lighthouse/common/eth2_network_config/build.rs

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//! Extracts zipped genesis states on first run.
use eth2_config::{mainnet, prater, pyrmont, Eth2NetArchiveAndDirectory, GENESIS_FILE_NAME};
use std::fs::File;
use std::io;
use zip::ZipArchive;
const ETH2_NET_DIRS: &[Eth2NetArchiveAndDirectory<'static>] = &[
mainnet::ETH2_NET_DIR,
pyrmont::ETH2_NET_DIR,
prater::ETH2_NET_DIR,
];
fn main() {
for network in ETH2_NET_DIRS {
match uncompress_state(network) {
Ok(()) => (),
Err(e) => panic!(
"Failed to uncompress {} genesis state zip file: {}",
network.name, e
),
}
}
}
/// Uncompress the network configs archive into a network configs folder.
fn uncompress_state(network: &Eth2NetArchiveAndDirectory<'static>) -> Result<(), String> {
let genesis_ssz_path = network.dir().join(GENESIS_FILE_NAME);
// Take care to not overwrite the genesis.ssz if it already exists, as that causes
// spurious rebuilds.
if genesis_ssz_path.exists() {
return Ok(());
}
if network.genesis_is_known {
// Extract genesis state from genesis.ssz.zip
let archive_path = network.genesis_state_archive();
let archive_file = File::open(&archive_path)
.map_err(|e| format!("Failed to open archive file {:?}: {:?}", archive_path, e))?;
let mut archive =
ZipArchive::new(archive_file).map_err(|e| format!("Error with zip file: {}", e))?;
let mut file = archive.by_name(GENESIS_FILE_NAME).map_err(|e| {
format!(
"Error retrieving file {} inside zip: {}",
GENESIS_FILE_NAME, e
)
})?;
let mut outfile = File::create(&genesis_ssz_path)
.map_err(|e| format!("Error while creating file {:?}: {}", genesis_ssz_path, e))?;
io::copy(&mut file, &mut outfile)
.map_err(|e| format!("Error writing file {:?}: {}", genesis_ssz_path, e))?;
} else {
// Create empty genesis.ssz if genesis is unknown
File::create(genesis_ssz_path)
.map_err(|e| format!("Failed to create {}: {}", GENESIS_FILE_NAME, e))?;
}
Ok(())
}