$ git clone -n https://src.fedoraproject.org/rpms/dex-autostart.git /var/lib/mock/f45-build-7446-364/root/chroot_tmpdir/scmroot/dex-autostart
Cloning into '/var/lib/mock/f45-build-7446-364/root/chroot_tmpdir/scmroot/dex-autostart'...
$ git fetch origin c3c3389a2481712f4ac2c45ac8cae9a031a2ebab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dex-autostart
 * [new ref]         c3c3389a2481712f4ac2c45ac8cae9a031a2ebab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3c3389 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild