$ git clone -n https://src.fedoraproject.org/rpms/python3.8.git /var/lib/mock/f40-build-803845-144367/root/chroot_tmpdir/scmroot/python3.8
Cloning into '/var/lib/mock/f40-build-803845-144367/root/chroot_tmpdir/scmroot/python3.8'...
$ git fetch origin ffe47d417d2ee6f2795afb9fe27607fda5d10d7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python3.8
 * [new ref]         ffe47d417d2ee6f2795afb9fe27607fda5d10d7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffe47d4 Fix tests for XMLPullParser with Expat 2.6.0