$ git clone -n https://gitee.com/opencloudos-stream/ghc-mmap.git /var/lib/mock/dist-ocs23-epol9-build-160314-10062/root/chroot_tmpdir/scmroot/ghc-mmap
Cloning into '/var/lib/mock/dist-ocs23-epol9-build-160314-10062/root/chroot_tmpdir/scmroot/ghc-mmap'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ghc-mmap
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d06f04 package init