$ git clone -n https://src.fedoraproject.org/rpms/rpm.git /var/lib/mock/f41-build-side-2-python-2655708-28352/root/chroot_tmpdir/scmroot/rpm
Cloning into '/var/lib/mock/f41-build-side-2-python-2655708-28352/root/chroot_tmpdir/scmroot/rpm'...
$ git fetch origin 4edeaf9d3be8925a0f1bf669c900f0bcc2be5f49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpm
 * [new ref]         4edeaf9d3be8925a0f1bf669c900f0bcc2be5f49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4edeaf9 Rebase to 4.20 rc2