$ git clone -n https://src.fedoraproject.org/rpms/greyhounds.git /var/lib/mock/f40-build-802449-144014/root/chroot_tmpdir/scmroot/greyhounds
Cloning into '/var/lib/mock/f40-build-802449-144014/root/chroot_tmpdir/scmroot/greyhounds'...
$ git fetch origin 28da6459a85009266a2cb9e998fae4cc3242d872:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/greyhounds
 * [new ref]         28da6459a85009266a2cb9e998fae4cc3242d872 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28da645 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild