$ git clone -n https://gitee.com/src-opencloudos-rpms/gcc.git /var/lib/mock/dist-oc8-build-100398-64526/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/dist-oc8-build-100398-64526/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin 2caf081afbb4f862a0af1d6cf1a114c1915c8a9e:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/gcc
 * [new ref]         2caf081afbb4f862a0af1d6cf1a114c1915c8a9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2caf081 import gcc-8.5.0-23.tl3