From cf2f5850e21416f809100ac734e9835bd8624eaf Mon Sep 17 00:00:00 2001
From: Silvan Mosberger <infinisil@icloud.com>
Date: Thu, 14 Feb 2019 18:27:48 +0100
Subject: [PATCH] nixos/znapzend: Run znapzendzetup import in parallel

Patch by @Baughn, who noticed these imports being very slow when run
serially with many datasets, so much that the service would time out and
fail, this fixes it.
---
 nixos/modules/services/backup/znapzend.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/nixos/modules/services/backup/znapzend.nix b/nixos/modules/services/backup/znapzend.nix
index fc8a424190f7..11b6215794ec 100644
--- a/nixos/modules/services/backup/znapzend.nix
+++ b/nixos/modules/services/backup/znapzend.nix
@@ -382,8 +382,10 @@ in
             | xargs -I{} ${pkgs.znapzend}/bin/znapzendzetup delete "{}"
         '' + concatStringsSep "\n" (mapAttrsToList (dataset: config: ''
           echo Importing znapzend zetup ${config} for dataset ${dataset}
-          ${pkgs.znapzend}/bin/znapzendzetup import --write ${dataset} ${config}
-        '') files);
+          ${pkgs.znapzend}/bin/znapzendzetup import --write ${dataset} ${config} &
+        '') files) + ''
+          wait
+        '';
 
         serviceConfig = {
           ExecStart = let