$ git clone -n https://gitee.com/src-opencloudos-rpms/imath.git /var/lib/mock/dist-oc9-build-58394-16463/root/chroot_tmpdir/scmroot/imath
Cloning into '/var/lib/mock/dist-oc9-build-58394-16463/root/chroot_tmpdir/scmroot/imath'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/imath
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 851ed7d import imath-3.1.9-3.tl4