$ git clone -n https://gitee.com/src-opencloudos-rpms/re2c.git /var/lib/mock/dist-oc9-build-71892-47606/root/chroot_tmpdir/scmroot/re2c
Cloning into '/var/lib/mock/dist-oc9-build-71892-47606/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 ee28a5e import re2c-3.1-1.tl4