$ git clone -n https://src.fedoraproject.org/rpms/python-backcall.git /var/lib/mock/f45-build-29718-640/root/chroot_tmpdir/scmroot/python-backcall
Cloning into '/var/lib/mock/f45-build-29718-640/root/chroot_tmpdir/scmroot/python-backcall'...
$ git fetch origin 10ea5e20bb066f8a1000f00fe72293d08bc889ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-backcall
 * [new ref]         10ea5e20bb066f8a1000f00fe72293d08bc889ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10ea5e2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild