$ git clone -n https://gitee.com/yangcheng1203/gnome-boxes.git /var/lib/mock/dist-an23-build-503172-74843/root/chroot_tmpdir/scmroot/gnome-boxes
Cloning into '/var/lib/mock/dist-an23-build-503172-74843/root/chroot_tmpdir/scmroot/gnome-boxes'...
$ git fetch origin 57b4a8a1da209b2fb336ce9f6dc6a0ad6a9497f5:KOJI_FETCH_HEAD
From https://gitee.com/yangcheng1203/gnome-boxes
 * [new ref]         57b4a8a1da209b2fb336ce9f6dc6a0ad6a9497f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57b4a8a Rebuild with webkitgtk 2.50.3