$ git clone -n https://src.fedoraproject.org/rpms/gambas3.git /var/lib/mock/f41-build-856815-167776/root/chroot_tmpdir/scmroot/gambas3
Cloning into '/var/lib/mock/f41-build-856815-167776/root/chroot_tmpdir/scmroot/gambas3'...
$ git fetch origin b1a5ed313fc1367bb501dbf74adf865f1d77d32c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gambas3
 * [new ref]         b1a5ed313fc1367bb501dbf74adf865f1d77d32c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1a5ed3 apply hack to build with c++20