$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-polenta.git /var/lib/mock/f39-build-1506906-35213/root/chroot_tmpdir/scmroot/gap-pkg-polenta
Cloning into '/var/lib/mock/f39-build-1506906-35213/root/chroot_tmpdir/scmroot/gap-pkg-polenta'...
$ git fetch origin b869932203dcac481e77746eb38c9d5a1189f823:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-polenta
 * [new ref]         b869932203dcac481e77746eb38c9d5a1189f823 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b869932 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild