68 lines
2.0 KiB
Rust
68 lines
2.0 KiB
Rust
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// TODO: Use ExitCode::exit_ok() when stable.
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use std::{process::Command, fs::canonicalize, path::{Path, PathBuf, Component}};
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use color_eyre::eyre::{Result, eyre};
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const ZKEY_FILE: &str = "./semaphore/build/snark/semaphore_final.zkey";
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const WASM_FILE: &str = "./semaphore/build/snark/semaphore.wasm";
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const DYLIB_FILE: &str = "./semaphore/build/snark/semaphore.dylib";
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// See <https://internals.rust-lang.org/t/path-to-lexical-absolute/14940>
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fn absolute(path: &str) -> Result<PathBuf> {
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let path = Path::new(path);
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let mut absolute = if path.is_absolute() {
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PathBuf::new()
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} else {
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std::env::current_dir()?
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};
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for component in path.components() {
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match component {
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Component::CurDir => {},
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Component::ParentDir => { absolute.pop(); },
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component @ _ => absolute.push(component.as_os_str()),
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}
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}
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Ok(absolute)
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}
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fn build_circuit() -> Result<()> {
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println!("cargo:rerun-if-changed=./semaphore");
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let run = |cmd: &[&str]| -> Result<()> {
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Command::new(cmd[0])
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.args(cmd[1..].iter())
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.current_dir("./semaphore")
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.status()?
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.success()
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.then(|| ())
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.ok_or(eyre!("procees returned failure"))?;
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Ok(())
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};
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// Compute absolute paths
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let zkey_file = absolute(ZKEY_FILE)?;
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let wasm_file = absolute(WASM_FILE)?;
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// Build circuits if not exists
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// TODO: This does not rebuild if the semaphore submodule is changed.
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// NOTE: This requires npm / nodejs to be installed.
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if !(zkey_file.exists() && wasm_file.exists()) {
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run(&["npm", "install"])?;
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run(&["npm", "exec", "ts-node", "./scripts/compile-circuits.ts"])?;
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}
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assert!(zkey_file.exists());
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assert!(wasm_file.exists());
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// Export generated paths
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println!("cargo:rustc-env=ZKEY_FILE={}", zkey_file.display());
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println!("cargo:rustc-env=WASM_FILE={}", wasm_file.display());
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Ok(())
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}
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fn main() -> Result<()> {
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build_circuit()?;
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Ok(())
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}
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