$ git clone -n https://src.fedoraproject.org/rpms/make.git /var/lib/mock/f40-build-2228340-53078/root/chroot_tmpdir/scmroot/make
Cloning into '/var/lib/mock/f40-build-2228340-53078/root/chroot_tmpdir/scmroot/make'...
$ git fetch origin 12d47b0af7ddeb7820b2ae67e781a5f1f1ea962e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/make
 * [new ref]         12d47b0af7ddeb7820b2ae67e781a5f1f1ea962e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12d47b0 Use guile-3.0