Pi-Hole and IPV6 – How to make it work?

Im using Pi-Hole with IPV4, recently I discovered my router Xiaomi AX1800 (OpenWRT) supports IPv6, as well as my ISP (A1).

I noticed that I can assign DHCP static IPv4 assignment from the router’s interface, but I can’t do the same for IPv6. That’s why I decided to set a static IPv6 address for the machine running Pi-Hole (Raspberry Pi 2).

There is a short guide on how to do that:

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Can I disable the default browser response for Shift-click event?

In the newer browsers, you can distinguish the Shift-click event from a simple click, and disable the default response for Shift-click.

To disable Shift-click, insert the following code in your page’s <HEAD> section:


<script language="JavaScript">
  function mouseDown(e) {
    let shiftPressed=0;
  
    if (document.layers) {
        shiftPressed=(e.modifiers-0>3);
    } else {
      shiftPressed=e.shiftKey;
    }
  
    if (shiftPressed) {
      return false;
    }
  
    return true;
  }
  document.onmousedown = mouseDown;
<script>

Organize pictures by the data taken


#!/usr/bin/env bash
BASE_DIR=$1

if [ ! -d "${BASE_DIR}" ] ; then
echo "$BASE_DIR is not a directory";
fi

## Find those files that are older than a month
find "$BASE_DIR" -maxdepth 1 -mtime +30 -type f -name '*.jpg' |
while IFS= read -r file; do
## Get the file's modification year
year="$(date -d "$(stat -c %y "$file")" +%Y)"
## Get the file's modification month
month="$(date -d "$(stat -c %y "$file")" +%b)"

## Create the directories if they don't exist. The -p flag
## makes 'mkdir' create the parent directories as needed so
## you don't need to create $year explicitly.
[[ ! -d "$BASE_DIR/$year/$month" ]] && mkdir -p "$BASE_DIR/$year/$month";

## Move the file
mv "$file" "$BASE_DIR/$year/$month"
done

Hot to install GPaste on Ubuntu 23.10

GPaste is an open-source clipboard management tool for Linux-based operating systems. Clipboard managers like GPaste allow users to manage and access a history of items they have copied to the clipboard, enabling them to easily paste previously copied content.

Sadly, there are binary packages available but you can compile it and install it manually.

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Docker fails to fetch http://deb.debian.org/debian/dists/buster/InRelease

I found a network issue when trying to build my docker image: the command `apt update` fails with the following error:

W: Failed to fetch http://deb.debian.org/debian/dists/buster/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/buster-updates/InRelease
W: Failed to fetch http://security.debian.org/dists/buster/updates/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/buster/Release.gpg Temporary failure resolving ‘deb.debian.org’
W: Failed to fetch http://security.debian.org/dists/buster/updates/Release.gpg Temporary failure resolving ‘security.debian.org’
W: Failed to fetch http://deb.debian.org/debian/dists/buster-updates/Release.gpg Temporary failure resolving ‘deb.debian.org’
W: Some index files failed to download. They have been ignored, or old ones used instead.

This happens because your ISP DNS servers are not reachable from this network. The easiest workaround is to directly instruct Docker to rely on some public DNS servers proven to be stable and reliable (Google, Cloudflare).

Add them to a new configuration file called daemon.json:

$ sudo pico /etc/docker/daemon.json

Insert the following:

{
    "dns": ["1.1.1.1", "8.8.8.8", "8.8.4.4"]
}

Then restart the service:

$ sudo service docker restart

Composer 2.3.0 breaks Symfony 3.4 app

If you experience the following error while installing the required packages for Symfony 3.4 packages, it is highly possible to have Composer 2.3.0 or newer installed:

symfony-scripts: Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap

In Process.php line 143:

[TypeError]
Argument 1 passed to Symfony\Component\Process\Process::__construct() must
be of the type array, string given, called in /var/www/example.com/releases/20220330124916/vendor/sensio/distribution-bundle/Composer/Scrip
tHandler.php on line 310

The root cause of the issue is that Composer 2.3.x requires symfony/process^5 itself, but your project also has a dependency on symfony/process^4 somewhere, composer loads it first and when your project tries to use it, expecting v4 but using v5 instead it triggers the error

The quick and dirty solution is to downgrade Composer to 2.2.x so you are able to update your dependencies normally. To do that just run the following command

sudo composer self-update 2.2.9

Enjoy!

 

How to install autojump for Fish on Ubuntu

Autojump is a tool that can be used to jump around in the shell to frequently used directories by typing just a part of their name. It is typically aliased to j. Autojump is available as a package in the Ubuntu repositories, but it needs manual intervention to be available in the fish shell.

1. Install autojump

sudo apt install autojump

2. Source the autojump.fish file in your fish configuration, by opening the file ~/.config/fish/config.fish in an editor and adding these lines:

begin
    set --local AUTOJUMP_PATH /usr/share/autojump/autojump.fish
    if test -e $AUTOJUMP_PATH
        source $AUTOJUMP_PATH
    end
end

3. Add j shortcut command to fish creating a new file ~/.config/fish/functions/j.fishwith the following content:

function j
    set new_path (autojump $argv)

    if test -d "$new_path"
        echo $new_path
        cd "$new_path"
    else
        echo "autojump: directory '$argv' not found"
        echo "Try \`autojump --help\` for more information."
        false
    end
end

Usage examples:

j Down – changes to my Downloads folder
j work – changes to my workspace folder

Enjoy!

Test Assignments

In recent years I have applied to numerous development jobs driven by my will to develop my career and find better pay. It’s common nowadays for companies to give test assignments supposed to verify the candidate’s coding skills, as well as his/her ability to organize work. There is no test assignment I have failed to fulfil, but there are many times when I failed to explain it properly in a technical interview discussing my solution. I am a self-taught developer and have no formal technical education (excluding the high school where I specialized in microprocessors – a more hardware-oriented field of study). So, when the technical interviewer says “Nice solution, but can you describe the cyclomatic complexity of it?” I am done.

Honestly, I am aware of my skills, strengths and weaknesses. I haven’t gained experience with a lot of modern and trendy technologies that well-paying companies require. What kept me in the game for 15 years is mostly my ability to troubleshoot complex problems and provide simple solutions to them. Additionally, I have excellent communication skills, and I can explain complex technical issues to non-technical stakeholders in a way that is easy to understand. This has proven valuable in many situations, where I have been able to build strong relationships with clients and stakeholders and ensure that everyone is on the same page. That’s why my recent employers trust me to mentor and onboard others, not because of my top-notch up-to-date experience with all the fancy new technologies that popped up recently.

Anyway. This post is a short review of what I’ve done as coding challenges in recent years. I hope it’s a pretty comprehensive code base proving my ability to solve problems with code. Honestly, if I have to write yet another code assignment, I feel better working on something else and fuck development.

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How to test for uniqueness of value in Yup.array?

Imagine you have a form with a dynamic amount of inputs – in my case, it is an array of objects holding “name” and “surname” properties and you need to validate that all objects in this array have unique name property.

Example schema:

const users = yup.array().of(yup.object().shape({
    name:  yup.string(),
    surname: yup.string(),
}))

How can you test for uniqueness? There is no built-in validator, but you can create a custom one easily extending Yup.test.  This validator allows you to add a test function to the validation chain. Tests are run after any object is cast. In order to allow asynchronous custom validations all (or no) tests are run asynchronously. A consequence of this is that test execution order cannot be guaranteed.

All tests must provide a name, an error message and a validation function that must return true when the current value is valid and false or a ValidationError otherwise. To make a test async return a promise that resolves true or false or a ValidationError.

For the message argument you can provide a string which will interpolate certain values if specified using the ${param} syntax. By default, all test messages are passed a path value which is valuable in nested schemas.

The test function is called with the current value.

const users = yup.array().of(yup.object().shape({
    name:  yup.string(),
    surname: yup.string(),
})).test(
    'unique',
        t('step2.validation_errors.duplicate').toString(),
        (value) => {
          if (!value) return true;

          const unique = value.filter((v: any, i: number, a: any) => a.findIndex((t: any) => (t.name === v.name && t.surname === v.surname)) === i);
          return unique.length === value.length;
    }
)

Because the uniqueness check is not related to a particular element of the users object but is a general validation constraint for the whole object, the error message will be populated as “errors.people” property of Formik. That’s why I am checking if the erros.users is a string – if it is a string, I should display a general error above all the user’s fields, but if it is an array of errors – it contains errors for a particular index of the users array.

{typeof errors.users === 'string' && <ErrorMessage
name="users"
component="div"
className="elementor-field-group mt-2 text-sm text-red-600 dark:text-red-500"
/>}