$ git clone -n https://src.fedoraproject.org/rpms/rpm.git /var/lib/mock/f40-build-782982-132413/root/chroot_tmpdir/scmroot/rpm
Cloning into '/var/lib/mock/f40-build-782982-132413/root/chroot_tmpdir/scmroot/rpm'...
$ git fetch origin 9663c4f3ab64c6f306041ccc1856a75a7ea304a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpm
 * [new ref]         9663c4f3ab64c6f306041ccc1856a75a7ea304a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9663c4f Update to 4.19.1.1 (https://rpm.org/wiki/Releases/4.19.1.1)