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https://github.com/fort-nix/nix-bitcoin.git
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106 lines
3.5 KiB
Markdown
106 lines
3.5 KiB
Markdown
This directory contains docs and helper scripts for developing and debugging:
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- [`dev.sh`](./dev.sh): misc dev helpers
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- [`dev-features.sh`](./dev-features.sh): helpers for developing specific
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nix-bitcoin features, like services
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- [`topics`](./topics) features specific topics
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- [`dev-scenarios.nix`](./dev-scenarios.nix): extra test scenarios used in the above scripts
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See also: [test/README.md](../test/README.md)
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## Run a dev shell
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There are two ways to run a dev shell:
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### 1. Run command `nix develop`
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This starts a shell with [`test/run-tests.sh`](../test/run-tests.sh) and
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the scripts in dir [`helper`](../helper) added to `PATH`.
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### 2. Setup and start the `direnv` dev env
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This is an opinionated, [direnv](https://direnv.net/)-based dev env, optimized for developer experience.
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[`dev-env/create.sh`](./dev-env/create.sh) creates a git repo with the following contents:
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- Dir `src` which contains the nix-bitcoin repo
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- Dir `bin` for helper scripts
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- File `scenarios.nix` for custom test scenarios
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- File `.envrc` that defines a [direnv](https://direnv.net/) environment,
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mainly for adding nix-bitcoin and helper scripts to `PATH`
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#### Installation
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1. [Install direnv](https://direnv.net/docs/installation.html).\
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If you use NixOS (and Bash as the default shell), just add the following to your system config:
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```nix
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environment.systemPackages = [ pkgs.direnv ];
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programs.bash.interactiveShellInit = ''
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eval "$(direnv hook bash)"
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'';
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```
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2. Create the dev env:
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```bash
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# Set up a dev environment in dir ~/dev/nix-bitcoin.
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# The dir is created automatically.
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./dev-env/create.sh ~/dev/nix-bitcoin
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cd ~/dev/nix-bitcoin
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# Enable direnv
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direnv allow
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```
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3. Optional: Editor integration
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- Add envrc support to your editor
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- Setup your editor so you can easily execute lines or paragraphs from a shell script
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file in a shell.\
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This simplifies using dev helper scripts like [`./dev.sh`](./dev.sh).
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#### Explore the dev env
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```bash
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# The direnv is automatically activated when visiting any subdir of ~/dev/nix-bitcoin
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cd ~/dev/nix-bitcoin
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ls -al . bin lib
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# The direnv config file
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cat .envrc
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# You can use this file to define extra scenarios
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cat scenarios.nix
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# Binary `dev-run-tests` runs nix-bitcoin's `run-tests.sh` with extra scenarios from ./scenarios.nix
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# Example:
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# Run command `nodeinfo` in `myscenario` (defined in ./scenarios.nix) via a container
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dev-run-tests -s myscenario container --run c nodeinfo
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# Equivalent (shorthand)
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te -s myscenario container --run c nodeinfo
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# Run the tests for `myscenario` in a VM
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te -s myscenario
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# Start an interactive shell inside a VM
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te -s myscenario vm
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```
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See also: [test/README.md](../test/README.md)
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## Adding a new service
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It's easiest to use an existing service as a template:
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- [electrs.nix](../modules/electrs.nix): a basic service
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- [clightning.nix](../modules/clightning.nix): simple, but covers a few more features.\
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(A `cli` binary and a runtime-composed config to include secrets.)
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- [rtl.nix](../modules/rtl.nix): includes a custom package, defined in [pkgs/rtl](../pkgs/rtl).\
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Most other services use packages that are already included in nixpkgs.
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## Switching to a new NixOS release
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- [flake.nix](../flake.nix): update `nixpkgs.url`
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- [cirrus.yml](../.cirrus.yml): update toplevel container -> image attribute
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- [examples/configuration.nix](../examples/configuration.nix): update `system.stateVersion`
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- [examples/flakes/flake.nix](../examples/flakes/flake.nix): update `inputs.nix-bitcoin.url`
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- Treewide: check if any `TODO-EXTERNAL` comments can be resolved
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