From 3f281f1980305b060b2bd67b455057395367bd07 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Thu, 3 Sep 2026 22:21:07 -0400
Subject: [PATCH] Clean up nix_builder directories at the start of a build.

---
 nix/configuration/flake.lock              | 8 ++++----
 nix/configuration/roles/hydra/default.nix | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/nix/configuration/flake.lock b/nix/configuration/flake.lock
index 06be7de..507d23b 100644
--- a/nix/configuration/flake.lock
+++ b/nix/configuration/flake.lock
@@ -170,11 +170,11 @@
         "rust-overlay": "rust-overlay_2"
       },
       "locked": {
-        "lastModified": 1785893730,
-        "narHash": "sha256-K3pjEDafWrpfC1dc14icLxx9tWx4c/dfKTeiDYoZU7Q=",
+        "lastModified": 1788488145,
+        "narHash": "sha256-s1UY+kbLtb+5ye4GnE/HKh0idUQ0iiIkMMtGI7cDRHk=",
         "ref": "refs/heads/main",
-        "rev": "83f05b36778dd90d4e15e0d020685d9388cbaea1",
-        "revCount": 39,
+        "rev": "8b28dfb583e094f52fd6ab70c709cc1981d8853d",
+        "revCount": 46,
         "type": "git",
         "url": "https://code.fizz.buzz/talexander/nix_builder.git"
       },
diff --git a/nix/configuration/roles/hydra/default.nix b/nix/configuration/roles/hydra/default.nix
index a9a23cd..fc72b40 100644
--- a/nix/configuration/roles/hydra/default.nix
+++ b/nix/configuration/roles/hydra/default.nix
@@ -100,6 +100,7 @@
           IFS=$'\n\t'
           DIR="$( cd "$( dirname "''${BASH_SOURCE[0]}" )" && pwd )"
 
+          NIX_REMOTE='local?root=/.disk/root' RUST_BACKTRACE=1 RUST_LOG=nix_builder=DEBUG ${nix_builder.packages.x86_64-linux.default}/bin/nix-builder clean --config ${./files/nix_builder.toml}
           NIX_REMOTE='local?root=/.disk/root' RUST_BACKTRACE=1 RUST_LOG=nix_builder=DEBUG ${nix_builder.packages.x86_64-linux.default}/bin/nix-builder build --config ${./files/nix_builder.toml} ${builtins.concatStringsSep " " build_flags}
         '';
         restartIfChanged = false;