/// <summary>
/// Backup a file, using the SIS principle: if the file exists already in the previous backup,
/// create a hardlink instead of making another copy.
/// </summary>
/// <param name="fileToBackup"> Full path to the file to backuped </param>
/// <param name="fileToBackupTo"> Base directory to backup to </param>
/// <param name="BaseDirPrevBackup"> Base directory of the previous backup </param>
/// <returns> true if the file was actualy copied, false if the file didn't change since a previous backup </returns>
private Boolean BackupFile(FileInfo fileToBackup, FileInfo fileToBackupTo, FileInfo prevBackupFile)
{
Boolean fileChanged = false;
try
{
// Check if the file was backed up in the previous backup and wasn't changed afterwards,
// to create a hardlink rather then copying the file again.
if (prevBackupFile.Exists && IOHelper.Compare(prevBackupFile, fileToBackup, false))
{
fileChanged = false;
if (OnlySimulate != true)
{
IOHelper.CreateHardLink(fileToBackupTo.FullName, prevBackupFile.FullName);
}
Log.Debug("HARDLINK " + fileToBackupTo.FullName + " TO " + prevBackupFile + " (= previous backup");
}
else
{
fileChanged = true;
if (OnlySimulate != true)
{
File.Copy(fileToBackup.FullName, fileToBackupTo.FullName);
}
Log.Debug("COPY " + fileToBackup + " TO " + fileToBackupTo.FullName);
if (prevBackupFile.Exists)
{
ReportToFile("CHANGED - " + fileToBackupTo.FullName);
}
else
{
ReportToFile("NEW - " + fileToBackupTo.FullName);
}
}
}
catch (Exception ex)
{
Log.Error(fileToBackup + " TO " + fileToBackupTo.FullName + ": " + ex.Message);
}
return(fileChanged);
}
