$ git clone -n https://src.fedoraproject.org/rpms/ghc-snap-server.git /var/lib/mock/f38-build-side-42-init-devel-1097646-30072/root/chroot_tmpdir/scmroot/ghc-snap-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1097646-30072/root/chroot_tmpdir/scmroot/ghc-snap-server'...
$ git fetch origin 11f31e8305368e711852e28f7ac88bd82e204f06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-snap-server
 * [new ref]         11f31e8305368e711852e28f7ac88bd82e204f06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11f31e8 bump release