$ git clone -n https://gitee.com/mgb01105731/qt5-qtwebengine.git /var/lib/mock/dist-an23-dde-build-427751-73007/root/chroot_tmpdir/scmroot/qt5-qtwebengine
Cloning into '/var/lib/mock/dist-an23-dde-build-427751-73007/root/chroot_tmpdir/scmroot/qt5-qtwebengine'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/qt5-qtwebengine
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 205f4ae rebuild with libvpx