$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-IPC-System-Simple.git /var/lib/mock/dist-oc9-build-71220-47532/root/chroot_tmpdir/scmroot/perl-IPC-System-Simple
Cloning into '/var/lib/mock/dist-oc9-build-71220-47532/root/chroot_tmpdir/scmroot/perl-IPC-System-Simple'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-IPC-System-Simple
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31639f7 import perl-IPC-System-Simple-1.30-5.tl4