Posts on blog.szypowi.cz

Terraform under AzureCLI@2 never sees your cancel

Mon, 20 Apr 2026 12:00:00 +0200

If you cancel an Azure DevOps pipeline mid-terraform apply, or let it hit its timeoutInMinutes, you probably expect terraform to catch SIGINT, release its state lock, and exit cleanly. Under AzureCLI@2 that does not happen. Terraform is SIGKILLed without ever seeing a signal, and the state lock stays behind.

What I measured

The Azure Pipelines agent applies a signal ladder on cancel: SIGINT, wait PROCESS_SIGINT_TIMEOUT ms (default 7500), SIGTERM, wait PROCESS_SIGTERM_TIMEOUT ms (default 2500), SIGKILL. Straightforward on paper.

Testing podman < 2.1.x rootless networking

Thu, 22 Oct 2020 15:09:54 +0100

A quick note on podman 2.1.x rootless networking.

What changed

Until 2.1.0, to let two containers talk to each other directly, you had to put them in the same pod. From 2.1.0 onward you can create a network and attach containers to it, and each gets its own IP address on that network.

The test

Run an httpd container, then curl it from another container on the same network.

$ podman network create cni-podman0
$ podman run --name httpd --network cni-podman0 -dt httpd
$ podman inspect httpd | grep IPAddress
 "IPAddress": "",
 "IPAddress": "10.88.2.12",

Note the IP, then curl it from a second container on the same network:

Testing and signing kernel for Ubuntu 20.04

Fri, 15 May 2020 10:04:54 +0100

Disclaimer. This is about mainline kernel builds, summarized from the Ubuntu wiki:

By default, Ubuntu systems run with the Ubuntu kernels provided by the Ubuntu repositories. However it is handy to test unmodified upstream kernels to help locate problems in Ubuntu kernel patches, or to confirm that upstream has fixed a specific issue. These kernels are not supported and are not appropriate for production use.

Install a mainline kernel via PPA

Detailed official instructions: https://wiki.ubuntu.com/Kernel/MainlineBuilds.

Enable Mozilla Firefox and Thunderbird on Wayland in Ubuntu 20.04

Fri, 01 May 2020 10:04:54 +0100

This guide walks through turning on Wayland fractional scaling (FS) on Ubuntu 20.04 and then pointing Firefox and Thunderbird at it natively.

Wayland

At the time of writing Ubuntu counted Wayland users as “less than 1%”¹. Feel special.

Enable

Follow https://linuxconfig.org/how-to-enable-disable-wayland-on-ubuntu-20-04-desktop.

Test

GUI. Settings -> About -> Windowing system.

CLI. Check whether your current session is a Wayland one²:

# Check your session ID
$ loginctl
$ loginctl show-session <SESSION_ID> -p Type

# or as a one-liner
$ loginctl show-session $(awk '/tty/ {print $1}' <(loginctl)) -p Type | awk -F= '{print $2}'

For example: