$ git clone -n https://gitee.com/opencloudos-stream/ghc-dotgen.git /var/lib/mock/dist-ocs23-epol9-build-153162-9986/root/chroot_tmpdir/scmroot/ghc-dotgen
Cloning into '/var/lib/mock/dist-ocs23-epol9-build-153162-9986/root/chroot_tmpdir/scmroot/ghc-dotgen'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ghc-dotgen
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81c4d93 package init