private static uint ChangeUserId(uint userId)
{
var oldId = UnixInterop.setfsuid(userId);
if (oldId == userId)
{
return(oldId);
}
// This will always fail and is required, because no
// error status gets set by this function.
var currentId = UnixInterop.setfsuid(uint.MaxValue);
if (currentId != userId)
{
if (currentId != oldId)
{
UnixInterop.setfsuid(oldId);
}
throw new InvalidOperationException();
}
// Set again, because WSL seems to be buggy and accepts
// uint.MaxValue even though it's not a valid user id.
UnixInterop.setfsuid(userId);
return(oldId);
}
/// <inheritdoc />
public void Dispose()
{
if (_hasUserInfo)
{
var restoreUid = _defaultUserId;
var restoreGid = _defaultGroupId;
var prevGid = UnixInterop.setfsgid(restoreGid);
var prevUid = UnixInterop.setfsuid(restoreUid);
if (prevUid != _setUserId || prevGid != _setGroupId)
{
_logger?.LogWarning(
"Reverted to user id={oldUserId} (was set to: {prevUserId}) and group id={oldGroupId} (was set to: {prevGroupId})",
restoreUid,
prevUid,
restoreGid,
prevGid);
}
}
}
