$ git clone -n https://src.fedoraproject.org/rpms/xcowsay.git /var/lib/mock/f45-build-38684-727/root/chroot_tmpdir/scmroot/xcowsay
Cloning into '/var/lib/mock/f45-build-38684-727/root/chroot_tmpdir/scmroot/xcowsay'...
$ git fetch origin a19ba2235e68438e6c247b6aeda39cda2455934f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xcowsay
 * [new ref]         a19ba2235e68438e6c247b6aeda39cda2455934f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a19ba22 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild