$ git clone -n https://src.fedoraproject.org/rpms/GitPython.git /var/lib/mock/f41-build-side-1-2749566-31004/root/chroot_tmpdir/scmroot/GitPython
Cloning into '/var/lib/mock/f41-build-side-1-2749566-31004/root/chroot_tmpdir/scmroot/GitPython'...
$ git fetch origin 551990a0c436af8af7d13a38299085aa7f998156:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GitPython
 * [new ref]         551990a0c436af8af7d13a38299085aa7f998156 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 551990a Update to 3.1.43. Fixes rhbz#2257679