From 858bec68bc3e1b60c1fbd09e8b3b2a58e73e764a Mon Sep 17 00:00:00 2001 From: Robert Hensing Date: Fri, 16 Feb 2024 09:45:29 +0100 Subject: [PATCH] feat: Add crate nix-c-raw See README. Most of this is in accordance with the bindgen introduction. The c_headers function was taken from Zach Mitchell's work on bindings. Co-authored-by: Zach Mitchell (cherry picked from commit 83d8ae6b26d341bbd452a77d7361f58c06a2d322) --- rust/Cargo.lock | 443 +++++++++++++++++++++++++++++ rust/Cargo.toml | 1 + rust/nix-c-raw/Cargo.toml | 11 + rust/nix-c-raw/README.md | 12 + rust/nix-c-raw/build.rs | 42 +++ rust/nix-c-raw/include/nix-c-raw.h | 3 + rust/nix-c-raw/src/lib.rs | 5 + 7 files changed, 517 insertions(+) create mode 100644 rust/Cargo.lock create mode 100644 rust/nix-c-raw/Cargo.toml create mode 100644 rust/nix-c-raw/README.md create mode 100644 rust/nix-c-raw/build.rs create mode 100644 rust/nix-c-raw/include/nix-c-raw.h create mode 100644 rust/nix-c-raw/src/lib.rs diff --git a/rust/Cargo.lock b/rust/Cargo.lock new file mode 100644 index 0000000..b987df7 --- /dev/null +++ b/rust/Cargo.lock @@ -0,0 +1,443 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "aho-corasick" +version = "1.1.2" +source = 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"nix-c-raw" +version = "0.1.0" +edition = "2021" +build = "build.rs" + +[lib] + +[build-dependencies] +bindgen = "0.69.4" +pkg-config = "0.3.30" diff --git a/rust/nix-c-raw/README.md b/rust/nix-c-raw/README.md new file mode 100644 index 0000000..dc9d8b4 --- /dev/null +++ b/rust/nix-c-raw/README.md @@ -0,0 +1,12 @@ +# nix-c-raw + +This crate contains generated bindings for the Nix C API. +**You should not have to use this crate directly,** and so you should probably not add it to your dependencies. +Instead, use the `nix-util`, `nix-store` and `nix-expr` crates, which _should_ be sufficient. + +## Design + +Rust bindgen currently does not allow "layered" libraries to be split into separate crates. +For example, the expr crate would have all-new types that are distinct and incompatible with the store crate. + +Ideally bindgen will support reusing already generated modules, and we could move the code generation into the appropriate crates, so that the system dependencies of each crate become accurate. diff --git a/rust/nix-c-raw/build.rs b/rust/nix-c-raw/build.rs new file mode 100644 index 0000000..d8c6679 --- /dev/null +++ b/rust/nix-c-raw/build.rs @@ -0,0 +1,42 @@ +use bindgen; +use std::env; +use std::path::PathBuf; + +fn main() { + // Tell cargo to invalidate the built crate whenever the wrapper changes + println!("cargo:rerun-if-changed=include/nix-c-raw.h"); + + // https://rust-lang.github.io/rust-bindgen/library-usage.html + let bindings = bindgen::Builder::default() + .header("include/nix-c-raw.h") + // Find the includes + .clang_args(c_headers()) + // Tell cargo to invalidate the built crate whenever any of the + // included header files changed. + .parse_callbacks(Box::new(bindgen::CargoCallbacks::new())) + // Finish the builder and generate the bindings. + .generate() + // Unwrap the Result and panic on failure. + .expect("Unable to generate bindings"); + + // Write the bindings to the $OUT_DIR/bindings.rs file. + let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()); + bindings + .write_to_file(out_path.join("bindings.rs")) + .expect("Couldn't write bindings!"); +} + +fn c_headers() -> Vec { + let mut args = Vec::new(); + // args.push("-isystem".to_string()); + for path in pkg_config::probe_library("nix-expr-c") + .unwrap() + .include_paths + .iter() + { + args.push(format!("-I{}", path.to_str().unwrap())); + } + // write to stderr for debugging + eprintln!("c_headers: {:?}", args); + args +} diff --git a/rust/nix-c-raw/include/nix-c-raw.h b/rust/nix-c-raw/include/nix-c-raw.h new file mode 100644 index 0000000..81883f6 --- /dev/null +++ b/rust/nix-c-raw/include/nix-c-raw.h @@ -0,0 +1,3 @@ +#include +#include +#include diff --git a/rust/nix-c-raw/src/lib.rs b/rust/nix-c-raw/src/lib.rs new file mode 100644 index 0000000..a38a13a --- /dev/null +++ b/rust/nix-c-raw/src/lib.rs @@ -0,0 +1,5 @@ +#![allow(non_upper_case_globals)] +#![allow(non_camel_case_types)] +#![allow(non_snake_case)] + +include!(concat!(env!("OUT_DIR"), "/bindings.rs"));