$ git clone -n https://src.fedoraproject.org/rpms/ffcall.git /var/lib/mock/f41-build-847111-163715/root/chroot_tmpdir/scmroot/ffcall
Cloning into '/var/lib/mock/f41-build-847111-163715/root/chroot_tmpdir/scmroot/ffcall'...
$ git fetch origin 0164858bda359f925ebaef156c8412c3e1ec1c09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffcall
 * [new ref]         0164858bda359f925ebaef156c8412c3e1ec1c09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0164858 Version 2.5