When ingestImages.py is run, a series of filesystem links are created pointing from the data repo to raw image files. If the raw image files are subsequently compressed (e.g., gzipped), then the links no longer point to the data. This is despite the fact that the Butler would perfectly happy to read the gzipped files.
This ticket is to extend the Butler search routine so that if a link pointing to foo.fits can not be resolved to a file, then foo.fits.gz is tried as a fall back. Presumably other common compression extensions could also be checked (foo.fits.bz2, foo.fz) (though my use case at the moment is just .gz).
Also, if someone with more experience in this area wants to come and clean up my very non-expert description in this ticket, please do!