nixos/gnupg: add systemd configuration

This depended on the systemd user configuration provided upstream in
doc/examples.  However, this was all removed in:

https://github.com/gpg/gnupg/commit/eae28f1bd4a5632e8f8e85b7248d1c4d4a10a5ed

1 files changed, 76 insertions, 5 deletions

diff --git a/nixos/modules/programs/gnupg.nix b/nixos/modules/programs/gnupg.nix
index cb8d0ecff4cb8..0ca159bdad0cb 100644
--- a/nixos/modules/programs/gnupg.nix
+++ b/nixos/modules/programs/gnupg.nix
@@ -95,36 +95,107 @@ in
   config = mkIf cfg.agent.enable {
     # This overrides the systemd user unit shipped with the gnupg package
     systemd.user.services.gpg-agent = mkIf (cfg.agent.pinentryFlavor != null) {
-      serviceConfig.ExecStart = [ "" ''
-        ${cfg.package}/bin/gpg-agent --supervised \
-          --pinentry-program ${pkgs.pinentry.${cfg.agent.pinentryFlavor}}/bin/pinentry
-      '' ];
+      unitConfig = {
+        Description = "GnuPG cryptographic agent and passphrase cache";
+        Documentation = "man:gpg-agent(1)";
+        Requires = [ "gpg-agent.socket" ];
+      };
+      serviceConfig = {
+        ExecStart = ''
+          ${cfg.package}/bin/gpg-agent --supervised \
+            --pinentry-program ${pkgs.pinentry.${cfg.agent.pinentryFlavor}}/bin/pinentry
+        '';
+        ExecReload = "${cfg.package}/bin/gpgconf --reload gpg-agent";
+      };
     };
 
     systemd.user.sockets.gpg-agent = {
+      unitConfig = {
+        Description = "GnuPG cryptographic agent and passphrase cache";
+        Documentation = "man:gpg-agent(1)";
+      };
+      socketConfig = {
+        ListenStream = "%t/gnupg/S.gpg-agent";
+        FileDescriptorName = "std";
+        SocketMode = "0600";
+        DirectoryMode = "0700";
+      };
       wantedBy = [ "sockets.target" ];
     };
 
     systemd.user.sockets.gpg-agent-ssh = mkIf cfg.agent.enableSSHSupport {
+      unitConfig = {
+        Description = "GnuPG cryptographic agent (ssh-agent emulation)";
+        Documentation = "man:gpg-agent(1) man:ssh-add(1) man:ssh-agent(1) man:ssh(1)";
+      };
+      socketConfig = {
+        ListenStream = "%t/gnupg/S.gpg-agent.ssh";
+        FileDescriptorName = "ssh";
+        Service = "gpg-agent.service";
+        SocketMode = "0600";
+        DirectoryMode = "0700";
+      };
       wantedBy = [ "sockets.target" ];
     };
 
     systemd.user.sockets.gpg-agent-extra = mkIf cfg.agent.enableExtraSocket {
+      unitConfig = {
+        Description = "GnuPG cryptographic agent and passphrase cache (restricted)";
+        Documentation = "man:gpg-agent(1)";
+      };
+      socketConfig = {
+        ListenStream = "%t/gnupg/S.gpg-agent.extra";
+        FileDescriptorName = "extra";
+        Service = "gpg-agent.service";
+        SocketMode = "0600";
+        DirectoryMode = "0700";
+      };
       wantedBy = [ "sockets.target" ];
     };
 
     systemd.user.sockets.gpg-agent-browser = mkIf cfg.agent.enableBrowserSocket {
+      unitConfig = {
+        Description = "GnuPG cryptographic agent and passphrase cache (access for web browsers)";
+        Documentation = "man:gpg-agent(1)";
+      };
+      socketConfig = {
+        ListenStream = "%t/gnupg/S.gpg-agent.browser";
+        FileDescriptorName = "browser";
+        Service = "gpg-agent.service";
+        SocketMode = "0600";
+        DirectoryMode = "0700";
+      };
       wantedBy = [ "sockets.target" ];
     };
 
+    systemd.user.services.dirmngr = mkIf cfg.dirmngr.enable {
+      unitConfig = {
+        Description = "GnuPG network certificate management daemon";
+        Documentation = "man:dirmngr(8)";
+        Requires = "dirmngr.socket";
+      };
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/dirmngr --supervised";
+        ExecReload = "${cfg.package}/bin/gpgconf --reload dirmngr";
+      };
+    };
+
     systemd.user.sockets.dirmngr = mkIf cfg.dirmngr.enable {
+      unitConfig = {
+        Description = "GnuPG network certificate management daemon";
+        Documentation = "man:dirmngr(8)";
+      };
+      socketConfig = {
+        ListenStream = "%t/gnupg/S.dirmngr";
+        SocketMode = "0600";
+        DirectoryMode = "0700";
+      };
       wantedBy = [ "sockets.target" ];
     };
 
     services.dbus.packages = mkIf (cfg.agent.pinentryFlavor == "gnome3") [ pkgs.gcr ];
 
     environment.systemPackages = with pkgs; [ cfg.package ];
-    systemd.packages = [ cfg.package ];
 
     environment.interactiveShellInit = ''
       # Bind gpg-agent to this TTY if gpg commands are used.