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sync: fix management of empty directories to make it more accurate

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Before this change we used the same datastructure for managing empty
directories for both --create-empty-src-dirs in sync/copy/move and for
the --delete-empty-src-dirs flag in move.

These two uses are subtly incompatible and this change uses a separate
datastructure for both uses. This makes it more accurate and easier to
understand.
This commit is contained in:
Nick Craig-Wood 2024-04-04 17:59:56 +01:00
parent 7237b142fa
commit 2a2ec06ec1
1 changed files with 23 additions and 30 deletions
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53
fs/sync/sync.go
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@ -63,6 +63,7 @@ type syncCopyMove struct {
dstEmptyDirs map[string]fs.DirEntry // potentially empty directories
srcEmptyDirsMu sync.Mutex // protect srcEmptyDirs
srcEmptyDirs map[string]fs.DirEntry // potentially empty directories
srcMoveEmptyDirs map[string]fs.DirEntry // potentially empty directories when moving files out of them
checkerWg sync.WaitGroup // wait for checkers
toBeChecked *pipe // checkers channel
transfersWg sync.WaitGroup // wait for transfers
@ -144,6 +145,7 @@ func newSyncCopyMove(ctx context.Context, fdst, fsrc fs.Fs, deleteMode fs.Delete
dstFilesResult: make(chan error, 1),
dstEmptyDirs: make(map[string]fs.DirEntry),
srcEmptyDirs: make(map[string]fs.DirEntry),
srcMoveEmptyDirs: make(map[string]fs.DirEntry),
noTraverse: ci.NoTraverse,
noCheckDest: ci.NoCheckDest,
noUnicodeNormalization: ci.NoUnicodeNormalization,
@ -725,12 +727,21 @@ func copyEmptyDirectories(ctx context.Context, f fs.Fs, entries map[string]fs.Di
return nil
}
func (s *syncCopyMove) srcParentDirCheck(entry fs.DirEntry) {
// If we are moving files then we don't want to remove directories with files in them
// from the srcEmptyDirs as we are about to move them making the directory empty.
if s.DoMove {
return
// mark the parent of entry as not empty and if entry is a directory mark it as potentially empty.
func (s *syncCopyMove) markParentNotEmpty(entry fs.DirEntry) {
s.srcEmptyDirsMu.Lock()
defer s.srcEmptyDirsMu.Unlock()
// Mark entry as potentially empty if it is a directory
if _, isDir := entry.(fs.Directory); isDir {
s.srcEmptyDirs[entry.Remote()] = entry
// if DoMove and --delete-empty-src-dirs flag is set then record the parent but
// don't remove any as we are about to move files out of them them making the
// directory empty.
if s.DoMove && s.deleteEmptySrcDirs {
s.srcMoveEmptyDirs[entry.Remote()] = entry
}
}
// Mark its parent as not empty
parentDir := path.Dir(entry.Remote())
if parentDir == "." {
parentDir = ""
@ -1008,8 +1019,8 @@ func (s *syncCopyMove) run() error {
// Delete empty fsrc subdirectories
// if DoMove and --delete-empty-src-dirs flag is set
if s.DoMove && s.deleteEmptySrcDirs {
// delete empty subdirectories that were part of the move
s.processError(s.deleteEmptyDirectories(s.ctx, s.fsrc, s.srcEmptyDirs))
// delete potentially empty subdirectories that were part of the move
s.processError(s.deleteEmptyDirectories(s.ctx, s.fsrc, s.srcMoveEmptyDirs))
}
// Read the error out of the contexts if there is one
@ -1074,8 +1085,8 @@ func (s *syncCopyMove) DstOnly(dst fs.DirEntry) (recurse bool) {
if s.fdst.Features().CanHaveEmptyDirectories {
s.dstEmptyDirsMu.Lock()
s.dstEmptyDirs[dst.Remote()] = dst
s.logger(s.ctx, operations.MissingOnSrc, nil, dst, fs.ErrorIsDir)
s.dstEmptyDirsMu.Unlock()
s.logger(s.ctx, operations.MissingOnSrc, nil, dst, fs.ErrorIsDir)
}
return true
default:
@ -1214,12 +1225,7 @@ func (s *syncCopyMove) SrcOnly(src fs.DirEntry) (recurse bool) {
switch x := src.(type) {
case fs.Object:
s.logger(s.ctx, operations.MissingOnDst, x, nil, nil)
// If it's a copy operation,
// remove parent directory from srcEmptyDirs
// since it's not really empty
s.srcEmptyDirsMu.Lock()
s.srcParentDirCheck(src)
s.srcEmptyDirsMu.Unlock()
s.markParentNotEmpty(src)
if s.trackRenames {
// Save object to check for a rename later
@ -1247,12 +1253,8 @@ func (s *syncCopyMove) SrcOnly(src fs.DirEntry) (recurse bool) {
}
case fs.Directory:
// Do the same thing to the entire contents of the directory
// Record the directory for deletion
s.srcEmptyDirsMu.Lock()
s.srcParentDirCheck(src)
s.srcEmptyDirs[src.Remote()] = src
s.markParentNotEmpty(src)
s.logger(s.ctx, operations.MissingOnDst, src, nil, fs.ErrorIsDir)
s.srcEmptyDirsMu.Unlock()
// Create the directory and make sure the Metadata/ModTime is correct
s.markDirModified(x.Remote())
@ -1268,9 +1270,7 @@ func (s *syncCopyMove) SrcOnly(src fs.DirEntry) (recurse bool) {
func (s *syncCopyMove) Match(ctx context.Context, dst, src fs.DirEntry) (recurse bool) {
switch srcX := src.(type) {
case fs.Object:
s.srcEmptyDirsMu.Lock()
s.srcParentDirCheck(src)
s.srcEmptyDirsMu.Unlock()
s.markParentNotEmpty(src)
if s.deleteMode == fs.DeleteModeOnly {
return false
@ -1291,20 +1291,13 @@ func (s *syncCopyMove) Match(ctx context.Context, dst, src fs.DirEntry) (recurse
}
case fs.Directory:
// Do the same thing to the entire contents of the directory
s.markParentNotEmpty(src)
dstX, ok := dst.(fs.Directory)
if ok {
s.logger(s.ctx, operations.Match, src, dst, fs.ErrorIsDir)
// Create the directory and make sure the Metadata/ModTime is correct
s.copyDirMetadata(s.ctx, s.fdst, dstX, "", srcX)
// Only record matched (src & dst) empty dirs when performing move
if s.DoMove {
// Record the src directory for deletion
s.srcEmptyDirsMu.Lock()
s.srcParentDirCheck(src)
s.srcEmptyDirs[src.Remote()] = src
s.srcEmptyDirsMu.Unlock()
}
if s.ci.FixCase && !s.ci.Immutable && src.Remote() != dst.Remote() {
// Fix case for case insensitive filesystems
// Fix each dir before recursing into subdirs and files