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48 lines
1.4 KiB
48 lines
1.4 KiB
mod rustc;
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use std::env;
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use std::ffi::OsString;
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use std::fs;
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use std::path::Path;
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use std::process::{self, Command};
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fn main() {
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let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
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let output = match Command::new(&rustc).arg("--version").output() {
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Ok(output) => output,
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Err(e) => {
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let rustc = rustc.to_string_lossy();
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eprintln!("Error: failed to run `{} --version`: {}", rustc, e);
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process::exit(1);
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}
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};
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let string = match String::from_utf8(output.stdout) {
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Ok(string) => string,
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Err(e) => {
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let rustc = rustc.to_string_lossy();
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eprintln!(
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"Error: failed to parse output of `{} --version`: {}",
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rustc, e,
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);
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process::exit(1);
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}
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};
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let version = match rustc::parse(&string) {
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Some(version) => format!("{:#?}\n", version),
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None => {
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eprintln!(
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"Error: unexpected output from `rustc --version`: {:?}\n\n\
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Please file an issue in https://github.com/dtolnay/rustversion",
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string
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);
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process::exit(1);
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}
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};
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let out_dir = env::var_os("OUT_DIR").expect("OUT_DIR not set");
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let out_file = Path::new(&out_dir).join("version.rs");
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fs::write(out_file, version).expect("failed to write version.rs");
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}
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