$ git clone -n https://gitee.com/src-anolis-os/sac.git /var/lib/mock/dist-an8.8-build-290000-64968/root/chroot_tmpdir/scmroot/sac
Cloning into '/var/lib/mock/dist-an8.8-build-290000-64968/root/chroot_tmpdir/scmroot/sac'...
$ git fetch origin a8:KOJI_FETCH_HEAD
From https://gitee.com/src-anolis-os/sac
 * [new branch]      a8         -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5bf958 update to sac-1.3-30.el8.src.rpm