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|
//! A helper tool for generating urls and sha256 checksums of cargo-bazel binaries and writing them to a module.
use std::collections::BTreeMap;
use std::io::{BufRead, BufReader};
use std::path::{Path, PathBuf};
use std::process::Command;
use std::{env, fs};
use clap::Parser;
use hex::ToHex;
use sha2::{Digest, Sha256};
#[derive(Parser, Debug)]
struct Options {
/// The path to an artifacts directory expecting to contain directories
/// named after platform tripes with binaries inside.
#[clap(long)]
pub artifacts_dir: PathBuf,
/// A url prefix where the artifacts can be found
#[clap(long)]
pub url_prefix: String,
/// The path to a buildifier binary. If set, it will be ran on the module
#[clap(long)]
pub buildifier: Option<PathBuf>,
}
struct Artifact {
pub url: String,
pub triple: String,
pub sha256: String,
}
fn calculate_sha256(file_path: &Path) -> String {
let file = fs::File::open(file_path).unwrap();
let mut reader = BufReader::new(file);
let mut hasher = Sha256::new();
loop {
let consummed = {
let buffer = reader.fill_buf().unwrap();
if buffer.is_empty() {
break;
}
hasher.update(buffer);
buffer.len()
};
reader.consume(consummed);
}
let digest = hasher.finalize();
digest.encode_hex::<String>()
}
fn locate_artifacts(artifacts_dir: &Path, url_prefix: &str) -> Vec<Artifact> {
let artifact_dirs: Vec<PathBuf> = artifacts_dir
.read_dir()
.unwrap()
.flatten()
.filter(|entry| entry.path().is_dir())
.map(|entry| entry.path())
.collect();
artifact_dirs
.iter()
.map(|path| {
let triple = path.file_name().unwrap().to_string_lossy();
let mut artifacts: Vec<Artifact> = path
.read_dir()
.unwrap()
.flatten()
.map(|f_entry| {
let f_path = f_entry.path();
let stem = f_path.file_stem().unwrap().to_string_lossy();
let extension = f_path
.extension()
.map(|ext| format!(".{}", ext.to_string_lossy()))
.unwrap_or_default();
Artifact {
url: format!("{url_prefix}/{stem}-{triple}{extension}"),
triple: triple.to_string(),
sha256: calculate_sha256(&f_entry.path()),
}
})
.collect();
if artifacts.len() > 1 {
panic!("Too many artifacts given for {}", triple)
}
artifacts.pop().unwrap()
})
.collect()
}
const TEMPLATE: &str = r#""""A file containing urls and associated sha256 values for cargo-bazel binaries
This file is auto-generated for each release to match the urls and sha256s of
the binaries produced for it.
"""
# Example:
# {
# "x86_64-unknown-linux-gnu": "https://domain.com/downloads/cargo-bazel-x86_64-unknown-linux-gnu",
# "x86_64-apple-darwin": "https://domain.com/downloads/cargo-bazel-x86_64-apple-darwin",
# "x86_64-pc-windows-msvc": "https://domain.com/downloads/cargo-bazel-x86_64-pc-windows-msvc",
# }
CARGO_BAZEL_URLS = {}
# Example:
# {
# "x86_64-unknown-linux-gnu": "1d687fcc860dc8a1aa6198e531f0aee0637ed506d6a412fe2b9884ff5b2b17c0",
# "x86_64-apple-darwin": "0363e450125002f581d29cf632cc876225d738cfa433afa85ca557afb671eafa",
# "x86_64-pc-windows-msvc": "f5647261d989f63dafb2c3cb8e131b225338a790386c06cf7112e43dd9805882",
# }
CARGO_BAZEL_SHA256S = {}
# Example:
# Label("//crate_universe:cargo_bazel_bin")
CARGO_BAZEL_LABEL = Label("@cargo_bazel_bootstrap//:binary")
"#;
fn render_module(artifacts: &[Artifact]) -> String {
let urls: BTreeMap<&String, &String> = artifacts
.iter()
.map(|artifact| (&artifact.triple, &artifact.url))
.collect();
let sha256s: BTreeMap<&String, &String> = artifacts
.iter()
.map(|artifact| (&artifact.triple, &artifact.sha256))
.collect();
TEMPLATE
.replace(
"CARGO_BAZEL_URLS = {}",
&format!(
"CARGO_BAZEL_URLS = {}",
serde_json::to_string_pretty(&urls).unwrap()
),
)
.replace(
"CARGO_BAZEL_SHA256S = {}",
&format!(
"CARGO_BAZEL_SHA256S = {}",
serde_json::to_string_pretty(&sha256s).unwrap()
),
)
.replace(
"CARGO_BAZEL_LABEL = Label(\"@cargo_bazel_bootstrap//:binary\")",
"CARGO_BAZEL_LABEL = Label(\"//crate_universe:cargo_bazel_bin\")",
)
}
fn write_module(content: &str) -> PathBuf {
let dest = PathBuf::from(
env::var("BUILD_WORKSPACE_DIRECTORY").expect("This binary is required to run under Bazel"),
)
.join(env!("MODULE_ROOT_PATH"));
fs::write(&dest, content).unwrap();
dest
}
fn run_buildifier(buildifier_path: &Path, module: &Path) {
Command::new(buildifier_path)
.arg("-lint=fix")
.arg("-mode=fix")
.arg("-warnings=all")
.arg(module)
.output()
.unwrap();
}
fn main() {
let opt = Options::parse();
let artifacts = locate_artifacts(&opt.artifacts_dir, &opt.url_prefix);
let content = render_module(&artifacts);
let path = write_module(&content);
if let Some(buildifier_path) = opt.buildifier {
run_buildifier(&buildifier_path, &path);
}
}
|
