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171: Add more docs r=roberth a=woile

This PR adds the following:

- an examples folder
- an example for devShell
- templates are no longer marked as examples, now there are templates and examples avoiding confusion

#170 

Co-authored-by: Santiago Fraire <santiwilly@gmail.com>
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
This commit is contained in:
bors[bot] 2023-07-04 10:20:19 +00:00 committed by GitHub
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9 changed files with 349 additions and 7 deletions

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@ -10,6 +10,12 @@ Opinionated features are provided by an ecosystem of modules that you can import
`flake-parts` _itself_ has the goal to be a minimal mirror of the Nix flake schema.
Used by itself, it is very lightweight.
---
**Documentation**: [flake.parts](https://flake.parts)
---
# Why Modules?
Flakes are configuration. The module system lets you refactor configuration
@ -71,14 +77,22 @@ then slide `mkFlake` between your outputs function head and body,
Now you can add the remaining module attributes like in the [the template](./template/default/flake.nix).
# Example
# Templates
See [the template](./template/default/flake.nix).
# Examples
See the [examples/](./examples) directory.
# Projects using flake-parts
- [nixd](https://github.com/nix-community/nixd/blob/main/flake.nix) (c++)
- [hyperswitch](https://github.com/juspay/hyperswitch/blob/main/flake.nix) (rust)
- [argo-workflows](https://github.com/argoproj/argo-workflows/blob/master/dev/nix/flake.nix) (go)
- [nlp-service](https://github.com/recap-utr/nlp-service/blob/main/flake.nix) (python)
- [emanote](https://github.com/srid/emanote/blob/master/flake.nix) (haskell)
# Options Reference
See [flake.parts options](https://flake.parts/options/flake-parts.html)
# Documentation
See [flake.parts](https://flake.parts)

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@ -0,0 +1,6 @@
protocol Hello {
record Hello {
string message;
int timestamp;
}
}

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@ -0,0 +1,42 @@
# project-commands
> **Warning**
> If you copy the flake.nix remember to `git add [-N|--intent-to-add] flake.nix`, otherwise it won't work
This example shows how to create scripts for your project, by leveraging [mission-control](https://github.com/Platonic-Systems/mission-control)
This is a **potential** alternative to:
- Using a `Makefile` to manage your project's scripts
- Using the popular [Scripts To Rule Them All](https://github.com/github/scripts-to-rule-them-all); a naming convention for a `scripts/` directory
- Using a `bin/` directory
## Explanation
In this example we use the [avro-tools](https://avro.apache.org/) to convert our scripts from `.avdl` to `.avsc`.
You don't need to know anything about avro to understand mission-control and use this example (that's Nix baby 🚀).
When setting up [mission-control](https://github.com/Platonic-Systems/mission-control), we add
one script called `build`. Because of `wrapperName = "run";`, once we open the shell created by nix,
the commands will be listed as `run build`.
mission-control depends on flake-root, which also exposes the helpful `$FLAKE_ROOT` variable.
After creating the scripts, we need to pass the newly created scripts to the desired shell, in this example we use the default shell.
## Usage
Run:
```sh
nix develop
```
And mission-control will print in the new shell the available commands (you should see only one).
Try running
```sh
run build
```

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@ -0,0 +1,95 @@
{
"nodes": {
"flake-parts": {
"inputs": {
"nixpkgs-lib": "nixpkgs-lib"
},
"locked": {
"lastModified": 1685662779,
"narHash": "sha256-cKDDciXGpMEjP1n6HlzKinN0H+oLmNpgeCTzYnsA2po=",
"owner": "hercules-ci",
"repo": "flake-parts",
"rev": "71fb97f0d875fd4de4994dfb849f2c75e17eb6c3",
"type": "github"
},
"original": {
"id": "flake-parts",
"type": "indirect"
}
},
"flake-root": {
"locked": {
"lastModified": 1680964220,
"narHash": "sha256-dIdTYcf+KW9a4pKHsEbddvLVSfR1yiAJynzg2x0nfWg=",
"owner": "srid",
"repo": "flake-root",
"rev": "f1c0b93d05bdbea6c011136ba1a135c80c5b326c",
"type": "github"
},
"original": {
"owner": "srid",
"repo": "flake-root",
"type": "github"
}
},
"mission-control": {
"locked": {
"lastModified": 1683658484,
"narHash": "sha256-JkGnWyYZxOnyOhztrxLSqaod6+O/3rRypq0dAqA/zn0=",
"owner": "Platonic-Systems",
"repo": "mission-control",
"rev": "a0c93bd764a3c25e6999397e9f5f119c1b124e38",
"type": "github"
},
"original": {
"owner": "Platonic-Systems",
"repo": "mission-control",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1687502512,
"narHash": "sha256-dBL/01TayOSZYxtY4cMXuNCBk8UMLoqRZA+94xiFpJA=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "3ae20aa58a6c0d1ca95c9b11f59a2d12eebc511f",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs-lib": {
"locked": {
"dir": "lib",
"lastModified": 1685564631,
"narHash": "sha256-8ywr3AkblY4++3lIVxmrWZFzac7+f32ZEhH/A8pNscI=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "4f53efe34b3a8877ac923b9350c874e3dcd5dc0a",
"type": "github"
},
"original": {
"dir": "lib",
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-parts": "flake-parts",
"flake-root": "flake-root",
"mission-control": "mission-control",
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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@ -0,0 +1,37 @@
{
description = "Description for the project";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
mission-control.url = "github:Platonic-Systems/mission-control";
flake-root.url = "github:srid/flake-root";
};
outputs = inputs@{ flake-parts, ... }:
flake-parts.lib.mkFlake { inherit inputs; } {
imports = [
inputs.mission-control.flakeModule
inputs.flake-root.flakeModule
];
systems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" ];
perSystem = { config, self', inputs', pkgs, system, ... }: {
devShells.default = pkgs.mkShell {
nativeBuildInputs = with pkgs; [ avro-tools ];
inputsFrom = [ config.mission-control.devShell config.flake-root.devShell ];
};
mission-control = {
wrapperName = "run";
scripts = {
build = {
description = "convert files from .avdl to .avsc";
exec = ''
avro-tools idl2schemata "$FLAKE_ROOT/Hello.avdl" .
'';
category = "Development";
};
};
};
};
};
}

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@ -0,0 +1,55 @@
# shell-environment
> **Warning**
> If you copy the flake.nix remember to `git add [-N|--intent-to-add] flake.nix`, otherwise it won't work
This example shows how to create a shell environment which
includes a diverse set of tools:
```sh
terraform
wget
bat
nixpkgs-fmt
```
You can search for more packages in [nix packages](https://search.nixos.org/packages)
## Usage
The [`devShells` option](https://flake.parts/options/flake-parts.html#opt-perSystem.devShells) is used by the following command:
```sh
nix develop
```
You can have as many shells as you want, in this [flake.nix](./flake.nix), you also have
`another_env` which includes `curl`. To open it:
```sh
nix develop .#another_env
```
## Troubleshooting
### I get bash instead of my shell
`nix develop` was designed for Nixpkgs stdenv, which uses bash, so that you can troubleshoot a Nix build with it. If you use a different shell, you'll want to get just the variables instead.
There are 3 possible solutions:
First, using [direnv](https://direnv.net/) to manage your dev environments. See [direnv-guide](https://haskell.flake.page/direnv). This is the recommended approach.
Second is a simple-unreliable hack, which is adding a `shellHook` to `devShells`
```nix
devShells.default = pkgs.mkShell {
shellHook = ''
exec $SHELL
'';
};
```
You might get a lot different issues, use it at your own risk.
Lastly, there's `nix print-dev-env` which returns the variables - in case you're feeling adventurous, because this is far from a complete solution. See `nix print-dev-env --help`.

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@ -0,0 +1,63 @@
{
"nodes": {
"flake-parts": {
"inputs": {
"nixpkgs-lib": "nixpkgs-lib"
},
"locked": {
"lastModified": 1685662779,
"narHash": "sha256-cKDDciXGpMEjP1n6HlzKinN0H+oLmNpgeCTzYnsA2po=",
"owner": "hercules-ci",
"repo": "flake-parts",
"rev": "71fb97f0d875fd4de4994dfb849f2c75e17eb6c3",
"type": "github"
},
"original": {
"id": "flake-parts",
"type": "indirect"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1687412861,
"narHash": "sha256-Z/g0wbL68C+mSGerYS2quv9FXQ1RRP082cAC0Bh4vcs=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "e603dc5f061ca1d8a19b3ede6a8cf9c9fcba6cdc",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs-lib": {
"locked": {
"dir": "lib",
"lastModified": 1685564631,
"narHash": "sha256-8ywr3AkblY4++3lIVxmrWZFzac7+f32ZEhH/A8pNscI=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "4f53efe34b3a8877ac923b9350c874e3dcd5dc0a",
"type": "github"
},
"original": {
"dir": "lib",
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-parts": "flake-parts",
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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@ -0,0 +1,22 @@
{
description = "Description for the project";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
};
outputs = inputs@{ flake-parts, ... }:
flake-parts.lib.mkFlake { inherit inputs; } {
systems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" ];
perSystem = { config, self', inputs', pkgs, system, ... }: {
devShells.default = pkgs.mkShell {
nativeBuildInputs = with pkgs; [ terraform wget bat nixpkgs-fmt ];
};
devShells.another_env = pkgs.mkShell {
nativeBuildInputs = with pkgs; [ curl ];
};
};
};
}

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@ -3,6 +3,7 @@ let
inherit (lib)
mkOption
types
literalExpression
;
inherit (flake-parts-lib)
mkTransposedPerSystemModule
@ -17,6 +18,13 @@ mkTransposedPerSystemModule {
An attribute set of packages to be used as shells.
[`nix develop .#<name>`](https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-develop.html) will run `devShells.<name>`.
'';
example = literalExpression ''
{
default = pkgs.mkShell {
nativeBuildInputs = with pkgs; [ wget bat cargo ];
};
}
'';
};
file = ./devShells.nix;
}