#!/usr/bin/env bash
#
# probe-e2e-fixtures.sh — reachability gate for the guarded v2-e2e workflow (#757).
#
# TCP-probes the shared fixture host's REQUIRED simulator ports. Prints `reachable=true|false` (and
# appends it to $GITHUB_OUTPUT when set). Exit status is always 0: an unreachable fleet is an expected,
# clean skip (the runner is off-VPN, the host is down), not a failure. Only the probe itself erring
# (bad usage) exits non-zero.
#
# Env: E2E_FIXTURE_HOST (default 10.100.0.35)
#      E2E_REQUIRED_PORTS (default "5020 1102 50000" = Modbus, S7, opc-plc)
#      E2E_PROBE_TIMEOUT (seconds per port, default 5)
set -uo pipefail
host="${E2E_FIXTURE_HOST:-10.100.0.35}"
ports="${E2E_REQUIRED_PORTS:-5020 1102 50000}"
t="${E2E_PROBE_TIMEOUT:-5}"
ok=true
for p in $ports; do
  if timeout "$t" bash -c "exec 3<>/dev/tcp/$host/$p" 2>/dev/null; then
    echo "probe: $host:$p open"
  else
    echo "probe: $host:$p UNREACHABLE"; ok=false
  fi
done
echo "reachable=$ok"
[ -n "${GITHUB_OUTPUT:-}" ] && echo "reachable=$ok" >> "$GITHUB_OUTPUT"
exit 0