111 lines
3.9 KiB
Rust
111 lines
3.9 KiB
Rust
//! This build script ensures that Clippy is not compiled with an
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//! incompatible version of rust. It will panic with a descriptive
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//! error message instead.
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//!
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//! We specifially want to ensure that Clippy is only built with a
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//! rustc version that is newer or equal to the one specified in the
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//! `min_version.txt` file.
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//!
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//! `min_version.txt` is in the repo but also in the `.gitignore` to
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//! make sure that it is not updated manually by accident. Only CI
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//! should update that file.
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//!
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//! This build script was originally taken from the Rocket web framework:
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//! https://github.com/SergioBenitez/Rocket
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use ansi_term::Colour::Red;
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use rustc_version::{version_meta, version_meta_for, Channel, Version, VersionMeta};
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use std::env;
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fn main() {
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check_rustc_version();
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// Forward the profile to the main compilation
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println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
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// Don't rebuild even if nothing changed
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println!("cargo:rerun-if-changed=build.rs");
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}
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fn check_rustc_version() {
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let string = include_str!("min_version.txt");
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let min_version_meta = version_meta_for(string).expect("Could not parse version string in min_version.txt");
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let current_version_meta = version_meta().expect("Could not retrieve current rustc version information from ENV");
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let min_version = min_version_meta.clone().semver;
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let min_date_str = min_version_meta
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.clone()
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.commit_date
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.expect("min_version.txt does not contain a rustc commit date");
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// Dev channel (rustc built from git) does not have any date or commit information in rustc -vV
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// `current_version_meta.commit_date` would crash, so we return early here.
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if current_version_meta.channel == Channel::Dev {
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return;
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}
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let current_version = current_version_meta.clone().semver;
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let current_date_str = current_version_meta
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.clone()
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.commit_date
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.expect("current rustc version information does not contain a rustc commit date");
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let print_version_err = |version: &Version, date: &str| {
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eprintln!(
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"> {} {}. {} {}.\n",
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"Installed rustc version is:",
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format!("{} ({})", version, date),
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"Minimum required rustc version:",
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format!("{} ({})", min_version, min_date_str)
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);
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};
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if !correct_channel(¤t_version_meta) {
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eprintln!(
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"\n{} {}",
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Red.bold().paint("error:"),
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"Clippy requires a nightly version of Rust."
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);
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print_version_err(¤t_version, &*current_date_str);
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eprintln!(
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"{}{}{}",
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"See the README (", "https://github.com/rust-lang-nursery/rust-clippy#usage", ") for more information."
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);
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panic!("Aborting compilation due to incompatible compiler.")
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}
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let current_date = str_to_ymd(¤t_date_str).unwrap();
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let min_date = str_to_ymd(&min_date_str).unwrap();
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if current_date < min_date {
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eprintln!(
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"\n{} {}",
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Red.bold().paint("error:"),
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"Clippy does not support this version of rustc nightly."
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);
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eprintln!(
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"> {}{}{}",
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"Use `", "rustup update", "` or your preferred method to update Rust."
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);
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print_version_err(¤t_version, &*current_date_str);
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panic!("Aborting compilation due to incompatible compiler.")
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}
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}
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fn correct_channel(version_meta: &VersionMeta) -> bool {
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match version_meta.channel {
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Channel::Stable | Channel::Beta => false,
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Channel::Nightly | Channel::Dev => true,
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}
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}
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/// Convert a string of %Y-%m-%d to a single u32 maintaining ordering.
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fn str_to_ymd(ymd: &str) -> Option<u32> {
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let ymd: Vec<u32> = ymd.split("-").filter_map(|s| s.parse::<u32>().ok()).collect();
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if ymd.len() != 3 {
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return None;
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}
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let (y, m, d) = (ymd[0], ymd[1], ymd[2]);
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Some((y << 9) | (m << 5) | d)
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}
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