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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
// Writes build information to ${OUT_DIR}/build-info.rs which is included in
// the program during compilation:
//
// ```no_run
// const COMMIT_HASH: Option<&'static str> = Some("c31a366");
// const COMMIT_DATE: Option<&'static str> = Some("1988-05-10");
// ```
//
// The values are `None` if running hg failed, e.g. if it is not installed or
// if we are not in an hg repo.
use std::env;
use std::ffi::OsStr;
use std::fs::File;
use std::io;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::process::Command;
fn main() -> io::Result<()> {
let cur_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
let build_info = get_build_info(&cur_dir);
let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
let mut fh = File::create(out_dir.join("build-info.rs"))?;
writeln!(
fh,
"const COMMIT_HASH: Option<&'static str> = {:?};",
build_info.hash()
)?;
writeln!(
fh,
"const COMMIT_DATE: Option<&'static str> = {:?};",
build_info.date()
)?;
Ok(())
}
fn get_build_info(dir: &Path) -> Box<dyn BuildInfo> {
if Path::exists(&dir.join(".hg")) {
Box::new(Hg {})
} else if Path::exists(&dir.join(".git")) {
Box::new(Git {})
} else if let Some(parent) = dir.parent() {
get_build_info(parent)
} else {
eprintln!("unable to detect vcs");
Box::new(Noop {})
}
}
trait BuildInfo {
fn hash(&self) -> Option<String>;
fn date(&self) -> Option<String>;
}
struct Hg;
impl Hg {
fn exec<I, S>(&self, args: I) -> Option<String>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
Command::new("hg")
.env("HGPLAIN", "1")
.args(args)
.output()
.ok()
.and_then(|r| String::from_utf8(r.stdout).ok())
.map(|s| s.trim_end().into())
}
}
impl BuildInfo for Hg {
fn hash(&self) -> Option<String> {
self.exec(["log", "-r.", "-T{node|short}"])
}
fn date(&self) -> Option<String> {
self.exec(["log", "-r.", "-T{date|isodate}"])
}
}
struct Git;
impl Git {
fn exec<I, S>(&self, args: I) -> Option<String>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
Command::new("git")
.env("GIT_CONFIG_NOSYSTEM", "1")
.args(args)
.output()
.ok()
.and_then(|r| String::from_utf8(r.stdout).ok())
.map(|s| s.trim_end().into())
}
fn to_hg_sha(&self, git_sha: String) -> Option<String> {
self.exec(["cinnabar", "git2hg", &git_sha])
}
}
impl BuildInfo for Git {
fn hash(&self) -> Option<String> {
self.exec(["rev-parse", "HEAD"])
.and_then(|sha| self.to_hg_sha(sha))
.map(|mut s| {
s.truncate(12);
s
})
}
fn date(&self) -> Option<String> {
self.exec(["log", "-1", "--date=short", "--pretty=format:%cd"])
}
}
struct Noop;
impl BuildInfo for Noop {
fn hash(&self) -> Option<String> {
None
}
fn date(&self) -> Option<String> {
None
}
}