$ git clone -n https://src.fedoraproject.org/rpms/python-hacking.git /var/lib/mock/f45-build-39948-765/root/chroot_tmpdir/scmroot/python-hacking
Cloning into '/var/lib/mock/f45-build-39948-765/root/chroot_tmpdir/scmroot/python-hacking'...
$ git fetch origin e71af8a0680488dbbd157a3984d27551174ab1fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-hacking
 * [new ref]         e71af8a0680488dbbd157a3984d27551174ab1fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e71af8a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild