$ git clone -n https://src.fedoraproject.org/rpms/gnustep-base.git /var/lib/mock/f40-build-746849-112866/root/chroot_tmpdir/scmroot/gnustep-base
Cloning into '/var/lib/mock/f40-build-746849-112866/root/chroot_tmpdir/scmroot/gnustep-base'...
$ git fetch origin 31da485473aff05864c5a36773e09b1f303c3a77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnustep-base
 * [new ref]         31da485473aff05864c5a36773e09b1f303c3a77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31da485 Release 1.29.0 | Explicit version of installed library