$ git clone -n https://src.fedoraproject.org/rpms/python-comm.git /var/lib/mock/f45-build-30084-642/root/chroot_tmpdir/scmroot/python-comm
Cloning into '/var/lib/mock/f45-build-30084-642/root/chroot_tmpdir/scmroot/python-comm'...
$ git fetch origin b97d07ef4aa1d3fb3cecc5194c537a3c48ba7c06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-comm
 * [new ref]         b97d07ef4aa1d3fb3cecc5194c537a3c48ba7c06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b97d07e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild