$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-Math-BigInt.git /var/lib/mock/dist-oc9-build-43708-14591/root/chroot_tmpdir/scmroot/perl-Math-BigInt
Cloning into '/var/lib/mock/dist-oc9-build-43708-14591/root/chroot_tmpdir/scmroot/perl-Math-BigInt'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-Math-BigInt
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20319e0 import perl-Math-BigInt-1.9998.37-3.tl4