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//! ref: composer/src/Composer/Compiler.php
//!
//! Generates the constant values of `composer::SHIRABE_RELEASE_DATE` and
//! `composer::COMPOSER_DEV_WARNING_TIME` from the HEAD commit.
fn git(repo_root: &std::path::Path, args: &[&str]) -> Option<String> {
let output = std::process::Command::new("git")
.args(args)
.current_dir(repo_root)
.env("TZ", "UTC")
.output()
.ok()?;
if !output.status.success() {
return None;
}
Some(String::from_utf8(output.stdout).ok()?.trim().to_string())
}
fn main() {
println!("cargo::rerun-if-changed=build.rs");
let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
let repo_root = std::path::Path::new(&manifest_dir)
.parent()
.unwrap()
.parent()
.unwrap();
if let Some(git_dir) = git(repo_root, &["rev-parse", "--git-dir"]) {
let git_dir = repo_root.join(git_dir);
// Committing on the current branch moves the branch ref, not HEAD.
let branch_ref = git(repo_root, &["symbolic-ref", "-q", "HEAD"]);
for path in ["HEAD", "packed-refs", "refs/tags"]
.iter()
.map(|name| git_dir.join(name))
.chain(branch_ref.map(|name| git_dir.join(name)))
{
if path.exists() {
println!("cargo::rerun-if-changed={}", path.display());
}
}
}
// Both constants describe the HEAD commit, so a checkout git cannot read leaves the build
// unable to date itself. Falling back would ship a build that claims a release date it does
// not have and that never reports itself as outdated.
let expect_git = "the release date comes from the HEAD commit: build from a git checkout";
let release_date = git(
repo_root,
&[
"log",
"-n1",
"--date=format-local:%Y-%m-%d %H:%M:%S",
"--pretty=%cd",
"HEAD",
],
)
.expect(expect_git);
let commit_time = git(repo_root, &["log", "-n1", "--pretty=%ct", "HEAD"])
.and_then(|date| date.parse::<i64>().ok())
.expect(expect_git);
let dev_warning_time =
if git(repo_root, &["describe", "--tags", "--exact-match", "HEAD"]).is_some() {
None
} else {
Some(commit_time + 60 * 86400)
};
let out_dir = std::path::PathBuf::from(std::env::var("OUT_DIR").unwrap());
std::fs::write(out_dir.join("release_date.rs"), format!("{release_date:?}")).unwrap();
std::fs::write(
out_dir.join("dev_warning_time.rs"),
match dev_warning_time {
Some(time) => format!("Some({time})"),
None => "None".to_string(),
},
)
.unwrap();
}
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