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36 lines
1.5 KiB
Rust
36 lines
1.5 KiB
Rust
use std::{env, path::PathBuf};
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use xtask::{create_symlink_to_binary, 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 = PathBuf::from(out_dir);
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let bpf_linker_symlink = create_symlink_to_binary(&out_dir, "bpf-linker").unwrap();
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println!(
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"cargo:rerun-if-changed={}",
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bpf_linker_symlink.to_str().unwrap()
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);
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}
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}
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