$ git clone -n https://src.fedoraproject.org/rpms/R-flexiblas.git /var/lib/mock/f39-build-1982963-43346/root/chroot_tmpdir/scmroot/R-flexiblas
Cloning into '/var/lib/mock/f39-build-1982963-43346/root/chroot_tmpdir/scmroot/R-flexiblas'...
$ git fetch origin ba3ed2c55279e2a8f27a6b14af3bade18473dc43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-flexiblas
 * [new ref]         ba3ed2c55279e2a8f27a6b14af3bade18473dc43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba3ed2c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild