75 lines
2.4 KiB
Rust
75 lines
2.4 KiB
Rust
// Import some modules from this crate inline to generate the build config.
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// Allow dead code because not all code in the modules is used in this build script.
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#[path = "src/impl_.rs"]
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#[allow(dead_code)]
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mod impl_;
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#[path = "src/errors.rs"]
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#[allow(dead_code)]
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mod errors;
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use std::{env, path::Path};
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use errors::{Context, Result};
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use impl_::{env_var, make_interpreter_config, InterpreterConfig};
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fn configure(interpreter_config: Option<InterpreterConfig>, name: &str) -> Result<bool> {
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let target = Path::new(&env::var_os("OUT_DIR").unwrap()).join(name);
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if let Some(config) = interpreter_config {
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config
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.to_writer(&mut std::fs::File::create(&target).with_context(|| {
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format!("failed to write config file at {}", target.display())
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})?)?;
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Ok(true)
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} else {
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std::fs::File::create(&target)
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.with_context(|| format!("failed to create new file at {}", target.display()))?;
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Ok(false)
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}
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}
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/// If PYO3_CONFIG_FILE is set, copy it into the crate.
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fn config_file() -> Result<Option<InterpreterConfig>> {
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if let Some(path) = env_var("PYO3_CONFIG_FILE") {
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let path = Path::new(&path);
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println!("cargo:rerun-if-changed={}", path.display());
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// Absolute path is necessary because this build script is run with a cwd different to the
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// original `cargo build` instruction.
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ensure!(
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path.is_absolute(),
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"PYO3_CONFIG_FILE must be an absolute path"
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);
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let interpreter_config = InterpreterConfig::from_path(path)
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.context("failed to parse contents of PYO3_CONFIG_FILE")?;
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Ok(Some(interpreter_config))
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} else {
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Ok(None)
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}
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}
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fn generate_build_configs() -> Result<()> {
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let configured = configure(config_file()?, "pyo3-build-config-file.txt")?;
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if configured {
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// Don't bother trying to find an interpreter on the host system
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// if the user-provided config file is present.
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configure(None, "pyo3-build-config.txt")?;
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} else {
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configure(Some(make_interpreter_config()?), "pyo3-build-config.txt")?;
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}
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Ok(())
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}
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fn main() {
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if std::env::var("CARGO_FEATURE_RESOLVE_CONFIG").is_ok() {
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if let Err(e) = generate_build_configs() {
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eprintln!("error: {}", e.report());
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std::process::exit(1)
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}
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} else {
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eprintln!("resolve-config feature not enabled; build script in no-op mode");
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}
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}
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