$ git clone -n https://gitee.com/src-opencloudos-rpms/re2c.git /var/lib/mock/dist-oc9-build-51478-14595/root/chroot_tmpdir/scmroot/re2c
Cloning into '/var/lib/mock/dist-oc9-build-51478-14595/root/chroot_tmpdir/scmroot/re2c'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/re2c
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a53790 import re2c-2.2-3.tl4