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union: make server side copies possible from outside the union

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Before this change, only server side copies within the union would be
permitted.

This change allows server side copies from outside the union to
happen, delegating the checking to the individual upstream backend.

The same change should be made to Move and DirMove

Fixes #6287
This commit is contained in:
Nick Craig-Wood 2022-09-12 13:25:15 +01:00
parent 404059fd95
commit 4488bc0cd7
1 changed files with 11 additions and 11 deletions
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20
backend/union/union.go
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@ -222,19 +222,19 @@ func (f *Fs) Purge(ctx context.Context, dir string) error {
//
// If it isn't possible then return fs.ErrorCantCopy
func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object, error) {
srcObj, ok := src.(*Object)
if !ok {
fs.Debugf(src, "Can't copy - not same remote type")
return nil, fs.ErrorCantCopy
}
var srcFs fs.Info
if srcObj, ok := src.(*Object); ok {
// Have a union object - unwrap
o := srcObj.UnWrapUpstream()
su := o.UpstreamFs()
if su.Features().Copy == nil {
return nil, fs.ErrorCantCopy
srcFs = o.UpstreamFs()
src = o
} else {
// Have a non union object - it might be compatible with a union member
srcFs = src.Fs()
}
var du *upstream.Fs
for _, u := range f.upstreams {
if operations.Same(u.RootFs, su.RootFs) {
if u.Features().Copy != nil && operations.Same(u.RootFs, srcFs) {
du = u
}
}
@ -244,7 +244,7 @@ func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object,
if !du.IsCreatable() {
return nil, fs.ErrorPermissionDenied
}
co, err := du.Features().Copy(ctx, o, remote)
co, err := du.Features().Copy(ctx, src, remote)
if err != nil || co == nil {
return nil, err
}