Extend --strip test to expose a failure#4
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I noticed some oddities with incremental backups where --strip or --strip-path were involved with 'bup save'. This change extends the 'strip' test by doing two gratuitous index/save cycles after the initial save, which ends up with the latest version of the backup being empty and thus exposes a bug.
It seems to me that the problem is somewhere around lines 234--248 of cmd/save-cmd.py, where after mangling the directory using --strip, --strip-path or --graft the original 'ent' is used to validate trees, but my understanding of that part of the code isn't sufficient to allow me a quick fix.