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docs/hacking.md
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       # hacking on tangled

     

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       We highly recommend [installing

     

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       nix](https://nixos.org/download/) (the package manager)

     

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       before working on the codebase. The nix flake provides a lot

     

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       of helpers to get started and most importantly, builds and

     

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       dev shells are entirely deterministic.

     

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       To set up your dev environment:

     

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       ```bash

     

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       nix develop

     

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       ```

     

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       Non-nix users can look at the `devShell` attribute in the

     

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       `flake.nix` file to determine necessary dependencies.

     

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       ## running the appview

     

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       The nix flake also exposes a few `app` attributes (run `nix

     

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       flake show` to see a full list of what the flake provides),

     

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       one of the apps runs the appview with the `air`

     

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       live-reloader:

     

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       ```bash

     

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       TANGLED_DEV=true nix run .#watch-appview

     

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       # TANGLED_DB_PATH might be of interest to point to

     

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       # different sqlite DBs

     

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       # in a separate shell, you can live-reload tailwind

     

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       nix run .#watch-tailwind

     

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       ```

     

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       ## running a knotserver

     

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       An end-to-end knotserver setup requires setting up a machine

     

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       with `sshd`, `repoguard`, `keyfetch`, a git user, which is

     

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       quite cumbersome and so the nix flake provides a

     

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       `nixosConfiguration` to do so.

     

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       To begin, head to `http://localhost:3000` in the browser and

     

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       generate a knotserver secret. Replace the existing secret in

     

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       `flake.nix` with the newly generated secret.

     

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       You can now start a lightweight NixOS VM using

     

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       `nixos-shell` like so:

     

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       ```bash

     

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       QEMU_NET_OPTS="hostfwd=tcp::6000-:6000,hostfwd=tcp::2222-:22" nixos-shell --flake .#knotVM

     

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       # hit Ctrl-a + c + q to exit the VM

     

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       ```

     

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       This starts a knotserver on port 6000 with `ssh` exposed on

     

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       port 2222. You can push repositories to this VM with this

     

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       ssh config block on your main machine:

     

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       ```bash

     

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       Host nixos-shell

     

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           Hostname localhost

     

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           Port 2222

     

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           User git

     

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           IdentityFile ~/.ssh/my_tangled_key

     

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       ```

     

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       Set up a remote called `local-dev` on a git repo:

     

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       ```bash

     

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       git remote add local-dev git@nixos-shell:user/repo

     

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       git push local-dev main

     

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       ```