$ git clone -n https://gitee.com/fundawang/libgit2.git /var/lib/mock/dist-an23-build-286411-64832/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-286411-64832/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin f3cd66e2660d9229ae4b743d7c8311aab03a3d99:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/libgit2
 * [new ref]         f3cd66e2660d9229ae4b743d7c8311aab03a3d99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3cd66e 1.6.4