
		"action": "update",
	})

	scanner.PopulateOffsets(file.Blocks)

	// Figure out the absolute filenames we need once and for all
	tempName := filepath.Join(p.dir, defTempNamer.TempName(file.Name))
	realName := filepath.Join(p.dir, file.Name)

	reused := 0
	var blocks []protocol.BlockInfo

	// Check for an old temporary file which might have some blocks we could
	// reuse.
	tempBlocks, err := scanner.HashFile(tempName, protocol.BlockSize, 0, nil)
	if err == nil {
		// Check for any reusable blocks in the temp file
		tempCopyBlocks, _ := scanner.BlockDiff(tempBlocks, file.Blocks)

		// block.String() returns a string unique to the block
		existingBlocks := make(map[string]struct{}, len(tempCopyBlocks))
		for _, block := range tempCopyBlocks {
			existingBlocks[block.String()] = struct{}{}
		}

		// Since the blocks are already there, we don't need to get them.
		for _, block := range file.Blocks {
			_, ok := existingBlocks[block.String()]
			if !ok {
				blocks = append(blocks, block)
			}
		}

		// The sharedpullerstate will know which flags to use when opening the
		// temp file depending if we are reusing any blocks or not.
		reused = len(file.Blocks) - len(blocks)
		if reused == 0 {
			// Otherwise, discard the file ourselves in order for the
			// sharedpuller not to panic when it fails to exclusively create a
			// file which already exists
			osutil.InWritableDir(osutil.Remove, tempName)
		}
	} else {
		blocks = file.Blocks
	}

	s := sharedPullerState{
		file:        file,
		folder:      p.folder,
		tempName:    tempName,
		realName:    realName,
		copyTotal:   len(blocks),
		copyNeeded:  len(blocks),
		reused:      reused,
		ignorePerms: p.ignorePermissions(file),
		version:     curFile.Version,
		mut:         sync.NewMutex(),
	}

	l.Debugf("%v need file %s; copy %d, reused %v", p, file.Name, len(blocks), reused)

	cs := copyBlocksState{
		sharedPullerState: &s,
		blocks:            blocks,
	}
	copyChan <- cs
}
Esempio n. 15
0
// renameFile attempts to rename an existing file to a destination
// and set the right attributes on it.
func (f *rwFolder) renameFile(source, target protocol.FileInfo) {
	// Used in the defer closure below, updated by the function body. Take
	// care not declare another err.
	var err error

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   source.Name,
		"type":   "file",
		"action": "delete",
	})
	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   target.Name,
		"type":   "file",
		"action": "update",
	})

	defer func() {
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   source.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "delete",
		})
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   target.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "update",
		})
	}()

	l.Debugln(f, "taking rename shortcut", source.Name, "->", target.Name)

	from, err := rootedJoinedPath(f.dir, source.Name)
	if err != nil {
		f.newError(source.Name, err)
		return
	}
	to, err := rootedJoinedPath(f.dir, target.Name)
	if err != nil {
		f.newError(target.Name, err)
		return
	}

	if f.versioner != nil {
		err = osutil.Copy(from, to)
		if err == nil {
			err = osutil.InWritableDir(f.versioner.Archive, from)
		}
	} else {
		err = osutil.TryRename(from, to)
	}

	if err == nil {
		// The file was renamed, so we have handled both the necessary delete
		// of the source and the creation of the target. Fix-up the metadata,
		// and update the local index of the target file.

		f.dbUpdates <- dbUpdateJob{source, dbUpdateDeleteFile}

		err = f.shortcutFile(target)
		if err != nil {
			l.Infof("Puller (folder %q, file %q): rename from %q metadata: %v", f.folderID, target.Name, source.Name, err)
			f.newError(target.Name, err)
			return
		}

		f.dbUpdates <- dbUpdateJob{target, dbUpdateHandleFile}
	} else {
		// We failed the rename so we have a source file that we still need to
		// get rid of. Attempt to delete it instead so that we make *some*
		// progress. The target is unhandled.

		err = osutil.InWritableDir(os.Remove, from)
		if err != nil {
			l.Infof("Puller (folder %q, file %q): delete %q after failed rename: %v", f.folderID, target.Name, source.Name, err)
			f.newError(target.Name, err)
			return
		}

		f.dbUpdates <- dbUpdateJob{source, dbUpdateDeleteFile}
	}
}
Esempio n. 16
0
func (p *rwFolder) performFinish(state *sharedPullerState) error {
	// Set the correct permission bits on the new file
	if !p.ignorePermissions(state.file) {
		if err := os.Chmod(state.tempName, os.FileMode(state.file.Flags&0777)); err != nil {
			return err
		}
	}

	// Set the correct timestamp on the new file
	t := time.Unix(state.file.Modified, 0)
	if err := os.Chtimes(state.tempName, t, t); err != nil {
		// Try using virtual mtimes instead
		info, err := os.Stat(state.tempName)
		if err != nil {
			return err
		}
		p.virtualMtimeRepo.UpdateMtime(state.file.Name, info.ModTime(), t)
	}

	if stat, err := osutil.Lstat(state.realName); err == nil {
		// There is an old file or directory already in place. We need to
		// handle that.

		switch {
		case stat.IsDir() || stat.Mode()&os.ModeSymlink != 0:
			// It's a directory or a symlink. These are not versioned or
			// archived for conflicts, only removed (which of course fails for
			// non-empty directories).

			// TODO: This is the place where we want to remove temporary files
			// and future hard ignores before attempting a directory delete.
			// Should share code with p.deletDir().

			if err = osutil.InWritableDir(osutil.Remove, state.realName); err != nil {
				return err
			}

		case p.inConflict(state.version, state.file.Version):
			// The new file has been changed in conflict with the existing one. We
			// should file it away as a conflict instead of just removing or
			// archiving. Also merge with the version vector we had, to indicate
			// we have resolved the conflict.

			state.file.Version = state.file.Version.Merge(state.version)
			if err = osutil.InWritableDir(moveForConflict, state.realName); err != nil {
				return err
			}

		case p.versioner != nil:
			// 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 err = p.versioner.Archive(state.realName); err != nil {
				return err
			}
		}
	}

	// Replace the original content with the new one
	if err := osutil.Rename(state.tempName, state.realName); err != nil {
		return err
	}

	// 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 {
			return err
		}

		// 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 {
			return err
		}
	}

	// Record the updated file in the index
	p.dbUpdates <- dbUpdateJob{state.file, dbUpdateHandleFile}
	return nil
}
Esempio n. 17
0
// handleFile queues the copies and pulls as necessary for a single new or
// changed file.
func (f *rwFolder) handleFile(file protocol.FileInfo, copyChan chan<- copyBlocksState, finisherChan chan<- *sharedPullerState) {
	curFile, hasCurFile := f.model.CurrentFolderFile(f.folderID, file.Name)

	if hasCurFile && len(curFile.Blocks) == len(file.Blocks) && scanner.BlocksEqual(curFile.Blocks, file.Blocks) {
		// We are supposed to copy the entire file, and then fetch nothing. We
		// are only updating metadata, so we don't actually *need* to make the
		// copy.
		l.Debugln(f, "taking shortcut on", file.Name)

		events.Default.Log(events.ItemStarted, map[string]string{
			"folder": f.folderID,
			"item":   file.Name,
			"type":   "file",
			"action": "metadata",
		})

		f.queue.Done(file.Name)

		err := f.shortcutFile(file)
		events.Default.Log(events.ItemFinished, map[string]interface{}{
			"folder": f.folderID,
			"item":   file.Name,
			"error":  events.Error(err),
			"type":   "file",
			"action": "metadata",
		})

		if err != nil {
			l.Infoln("Puller: shortcut:", err)
			f.newError(file.Name, err)
		} else {
			f.dbUpdates <- dbUpdateJob{file, dbUpdateShortcutFile}
		}

		return
	}

	// Figure out the absolute filenames we need once and for all
	tempName, err := rootedJoinedPath(f.dir, defTempNamer.TempName(file.Name))
	if err != nil {
		f.newError(file.Name, err)
		return
	}
	realName, err := rootedJoinedPath(f.dir, file.Name)
	if err != nil {
		f.newError(file.Name, err)
		return
	}

	if hasCurFile && !curFile.IsDirectory() && !curFile.IsSymlink() {
		// Check that the file on disk is what we expect it to be according to
		// the database. If there's a mismatch here, there might be local
		// changes that we don't know about yet and we should scan before
		// touching the file. If we can't stat the file we'll just pull it.
		if info, err := f.mtimeFS.Lstat(realName); err == nil {
			if !info.ModTime().Equal(curFile.ModTime()) || info.Size() != curFile.Size {
				l.Debugln("file modified but not rescanned; not pulling:", realName)
				// Scan() is synchronous (i.e. blocks until the scan is
				// completed and returns an error), but a scan can't happen
				// while we're in the puller routine. Request the scan in the
				// background and it'll be handled when the current pulling
				// sweep is complete. As we do retries, we'll queue the scan
				// for this file up to ten times, but the last nine of those
				// scans will be cheap...
				go f.scan.Scan([]string{file.Name})
				return
			}
		}
	}

	scanner.PopulateOffsets(file.Blocks)

	var blocks []protocol.BlockInfo
	var blocksSize int64
	var reused []int32

	// Check for an old temporary file which might have some blocks we could
	// reuse.
	tempBlocks, err := scanner.HashFile(tempName, protocol.BlockSize, nil)
	if err == nil {
		// Check for any reusable blocks in the temp file
		tempCopyBlocks, _ := scanner.BlockDiff(tempBlocks, file.Blocks)

		// block.String() returns a string unique to the block
		existingBlocks := make(map[string]struct{}, len(tempCopyBlocks))
		for _, block := range tempCopyBlocks {
			existingBlocks[block.String()] = struct{}{}
		}

		// Since the blocks are already there, we don't need to get them.
		for i, block := range file.Blocks {
			_, ok := existingBlocks[block.String()]
			if !ok {
				blocks = append(blocks, block)
				blocksSize += int64(block.Size)
			} else {
				reused = append(reused, int32(i))
			}
		}

		// The sharedpullerstate will know which flags to use when opening the
		// temp file depending if we are reusing any blocks or not.
		if len(reused) == 0 {
			// Otherwise, discard the file ourselves in order for the
			// sharedpuller not to panic when it fails to exclusively create a
			// file which already exists
			osutil.InWritableDir(os.Remove, tempName)
		}
	} else {
		// Copy the blocks, as we don't want to shuffle them on the FileInfo
		blocks = append(blocks, file.Blocks...)
		blocksSize = file.Size
	}

	if f.checkFreeSpace {
		if free, err := osutil.DiskFreeBytes(f.dir); err == nil && free < blocksSize {
			l.Warnf(`Folder "%s": insufficient disk space in %s for %s: have %.2f MiB, need %.2f MiB`, f.folderID, f.dir, file.Name, float64(free)/1024/1024, float64(blocksSize)/1024/1024)
			f.newError(file.Name, errors.New("insufficient space"))
			return
		}
	}

	// Shuffle the blocks
	for i := range blocks {
		j := rand.Intn(i + 1)
		blocks[i], blocks[j] = blocks[j], blocks[i]
	}

	events.Default.Log(events.ItemStarted, map[string]string{
		"folder": f.folderID,
		"item":   file.Name,
		"type":   "file",
		"action": "update",
	})

	s := sharedPullerState{
		file:             file,
		folder:           f.folderID,
		tempName:         tempName,
		realName:         realName,
		copyTotal:        len(blocks),
		copyNeeded:       len(blocks),
		reused:           len(reused),
		updated:          time.Now(),
		available:        reused,
		availableUpdated: time.Now(),
		ignorePerms:      f.ignorePermissions(file),
		version:          curFile.Version,
		mut:              sync.NewRWMutex(),
		sparse:           f.allowSparse,
		created:          time.Now(),
	}

	l.Debugf("%v need file %s; copy %d, reused %v", f, file.Name, len(blocks), reused)

	cs := copyBlocksState{
		sharedPullerState: &s,
		blocks:            blocks,
	}
	copyChan <- cs
}
Esempio n. 18
0
func (p *rwFolder) performFinish(state *sharedPullerState) error {
	// Set the correct permission bits on the new file
	if !p.ignorePermissions(state.file) {
		if err := os.Chmod(state.tempName, os.FileMode(state.file.Flags&0777)); err != nil {
			return err
		}
	}

	// Set the correct timestamp on the new file
	t := time.Unix(state.file.Modified, 0)
	if err := os.Chtimes(state.tempName, t, t); err != nil {
		// Try using virtual mtimes instead
		info, err := os.Stat(state.tempName)
		if err != nil {
			return err
		}
		p.virtualMtimeRepo.UpdateMtime(state.file.Name, info.ModTime(), t)
	}

	var err error
	if p.inConflict(state.version, state.file.Version) {
		// The new file has been changed in conflict with the existing one. We
		// should file it away as a conflict instead of just removing or
		// archiving. Also merge with the version vector we had, to indicate
		// we have resolved the conflict.
		state.file.Version = state.file.Version.Merge(state.version)
		err = osutil.InWritableDir(moveForConflict, state.realName)
	} else if p.versioner != nil {
		// 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.
		err = p.versioner.Archive(state.realName)
	} else {
		err = nil
	}
	if err != nil {
		return err
	}

	// If the target path is a symlink or a directory, we cannot copy
	// over it, hence remove it before proceeding.
	stat, err := osutil.Lstat(state.realName)
	if err == nil && (stat.IsDir() || stat.Mode()&os.ModeSymlink != 0) {
		osutil.InWritableDir(osutil.Remove, state.realName)
	}
	// Replace the original content with the new one
	if err = osutil.Rename(state.tempName, state.realName); err != nil {
		return err
	}

	// 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 {
			return err
		}

		// 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 {
			return err
		}
	}

	// Record the updated file in the index
	p.dbUpdates <- dbUpdateJob{state.file, dbUpdateHandleFile}
	return nil
}