From 9c67146eef60ae8537f2ec41747c72366dd34bbd Mon Sep 17 00:00:00 2001
From: Yuriy Taraday <yuriy.taraday@tweag.io>
Date: Fri, 31 Jul 2026 16:31:55 +0200
Subject: [PATCH] nixos/hydra: Add zstd to hydra-server's PATH

Without this, if compress_build_logs_compression is set to zstd we're
getting:

```
hydra-server[3594125]: sh: line 1: zstd: command not found
```

every time someone tries to fetch log file compressed with zstd.

(cherry picked from commit a057770de161b621cc4cb558504f193baaf7346b)
---
 .../services/continuous-integration/hydra/default.nix        | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nixos/modules/services/continuous-integration/hydra/default.nix b/nixos/modules/services/continuous-integration/hydra/default.nix
index 2fd38e50459d..f03b9c2c3240 100644
--- a/nixos/modules/services/continuous-integration/hydra/default.nix
+++ b/nixos/modules/services/continuous-integration/hydra/default.nix
@@ -398,6 +398,11 @@ in
       wantedBy = [ "multi-user.target" ];
       requires = [ "hydra-init.service" ];
       after = [ "hydra-init.service" ];
+      path = [
+        # these are used to serve logs if they are compressed with zstd or bzip2
+        pkgs.zstd
+        pkgs.bzip2
+      ];
       environment = serverEnv // {
         HYDRA_DBI = "${serverEnv.HYDRA_DBI};application_name=hydra-server";
       };