use std::ffi::OsStr; use std::fs; use std::io::Write; use std::os::unix::fs::symlink; use std::path::{Path, PathBuf}; use std::process::Output; use anyhow::{Context, Result}; use assert_cmd::Command; use rand::distributions::Alphanumeric; use rand::{thread_rng, Rng}; use serde_json::json; /// Create a mock generation link. /// /// Creates the generation link using the specified version inside a mock profiles directory /// (mimicking /nix/var/nix/profiles). Returns the path to the generation link. pub fn setup_generation_link( tmpdir: &Path, profiles_directory: &Path, version: u64, ) -> Result { let toplevel = setup_toplevel(tmpdir).context("Failed to setup toplevel")?; // Explicitly set modification time so that snapshot test of os-release reliably works. filetime::set_file_mtime(&toplevel, filetime::FileTime::zero())?; let bootspec = json!({ "v1": { "init": format!("init-v{}", version), "initrd": toplevel.join("initrd"), "kernel": toplevel.join("kernel"), "kernelParams": [ "amd_iommu=on", "amd_iommu=pt", "iommu=pt", "kvm.ignore_msrs=1", "kvm.report_ignored_msrs=0", "udev.log_priority=3", "systemd.unified_cgroup_hierarchy=1", "loglevel=4" ], "label": "LanzaOS", "toplevel": toplevel, "system": "x86_64-linux", "specialisation": {}, "extensions": { "lanzaboote": { "osRelease": toplevel.join("os-release") } } } }); let generation_link_path = profiles_directory.join(format!("system-{}-link", version)); fs::create_dir(&generation_link_path)?; let bootspec_path = generation_link_path.join("boot.json"); let mut file = fs::File::create(bootspec_path)?; file.write_all(&serde_json::to_vec(&bootspec)?)?; Ok(generation_link_path) } /// Setup a mock toplevel inside a temporary directory. /// /// Accepts the temporary directory as a parameter so that the invoking function retains control of /// it (and when it goes out of scope). fn setup_toplevel(tmpdir: &Path) -> Result { // Generate a random toplevel name so that multiple toplevel paths can live alongside each // other in the same directory. let toplevel = tmpdir.join(format!("toplevel-{}", random_string(8))); fs::create_dir(&toplevel)?; let test_systemd = systemd_location_from_env()?; let test_systemd_stub = format!("{test_systemd}/lib/systemd/boot/efi/linuxx64.efi.stub"); let initrd_path = toplevel.join("initrd"); let kernel_path = toplevel.join("kernel"); let systemd_path = toplevel.join("systemd"); let nixos_version_path = toplevel.join("nixos-version"); let kernel_modules_path = toplevel.join("kernel-modules/lib/modules/6.1.1"); // To simplify the test setup, we use the systemd stub for all PE binaries used by lanzatool. // Lanzatool doesn't care whether its actually a kernel or initrd but only whether it can // manipulate the PE binary with objcopy and/or sign it with sbsigntool. For testing lanzatool // in isolation this should suffice. fs::copy(&test_systemd_stub, initrd_path)?; fs::copy(&test_systemd_stub, kernel_path)?; symlink(&test_systemd, systemd_path)?; fs::write(nixos_version_path, b"23.05")?; fs::create_dir_all(kernel_modules_path)?; Ok(toplevel) } fn random_string(length: usize) -> String { thread_rng() .sample_iter(&Alphanumeric) .take(length) .map(char::from) .collect() } /// Call the `lanzaboote install` command. pub fn lanzaboote_install( config_limit: u64, esp_mountpoint: &Path, generation_links: impl IntoIterator>, ) -> Result { // To simplify the test setup, we use the systemd stub here instead of the lanzaboote stub. See // the comment in setup_toplevel for details. let test_systemd = systemd_location_from_env()?; let test_systemd_stub = format!("{test_systemd}/lib/systemd/boot/efi/linuxx64.efi.stub"); let mut cmd = Command::cargo_bin("lzbt")?; let output = cmd .env("LANZABOOTE_STUB", test_systemd_stub) .arg("install") .arg("--public-key") .arg("tests/fixtures/uefi-keys/db.pem") .arg("--private-key") .arg("tests/fixtures/uefi-keys/db.key") .arg("--configuration-limit") .arg(config_limit.to_string()) .arg(esp_mountpoint) .args(generation_links) .output()?; // Print debugging output. // This is a weird hack to make cargo test capture the output. // See https://github.com/rust-lang/rust/issues/12309 print!("{}", String::from_utf8(output.stdout.clone())?); print!("{}", String::from_utf8(output.stderr.clone())?); // Also walk the entire ESP mountpoint and print each path for debugging for entry in walkdir::WalkDir::new(esp_mountpoint) { println!("{}", entry?.path().display()); } Ok(output) } /// Read location of systemd installation from an environment variable. fn systemd_location_from_env() -> Result { let error_msg = "TEST_SYSTEMD environment variable is not set. TEST_SYSTEMD has to point to a systemd installation. On a system with Nix installed, you can set it with: export TEST_SYSTEMD=$(nix-build '' -A systemd)"; std::env::var("TEST_SYSTEMD").context(error_msg) }