system/ccache: fix extraConfig

overlays/ccache.nix

@@ -0,0 +1,25 @@
+self: super: {
+  ccacheWrapper = super.ccacheWrapper.override {
+    extraConfig = ''
+      export CCACHE_COMPRESS=1
+      export CCACHE_DIR="/var/cache/ccache"
+      export CCACHE_UMASK=007
+      if [ ! -d "$CCACHE_DIR" ]; then
+        echo "====="
+        echo "Directory '$CCACHE_DIR' does not exist"
+        echo "Please create it with:"
+        echo "  sudo mkdir -m0770 '$CCACHE_DIR'"
+        echo "  sudo chown root:nixbld '$CCACHE_DIR'"
+        echo "====="
+        exit 1
+      fi
+      if [ ! -w "$CCACHE_DIR" ]; then
+        echo "====="
+        echo "Directory '$CCACHE_DIR' is not accessible for user $(whoami)"
+        echo "Please verify its access permissions"
+        echo "====="
+        exit 1
+      fi
+    '';
+  };
+}

overlays/default.nix

@@ -1,5 +1,6 @@
 builtins.map (path: import path) [
   ./android-studio.nix
+  ./ccache.nix
   ./discord.nix
   ./eww.nix
   ./material-icons.nix