56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
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//! Build script that can be used outside of Nix builds to inject the
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//! ATWARD_INDEX_HTML variable when building in development mode.
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//!
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//! Note that this script assumes that atward is in a checkout of the
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//! TVL depot.
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use std::process::Command;
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static ATWARD_INDEX_HTML: &str = "ATWARD_INDEX_HTML";
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static ERROR_MESSAGE: &str = r#"Failed to build index page.
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When building during development, atward expects to be in a checkout
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of the TVL depot. This is required to automatically build the index
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page that is needed at compile time.
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As atward can not automatically detect the location of the page,
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you must set the `ATWARD_INDEX_HTML` environment variable to the
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right path.
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The expected page is build using the files in //web/atward/indexHtml
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in the depot."#;
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fn main() {
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// Do nothing if the variable is already set (e.g. via Nix)
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if let Ok(_) = std::env::var(ATWARD_INDEX_HTML) {
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return;
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}
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// Otherwise ask Nix to build it and inject the result.
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let output = Command::new("nix-build")
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.arg("-A")
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.arg("web.atward.indexHtml")
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// ... assuming atward is at //web/atward ...
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.arg("../..")
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.output()
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.expect(ERROR_MESSAGE);
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if !output.status.success() {
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eprintln!(
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"{}\nNix output: {}",
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ERROR_MESSAGE,
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String::from_utf8_lossy(&output.stderr)
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);
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return;
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}
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let out_path = String::from_utf8(output.stdout)
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.expect("Nix returned invalid output after building index page");
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// Return an instruction to Cargo that will set the environment
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// variable during rustc calls.
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//
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// https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-envvarvalue
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println!("cargo:rustc-env={}={}", ATWARD_INDEX_HTML, out_path.trim());
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}
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