$ git clone -n https://gitee.com/src-opencloudos-rpms/gcc.git /var/lib/mock/dist-oc8-build-126284-75924/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/dist-oc8-build-126284-75924/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin 40d28a90837f636887a6ba7e5c476bedde9af60e:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/gcc
 * [new ref]         40d28a90837f636887a6ba7e5c476bedde9af60e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40d28a9 import gcc-8.5.0-26.tl3.ap.2