#[cfg(not(feature = "download"))]
fn main() {}
#[cfg(feature = "download")]
fn main() {
download::download()
}
#[cfg(feature = "download")]
mod download {
use bitcoin_hashes::{sha256, Hash};
use flate2::read::GzDecoder;
use std::fs::File;
use std::io::{BufRead, BufReader, Cursor};
use std::os::unix::fs::PermissionsExt;
use std::path::Path;
use std::str::FromStr;
include!("src/versions.rs");
const GITHUB_URL: &str = "https://github.com/lightningnetwork/lnd/releases/download/";
fn get_expected_sha256(filename: &str) -> Result<sha256::Hash, String> {
let file = File::open("sha256").map_err(|_| "File not found in sha256".to_string())?;
for line in BufReader::new(file).lines().flatten() {
let tokens: Vec<_> = line.split(" ").collect();
if tokens.len() == 2 && filename == tokens[1] {
return sha256::Hash::from_str(tokens[0])
.map_err(|_| "Hash not found in sha256".to_string());
}
}
panic!("File not found in sha256");
}
pub fn download() {
if std::env::var_os("LND_SKIP_DOWNLOAD").is_some() {
return;
}
if !HAS_FEATURE {
return;
}
let download_filename_without_extension = lnd_name();
let download_filename = format!("{}.tar.gz", download_filename_without_extension);
dbg!(&download_filename);
let expected_hash = get_expected_sha256(&download_filename).unwrap();
let out_dir = std::env::var_os("OUT_DIR").unwrap();
let lnd_exe_home = Path::new(&out_dir).join("lnd");
let destination_filename = lnd_exe_home
.join(&download_filename_without_extension);
dbg!(&destination_filename);
if !destination_filename.exists() {
println!(
"filename:{} version:{} hash:{}",
download_filename, VERSION, expected_hash
);
let download_endpoint =
std::env::var("LND_DOWNLOAD_ENDPOINT").unwrap_or(GITHUB_URL.to_string());
let url = format!("{download_endpoint}/{VERSION}/{download_filename}");
let downloaded_bytes = minreq::get(url).send().unwrap().into_bytes();
let downloaded_hash = sha256::Hash::hash(&downloaded_bytes);
assert_eq!(expected_hash, downloaded_hash);
let cursor = Cursor::new(downloaded_bytes);
let mut archive = tar::Archive::new(GzDecoder::new(cursor));
std::fs::create_dir_all(destination_filename.parent().unwrap()).unwrap();
archive.unpack(&lnd_exe_home).unwrap();
std::fs::set_permissions(
&destination_filename,
std::fs::Permissions::from_mode(0o755),
)
.unwrap();
} else {
println!("File already exists");
}
}
}