$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebengine.git /var/lib/mock/f38-build-side-42-init-devel-1012245-29458/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1012245-29458/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin 2483bdc6b07d48cde98699547efc808046174160:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebengine
 * [new ref]         2483bdc6b07d48cde98699547efc808046174160 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2483bdc rebuild for libvpx