checkBinstubSdk function

BinstubSdkMismatch? checkBinstubSdk(BinstubSdkCheckInput input)

Returns the mismatch when fdb runs from a global activation and PUB_CACHE/bin/fdb hardcodes another SDK's snapshot; otherwise null. Reads files only; never throws.

Implementation

BinstubSdkMismatch? checkBinstubSdk(BinstubSdkCheckInput input) {
  try {
    final pubCache = input.pubCacheDir;
    final running = input.runningDartVersion;
    if (input.isWindows || pubCache == null || running.isEmpty) return null;
    if (!_isUnder(input.scriptPath, '$pubCache/global_packages/fdb/')) return null;

    final lines = File('$pubCache/bin/fdb').readAsLinesSync();
    if (!lines.any((l) => l.trim() == '# Package: fdb')) return null;
    if (lines.any((l) => l.trim() == launcherMarker)) return null;
    final activated = lines.map(_snapshotRef.firstMatch).nonNulls.firstOrNull?.group(1);
    if (activated == null || activated == running) return null;
    return (activated: activated, running: running);
  } catch (_) {
    return null; // Missing/unreadable launcher — nothing to report.
  }
}