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pub mod config;
pub use config::Config;
use anyhow::{ensure, Result};
use flate2::bufread::GzDecoder;
use log::info;
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};
use std::{
env,
fs::{File, OpenOptions},
io::{self, prelude::*, BufReader, BufWriter},
path::{Path, PathBuf},
sync::Arc,
};
use tar::Archive;
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CarlaSrc {
pub carla_src_dir: PathBuf,
pub include_dirs: Vec<PathBuf>,
pub lib_dirs: Vec<PathBuf>,
pub libs: Vec<String>,
}
pub(crate) fn load(config: Config) -> Result<PathBuf> {
let out_dir = config.out_dir.clone().unwrap_or_else(|| {
let var = env::var_os("OUT_DIR").expect("OUT_DIR is not set");
PathBuf::from(var)
});
let source_ready_file = out_dir.join("source_ready");
let src_dir = out_dir.join(&config.dir);
println!("cargo:rerun-if-changed={}", out_dir.to_str().unwrap());
skip_or_run(&source_ready_file, || {
prepare_tar_gz(&config.url, &config.sha256sum, &out_dir)?;
ensure!(src_dir.is_dir(), "'{}' does not exist", src_dir.display());
Ok(())
})?;
Ok(src_dir)
}
fn prepare_tar_gz(url: &str, sha256_digest: &[u8], dir: &Path) -> Result<()> {
let tarball_path = dir.join("source.tar.gz");
let is_source_ready = tarball_path.is_file() && sha256_digest == sha256sum(&tarball_path)?;
if is_source_ready {
info!("Source file is ready. Skip downloading.");
} else {
info!("Downloading file from '{}'", url);
let mut tarball_file = OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(&tarball_path)?;
let mut writer = BufWriter::new(&mut tarball_file);
let mut reader = ureq::AgentBuilder::new()
.tls_connector(Arc::new(native_tls::TlsConnector::new()?))
.build()
.get(url)
.call()?
.into_reader();
io::copy(&mut reader, &mut writer)?;
writer.flush()?;
}
{
let digest = sha256sum(&tarball_path)?;
ensure!(
sha256_digest == digest,
"Checksum mismatch: expect {:X?}, but get {:x?}",
sha256_digest,
digest
);
}
{
info!("Unpacking {}", tarball_path.display());
let mut tarball_file = BufReader::new(File::open(&tarball_path)?);
let mut reader = BufReader::new(&mut tarball_file);
let tar = GzDecoder::new(&mut reader);
let mut archive = Archive::new(tar);
archive.unpack(dir)?;
}
Ok(())
}
fn sha256sum(path: &Path) -> Result<[u8; 32]> {
let mut hasher = Sha256::new();
let mut reader = BufReader::new(File::open(path)?);
loop {
let mut buf = [0u8; 8192];
let len = reader.read(&mut buf)?;
if len == 0 {
break;
}
hasher.update(&buf[0..len]);
}
let hash = hasher.finalize();
Ok(hash.as_slice().try_into().unwrap())
}
fn touch(path: &Path) -> Result<()> {
OpenOptions::new().create(true).write(true).open(path)?;
Ok(())
}
fn skip_or_run<T, F>(target_path: &Path, callback: F) -> Result<Option<T>>
where
F: FnOnce() -> Result<T>,
{
with_target(target_path, || {
let output = (callback)()?;
touch(target_path)?;
Ok(output)
})
}
fn with_target<T, F>(target_path: &Path, callback: F) -> Result<Option<T>>
where
F: FnOnce() -> Result<T>,
{
with_targets(&[target_path], callback)
}
fn with_targets<T, F>(target_paths: &[&Path], callback: F) -> Result<Option<T>>
where
F: FnOnce() -> Result<T>,
{
let ok = target_paths.iter().all(|path| path.exists());
if ok {
return Ok(None);
}
(callback)().map(Some)
}