$ git clone -n https://gitee.com/src-opencloudos-rpms/istack-commons /var/lib/mock/dist-oc8-build-57004-15199/root/chroot_tmpdir/scmroot/istack-commons
Cloning into '/var/lib/mock/dist-oc8-build-57004-15199/root/chroot_tmpdir/scmroot/istack-commons'...
$ git fetch origin oc8:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/istack-commons
 * [new branch]      oc8        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b89dbf1 import istack-commons-2.21-9.tl3.2