Switching to a home-manager config did not fix it.

nix/configuration/roles/gpg/default.nix

@@ -42,35 +42,54 @@
   home-manager.users.talexander =
     { pkgs, ... }:
     {
-      home.file.".gnupg/scdaemon.conf" = {
+      # home.file.".gnupg/scdaemon.conf" = {
-        source = ./files/scdaemon.conf;
+      #   source = ./files/scdaemon.conf;
-      };
-    };
-
-  # programs.gnupg.dirmngr.enable = true;
-  programs.gnupg.agent = {
-    enable = true;
-    enableSSHSupport = true;
-    pinentryPackage = pkgs.pinentry-qt;
-    # settings = {
-    #   disable-ccid = true;
       # };
+      programs.gpg = {
+        enable = true; # does this install a user-specific version of gnupg in addition to the system-wide package installed in configuration.nix?
+        # homedir = "${config.home.homeDirectory}/.gnupg";
+        publicKeys = [
+          {
+            source = ./files/gpg.asc;
+            trust = 5;
+          }
+        ];
+        settings = {
+          use-agent = true; # what relation does this have to the settings in configuration.nix and also to the home-manager gpg-agent settings below?
+        };
+        scdaemonSettings = {
+          disable-ccid = true; # disable gnupg's built-in smartcard reader function in order to default to system's smartcard reader (pcsclite package)
+        };
       };
 
-  environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
+      services.gpg-agent = {
-    hideMounts = true;
+        enable = true;
-    users.talexander = {
+        enableSshSupport = true;
-      directories = [
+        enableZshIntegration = true;
-        {
+        enableScDaemon = true; # what relation does this have with the scdaemon setting above and/or in configuration.nix?
-          directory = ".gnupg";
+        pinentryPackage = pkgs.pinentry-qt;
-          user = "talexander";
+        defaultCacheTtl = 60;
-          group = "talexander";
+        maxCacheTtl = 120;
-          mode = "0700";
+        extraConfig = ''
-        } # Local keyring
+          ttyname $GPG_TTY
-      ];
+        '';
       };
     };
 
+  # environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
+  #   hideMounts = true;
+  #   users.talexander = {
+  #     directories = [
+  #       {
+  #         directory = ".gnupg";
+  #         user = "talexander";
+  #         group = "talexander";
+  #         mode = "0700";
+  #       } # Local keyring
+  #     ];
+  #   };
+  # };
+
   # nixpkgs.overlays = [
   #   (final: prev: {
   #     pcsclite = prev.pcsclite.overrideAttrs (old: {
@@ -122,5 +141,4 @@
   #   })
   # ];
 
-  programs.gnupg.agent.enableExtraSocket = true;
 }

nix/configuration/roles/gpg/files/gpg.asc

@@ -0,0 +1,27 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+3aqYpMRxpn2t6Nswax1MIM8DBQ==
+=dzEV
+-----END PGP PUBLIC KEY BLOCK-----