initial commit

lib/install-cache.nix

@@ -0,0 +1,34 @@
+{ pkgs, cache }:
+
+pkgs.writeShellScriptBin "install-deno-cache" ''
+  set -euo pipefail
+
+  if [ -z "''${DENO_DIR:-}" ]; then
+    echo "Error: DENO_DIR environment variable must be set" >&2
+    exit 1
+  fi
+
+  echo "Installing Deno cache to: $DENO_DIR"
+
+  # Remove existing cache if it exists
+  if [ -d "$DENO_DIR" ]; then
+    echo "Removing existing cache..."
+    rm -rf "$DENO_DIR"
+  fi
+
+  # Copy the shared cache, dereferencing symlinks
+  if [ -d "${cache}" ]; then
+    echo "Copying shared cache..."
+    mkdir -p "$(dirname "$DENO_DIR")"
+    cp -rL "${cache}" "$DENO_DIR"
+    chmod -R u+w "$DENO_DIR"
+    echo "Cache installed successfully!"
+  else
+    echo "No shared cache found at ${cache}"
+    mkdir -p "$DENO_DIR"
+  fi
+
+  if [ -d "$DENO_DIR/npm" ]; then
+    echo "NPM packages in cache: $(find "$DENO_DIR/npm" -name "package.json" | wc -l)"
+  fi
+''