$ git clone -n https://src.fedoraproject.org/rpms/R-digest.git /var/lib/mock/f40-build-2032095-47668/root/chroot_tmpdir/scmroot/R-digest
Cloning into '/var/lib/mock/f40-build-2032095-47668/root/chroot_tmpdir/scmroot/R-digest'...
$ git fetch origin 747d976e3b15a2d25dc360965b5d7be799b10ecc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-digest
 * [new ref]         747d976e3b15a2d25dc360965b5d7be799b10ecc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 747d976 Update to 0.6.33