// 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}
}
}
// 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}
}
}
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
}
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 osutil.TryRename(path, newPath)
}
// 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 := osutil.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")
}