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54 lines
2.4 KiB
Rust
54 lines
2.4 KiB
Rust
use std::env;
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use xtask::AYA_BUILD_INTEGRATION_BPF;
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/// Building this crate has an undeclared dependency on the `bpf-linker` binary. This would be
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/// better expressed by [artifact-dependencies][bindeps] but issues such as
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/// https://github.com/rust-lang/cargo/issues/12385 make their use impractical for the time being.
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///
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/// This file implements an imperfect solution: it causes cargo to rebuild the crate whenever the
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/// mtime of `which bpf-linker` changes. Note that possibility that a new bpf-linker is added to
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/// $PATH ahead of the one used as the cache key still exists. Solving this in the general case
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/// would require rebuild-if-changed-env=PATH *and* rebuild-if-changed={every-directory-in-PATH}
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/// which would likely mean far too much cache invalidation.
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///
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/// [bindeps]: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html?highlight=feature#artifact-dependencies
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fn main() {
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println!("cargo:rerun-if-env-changed={}", AYA_BUILD_INTEGRATION_BPF);
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let build_integration_bpf = env::var(AYA_BUILD_INTEGRATION_BPF)
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.as_deref()
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.map(str::parse)
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.map(Result::unwrap)
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.unwrap_or_default();
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if build_integration_bpf {
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let out_dir = env::var_os("OUT_DIR").unwrap();
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let out_dir = std::path::PathBuf::from(out_dir);
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let bpf_linker = env::var("CARGO_BIN_FILE_BPF_LINKER").unwrap();
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// There seems to be no way to pass `-Clinker={}` to rustc from here.
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//
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// We assume rustc is going to look for `bpf-linker` on the PATH, so we can create a symlink
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// and put it on the PATH.
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let bin_dir = out_dir.join("bin");
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std::fs::create_dir_all(&bin_dir).unwrap();
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let bpf_linker_symlink = bin_dir.join("bpf-linker");
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match std::fs::remove_file(&bpf_linker_symlink) {
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Ok(()) => {}
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Err(err) => {
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if err.kind() != std::io::ErrorKind::NotFound {
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panic!("failed to remove symlink: {err}")
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}
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}
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}
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std::os::unix::fs::symlink(bpf_linker, bpf_linker_symlink).unwrap();
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let path = env::var_os("PATH");
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let path = path.as_ref();
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let paths = std::iter::once(bin_dir).chain(path.into_iter().flat_map(env::split_paths));
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let path = env::join_paths(paths).unwrap();
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println!("cargo:rustc-env=PATH={}", path.to_str().unwrap());
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}
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}
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