$ git clone -n https://src.fedoraproject.org/rpms/R-presser.git /var/lib/mock/f38-build-723953-99307/root/chroot_tmpdir/scmroot/R-presser
Cloning into '/var/lib/mock/f38-build-723953-99307/root/chroot_tmpdir/scmroot/R-presser'...
$ git fetch origin 9016f5424360e9a8331630fc64abea7337b62f0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-presser
 * [new ref]         9016f5424360e9a8331630fc64abea7337b62f0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9016f54 R-maint-sig mass rebuild