$ git clone -n https://src.fedoraproject.org/rpms/sweeper.git /var/lib/mock/f40-build-2191336-51450/root/chroot_tmpdir/scmroot/sweeper
Cloning into '/var/lib/mock/f40-build-2191336-51450/root/chroot_tmpdir/scmroot/sweeper'...
$ git fetch origin 63817eda0d33c68be81d3f3994fb0ceca9efcc86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sweeper
 * [new ref]         63817eda0d33c68be81d3f3994fb0ceca9efcc86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63817ed 24.01.85