$ git clone -n https://gitee.com/sys0613/libdvdnav.git /var/lib/mock/dist-an8.8-build-309018-67135/root/chroot_tmpdir/scmroot/libdvdnav
Cloning into '/var/lib/mock/dist-an8.8-build-309018-67135/root/chroot_tmpdir/scmroot/libdvdnav'...
$ git fetch origin 2687dadf686c5e14406e5ab6d900c0b9bf22e80d:KOJI_FETCH_HEAD
From https://gitee.com/sys0613/libdvdnav
 * [new ref]         2687dadf686c5e14406e5ab6d900c0b9bf22e80d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2687dad spec: add doc sub package