$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebengine.git /var/lib/mock/f41-build-847190-163786/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/f41-build-847190-163786/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin 02ca181ef0689f4b40d6019819c0abe4be61b070:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebengine
 * [new ref]         02ca181ef0689f4b40d6019819c0abe4be61b070 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02ca181 Rebuild (qt5)