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COOKBOOK

Various information and commands and techniques to get things done.

Kernel versioning

  • Unstable always takes the latest LTS release
  • Stable sticks with the LTS at the time of the first release
  • Stable also provides a backport of the latest from unstable (linuxPackages_latest)

Running a package flake from a github repo

nix run github:bluskript/nix-inpsect

Read-Eval-Print Loop (REPL)

nix repl nix repl --expr 'import <nixpkgs>{}

nix eval

Get derivation params

nix eval -f '<nixpkgs>' 'vscode.version'

Get list of all packages

nix eval nixpkgs#legacyPackages.x86_64-linux --apply builtins.attrNames

Get list of linux packages

nix eval nixpkgs#legacyPackages.x86_64-linux.linuxPackages --apply builtins.attrNames

Get linux kernel version (not necessarily the installed one)

nix eval nixpkgs#legacyPackages.x86_64-linux.linuxPackages.kernel.baseVersion --apply builtins.attrNames

Get list of builtins

nix eval nixpkgs#lib --apply builtins.attrNames

Determining where config is defined, which can be used to debug issues such as conflicts

In an attempt to find out why conflicting Nvidia drivers were being built, I was told by ElvishJerricco on Element to try the following:

nix eval .#nixosConfigurations.upaya.options.boot.extraModulePackages.definitionsWithLocations --apply 'map (x: x.file)'

nix eval .#nixosConfigurations.upaya.options.boot.extraModulePackages.definitionsWithLocations --apply 'xs: builtins.listToAttrs (map (x: { name = toString x.file; value = toString x.value; }) xs)'

In the process, it turns out that using

inputs.nixpkgs.lib.nixosSystem {
  modules = [
    (import ./hosts/upaya/configuration.nix)`
  ];
};

kills debug information, and is better done as:

inputs.nixpkgs.lib.nixosSystem {
  modules = [
    ./hosts/upaya/configuration.nix
  ];
};

nix-inspect

nix-inspect .

Removing a file from /nix/store, e.g. a lock file that has somehow been left behind

sudo mkdir /mnt/store_rw
sudo mount -o rw --bind /nix/store /mnt/store_rw/
sudo rm /mnt/store_rw/<path>/file
sudo umount /mnt/store_rw