$ git clone -n https://src.fedoraproject.org/rpms/schismtracker.git /var/lib/mock/f41-build-1049349-19179/root/chroot_tmpdir/scmroot/schismtracker
Cloning into '/var/lib/mock/f41-build-1049349-19179/root/chroot_tmpdir/scmroot/schismtracker'...
$ git fetch origin bbcd5a226873bf0102fe167eb822b483a5f68b2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/schismtracker
 * [new ref]         bbcd5a226873bf0102fe167eb822b483a5f68b2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbcd5a2 bump version