/// <summary>
/// Creates a stream for writing an extracted file to the filesystem.
/// </summary>
/// <param name="relativePath">A path relative to the archive's root.</param>
/// <param name="executable"><see langword="true"/> if the file's executable bit is set; <see langword="false"/> otherwise.</param>
/// <returns>A stream for writing the extracted file.</returns>
protected FileStream OpenFileWriteStream([NotNull] string relativePath, bool executable = false)
{
CancellationToken.ThrowIfCancellationRequested();
string fullPath = CombinePath(relativePath);
string directoryPath = Path.GetDirectoryName(fullPath);
if (directoryPath != null && !Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}
bool alreadyExists = File.Exists(fullPath);
var stream = File.Create(fullPath);
// If a symlink is overwritten by a normal file, remove the symlink flag
if (alreadyExists)
{
string flagRelativePath = string.IsNullOrEmpty(Destination) ? relativePath : Path.Combine(Destination, relativePath);
FlagUtils.Remove(Path.Combine(TargetDir, FlagUtils.SymlinkFile), flagRelativePath);
}
if (executable)
{
SetExecutableBit(relativePath);
}
else if (alreadyExists)
{
RemoveExecutableBit(relativePath); // If an executable file is overwritten by a non-executable file, remove the xbit flag
}
return(stream);
}
/// <summary>
/// Marks a file as no longer executable using the filesystem if possible, an <see cref="FlagUtils.XbitFile"/> file otherwise.
/// </summary>
/// <param name="relativePath">A path relative to the archive's root.</param>
private void RemoveExecutableBit(string relativePath)
{
#region Sanity checks
if (string.IsNullOrEmpty(relativePath))
{
throw new ArgumentNullException("relativePath");
}
#endregion
if (_isUnixFS)
{
FileUtils.SetExecutable(Path.Combine(EffectiveTargetDir, relativePath), false);
}
else
{
// Non-Unixoid OSes (e.g. Windows) can't store the executable flag directly in the filesystem; remember in a text-file instead
string flagRelativePath = string.IsNullOrEmpty(Destination) ? relativePath : Path.Combine(Destination, relativePath);
FlagUtils.Remove(Path.Combine(TargetDir, FlagUtils.XbitFile), flagRelativePath);
}
}
