Subject: bug#44382: Updating the guix package triggers a full Git clone of guix.git

From: Leo Famulari <[email-masked]>
Date: Sun, 1 Nov 2020 20:39:36 -0500

I poked around a bit and found that Savannah can serve shallow clones of
random commits, but does not allow shallow *fetching*, except for
special things such as Git tags. We fetch instead of clone.