$ git clone -n https://gitee.com/src-opencloudos-rpms/ppp.git /var/lib/mock/dist-oc9-build-123742-73213/root/chroot_tmpdir/scmroot/ppp
Cloning into '/var/lib/mock/dist-oc9-build-123742-73213/root/chroot_tmpdir/scmroot/ppp'...
$ git fetch origin 2c797fad35b44ee0fcc1d3c8edb59af17e3fbce4:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/ppp
 * [new ref]         2c797fad35b44ee0fcc1d3c8edb59af17e3fbce4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c797fa import ppp-2.5.0-5.tl4