When the credential dir is backed by an fs that supports ACLs we must be more careful with adjusting the 'x' bit of the directory, as any chmod() call on the dir will reset the mask entry of the ACL entirely which we don't want. Hence, do a manual set of ACL changes, that only add/drop the 'x' bit but otherwise leave the ACL as it is. This matters if we use tmpfs rather than ramfs to store credentials.
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