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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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```