ibizaman 2c23d8a258 tests: keep trace even on failure

2026-06-04 00:47:53 +02:00

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Contributing

All issues and Pull Requests are welcome!

Use this project. Something does not make sense? Something's not working?
Documentation. Something is not clear?
New services. Have one of your preferred service not integrated yet?
Better patterns. See something weird in the code?

For PRs, if they are substantial changes, please open an issue to discuss the details first. More details in the contributing section of the manual.

Issues that are being worked on are labeled with the in progress label. Before starting work on those, you might want to talk about it in the issue tracker or in the matrix channel.

The prioritized issues are those belonging to the next milestone. Those issues are not set in stone and I'd be very happy to solve an issue an user has before scratching my own itch.

first.

Chat Support

Come hang out in the Matrix channel. :)

Upstream Changes

One important goal of SHB is to be the smallest amount of code above what is available in nixpkgs. It should be the minimum necessary to make packages available there conform with the contracts. This way, there are less chance of breakage when nixpkgs gets updated. I intend to upstream to nixpkgs as much of those as makes sense.

Run tests

Run all tests:

$ nix flake check
# or
$ nix run github:Mic92/nix-fast-build -- --skip-cached --flake ".#checks.$(nix eval --raw --impure --expr builtins.currentSystem)"

Run one group of tests:

$ nix build .#checks.${system}.modules
$ nix build .#checks.${system}.vm_postgresql_peerAuth

Playwright Tests

If the test includes playwright tests, you can see the playwright trace with:

$ nix run .#playwright -- show-trace $(nix eval .#checks.x86_64-linux.vm_grocy_basic --raw)/trace/0.zip

If the test fails, you won't have the output directory available. Instead, run the test with --keep-failed and at the end you will see a line saying

Keeping build directory '/nix/var/nix/builds/nix-31776-4270051001/build'

Copy the path and run:

sudo cp -r /nix/var/nix/builds/nix-31776-4270051001/build/shared-xchg/trace trace && sudo chown -R $USER: trace

Now, open that file with playwright:

nix run .#playwright -- show-trace trace/0.zip

Debug Tests

Run the test in driver interactive mode:

$ nix run .#checks.${system}.vm_postgresql_peerAuth.driverInteractive

When you get to the shell, start the server and/or client with one of the following commands:

server.start()
client.start()
start_all()

To run the test from the shell, use test_script(). Note that if the test script ends in error, the shell will exit and you will need to restart the VMs.

After the shell started, you will see lines like so:

SSH backdoor enabled, the machines can be accessed like this:
Note: this requires systemd-ssh-proxy(1) to be enabled (default on NixOS 25.05 and newer).
    client:  ssh -o User=root vsock/3
    server:  ssh -o User=root vsock/4

With the following command, you can directly access the server's nginx instance with your browser at http://localhost:8000:

ssh-keygen -R vsock/4; ssh -o User=root -L 8000:localhost:80 vsock/4

Upload test results to CI

Github actions do now have hardware acceleration, so running them there is not slow anymore. If needed, the tests results can still be pushed to cachix so they can be reused in CI.

After running the nix-fast-build command from the previous section, run:

$ find . -type l -name "result-vm_*" | xargs readlink | nix run nixpkgs#cachix -- push selfhostblocks

Upload package to CI

In the rare case where a package must be built but cannot in CI, for example because of not enough memory, you can push the package directly to the cache with:

nix build .#checks.x86_64-linux.vm_karakeep_backup.nodes.server.services.karakeep.package
readlink result | nix run nixpkgs#cachix -- push selfhostblocks

Deploy using colmena

$ nix run nixpkgs#colmena -- apply

Use a local version of selfhostblocks

This works with any flake input you have. Either, change the .url field directly in you flake.nix:

selfhostblocks.url = "/home/me/projects/selfhostblocks";

Or override on the command line:

$ nix flake lock --override-input selfhostblocks ../selfhostblocks

I usually combine the override snippet above with deploying:

$ nix flake lock --override-input selfhostblocks ../selfhostblocks && nix run nixpkgs#colmena -- apply

Diff changes

First, you must know what to compare. You need to know the path to the nix store of what is already deployed and to what you will deploy.

What is deployed

To know what is deployed, either just stash the changes you made and run build:

$ nix run nixpkgs#colmena -- build
...
Built "/nix/store/yyw9rgn8v5jrn4657vwpg01ydq0hazgx-nixos-system-baryum-23.11pre-git"

Or ask the target machine:

$ nix run nixpkgs#colmena -- exec -v readlink -f /run/current-system
baryum | /nix/store/77n1hwhgmr9z0x3gs8z2g6cfx8gkr4nm-nixos-system-baryum-23.11pre-git

What will get deployed

Assuming you made some changes, then instead of deploying with apply, just build:

$ nix run nixpkgs#colmena -- build
...
Built "/nix/store/16n1klx5cxkjpqhrdf0k12npx3vn5042-nixos-system-baryum-23.11pre-git"

Get the full diff

With nix-diff:

$ nix run nixpkgs#nix-diff -- \
  /nix/store/yyw9rgn8v5jrn4657vwpg01ydq0hazgx-nixos-system-baryum-23.11pre-git \
  /nix/store/16n1klx5cxkjpqhrdf0k12npx3vn5042-nixos-system-baryum-23.11pre-git \
  --color always | less

Get version bumps

A nice summary of version changes can be produced with:

$ nix run nixpkgs#nvd -- diff \
  /nix/store/yyw9rgn8v5jrn4657vwpg01ydq0hazgx-nixos-system-baryum-23.11pre-git \
  /nix/store/16n1klx5cxkjpqhrdf0k12npx3vn5042-nixos-system-baryum-23.11pre-git \

Generate random secret

$ nix run nixpkgs#openssl -- rand -hex 64

Write code

service-implementation-guide.md

Links that helped

While creating NixOS tests:

While creating an XML config generator for Radarr:

8.1 KiB Raw Blame History