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//! Build-time provenance for native smoke artifacts.
use std::env;
use std::path::{Path, PathBuf};
use std::process::Command;
fn main() {
println!("cargo:rerun-if-env-changed=TARGET");
println!("cargo:rerun-if-env-changed=GITHUB_SHA");
println!("cargo:rerun-if-env-changed=SOURCE_VERSION");
println!("cargo:rerun-if-env-changed=BUILD_VCS_NUMBER");
if let Ok(target) = env::var("TARGET") {
println!("cargo:rustc-env=FPARKAN_BUILD_TARGET_TRIPLE={target}");
}
let workspace_root =
PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("manifest dir")).join("../..");
if let Some(git_dir) = git_dir(&workspace_root) {
emit_git_rerun_hints(&git_dir);
}
if let Some(commit_sha) = env_commit_sha().or_else(|| git_head_commit_sha(&workspace_root)) {
println!("cargo:rustc-env=FPARKAN_BUILD_COMMIT_SHA={commit_sha}");
}
}
fn env_commit_sha() -> Option<String> {
["GITHUB_SHA", "SOURCE_VERSION", "BUILD_VCS_NUMBER"]
.into_iter()
.filter_map(|name| env::var(name).ok())
.find(|value| is_commit_sha(value))
}
fn git_head_commit_sha(workspace_root: &Path) -> Option<String> {
let output = Command::new("git")
.args(["-C"])
.arg(workspace_root)
.args(["rev-parse", "HEAD"])
.output()
.ok()?;
if !output.status.success() {
return None;
}
let value = String::from_utf8(output.stdout).ok()?;
let value = value.trim().to_string();
is_commit_sha(&value).then_some(value)
}
fn git_dir(workspace_root: &Path) -> Option<PathBuf> {
let output = Command::new("git")
.args(["-C"])
.arg(workspace_root)
.args(["rev-parse", "--git-dir"])
.output()
.ok()?;
if !output.status.success() {
return None;
}
let value = String::from_utf8(output.stdout).ok()?;
let value = value.trim();
(!value.is_empty()).then(|| workspace_root.join(value))
}
fn emit_git_rerun_hints(git_dir: &Path) {
let head = git_dir.join("HEAD");
println!("cargo:rerun-if-changed={}", head.display());
println!(
"cargo:rerun-if-changed={}",
git_dir.join("packed-refs").display()
);
let Some(reference) = std::fs::read_to_string(&head).ok().and_then(|value| {
value
.strip_prefix("ref: ")
.map(str::trim)
.map(ToOwned::to_owned)
}) else {
return;
};
println!(
"cargo:rerun-if-changed={}",
git_dir.join(reference).display()
);
}
fn is_commit_sha(value: &str) -> bool {
value.len() == 40 && value.chars().all(|ch| ch.is_ascii_hexdigit())
}
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