$ git clone -n https://src.fedoraproject.org/rpms/procps-ng.git /var/lib/mock/f40-build-734074-105763/root/chroot_tmpdir/scmroot/procps-ng
Cloning into '/var/lib/mock/f40-build-734074-105763/root/chroot_tmpdir/scmroot/procps-ng'...
$ git fetch origin 77c57a8c95c9d5bb8dd67e1f437d4e145dcdc97e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/procps-ng
 * [new ref]         77c57a8c95c9d5bb8dd67e1f437d4e145dcdc97e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77c57a8 Rebase to procps-ng-4.0.4