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#include "fetchers/fetchers.hh"
#include "fetchers/parse.hh"
#include "fetchers/cache.hh"
#include "download.hh"
#include "globals.hh"
#include "store-api.hh"
#include "archive.hh"
#include "tarfile.hh"
namespace nix::fetchers {
StorePath downloadFile(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable)
{
// FIXME: check store
Attrs inAttrs({
{"type", "file"},
{"url", url},
{"name", name},
});
if (auto res = getCache()->lookup(store, inAttrs))
return std::move(res->second);
// FIXME: use ETag.
DownloadRequest request(url);
auto res = getDownloader()->download(request);
// FIXME: write to temporary file.
StringSink sink;
dumpString(*res.data, sink);
auto hash = hashString(htSHA256, *res.data);
ValidPathInfo info(store->makeFixedOutputPath(false, hash, name));
info.narHash = hashString(htSHA256, *sink.s);
info.narSize = sink.s->size();
info.ca = makeFixedOutputCA(false, hash);
store->addToStore(info, sink.s, NoRepair, NoCheckSigs);
Attrs infoAttrs({
{"etag", res.etag},
});
getCache()->add(
store,
inAttrs,
infoAttrs,
info.path.clone(),
immutable);
return std::move(info.path);
}
Tree downloadTarball(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable)
{
Attrs inAttrs({
{"type", "tarball"},
{"url", url},
{"name", name},
});
if (auto res = getCache()->lookup(store, inAttrs))
return Tree {
.actualPath = store->toRealPath(res->second),
.storePath = std::move(res->second),
.info = TreeInfo {
.lastModified = getIntAttr(res->first, "lastModified"),
},
};
auto tarball = downloadFile(store, url, name, immutable);
Path tmpDir = createTempDir();
AutoDelete autoDelete(tmpDir, true);
unpackTarfile(store->toRealPath(tarball), tmpDir);
auto members = readDirectory(tmpDir);
if (members.size() != 1)
throw nix::Error("tarball '%s' contains an unexpected number of top-level files", url);
auto topDir = tmpDir + "/" + members.begin()->name;
auto lastModified = lstat(topDir).st_mtime;
auto unpackedStorePath = store->addToStore(name, topDir, true, htSHA256, defaultPathFilter, NoRepair);
Attrs infoAttrs({
{"lastModified", lastModified},
});
getCache()->add(
store,
inAttrs,
infoAttrs,
unpackedStorePath,
immutable);
return Tree {
.actualPath = store->toRealPath(unpackedStorePath),
.storePath = std::move(unpackedStorePath),
.info = TreeInfo {
.lastModified = lastModified,
},
};
}
struct TarballInput : Input
{
ParsedURL url;
std::optional<Hash> hash;
TarballInput(const ParsedURL & url) : url(url)
{ }
std::string type() const override { return "tarball"; }
bool operator ==(const Input & other) const override
{
auto other2 = dynamic_cast<const TarballInput *>(&other);
return
other2
&& to_string() == other2->to_string()
&& hash == other2->hash;
}
bool isImmutable() const override
{
return hash || narHash;
}
std::string to_string() const override
{
auto url2(url);
// NAR hashes are preferred over file hashes since tar/zip files
// don't have a canonical representation.
if (narHash)
url2.query.insert_or_assign("narHash", narHash->to_string(SRI));
else if (hash)
url2.query.insert_or_assign("hash", hash->to_string(SRI));
return url2.to_string();
}
Attrs toAttrsInternal() const override
{
Attrs attrs;
attrs.emplace("url", url.to_string());
if (narHash)
attrs.emplace("narHash", hash->to_string(SRI));
else if (hash)
attrs.emplace("hash", hash->to_string(SRI));
return attrs;
}
std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
{
auto tree = downloadTarball(store, url.to_string(), "source", false);
auto input = std::make_shared<TarballInput>(*this);
input->narHash = store->queryPathInfo(tree.storePath)->narHash;
return {std::move(tree), input};
}
};
struct TarballInputScheme : InputScheme
{
std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
{
if (url.scheme != "file" && url.scheme != "http" && url.scheme != "https") return nullptr;
if (!hasSuffix(url.path, ".zip")
&& !hasSuffix(url.path, ".tar")
&& !hasSuffix(url.path, ".tar.gz")
&& !hasSuffix(url.path, ".tar.xz")
&& !hasSuffix(url.path, ".tar.bz2"))
return nullptr;
auto input = std::make_unique<TarballInput>(url);
auto hash = input->url.query.find("hash");
if (hash != input->url.query.end()) {
// FIXME: require SRI hash.
input->hash = Hash(hash->second);
input->url.query.erase(hash);
}
auto narHash = input->url.query.find("narHash");
if (narHash != input->url.query.end()) {
// FIXME: require SRI hash.
input->narHash = Hash(narHash->second);
input->url.query.erase(narHash);
}
return input;
}
std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
{
if (maybeGetStrAttr(attrs, "type") != "tarball") return {};
for (auto & [name, value] : attrs)
if (name != "type" && name != "url" && name != "hash" && name != "narHash")
throw Error("unsupported tarball input attribute '%s'", name);
auto input = std::make_unique<TarballInput>(parseURL(getStrAttr(attrs, "url")));
if (auto hash = maybeGetStrAttr(attrs, "hash"))
// FIXME: require SRI hash.
input->hash = Hash(*hash);
return input;
}
};
static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<TarballInputScheme>()); });
}
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