openhuman/build.rs at v0.63.9 · dominikake/openhuman

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//! Build script for the `openhuman` core crate.

//!

//! Its sole job today is to generate the module list for the aggregated

//! `raw_coverage_all` integration test target. The `tests/raw_coverage/`

//! directory holds ~76 auto-generated `*_raw_coverage_e2e.rs` coverage suites

//! that were previously ~76 separate `tests/*.rs` integration targets. Each

//! separate target statically relinks the entire (very large) `openhuman`

//! rlib, so building the test suite paid ~76 full-crate link steps. Folding

//! them into a single target ([`tests/raw_coverage_all.rs`]) reduces that to

//! one link.

//!

//! We glob the directory at build time (rather than hand-maintaining a `mod`

//! list) so that any newly added `tests/raw_coverage/*.rs` file is picked up

//! automatically and cannot be silently skipped.

use std::env;

use std::fs;

use std::path::Path;

fn main() {

let manifest_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR must be set");

let tests_dir = Path::new(&manifest_dir).join("tests");

let raw_dir = tests_dir.join("raw_coverage");

// Re-run whenever a file is added to / removed from the directory.

println!("cargo:rerun-if-changed={}", raw_dir.display());

let mut entries: Vec<(String, String)> = Vec::new();

let read_dir = match fs::read_dir(&raw_dir) {

Ok(rd) => Some(rd),

// Source-only builds (e.g. the Docker image copies `src/` but not

// `tests/`) never compile the integration targets, so there is nothing

// to aggregate — emit an empty module list rather than breaking the

// build. But if `tests/` IS present and only `raw_coverage/` is missing,

// that's an accidental deletion: fail loudly so the suite can't be

// silently dropped.

Err(_) if !tests_dir.exists() => None,

Err(e) => panic!("failed to read {}: {e}", raw_dir.display()),

};

for entry in read_dir.into_iter().flatten().flatten() {

let path = entry.path();

if path.extension().and_then(|e| e.to_str()) != Some("rs") {

continue;

}

let stem = match path.file_stem().and_then(|s| s.to_str()) {

Some(s) => s.to_string(),

None => continue,

};

// Re-run if any individual test file's contents change.

println!("cargo:rerun-if-changed={}", path.display());

// Rust `#[path]` accepts forward slashes on every platform; the

// absolute path keeps resolution independent of where the generated

// file is `include!`d from.

let abs = path.display().to_string().replace('\\', "/");

entries.push((stem, abs));

}

// Deterministic order keeps the generated file stable across builds.

entries.sort();

let mut generated = String::from("// @generated by build.rs — do not edit.\n");

for (stem, abs) in &entries {

generated.push_str(&format!("#[path = \"{abs}\"]\nmod {stem};\n"));

}

let out_dir = env::var("OUT_DIR").expect("OUT_DIR must be set");

let out_path = Path::new(&out_dir).join("raw_coverage_mods.rs");

fs::write(&out_path, generated).expect("failed to write raw_coverage_mods.rs");

}

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