From e9d95c3bd6932e3d6537cfd6dbe05d1bda790bd5 Mon Sep 17 00:00:00 2001
From: codex <codex@bstein.dev>
Date: Sat, 3 Oct 2026 02:05:27 -0500
Subject: [PATCH] ci: pin resolved Go toolchain during coverage checks

---
 scripts/quality_gate.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/quality_gate.sh b/scripts/quality_gate.sh
index 9747556..5f264cc 100755
--- a/scripts/quality_gate.sh
+++ b/scripts/quality_gate.sh
@@ -157,6 +157,11 @@ quality_gate_finalize() {
 trap 'quality_gate_finalize $?' EXIT
 
 cd "${REPO_DIR}"
+# Pin the resolved toolchain for child coverage commands. Auto-switching from an
+# older host Go can otherwise look for the removed covdata tool (Go issue 75031).
+if [[ "$(go env GOTOOLCHAIN)" == "auto" ]]; then
+  export GOTOOLCHAIN="$(go env GOVERSION)"
+fi
 mkdir -p "${BUILD_DIR}"
 rm -f "${COVERAGE_PROFILE}" "${COVERAGE_PERCENT_FILE}"
 printf 'failed\n' > "${BUILD_DIR}/docs-naming.status"