nixpkgs/pkgs/development/beam-modules/fetch-mix-deps.nix

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{ stdenvNoCC, lib, elixir, hex, rebar, rebar3, cacert, git }:
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{ pname
, version
, sha256
, src
, mixEnv ? "prod"
, debug ? false
, meta ? { }
, patches ? []
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, ...
}@attrs:
stdenvNoCC.mkDerivation (attrs // {
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nativeBuildInputs = [ elixir hex cacert git ];
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MIX_ENV = mixEnv;
MIX_DEBUG = if debug then 1 else 0;
DEBUG = if debug then 1 else 0; # for rebar3
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# 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
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export HEX_HOME="$TEMPDIR/.hex";
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export MIX_HOME="$TEMPDIR/.mix";
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export MIX_DEPS_PATH="$TEMPDIR/deps";
# Rebar
export REBAR_GLOBAL_CONFIG_DIR="$TMPDIR/rebar3"
export REBAR_CACHE_DIR="$TMPDIR/rebar3.cache"
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runHook postConfigure
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'';
inherit patches;
dontBuild = true;
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installPhase = attrs.installPhase or ''
runHook preInstall
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mix deps.get --only ${mixEnv}
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find "$TEMPDIR/deps" -path '*/.git/*' -a ! -name HEAD -exec rm -rf {} +
cp -r --no-preserve=mode,ownership,timestamps $TEMPDIR/deps $out
runHook postInstall
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'';
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = sha256;
impureEnvVars = lib.fetchers.proxyImpureEnvVars;
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inherit meta;
})