schmitch

How to use a TPM on Linux

Prerequisites

• I use it on Arch Linux
• Install dependency: yay tpm2-tools

Do I have a TPM 2.0?

kmille@linbox:~ journalctl --boot --dmesg --grep=tpm_tis

schmitch

using EnvisiaCms.Simple.Shared;
using Microsoft.AspNetCore.Routing.Matching;

namespace EnvisiaCms.Simple;

internal sealed class LocalPortMatcherPolicy : MatcherPolicy,
    IEndpointComparerPolicy,
    INodeBuilderPolicy
{
    public override int Order { get; } = -100;

schmitch

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Microsoft.EntityFrameworkCore;
using NodaTime;

AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);

await using ApplicationDbContext db = new();
await db.Database.EnsureDeletedAsync();
await db.Database.EnsureCreatedAsync();

schmitch

using System;
using System.Diagnostics;
using System.IO;

namespace ConsoleApp1
{
    /// <summary>
    /// Helper stream class to represent a slice of a larger stream to save memory when dealing with large streams
    /// and remove the extra copy operations
    /// This class is inspired from System.IO.Compression in dot net core. Reference implementation can be found here

schmitch

Converting a gitlab export to simple git repo

• Initial credit to https://gist.github.com/maxivak/513191447d15c4d30953006d99928658

Gitlab exports a tar.gz file which contains a file called project.bundle. We can convert this file into a normal git repo using the following steps:

Extract the project.bundle file

$ tar xvfz GitLabExport.gz

schmitch

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting.Builder;
using Microsoft.AspNetCore.Hosting.Server;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Routing;

schmitch

public class BackgroundQueuedHostedService : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
    {
           while (!cancellationToken.IsCancellationRequested)
           {
               var workItem = await TaskQueue.DequeueAsync(cancellationToken);
               await FastTask(); // 
               await Task.Factory.StartNew(
                                () => 

schmitch

Warning: Native image server limit exceeded. Use options --server{-list,-shutdown[-all]} to fix the problem.
   classlist:  13,304.29 ms
       (cap):   1,741.70 ms
       setup:   2,708.53 ms
    analysis:  35,828.31 ms
error: unsupported features in 2 methods
Detailed message:
Error: Must not have a FileDescriptor in the image heap.
Trace: 	object java.io.FileOutputStream
	object java.io.BufferedOutputStream

schmitch

import play.sbt.PlayRunHook
import sbt._
import java.net.InetSocketAddress

object Angular2 {
  def apply(log: Logger, base: File, target: File): PlayRunHook = {

    object Angular2Process extends PlayRunHook {

      private var watchProcess: Option[Process] = None

schmitch

/*
Outcome: c.schmitt - MacBook Pro (Retina, 15", Ende 2013) - macOS 10.12.1
sbt "jmh:run -i 10 -wi 10 -f1 -t1"
[info] Benchmark                                       Mode  Cnt         Score         Error  Units
[info] Main.testMethod                                thrpt   10  19538048,171 ± 2224217,470  ops/s
[info] Main.testMethodHandleIntSupplierUnreflect      thrpt   10   6735285,753 ±  281407,613  ops/s
[info] Main.testMethodHandleUnreflect                 thrpt   10  28706699,796 ±  755897,511  ops/s
[info] Main.testMethodHandleUnreflectListSize         thrpt   10  20084867,818 ±  449023,818  ops/s
[info] Main.testMethodHandleUnreflectSimple           thrpt   10  28637750,180 ±  685004,308  ops/s
[info] Main.testMethodHandleUnreflectSimpleArguments  thrpt   10   5267296,404 ±   71604,568  ops/s