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How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

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#include <iostream>
#include <cassert>

using RequestHandler = void (*)(void);
struct RequestHandlers {
    static constexpr size_t MAX_REQ_TYPE_CNT = 255;

    enum EFlags {
        IsExisting = 0x01,
    };

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from PySide2.QtCore import QTimer, QObject, SIGNAL
from PySide2.QtGui import QResizeEvent
from PySide2.QtWidgets import QApplication, QWidget, QLabel, QMainWindow
from PySide2.QtSvg import QSvgWidget

import sys

class AppWindow(QMainWindow):
    def __init__(self, parent=None):
        super(AppWindow, self).__init__(parent)

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sudo apt install autoconf build-essential bison flex git texinfo help2man gawk libtool libncurses5-dev python3-dev python3-distutils
git clone http://github.com/crosstool-ng/crosstool-ng

cd crosstool-ng
./bootstrap
./configure --enable-local
DEFCONFIG=samples/.../crosstool.config ./ct-ng defconfig
./ct-ng build

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import os.path

from PyPDF2 import PdfFileReader, PdfFileWriter

# chunk_size, path = sys.argv[1], sys.argv[2]
chunk_size, path = 50, '/home/serg/print/auto/fluent.pdf'  # '/home/serg/Documents/sicp.pdf'
pdf = PdfFileReader(str(path))
cnt = pdf.getNumPages()

ranges = [range(i, i+chunk_size) for i in range(0, cnt, chunk_size)]

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import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';

void main() {
  runApp(StartupApplication());
}

enum Page { screenDashboard, screenProfile, screenSearch }

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#include <iostream>
#include <memory>

#include <cxxabi.h> // <-- gcc header

template <typename type> std::unique_ptr<const char*> type_name(const type *addr)
{ return std::make_unique<const char *>(abi::__cxa_demangle(typeid(*addr).name(), 0, 0, NULL)); }

template<typename T> struct MyTest {
    MyTest(T _data) : data(_data) { }

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#include <iostream>

template <typename T> constexpr
void print_type() {
    std::cerr << __PRETTY_FUNCTION__ << std::endl;
}

enum ETypes {
    type1,
    type2

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#include <stdio.h>

#include <assert.h>

#include <string.h>

#include <fcntl.h>

#include <malloc.h>