$ git clone -n https://gitee.com/src-opencloudos-rpms/libsigcplusplus30 /var/lib/mock/dist-oc9-build-64333-16490/root/chroot_tmpdir/scmroot/libsigcplusplus30
Cloning into '/var/lib/mock/dist-oc9-build-64333-16490/root/chroot_tmpdir/scmroot/libsigcplusplus30'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
fatal: couldn't find remote ref oc9
$ git reset --hard origin/oc9
fatal: ambiguous argument 'origin/oc9': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'