$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-Math-BigInt-FastCalc.git /var/lib/mock/dist-oc9-build-71245-47534/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc
Cloning into '/var/lib/mock/dist-oc9-build-71245-47534/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-Math-BigInt-FastCalc
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 55807c1 import perl-Math-BigInt-FastCalc-0.501.400-3.tl4