$ git clone -n https://src.fedoraproject.org/rpms/python-aaargh.git /var/lib/mock/f45-build-29315-637/root/chroot_tmpdir/scmroot/python-aaargh
Cloning into '/var/lib/mock/f45-build-29315-637/root/chroot_tmpdir/scmroot/python-aaargh'...
$ git fetch origin 5ce71c87b3251afd8ea4bae565f638a67e39c812:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-aaargh
 * [new ref]         5ce71c87b3251afd8ea4bae565f638a67e39c812 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ce71c8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild