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readme: better repl commands

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Casper V. Kristensen 2024-02-18 20:55:45 +01:00
parent b5e0ecffe9
commit 91597180b1
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@ -104,25 +104,24 @@ nix develop --command $SHELL
# nix shell with python packages
# https://discourse.nixos.org/t/nix-shell-for-python-packages/16575
# https://github.com/NixOS/nix/issues/5567
nix shell --impure --expr 'with builtins.getFlake "nixpkgs"; with legacyPackages.x86_64-linux; python3.withPackages (ps: with ps; [ numpy ])'
nix shell --impure --expr 'with builtins.getFlake "nixpkgs"; with legacyPackages.${builtins.currentSystem}; python3.withPackages (ps: with ps; [ numpy ])'
```
### Debugging
```bash
```nix
# load flake into repl
nix repl
:lf .
# print the value of a configuration settings
:p nixosConfigurations.omega.config.services.openssh.ports
# print _why_ the value is as it is (source of defaults, overwrites)
:p nixosConfigurations.omega.options.services.openssh.ports
# print value of home-manager setting
:p nixosConfigurations.omega.config.home-manager.users.caspervk.programs.ssh.matchBlocks
# print a configuration option
:p nixosConfigurations.omega.options.services.openssh.ports.declarationPositions # declaration
:p nixosConfigurations.omega.options.services.openssh.ports.default # declaration default
:p nixosConfigurations.omega.options.services.openssh.ports.definitionsWithLocations # overwrites
:p nixosConfigurations.omega.options.services.openssh.ports.value # current value
# print derivation package names
:p builtins.map (d: d.name) outputs.nixosConfigurations.omega.options.environment.systemPackages.value
# print version of package in nixpkgs
:p inputs.nixpkgs.outputs.legacyPackages.x86_64-linux.openssh.version
:p inputs.nixpkgs.outputs.legacyPackages.${builtins.currentSystem}.openssh.version
```