Merge pull request #259849 from Scrumplex/nixos/vaultwarden/backupDirCreate

nixos/vaultwarden: create backupDir using tmpfiles.d

nixos/modules/services/security/vaultwarden/backup.sh

···
 #!/usr/bin/env bash
 
 # Based on: https://github.com/dani-garcia/vaultwarden/wiki/Backing-up-your-vault
-if ! mkdir -p "$BACKUP_FOLDER"; then
-  echo "Could not create backup folder '$BACKUP_FOLDER'" >&2
+if [ ! -d "$BACKUP_FOLDER" ]; then
+  echo "Backup folder '$BACKUP_FOLDER' does not exist" >&2
   exit 1
 fi
 

nixos/modules/services/security/vaultwarden/default.nix

···
       description = lib.mdDoc ''
         The directory under which vaultwarden will backup its persistent data.
       '';
+      example = "/var/backup/vaultwarden";
     };
 
     config = mkOption {
···
         Unit = "backup-vaultwarden.service";
       };
       wantedBy = [ "multi-user.target" ];
+    };
+
+    systemd.tmpfiles.settings = mkIf (cfg.backupDir != null) {
+      "10-vaultwarden".${cfg.backupDir}.d = {
+        inherit user group;
+        mode = "0770";
+      };
     };
   };