$ git clone -n https://src.fedoraproject.org/rpms/python-libcst.git /var/lib/mock/f40-build-2555157-62026/root/chroot_tmpdir/scmroot/python-libcst
Cloning into '/var/lib/mock/f40-build-2555157-62026/root/chroot_tmpdir/scmroot/python-libcst'...
$ git fetch origin a2a169f65c30573309757b14225ec59ce73204e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-libcst
 * [new ref]         a2a169f65c30573309757b14225ec59ce73204e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2a169f Rebuild with tests enabled