$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebsockets.git /var/lib/mock/f40-build-772420-126410/root/chroot_tmpdir/scmroot/qt5-qtwebsockets
Cloning into '/var/lib/mock/f40-build-772420-126410/root/chroot_tmpdir/scmroot/qt5-qtwebsockets'...
$ git fetch origin 7e8d804a2df126b2884b33349b9d2c57e28ead8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebsockets
 * [new ref]         7e8d804a2df126b2884b33349b9d2c57e28ead8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e8d804 5.15.12