From 5054b557bf7acb05b6713dc37e7cfb5dbbc09d2b Mon Sep 17 00:00:00 2001
From: chn <chn@chn.moe>
Date: Sat, 6 Sep 2025 08:26:07 +0800
Subject: [PATCH] modules.services.mariadb: allow mount from configurable
 location

---
 devices/pc/default.nix       |  1 +
 devices/srv1/default.nix     |  1 +
 devices/srv2/default.nix     |  1 +
 modules/services/mariadb.nix | 10 +++++++---
 4 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/devices/pc/default.nix b/devices/pc/default.nix
index ba8bdbdd..a3aa9ba2 100644
--- a/devices/pc/default.nix
+++ b/devices/pc/default.nix
@@ -113,6 +113,7 @@ inputs:
         kvm.aarch64 = true;
         nfs."/" = [ "192.168.84.0/24" ];
         peerBanHelper = {};
+        mariadb.mountFrom = "nodatacow";
       };
       bugs = [ "xmunet" "backlight" "amdpstate" "iwlwifi" ];
       packages = { mathematica = {}; vasp = {}; };
diff --git a/devices/srv1/default.nix b/devices/srv1/default.nix
index 984c90df..50cda0b2 100644
--- a/devices/srv1/default.nix
+++ b/devices/srv1/default.nix
@@ -59,6 +59,7 @@ inputs:
             { name = "n1"; mpiThreads = 8; openmpThreads = 4; }
           ];
         };
+        mariadb.mountFrom = "nodatacow";
       };
       packages = { vasp = {}; lumerical = {}; };
       user.users = [ "chn" "xll" "zem" "yjq" "gb" "wp" "hjp" "wm" "GROUPIII-1" "GROUPIII-2" "GROUPIII-3" "zgq" ];
diff --git a/devices/srv2/default.nix b/devices/srv2/default.nix
index 21e371ef..c19b9dc8 100644
--- a/devices/srv2/default.nix
+++ b/devices/srv2/default.nix
@@ -74,6 +74,7 @@ inputs:
             ];
           };
         };
+        mariadb.mountFrom = "nodatacow";
       };
       packages = { vasp = {}; desktop = {}; };
       user.users =
diff --git a/modules/services/mariadb.nix b/modules/services/mariadb.nix
index 566ee4ae..bc98a363 100644
--- a/modules/services/mariadb.nix
+++ b/modules/services/mariadb.nix
@@ -13,6 +13,7 @@ inputs:
       };}));
       default = {};
     };
+    mountFrom = mkOption { type = types.nullOr types.nonEmptyStr; default = null; };
   };
   config = let inherit (inputs.config.nixos.services) mariadb; in inputs.lib.mkIf mariadb.enable
   {
@@ -30,7 +31,7 @@ inputs:
       };
       mysqlBackup =
       {
-        enable = true;
+        enable = mariadb.mountFrom == "nodatacow";
         singleTransaction = true;
         databases = builtins.map (db: db.value.database) (inputs.localLib.attrsToList mariadb.instances);
       };
@@ -49,7 +50,10 @@ inputs:
     nixos.system.sops.secrets = builtins.listToAttrs (builtins.map
       (db: { name = "mariadb/${db.value.user}"; value.owner = inputs.config.users.users.mysql.name; })
       (builtins.filter (db: db.value.passwordFile == null) (inputs.localLib.attrsToList mariadb.instances)));
-    environment.persistence."/nix/nodatacow".directories =
-      [{ directory = "/var/lib/mysql"; user = "mysql"; group = "mysql"; mode = "0750"; }];
+    environment.persistence = inputs.lib.mkIf (mariadb.mountFrom != null)
+    {
+      "/nix/${mariadb.mountFrom}".directories =
+        [{ directory = "/var/lib/mysql"; user = "mysql"; group = "mysql"; mode = "0750"; }];
+    };
   };
 }