$ git clone -n https://src.fedoraproject.org/rpms/wpebackend-fdo.git /var/lib/mock/f41-build-side-1-2810756-32917/root/chroot_tmpdir/scmroot/wpebackend-fdo
Cloning into '/var/lib/mock/f41-build-side-1-2810756-32917/root/chroot_tmpdir/scmroot/wpebackend-fdo'...
$ git fetch origin b10654bdb48ae8f66b087408384bd0803e507ace:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wpebackend-fdo
 * [new ref]         b10654bdb48ae8f66b087408384bd0803e507ace -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b10654b Really no longer used by any Fedora packages