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Make wasm-builder check before copy/write files if the content is the same (#6149)

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* Make `wasm-builder` check before copy/write files if the content is the
same

* Update utils/wasm-builder/src/lib.rs

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
This commit is contained in:
Bastian Köcher
2020-05-27 00:28:41 +02:00
committed by GitHub
parent 8a7c2c3142
commit 1ea45a541e
2 changed files with 14 additions and 4 deletions
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substrate/utils/wasm-builder/src/lib.rs
+11
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@@ -185,6 +185,17 @@ fn write_file_if_changed(file: PathBuf, content: String) {
}
}
/// Copy `src` to `dst` if the `dst` does not exist or is different.
fn copy_file_if_changed(src: PathBuf, dst: PathBuf) {
let src_file = fs::read_to_string(&src).ok();
let dst_file = fs::read_to_string(&dst).ok();
if src_file != dst_file {
fs::copy(&src, &dst)
.expect(&format!("Copying `{}` to `{}` can not fail; qed", src.display(), dst.display()));
}
}
/// Get a cargo command that compiles with nightly
fn get_nightly_cargo() -> CargoCommand {
let env_cargo = CargoCommand::new(