$ git clone -n https://src.fedoraproject.org/rpms/python-fastavro.git /var/lib/mock/f40-build-731366-103859/root/chroot_tmpdir/scmroot/python-fastavro
Cloning into '/var/lib/mock/f40-build-731366-103859/root/chroot_tmpdir/scmroot/python-fastavro'...
$ git fetch origin fab83ba63d514f13989c877e14e94106e1fd0182:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-fastavro
 * [new ref]         fab83ba63d514f13989c877e14e94106e1fd0182 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fab83ba Update to 1.8.4 (close RHBZ#2241972)