internal void Shadow(string id)
{
// note: no thread-safety here, because ShadowFs is thread-safe due to the check
// on ShadowFileSystemsScope.None - and if None is false then we should be running
// in a single thread anyways
var virt = Path.Combine(ShadowFsPath, id, _shadowPath);
_shadowDir = _hostingEnvironment.MapPathContentRoot(virt);
Directory.CreateDirectory(_shadowDir);
var tempfs = new PhysicalFileSystem(_ioHelper, _hostingEnvironment, _loggerFactory.CreateLogger <PhysicalFileSystem>(), _shadowDir, _hostingEnvironment.ToAbsolute(virt));
_shadowFileSystem = new ShadowFileSystem(_innerFileSystem, tempfs);
}
internal void UnShadow(bool complete)
{
var shadowFileSystem = _shadowFileSystem;
var dir = _shadowDir;
_shadowFileSystem = null;
_shadowDir = null;
try
{
// this may throw an AggregateException if some of the changes could not be applied
if (complete)
{
shadowFileSystem.Complete();
}
}
finally
{
// in any case, cleanup
try
{
Directory.Delete(dir, true);
// shadowPath make be path/to/dir, remove each
dir = dir.Replace('/', Path.DirectorySeparatorChar);
var min = _hostingEnvironment.MapPathContentRoot(ShadowFsPath).Length;
var pos = dir.LastIndexOf(Path.DirectorySeparatorChar);
while (pos > min)
{
dir = dir.Substring(0, pos);
if (Directory.EnumerateFileSystemEntries(dir).Any() == false)
{
Directory.Delete(dir, true);
}
else
{
break;
}
pos = dir.LastIndexOf(Path.DirectorySeparatorChar);
}
}
catch
{
// ugly, isn't it? but if we cannot cleanup, bah, just leave it there
}
}
}