myc

main.rs (60540B)

---

 #![forbid(unsafe_code)]
 
 mod rshr_202_step_300_gate;
 mod rshr_202_step_300_platform;
 
 use std::{
     collections::BTreeSet,
     env, fmt, fs,
     io::{Read as _, Write as _},
     path::{Path, PathBuf},
     process::{Command, Stdio},
 };
 
 use flate2::{Compression, GzBuilder};
 use serde::{Deserialize, Serialize};
 use sha2::{Digest as _, Sha256};
 use tar::{Builder as TarBuilder, Header as TarHeader};
 use tempfile::{NamedTempFile, TempDir};
 
 const SERVICE: &str = "myc";
 const VERSION: &str = "0.1.0";
 const REPOSITORY: &str = "https://github.com/radrootslabs/myc";
 const RUST_VERSION: &str = "1.97.1";
 const HOST_FEATURE_PROFILE: &str = "service-host";
 const SOURCE_LOCK: &str = "radroots.service.source-lock.v3.toml";
 const CONFIG_EXAMPLE: &str = "contracts/services_hardening/config.v1.example.toml";
 const CONFIG_SCHEMA: &str = "contracts/services_hardening/config.v1.schema.json";
 const SYSTEMD_UNIT: &str = "packaging/systemd/myc@.service";
 const SUPPORTED_TARGETS: [&str; 2] = ["aarch64-unknown-linux-gnu", "x86_64-unknown-linux-gnu"];
 const OUTPUT_NAMES: [&str; 12] = [
     "LICENSE",
     "SHA256SUMS",
     "THIRD-PARTY-NOTICES.txt",
     "artifact-manifest.v1.json",
     "binary.tar.gz",
     "config.example.toml",
     "config.schema.json",
     "provenance-input.v1.json",
     SOURCE_LOCK,
     "sbom.cdx.json",
     "service-source.tar.gz",
     "systemd.service",
 ];
 const MAX_TEXT_BYTES: u64 = 1_048_576;
 const MAX_DOCUMENT_BYTES: u64 = 16_777_216;
 const MAX_METADATA_BYTES: u64 = 33_554_432;
 const MAX_BINARY_BYTES: u64 = 536_870_912;
 const MAX_SOURCE_ARCHIVE_BYTES: u64 = 1_073_741_824;
 const MAX_TRACKED_FILES: usize = 4_096;
 const MAX_PACKAGES: usize = 8_192;
 const COPY_BUFFER_BYTES: usize = 65_536;
 const SECRET_PATTERNS: [&[u8]; 7] = [
     b"-----BEGIN PRIVATE KEY-----",
     b"-----BEGIN RSA PRIVATE KEY-----",
     b"-----BEGIN EC PRIVATE KEY-----",
     b"-----BEGIN OPENSSH PRIVATE KEY-----",
     b"github_pat_",
     b"ghp_",
     b"xoxb-",
 ];
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum Mode {
     Check,
     Write,
 }
 
 #[derive(Debug)]
 struct NativeReleaseArgs {
     mode: Mode,
     target: String,
     binary: PathBuf,
     output: PathBuf,
     source_date_epoch: u32,
 }
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum ReleaseError {
     InvalidArguments,
     InvalidSource,
     DirtySource,
     InvalidBinary,
     InvalidOutput,
     InvalidMetadata,
     InvalidSourceLock,
     ProtectedMaterial,
     StaleOutput,
     Generation,
 }
 
 impl ReleaseError {
     const fn code(self) -> &'static str {
         match self {
             Self::InvalidArguments => "invalid_arguments",
             Self::InvalidSource => "invalid_source",
             Self::DirtySource => "dirty_source",
             Self::InvalidBinary => "invalid_binary",
             Self::InvalidOutput => "invalid_output",
             Self::InvalidMetadata => "invalid_metadata",
             Self::InvalidSourceLock => "invalid_source_lock",
             Self::ProtectedMaterial => "protected_material_detected",
             Self::StaleOutput => "stale_output",
             Self::Generation => "generation_failure",
         }
     }
 }
 
 impl fmt::Display for ReleaseError {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         formatter.write_str(match self {
             Self::InvalidArguments => "native release arguments are invalid",
             Self::InvalidSource => "native release source is invalid",
             Self::DirtySource => "native release source is not an exact clean revision",
             Self::InvalidBinary => "native release binary is invalid",
             Self::InvalidOutput => "native release output is invalid",
             Self::InvalidMetadata => "native release metadata is invalid",
             Self::InvalidSourceLock => "native release source lock is invalid",
             Self::ProtectedMaterial => "native release input contains protected material",
             Self::StaleOutput => "native release artifact set is absent or stale",
             Self::Generation => "native release artifacts could not be generated",
         })
     }
 }
 
 impl std::error::Error for ReleaseError {}
 
 #[derive(Clone, Debug, Deserialize)]
 struct CargoMetadata {
     packages: Vec<CargoPackage>,
     workspace_members: Vec<String>,
     resolve: Option<CargoResolve>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 struct CargoPackage {
     id: String,
     name: String,
     version: String,
     source: Option<String>,
     checksum: Option<String>,
     license: Option<String>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 struct CargoResolve {
     nodes: Vec<CargoNode>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 struct CargoNode {
     id: String,
     dependencies: Vec<String>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct SourceLock {
     schema: String,
     contract_version: u32,
     service: String,
     repository: String,
     revision: String,
     architecture: String,
     workspace_catalog_sha256: String,
     version: String,
     source_archive_sha256: String,
     source_archive_contract: SourceArchiveContract,
     cargo_lock_sha256: String,
     rust_version: String,
     host_feature_profile: String,
     nix: NixEvidence,
     artifact_contract: ArtifactContract,
     sqlite: SqliteContract,
     contract_versions: ContractVersions,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct NixEvidence {
     material: String,
     lib_revision: String,
     public_input_lock: PublicInputLock,
     parent_result: ParentResult,
     supported_systems: Vec<String>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct PublicInputLock {
     path: String,
     sha256: String,
     binding: String,
     mutable_reference: String,
     lib_input: String,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct ParentResult {
     embedded_in_public_input_lock: bool,
     embedded_in_source_lock: bool,
     storage: String,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct SourceArchiveContract {
     binding: String,
     format: String,
     compression: String,
     compression_timestamp: String,
     entry_order: String,
     path_prefix: String,
     file_mode: String,
     uid: u32,
     gid: u32,
     uname: String,
     gname: String,
     mtime: String,
     pax_headers: String,
     directory_entries: String,
     symlinks: String,
     hardlinks: String,
     submodules: String,
     trailer: String,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct ArtifactContract {
     path: String,
     sha256: String,
     binding: String,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct SqliteContract {
     high_level_authority: String,
     second_pool_connection_query_transaction_migration_authority: String,
     incremental_backup_adapter: String,
     native_linkage_count: u32,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(deny_unknown_fields)]
 struct ContractVersions {
     config: u32,
     state: u32,
     admin: u32,
     status: u32,
     provider: u32,
 }
 
 #[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd, Serialize)]
 struct ArtifactRecord {
     path: String,
     byte_length: u64,
     sha256: String,
 }
 
 #[derive(Debug, Serialize)]
 struct ArtifactManifest {
     schema: &'static str,
     contract_version: u32,
     service: &'static str,
     version: &'static str,
     target: String,
     source_date_epoch: u32,
     service_repository: &'static str,
     service_revision: String,
     lib_repository: String,
     lib_revision: String,
     rust_version: &'static str,
     host_feature_profile: &'static str,
     contract_versions: ContractVersions,
     protected_material_included: bool,
     nix_qualified: bool,
     oci_included: bool,
     artifacts: Vec<ArtifactRecord>,
 }
 
 #[derive(Debug, Serialize)]
 struct ProvenanceInput {
     schema: &'static str,
     contract_version: u32,
     predicate_type: &'static str,
     build_type: &'static str,
     builder_id: &'static str,
     service: &'static str,
     version: &'static str,
     target: String,
     source_date_epoch: u32,
     service_repository: &'static str,
     service_revision: String,
     lib_repository: String,
     lib_revision: String,
     source_lock_sha256: String,
     manifest_sha256: String,
     subjects: Vec<ArtifactRecord>,
     signing_required: bool,
     signed: bool,
 }
 
 #[derive(Debug, Serialize)]
 struct CycloneDxBom {
     #[serde(rename = "bomFormat")]
     bom_format: &'static str,
     #[serde(rename = "specVersion")]
     spec_version: &'static str,
     version: u32,
     metadata: SbomMetadata,
     components: Vec<SbomComponent>,
     dependencies: Vec<SbomDependency>,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomMetadata {
     component: SbomRootComponent,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomRootComponent {
     #[serde(rename = "type")]
     component_type: &'static str,
     name: &'static str,
     version: &'static str,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomComponent {
     #[serde(rename = "type")]
     component_type: &'static str,
     #[serde(rename = "bom-ref")]
     bom_ref: String,
     name: String,
     version: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     licenses: Option<Vec<SbomLicenseChoice>>,
     properties: Vec<SbomProperty>,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomLicenseChoice {
     expression: String,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomProperty {
     name: &'static str,
     value: String,
 }
 
 #[derive(Debug, Serialize)]
 struct SbomDependency {
     #[serde(rename = "ref")]
     reference: String,
     #[serde(rename = "dependsOn")]
     depends_on: Vec<String>,
 }
 
 fn main() {
     if let Err(error) = run_main() {
         eprintln!("{}: {}", error.code(), error);
         std::process::exit(1);
     }
 }
 
 fn run_main() -> Result<(), ReleaseError> {
     let mut arguments = env::args().skip(1);
     match arguments.next().as_deref() {
         Some("native-release") => {
             let args = parse_native_release_args(arguments.collect())?;
             native_release(&workspace_root(), &args)
         }
         Some("rshr-step-300-gate") => {
             let args = parse_rshr_step_300_gate_args(arguments.collect())?;
             rshr_202_step_300_gate::run(args).map_err(|_| ReleaseError::Generation)
         }
         Some("rshr-step-300-platform-probe") if arguments.next().is_none() => {
             rshr_202_step_300_platform::run().map_err(|_| ReleaseError::Generation)
         }
         _ => Err(ReleaseError::InvalidArguments),
     }
 }
 
 fn parse_rshr_step_300_gate_args(
     values: Vec<String>,
 ) -> Result<rshr_202_step_300_gate::Arguments, ReleaseError> {
     let mut step = None;
     let mut check_id = None;
     let mut source_revision = None;
     let mut source_tree = None;
     let mut candidate_digest = None;
     let mut platform = None;
     let mut execution_request_sha256 = None;
     for value in values {
         let (name, value) = value
             .split_once('=')
             .ok_or(ReleaseError::InvalidArguments)?;
         let slot = match name {
             "--check-id" => &mut check_id,
             "--source-revision" => &mut source_revision,
             "--source-tree" => &mut source_tree,
             "--candidate-digest" => &mut candidate_digest,
             "--platform" => &mut platform,
             "--execution-request-sha256" => &mut execution_request_sha256,
             "--step" => {
                 let parsed = value
                     .parse::<u16>()
                     .map_err(|_| ReleaseError::InvalidArguments)?;
                 if step.replace(parsed).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
                 continue;
             }
             _ => return Err(ReleaseError::InvalidArguments),
         };
         if value.is_empty() || slot.replace(value.to_owned()).is_some() {
             return Err(ReleaseError::InvalidArguments);
         }
     }
     Ok(rshr_202_step_300_gate::Arguments {
         step: step.ok_or(ReleaseError::InvalidArguments)?,
         check_id: check_id.ok_or(ReleaseError::InvalidArguments)?,
         source_revision: source_revision.ok_or(ReleaseError::InvalidArguments)?,
         source_tree: source_tree.ok_or(ReleaseError::InvalidArguments)?,
         candidate_digest: candidate_digest.ok_or(ReleaseError::InvalidArguments)?,
         platform: platform.ok_or(ReleaseError::InvalidArguments)?,
         execution_request_sha256: execution_request_sha256.ok_or(ReleaseError::InvalidArguments)?,
     })
 }
 
 fn workspace_root() -> PathBuf {
     Path::new(env!("CARGO_MANIFEST_DIR"))
         .parent()
         .and_then(Path::parent)
         .expect("xtask is nested at tools/xtask")
         .to_path_buf()
 }
 
 fn parse_native_release_args(values: Vec<String>) -> Result<NativeReleaseArgs, ReleaseError> {
     let mut mode = None;
     let mut target = None;
     let mut binary = None;
     let mut output = None;
     let mut source_date_epoch = None;
     let mut index = 0;
     while index < values.len() {
         let value = values
             .get(index + 1)
             .ok_or(ReleaseError::InvalidArguments)?;
         match values[index].as_str() {
             "--mode" => {
                 let parsed = match value.as_str() {
                     "check" => Mode::Check,
                     "write" => Mode::Write,
                     _ => return Err(ReleaseError::InvalidArguments),
                 };
                 if mode.replace(parsed).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
             }
             "--target" => {
                 if target.replace(value.clone()).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
             }
             "--binary" => {
                 if binary.replace(PathBuf::from(value)).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
             }
             "--output" => {
                 if output.replace(PathBuf::from(value)).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
             }
             "--source-date-epoch" => {
                 let parsed = value
                     .parse::<u32>()
                     .ok()
                     .filter(|value| *value > 0)
                     .ok_or(ReleaseError::InvalidArguments)?;
                 if source_date_epoch.replace(parsed).is_some() {
                     return Err(ReleaseError::InvalidArguments);
                 }
             }
             _ => return Err(ReleaseError::InvalidArguments),
         }
         index += 2;
     }
     let args = NativeReleaseArgs {
         mode: mode.ok_or(ReleaseError::InvalidArguments)?,
         target: target.ok_or(ReleaseError::InvalidArguments)?,
         binary: binary.ok_or(ReleaseError::InvalidArguments)?,
         output: output.ok_or(ReleaseError::InvalidArguments)?,
         source_date_epoch: source_date_epoch.ok_or(ReleaseError::InvalidArguments)?,
     };
     if !SUPPORTED_TARGETS.contains(&args.target.as_str())
         || !args.binary.is_absolute()
         || !args.output.is_absolute()
     {
         return Err(ReleaseError::InvalidArguments);
     }
     Ok(args)
 }
 
 fn native_release(root: &Path, args: &NativeReleaseArgs) -> Result<(), ReleaseError> {
     validate_source_root(root)?;
     validate_clean_source(root)?;
     let initial_head = git_capture(root, &["rev-parse", "HEAD"], 128)?;
     let initial_head = exact_line(&initial_head).ok_or(ReleaseError::InvalidSource)?;
     if !lower_hex(initial_head, 40) {
         return Err(ReleaseError::InvalidSource);
     }
     validate_binary(&args.binary, &args.target)?;
     validate_output_path(root, &args.output)?;
     let source_lock = read_source_lock(root)?;
     let metadata = cargo_metadata(root)?;
     validate_metadata(&metadata)?;
 
     let parent = args.output.parent().ok_or(ReleaseError::InvalidOutput)?;
     let staging = tempfile::Builder::new()
         .prefix(".myc-native-release-")
         .tempdir_in(parent)
         .map_err(|_| ReleaseError::Generation)?;
     let stage = staging.path();
     set_directory_permissions(stage)?;
 
     copy_bounded(
         &root.join("LICENSE"),
         &stage.join("LICENSE"),
         MAX_TEXT_BYTES,
     )?;
     copy_bounded(
         &root.join(CONFIG_EXAMPLE),
         &stage.join("config.example.toml"),
         MAX_TEXT_BYTES,
     )?;
     copy_bounded(
         &root.join(CONFIG_SCHEMA),
         &stage.join("config.schema.json"),
         MAX_TEXT_BYTES,
     )?;
     copy_bounded(
         &root.join(SYSTEMD_UNIT),
         &stage.join("systemd.service"),
         MAX_TEXT_BYTES,
     )?;
     copy_bounded(
         &root.join(SOURCE_LOCK),
         &stage.join(SOURCE_LOCK),
         MAX_TEXT_BYTES,
     )?;
     create_binary_archive(
         &args.binary,
         &stage.join("binary.tar.gz"),
         &args.target,
         args.source_date_epoch,
     )?;
     create_source_archive(
         root,
         &stage.join("service-source.tar.gz"),
         args.source_date_epoch,
     )?;
     let (sbom, notices) = supply_chain_documents(&metadata)?;
     write_json(&stage.join("sbom.cdx.json"), &sbom)?;
     write_generated(&stage.join("THIRD-PARTY-NOTICES.txt"), notices.as_bytes())?;
 
     let source_lock_sha256 = hash_regular(&stage.join(SOURCE_LOCK), MAX_TEXT_BYTES)?.sha256;
     let payload = inventory_records(stage)?;
     let manifest = ArtifactManifest {
         schema: "radroots.service.release-artifacts.v1",
         contract_version: 1,
         service: SERVICE,
         version: VERSION,
         target: args.target.clone(),
         source_date_epoch: args.source_date_epoch,
         service_repository: REPOSITORY,
         service_revision: initial_head.to_owned(),
         lib_repository: source_lock.repository.clone(),
         lib_revision: source_lock.revision.clone(),
         rust_version: RUST_VERSION,
         host_feature_profile: HOST_FEATURE_PROFILE,
         contract_versions: source_lock.contract_versions.clone(),
         protected_material_included: false,
         nix_qualified: true,
         oci_included: false,
         artifacts: payload,
     };
     write_json(&stage.join("artifact-manifest.v1.json"), &manifest)?;
     let manifest_sha256 =
         hash_regular(&stage.join("artifact-manifest.v1.json"), MAX_DOCUMENT_BYTES)?.sha256;
     let provenance = ProvenanceInput {
         schema: "radroots.service.provenance-input.v1",
         contract_version: 1,
         predicate_type: "https://slsa.dev/provenance/v1",
         build_type: "https://radroots.dev/contracts/myc-native-release/v2",
         builder_id: "https://radroots.dev/builders/myc-native-release/v2",
         service: SERVICE,
         version: VERSION,
         target: args.target.clone(),
         source_date_epoch: args.source_date_epoch,
         service_repository: REPOSITORY,
         service_revision: initial_head.to_owned(),
         lib_repository: source_lock.repository,
         lib_revision: source_lock.revision,
         source_lock_sha256,
         manifest_sha256,
         subjects: inventory_records(stage)?,
         signing_required: true,
         signed: false,
     };
     write_json(&stage.join("provenance-input.v1.json"), &provenance)?;
     write_checksums(stage)?;
     validate_exact_inventory(stage)?;
     let expected = inventory_records(stage)?;
 
     validate_clean_source(root)?;
     if exact_line(&git_capture(root, &["rev-parse", "HEAD"], 128)?) != Some(initial_head) {
         return Err(ReleaseError::DirtySource);
     }
 
     if args.output.exists() {
         compare_output(&args.output, &expected)?;
         sync_directory(&args.output)?;
         sync_directory(parent)?;
         return Ok(());
     }
     if args.mode == Mode::Check {
         return Err(ReleaseError::StaleOutput);
     }
     sync_directory(stage)?;
     publish_directory(stage, &args.output)?;
     sync_directory(parent)?;
     compare_output(&args.output, &expected)
 }
 
 fn validate_source_root(root: &Path) -> Result<(), ReleaseError> {
     if !root.is_absolute()
         || fs::symlink_metadata(root)
             .map(|metadata| metadata.file_type().is_symlink() || !metadata.is_dir())
             .unwrap_or(true)
         || root.join("docs").exists()
         || root.join(".github").exists()
         || root.join(".act").exists()
     {
         return Err(ReleaseError::InvalidSource);
     }
     for required in [
         "Cargo.toml",
         "Cargo.lock",
         "LICENSE",
         SOURCE_LOCK,
         CONFIG_EXAMPLE,
         CONFIG_SCHEMA,
         SYSTEMD_UNIT,
     ] {
         validate_regular(
             &root.join(required),
             MAX_DOCUMENT_BYTES,
             ReleaseError::InvalidSource,
         )?;
     }
     Ok(())
 }
 
 fn validate_clean_source(root: &Path) -> Result<(), ReleaseError> {
     for arguments in [
         &["diff", "--quiet", "--"] as &[&str],
         &["diff", "--cached", "--quiet", "--"],
     ] {
         let status = Command::new("git")
             .args(arguments)
             .current_dir(root)
             .stdin(Stdio::null())
             .stdout(Stdio::null())
             .stderr(Stdio::null())
             .status()
             .map_err(|_| ReleaseError::DirtySource)?;
         if !status.success() {
             return Err(ReleaseError::DirtySource);
         }
     }
     let untracked = command_capture_bounded(
         Command::new("git")
             .args(["ls-files", "--others", "--exclude-standard", "-z"])
             .current_dir(root),
         1,
         ReleaseError::DirtySource,
     )?;
     if !untracked.is_empty() {
         return Err(ReleaseError::DirtySource);
     }
     Ok(())
 }
 
 fn validate_binary(path: &Path, target: &str) -> Result<(), ReleaseError> {
     open_binary(path, target).map(|_| ())
 }
 
 fn validate_output_path(root: &Path, output: &Path) -> Result<(), ReleaseError> {
     let parent = output.parent().ok_or(ReleaseError::InvalidOutput)?;
     let canonical_root = fs::canonicalize(root).map_err(|_| ReleaseError::InvalidSource)?;
     let canonical_parent = fs::canonicalize(parent).map_err(|_| ReleaseError::InvalidOutput)?;
     if output == Path::new("/")
         || output.components().any(|component| {
             matches!(
                 component,
                 std::path::Component::CurDir
                     | std::path::Component::ParentDir
                     | std::path::Component::Prefix(_)
             )
         })
         || canonical_parent.starts_with(canonical_root)
         || fs::symlink_metadata(parent)
             .map(|metadata| metadata.file_type().is_symlink() || !metadata.is_dir())
             .unwrap_or(true)
         || output
             .file_name()
             .and_then(|value| value.to_str())
             .is_none_or(|value| value.is_empty() || value == "." || value == "..")
     {
         return Err(ReleaseError::InvalidOutput);
     }
     match fs::symlink_metadata(output) {
         Ok(metadata) if metadata.file_type().is_symlink() || !metadata.is_dir() => {
             return Err(ReleaseError::InvalidOutput);
         }
         Ok(_) => {}
         Err(error) if error.kind() == std::io::ErrorKind::NotFound => {}
         Err(_) => return Err(ReleaseError::InvalidOutput),
     }
     Ok(())
 }
 
 fn read_source_lock(root: &Path) -> Result<SourceLock, ReleaseError> {
     let bytes = read_bounded(
         &root.join(SOURCE_LOCK),
         MAX_TEXT_BYTES,
         ReleaseError::InvalidSourceLock,
     )?;
     let text = std::str::from_utf8(&bytes).map_err(|_| ReleaseError::InvalidSourceLock)?;
     let lock: SourceLock = toml::from_str(text).map_err(|_| ReleaseError::InvalidSourceLock)?;
     let cargo_lock = hash_regular(&root.join("Cargo.lock"), MAX_DOCUMENT_BYTES)?;
     let flake_lock = hash_regular(&root.join("flake.lock"), MAX_DOCUMENT_BYTES)?;
     let artifact_contract = hash_regular(
         &root.join("contracts/release/myc-artifact-contract.v3.json"),
         MAX_DOCUMENT_BYTES,
     )?;
     let revisions = cargo_dependency_revisions(root)?;
     if lock.schema != "radroots.service.source-lock.v3"
         || lock.contract_version != 3
         || lock.service != SERVICE
         || lock.repository != "https://github.com/radrootslabs/lib"
         || !lower_hex(&lock.revision, 40)
         || lock.architecture != "radroots.crates.release.v2"
         || !lower_hex(&lock.workspace_catalog_sha256, 64)
         || lock.version != "0.1.0-alpha"
         || !lower_hex(&lock.source_archive_sha256, 64)
         || lock.cargo_lock_sha256 != cargo_lock.sha256
         || lock.rust_version != RUST_VERSION
         || lock.host_feature_profile != HOST_FEATURE_PROFILE
         || lock.source_archive_contract.binding
             != "sha256_of_canonical_exact_lib_revision_tree_archive"
         || lock.source_archive_contract.format != "ustar"
         || lock.source_archive_contract.compression != "none"
         || lock.source_archive_contract.compression_timestamp != "not_applicable"
         || lock.source_archive_contract.entry_order != "bytewise_git_path"
         || lock.source_archive_contract.path_prefix != "none"
         || lock.source_archive_contract.file_mode != "git_index_100644_or_100755"
         || lock.source_archive_contract.uid != 0
         || lock.source_archive_contract.gid != 0
         || !lock.source_archive_contract.uname.is_empty()
         || !lock.source_archive_contract.gname.is_empty()
         || lock.source_archive_contract.mtime != "lib_revision_commit_timestamp"
         || lock.source_archive_contract.pax_headers != "forbidden"
         || lock.source_archive_contract.directory_entries != "omitted"
         || lock.source_archive_contract.symlinks != "forbidden"
         || lock.source_archive_contract.hardlinks != "forbidden"
         || lock.source_archive_contract.submodules != "forbidden"
         || lock.source_archive_contract.trailer != "two_zero_blocks"
         || lock.nix.material != "qualified"
         || lock.nix.lib_revision != lock.revision
         || lock.nix.supported_systems != ["aarch64-darwin", "x86_64-linux"]
         || lock.nix.public_input_lock.path != "flake.lock"
         || lock.nix.public_input_lock.sha256 != flake_lock.sha256
         || lock.nix.public_input_lock.binding != "exact_regular_file_bytes"
         || lock.nix.public_input_lock.mutable_reference != "forbidden"
         || lock.nix.public_input_lock.lib_input != "lib"
         || lock.nix.parent_result.embedded_in_public_input_lock
         || lock.nix.parent_result.embedded_in_source_lock
         || lock.nix.parent_result.storage != "separate_generation_scoped_evidence"
         || lock.artifact_contract.path != "contracts/release/myc-artifact-contract.v3.json"
         || lock.artifact_contract.sha256 != artifact_contract.sha256
         || lock.artifact_contract.binding != "exact_regular_file_bytes_in_same_source_revision"
         || lock.sqlite.high_level_authority != "sqlx_only"
         || lock
             .sqlite
             .second_pool_connection_query_transaction_migration_authority
             != "forbidden"
         || lock.sqlite.incremental_backup_adapter != "sealed_native_sqlx_owned_locked_handle_only"
         || lock.sqlite.native_linkage_count != 1
         || revisions != BTreeSet::from([lock.revision.clone()])
         || [
             lock.contract_versions.config,
             lock.contract_versions.state,
             lock.contract_versions.admin,
             lock.contract_versions.status,
             lock.contract_versions.provider,
         ]
         .contains(&0)
     {
         return Err(ReleaseError::InvalidSourceLock);
     }
     Ok(lock)
 }
 
 fn cargo_dependency_revisions(root: &Path) -> Result<BTreeSet<String>, ReleaseError> {
     let bytes = read_bounded(
         &root.join("Cargo.toml"),
         MAX_TEXT_BYTES,
         ReleaseError::InvalidSourceLock,
     )?;
     let value: toml::Value =
         toml::from_str(std::str::from_utf8(&bytes).map_err(|_| ReleaseError::InvalidSourceLock)?)
             .map_err(|_| ReleaseError::InvalidSourceLock)?;
     let dependencies = value
         .get("dependencies")
         .and_then(toml::Value::as_table)
         .ok_or(ReleaseError::InvalidSourceLock)?;
     let mut revisions = BTreeSet::new();
     let mut count = 0_usize;
     for (name, dependency) in dependencies {
         if !name.starts_with("radroots_") {
             continue;
         }
         count += 1;
         let table = dependency
             .as_table()
             .ok_or(ReleaseError::InvalidSourceLock)?;
         if table.get("git").and_then(toml::Value::as_str)
             != Some("https://github.com/radrootslabs/lib")
             || table.contains_key("path")
             || table.contains_key("branch")
             || table.contains_key("tag")
         {
             return Err(ReleaseError::InvalidSourceLock);
         }
         revisions.insert(
             table
                 .get("rev")
                 .and_then(toml::Value::as_str)
                 .filter(|revision| lower_hex(revision, 40))
                 .ok_or(ReleaseError::InvalidSourceLock)?
                 .to_owned(),
         );
     }
     if count != 11 {
         return Err(ReleaseError::InvalidSourceLock);
     }
     Ok(revisions)
 }
 
 fn cargo_metadata(root: &Path) -> Result<CargoMetadata, ReleaseError> {
     let bytes = command_capture_bounded(
         Command::new("cargo")
             .args(["metadata", "--format-version", "1", "--locked", "--offline"])
             .current_dir(root),
         MAX_METADATA_BYTES,
         ReleaseError::InvalidMetadata,
     )?;
     serde_json::from_slice(&bytes).map_err(|_| ReleaseError::InvalidMetadata)
 }
 
 fn validate_metadata(metadata: &CargoMetadata) -> Result<(), ReleaseError> {
     if metadata.packages.is_empty()
         || metadata.packages.len() > MAX_PACKAGES
         || metadata.workspace_members.len() != 2
         || metadata.resolve.is_none()
         || !metadata
             .packages
             .iter()
             .any(|package| package.name == SERVICE && package.version == VERSION)
     {
         return Err(ReleaseError::InvalidMetadata);
     }
     Ok(())
 }
 
 fn create_binary_archive(
     binary: &Path,
     output: &Path,
     target: &str,
     epoch: u32,
 ) -> Result<(), ReleaseError> {
     let mut input = open_binary(binary, target)?;
     let metadata = input.metadata().map_err(|_| ReleaseError::InvalidBinary)?;
     let file = create_new(output)?;
     let encoder = GzBuilder::new().mtime(epoch).write(
         BoundedWriter::new(file, MAX_BINARY_BYTES + MAX_TEXT_BYTES),
         Compression::best(),
     );
     let mut tar = TarBuilder::new(encoder);
     tar.mode(tar::HeaderMode::Deterministic);
     let mut header = TarHeader::new_gnu();
     header.set_size(metadata.len());
     header.set_mode(0o755);
     header.set_uid(0);
     header.set_gid(0);
     header.set_mtime(u64::from(epoch));
     header.set_cksum();
     tar.append_data(
         &mut header,
         format!("myc-{VERSION}-{target}/myc"),
         &mut input,
     )
     .map_err(|_| ReleaseError::Generation)?;
     let encoder = tar.into_inner().map_err(|_| ReleaseError::Generation)?;
     encoder
         .finish()
         .map_err(|_| ReleaseError::Generation)?
         .sync_all()
         .map_err(|_| ReleaseError::Generation)
 }
 
 fn create_source_archive(root: &Path, output: &Path, epoch: u32) -> Result<(), ReleaseError> {
     let work = TempDir::new().map_err(|_| ReleaseError::Generation)?;
     let source = work.path().join(format!("myc-{VERSION}-source"));
     fs::create_dir(&source).map_err(|_| ReleaseError::Generation)?;
     extract_exact_head(root, &source, work.path())?;
     let tracked = count_tree(&source)?;
     if tracked == 0 || tracked > MAX_TRACKED_FILES {
         return Err(ReleaseError::InvalidSource);
     }
     let vendor_config = command_capture_bounded(
         Command::new("cargo")
             .args(["vendor", "--locked", "--versioned-dirs", "vendor"])
             .current_dir(&source),
         MAX_TEXT_BYTES,
         ReleaseError::Generation,
     )?;
     let cargo_config = source.join(".cargo/config.toml");
     let mut config = read_bounded(&cargo_config, MAX_TEXT_BYTES, ReleaseError::Generation)?;
     config.extend_from_slice(b"\n");
     config.extend_from_slice(&vendor_config);
     if config.len() as u64 > MAX_TEXT_BYTES {
         return Err(ReleaseError::Generation);
     }
     fs::write(&cargo_config, &config).map_err(|_| ReleaseError::Generation)?;
     let _ = command_capture_bounded(
         Command::new("cargo")
             .args(["metadata", "--format-version", "1", "--locked", "--offline"])
             .current_dir(&source),
         MAX_METADATA_BYTES,
         ReleaseError::Generation,
     )?;
     create_tree_archive(&source, output, epoch)
 }
 
 fn extract_exact_head(root: &Path, destination: &Path, work: &Path) -> Result<(), ReleaseError> {
     let archive = work.join("source-head.tar");
     let archive_file = fs::OpenOptions::new()
         .create_new(true)
         .write(true)
         .open(&archive)
         .map_err(|_| ReleaseError::Generation)?;
     let status = Command::new("git")
         .args(["archive", "--format=tar", "HEAD"])
         .current_dir(root)
         .stdin(Stdio::null())
         .stdout(Stdio::from(archive_file))
         .stderr(Stdio::null())
         .status()
         .map_err(|_| ReleaseError::InvalidSource)?;
     if !status.success() {
         return Err(ReleaseError::InvalidSource);
     }
     validate_regular(
         &archive,
         MAX_SOURCE_ARCHIVE_BYTES,
         ReleaseError::InvalidSource,
     )?;
     let file = fs::File::open(archive).map_err(|_| ReleaseError::InvalidSource)?;
     tar::Archive::new(file)
         .unpack(destination)
         .map_err(|_| ReleaseError::InvalidSource)
 }
 
 fn count_tree(root: &Path) -> Result<usize, ReleaseError> {
     let mut count = 0_usize;
     let mut pending = vec![root.to_path_buf()];
     while let Some(directory) = pending.pop() {
         let entries = fs::read_dir(directory).map_err(|_| ReleaseError::InvalidSource)?;
         for entry in entries {
             let entry = entry.map_err(|_| ReleaseError::InvalidSource)?;
             let kind = entry.file_type().map_err(|_| ReleaseError::InvalidSource)?;
             if kind.is_symlink() || (!kind.is_file() && !kind.is_dir()) {
                 return Err(ReleaseError::InvalidSource);
             }
             if kind.is_dir() {
                 pending.push(entry.path());
             } else {
                 count = count.checked_add(1).ok_or(ReleaseError::InvalidSource)?;
                 if count > MAX_TRACKED_FILES {
                     return Err(ReleaseError::InvalidSource);
                 }
             }
         }
     }
     Ok(count)
 }
 
 #[cfg(unix)]
 fn open_binary(path: &Path, target: &str) -> Result<fs::File, ReleaseError> {
     use rustix::fs::{Mode as FileMode, OFlags};
     use std::io::Seek as _;
     use std::os::unix::fs::PermissionsExt as _;
 
     let descriptor = rustix::fs::open(
         path,
         OFlags::RDONLY | OFlags::CLOEXEC | OFlags::NOFOLLOW | OFlags::NONBLOCK,
         FileMode::empty(),
     )
     .map_err(|_| ReleaseError::InvalidBinary)?;
     let mut file = fs::File::from(descriptor);
     let metadata = file.metadata().map_err(|_| ReleaseError::InvalidBinary)?;
     if !metadata.is_file()
         || metadata.len() < 20
         || metadata.len() > MAX_BINARY_BYTES
         || metadata.permissions().mode() & 0o111 == 0
     {
         return Err(ReleaseError::InvalidBinary);
     }
     let mut header = [0_u8; 20];
     file.read_exact(&mut header)
         .map_err(|_| ReleaseError::InvalidBinary)?;
     file.rewind().map_err(|_| ReleaseError::InvalidBinary)?;
     let expected_machine = match target {
         "x86_64-unknown-linux-gnu" => 62_u16,
         "aarch64-unknown-linux-gnu" => 183_u16,
         _ => return Err(ReleaseError::InvalidBinary),
     };
     if header[..4] != [0x7f, b'E', b'L', b'F']
         || header[4] != 2
         || header[5] != 1
         || header[6] != 1
         || ![0_u8, 3_u8].contains(&header[7])
         || ![2_u16, 3_u16].contains(&u16::from_le_bytes([header[16], header[17]]))
         || u16::from_le_bytes([header[18], header[19]]) != expected_machine
     {
         return Err(ReleaseError::InvalidBinary);
     }
     Ok(file)
 }
 
 #[cfg(not(unix))]
 fn open_binary(_path: &Path, _target: &str) -> Result<fs::File, ReleaseError> {
     Err(ReleaseError::InvalidBinary)
 }
 
 fn create_tree_archive(source: &Path, output: &Path, epoch: u32) -> Result<(), ReleaseError> {
     let file = create_new(output)?;
     let encoder = GzBuilder::new().mtime(epoch).write(
         BoundedWriter::new(file, MAX_SOURCE_ARCHIVE_BYTES),
         Compression::best(),
     );
     let mut tar = TarBuilder::new(encoder);
     tar.mode(tar::HeaderMode::Deterministic);
     let root_name = source.file_name().ok_or(ReleaseError::Generation)?;
     append_tree(&mut tar, source, Path::new(root_name), epoch)?;
     let encoder = tar.into_inner().map_err(|_| ReleaseError::Generation)?;
     encoder
         .finish()
         .map_err(|_| ReleaseError::Generation)?
         .sync_all()
         .map_err(|_| ReleaseError::Generation)
 }
 
 fn append_tree<W: std::io::Write>(
     tar: &mut TarBuilder<W>,
     source: &Path,
     archive_path: &Path,
     epoch: u32,
 ) -> Result<(), ReleaseError> {
     let mut entries = fs::read_dir(source)
         .map_err(|_| ReleaseError::Generation)?
         .collect::<Result<Vec<_>, _>>()
         .map_err(|_| ReleaseError::Generation)?;
     entries.sort_by_key(fs::DirEntry::file_name);
     for entry in entries {
         let file_type = entry.file_type().map_err(|_| ReleaseError::Generation)?;
         let path = entry.path();
         let member = archive_path.join(entry.file_name());
         if file_type.is_symlink() {
             return Err(ReleaseError::Generation);
         }
         if file_type.is_dir() {
             append_tree(tar, &path, &member, epoch)?;
             continue;
         }
         if !file_type.is_file() {
             return Err(ReleaseError::Generation);
         }
         let metadata = entry.metadata().map_err(|_| ReleaseError::Generation)?;
         let mut file = fs::File::open(path).map_err(|_| ReleaseError::Generation)?;
         let mut header = TarHeader::new_gnu();
         header.set_size(metadata.len());
         header.set_mode(0o644);
         header.set_uid(0);
         header.set_gid(0);
         header.set_mtime(u64::from(epoch));
         header.set_cksum();
         tar.append_data(&mut header, member, &mut file)
             .map_err(|_| ReleaseError::Generation)?;
     }
     Ok(())
 }
 
 fn supply_chain_documents(
     metadata: &CargoMetadata,
 ) -> Result<(CycloneDxBom, String), ReleaseError> {
     validate_metadata(metadata)?;
     let workspace = metadata
         .workspace_members
         .iter()
         .cloned()
         .collect::<BTreeSet<_>>();
     let mut packages = metadata.packages.clone();
     packages.sort_by(|left, right| left.id.cmp(&right.id));
     let mut components = Vec::with_capacity(packages.len());
     let mut notices = String::from(
         "THIRD-PARTY NOTICES\n\nGenerated from the exact locked Cargo graph. License expressions are package metadata; packaged vendored source is authoritative for license texts.\n\n",
     );
     for package in packages {
         let mut properties = vec![SbomProperty {
             name: "radroots:cargo_package_id",
             value: package.id.clone(),
         }];
         if let Some(source) = package.source {
             properties.push(SbomProperty {
                 name: "radroots:cargo_source",
                 value: source,
             });
         }
         if let Some(checksum) = package.checksum {
             properties.push(SbomProperty {
                 name: "radroots:cargo_checksum",
                 value: checksum,
             });
         }
         properties.push(SbomProperty {
             name: "radroots:workspace_member",
             value: workspace.contains(&package.id).to_string(),
         });
         let licenses = package.license.as_ref().map(|license| {
             vec![SbomLicenseChoice {
                 expression: license.clone(),
             }]
         });
         use fmt::Write as _;
         writeln!(
             notices,
             "{} {} — {}",
             package.name,
             package.version,
             package.license.as_deref().unwrap_or("NOASSERTION")
         )
         .map_err(|_| ReleaseError::Generation)?;
         components.push(SbomComponent {
             component_type: "library",
             bom_ref: package.id,
             name: package.name,
             version: package.version,
             licenses,
             properties,
         });
     }
     let mut dependencies = metadata
         .resolve
         .as_ref()
         .ok_or(ReleaseError::InvalidMetadata)?
         .nodes
         .iter()
         .map(|node| {
             let mut depends_on = node.dependencies.clone();
             depends_on.sort();
             depends_on.dedup();
             SbomDependency {
                 reference: node.id.clone(),
                 depends_on,
             }
         })
         .collect::<Vec<_>>();
     dependencies.sort_by(|left, right| left.reference.cmp(&right.reference));
     Ok((
         CycloneDxBom {
             bom_format: "CycloneDX",
             spec_version: "1.5",
             version: 1,
             metadata: SbomMetadata {
                 component: SbomRootComponent {
                     component_type: "application",
                     name: SERVICE,
                     version: VERSION,
                 },
             },
             components,
             dependencies,
         },
         notices,
     ))
 }
 
 #[cfg(test)]
 fn validate_relative(value: &str) -> Result<(), ReleaseError> {
     let path = Path::new(value);
     if value.is_empty()
         || path.is_absolute()
         || path.components().any(|component| {
             matches!(
                 component,
                 std::path::Component::ParentDir
                     | std::path::Component::RootDir
                     | std::path::Component::Prefix(_)
             )
         })
     {
         return Err(ReleaseError::InvalidSource);
     }
     Ok(())
 }
 
 fn copy_bounded(source: &Path, output: &Path, maximum: u64) -> Result<(), ReleaseError> {
     validate_regular(source, maximum, ReleaseError::InvalidSource)?;
     let metadata = fs::metadata(source).map_err(|_| ReleaseError::InvalidSource)?;
     let mut input = fs::File::open(source).map_err(|_| ReleaseError::InvalidSource)?;
     let mut target = create_new(output)?;
     let mut scanner = SecretScanner::default();
     let mut total = 0_u64;
     let mut buffer = [0_u8; COPY_BUFFER_BYTES];
     loop {
         let read = input
             .read(&mut buffer)
             .map_err(|_| ReleaseError::InvalidSource)?;
         if read == 0 {
             break;
         }
         total = total
             .checked_add(u64::try_from(read).map_err(|_| ReleaseError::InvalidSource)?)
             .ok_or(ReleaseError::InvalidSource)?;
         if total > maximum {
             return Err(ReleaseError::InvalidSource);
         }
         scanner.scan(&buffer[..read])?;
         target
             .write_all(&buffer[..read])
             .map_err(|_| ReleaseError::Generation)?;
     }
     if total != metadata.len() {
         return Err(ReleaseError::InvalidSource);
     }
     target.sync_all().map_err(|_| ReleaseError::Generation)
 }
 
 fn create_new(path: &Path) -> Result<fs::File, ReleaseError> {
     let mut options = fs::OpenOptions::new();
     options.create_new(true).write(true);
     #[cfg(unix)]
     {
         use std::os::unix::fs::OpenOptionsExt as _;
         options.mode(0o644);
     }
     let file = options.open(path).map_err(|_| ReleaseError::Generation)?;
     set_file_permissions(&file)?;
     Ok(file)
 }
 
 #[cfg(unix)]
 fn set_file_permissions(file: &fs::File) -> Result<(), ReleaseError> {
     use std::os::unix::fs::PermissionsExt as _;
 
     file.set_permissions(fs::Permissions::from_mode(0o644))
         .map_err(|_| ReleaseError::Generation)
 }
 
 #[cfg(not(unix))]
 fn set_file_permissions(_file: &fs::File) -> Result<(), ReleaseError> {
     Ok(())
 }
 
 #[cfg(unix)]
 fn set_directory_permissions(path: &Path) -> Result<(), ReleaseError> {
     use std::os::unix::fs::PermissionsExt as _;
 
     fs::set_permissions(path, fs::Permissions::from_mode(0o755))
         .map_err(|_| ReleaseError::Generation)
 }
 
 #[cfg(not(unix))]
 fn set_directory_permissions(_path: &Path) -> Result<(), ReleaseError> {
     Ok(())
 }
 
 #[cfg(unix)]
 fn sync_directory(path: &Path) -> Result<(), ReleaseError> {
     fs::File::open(path)
         .and_then(|directory| directory.sync_all())
         .map_err(|_| ReleaseError::Generation)
 }
 
 #[cfg(not(unix))]
 fn sync_directory(_path: &Path) -> Result<(), ReleaseError> {
     Ok(())
 }
 
 #[cfg(unix)]
 fn publish_directory(source: &Path, destination: &Path) -> Result<(), ReleaseError> {
     use rustix::fs::{CWD, RenameFlags, renameat_with};
 
     renameat_with(CWD, source, CWD, destination, RenameFlags::NOREPLACE)
         .map_err(|_| ReleaseError::Generation)
 }
 
 #[cfg(not(unix))]
 fn publish_directory(_source: &Path, _destination: &Path) -> Result<(), ReleaseError> {
     Err(ReleaseError::Generation)
 }
 
 struct BoundedWriter<W> {
     inner: W,
     written: u64,
     maximum: u64,
 }
 
 impl<W> BoundedWriter<W> {
     const fn new(inner: W, maximum: u64) -> Self {
         Self {
             inner,
             written: 0,
             maximum,
         }
     }
 }
 
 impl BoundedWriter<fs::File> {
     fn sync_all(&self) -> std::io::Result<()> {
         self.inner.sync_all()
     }
 }
 
 impl<W: std::io::Write> std::io::Write for BoundedWriter<W> {
     fn write(&mut self, bytes: &[u8]) -> std::io::Result<usize> {
         let remaining = self.maximum.saturating_sub(self.written);
         if remaining == 0 && !bytes.is_empty() {
             return Err(std::io::Error::other("bounded output exceeded"));
         }
         let admitted = bytes
             .len()
             .min(usize::try_from(remaining).unwrap_or(usize::MAX));
         let written = self.inner.write(&bytes[..admitted])?;
         self.written = self
             .written
             .checked_add(u64::try_from(written).map_err(std::io::Error::other)?)
             .ok_or_else(|| std::io::Error::other("bounded output exceeded"))?;
         Ok(written)
     }
 
     fn flush(&mut self) -> std::io::Result<()> {
         self.inner.flush()
     }
 }
 
 fn write_json<T: Serialize>(path: &Path, value: &T) -> Result<(), ReleaseError> {
     let mut bytes = serde_json::to_vec(value).map_err(|_| ReleaseError::Generation)?;
     bytes.push(b'\n');
     write_generated(path, &bytes)
 }
 
 fn write_generated(path: &Path, bytes: &[u8]) -> Result<(), ReleaseError> {
     if bytes.is_empty() || bytes.len() as u64 > MAX_DOCUMENT_BYTES {
         return Err(ReleaseError::Generation);
     }
     scan_bytes(bytes)?;
     let mut file = create_new(path)?;
     file.write_all(bytes)
         .and_then(|()| file.sync_all())
         .map_err(|_| ReleaseError::Generation)
 }
 
 fn write_checksums(root: &Path) -> Result<(), ReleaseError> {
     let records = inventory_records(root)?;
     let mut output = String::new();
     use fmt::Write as _;
     for record in records {
         writeln!(output, "{}  {}", record.sha256, record.path)
             .map_err(|_| ReleaseError::Generation)?;
     }
     write_generated(&root.join("SHA256SUMS"), output.as_bytes())
 }
 
 fn inventory_records(root: &Path) -> Result<Vec<ArtifactRecord>, ReleaseError> {
     let mut names = fs::read_dir(root)
         .map_err(|_| ReleaseError::InvalidOutput)?
         .collect::<Result<Vec<_>, _>>()
         .map_err(|_| ReleaseError::InvalidOutput)?;
     names.sort_by_key(fs::DirEntry::file_name);
     names
         .into_iter()
         .map(|entry| {
             let name = entry
                 .file_name()
                 .into_string()
                 .map_err(|_| ReleaseError::InvalidOutput)?;
             let evidence = hash_regular(&entry.path(), output_maximum(&name)?)?;
             Ok(ArtifactRecord {
                 path: name,
                 byte_length: evidence.byte_length,
                 sha256: evidence.sha256,
             })
         })
         .collect()
 }
 
 fn output_maximum(name: &str) -> Result<u64, ReleaseError> {
     match name {
         "binary.tar.gz" => Ok(MAX_BINARY_BYTES + MAX_TEXT_BYTES),
         "service-source.tar.gz" => Ok(MAX_SOURCE_ARCHIVE_BYTES),
         "LICENSE"
         | "config.example.toml"
         | "config.schema.json"
         | "systemd.service"
         | SOURCE_LOCK => Ok(MAX_TEXT_BYTES),
         "SHA256SUMS"
         | "THIRD-PARTY-NOTICES.txt"
         | "artifact-manifest.v1.json"
         | "provenance-input.v1.json"
         | "sbom.cdx.json" => Ok(MAX_DOCUMENT_BYTES),
         _ => Err(ReleaseError::InvalidOutput),
     }
 }
 
 fn validate_exact_inventory(root: &Path) -> Result<(), ReleaseError> {
     let actual = inventory_records(root)?;
     if actual
         .iter()
         .map(|record| record.path.as_str())
         .collect::<Vec<_>>()
         != OUTPUT_NAMES
     {
         return Err(ReleaseError::InvalidOutput);
     }
     validate_output_permissions(root)?;
     Ok(())
 }
 
 #[cfg(unix)]
 fn validate_output_permissions(root: &Path) -> Result<(), ReleaseError> {
     use std::os::unix::fs::PermissionsExt as _;
 
     let root_metadata = fs::symlink_metadata(root).map_err(|_| ReleaseError::InvalidOutput)?;
     if root_metadata.file_type().is_symlink()
         || !root_metadata.is_dir()
         || root_metadata.permissions().mode() & 0o777 != 0o755
     {
         return Err(ReleaseError::InvalidOutput);
     }
     for name in OUTPUT_NAMES {
         let metadata =
             fs::symlink_metadata(root.join(name)).map_err(|_| ReleaseError::InvalidOutput)?;
         if metadata.file_type().is_symlink()
             || !metadata.is_file()
             || metadata.permissions().mode() & 0o777 != 0o644
         {
             return Err(ReleaseError::InvalidOutput);
         }
     }
     Ok(())
 }
 
 #[cfg(not(unix))]
 fn validate_output_permissions(_root: &Path) -> Result<(), ReleaseError> {
     Ok(())
 }
 
 fn compare_output(output: &Path, expected: &[ArtifactRecord]) -> Result<(), ReleaseError> {
     validate_exact_inventory(output)?;
     let actual = inventory_records(output)?;
     if actual != expected {
         return Err(ReleaseError::StaleOutput);
     }
     Ok(())
 }
 
 struct FileEvidence {
     byte_length: u64,
     sha256: String,
 }
 
 fn hash_regular(path: &Path, maximum: u64) -> Result<FileEvidence, ReleaseError> {
     validate_regular(path, maximum, ReleaseError::InvalidOutput)?;
     let metadata = fs::metadata(path).map_err(|_| ReleaseError::InvalidOutput)?;
     let mut file = fs::File::open(path).map_err(|_| ReleaseError::InvalidOutput)?;
     let mut hasher = Sha256::new();
     let mut total = 0_u64;
     let mut buffer = [0_u8; COPY_BUFFER_BYTES];
     loop {
         let read = file
             .read(&mut buffer)
             .map_err(|_| ReleaseError::InvalidOutput)?;
         if read == 0 {
             break;
         }
         total = total
             .checked_add(u64::try_from(read).map_err(|_| ReleaseError::InvalidOutput)?)
             .ok_or(ReleaseError::InvalidOutput)?;
         if total > maximum {
             return Err(ReleaseError::InvalidOutput);
         }
         hasher.update(&buffer[..read]);
     }
     if total != metadata.len() {
         return Err(ReleaseError::InvalidOutput);
     }
     Ok(FileEvidence {
         byte_length: total,
         sha256: hex::encode(hasher.finalize()),
     })
 }
 
 fn validate_regular(path: &Path, maximum: u64, error: ReleaseError) -> Result<(), ReleaseError> {
     let metadata = fs::symlink_metadata(path).map_err(|_| error)?;
     if metadata.file_type().is_symlink() || !metadata.is_file() || metadata.len() > maximum {
         return Err(error);
     }
     Ok(())
 }
 
 fn read_bounded(path: &Path, maximum: u64, error: ReleaseError) -> Result<Vec<u8>, ReleaseError> {
     validate_regular(path, maximum, error)?;
     let mut bytes = Vec::new();
     fs::File::open(path)
         .map_err(|_| error)?
         .take(maximum.saturating_add(1))
         .read_to_end(&mut bytes)
         .map_err(|_| error)?;
     if bytes.len() as u64 > maximum {
         return Err(error);
     }
     Ok(bytes)
 }
 
 fn command_capture_bounded(
     command: &mut Command,
     maximum: u64,
     error: ReleaseError,
 ) -> Result<Vec<u8>, ReleaseError> {
     let file = NamedTempFile::new().map_err(|_| error)?;
     let stdout = file.reopen().map_err(|_| error)?;
     let status = command
         .stdin(Stdio::null())
         .stdout(Stdio::from(stdout))
         .stderr(Stdio::null())
         .status()
         .map_err(|_| error)?;
     if !status.success() {
         return Err(error);
     }
     read_bounded(file.path(), maximum, error)
 }
 
 fn git_capture(root: &Path, arguments: &[&str], maximum: usize) -> Result<Vec<u8>, ReleaseError> {
     command_capture_bounded(
         Command::new("git").args(arguments).current_dir(root),
         maximum as u64,
         ReleaseError::InvalidSource,
     )
 }
 
 fn exact_line(bytes: &[u8]) -> Option<&str> {
     let value = std::str::from_utf8(bytes).ok()?.strip_suffix('\n')?;
     (!value.is_empty() && !value.contains(['\n', '\r'])).then_some(value)
 }
 
 fn lower_hex(value: &str, length: usize) -> bool {
     value.len() == length
         && value
             .bytes()
             .all(|byte| byte.is_ascii_digit() || (b'a'..=b'f').contains(&byte))
 }
 
 #[derive(Default)]
 struct SecretScanner {
     tail: Vec<u8>,
 }
 
 impl SecretScanner {
     fn scan(&mut self, bytes: &[u8]) -> Result<(), ReleaseError> {
         let mut combined = Vec::with_capacity(self.tail.len() + bytes.len());
         combined.extend_from_slice(&self.tail);
         combined.extend_from_slice(bytes);
         if SECRET_PATTERNS
             .iter()
             .any(|pattern| contains_bytes(&combined, pattern))
         {
             return Err(ReleaseError::ProtectedMaterial);
         }
         let retained = SECRET_PATTERNS
             .iter()
             .map(|pattern| pattern.len().saturating_sub(1))
             .max()
             .unwrap_or(0)
             .min(combined.len());
         self.tail.clear();
         self.tail
             .extend_from_slice(&combined[combined.len() - retained..]);
         Ok(())
     }
 }
 
 fn scan_bytes(bytes: &[u8]) -> Result<(), ReleaseError> {
     let mut scanner = SecretScanner::default();
     scanner.scan(bytes)
 }
 
 fn contains_bytes(haystack: &[u8], needle: &[u8]) -> bool {
     !needle.is_empty()
         && haystack
             .windows(needle.len())
             .any(|window| window == needle)
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn argument_parser_is_closed_and_bounded() {
         let args = parse_native_release_args(vec![
             "--mode".into(),
             "check".into(),
             "--target".into(),
             "x86_64-unknown-linux-gnu".into(),
             "--binary".into(),
             "/tmp/myc".into(),
             "--output".into(),
             "/tmp/release".into(),
             "--source-date-epoch".into(),
             "1".into(),
         ])
         .expect("valid arguments");
         assert_eq!(args.mode, Mode::Check);
         assert_eq!(args.source_date_epoch, 1);
         for mutation in [
             vec!["--mode".into(), "write".into()],
             vec![
                 "--mode".into(),
                 "write".into(),
                 "--mode".into(),
                 "check".into(),
                 "--target".into(),
                 "x86_64-unknown-linux-gnu".into(),
                 "--binary".into(),
                 "/tmp/myc".into(),
                 "--output".into(),
                 "/tmp/release".into(),
                 "--source-date-epoch".into(),
                 "1".into(),
             ],
             vec![
                 "--mode".into(),
                 "write".into(),
                 "--target".into(),
                 "x86_64-apple-darwin".into(),
                 "--binary".into(),
                 "/tmp/myc".into(),
                 "--output".into(),
                 "/tmp/release".into(),
                 "--source-date-epoch".into(),
                 "1".into(),
             ],
         ] {
             assert_eq!(
                 parse_native_release_args(mutation).expect_err("invalid arguments"),
                 ReleaseError::InvalidArguments
             );
         }
     }
 
     #[test]
     fn secret_scanner_detects_split_patterns() {
         let mut scanner = SecretScanner::default();
         scanner.scan(b"prefix github_").expect("prefix");
         assert_eq!(
             scanner.scan(b"pat_value").expect_err("secret rejected"),
             ReleaseError::ProtectedMaterial
         );
     }
 
     #[cfg(unix)]
     #[test]
     fn binary_archive_is_deterministic_and_contains_one_member() {
         use std::os::unix::fs::PermissionsExt as _;
 
         let directory = TempDir::new().expect("tempdir");
         let binary = directory.path().join("myc");
         let mut elf = [0_u8; 20];
         elf[..8].copy_from_slice(&[0x7f, b'E', b'L', b'F', 2, 1, 1, 0]);
         elf[16..18].copy_from_slice(&3_u16.to_le_bytes());
         elf[18..20].copy_from_slice(&62_u16.to_le_bytes());
         fs::write(&binary, elf).expect("binary");
         fs::set_permissions(&binary, fs::Permissions::from_mode(0o755)).expect("binary mode");
         let first = directory.path().join("first.tar.gz");
         let second = directory.path().join("second.tar.gz");
         create_binary_archive(&binary, &first, "x86_64-unknown-linux-gnu", 1)
             .expect("first archive");
         create_binary_archive(&binary, &second, "x86_64-unknown-linux-gnu", 1)
             .expect("second archive");
         assert_eq!(
             fs::read(first).expect("first"),
             fs::read(second).expect("second")
         );
         assert_eq!(
             create_binary_archive(
                 &binary,
                 &directory.path().join("wrong-target.tar.gz"),
                 "aarch64-unknown-linux-gnu",
                 1,
             )
             .expect_err("target mismatch"),
             ReleaseError::InvalidBinary
         );
     }
 
     #[cfg(unix)]
     #[test]
     fn generated_permissions_are_exact() {
         use std::os::unix::fs::PermissionsExt as _;
 
         let parent = TempDir::new().expect("tempdir");
         let directory = parent.path().join("release");
         fs::create_dir(&directory).expect("directory");
         set_directory_permissions(&directory).expect("directory mode");
         let file = directory.join("artifact");
         create_new(&file).expect("artifact");
         assert_eq!(
             fs::metadata(directory)
                 .expect("directory metadata")
                 .permissions()
                 .mode()
                 & 0o777,
             0o755
         );
         assert_eq!(
             fs::metadata(file)
                 .expect("file metadata")
                 .permissions()
                 .mode()
                 & 0o777,
             0o644
         );
     }
 
     #[test]
     fn compressed_outputs_are_bounded_before_allocation() {
         let mut writer = BoundedWriter::new(Vec::new(), 3);
         assert!(writer.write_all(b"abc").is_ok());
         assert_eq!(writer.written, 3);
         assert!(writer.write_all(b"d").is_err());
     }
 
     #[test]
     fn sbom_uses_spdx_expressions_in_the_governed_field() {
         assert_eq!(
             serde_json::to_value(SbomLicenseChoice {
                 expression: "MIT OR Apache-2.0".to_owned(),
             })
             .expect("license choice"),
             serde_json::json!({"expression": "MIT OR Apache-2.0"})
         );
     }
 
     #[test]
     fn relative_paths_reject_escape_and_absolute_values() {
         for rejected in ["", "../escape", "a/../../escape", "/absolute"] {
             assert_eq!(
                 validate_relative(rejected).expect_err("path rejected"),
                 ReleaseError::InvalidSource
             );
         }
         validate_relative("contracts/config.json").expect("safe path");
     }
 
     #[test]
     fn error_surface_is_fixed_and_source_free() {
         for error in [
             ReleaseError::InvalidArguments,
             ReleaseError::InvalidSource,
             ReleaseError::DirtySource,
             ReleaseError::InvalidBinary,
             ReleaseError::InvalidOutput,
             ReleaseError::InvalidMetadata,
             ReleaseError::InvalidSourceLock,
             ReleaseError::ProtectedMaterial,
             ReleaseError::StaleOutput,
             ReleaseError::Generation,
         ] {
             assert!(!error.code().is_empty());
             let display = error.to_string();
             assert!(!display.contains('/'));
             assert!(!display.contains("github_pat"));
             assert!(std::error::Error::source(&error).is_none());
         }
     }
 }