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# GSA Parser
## Build Instructions
First, install nix. This is a bit of an effort on a docker image.
The latest version of ymherklotz/polyhedral:1.0 has some of the config files you get when installing nix so everyone has it and if you kill a container you still have your configurations.
But nix is big so we need to use docker volumes and install it once with the follwing steps.
Create a volume that will be mounted to /nix.
It's important it's always mounted to /nix cos that's where nix gets installed.
```sh
docker volume create nix
docker run -itd --name gsa-parser -v nix:/nix -v <project_path_on_host>:<project_path_on_image> ymherklotz/polyhedral:1.0
```
Create a temporary user as whom we install nix (it doesn't allow installation as root).
The final command installs multi-user nix which allows root to run nix after installation.
``` sh
apt install curl bzip2 adduser
adduser --disabled-password --gecos '' nix-installer
chown nix-installer /nix
sudo -u nix-installer /bin/bash
cd /home/nix-installer
sh <(curl -L https://nixos.org/nix/install) --daemon
```
It's recommended to use `flake` in nix, which is experimental:
``` sh
nix-env -iA nixpkgs.nixUnstable
```
Then add the following to `/etc/nix/nix.conf`:
``` text
experimental-features = nix-command flakes
```
For faster compilation, use [cachix](https://www.cachix.org/) to download binary dependencies:
``` sh
nix-env -iA cachix -f https://cachix.org/api/v1/install
```
Then, activate the following caches:
``` sh
USER=root cachix use jmc
USER=root cachix use ymherklotz
```
Then navigate to this project's directory and build the project using:
``` sh
nix build
```
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