folk_builder/
runner.rs

1use std::path::Path;
2
3use anyhow::{Context, Result};
4use tempfile::TempDir;
5use tracing::info;
6
7use crate::codegen::{generate_cargo_toml, generate_main_rs};
8use crate::config::BuildConfig;
9
10pub fn build(cfg: &BuildConfig, output_dir: &str) -> Result<()> {
11    let tmp = TempDir::new().context("create temp dir")?;
12    let tmp_path = tmp.path();
13
14    // Write generated files
15    std::fs::create_dir_all(tmp_path.join("src"))?;
16    std::fs::write(tmp_path.join("Cargo.toml"), generate_cargo_toml(cfg))?;
17    std::fs::write(tmp_path.join("src/main.rs"), generate_main_rs(cfg))?;
18
19    info!(dir = %tmp_path.display(), "compiling custom binary");
20
21    // Run cargo build --release
22    let status = std::process::Command::new("cargo")
23        .args(["build", "--release"])
24        .current_dir(tmp_path)
25        .status()
26        .context("run cargo")?;
27
28    if !status.success() {
29        anyhow::bail!("cargo build failed with status {status}");
30    }
31
32    // Copy output binary
33    let binary_name = &cfg.build.output;
34    let src = tmp_path.join("target/release").join(binary_name);
35    let dst = Path::new(output_dir).join(binary_name);
36    std::fs::copy(&src, &dst)
37        .with_context(|| format!("copy {} → {}", src.display(), dst.display()))?;
38
39    info!(output = %dst.display(), "binary ready");
40    Ok(())
41}
folk_builder/runner.rs

folk_builder/
runner.rs
