/// <inheritdoc/>
public override async Task <ContentHash> GetFileContentHashAsync(string path, bool trackFile = true, HashType hashType = HashType.Unknown)
{
// If the tracker knows about this file, then we already have the hash
ContentHash hash;
if (trackFile)
{
if (m_inputTracker.TryGetHashForUnchangedFile(path, out hash))
{
return(hash);
}
}
using (
var fs = FileUtilities.CreateFileStream(
path,
FileMode.Open,
FileAccess.Read,
FileShare.Delete | FileShare.Read,
FileOptions.SequentialScan))
{
// Otherwise, check if the file content table already knows about this
var fileContentTable = m_getFileContentTable();
VersionedFileIdentityAndContentInfo?maybeKnownIdentityAndHash = fileContentTable.TryGetKnownContentHash(fs);
if (maybeKnownIdentityAndHash?.FileContentInfo.MatchesHashType(hashType) ?? false)
{
return(maybeKnownIdentityAndHash.Value.FileContentInfo.Hash);
}
// Finally, if all the above failed, compute the hash and record it for next time
hash = await ContentHashingUtilities.HashContentStreamAsync(fs, hashType);
maybeKnownIdentityAndHash = fileContentTable.RecordContentHash(fs, hash);
m_specCache?.AddFile(fs, maybeKnownIdentityAndHash.Value.FileContentInfo.Hash, path);
m_inputTracker.RegisterFileAccess(fs.SafeFileHandle, path, maybeKnownIdentityAndHash.Value);
return(hash);
}
}
private void AddFile(FileCombiner combiner, FakeFile fakeFile)
{
combiner.AddFile(fakeFile.Content, fakeFile.Hash, fakeFile.Path);
}