$ git clone -n https://src.fedoraproject.org/rpms/policycoreutils.git /var/lib/mock/f41-build-813623-148736/root/chroot_tmpdir/scmroot/policycoreutils
Cloning into '/var/lib/mock/f41-build-813623-148736/root/chroot_tmpdir/scmroot/policycoreutils'...
$ git fetch origin 853954a187f8d6a4038c180b9bcd679cae8f9cd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/policycoreutils
 * [new ref]         853954a187f8d6a4038c180b9bcd679cae8f9cd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 853954a Move changelog to changelog and use %autochangelog