overlays/default.nix

@@ -19,6 +19,7 @@
                 nextcloud-skeleton = prev.callPackage ./pkgs/nextcloud-skeleton { };
               }
             )
+            (import ./matrix-synapse.nix)
           ];
         }
       );

overlays/matrix-synapse.nix

@@ -0,0 +1,18 @@
+final: prev: {
+  matrix-synapse-unwrapped = prev.matrix-synapse-unwrapped.overrideAttrs (oldAttrs: rec {
+    inherit (oldAttrs) pname;
+    version = "1.127.1";
+    src = prev.fetchFromGitHub {
+      owner = "element-hq";
+      repo = "synapse";
+      rev = "v${version}";
+      hash = "sha256-DNUKbb+d3BBp8guas6apQ4yFeXCc0Ilijtbt1hZkap4=";
+    };
+
+    cargoDeps = prev.rustPlatform.fetchCargoVendor {
+      inherit src;
+      name = "${pname}-${version}";
+      hash = "sha256-wI3vOfR5UpVFls2wPfgeIEj2+bmWdL3pDSsKfT+ysw8=";
+    };
+  });
+}