From 4531deeed8529305f327ea6bf6c06fa417331586 Mon Sep 17 00:00:00 2001
From: Thomas J <git@thomasjasny.de>
Date: Sun, 25 May 2025 18:58:12 +0200
Subject: [PATCH] nixos/borgmatic: do not create source directories for empty
 databases (#410752)

---
 nixos/modules/services/backup/borgmatic.nix | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/nixos/modules/services/backup/borgmatic.nix b/nixos/modules/services/backup/borgmatic.nix
index f2f35f97d0dd..75dbf5fe1c77 100644
--- a/nixos/modules/services/backup/borgmatic.nix
+++ b/nixos/modules/services/backup/borgmatic.nix
@@ -17,7 +17,7 @@ let
   addRequiredBinaries =
     s:
     s
-    // {
+    // (lib.optionalAttrs (s ? postgresql_databases && s.postgresql_databases != [ ]) {
       postgresql_databases = map (
         d:
         let
@@ -33,7 +33,9 @@ let
           psql_command = "${as_user}${postgresql}/bin/psql";
         }
         // d
-      ) (s.postgresql_databases or [ ]);
+      ) s.postgresql_databases;
+    })
+    // (lib.optionalAttrs (s ? mariadb_databases && s.mariadb_databases != [ ]) {
       mariadb_databases = map (
         d:
         {
@@ -41,7 +43,9 @@ let
           mariadb_command = "${mysql}/bin/mariadb";
         }
         // d
-      ) (s.mariadb_databases or [ ]);
+      ) s.mariadb_databases;
+    })
+    // (lib.optionalAttrs (s ? mysql_databases && s.mysql_databases != [ ]) {
       mysql_databases = map (
         d:
         {
@@ -49,8 +53,8 @@ let
           mysql_command = "${mysql}/bin/mysql";
         }
         // d
-      ) (s.mysql_databases or [ ]);
-    };
+      ) s.mysql_databases;
+    });
 
   repository =
     with lib.types;
@@ -149,7 +153,9 @@ in
   config =
     let
       configFiles =
-        (lib.optionalAttrs (cfg.settings != null) { "borgmatic/config.yaml".source = cfgfile; })
+        (lib.optionalAttrs (cfg.settings != null) {
+          "borgmatic/config.yaml".source = cfgfile;
+        })
         // lib.mapAttrs' (
           name: value:
           lib.nameValuePair "borgmatic.d/${name}.yaml" {