From 17c41dbc33a395f654194bdc956b9eabbddb12f4 Mon Sep 17 00:00:00 2001
From: Juozas Norkus <norkus@norkus.net>
Date: Fri, 29 Sep 2023 16:58:04 +0300
Subject: [PATCH] fix: nix build (#247)

---
 flake.lock |  6 +++---
 flake.nix  |  6 +++++-
 mix.exs    | 19 +++++++++++++++++--
 mix.lock   |  2 +-
 4 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/flake.lock b/flake.lock
index 17d72b54..3d7a621b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693535723,
-        "narHash": "sha256-ERFGB4HsvW4MASfaiYa5KDpaMc6US4FgK5KAYROCsbg=",
+        "lastModified": 1695669266,
+        "narHash": "sha256-QrCnbAcP9DtchKYaEC5LMpOBlpp2gBxua2626g3W41Q=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "76ae447f06e8be22c1adba3d979bcf5a3b7b14b9",
+        "rev": "7e5e43ef91a3828f92f8dd149d9af6521d0c736b",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index c7268a3b..66ddc94a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,7 +59,7 @@
             mixFodDeps = beamPackages.fetchMixDeps {
               inherit src version;
               pname = "${pname}-deps";
-              hash = "sha256-jUkz/pu3iyizpHkMYgmbYfalFv10t11b6SmLVEXAJ30=";
+              hash = "sha256-sRve0L7qFw5vEsespIXVg4loSej+oLO1ewdmT6qGExw=";
             };
 
             preConfigure = ''
@@ -73,6 +73,10 @@
               export PATH="$bindir:$PATH"
             '';
 
+            preBuild = ''
+              export BURRITO_ERTS_PATH=${beamPackages.erlang}/lib/erlang
+            '';
+
             preInstall =
               if type == "local" then ''
                 export BURRITO_TARGET="${burritoExe(system)}"
diff --git a/mix.exs b/mix.exs
index e7a65cad..2f4883ae 100644
--- a/mix.exs
+++ b/mix.exs
@@ -40,7 +40,7 @@ defmodule NextLS.MixProject do
       next_ls: [
         steps: [:assemble, &Burrito.wrap/1],
         burrito: [
-          targets: [
+          targets: inject_custom_erts([
             darwin_arm64: [os: :darwin, cpu: :aarch64],
             darwin_amd64: [os: :darwin, cpu: :x86_64],
             linux_arm64: [os: :linux, cpu: :aarch64, libc: :gnu],
@@ -48,7 +48,7 @@ defmodule NextLS.MixProject do
             linux_arm64_musl: [os: :linux, cpu: :aarch64, libc: :musl],
             linux_amd64_musl: [os: :linux, cpu: :x86_64, libc: :musl],
             windows_amd64: [os: :windows, cpu: :x86_64]
-          ]
+          ])
         ]
       ]
     ]
@@ -84,4 +84,19 @@ defmodule NextLS.MixProject do
       files: ~w(lib LICENSE mix.exs priv README.md .formatter.exs)
     ]
   end
+
+  defp inject_custom_erts(targets) do
+    # By default, Burrito downloads ERTS from https://burrito-otp.b-cdn.net.
+    # When building with Nix, side-effects like network access are not allowed,
+    # so we need to inject our own ERTS path.
+
+    erts_path = System.get_env("BURRITO_ERTS_PATH", "")
+
+    Enum.map(targets, fn {target_name, target_conf} ->
+      case erts_path do
+        "" -> {target_name, target_conf}
+        path -> {target_name, [{:custom_erts, path} | target_conf]}
+      end
+    end)
+  end
 end
diff --git a/mix.lock b/mix.lock
index 044c3ee9..7b1a1f58 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,5 +1,5 @@
 %{
-  "burrito": {:git, "https://github.com/burrito-elixir/burrito.git", "5c7b29811279f3272005534a3fec29a687e9b6bf", []},
+  "burrito": {:git, "https://github.com/burrito-elixir/burrito.git", "a86857636eaba9a7fa179fd970ed6cf82e9e7d59", []},
   "bypass": {:hex, :bypass, "2.1.0", "909782781bf8e20ee86a9cabde36b259d44af8b9f38756173e8f5e2e1fabb9b1", [:mix], [{:plug, "~> 1.7", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.0", [hex: :plug_cowboy, repo: "hexpm", optional: false]}, {:ranch, "~> 1.3", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "d9b5df8fa5b7a6efa08384e9bbecfe4ce61c77d28a4282f79e02f1ef78d96b80"},
   "castore": {:hex, :castore, "1.0.3", "7130ba6d24c8424014194676d608cb989f62ef8039efd50ff4b3f33286d06db8", [:mix], [], "hexpm", "680ab01ef5d15b161ed6a95449fac5c6b8f60055677a8e79acf01b27baa4390b"},
   "cc_precompiler": {:hex, :cc_precompiler, "0.1.8", "933a5f4da3b19ee56539a076076ce4d7716d64efc8db46fd066996a7e46e2bfd", [:mix], [{:elixir_make, "~> 0.7.3", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "176bdf4366956e456bf761b54ad70bc4103d0269ca9558fd7cee93d1b3f116db"},