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Do not recompile installer if files are missing

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Currently the installer is recompiled everytime a file is missing, even
if the file has been missing before and after the last compilation.

That is because rerun-if-changed on a nonexistent filepath constantly
busts the cache.
This commit is contained in:
Markus Unterwaditzer
2026-05-16 20:26:07 +02:00
committed by Cooper Quintin
parent 3e53aef145
commit 4526203af8
1 changed files with 19 additions and 1 deletions
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20
installer/build.rs
View File

@@ -28,7 +28,10 @@ fn set_binary_var(include_dir: &Path, var: &str, file: &str) {
return;
}
let binary = include_dir.join(file);
println!("cargo::rerun-if-changed={}", binary.display());
// We need to rerun the build script if the file starts appearing or disappearing, to emit the
// right warnings and change the envvar's value. We don't really need to rerun the build script
// if the file changes contents.
watch_file(&binary);
if binary.exists() {
println!("cargo::rustc-env={var}={}", binary.display());
} else {
@@ -40,3 +43,18 @@ fn set_binary_var(include_dir: &Path, var: &str, file: &str) {
println!("cargo::rustc-env={var}=");
}
}
/// Rerun the build script if the file changes or it appears, or disappears.
///
/// Simply emitting rerun-if-changed for a nonexistent filepath (such as wpa_supplicant) will make
/// cargo recompile everything all the time. Therefore, if the file does not exist we need to watch
/// the first parent directory that does.
fn watch_file(mut file: &Path) {
while !file.exists()
&& let Some(parent) = file.parent()
{
file = parent;
}
println!("cargo::rerun-if-changed={}", file.display());
}