uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/beam-modules/mix-release.nix

@@ -0,0 +1,125 @@
+{ stdenv, lib, elixir, erlang, findutils, hex, rebar, rebar3, fetchMixDeps, makeWrapper, git, ripgrep }@inputs:
+
+{ pname
+, version
+, src
+, nativeBuildInputs ? [ ]
+, buildInputs ? [ ]
+, meta ? { }
+, enableDebugInfo ? false
+, mixEnv ? "prod"
+, compileFlags ? [ ]
+  # mix fixed output derivation dependencies
+, mixFodDeps ? null
+  # mix dependencies generated by mix2nix
+  # this assumes each dependency is built by buildMix or buildRebar3
+  # each dependency needs to have a setup hook to add the lib path to $ERL_LIBS
+  # this is how mix will find dependencies
+, mixNixDeps ? { }
+, elixir ? inputs.elixir
+, hex ? inputs.hex.override { inherit elixir; }
+, ...
+}@attrs:
+let
+  # remove non standard attributes that cannot be coerced to strings
+  overridable = builtins.removeAttrs attrs [ "compileFlags" "mixNixDeps" ];
+in
+assert mixNixDeps != { } -> mixFodDeps == null;
+stdenv.mkDerivation (overridable // {
+  # rg is used as a better grep to search for erlang references in the final release
+  nativeBuildInputs = nativeBuildInputs ++ [ erlang hex elixir makeWrapper git ripgrep ];
+  buildInputs = buildInputs ++ builtins.attrValues mixNixDeps;
+
+  MIX_ENV = mixEnv;
+  MIX_DEBUG = if enableDebugInfo then 1 else 0;
+  HEX_OFFLINE = 1;
+  DEBUG = if enableDebugInfo then 1 else 0; # for Rebar3 compilation
+  # the api with `mix local.rebar rebar path` makes a copy of the binary
+  # some older dependencies still use rebar
+  MIX_REBAR = "${rebar}/bin/rebar";
+  MIX_REBAR3 = "${rebar3}/bin/rebar3";
+
+  postUnpack = ''
+    export HEX_HOME="$TEMPDIR/hex"
+    export MIX_HOME="$TEMPDIR/mix"
+
+    # Rebar
+    export REBAR_GLOBAL_CONFIG_DIR="$TEMPDIR/rebar3"
+    export REBAR_CACHE_DIR="$TEMPDIR/rebar3.cache"
+
+    ${lib.optionalString (mixFodDeps != null) ''
+      # compilation of the dependencies will require
+      # that the dependency path is writable
+      # thus a copy to the TEMPDIR is inevitable here
+      export MIX_DEPS_PATH="$TEMPDIR/deps"
+      cp --no-preserve=mode -R "${mixFodDeps}" "$MIX_DEPS_PATH"
+    ''
+    }
+
+  '' + (attrs.postUnpack or "");
+
+  configurePhase = attrs.configurePhase or ''
+    runHook preConfigure
+
+    ${./mix-configure-hook.sh}
+    # this is needed for projects that have a specific compile step
+    # the dependency needs to be compiled in order for the task
+    # to be available
+    # Phoenix projects for example will need compile.phoenix
+    mix deps.compile --no-deps-check --skip-umbrella-children
+
+    runHook postConfigure
+  '';
+
+  buildPhase = attrs.buildPhase or ''
+    runHook preBuild
+
+    mix compile --no-deps-check ${lib.concatStringsSep " " compileFlags}
+
+    runHook postBuild
+  '';
+
+
+  installPhase = attrs.installPhase or ''
+    runHook preInstall
+
+    mix release --no-deps-check --path "$out"
+
+    runHook postInstall
+  '';
+
+  # Stripping of the binary is intentional
+  # even though it does not affect beam files
+  # it is necessary for NIFs binaries
+  postFixup = ''
+    if [ -e "$out/bin/${pname}.bat" ]; then # absent in special cases, i.e. elixir-ls
+      rm "$out/bin/${pname}.bat" # windows file
+    fi
+    # contains secrets and should not be in the nix store
+    # TODO document how to handle RELEASE_COOKIE
+    # secrets should not be in the nix store.
+    # This is only used for connecting multiple nodes
+    if [ -e $out/releases/COOKIE ]; then # absent in special cases, i.e. elixir-ls
+      rm $out/releases/COOKIE
+    fi
+    # removing unused erlang reference from resulting derivation to reduce
+    # closure size
+    if [ -e $out/erts-* ]; then
+      echo "ERTS found in $out - removing references to erlang to reduce closure size"
+      # there is a link in $out/erts-*/bin/start always
+      # TODO:
+      # sometimes there are links in dependencies like bcrypt compiled binaries
+      # at the moment those are not removed since substituteInPlace will
+      # error on binaries
+      for file in $(rg "${erlang}/lib/erlang" "$out" --files-with-matches); do
+        echo "removing reference to erlang in $file"
+        substituteInPlace "$file" --replace "${erlang}/lib/erlang" "$out"
+      done
+    fi
+  '';
+
+  # TODO investigate why the resulting closure still has
+  # a reference to erlang.
+  # uncommenting the following will fail the build
+  # disallowedReferences = [ erlang ];
+})