ci: simplify web.nix (symlink .next, bunx next start from repo), fix CI args

.github/workflows/ci.yml

@@ -232,7 +232,7 @@ jobs:
       - name: Unpack .next
         run: tar -xzf /tmp/web-next/web-next.tar.gz -C apps/web/
 
-      - name: Install deps (for node_modules in web.nix)
+      - name: Install deps (for bunx in web.nix)
         run: bun install --frozen-lockfile
 
       - name: Build web Nix derivation
@@ -242,8 +242,6 @@ jobs:
           nix-build -E \
             "let pkgs = import <nixpkgs> {}; in pkgs.callPackage ${REPO_ROOT}/web.nix {
               webNextDir = ${REPO_ROOT}/apps/web/.next;
-              webPkgDir = ${REPO_ROOT}/apps/web;
-              nodeModulesPath = ${REPO_ROOT};
             }" \
             --impure --option sandbox false
           STORE_PATH=$(readlink result)

web.nix

@@ -1,59 +1,43 @@
-# ─── Web: packages pre-built .next ──────────────────────────────────────
-# Next.js 16/Turbopack has a Bun incompatibility in the Nix sandbox.
-# Fix: CI builds .next with `bun run build`, then this derivation packages
-# the .next + node_modules (from a full monorepo install) into a Nix store path.
-#
-# `webNextDir`  = Nix path to pre-built .next directory
-# `webPkgDir`   = Nix path to apps/web
-# `nodeModulesPath` = Nix path to monorepo node_modules (root)
+# ─── Web: packages pre-built .next into a Nix store path ──────────────────
+# Next.js 16/Turbopack has a Bun incompatibility in the Nix sandbox,
+# so .next is built in CI via `bun run build` and packaged here.
 #
 # Usage:
-#   nix-build -E 'let pkgs = import <nixpkgs> {}; in pkgs.callPackage ./web.nix { webNextDir = /abs/apps/web/.next; webPkgDir = /abs/apps/web; nodeModulesPath = /abs; }'
-
+#   nix-build -E 'with import <nixpkgs> {}; callPackage ./web.nix { webNextDir = /abs/apps/web/.next; }'
+#
+# The wrapper symlinks .next from the Nix store (read-only, instant),
+# then runs `bunx next start` from the repo checkout.
 { pkgs
 , stdenv
-, makeBinaryWrapper
+, writeShellScriptBin
 , bun
 , webNextDir
-, webPkgDir
-, nodeModulesPath
 , ...
 }:
 
 stdenv.mkDerivation {
   pname = "mcpedia-web";
   version = "1.0.0";
-  src = pkgs.writeText "dummy-src" "";
-  nativeBuildInputs = [ pkgs.bun makeBinaryWrapper ];
+  src = webNextDir;
   dontUnpack = true;
   buildPhase = "";
   installPhase = ''
-    mkdir -p $out/share/mcpedia-web
+    mkdir -p $out/share/mcpedia-web/.next
+    cp -r "${webNextDir}/." $out/share/mcpedia-web/.next/
 
-    # Copy pre-built .next
-    cp -r "${webNextDir}" $out/share/mcpedia-web/.next
+    NEXT_DIR="$out/share/mcpedia-web/.next"
+    BUN_BIN="${bun}/bin/bun"
 
-    # Copy node_modules from monorepo root (preserves symlinks to workspace pkgs)
-    cp -r "${nodeModulesPath}/node_modules" $out/share/mcpedia-web/node_modules
-
-    # Fix workspace symlinks: node_modules/@mcpedia/* points to ../../packages/*
-    # In the Nix store, resolve to actual package source dirs
-    cd $out/share/mcpedia-web
-    for ws_pkg in @mcpedia/config @mcpedia/core @mcpedia/db @mcpedia/embeddings \
-                  @mcpedia/parser @mcpedia/queue @mcpedia/search @mcpedia/types; do
-      link="node_modules/$ws_pkg"
-      if [ -L "$link" ]; then
-        target=$(readlink -f "$link")
-        rm "$link"
-        mkdir -p "$(dirname "$link")"
-        cp -rL "$target" "$link"
-      fi
-    done
-
-    cp "${webPkgDir}/package.json" $out/share/mcpedia-web/
-
-    makeBinaryWrapper ${pkgs.bun}/bin/bun $out/bin/mcpedia-web \
-      --add-flags "run node_modules/.bin/next start" \
-      --chdir $out/share/mcpedia-web
+    mkdir -p $out/bin
+    cat > $out/bin/mcpedia-web <<WRAPPER
+      #!/usr/bin/env bash
+      export NODE_ENV=production
+      export PORT=4016
+      cd /home/code/mcpedia/apps/web
+      rm -f .next
+      ln -s "$NEXT_DIR" .next
+      exec "$BUN_BIN" x next start -p 4016
+    WRAPPER
+    chmod +x $out/bin/mcpedia-web
   '';
 }