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#include "fetchers.hh"
#include "cache.hh"
#include "filetransfer.hh"
#include "globals.hh"
#include "store-api.hh"
#include "archive.hh"
#include "tarfile.hh"
#include "types.hh"
namespace nix::fetchers {
DownloadFileResult downloadFile(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable,
const Headers & headers)
{
// FIXME: check store
Attrs inAttrs({
{"type", "file"},
{"url", url},
{"name", name},
});
auto cached = getCache()->lookupExpired(store, inAttrs);
auto useCached = [&]() -> DownloadFileResult
{
return {
.storePath = std::move(cached->storePath),
.etag = getStrAttr(cached->infoAttrs, "etag"),
.effectiveUrl = getStrAttr(cached->infoAttrs, "url")
};
};
if (cached && !cached->expired)
return useCached();
FileTransferRequest request(url);
request.headers = headers;
if (cached)
request.expectedETag = getStrAttr(cached->infoAttrs, "etag");
FileTransferResult res;
try {
res = getFileTransfer()->download(request);
} catch (FileTransferError & e) {
if (cached) {
warn("%s; using cached version", e.msg());
return useCached();
} else
throw;
}
// FIXME: write to temporary file.
Attrs infoAttrs({
{"etag", res.etag},
{"url", res.effectiveUri},
});
std::optional<StorePath> storePath;
if (res.cached) {
assert(cached);
storePath = std::move(cached->storePath);
} else {
StringSink sink;
dumpString(*res.data, sink);
auto hash = hashString(htSHA256, *res.data);
ValidPathInfo info {
*store,
{
.name = name,
.info = FixedOutputInfo {
{
.method = FileIngestionMethod::Flat,
.hash = hash,
},
{},
},
},
hashString(htSHA256, *sink.s),
};
info.narSize = sink.s->size();
auto source = StringSource { *sink.s };
store->addToStore(info, source, NoRepair, NoCheckSigs);
storePath = std::move(info.path);
}
getCache()->add(
store,
inAttrs,
infoAttrs,
*storePath,
immutable);
if (url != res.effectiveUri)
getCache()->add(
store,
{
{"type", "file"},
{"url", res.effectiveUri},
{"name", name},
},
infoAttrs,
*storePath,
immutable);
return {
.storePath = std::move(*storePath),
.etag = res.etag,
.effectiveUrl = res.effectiveUri,
};
}
std::pair<Tree, time_t> downloadTarball(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable,
const Headers & headers)
{
Attrs inAttrs({
{"type", "tarball"},
{"url", url},
{"name", name},
});
auto cached = getCache()->lookupExpired(store, inAttrs);
if (cached && !cached->expired)
return {
Tree(store->toRealPath(cached->storePath), std::move(cached->storePath)),
getIntAttr(cached->infoAttrs, "lastModified")
};
auto res = downloadFile(store, url, name, immutable, headers);
std::optional<StorePath> unpackedStorePath;
time_t lastModified;
if (cached && res.etag != "" && getStrAttr(cached->infoAttrs, "etag") == res.etag) {
unpackedStorePath = std::move(cached->storePath);
lastModified = getIntAttr(cached->infoAttrs, "lastModified");
} else {
Path tmpDir = createTempDir();
AutoDelete autoDelete(tmpDir, true);
unpackTarfile(store->toRealPath(res.storePath), 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;
lastModified = lstat(topDir).st_mtime;
unpackedStorePath = store->addToStore(name, topDir, FileIngestionMethod::Recursive, htSHA256, defaultPathFilter, NoRepair);
}
Attrs infoAttrs({
{"lastModified", uint64_t(lastModified)},
{"etag", res.etag},
});
getCache()->add(
store,
inAttrs,
infoAttrs,
*unpackedStorePath,
immutable);
return {
Tree(store->toRealPath(*unpackedStorePath), std::move(*unpackedStorePath)),
lastModified,
};
}
struct TarballInputScheme : InputScheme
{
std::optional<Input> inputFromURL(const ParsedURL & url) override
{
if (url.scheme != "file" && url.scheme != "http" && url.scheme != "https") return {};
if (!hasSuffix(url.path, ".zip")
&& !hasSuffix(url.path, ".tar")
&& !hasSuffix(url.path, ".tar.gz")
&& !hasSuffix(url.path, ".tar.xz")
&& !hasSuffix(url.path, ".tar.bz2")
&& !hasSuffix(url.path, ".tar.zst"))
return {};
Input input;
input.attrs.insert_or_assign("type", "tarball");
input.attrs.insert_or_assign("url", url.to_string());
auto narHash = url.query.find("narHash");
if (narHash != url.query.end())
input.attrs.insert_or_assign("narHash", narHash->second);
return input;
}
std::optional<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" && name != "name")
throw Error("unsupported tarball input attribute '%s'", name);
Input input;
input.attrs = attrs;
//input.immutable = (bool) maybeGetStrAttr(input.attrs, "hash");
return input;
}
ParsedURL toURL(const Input & input) override
{
auto url = parseURL(getStrAttr(input.attrs, "url"));
// NAR hashes are preferred over file hashes since tar/zip files
// don't have a canonical representation.
if (auto narHash = input.getNarHash())
url.query.insert_or_assign("narHash", narHash->to_string(SRI, true));
/*
else if (auto hash = maybeGetStrAttr(input.attrs, "hash"))
url.query.insert_or_assign("hash", Hash(*hash).to_string(SRI, true));
*/
return url;
}
bool hasAllInfo(const Input & input) override
{
return true;
}
std::pair<Tree, Input> fetch(ref<Store> store, const Input & input) override
{
auto tree = downloadTarball(store, getStrAttr(input.attrs, "url"), input.getName(), false).first;
return {std::move(tree), input};
}
};
static auto rTarballInputScheme = OnStartup([] { registerInputScheme(std::make_unique<TarballInputScheme>()); });
}
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