$ git clone -n https://src.fedoraproject.org/rpms/gpx-viewer.git /var/lib/mock/f45-build-12963-444/root/chroot_tmpdir/scmroot/gpx-viewer
Cloning into '/var/lib/mock/f45-build-12963-444/root/chroot_tmpdir/scmroot/gpx-viewer'...
$ git fetch origin bbaa13cf01323fcd11d7ce6209be555b14576399:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpx-viewer
 * [new ref]         bbaa13cf01323fcd11d7ce6209be555b14576399 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbaa13c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild