$ git clone -n https://src.fedoraproject.org/rpms/python-arrow.git /var/lib/mock/f45-build-29456-639/root/chroot_tmpdir/scmroot/python-arrow
Cloning into '/var/lib/mock/f45-build-29456-639/root/chroot_tmpdir/scmroot/python-arrow'...
$ git fetch origin 97ddabd557d7a8464fe7b73e443175ca04963dd2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-arrow
 * [new ref]         97ddabd557d7a8464fe7b73e443175ca04963dd2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97ddabd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild