build(pkgs/back): Apply source filtering

This avoids useless rebuilds, just because files like the `README.md`
changed.

1 files changed, 11 insertions, 2 deletions

diff --git a/pkgs/by-name/ba/back/package.nix b/pkgs/by-name/ba/back/package.nix
index dbc00cb..faa0e1d 100644
--- a/pkgs/by-name/ba/back/package.nix
+++ b/pkgs/by-name/ba/back/package.nix
@@ -8,12 +8,21 @@
 #
 # You should have received a copy of the License along with this program.
 # If not, see <https://www.gnu.org/licenses/agpl.txt>.
-{rustPlatform}:
+{
+  rustPlatform,
+  lib,
+}:
 rustPlatform.buildRustPackage {
   pname = "back";
   version = "1.0.0";
 
-  src = ./.;
+  src = lib.cleanSourceWith {
+    src = lib.cleanSource ./.;
+    filter = name: type:
+      (type == "directory")
+      || (builtins.elem (builtins.baseNameOf name) ["Cargo.toml" "Cargo.lock" "style.css"])
+      || (lib.strings.hasSuffix ".rs" (builtins.baseNameOf name));
+  };
 
   doCheck = true;