$ git clone -n https://gitee.com/opencloudos-stream/ghc-constraints.git /var/lib/mock/dist-oc9-epol-build-221092-80934/root/chroot_tmpdir/scmroot/ghc-constraints
Cloning into '/var/lib/mock/dist-oc9-epol-build-221092-80934/root/chroot_tmpdir/scmroot/ghc-constraints'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ghc-constraints
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26bbabe !3 Rebuilt Merge pull request !3 from epol/master