From ab8ee06cbfce42f94e07a0a694701a4df9201815 Mon Sep 17 00:00:00 2001
From: sommerfeld <sommerfeld@sommerfeld.dev>
Date: Wed, 13 May 2026 13:43:40 +0100
Subject: feat(nvim): pin copilot to Node 24 to dodge LSP/Node 26 incompat

copilot-language-server emits 'HTTP 200 response does not appear to
originate from GitHub' under Node 26 (the current Arch nodejs). Upstream
tracking:
  https://github.com/zbirenbaum/copilot.lua/issues/695
  https://github.com/github/copilot.vim/issues/282
  https://github.com/github/copilot-language-server-release/issues/45

Workaround universally confirmed in those threads is to run the
language-server under Node 24. Rather than downgrade system nodejs (used
by lots of other tooling) install a private Node 24 under
~/.local/share/copilot-node/ via a chezmoi run_onchange script that
verifies the official sha256, and point copilot.lua at it via
copilot_node_command. Drop in once, bump NODE_VERSION when the upstream
incompatibility is resolved.
---
 dot_config/nvim/lua/plugins/ai.lua         |  3 ++
 run_onchange_after_install-copilot-node.sh | 44 ++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100755 run_onchange_after_install-copilot-node.sh

diff --git a/dot_config/nvim/lua/plugins/ai.lua b/dot_config/nvim/lua/plugins/ai.lua
index 8c213b5..995f6a0 100644
--- a/dot_config/nvim/lua/plugins/ai.lua
+++ b/dot_config/nvim/lua/plugins/ai.lua
@@ -1,6 +1,9 @@
 require("copilot").setup({
   suggestion = { enabled = false },
   panel = { enabled = false },
+  -- Pinned Node 24 runtime; system nodejs (26.x) is incompatible with
+  -- copilot-language-server. See ~/.local/share/chezmoi/run_onchange_after_install-copilot-node.sh
+  copilot_node_command = vim.fs.joinpath(vim.env.XDG_DATA_HOME or (vim.env.HOME .. "/.local/share"), "copilot-node/bin/node"),
   server_opts_overrides = {
     settings = {
       telemetry = {
diff --git a/run_onchange_after_install-copilot-node.sh b/run_onchange_after_install-copilot-node.sh
new file mode 100755
index 0000000..82c0254
--- /dev/null
+++ b/run_onchange_after_install-copilot-node.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# Install a Node.js 24 (LTS) runtime under ~/.local/share/copilot-node/ for the
+# exclusive use of copilot.lua / copilot-lsp inside neovim. System-wide nodejs
+# (currently 26.x in Arch) is unaffected.
+#
+# Background: copilot-language-server is incompatible with Node 26's default
+# fetch implementation. Multiple upstream issues, no fix yet:
+#   https://github.com/zbirenbaum/copilot.lua/issues/695
+#   https://github.com/github/copilot.vim/issues/282
+#   https://github.com/github/copilot-language-server-release/issues/45
+# Symptom: "HTTP 200 response does not appear to originate from GitHub".
+# Workaround universally confirmed in those threads: use Node 24.
+#
+# chezmoi re-runs this only when the script content (and thus NODE_VERSION)
+# changes. Bump NODE_VERSION + NODE_SHA256 below to upgrade.
+
+set -eu
+
+NODE_VERSION=24.15.0
+# linux-x64 sha256 from https://nodejs.org/download/release/latest-v24.x/SHASUMS256.txt
+NODE_SHA256=472655581fb851559730c48763e0c9d3bc25975c59d518003fc0849d3e4ba0f6
+TARBALL="node-v${NODE_VERSION}-linux-x64.tar.xz"
+
+DEST="${XDG_DATA_HOME:-$HOME/.local/share}/copilot-node"
+STAMP="$DEST/.installed-${NODE_VERSION}"
+
+if [ -x "$DEST/bin/node" ] && [ -f "$STAMP" ]; then
+  exit 0
+fi
+
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT
+
+curl --fail --silent --show-error --location \
+  --output "$tmp/$TARBALL" \
+  "https://nodejs.org/download/release/v${NODE_VERSION}/${TARBALL}"
+
+printf '%s  %s\n' "$NODE_SHA256" "$tmp/$TARBALL" | sha256sum -c -
+
+tar -xJf "$tmp/$TARBALL" -C "$tmp"
+rm -rf "$DEST"
+mkdir -p "$(dirname "$DEST")"
+mv "$tmp/node-v${NODE_VERSION}-linux-x64" "$DEST"
+touch "$STAMP"
-- 
cgit v1.3.1