$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebsockets.git /var/lib/mock/f40-build-800430-143529/root/chroot_tmpdir/scmroot/qt5-qtwebsockets
Cloning into '/var/lib/mock/f40-build-800430-143529/root/chroot_tmpdir/scmroot/qt5-qtwebsockets'...
$ git fetch origin f6536dca4be8084e8cc6b2abb1b7937fdd0a373b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebsockets
 * [new ref]         f6536dca4be8084e8cc6b2abb1b7937fdd0a373b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6536dc 5.15.13