$ git clone -n https://src.fedoraproject.org/rpms/pepc.git /var/lib/mock/f41-build-side-2-python-2729002-30801/root/chroot_tmpdir/scmroot/pepc
Cloning into '/var/lib/mock/f41-build-side-2-python-2729002-30801/root/chroot_tmpdir/scmroot/pepc'...
$ git fetch origin 4767f2bea487fa80d9fb67ea7a8b6a6692d3b42f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pepc
 * [new ref]         4767f2bea487fa80d9fb67ea7a8b6a6692d3b42f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4767f2b Update to 1.5.17