All posts by Roman

Migrate subfolder to separate git repository

Let’s say you have a repository structure like below (eg. because previously it was SVN repository where everything was on one place).

  • .\Web
    • .\
    • .\

Now you would like to move to separate git repository.

First of all, you need to install git-filter-repo.

# Clone old repository to new directory

# Remove everything else except directory
git filter-repo --path

# Make new root directory
git filter-repo --subdirectory-filter

# Push to a new repository
git remote add origin NEW_REPOSITORY
git push -u origin master

Connect to Mac using VNC from Windows using encrypted connection

On Mac you need to enable Remote Login and Screen Sharing.

Note: If Remote Login is not starting with message “Remote Login starting…” you might need to manually add a launch daemon:
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist

On Windows run Powershell and create encrypted SSH tunnel. Replace USERNAME with your user name and MAC_IP_ADDRESS with IP address of your Mac.


Now use a VNC client (eg. RealVNC Viewer) and connect to RealVNC will still complain about unsecure connection but the connection will be local only (

UniFi Protect behind nginx proxy

Below is a snippet of nginx configuration that will enable access to your UniFi Controller (eg. Unifi Cloud Key Gen2) using nginx reverse proxy.

server {
        listen 443 ssl;

        location / {
                include /etc/nginx/proxy_params;
                proxy_pass https://IP_ADDRESS_OF_THE_CONTROLLER/;

                # WebSocket support
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";

Installing Arch Linux ARM on Raspberry PI 3

Insert SD card to your system.

sudo fdisk -l
sudo fdisk /dev/sdX

Create partitions.

  • Clear partitions (o)
  • Create boot partition (n, p, 1, enter, +500M, t, c)
  • Create system partition (n, p, 2, enter, enter)
  • Write partitions (w)
sudo mkfs.vfat /dev/sdX1
sudo mkfs.ext4 /dev/sdX2

Mount new partitions.

sudo mkdir /mnt/boot/
sudo mkdir /mnt/root/

sudo mount /dev/sdx1 /mnt/boot/
sudo mount /dev/sdx2 /mnt/root/

Download and install Arch Linux ARM.

sudo su
tar zxvf ArchLinuxARM-rpi-aarch64-latest.tar.gz -C /mnt/root
mv /mnt/root/boot/* /mnt/boot
umount /mnt/boot/
umount /mnt/root/

Remove SD card, insert it into Raspberry PI and boot it to complete the installation.

pacman-key --init
pacman-key --populate archlinuxarm
pacman -Syu

Append value to Multi SZ Registry value using PowerShell

In the sample bellow the PowerShell script will append a service into RemoteAccessCheckExemptionList in registry. It also checks whether the value already exists there or not.

$subkey = 'SYSTEM\CurrentControlSet\Control\SecurePipeServers\SCM'
$value  = 'RemoteAccessCheckExemptionList'

$reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $server)
$key = $reg.OpenSubKey($subkey, $true)
$list = $key.GetValue($value)

if ($list -notcontains 'MyServiceName') {
  $list += 'MyServiceName'

$key.SetValue($value, [string[]]$list, 'MultiString')

Wondering why messages are deleted from your trash after a week?

I had a special script that removes e-mail from Trash after 90 days. But one day I was looking for a message older than 7 days and realized that older messages are no longer in trash!

I checked Roundcube settings, but it does not have such option. There is only an option to delete all messages from after logout.

Auto expunge can be configured in dovecot, but there was not such configuration:

doveconf | grep expunge

People on the internet were pointing to mail clients like Thunderbird. After some more digging I found out the iPhone by default has such setting! OMG!!!

You need to go to your mail account advanced settings on your iPhone.