/// <summary>
/// Try to link to an existing central name file.
/// If the central name file exist, and the link limit is not exceeded, the destination file is linked to the central name file, and the return value is true.
/// In this case, the backup of the destination file is considered finished.
/// If the central name file does not exist, or linking fails due to an exceeded link limit, the return value is false.
/// </summary>
/// <returns>True if linking of the destination file to the existing central name file succeeded;, otherwise, false.</returns>
/// <exception cref="System.IO.IOException">Error creating hard link from {_centralNameFileName} to {_destinationFileName}, ErrorCode: {hlr}</exception>
public bool TryToLinkToExistingNameFile()
{
var fileInfoCentralNameFileName = new FileInfo(_centralNameFileName);
// Compare the FileInfo of the central name file with the FileInfo of the source file
// only if both match, we can link the destination file name to the centralNameFile
if (fileInfoCentralNameFileName.Exists && FileUtilities.AreMetaDataMatching(fileInfoCentralNameFileName, _sourceFile))
{
var hlr = FileUtilities.CreateHardLink(_centralNameFileName, _destinationFileName);
if (hlr == 0)
{
return(true);
}
else
{
if (hlr != FileUtilities.ERROR_TOO_MANY_LINKS) // ignore TooManyLinks error, instead let the content file be created anew
{
throw new System.IO.IOException($"Error creating hard link from {_centralNameFileName} to {_destinationFileName}, ErrorCode: {hlr}");
}
}
}
return(false);
}