$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-parent.git /var/lib/mock/dist-oc9-build-59834-16463/root/chroot_tmpdir/scmroot/perl-parent
Cloning into '/var/lib/mock/dist-oc9-build-59834-16463/root/chroot_tmpdir/scmroot/perl-parent'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-parent
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26c7575 import perl-parent-0.241-2.tl4