$ git clone -n https://src.fedoraproject.org/rpms/catch.git /var/lib/mock/f41-build-side-1-2656046-28431/root/chroot_tmpdir/scmroot/catch
Cloning into '/var/lib/mock/f41-build-side-1-2656046-28431/root/chroot_tmpdir/scmroot/catch'...
$ git fetch origin 36b6da0445f71431d130db57c76069341c155d0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/catch
 * [new ref]         36b6da0445f71431d130db57c76069341c155d0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36b6da0 Update to 3.7.1 upstream release