$ git clone -n https://gitee.com/wency_cn/libgit2.git /var/lib/mock/dist-an23-build-502416-74802/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-502416-74802/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin 913884d9abe8c9cc8b0d488c6ba415d933954ba9:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/libgit2
 * [new ref]         913884d9abe8c9cc8b0d488c6ba415d933954ba9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 913884d Update code from upstream