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252562d00a
Before this change, operations.CopyDirMetadata would fail with: `internal error: expecting directory string from combine root '' to have SetMetadata method: optional feature not implemented` if the dst was the root directory of a combine upstream. This is because combine was returning a *fs.Dir, which does not satisfy the fs.SetMetadataer interface. While it is true that combine cannot set metadata on the root of an upstream (see also #7652), this should not be considered an error that causes sync to do high-level retries, abort without doing deletes, etc. This change addresses the issue by creating a new type of DirWrapper that is allowed to fail silently, for exceptional cases such as this where certain special directories have more limited abilities than what the Fs usually supports. It is possible that other similar wrapping backends (Union?) may need this same fix.
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
package fs
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import (
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"context"
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"time"
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)
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// DirWrapper wraps a Directory object so the Remote can be overridden
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type DirWrapper struct {
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Directory // Directory we are wrapping
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remote string // name of the directory
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failSilently bool // if set, ErrorNotImplemented should not be considered an error for this directory
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}
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// NewDirWrapper creates a wrapper for a directory object
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//
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// This passes through optional methods and should be used for
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// wrapping backends to wrap native directories.
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func NewDirWrapper(remote string, d Directory) *DirWrapper {
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return &DirWrapper{
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Directory: d,
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remote: remote,
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}
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}
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// NewLimitedDirWrapper creates a DirWrapper that should fail silently instead of erroring for ErrorNotImplemented.
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//
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// Intended for exceptional dirs lacking abilities that the Fs otherwise usually supports
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// (ex. a Combine root which can't set metadata/modtime, regardless of support by wrapped backend)
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func NewLimitedDirWrapper(remote string, d Directory) *DirWrapper {
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dw := NewDirWrapper(remote, d)
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dw.failSilently = true
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return dw
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}
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// String returns the name
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func (d *DirWrapper) String() string {
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return d.remote
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}
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// Remote returns the remote path
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func (d *DirWrapper) Remote() string {
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return d.remote
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}
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// SetRemote sets the remote
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func (d *DirWrapper) SetRemote(remote string) *DirWrapper {
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d.remote = remote
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return d
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}
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// Metadata returns metadata for an DirEntry
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//
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// It should return nil if there is no Metadata
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func (d *DirWrapper) Metadata(ctx context.Context) (Metadata, error) {
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do, ok := d.Directory.(Metadataer)
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if !ok {
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return nil, nil
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}
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return do.Metadata(ctx)
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}
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// SetMetadata sets metadata for an DirEntry
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//
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// It should return fs.ErrorNotImplemented if it can't set metadata
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func (d *DirWrapper) SetMetadata(ctx context.Context, metadata Metadata) error {
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do, ok := d.Directory.(SetMetadataer)
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if !ok {
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if d.failSilently {
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Debugf(d, "Can't SetMetadata for this directory (%T from %v) -- skipping", d.Directory, d.Fs())
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return nil
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}
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return ErrorNotImplemented
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}
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return do.SetMetadata(ctx, metadata)
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}
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// SetModTime sets the metadata on the DirEntry to set the modification date
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//
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// If there is any other metadata it does not overwrite it.
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func (d *DirWrapper) SetModTime(ctx context.Context, t time.Time) error {
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do, ok := d.Directory.(SetModTimer)
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if !ok {
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if d.failSilently {
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Debugf(d, "Can't SetModTime for this directory (%T from %v) -- skipping", d.Directory, d.Fs())
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return nil
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}
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return ErrorNotImplemented
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}
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return do.SetModTime(ctx, t)
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}
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// Check interfaces
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var (
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_ DirEntry = (*DirWrapper)(nil)
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_ Directory = (*DirWrapper)(nil)
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_ FullDirectory = (*DirWrapper)(nil)
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)
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