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---
tags:
- nix
- nixos
references:
- https://nixos.org/manual/nixos/unstable/#sec-writing-modules
- https://nixos.org/manual/nixpkgs/stable/#module-system-lib-evalModules
- https://nix.dev/tutorials/module-system/
- llk
---
Extra care must be taken when writing systemd services using Exec* due to interpolation and such. `utils.escapeSystemdExecArg` and `utils.escapeSystemdExecArg` exist.
```nix
{
options = {
name = mkOption {
type = type specification;
default = default value;
example = example value;
description = "Description for use in the NixOS manual.";
};
};
}
```
**A list of submodules**
```nix
{
options.mod = mkOption {
description = "submodule example";
type = with types; listOf (submodule {
options = {
foo = mkOption {
type = int;
};
bar = mkOption {
type = str;
};
};
});
};
}
```
**Testing**
```nix eval.nix
let
pkgs = import <nixpkgs> {};
res = pkgs.lib.evalModules {
modules = [./git-repos.nix];
};
in
res.config
```
`nix-instantiate --eval eval.nix`
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