/// <nodoc />
private async Task <EvaluationResult> CheckIfExtractIsNeededAsync(PipConstructionHelper pipConstructionHelper, DownloadData downloadData)
{
try
{
if (m_context.FileSystem.IsDirectory(downloadData.ContentsFolder))
{
var incrementalState = await ExtractIncrementalState.TryLoadAsync(m_logger, m_context, downloadData);
if (incrementalState != null)
{
// Check all files still have the same hash. This should use the hash cache based on USN so be very fast.
foreach (var hashKv in incrementalState.Hashes)
{
if (!m_context.FileSystem.Exists(hashKv.Key))
{
// File is not present, extraction is needed.
return(EvaluationResult.Continue);
}
var hash = await GetContentHashAsync(hashKv.Key);
if (hash != hashKv.Value)
{
// File has changed, extraction is needed.
return(EvaluationResult.Continue);
}
}
// All hashes verified, update the manifest
await incrementalState.SaveAsync(m_context);
return(SealDirectory(pipConstructionHelper, downloadData, downloadData.ContentsFolder, incrementalState.Files));
}
}
}
catch (IOException e)
{
m_logger.ErrorCheckingIncrementality(m_context.LoggingContext, downloadData.Settings.ModuleName, e.Message);
return(EvaluationResult.Error);
}
catch (UnauthorizedAccessException e)
{
m_logger.ErrorCheckingIncrementality(m_context.LoggingContext, downloadData.Settings.ModuleName, e.Message);
return(EvaluationResult.Error);
}
// Extraction is needed
return(EvaluationResult.Continue);
}
