status-react/nix/README.md

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# Description
This folder contains configuration for [Nix](https://nixos.org/), a purely functional package manager used by the Status app for its build process.
# Configuration
The main config file is [`nix/nix.conf`](/nix/nix.conf) and its main purpose is defining the [binary caches](https://nixos.org/nix/manual/#ch-basic-package-mgmt) which allow download of packages to avoid having to compile them yourself locally.
__NOTE:__ If you are in Asia you might want to add the `https://nix-cache-cn.status.im/` to be first in order of `substituters`. Removing `cache.nixos.org` could also help.
# Shell
In order to access an interactive Nix shell a user should run `make shell`.
The Nix shell is started in this repo via the [`nix/shell.sh`](/nix/shell.sh) script, which is a wrapper around the `nix-shell` command and is intended for use with our main [`Makefile`](/Makefile). This allows for an implicit use of `nix-shell` as the default shell in the `Makefile`.
By default the shell starts without any specific target platform, if you want to change that you should export the `TARGET_OS` env variable with the right value:
```bash
make shell TARGET_OS=android
```
This way your shell and all other nix commands should run in a setup that is tailored towards Android development.
For valid values you can check the [`nix/platform.nix`](/nix/platform.nix) file.