$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-Math-BigRat.git /var/lib/mock/dist-oc9-build-61388-16463/root/chroot_tmpdir/scmroot/perl-Math-BigRat
Cloning into '/var/lib/mock/dist-oc9-build-61388-16463/root/chroot_tmpdir/scmroot/perl-Math-BigRat'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-Math-BigRat
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c764d34 import perl-Math-BigRat-0.2624-5.tl4