From 76cab3901e291a56ee8eafb7c034fa14fed89719 Mon Sep 17 00:00:00 2001
From: Alan Agius <17563226+alan-agius4@users.noreply.github.com>
Date: Fri, 13 Mar 2026 12:50:09 +0000
Subject: [PATCH] fix(github-actions): use stable TMPDIR for rules_sass
 compiler compilation

Forcing a stable temporary directory prevents the Dart compiler on macOS from embedding random absolute paths into the compiled binaries.

Previously, the random temp paths (e.g., /var/folders/.../random_hash/snapshot.aot)
caused the binaries to differ on every build run even when the source code was identical. Using a workspace-relative TMPDIR ensures deterministic binary output.
---
 .github/workflows/rules_sass-compiler-updates.yml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/rules_sass-compiler-updates.yml b/.github/workflows/rules_sass-compiler-updates.yml
index 2fe5de5cd..75317cb74 100644
--- a/.github/workflows/rules_sass-compiler-updates.yml
+++ b/.github/workflows/rules_sass-compiler-updates.yml
@@ -29,7 +29,14 @@ jobs:
       - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c # v1
       - run: dart pub get --enforce-lockfile
       - run: mkdir -p src/compiler/built/
-      - run: dart compile exe src/compiler/bin/x_sass.dart -o src/compiler/built/${{ matrix.bin_name }}
+
+      # To fix the non-deterministic build problem on macOS, force the Dart compiler to use a stable,
+      # non-random temporary directory during compilation. By default, macOS uses a random subfolder in /var/folders/...,
+      # but we can override this by setting the TMPDIR environment variable to a fixed path within the workspace.
+      - run: |
+          mkdir -p .dart_tmp
+          export TMPDIR="$(pwd)/.dart_tmp"
+          dart compile exe src/compiler/bin/x_sass.dart -o src/compiler/built/${{ matrix.bin_name }}
       - uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: ${{ matrix.bin_name }}