nixpkgs/pkgs/development/beam-modules/fetch-mix-deps.nix
Sergei Maximov 2a9336b426 elixir-ls: build LS using the same Elixir version that is used to run LS
The Elixir LS package in Nixpkgs by default used the latest Elixir
version available to compile and run Elixir LS. The user can build
a custom Elixir LS package with a different Elixir version:

    my-custom-elixir-ls = pkgs.elixir-ls.override {
      elixir = my-custom-elixir;
    };

But by doing so the user changes only the Elixir version used to
run Elixir LS; the Elixir version used to compile Elixir LS doesn't
change. As the result, the custom Elixir LS package uses a different
Elixir version at runtime than the Elixir version it was compiled with.

In order to be able to modify the Elixir version used at build time,
I changed `mixRelease` and `fetchMixDeps` to accept `elixir` and
`hex` as parameters (defaults to the latest Elixir and Hex packages).
2021-11-03 08:46:46 +09:00

61 lines
1.5 KiB
Nix

{ stdenvNoCC, lib, elixir, hex, rebar, rebar3, cacert, git }@inputs:
{ pname
, version
, sha256
, src
, mixEnv ? "prod"
, debug ? false
, meta ? { }
, patches ? []
, elixir ? inputs.elixir
, hex ? inputs.hex.override { inherit elixir; }
, ...
}@attrs:
stdenvNoCC.mkDerivation (attrs // {
nativeBuildInputs = [ elixir hex cacert git ];
MIX_ENV = mixEnv;
MIX_DEBUG = if debug then 1 else 0;
DEBUG = if debug then 1 else 0; # for rebar3
# the api with `mix local.rebar rebar path` makes a copy of the binary
MIX_REBAR = "${rebar}/bin/rebar";
MIX_REBAR3 = "${rebar3}/bin/rebar3";
# there is a persistent download failure with absinthe 1.6.3
# those defaults reduce the failure rate
HEX_HTTP_CONCURRENCY = 1;
HEX_HTTP_TIMEOUT = 120;
configurePhase = attrs.configurePhase or ''
runHook preConfigure
export HEX_HOME="$TEMPDIR/.hex";
export MIX_HOME="$TEMPDIR/.mix";
export MIX_DEPS_PATH="$TEMPDIR/deps";
# Rebar
export REBAR_GLOBAL_CONFIG_DIR="$TMPDIR/rebar3"
export REBAR_CACHE_DIR="$TMPDIR/rebar3.cache"
runHook postConfigure
'';
inherit patches;
dontBuild = true;
installPhase = attrs.installPhase or ''
runHook preInstall
mix deps.get --only ${mixEnv}
find "$TEMPDIR/deps" -path '*/.git/*' -a ! -name HEAD -exec rm -rf {} +
cp -r --no-preserve=mode,ownership,timestamps $TEMPDIR/deps $out
runHook postInstall
'';
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = sha256;
impureEnvVars = lib.fetchers.proxyImpureEnvVars;
inherit meta;
})