$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebengine.git /var/lib/mock/f39-build-1512202-35560/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/f39-build-1512202-35560/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin 7b776a41de3d003db171dfda021175b659cccc07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebengine
 * [new ref]         7b776a41de3d003db171dfda021175b659cccc07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b776a4 Backport upstream patch to fix assembly with binutils 2.41