🚀 postgresqlBackups (finally)

hosts/plato/configuration.nix

@@ -10,6 +10,7 @@
     ../../modules/home-assistant
     ../../modules/matrix
     ../../modules/pleroma
+    ../../modules/postgresql
     ../../modules/sops
   ];
 

modules/gitea/default.nix

@@ -12,7 +12,8 @@ in
   };
   users.groups.git = { };
 
-  services.gitea = {
+  services = {
+    gitea = {
       enable = true;
       user = "git";
       domain = "walkah.dev";
@@ -39,4 +40,6 @@ in
         user = "git";
       };
     };
+    postgresqlBackup.databases = [ "gitea" ];
+  };
 }

modules/home-assistant/postgresql.nix

@@ -9,5 +9,6 @@
         ensurePermissions = { "DATABASE hass" = "ALL PRIVILEGES"; };
       }];
     };
+    postgresqlBackup.databases = [ "hass" ];
   };
 }

modules/matrix/default.nix

@@ -13,6 +13,7 @@
             LC_CTYPE = "C";
       '';
     };
+    postgresqlBackup.databases = [ "matrix" ];
 
     matrix-synapse = {
       enable = true;

modules/pleroma/default.nix

@@ -13,5 +13,6 @@
         ensurePermissions = { "DATABASE pleroma" = "ALL PRIVILEGES"; };
       }];
     };
+    postgresqlBackup.databases = [ "pleroma" ];
   };
 }

modules/postgresql/default.nix

@@ -0,0 +1,38 @@
+{ pkgs, config, ... }: {
+  services = {
+    postgresql = {
+      enable = true;
+    };
+
+    postgresqlBackup = {
+      enable = true;
+    };
+  };
+
+  # Postgres upgrades: https://nixos.org/manual/nixos/stable/index.html#module-services-postgres-upgrading
+  environment.systemPackages = [
+    (pkgs.writeScriptBin "upgrade-pg-cluster" ''
+      set -eux
+      # XXX it's perhaps advisable to stop all services that depend on postgresql
+      systemctl stop postgresql
+
+      # XXX replace `<new version>` with the psqlSchema here
+      export NEWDATA="/var/lib/postgresql/11.1"
+
+      # XXX specify the postgresql package you'd like to upgrade to
+      export NEWBIN="${pkgs.postgresql_12}/bin"
+
+      export OLDDATA="${config.services.postgresql.dataDir}"
+      export OLDBIN="${config.services.postgresql.package}/bin"
+
+      install -d -m 0700 -o postgres -g postgres "$NEWDATA"
+      cd "$NEWDATA"
+      sudo -u postgres $NEWBIN/initdb -D "$NEWDATA"
+
+      sudo -u postgres $NEWBIN/pg_upgrade \
+        --old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
+        --old-bindir $OLDBIN --new-bindir $NEWBIN \
+        "$@"
+    '')
+  ];
+}