$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebengine.git /var/lib/mock/f41-build-811759-147521/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/f41-build-811759-147521/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin b21761eee842685c0dba0e69651c51fad267957e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebengine
 * [new ref]         b21761eee842685c0dba0e69651c51fad267957e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b21761e Fix remaining %patchN usage