$ git clone -n https://src.fedoraproject.org/rpms/python-compreffor.git /var/lib/mock/f39-build-2089360-50203/root/chroot_tmpdir/scmroot/python-compreffor
Cloning into '/var/lib/mock/f39-build-2089360-50203/root/chroot_tmpdir/scmroot/python-compreffor'...
$ git fetch origin ac7095cbe0f98044838c1ed79998b1df2c763b50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-compreffor
 * [new ref]         ac7095cbe0f98044838c1ed79998b1df2c763b50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac7095c Update to 0.5.5 (close RHBZ#2238147)