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Always refresh Retro-WFC payload with fallback

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patchzyy
2026-09-28 20:41:51 +02:00
parent 82991ec337
commit 28a24ea49d
3 changed files with 56 additions and 22 deletions
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Launcher/WiiCompiled.Setup.Linux/Program.cs
+28 -7
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@@ -127,19 +127,40 @@ internal static class Program
string? retroWfcOfflineDir = null;
if (downloadPayload)
{
// Reused if a previous install already downloaded and it's still valid - matches
// Windows's own reuse-if-valid behavior instead of re-downloading on every install.
var cacheDir = Path.Combine(workspace, "generated", "retro-wfc-payload");
reporter.Progress(InstallStages.Validate, "Preparing the Retro-WFC payload", 1);
reporter.Progress(InstallStages.Validate,
"Downloading the current Retro-WFC payload", 1);
try
{
RetroWfcPayload.ValidateStagedRetroWfcPayloadDirectory(cacheDir);
}
catch (InvalidDataException)
{
// A valid signature authenticates a payload, but does not prove it is the latest
// signed revision. Always ask the fixed endpoint for the current snapshot; the
// downloader verifies it before atomically replacing the cache.
await RetroWfcPayload.DownloadRetroWfcPayloadAsync(
RetroWfcPayload.CurrentRetroWfcPayloadUri, cacheDir, token);
}
catch (Exception downloadFailure) when (!token.IsCancellationRequested &&
downloadFailure is HttpRequestException or TimeoutException
or IOException)
{
// Offline installs may continue with a previously authenticated snapshot. Do not
// use this path for a newly downloaded payload that failed signature validation:
// that must remain a hard failure instead of hiding possible endpoint tampering.
try
{
RetroWfcPayload.ValidateStagedRetroWfcPayloadDirectory(cacheDir);
}
catch (Exception cacheFailure) when (cacheFailure is IOException or
UnauthorizedAccessException or InvalidDataException)
{
throw new InvalidOperationException(
"The current Retro-WFC payload could not be downloaded and no valid cached " +
$"payload is available ({cacheFailure.Message.TrimEnd('.')}).", downloadFailure);
}
reporter.Diagnostic(
"The current Retro-WFC payload could not be downloaded; using the previously " +
$"verified cached payload instead ({downloadFailure.Message.TrimEnd('.')}).");
}
retroWfcOfflineDir = cacheDir;
}