$ git clone -n https://gitee.com/fundawang/libgit2.git /var/lib/mock/dist-an23-build-286407-64832/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-286407-64832/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin 568da048c0598153dd43409379d226d162c85630:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/libgit2
 * [new ref]         568da048c0598153dd43409379d226d162c85630 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 568da04 1.6.4