46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
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//! This build script calculates the hash of all files in the `src/`
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//! directory and adds it as an environment variable during build time.
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//!
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//! This is used so that the python code can detect when the built native module
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//! does not match the source in-tree, helping to detect the case where the
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//! source has been updated but the library hasn't been rebuilt.
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use std::path::PathBuf;
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use blake2::{Blake2b512, Digest};
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fn main() -> Result<(), std::io::Error> {
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let mut dirs = vec![PathBuf::from("src")];
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let mut paths = Vec::new();
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while let Some(path) = dirs.pop() {
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let mut entries = std::fs::read_dir(path)?
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.map(|res| res.map(|e| e.path()))
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.collect::<Result<Vec<_>, std::io::Error>>()?;
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entries.sort();
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for entry in entries {
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if entry.is_dir() {
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dirs.push(entry)
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} else {
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paths.push(entry.to_str().expect("valid rust paths").to_string());
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}
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}
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}
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paths.sort();
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let mut hasher = Blake2b512::new();
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for path in paths {
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let bytes = std::fs::read(path)?;
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hasher.update(bytes);
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}
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let hex_digest = hex::encode(hasher.finalize());
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println!("cargo:rustc-env=SYNAPSE_RUST_DIGEST={hex_digest}");
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Ok(())
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}
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