ic-build 0.17.6

Cargo and Wasm builds, exact inputs and retained artifact caches
Documentation 
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//! Real Cargo messages bind exact outputs and build-script exports before capture.
mod support;

use ic_build::{
    artifacts::CapturedArtifact,
    cargo::{
        execution::{communicate_cargo, select_cdylib_wasm},
        observation::schema::Message,
    },
};
use ic_host_process::{
    child::OwnedChild,
    tool::{OutputLimit, OutputLimits},
};
use std::{
    fs,
    path::Path,
    process::{Command, Stdio},
};

#[test]
fn reported_custom_libraries_and_exports_survive_shared_target_collisions() {
    let root = support::fs_fixture::unique_temp_directory("cargo-execution");
    fs::create_dir_all(root.join("captures")).unwrap();
    let target = root.join("target");
    let cargo = std::env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
    let mut retained = Vec::new();
    for (workspace, marker) in [("first", 1), ("second", 2)] {
        let directory = root.join(workspace);
        fs::create_dir_all(directory.join("src")).unwrap();
        let manifest = directory.join("Cargo.toml");
        fs::write(&manifest, "[workspace]\n[package]\nname='collision'\nversion='0.1.0'\nedition='2024'\n[lib]\nname='custom_library'\ncrate-type=['cdylib']\n").unwrap();
        fs::write(
            directory.join("src/lib.rs"),
            format!("#[unsafe(no_mangle)] pub extern \"C\" fn marker() -> u32 {{ {marker} }}\n"),
        )
        .unwrap();
        fs::write(directory.join("build.rs"), "fn main() { println!(\"cargo:rustc-env=CONSUMER_INPUT={}\", std::env::var(\"CARGO_MANIFEST_DIR\").unwrap()); }\n").unwrap();
        assert!(
            Command::new(&cargo)
                .current_dir(&directory)
                .args(["generate-lockfile", "--offline"])
                .status()
                .unwrap()
                .success()
        );
        let mut command = Command::new(&cargo);
        command
            .current_dir(&directory)
            .args([
                "build",
                "--lib",
                "--locked",
                "--offline",
                "--target",
                "wasm32-unknown-unknown",
                "--message-format=json-render-diagnostics",
            ])
            .env("CARGO_TARGET_DIR", &target)
            .stdin(Stdio::null())
            .stdout(Stdio::piped())
            .stderr(Stdio::piped());
        let mut child = OwnedChild::spawn_direct(&mut command).unwrap();
        let mut messages = Vec::new();
        let observed = communicate_cargo(
            &mut child,
            OutputLimits {
                stdout: OutputLimit::Truncate(0),
                stderr: OutputLimit::Truncate(1024 * 1024),
                timeout: None,
            },
            1024 * 1024,
            || false,
            |_, _| Ok(()),
            |message| {
                messages.push(message);
                Ok(())
            },
        );
        let evidence = observed.execution.unwrap();
        assert!(
            evidence.status.success(),
            "{}",
            String::from_utf8_lossy(&evidence.stderr)
        );
        observed.messages.unwrap();
        let script = messages
            .iter()
            .find_map(|message| {
                if let Message::BuildScriptExecuted(script) = message {
                    Some(script)
                } else {
                    None
                }
            })
            .unwrap();
        assert!(
            script
                .env
                .iter()
                .any(|(name, value)| name == "CONSUMER_INPUT" && Path::new(value) == directory)
        );
        let path = select_cdylib_wasm(&messages, &manifest).unwrap();
        assert_eq!(path.file_name().unwrap(), "custom_library.wasm");
        let bytes = fs::read(&path).unwrap();
        let capture =
            CapturedArtifact::capture(&path, &root.join("captures"), 128 * 1024 * 1024).unwrap();
        retained.push((path, bytes, capture));
    }
    assert_eq!(retained[0].0, retained[1].0);
    assert_ne!(retained[0].1, retained[1].1);
    for (_, bytes, capture) in &retained {
        assert_eq!(&fs::read(capture.path()).unwrap(), bytes);
    }
    assert_eq!(fs::read(&retained[0].0).unwrap(), retained[1].1);
    drop(retained);
    fs::remove_dir_all(root).unwrap();
}