build: Permanently disable linking against systemd

systemd is used by cardano-node for the scribe-backend, but we never use this, so we
disable it unconditionally. Our distributed builds (binary and docker) are statically
linked, so it would not be available anyways.

Author: sgillespie

cabal.project

@@ -36,6 +36,11 @@ package cardano-db-tool
 package cardano-smash-server
   ghc-options: -Wall -Werror -Wredundant-constraints -Wincomplete-uni-patterns -Wincomplete-record-updates -Wpartial-fields -Wunused-imports -Wunused-packages
 
+package cardano-node
+   -- We are using cardano-node as a library and we never use the systemd scribe, so there
+   -- is no benefit to linking against it
+   flags: -systemd
+
 package postgresql-libpq
    flags: +use-pkg-config
 

flake.nix

@@ -190,9 +190,6 @@
                 packages.katip.doExactConfig = true;
                 # Split data to reduce closure size
                 packages.ekg.components.library.enableSeparateDataOutput = true;
-                # Systemd can't be statically linked
-                packages.cardano-node.flags.systemd =
-                  !pkgs.stdenv.hostPlatform.isMusl;
               })
 
               ({
@@ -248,20 +245,6 @@
                   packages.cardano-chain-gen.components.tests.cardano-chain-gen =
                     postgresTest;
                 })
-
-              ({ lib, pkgs, ... }: {
-                # TODO[sgillespie]: The following line is currently required to avoid
-                # the following error:
-                #
-                #     error: The Haskell package set does not contain the package:
-                #     lobemo-scribe-systemd (build dependency).  If you are using Stackage,
-                #     make sure that you are using a snapshot that contains the
-                #     package. Otherwise you may need to update the Hackage snapshot you are
-                #     using, usually by updating haskell.nix.
-                #
-                # This started happening here: https://github.com/input-output-hk/hackage.nix/commit/958f69d793847b532874a66201a491423f2ec551
-                packages.cardano-node.flags.systemd = lib.mkForce false;
-              })
             ];
           })).appendOverlays [
             # Collect local package `exe`s