872987d040
This flag appears to cause issues in 3 out 4 users of mixRelease in Nixpkgs, plus Mobilizon, which isn't merged yet. It might be safer to set it to fals for now, as the runtime error messages produced by it are quite cryptic.
142 lines
4.8 KiB
Nix
142 lines
4.8 KiB
Nix
{ stdenv, lib, elixir, erlang, findutils, hex, rebar, rebar3, fetchMixDeps, makeWrapper, git, ripgrep }@inputs:
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{ pname
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, version
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, src
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, nativeBuildInputs ? [ ]
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, buildInputs ? [ ]
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, meta ? { }
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, enableDebugInfo ? false
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, mixEnv ? "prod"
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, compileFlags ? [ ]
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# mix fixed output derivation dependencies
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, mixFodDeps ? null
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# mix dependencies generated by mix2nix
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# this assumes each dependency is built by buildMix or buildRebar3
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# each dependency needs to have a setup hook to add the lib path to $ERL_LIBS
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# this is how mix will find dependencies
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, mixNixDeps ? { }
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, elixir ? inputs.elixir
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, hex ? inputs.hex.override { inherit elixir; }
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# This reduces closure size, but can lead to some hard to understand runtime
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# errors, so use with caution. See e.g.
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# https://github.com/whitfin/cachex/issues/205
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# https://framagit.org/framasoft/mobilizon/-/issues/1169
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, stripDebug ? false
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, ...
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}@attrs:
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let
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# remove non standard attributes that cannot be coerced to strings
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overridable = builtins.removeAttrs attrs [ "compileFlags" "mixNixDeps" ];
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in
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assert mixNixDeps != { } -> mixFodDeps == null;
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assert stripDebug -> !enableDebugInfo;
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stdenv.mkDerivation (overridable // {
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# rg is used as a better grep to search for erlang references in the final release
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nativeBuildInputs = nativeBuildInputs ++ [ erlang hex elixir makeWrapper git ripgrep ];
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buildInputs = buildInputs ++ builtins.attrValues mixNixDeps;
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MIX_ENV = mixEnv;
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MIX_DEBUG = if enableDebugInfo then 1 else 0;
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HEX_OFFLINE = 1;
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DEBUG = if enableDebugInfo then 1 else 0; # for Rebar3 compilation
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# the api with `mix local.rebar rebar path` makes a copy of the binary
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# some older dependencies still use rebar
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MIX_REBAR = "${rebar}/bin/rebar";
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MIX_REBAR3 = "${rebar3}/bin/rebar3";
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postUnpack = ''
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export HEX_HOME="$TEMPDIR/hex"
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export MIX_HOME="$TEMPDIR/mix"
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# Rebar
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export REBAR_GLOBAL_CONFIG_DIR="$TEMPDIR/rebar3"
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export REBAR_CACHE_DIR="$TEMPDIR/rebar3.cache"
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${lib.optionalString (mixFodDeps != null) ''
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# compilation of the dependencies will require
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# that the dependency path is writable
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# thus a copy to the TEMPDIR is inevitable here
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export MIX_DEPS_PATH="$TEMPDIR/deps"
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cp --no-preserve=mode -R "${mixFodDeps}" "$MIX_DEPS_PATH"
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''
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}
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'' + (attrs.postUnpack or "");
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configurePhase = attrs.configurePhase or ''
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runHook preConfigure
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${./mix-configure-hook.sh}
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# this is needed for projects that have a specific compile step
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# the dependency needs to be compiled in order for the task
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# to be available
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# Phoenix projects for example will need compile.phoenix
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mix deps.compile --no-deps-check --skip-umbrella-children
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runHook postConfigure
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'';
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buildPhase = attrs.buildPhase or ''
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runHook preBuild
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mix compile --no-deps-check ${lib.concatStringsSep " " compileFlags}
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runHook postBuild
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'';
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installPhase = attrs.installPhase or ''
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runHook preInstall
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mix release --no-deps-check --path "$out"
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runHook postInstall
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'';
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# Stripping of the binary is intentional
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# even though it does not affect beam files
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# it is necessary for NIFs binaries
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postFixup = ''
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if [ -e "$out/bin/${pname}.bat" ]; then # absent in special cases, i.e. elixir-ls
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rm "$out/bin/${pname}.bat" # windows file
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fi
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# contains secrets and should not be in the nix store
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# TODO document how to handle RELEASE_COOKIE
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# secrets should not be in the nix store.
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# This is only used for connecting multiple nodes
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if [ -e $out/releases/COOKIE ]; then # absent in special cases, i.e. elixir-ls
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rm $out/releases/COOKIE
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fi
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# removing unused erlang reference from resulting derivation to reduce
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# closure size
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if [ -e $out/erts-* ]; then
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echo "ERTS found in $out - removing references to erlang to reduce closure size"
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# there is a link in $out/erts-*/bin/start always
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# TODO:
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# sometimes there are links in dependencies like bcrypt compiled binaries
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# at the moment those are not removed since substituteInPlace will
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# error on binaries
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for file in $(rg "${erlang}/lib/erlang" "$out" --files-with-matches); do
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echo "removing reference to erlang in $file"
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substituteInPlace "$file" --replace "${erlang}/lib/erlang" "$out"
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done
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fi
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'' + lib.optionalString stripDebug ''
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# strip debug symbols to avoid hardreferences to "foreign" closures actually
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# not needed at runtime, while at the same time reduce size of BEAM files.
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erl -noinput -eval 'lists:foreach(fun(F) -> io:format("Stripping ~p.~n", [F]), beam_lib:strip(F) end, filelib:wildcard("'"$out"'/**/*.beam"))' -s init stop
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'';
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# TODO investigate why the resulting closure still has
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# a reference to erlang.
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# uncommenting the following will fail the build
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# disallowedReferences = [ erlang ];
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})
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