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|
use anyhow::Context;
use cargo_util::Sha256;
use crate::core::PackageId;
use crate::sources::registry::make_dep_prefix;
use crate::sources::registry::MaybeLock;
use crate::sources::registry::{
RegistryConfig, CHECKSUM_TEMPLATE, CRATE_TEMPLATE, LOWER_PREFIX_TEMPLATE, PREFIX_TEMPLATE,
VERSION_TEMPLATE,
};
use crate::util::auth;
use crate::util::errors::CargoResult;
use crate::util::{Config, Filesystem};
use std::fmt::Write as FmtWrite;
use std::fs::{self, File, OpenOptions};
use std::io::prelude::*;
use std::io::SeekFrom;
use std::str;
pub(super) fn filename(pkg: PackageId) -> String {
format!("{}-{}.crate", pkg.name(), pkg.version())
}
pub(super) fn download(
cache_path: &Filesystem,
config: &Config,
pkg: PackageId,
checksum: &str,
registry_config: RegistryConfig,
) -> CargoResult<MaybeLock> {
let filename = filename(pkg);
let path = cache_path.join(&filename);
let path = config.assert_package_cache_locked(&path);
// Attempt to open a read-only copy first to avoid an exclusive write
// lock and also work with read-only filesystems. Note that we check the
// length of the file like below to handle interrupted downloads.
//
// If this fails then we fall through to the exclusive path where we may
// have to redownload the file.
if let Ok(dst) = File::open(path) {
let meta = dst.metadata()?;
if meta.len() > 0 {
return Ok(MaybeLock::Ready(dst));
}
}
let mut url = registry_config.dl;
if !url.contains(CRATE_TEMPLATE)
&& !url.contains(VERSION_TEMPLATE)
&& !url.contains(PREFIX_TEMPLATE)
&& !url.contains(LOWER_PREFIX_TEMPLATE)
&& !url.contains(CHECKSUM_TEMPLATE)
{
// Original format before customizing the download URL was supported.
write!(
url,
"/{}/{}/download",
pkg.name(),
pkg.version().to_string()
)
.unwrap();
} else {
let prefix = make_dep_prefix(&*pkg.name());
url = url
.replace(CRATE_TEMPLATE, &*pkg.name())
.replace(VERSION_TEMPLATE, &pkg.version().to_string())
.replace(PREFIX_TEMPLATE, &prefix)
.replace(LOWER_PREFIX_TEMPLATE, &prefix.to_lowercase())
.replace(CHECKSUM_TEMPLATE, checksum);
}
let authorization = if registry_config.auth_required {
Some(auth::auth_token(config, &pkg.source_id(), None, None)?)
} else {
None
};
Ok(MaybeLock::Download {
url,
descriptor: pkg.to_string(),
authorization: authorization,
})
}
pub(super) fn finish_download(
cache_path: &Filesystem,
config: &Config,
pkg: PackageId,
checksum: &str,
data: &[u8],
) -> CargoResult<File> {
// Verify what we just downloaded
let actual = Sha256::new().update(data).finish_hex();
if actual != checksum {
anyhow::bail!("failed to verify the checksum of `{}`", pkg)
}
let filename = filename(pkg);
cache_path.create_dir()?;
let path = cache_path.join(&filename);
let path = config.assert_package_cache_locked(&path);
let mut dst = OpenOptions::new()
.create(true)
.read(true)
.write(true)
.open(&path)
.with_context(|| format!("failed to open `{}`", path.display()))?;
let meta = dst.metadata()?;
if meta.len() > 0 {
return Ok(dst);
}
dst.write_all(data)?;
dst.seek(SeekFrom::Start(0))?;
Ok(dst)
}
pub(super) fn is_crate_downloaded(
cache_path: &Filesystem,
config: &Config,
pkg: PackageId,
) -> bool {
let path = cache_path.join(filename(pkg));
let path = config.assert_package_cache_locked(&path);
if let Ok(meta) = fs::metadata(path) {
return meta.len() > 0;
}
false
}
|
