494 lines
19 KiB
Rust
494 lines
19 KiB
Rust
//! This tiny crate checks that the running or installed `rustc` meets some
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//! version requirements. The version is queried by calling the Rust compiler
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//! with `--version`. The path to the compiler is determined first via the
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//! `RUSTC` environment variable. If it is not set, then `rustc` is used. If
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//! that fails, no determination is made, and calls return `None`.
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//!
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//! # Examples
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//!
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//! * Set a `cfg` flag in `build.rs` if the running compiler was determined to
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//! be at least version `1.13.0`:
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//!
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//! ```rust
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//! extern crate version_check as rustc;
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//!
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//! if rustc::is_min_version("1.13.0").unwrap_or(false) {
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//! println!("cargo:rustc-cfg=question_mark_operator");
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//! }
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//! ```
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//!
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//! See [`is_max_version`] or [`is_exact_version`] to check if the compiler
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//! is _at most_ or _exactly_ a certain version.
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//!
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//! * Check that the running compiler was released on or after `2018-12-18`:
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//!
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//! ```rust
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//! extern crate version_check as rustc;
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//!
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//! match rustc::is_min_date("2018-12-18") {
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//! Some(true) => "Yep! It's recent!",
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//! Some(false) => "No, it's older.",
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//! None => "Couldn't determine the rustc version."
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//! };
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//! ```
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//!
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//! See [`is_max_date`] or [`is_exact_date`] to check if the compiler was
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//! released _prior to_ or _exactly on_ a certain date.
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//!
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//! * Check that the running compiler supports feature flags:
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//!
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//! ```rust
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//! extern crate version_check as rustc;
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//!
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//! match rustc::is_feature_flaggable() {
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//! Some(true) => "Yes! It's a dev or nightly release!",
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//! Some(false) => "No, it's stable or beta.",
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//! None => "Couldn't determine the rustc version."
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//! };
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//! ```
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//!
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//! * Check that the running compiler supports a specific feature:
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//!
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//! ```rust
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//! extern crate version_check as rustc;
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//!
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//! if let Some(true) = rustc::supports_feature("doc_cfg") {
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//! println!("cargo:rustc-cfg=has_doc_cfg");
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//! }
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//! ```
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//!
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//! * Check that the running compiler is on the stable channel:
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//!
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//! ```rust
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//! extern crate version_check as rustc;
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//!
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//! match rustc::Channel::read() {
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//! Some(c) if c.is_stable() => format!("Yes! It's stable."),
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//! Some(c) => format!("No, the channel {} is not stable.", c),
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//! None => format!("Couldn't determine the rustc version.")
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//! };
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//! ```
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//!
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//! To interact with the version, release date, and release channel as structs,
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//! use [`Version`], [`Date`], and [`Channel`], respectively. The [`triple()`]
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//! function returns all three values efficiently.
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//!
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//! # Alternatives
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//!
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//! This crate is dead simple with no dependencies. If you need something more
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//! and don't care about panicking if the version cannot be obtained, or if you
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//! don't mind adding dependencies, see
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//! [rustc_version](https://crates.io/crates/rustc_version).
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#![allow(deprecated)]
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mod version;
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mod channel;
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mod date;
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use std::env;
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use std::process::Command;
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#[doc(inline)] pub use version::*;
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#[doc(inline)] pub use channel::*;
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#[doc(inline)] pub use date::*;
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/// Parses (version, date) as available from rustc version string.
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fn version_and_date_from_rustc_version(s: &str) -> (Option<String>, Option<String>) {
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let last_line = s.lines().last().unwrap_or(s);
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let mut components = last_line.trim().split(" ");
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let version = components.nth(1);
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let date = components.filter(|c| c.ends_with(')')).next()
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.map(|s| s.trim_right().trim_right_matches(")").trim_left().trim_left_matches('('));
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(version.map(|s| s.to_string()), date.map(|s| s.to_string()))
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}
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/// Parses (version, date) as available from rustc verbose version output.
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fn version_and_date_from_rustc_verbose_version(s: &str) -> (Option<String>, Option<String>) {
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let (mut version, mut date) = (None, None);
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for line in s.lines() {
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let split = |s: &str| s.splitn(2, ":").nth(1).map(|s| s.trim().to_string());
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match line.trim().split(" ").nth(0) {
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Some("rustc") => {
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let (v, d) = version_and_date_from_rustc_version(line);
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version = version.or(v);
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date = date.or(d);
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},
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Some("release:") => version = split(line),
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Some("commit-date:") if line.ends_with("unknown") => date = None,
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Some("commit-date:") => date = split(line),
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_ => continue
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}
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}
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(version, date)
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}
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/// Returns (version, date) as available from `rustc --version`.
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fn get_version_and_date() -> Option<(Option<String>, Option<String>)> {
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let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
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Command::new(rustc).arg("--verbose").arg("--version").output().ok()
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.and_then(|output| String::from_utf8(output.stdout).ok())
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.map(|s| version_and_date_from_rustc_verbose_version(&s))
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}
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/// Reads the triple of [`Version`], [`Channel`], and [`Date`] of the installed
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/// or running `rustc`.
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///
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/// If any attribute cannot be determined (see the [top-level
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/// documentation](crate)), returns `None`.
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///
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/// To obtain only one of three attributes, use [`Version::read()`],
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/// [`Channel::read()`], or [`Date::read()`].
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pub fn triple() -> Option<(Version, Channel, Date)> {
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let (version_str, date_str) = match get_version_and_date() {
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Some((Some(version), Some(date))) => (version, date),
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_ => return None
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};
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// Can't use `?` or `try!` for `Option` in 1.0.0.
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match Version::parse(&version_str) {
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Some(version) => match Channel::parse(&version_str) {
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Some(channel) => match Date::parse(&date_str) {
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Some(date) => Some((version, channel, date)),
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_ => None,
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},
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_ => None,
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},
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` was released **on or after**
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/// some date.
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///
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/// The format of `min_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
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/// `2017-01-09`.
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///
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/// If the date cannot be retrieved or parsed, or if `min_date` could not be
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/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
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/// was release on or after `min_date` and `false` otherwise.
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pub fn is_min_date(min_date: &str) -> Option<bool> {
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match (Date::read(), Date::parse(min_date)) {
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(Some(rustc_date), Some(min_date)) => Some(rustc_date >= min_date),
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` was released **on or before**
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/// some date.
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///
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/// The format of `max_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
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/// `2017-01-09`.
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///
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/// If the date cannot be retrieved or parsed, or if `max_date` could not be
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/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
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/// was release on or before `max_date` and `false` otherwise.
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pub fn is_max_date(max_date: &str) -> Option<bool> {
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match (Date::read(), Date::parse(max_date)) {
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(Some(rustc_date), Some(max_date)) => Some(rustc_date <= max_date),
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` was released **exactly** on
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/// some date.
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///
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/// The format of `date` must be YYYY-MM-DD. For instance: `2016-12-20` or
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/// `2017-01-09`.
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///
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/// If the date cannot be retrieved or parsed, or if `date` could not be parsed,
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/// returns `None`. Otherwise returns `true` if the installed `rustc` was
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/// release on `date` and `false` otherwise.
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pub fn is_exact_date(date: &str) -> Option<bool> {
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match (Date::read(), Date::parse(date)) {
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(Some(rustc_date), Some(date)) => Some(rustc_date == date),
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` is **at least** some minimum
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/// version.
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///
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/// The format of `min_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
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/// `1.14.0`, `1.16.0-nightly`, etc.
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///
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/// If the version cannot be retrieved or parsed, or if `min_version` could not
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/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
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/// is at least `min_version` and `false` otherwise.
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pub fn is_min_version(min_version: &str) -> Option<bool> {
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match (Version::read(), Version::parse(min_version)) {
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(Some(rustc_ver), Some(min_ver)) => Some(rustc_ver >= min_ver),
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` is **at most** some maximum
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/// version.
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///
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/// The format of `max_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
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/// `1.14.0`, `1.16.0-nightly`, etc.
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///
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/// If the version cannot be retrieved or parsed, or if `max_version` could not
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/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
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/// is at most `max_version` and `false` otherwise.
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pub fn is_max_version(max_version: &str) -> Option<bool> {
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match (Version::read(), Version::parse(max_version)) {
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(Some(rustc_ver), Some(max_ver)) => Some(rustc_ver <= max_ver),
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_ => None
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}
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}
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/// Checks that the running or installed `rustc` is **exactly** some version.
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///
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/// The format of `version` is a semantic version: `1.3.0`, `1.15.0-beta`,
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/// `1.14.0`, `1.16.0-nightly`, etc.
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///
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/// If the version cannot be retrieved or parsed, or if `version` could not be
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/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc` is
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/// exactly `version` and `false` otherwise.
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pub fn is_exact_version(version: &str) -> Option<bool> {
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match (Version::read(), Version::parse(version)) {
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(Some(rustc_ver), Some(version)) => Some(rustc_ver == version),
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_ => None
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}
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}
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/// Checks whether the running or installed `rustc` supports feature flags.
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///
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/// In other words, if the channel is either "nightly" or "dev".
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///
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/// Note that support for specific `rustc` features can be enabled or disabled
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/// via the `allow-features` compiler flag, which this function _does not_
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/// check. That is, this function _does not_ check whether a _specific_ feature
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/// is supported, but instead whether features are supported at all. To check
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/// for support for a specific feature, use [`supports_feature()`].
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///
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/// If the version could not be determined, returns `None`. Otherwise returns
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/// `true` if the running version supports feature flags and `false` otherwise.
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pub fn is_feature_flaggable() -> Option<bool> {
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Channel::read().map(|c| c.supports_features())
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}
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/// Checks whether the running or installed `rustc` supports `feature`.
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///
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/// Returns _true_ _iff_ [`is_feature_flaggable()`] returns `true` _and_ the
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/// feature is not disabled via exclusion in `allow-features` via `RUSTFLAGS` or
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/// `CARGO_ENCODED_RUSTFLAGS`. If the version could not be determined, returns
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/// `None`.
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///
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/// # Example
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///
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/// ```rust
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/// use version_check as rustc;
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///
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/// if let Some(true) = rustc::supports_feature("doc_cfg") {
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/// println!("cargo:rustc-cfg=has_doc_cfg");
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/// }
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/// ```
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pub fn supports_feature(feature: &str) -> Option<bool> {
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match is_feature_flaggable() {
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Some(true) => { /* continue */ }
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Some(false) => return Some(false),
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None => return None,
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}
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let env_flags = env::var_os("CARGO_ENCODED_RUSTFLAGS")
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.map(|flags| (flags, '\x1f'))
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.or_else(|| env::var_os("RUSTFLAGS").map(|flags| (flags, ' ')));
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if let Some((flags, delim)) = env_flags {
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const ALLOW_FEATURES: &'static str = "allow-features=";
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let rustflags = flags.to_string_lossy();
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let allow_features = rustflags.split(delim)
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.map(|flag| flag.trim_left_matches("-Z").trim())
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.filter(|flag| flag.starts_with(ALLOW_FEATURES))
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.map(|flag| &flag[ALLOW_FEATURES.len()..]);
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if let Some(allow_features) = allow_features.last() {
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return Some(allow_features.split(',').any(|f| f.trim() == feature));
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}
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}
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// If there are no `RUSTFLAGS` or `CARGO_ENCODED_RUSTFLAGS` or they don't
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// contain an `allow-features` flag, assume compiler allows all features.
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Some(true)
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}
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#[cfg(test)]
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mod tests {
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use std::{env, fs};
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use super::version_and_date_from_rustc_version;
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use super::version_and_date_from_rustc_verbose_version;
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macro_rules! check_parse {
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(@ $f:expr, $s:expr => $v:expr, $d:expr) => ({
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if let (Some(v), d) = $f(&$s) {
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let e_d: Option<&str> = $d.into();
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assert_eq!((v, d), ($v.to_string(), e_d.map(|s| s.into())));
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} else {
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panic!("{:?} didn't parse for version testing.", $s);
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}
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});
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($f:expr, $s:expr => $v:expr, $d:expr) => ({
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let warn = "warning: invalid logging spec 'warning', ignoring it";
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let warn2 = "warning: sorry, something went wrong :(sad)";
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check_parse!(@ $f, $s => $v, $d);
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check_parse!(@ $f, &format!("{}\n{}", warn, $s) => $v, $d);
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check_parse!(@ $f, &format!("{}\n{}", warn2, $s) => $v, $d);
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check_parse!(@ $f, &format!("{}\n{}\n{}", warn, warn2, $s) => $v, $d);
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check_parse!(@ $f, &format!("{}\n{}\n{}", warn2, warn, $s) => $v, $d);
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})
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}
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macro_rules! check_terse_parse {
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($($s:expr => $v:expr, $d:expr,)+) => {$(
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check_parse!(version_and_date_from_rustc_version, $s => $v, $d);
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)+}
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}
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macro_rules! check_verbose_parse {
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($($s:expr => $v:expr, $d:expr,)+) => {$(
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check_parse!(version_and_date_from_rustc_verbose_version, $s => $v, $d);
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)+}
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}
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#[test]
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fn test_version_parse() {
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check_terse_parse! {
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"rustc 1.18.0" => "1.18.0", None,
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"rustc 1.8.0" => "1.8.0", None,
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"rustc 1.20.0-nightly" => "1.20.0-nightly", None,
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"rustc 1.20" => "1.20", None,
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"rustc 1.3" => "1.3", None,
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"rustc 1" => "1", None,
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"rustc 1.5.1-beta" => "1.5.1-beta", None,
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"rustc 1.20.0 (2017-07-09)" => "1.20.0", Some("2017-07-09"),
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"rustc 1.20.0-dev (2017-07-09)" => "1.20.0-dev", Some("2017-07-09"),
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"rustc 1.20.0-nightly (d84693b93 2017-07-09)" => "1.20.0-nightly", Some("2017-07-09"),
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"rustc 1.20.0 (d84693b93 2017-07-09)" => "1.20.0", Some("2017-07-09"),
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"rustc 1.30.0-nightly (3bc2ca7e4 2018-09-20)" => "1.30.0-nightly", Some("2018-09-20"),
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};
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}
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#[test]
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fn test_verbose_version_parse() {
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check_verbose_parse! {
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"rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
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binary: rustc\n\
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commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
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commit-date: 2015-05-13\n\
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build-date: 2015-05-14\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.0.0" => "1.0.0", Some("2015-05-13"),
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"rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
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commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
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commit-date: 2015-05-13\n\
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build-date: 2015-05-14\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.0.0" => "1.0.0", Some("2015-05-13"),
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"rustc 1.50.0 (cb75ad5db 2021-02-10)\n\
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binary: rustc\n\
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commit-hash: cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\n\
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commit-date: 2021-02-10\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.50.0" => "1.50.0", Some("2021-02-10"),
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"rustc 1.52.0-nightly (234781afe 2021-03-07)\n\
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binary: rustc\n\
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commit-hash: 234781afe33d3f339b002f85f948046d8476cfc9\n\
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commit-date: 2021-03-07\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.52.0-nightly\n\
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LLVM version: 12.0.0" => "1.52.0-nightly", Some("2021-03-07"),
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"rustc 1.41.1\n\
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binary: rustc\n\
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commit-hash: unknown\n\
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commit-date: unknown\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.41.1\n\
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LLVM version: 7.0" => "1.41.1", None,
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"rustc 1.49.0\n\
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binary: rustc\n\
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commit-hash: unknown\n\
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commit-date: unknown\n\
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host: x86_64-unknown-linux-gnu\n\
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release: 1.49.0" => "1.49.0", None,
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"rustc 1.50.0 (Fedora 1.50.0-1.fc33)\n\
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binary: rustc\n\
|
|
commit-hash: unknown\n\
|
|
commit-date: unknown\n\
|
|
host: x86_64-unknown-linux-gnu\n\
|
|
release: 1.50.0" => "1.50.0", None,
|
|
};
|
|
}
|
|
|
|
fn read_static(verbose: bool, channel: &str, minor: usize) -> String {
|
|
use std::fs::File;
|
|
use std::path::Path;
|
|
use std::io::{BufReader, Read};
|
|
|
|
let subdir = if verbose { "verbose" } else { "terse" };
|
|
let path = Path::new(STATIC_PATH)
|
|
.join(channel)
|
|
.join(subdir)
|
|
.join(format!("rustc-1.{}.0", minor));
|
|
|
|
let file = File::open(path).unwrap();
|
|
let mut buf_reader = BufReader::new(file);
|
|
let mut contents = String::new();
|
|
buf_reader.read_to_string(&mut contents).unwrap();
|
|
contents
|
|
}
|
|
|
|
static STATIC_PATH: &'static str = concat!(env!("CARGO_MANIFEST_DIR"), "/static");
|
|
|
|
static DATES: [&'static str; 51] = [
|
|
"2015-05-13", "2015-06-19", "2015-08-03", "2015-09-15", "2015-10-27",
|
|
"2015-12-04", "2016-01-19", "2016-02-29", "2016-04-11", "2016-05-18",
|
|
"2016-07-03", "2016-08-15", "2016-09-23", "2016-11-07", "2016-12-16",
|
|
"2017-01-19", "2017-03-10", "2017-04-24", "2017-06-06", "2017-07-17",
|
|
"2017-08-27", "2017-10-09", "2017-11-20", "2018-01-01", "2018-02-12",
|
|
"2018-03-25", "2018-05-07", "2018-06-19", "2018-07-30", "2018-09-11",
|
|
"2018-10-24", "2018-12-04", "2019-01-16", "2019-02-28", "2019-04-10",
|
|
"2019-05-20", "2019-07-03", "2019-08-13", "2019-09-23", "2019-11-04",
|
|
"2019-12-16", "2020-01-27", "2020-03-09", "2020-04-20", "2020-06-01",
|
|
"2020-07-13", "2020-08-24", "2020-10-07", "2020-11-16", "2020-12-29",
|
|
"2021-02-10",
|
|
];
|
|
|
|
#[test]
|
|
fn test_stable_compatibility() {
|
|
if env::var_os("FORCE_STATIC").is_none() && fs::metadata(STATIC_PATH).is_err() {
|
|
// We exclude `/static` when we package `version_check`, so don't
|
|
// run if static files aren't present unless we know they should be.
|
|
return;
|
|
}
|
|
|
|
// Ensure we can parse all output from all Linux stable releases.
|
|
for v in 0..DATES.len() {
|
|
let (version, date) = (&format!("1.{}.0", v), Some(DATES[v]));
|
|
check_terse_parse!(read_static(false, "stable", v) => version, date,);
|
|
check_verbose_parse!(read_static(true, "stable", v) => version, date,);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_current() {
|
|
let (version, channel) = (::Version::read(), ::Channel::read());
|
|
assert!(version.is_some());
|
|
assert!(channel.is_some());
|
|
|
|
if let Ok(known_channel) = env::var("KNOWN_CHANNEL") {
|
|
assert_eq!(channel, ::Channel::parse(&known_channel));
|
|
}
|
|
}
|
|
}
|