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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//! Paths and helpers for running within a Chromium checkout.
use std::env;
use std::io;
use std::path::{Path, PathBuf};
/// Chromium source tree paths. All members other than `root` are relative to
/// `root`.
pub struct ChromiumPaths {
/// The chromium/src checkout root, as an absolute path.
pub root: PathBuf,
/// The third_party/rust directory.
pub third_party: &'static Path,
/// The Rust source tree, containing the standard library and vendored
/// dependencies.
pub rust_src: &'static Path,
pub rust_src_vendor: &'static Path,
pub rust_std: &'static Path,
}
impl ChromiumPaths {
/// Create the `ChromiumPaths` resolver. Accesses the filesystem to get the
/// checkout root.
pub fn new() -> io::Result<ChromiumPaths> {
// We should be invoked from the repository root.
let cur_dir = env::current_dir()?;
Ok(ChromiumPaths {
root: cur_dir.clone(),
third_party: check_path(&cur_dir, RUST_THIRD_PARTY_DIR)?,
rust_src: check_path(&cur_dir, RUST_SRC_DIR)?,
rust_src_vendor: check_path(&cur_dir, RUST_SRC_VENDOR_DIR)?,
rust_std: check_path(&cur_dir, RUST_STD_DIR)?,
})
}
}
fn check_path<'a>(root: &Path, p_str: &'a str) -> io::Result<&'a Path> {
let p = Path::new(p_str);
if !root.join(p).is_dir() {
return Err(io::Error::new(
io::ErrorKind::Other,
format!(
"could not find {} (invoked from Chromium checkout root? is use_rust enabled in .gclient?)",
p.display()
),
));
}
Ok(p)
}
static RUST_THIRD_PARTY_DIR: &str = "third_party/rust";
static RUST_SRC_DIR: &str = "third_party/rust_src/src";
static RUST_SRC_VENDOR_DIR: &str = "third_party/rust_src/src/vendor";
static RUST_STD_DIR: &str = "third_party/rust_src/src/library/std";
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