$ git clone -n https://src.fedoraproject.org/rpms/R-foghorn.git /var/lib/mock/f40-build-2090844-50225/root/chroot_tmpdir/scmroot/R-foghorn
Cloning into '/var/lib/mock/f40-build-2090844-50225/root/chroot_tmpdir/scmroot/R-foghorn'...
$ git fetch origin ace3b0153c644611c4a95251ed9cfb62fdb65418:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-foghorn
 * [new ref]         ace3b0153c644611c4a95251ed9cfb62fdb65418 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ace3b01 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild