Luca Boccassi
9d4cb85cf5
unmerge_hierarchy() joined the persisted work_dir value directly with
--root=. An empty value therefore resolved to the root itself and was passed
to rm_rf().
Require the decoded metadata to name a non-empty, safe, normalized relative
path before constructing the removal target. Add coverage using a disposable
root with deliberately emptied metadata.
Follow-up for 9cfad502f4
System and Service Manager
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