ci: Disable GPU for CI ui-tests

Author: tzanko-matev

.agents/codebase-insights.txt

@@ -38,3 +38,4 @@
 - `!tup_preserve` only mirrors files relative to the directory containing the Tupfile; after moving Tupfiles into `src/build` we copy assets with the new `!cp_preserve` helper so files can originate from the original `src/` tree without confusing tup.
 - `!cp_preserve` replaces symlink sources with fresh links pointing at the original target (using `readlink -f`) so mirrored assets stay valid when their relative paths shift.
 - `ct_wrapper` resolves `ct_paths.json` by honouring `CODETRACER_CT_PATHS` and otherwise searching upward from both the binary location and the current working directory, so it no longer assumes the wrapper lives at a specific depth in the checkout.
+- The posix `wrapElectron` path (used when `CODETRACER_WRAP_ELECTRON=1`) now forwards `CODETRACER_ELECTRON_ARGS`, so CI overrides like `--no-sandbox` reach Electron even when we re-exec the wrapper. The Playwright launcher preserves any existing value and only appends `--no-sandbox` if it is missing, so CI scripts can layer additional flags (e.g. `--disable-gpu`).

ci/test/ui-tests.sh

@@ -27,7 +27,7 @@ CODETRACER_E2E_CT_PATH="$(pwd)/src/build/bin/ct"
 LINKS_PATH_DIR="$(pwd)/src/build"
 NIX_CODETRACER_EXE_DIR="$(pwd)/src/build"
 CODETRACER_LINKS_PATH="$(pwd)/src/build"
-CODETRACER_ELECTRON_ARGS="--no-sandbox"
+CODETRACER_ELECTRON_ARGS="--no-sandbox --disable-gpu"
 
 export CODETRACER_E2E_CT_PATH
 export LINKS_PATH_DIR

ui-tests/Helpers/PlayrwightLauncher.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Diagnostics;
 using Microsoft.Playwright;
 using UiTests.Helpers;
@@ -55,6 +56,14 @@ public static async Task<IBrowser> LaunchAsync(string programRelativePath)
         info.EnvironmentVariables.Add("CODETRACER_TEST", "1");
         info.EnvironmentVariables.Add("CODETRACER_WRAP_ELECTRON", "1");
         info.EnvironmentVariables.Add("CODETRACER_START_INDEX", "1");
+        const string electronArgsKey = "CODETRACER_ELECTRON_ARGS";
+        var existingElectronArgs = info.EnvironmentVariables[electronArgsKey];
+        var sanitizedElectronArgs = string.IsNullOrWhiteSpace(existingElectronArgs)
+            ? "--no-sandbox"
+            : existingElectronArgs.Contains("--no-sandbox", StringComparison.Ordinal)
+                ? existingElectronArgs
+                : $"{existingElectronArgs} --no-sandbox";
+        info.EnvironmentVariables[electronArgsKey] = sanitizedElectronArgs;
         // info.EnvironmentVariables.Add("CODETRACER_DEV_TOOLS", "");
 
         var process = Process.Start(info)!;
@@ -103,4 +112,4 @@ public static async Task<IPage> GetAppPageAsync(IBrowser browser, string? titleC
             throw new TimeoutException("Could not find app page (non-DevTools) after connecting playwright.");
         }
     }
-}
+}