Step 4

.agents/codebase-insights.txt: 
appimage-scripts/build_appimage2.sh: 
nix/packages/default.nix: 

Signed-off-by: Tzanko Matev <[email protected]>

Author: tzanko-matev

.agents/codebase-insights.txt

@@ -24,4 +24,4 @@
 - `ct record` verifies that `codetracer_python_recorder` is importable before launching the db backend and prints actionable guidance if the module is missing or broken.
 - Sudoku test-program datasets include intentionally invalid boards (e.g., examples #3 and #6) with duplicate digits inside a sub-grid; solvers should detect and report these gracefully.
 - `appimage-scripts/build_appimage.sh` assumes a devshell: it invokes `nix build`/`nix eval` directly and runs `npm install`/`npx yarn`, so it needs host network access and the git worktree metadata that a pure derivation build lacks.
-- `appimage-scripts/build_appimage2.sh` relies on `packages.${system}.appimageDeps` producing an AppDir-like tree (bin/, lib/) with transitive libs resolved via `lddtree`, so a single `cp` seeds the AppDir.
+- `appimage-scripts/build_appimage2.sh` now consumes `packages.${system}.appimagePayload`, which layers the Rust binaries atop the dependency tree from `appimageDeps`, so the script just copies one derivation output into the AppDir.

appimage-scripts/build_appimage2.sh

@@ -34,9 +34,9 @@ mkdir -p "${APP_DIR}"
 export NIX_CODETRACER_EXE_DIR="${APP_DIR}"
 
 CURRENT_NIX_SYSTEM=$(nix eval --impure --raw --expr 'builtins.currentSystem')
-APPIMAGE_DEPS=$(nix build "${ROOT_PATH}#packages.${CURRENT_NIX_SYSTEM}.appimageDeps" --no-link --print-out-paths | tail -n1)
+APPIMAGE_PAYLOAD=$(nix build "${ROOT_PATH}#packages.${CURRENT_NIX_SYSTEM}.appimagePayload" --no-link --print-out-paths | tail -n1)
 
-cp -Lr "${APPIMAGE_DEPS}/." "${APP_DIR}/"
+cp -Lr "${APPIMAGE_PAYLOAD}/." "${APP_DIR}/"
 
 chmod -R u+rwX "${APP_DIR}"
 
@@ -84,14 +84,8 @@ exec "${HERE}/bin/ct_unwrapped" "$@"
 
 EOF
 
-# Build/setup db-backend
-bash "${ROOT_PATH}/appimage-scripts/build_db_backend.sh"
-
-# Build/setup backend-manager
-bash "${ROOT_PATH}/appimage-scripts/build_backend_manager.sh"
-
 # Ensure copied binaries are executable.
-chmod +x "${APP_DIR}/bin/"{cargo-stylus,ctags,curl,nargo,node,wazero}
+chmod +x "${APP_DIR}/bin/"{cargo-stylus,ctags,curl,nargo,node,wazero,db-backend,backend-manager}
 
 chmod -R +x "${APP_DIR}/bin"
 chmod -R +x "${APP_DIR}/electron"

nix/packages/default.nix

@@ -191,6 +191,30 @@
           chmod +x "$out/bin"/*
         '';
 
+        appimagePayload = pkgs.runCommand "codetracer-appimage-payload" {
+          nativeBuildInputs = [
+            pkgs.bashInteractive
+            pkgs.coreutils
+          ];
+        } ''
+          set -euo pipefail
+
+          mkdir -p "$out"
+          cp -R ${appimageDeps}/. "$out/"
+          chmod -R u+w "$out"
+          mkdir -p "$out/bin"
+
+          install_bin() {
+            local src=$1
+            local dest=$2
+            cp -L "$src" "$out/bin/$(basename "$dest")"
+            chmod +x "$out/bin/$(basename "$dest")"
+          }
+
+          install_bin ${db-backend}/bin/db-backend db-backend
+          install_bin ${backend-manager}/bin/backend-manager backend-manager
+        '';
+
         indexJavascript = stdenv.mkDerivation {
           name = "index.js";
           pname = "index.js";