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union: fix union attempting to update files on a read only file system

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Before this change, when using an all create method with one of the
upstreams being read only, if there was an existing file on the read
only remote, it was impossible to update it.

This change detects that situation and creates the file on a
read/write upstream. This file will shadow the file on the read/only
upstream. If it is deleted the read only upstream file will be visible
again.

Fixes #4929
This commit is contained in:
Nick Craig-Wood
2021-01-15 12:18:28 +00:00
parent 6b9e4f939d
commit ebd9462ea6
3 changed files with 114 additions and 44 deletions
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12
backend/union/entry.go
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@@ -59,7 +59,17 @@ func (d *Directory) candidates() []upstream.Entry {
// return an error or update the object properly (rather than e.g. calling panic).
func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) error {
entries, err := o.fs.actionEntries(o.candidates()...)
if err != nil {
if err == fs.ErrorPermissionDenied {
// There are no candidates in this object which can be written to
// So attempt to create a new object instead
newO, err := o.fs.put(ctx, in, src, false, options...)
if err != nil {
return err
}
// Update current object
*o = *newO.(*Object)
return nil
} else if err != nil {
return err
}
if len(entries) == 1 {