$ git clone -n https://src.fedoraproject.org/rpms/libchrony.git /var/lib/mock/f45-build-15979-481/root/chroot_tmpdir/scmroot/libchrony
Cloning into '/var/lib/mock/f45-build-15979-481/root/chroot_tmpdir/scmroot/libchrony'...
$ git fetch origin 1e04a0ab3b1aac2f75c2828cbd2d3a4e3b38ddd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libchrony
 * [new ref]         1e04a0ab3b1aac2f75c2828cbd2d3a4e3b38ddd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e04a0a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild