$ git clone -n https://gitee.com/opencloudos-stream/perl-Math-BigInt-FastCalc.git /var/lib/mock/dist-ocs23-build-22068-1041/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc
Cloning into '/var/lib/mock/dist-ocs23-build-22068-1041/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc'...
$ git fetch origin HEAD:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Math-BigInt-FastCalc
 * [new ref]                    -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7358ee5 update