$ git clone -n https://src.fedoraproject.org/rpms/openexr2.git /var/lib/mock/f45-build-21036-577/root/chroot_tmpdir/scmroot/openexr2
Cloning into '/var/lib/mock/f45-build-21036-577/root/chroot_tmpdir/scmroot/openexr2'...
$ git fetch origin 255c4913595db1c34452be9fc269e0cee90d0079:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openexr2
 * [new ref]         255c4913595db1c34452be9fc269e0cee90d0079 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 255c491 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild