$ git clone -n https://gitee.com/src-opencloudos-rpms/libtar.git /var/lib/mock/dist-oc9-build-125785-75351/root/chroot_tmpdir/scmroot/libtar
Cloning into '/var/lib/mock/dist-oc9-build-125785-75351/root/chroot_tmpdir/scmroot/libtar'...
$ git fetch origin d477e7f59e72d828b5827be9feb432c7a36e17a5:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libtar
 * [new ref]         d477e7f59e72d828b5827be9feb432c7a36e17a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d477e7f import libtar-1.2.20-7.tl4