2026 OpenClaw Field Guide: GOPROXY Probes, Fallback Scripts & CI Log Surfacing

Module fetches are a stack of DNS, TCP, TLS, HTTP, and cache behaviors. On Apple Silicon runners that share uplink with desktop automation, a spike in concurrent pulls can starve the first proxy hop even when fallback mirrors are healthy. Certificate stores can diverge between login shells and service accounts, which surfaces as TLS handshake errors that look like “bad module path.”

When OpenClaw or companion bots trigger builds, you want the host to be in a known-good state before Go runs. That is why we treat openclaw doctor as part of the same preflight family as go env: both expose PATH, permission, and networking assumptions the module step inherits. For gateway patrol patterns, see LaunchAgent health checks; for broader retry philosophy, skim failure recovery and retry.

Execute top to bottom on a staging Mac before you promote the same plist and CI YAML to production runners.

• Install baseline. Node 22 or newer, OpenClaw CLI available on the service user PATH, non-interactive npm or official installer—no sudo prompts in CI.
• Onboard and doctor. Run openclaw onboard once per machine image, then openclaw doctor; resolve every warning about permissions, missing CLIs, or config paths.
• Go toolchain parity. Pin go version across images; print go env GOPROXY GOPRIVATE GONOPROXY GOSUMDB GOMODCACHE at job start.
• Probe before export. Hit each GOPROXY base URL with curl using explicit timeouts; record HTTP status and wall time in the job log.
• Wrap downloads. Run go mod download inside a script that can switch chains and cap total attempts—never bare commands in opaque wrappers.
• Daemon optional. If the Mac should self-heal between CI jobs, install a LaunchAgent that runs the probe on an interval with ThrottleInterval to avoid tight crash loops.
• Log hygiene. Tee verbose module output to $RUNNER_TEMP/gomod.log or equivalent; scrub bearer tokens before upload.
• Escalation thresholds. Alert when two consecutive probe cycles fail five minutes apart, or when go mod download exhausts two full chain rotations in a single job.

The probe below treats HTTP 200–499 except timeouts as a signal the TCP/TLS path works; tune the sample path for your mirror vendor. Backoff follows 2s, 4s, 8s with three tries per URL—about twenty-five seconds worst case per hop, which is usually cheaper than a failed CI run.

#!/usr/bin/env bash
set -euo pipefail
# goproxy-probe.sh — returns first healthy base URL or exits 1
CANDIDATES=(
  "https://corp-go.example.com"
  "https://goproxy.cn"
  "https://proxy.golang.org"
)
probe_one() {
  local url="$1" attempt=1 delay=2
  while [[ $attempt -le 3 ]]; do
    if curl -fsS --connect-timeout 8 --max-time 20 -o /dev/null \
        "$url/github.com/golang/glog/@v/v1.2.0.info" \
        || curl -fsS --connect-timeout 8 --max-time 20 -o /dev/null "$url/"; then
      echo "$url"
      return 0
    fi
    sleep "$delay"
    delay=$(( delay * 2 ))
    attempt=$(( attempt + 1 ))
  done
  return 1
}
for c in "${CANDIDATES[@]}"; do
  if base=$(probe_one "$c"); then
    echo "GOPROXY_PRIMARY=$base"
    exit 0
  fi
done
echo "all GOPROXY candidates failed" >&2
exit 1

Wrapper sketch: resolve GOPROXY_PRIMARY, export GOPROXY="$GOPROXY_PRIMARY,https://proxy.golang.org,direct" (adjust for policy), run go mod download; on failure print go env -json | jq if available, then second chain; stop after two rotations.

#!/usr/bin/env bash
set -euo pipefail
LOG="${RUNNER_TEMP:-/tmp}/gomod-$(date +%s).log"
export GOPROXY="$(./goproxy-probe.sh | sed -n 's/^GOPROXY_PRIMARY=//p'),https://proxy.golang.org,direct"
echo "Using GOPROXY=$GOPROXY" | tee -a "$LOG"
if ! go mod download -x 2>&1 | tee -a "$LOG"; then
  export GOPROXY="https://proxy.golang.org,direct"
  echo "Fallback GOPROXY=$GOPROXY" | tee -a "$LOG"
  go mod download -x 2>&1 | tee -a "$LOG"
fi

if [[ -n "${GITHUB_STEP_SUMMARY:-}" ]]; then
  {
    echo "### go mod fetch"
    echo '```'
    tail -n 40 "$LOG"
    echo '```'
  } >> "$GITHUB_STEP_SUMMARY"
fi

Automation does not replace policy: keep GOPRIVATE and GONOPROXY aligned with compliance before you widen public chains. The matrix article linked above spells out those pairings.

Treat GOPROXY like any other flaky dependency: probe with timeouts, retry with a capped backoff, export a winning chain inside the same execution context as go mod download, and echo the evidence back to CI. Layer that on top of a clean OpenClaw baseline so automation and builds share one predictable host profile.