https://bugzilla.redhat.com/show_bug.cgi?id=1198342



--- Comment #31 from Michael Schwendt (Fedora Packager Sponsors Group) 
<[email protected]> ---
Reproducibility/comparability.

A snapshot Source URL giving 404 Not Found is no better than a tarball created
by the packager. It may contain too many changes compared with the last/current
official release.

 => It may get difficult to compare its contents with upstream sources, unless
there is documentation about how to recreate the tarball.

 => It may get difficult to check the tarball contents for trojans (e.g.), if
you don't know how to recreate the tarball from an uncompromised source code
management system.


> An upstream project could delete their old major release tarballs monthly;

Or become the victim of a break-in, not knowing whether any tarball releases
and the SCM contents have been modified. That has happened before. Tarball
checksums and copies found in a distribution's package collection then may be
helpful. The checkout date of a snapshot (which may differ a lot from an RPM
%changelog date) then can be helpful, too. Comparing the checkout dates of two
packages also is much more readable than comparing e.g. "git35" and "git36".

It's good that we've talked about it.

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