picow/build.rs

use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
use std::process::Command;

use serde::Deserialize;

#[derive(Default, Deserialize)]
struct WirelessCredentials {
    wireless_credentials: HashMap<String, String>,
}

fn load_wireless_credentials() -> Option<WirelessCredentials> {
    let yaml_string = String::from_utf8(
        Command::new("sops")
            .arg("-d")
            .arg("secrets.yaml")
            .output()
            .ok()?
            .stdout,
    )
    .ok()?;

    serde_yaml::from_str(&yaml_string).ok()
}

fn main() {
    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());

    File::create(out.join("memory.x"))
        .unwrap()
        .write_all(include_bytes!("memory.x"))
        .unwrap();
    println!("cargo:rustc-link-search={}", out.display());

    let credentials = load_wireless_credentials()
        .unwrap_or_default()
        .wireless_credentials;

    let credential_entries: Vec<String> = credentials
        .into_iter()
        .map(|(ssid, password)| format!("(\"{ssid}\", \"{password}\")"))
        .collect();

    let credential_slice_string = format!("[{}]", credential_entries.join(", "));

    File::create(out.join("wireless-credentials.rs"))
        .unwrap()
        .write_all(credential_slice_string.as_bytes())
        .unwrap();

    println!("cargo:rerun-if-changed=memory.x");
    println!("cargo:rerun-if-changed=secrets.yaml");

    println!("cargo:rustc-link-arg-bins=--nmagic");
    println!("cargo:rustc-link-arg-bins=-Tlink.x");
    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
}