/// <summary>
/// Handles a specific file along with a group of files already seen with the same size.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="configuration">The configuration.</param>
/// <param name="stats">The statistics.</param>
/// <param name="knownWithThisLength">Length of the known with this.</param>
private static void _HandleFileWithGivenSize(
FileInfo item,
Configuration configuration,
RuntimeStats stats,
ConcurrentDictionary <string, FileEntry> knownWithThisLength)
{
var myKey = _GenerateKey(item);
var checksum = knownWithThisLength.GetOrAdd(myKey, new FileEntry(item));
var isHardLink = false;
IEnumerable <FileInfo> hardlinks;
try {
hardlinks = item.GetHardLinkTargets();
} catch (Exception e) {
_RemoveFileEntry(item, knownWithThisLength);
Console.WriteLine($"[Error] Could not enumerate HardLinks {item.FullName}: {e.Message}");
return;
}
foreach (var target in hardlinks)
{
isHardLink = true;
knownWithThisLength.TryAdd(_GenerateKey(target), new FileEntry(target));
}
if (isHardLink)
{
stats.HardLinkStats.IncreaseSeen();
if (configuration.ShowInfoOnly)
{
return;
}
_HandleExistingHardLink(item, configuration, stats, knownWithThisLength);
return;
}
string symlink;
try {
symlink = item.GetSymbolicLinkTarget();
} catch (Exception e) {
_RemoveFileEntry(item, knownWithThisLength);
Console.WriteLine($"[Error] Could not enumerate SymLink {item.FullName}: {e.Message}");
return;
}
if (symlink != null)
{
knownWithThisLength.TryAdd(symlink, new FileEntry(new FileInfo(symlink)));
stats.SymbolicLinkStats.IncreaseSeen();
if (configuration.ShowInfoOnly)
{
return;
}
_HandleExistingSymbolicLink(item, configuration, stats, knownWithThisLength);
return;
}
if (configuration.ShowInfoOnly)
{
return;
}
// find matching file in seen list and try to hard or symlink
var sameFiles =
knownWithThisLength
.Where(kvp => kvp.Key != myKey)
.Where(kvp => kvp.Value.Equals(checksum))
.Select(kvp => kvp.Key)
;
foreach (var sameFile in sameFiles)
{
var temporaryFile = _CreateTemporaryFileInSameDirectory(item);
temporaryFile.Delete();
var isSymlink = false;
try {
LinkExtensions.CreateHardLinkFrom((FileInfo)temporaryFile, (string)sameFile);
} catch (Exception e1) {
if (configuration.AlsoTrySymbolicLinks)
{
isSymlink = true;
try {
LinkExtensions.CreateSymbolicLinkFrom((FileInfo)temporaryFile, (string)sameFile);
} catch (Exception e2) {
Console.WriteLine(
$"[Warning] Could not Symlink {item.FullName}({FilesizeFormatter.FormatUnit(item.Length, true)}) --> {sameFile}: {e2.Message}");
continue;
}
}
else
{
Console.WriteLine(
$"[Warning] Could not Hardlink {item.FullName}({FilesizeFormatter.FormatUnit(item.Length, true)}) --> {sameFile}: {e1.Message}");
continue;
}
}
var isAlreadyDeleted = false;
try {
item.Attributes &= ~FileAttributes.ReadOnly;
item.Delete();
isAlreadyDeleted = true;
File.Move(temporaryFile.FullName, item.FullName);
} catch {
if (isAlreadyDeleted)
{
// undo file deletion
temporaryFile.CopyTo(item.FullName, true);
}
else
{
// undo temp file creation
temporaryFile.Delete();
}
throw;
}
if (isSymlink)
{
stats.SymbolicLinkStats.IncreaseCreated();
if (configuration.SetReadOnlyAttributeOnNewSymbolicLinks)
{
item.Attributes |= FileAttributes.ReadOnly;
}
}
else
{
stats.HardLinkStats.IncreaseCreated();
if (configuration.SetReadOnlyAttributeOnNewHardLinks)
{
item.Attributes |= FileAttributes.ReadOnly;
}
}
Console.WriteLine($"[Info] Created {(isSymlink ? "Symlink" : "Hardlink")} for {item.FullName}({FilesizeFormatter.FormatUnit(item.Length, true)}) --> {sameFile}");
return;
}
}