$ git clone -n https://src.fedoraproject.org/rpms/GitPython.git /var/lib/mock/f39-build-1453621-32890/root/chroot_tmpdir/scmroot/GitPython
Cloning into '/var/lib/mock/f39-build-1453621-32890/root/chroot_tmpdir/scmroot/GitPython'...
$ git fetch origin 53de6306884b618583e6342589bfae85c17b7fb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GitPython
 * [new ref]         53de6306884b618583e6342589bfae85c17b7fb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53de630 - New upstream release 3.1.32