From 2e41a1bab32e49568a037ddd962ebbe01c8c2f40 Mon Sep 17 00:00:00 2001
From: arcnmx <arcnmx@users.noreply.github.com>
Date: Wed, 7 Sep 2022 10:09:17 -0700
Subject: [PATCH] systemd: handle `Install.RequiredBy`

Units with

    Install.RequiredBy = [ target ]

set will now be linked in the

    ${target}.requires

directory. Similar to how `Install.WantedBy` already causes a link in
the

    ${target}.wants

directory.
---
 modules/systemd.nix | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/modules/systemd.nix b/modules/systemd.nix
index 0be586d7..ff70edf8 100644
--- a/modules/systemd.nix
+++ b/modules/systemd.nix
@@ -44,14 +44,15 @@ let
         destination = "/${filename}";
       } + "/${filename}";
 
-      wantedBy = target: {
-        name = "systemd/user/${target}.wants/${filename}";
+      install = variant: target: {
+        name = "systemd/user/${target}.${variant}/${filename}";
         value = { inherit source; };
       };
     in lib.singleton {
       name = "systemd/user/${filename}";
       value = { inherit source; };
-    } ++ map wantedBy (serviceCfg.Install.WantedBy or [ ]);
+    } ++ map (install "wants") (serviceCfg.Install.WantedBy or [ ])
+    ++ map (install "requires") (serviceCfg.Install.RequiredBy or [ ]);
 
   buildServices = style: serviceCfgs:
     lib.concatLists (lib.mapAttrsToList (buildService style) serviceCfgs);