$ git clone -n https://src.fedoraproject.org/rpms/schismtracker.git /var/lib/mock/f40-build-2718735-72966/root/chroot_tmpdir/scmroot/schismtracker
Cloning into '/var/lib/mock/f40-build-2718735-72966/root/chroot_tmpdir/scmroot/schismtracker'...
$ git fetch origin a7abd5abc52d1d35dbfa595516ce24851adc1ce2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/schismtracker
 * [new ref]         a7abd5abc52d1d35dbfa595516ce24851adc1ce2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7abd5a bump version