$ git clone -n https://src.fedoraproject.org/rpms/python3.9.git /var/lib/mock/f40-build-797476-141353/root/chroot_tmpdir/scmroot/python3.9
Cloning into '/var/lib/mock/f40-build-797476-141353/root/chroot_tmpdir/scmroot/python3.9'...
$ git fetch origin 800c22e4844a1d08bcc9cb649e75b3ded08c6d21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python3.9
 * [new ref]         800c22e4844a1d08bcc9cb649e75b3ded08c6d21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 800c22e Fix tests for XMLPullParser with Expat 2.6.0