$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebengine.git /var/lib/mock/f45-build-39615-748/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/f45-build-39615-748/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin 397e3ab4a64b2aec436e4d2bacf68082f7bade07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebengine
 * [new ref]         397e3ab4a64b2aec436e4d2bacf68082f7bade07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 397e3ab Rebuilt for FFmpeg 9