$ git clone -n https://gitee.com/src-opencloudos-rpms/libsigcplusplus20 /var/lib/mock/dist-oc9-build-64330-16490/root/chroot_tmpdir/scmroot/libsigcplusplus20
Cloning into '/var/lib/mock/dist-oc9-build-64330-16490/root/chroot_tmpdir/scmroot/libsigcplusplus20'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libsigcplusplus20
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a8bcd9 import libsigc++20-2.10.8-3.tl4