func unmarshalTrunc(bs []byte, truncate bool) (FileIntf, error) {
if truncate {
var tf FileInfoTruncated
err := tf.UnmarshalXDR(bs)
return tf, err
}
var tf protocol.FileInfo
err := tf.UnmarshalXDR(bs)
return tf, err
}
// shortcutSymlink changes the symlinks type if necessary.
func (p *rwFolder) shortcutSymlink(file protocol.FileInfo) (err error) {
tt := symlinks.TargetFile
if file.IsDirectory() {
tt = symlinks.TargetDirectory
}
err = symlinks.ChangeType(filepath.Join(p.dir, file.Name), tt)
if err != nil {
l.Infof("Puller (folder %q, file %q): symlink shortcut: %v", p.folder, file.Name, err)
p.newError(file.Name, err)
}
return
}
func (t readWriteTransaction) insertFile(folder, device []byte, file protocol.FileInfo) int64 {
l.Debugf("insert; folder=%q device=%v %v", folder, protocol.DeviceIDFromBytes(device), file)
if file.LocalVersion == 0 {
file.LocalVersion = clock(0)
}
name := []byte(file.Name)
nk := t.db.deviceKey(folder, device, name)
t.Put(nk, file.MustMarshalXDR())
return file.LocalVersion
}
func getFile(db dbReader, key []byte) (protocol.FileInfo, bool) {
bs, err := db.Get(key, nil)
if err == leveldb.ErrNotFound {
return protocol.FileInfo{}, false
}
if err != nil {
panic(err)
}
var f protocol.FileInfo
err = f.UnmarshalXDR(bs)
if err != nil {
panic(err)
}
return f, true
}
// shortcutFile sets file mode and modification time, when that's the only
// thing that has changed.
func (p *rwFolder) shortcutFile(file protocol.FileInfo) error {
realName := filepath.Join(p.dir, file.Name)
if !p.ignorePermissions(file) {
if err := os.Chmod(realName, os.FileMode(file.Flags&0777)); err != nil {
l.Infof("Puller (folder %q, file %q): shortcut: chmod: %v", p.folder, file.Name, err)
p.newError(file.Name, err)
return err
}
}
t := time.Unix(file.Modified, 0)
if err := os.Chtimes(realName, t, t); err != nil {
// Try using virtual mtimes
info, err := os.Stat(realName)
if err != nil {
l.Infof("Puller (folder %q, file %q): shortcut: unable to stat file: %v", p.folder, file.Name, err)
p.newError(file.Name, err)
return err
}
p.virtualMtimeRepo.UpdateMtime(file.Name, info.ModTime(), t)
}
// This may have been a conflict. We should merge the version vectors so
// that our clock doesn't move backwards.
if cur, ok := p.model.CurrentFolderFile(p.folder, file.Name); ok {
file.Version = file.Version.Merge(cur.Version)
}
return nil
}
func dump(ldb *leveldb.DB) {
it := ldb.NewIterator(nil, nil)
var dev protocol.DeviceID
for it.Next() {
key := it.Key()
switch key[0] {
case db.KeyTypeDevice:
folder := nulString(key[1 : 1+64])
devBytes := key[1+64 : 1+64+32]
name := nulString(key[1+64+32:])
copy(dev[:], devBytes)
fmt.Printf("[device] F:%q N:%q D:%v\n", folder, name, dev)
var f protocol.FileInfo
err := f.UnmarshalXDR(it.Value())
if err != nil {
log.Fatal(err)
}
fmt.Printf(" N:%q\n F:%#o\n M:%d\n V:%v\n S:%d\n B:%d\n", f.Name, f.Flags, f.Modified, f.Version, f.Size(), len(f.Blocks))
case db.KeyTypeGlobal:
folder := nulString(key[1 : 1+64])
name := nulString(key[1+64:])
fmt.Printf("[global] F:%q N:%q V:%x\n", folder, name, it.Value())
case db.KeyTypeBlock:
folder := nulString(key[1 : 1+64])
hash := key[1+64 : 1+64+32]
name := nulString(key[1+64+32:])
fmt.Printf("[block] F:%q H:%x N:%q I:%d\n", folder, hash, name, binary.BigEndian.Uint32(it.Value()))
case db.KeyTypeDeviceStatistic:
fmt.Printf("[dstat]\n %x\n %x\n", it.Key(), it.Value())
case db.KeyTypeFolderStatistic:
fmt.Printf("[fstat]\n %x\n %x\n", it.Key(), it.Value())
case db.KeyTypeVirtualMtime:
fmt.Printf("[mtime]\n %x\n %x\n", it.Key(), it.Value())
default:
fmt.Printf("[???]\n %x\n %x\n", it.Key(), it.Value())
}
}
}
func SymlinkTypeEqual(disk symlinks.TargetType, f protocol.FileInfo) bool {
// If the target is missing, Unix never knows what type of symlink it is
// and Windows always knows even if there is no target. Which means that
// without this special check a Unix node would be fighting with a Windows
// node about whether or not the target is known. Basically, if you don't
// know and someone else knows, just accept it. The fact that you don't
// know means you are on Unix, and on Unix you don't really care what the
// target type is. The moment you do know, and if something doesn't match,
// that will propagate through the cluster.
switch disk {
case symlinks.TargetUnknown:
return true
case symlinks.TargetDirectory:
return f.IsDirectory() && f.Flags&protocol.FlagSymlinkMissingTarget == 0
case symlinks.TargetFile:
return !f.IsDirectory() && f.Flags&protocol.FlagSymlinkMissingTarget == 0
}
panic("unknown symlink TargetType")
}
// deleteFile attempts to delete the given file
func (p *rwFolder) deleteFile(file protocol.FileInfo) {
var err error
events.Default.Log(events.ItemStarted, map[string]string{
"folder": p.folder,
"item": file.Name,
"type": "file",
"action": "delete",
})
defer func() {
events.Default.Log(events.ItemFinished, map[string]interface{}{
"folder": p.folder,
"item": file.Name,
"error": events.Error(err),
"type": "file",
"action": "delete",
})
}()
realName := filepath.Join(p.dir, file.Name)
cur, ok := p.model.CurrentFolderFile(p.folder, file.Name)
if ok && p.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(p.moveForConflict, realName)
} else if p.versioner != nil {
err = osutil.InWritableDir(p.versioner.Archive, realName)
} else {
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, dbUpdateDeleteFile}
} else if _, serr := os.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.
p.dbUpdates <- dbUpdateJob{file, dbUpdateDeleteFile}
} else {
l.Infof("Puller (folder %q, file %q): delete: %v", p.folder, file.Name, err)
p.newError(file.Name, err)
}
}
// 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, hasCurFile := p.model.CurrentFolderFile(p.folder, 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(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
}
// 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)
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 := osutil.Lstat(realName); err == nil {
mtime := p.virtualMtimeRepo.GetMtime(file.Name, info.ModTime())
if mtime.Unix() != curFile.Modified || 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 p.Scan([]string{file.Name})
return
}
}
}
scanner.PopulateOffsets(file.Blocks)
reused := 0
var blocks []protocol.BlockInfo
var blocksSize int64
// 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)
blocksSize += int64(block.Size)
}
}
// 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
blocksSize = file.Size()
}
if p.checkFreeSpace {
if free, err := osutil.DiskFreeBytes(p.dir); err == nil && free < blocksSize {
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(blocksSize)/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",
})
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(),
sparse: p.allowSparse,
}
l.Debugf("%v need file %s; copy %d, reused %v", p, file.Name, len(blocks), reused)
cs := copyBlocksState{
sharedPullerState: &s,
blocks: blocks,
}
copyChan <- cs
}
// updateGlobal adds this device+version to the version list for the given
// file. If the device is already present in the list, the version is updated.
// If the file does not have an entry in the global list, it is created.
func (t readWriteTransaction) updateGlobal(folder, device []byte, file protocol.FileInfo, globalSize *sizeTracker) bool {
l.Debugf("update global; folder=%q device=%v file=%q version=%d", folder, protocol.DeviceIDFromBytes(device), file.Name, file.Version)
name := []byte(file.Name)
gk := t.db.globalKey(folder, name)
svl, err := t.Get(gk, nil)
if err != nil && err != leveldb.ErrNotFound {
panic(err)
}
var fl versionList
var oldFile protocol.FileInfo
var hasOldFile bool
// Remove the device from the current version list
if svl != nil {
err = fl.UnmarshalXDR(svl)
if err != nil {
panic(err)
}
for i := range fl.versions {
if bytes.Compare(fl.versions[i].device, device) == 0 {
if fl.versions[i].version.Equal(file.Version) {
// No need to do anything
return false
}
if i == 0 {
// Keep the current newest file around so we can subtract it from
// the globalSize if we replace it.
oldFile, hasOldFile = t.getFile(folder, fl.versions[0].device, name)
}
fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
break
}
}
}
nv := fileVersion{
device: device,
version: file.Version,
}
insertedAt := -1
// Find a position in the list to insert this file. The file at the front
// of the list is the newer, the "global".
for i := range fl.versions {
switch fl.versions[i].version.Compare(file.Version) {
case protocol.Equal, protocol.Lesser:
// The version at this point in the list is equal to or lesser
// ("older") than us. We insert ourselves in front of it.
fl.versions = insertVersion(fl.versions, i, nv)
insertedAt = i
goto done
case protocol.ConcurrentLesser, protocol.ConcurrentGreater:
// The version at this point is in conflict with us. We must pull
// the actual file metadata to determine who wins. If we win, we
// insert ourselves in front of the loser here. (The "Lesser" and
// "Greater" in the condition above is just based on the device
// IDs in the version vector, which is not the only thing we use
// to determine the winner.)
of, ok := t.getFile(folder, fl.versions[i].device, name)
if !ok {
panic("file referenced in version list does not exist")
}
if file.WinsConflict(of) {
fl.versions = insertVersion(fl.versions, i, nv)
insertedAt = i
goto done
}
}
}
// We didn't find a position for an insert above, so append to the end.
fl.versions = append(fl.versions, nv)
insertedAt = len(fl.versions) - 1
done:
if insertedAt == 0 {
// We just inserted a new newest version. Fixup the global size
// calculation.
if !file.Version.Equal(oldFile.Version) {
globalSize.addFile(file)
if hasOldFile {
// We have the old file that was removed at the head of the list.
globalSize.removeFile(oldFile)
} else if len(fl.versions) > 1 {
// The previous newest version is now at index 1, grab it from there.
oldFile, ok := t.getFile(folder, fl.versions[1].device, name)
if !ok {
panic("file referenced in version list does not exist")
}
globalSize.removeFile(oldFile)
}
}
}
l.Debugf("new global after update: %v", fl)
t.Put(gk, fl.MustMarshalXDR())
return true
}