use super::build_script::execute_build_script;
use super::build_script_directives::BuildScriptDirectives;
use super::dag_cache::ExecutionContext;
use super::types::PlannedCompilationUnit;
use anyhow::{bail, Result};
use std::collections::HashMap;
use std::fs;
use std::path::{Path, PathBuf};
pub(crate) fn create_staging_dir(cas_root: &Path, clean_crate: &str) -> Result<PathBuf> {
static STAGE_COUNTER: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(1);
let tmp_root = cas_root.join("tmp");
fs::create_dir_all(&tmp_root)?;
let mut rng = super::dag_scheduler::FastPrng::from_env();
for _ in 0..64 {
let seq = STAGE_COUNTER.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
let nonce = rng.next_u64() ^ seq;
let s = tmp_root.join(format!(
"stage_{clean_crate}_{}_{:016x}",
std::process::id(),
nonce
));
match fs::create_dir(&s) {
Ok(()) => return Ok(s),
Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => continue,
Err(e) => return Err(e.into()),
}
}
bail!(
"Failed to create unique staging directory in {:?}",
tmp_root
)
}
pub(crate) fn run_build_script_if_needed(
unit: &PlannedCompilationUnit,
clean_crate: &str,
ctx: &ExecutionContext,
) -> Result<(Option<BuildScriptDirectives>, Option<PathBuf>)> {
if !super::unit_env::unit_has_build_script(unit) {
return Ok((None, None));
}
let staging_dir = create_staging_dir(ctx.cas.root(), clean_crate)?;
let extern_crates = super::dag_unit_externs::resolve_extern_crates_for_build_script(
unit,
&ctx.completed_artifacts.lock().unwrap(),
);
let artifacts_dir = ctx.cas.root().join("artifacts");
let mut build_dep_env = HashMap::new();
{
let all_meta = ctx.dep_build_metadata.lock().unwrap();
for dep_id in &unit.dependencies {
let clean_dep_id = dep_id.strip_suffix(":host").unwrap_or(dep_id);
let dep_pkg = clean_dep_id.split("::").next().unwrap_or(clean_dep_id);
let pkg_name_only = dep_pkg.split('@').next().unwrap_or(dep_pkg);
for key in [dep_id.as_str(), clean_dep_id, pkg_name_only] {
if let Some(vars) = all_meta.get(key) {
build_dep_env.extend(vars.clone());
}
}
}
}
let directives = match execute_build_script(
unit,
&staging_dir,
ctx.opt.release,
&unit.features,
Some(&artifacts_dir),
&extern_crates,
Some(&build_dep_env),
) {
Ok(d) => d,
Err(err) => {
let _ = fs::remove_dir_all(&staging_dir);
let pkg_dir = unit
.manifest_path
.parent()
.unwrap_or(std::path::Path::new("."));
bail!(
"rustc failed for unit '{}' (exit code 1):\n command: rustc build.rs\n cwd: {}\n{}",
unit.unit_id(),
pkg_dir.display(),
err
);
}
};
if ctx.opt.mode == super::types::BuildMode::Clippy && unit.is_primary {
let already_linted = ctx.resolved_keys.is_some_and(|rk| {
rk.lock()
.unwrap()
.insert(format!("__clippy_bs__:{}", unit.package_id), String::new())
.is_some()
});
if !already_linted {
if let Some(build_rs) = super::build_script::resolve_build_script_path(unit) {
let mut bs_unit = unit.clone();
bs_unit.kind = "custom-build".to_string();
bs_unit.target_name = "build_script_build".to_string();
bs_unit.src_path = build_rs;
bs_unit.for_host = true;
let bs_out = staging_dir.join("clippy_build_script");
let inv = super::compiler::RustcInvocation {
unit: &bs_unit,
action_key: "build_script_clippy",
out_dir: &bs_out,
dest_binary: None,
extern_crates: &extern_crates,
release: ctx.opt.release,
features: &unit.features,
directives: None,
mode: super::types::BuildMode::Clippy,
extra_compiler_args: &ctx.opt.extra_args,
jobserver_auth: ctx.jobserver.and_then(|j| j.auth()),
deps_dir: Some(&artifacts_dir),
target_dir: Some(ctx.target_dir),
cache_root: ctx.cas.root().parent(),
};
let out = inv.execute()?;
if !out.stderr.is_empty() {
let mut msgs = ctx.compiler_messages.lock().unwrap();
if !msgs.contains(&out.stderr) {
msgs.push(out.stderr.clone());
if let Some(ref cb) = ctx.opt.progress {
cb.0(super::types::BuildProgressEvent::CompilerMessage(
out.stderr.clone(),
));
}
}
}
if !out.success {
let _ = fs::remove_dir_all(&staging_dir);
bail!(
"clippy failed for build.rs of unit '{}' (exit code {}):\n{}",
unit.unit_id(),
out.exit_code,
out.stderr
);
}
}
}
}
let dep_vars = directives.dep_env_vars();
if !dep_vars.is_empty() {
let mut all_meta = ctx.dep_build_metadata.lock().unwrap();
all_meta.insert(unit.unit_id(), dep_vars.clone());
all_meta.insert(unit.package_name.clone(), dep_vars);
}
let pkg_dir = unit.manifest_path.parent().unwrap_or(Path::new("."));
if let Some(env_map) = ctx.tracked_env_vars {
let mut guard = env_map.lock().unwrap();
for var in &directives.rerun_if_env_changed {
guard.insert(var.clone(), std::env::var(var).ok());
}
}
if let Some(files_map) = ctx.tracked_extra_files {
let mut guard = files_map.lock().unwrap();
for (file_rel, expected_hash) in &directives.rerun_if_changed_hashes {
let fpath = if Path::new(file_rel).is_absolute() {
PathBuf::from(file_rel)
} else {
pkg_dir.join(file_rel)
};
guard.insert(fpath, expected_hash.clone());
}
}
Ok((Some(directives), Some(staging_dir)))
}
pub fn record_completed_directives(
unit_id: &str,
directives: &BuildScriptDirectives,
cfgs_map: Option<&super::dag_cache::CompletedCfgsMap>,
env_map: Option<&super::dag_cache::CompletedEnvMap>,
link_map: Option<&super::dag_cache::CompletedLinkArgsMap>,
) {
if let Some(cfgs) = cfgs_map {
if !directives.cfgs.is_empty() {
cfgs.lock()
.unwrap()
.insert(unit_id.to_string(), directives.cfgs.clone());
}
}
if let Some(envs) = env_map {
let mut u_env = directives.envs.clone();
if let Some(ref out) = directives.out_dir {
u_env.insert("OUT_DIR".to_string(), out.to_string_lossy().to_string());
}
if !u_env.is_empty() {
envs.lock().unwrap().insert(unit_id.to_string(), u_env);
}
}
if let Some(links) = link_map {
let mut args = Vec::new();
for s in &directives.link_searches {
args.push("-L".to_string());
args.push(s.clone());
}
for l in &directives.link_libs {
args.push("-l".to_string());
args.push(l.clone());
}
for a in &directives.link_args {
args.push("-C".to_string());
args.push(format!("link-arg={}", a));
}
if !args.is_empty() {
links.lock().unwrap().insert(unit_id.to_string(), args);
}
}
}
pub(crate) struct PreCompileKeyInfo {
pub effective_action_key: String,
pub ws_fallback_key: Option<String>,
pub build_purity_opt: Option<super::build_script_purity::BuildScriptPurity>,
}
pub(crate) fn prepare_unit_build_script_keys(
unit: &PlannedCompilationUnit,
action_key: &str,
ctx: &ExecutionContext,
current_directives: Option<&BuildScriptDirectives>,
staging_dir_holder: Option<&PathBuf>,
) -> PreCompileKeyInfo {
let mut build_purity_opt = None;
let ws_root = match unit.is_workspace {
true => super::compiler::find_workspace_root(&unit.manifest_path),
false => ctx
.target_dir
.parent()
.unwrap_or(ctx.target_dir)
.to_path_buf(),
};
if let (Some(d), Some(s_dir)) = (current_directives, staging_dir_holder) {
let pkg_dir = unit.manifest_path.parent().unwrap_or(Path::new("."));
let out_dir_to_scan = d.out_dir.as_deref().unwrap_or(s_dir);
let empty_refs = std::collections::HashSet::new();
if let Ok(purity) = super::build_script_purity::assess_build_script_purity_with_dep_info(
pkg_dir,
Some(&ws_root),
out_dir_to_scan,
Some(ctx.target_dir),
Some(ctx.cas.root()),
d,
Some(&empty_refs),
) {
build_purity_opt = Some(purity);
}
}
if let Some(d) = current_directives {
let bd = d.compute_compile_hash();
let ws_hash = crate::core::hash::Sha256::digest(ws_root.to_string_lossy().as_bytes());
let ws_key = format!("{action_key}:bd:{bd}:ws:{ws_hash}");
if let Some(ref purity) = build_purity_opt {
if purity.is_pure {
PreCompileKeyInfo {
effective_action_key: format!(
"{action_key}:bd:{bd}:out:{}",
purity.out_dir_hash
),
ws_fallback_key: Some(ws_key),
build_purity_opt,
}
} else {
let reason = purity.reason.as_deref().unwrap_or("unknown");
eprintln!(
"[mitts::purity] Unit '{}' marked impure: {reason}",
unit.unit_id()
);
PreCompileKeyInfo {
effective_action_key: ws_key,
ws_fallback_key: None,
build_purity_opt,
}
}
} else {
PreCompileKeyInfo {
effective_action_key: format!("{action_key}:bd:{bd}"),
ws_fallback_key: None,
build_purity_opt,
}
}
} else {
PreCompileKeyInfo {
effective_action_key: action_key.to_string(),
ws_fallback_key: None,
build_purity_opt,
}
}
}
pub(crate) fn finalize_post_rustc_purity(
unit: &PlannedCompilationUnit,
clean_crate: &str,
ctx: &ExecutionContext,
current_directives: Option<&BuildScriptDirectives>,
staging_dir: &Path,
pre_info: &PreCompileKeyInfo,
) -> (
String,
Option<super::build_script_purity::BuildScriptPurity>,
) {
if let (Some(d), Some(pre_purity)) = (current_directives, pre_info.build_purity_opt.as_ref()) {
if pre_purity.is_pure {
let pkg_dir = unit.manifest_path.parent().unwrap_or(Path::new("."));
let ws_root = match unit.is_workspace {
true => super::compiler::find_workspace_root(&unit.manifest_path),
false => ctx
.target_dir
.parent()
.unwrap_or(ctx.target_dir)
.to_path_buf(),
};
let out_dir_to_scan = d.out_dir.as_deref().unwrap_or(staging_dir);
let ref_files = super::build_script_purity::extract_out_dir_files_from_dep_info(
staging_dir,
out_dir_to_scan,
clean_crate,
Some(&ws_root),
);
if let Ok(post_purity) =
super::build_script_purity::assess_build_script_purity_with_dep_info(
pkg_dir,
Some(&ws_root),
out_dir_to_scan,
Some(ctx.target_dir),
Some(ctx.cas.root()),
d,
ref_files.as_ref(),
)
{
if !post_purity.is_pure {
let reason = post_purity.reason.as_deref().unwrap_or("unknown");
eprintln!(
"[mitts::purity] Unit '{}' marked impure: {reason}",
unit.unit_id()
);
let fb_key = pre_info
.ws_fallback_key
.clone()
.unwrap_or_else(|| pre_info.effective_action_key.clone());
if let Ok(toml_str) = toml::to_string(d) {
let meta_dir = ctx.cas.root().join("metadata");
let safe_meta_key = crate::core::action_cache::safe_key_file_name(&fb_key);
let _ = fs::write(meta_dir.join(format!("{safe_meta_key}.toml")), toml_str);
}
return (fb_key, Some(post_purity));
}
return (pre_info.effective_action_key.clone(), Some(post_purity));
}
}
}
(
pre_info.effective_action_key.clone(),
pre_info.build_purity_opt.clone(),
)
}