forked from lix-project/lix
238 lines
6.9 KiB
C++
238 lines
6.9 KiB
C++
#include "fetchers.hh"
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#include "cache.hh"
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#include "filetransfer.hh"
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#include "globals.hh"
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#include "store-api.hh"
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#include "archive.hh"
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#include "tarfile.hh"
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#include "types.hh"
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namespace nix::fetchers {
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DownloadFileResult downloadFile(
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ref<Store> store,
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const std::string & url,
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const std::string & name,
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bool immutable,
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const Headers & headers)
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{
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// FIXME: check store
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Attrs inAttrs({
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{"type", "file"},
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{"url", url},
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{"name", name},
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});
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auto cached = getCache()->lookupExpired(store, inAttrs);
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auto useCached = [&]() -> DownloadFileResult
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{
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return {
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.storePath = std::move(cached->storePath),
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.etag = getStrAttr(cached->infoAttrs, "etag"),
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.effectiveUrl = getStrAttr(cached->infoAttrs, "url")
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};
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};
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if (cached && !cached->expired)
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return useCached();
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FileTransferRequest request(url);
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request.headers = headers;
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if (cached)
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request.expectedETag = getStrAttr(cached->infoAttrs, "etag");
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FileTransferResult res;
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try {
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res = getFileTransfer()->download(request);
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} catch (FileTransferError & e) {
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if (cached) {
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warn("%s; using cached version", e.msg());
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return useCached();
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} else
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throw;
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}
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// FIXME: write to temporary file.
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Attrs infoAttrs({
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{"etag", res.etag},
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{"url", res.effectiveUri},
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});
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std::optional<StorePath> storePath;
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if (res.cached) {
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assert(cached);
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storePath = std::move(cached->storePath);
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} else {
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StringSink sink;
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dumpString(res.data, sink);
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auto hash = hashString(htSHA256, res.data);
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ValidPathInfo info {
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store->makeFixedOutputPath(FileIngestionMethod::Flat, hash, name),
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hashString(htSHA256, sink.s),
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};
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info.narSize = sink.s.size();
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info.ca = FixedOutputHash {
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.method = FileIngestionMethod::Flat,
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.hash = hash,
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};
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auto source = StringSource(sink.s);
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store->addToStore(info, source, NoRepair, NoCheckSigs);
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storePath = std::move(info.path);
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}
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getCache()->add(
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store,
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inAttrs,
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infoAttrs,
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*storePath,
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immutable);
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if (url != res.effectiveUri)
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getCache()->add(
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store,
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{
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{"type", "file"},
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{"url", res.effectiveUri},
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{"name", name},
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},
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infoAttrs,
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*storePath,
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immutable);
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return {
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.storePath = std::move(*storePath),
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.etag = res.etag,
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.effectiveUrl = res.effectiveUri,
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};
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}
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std::pair<Tree, time_t> downloadTarball(
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ref<Store> store,
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const std::string & url,
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const std::string & name,
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bool immutable,
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const Headers & headers)
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{
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Attrs inAttrs({
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{"type", "tarball"},
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{"url", url},
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{"name", name},
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});
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auto cached = getCache()->lookupExpired(store, inAttrs);
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if (cached && !cached->expired)
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return {
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Tree { .actualPath = store->toRealPath(cached->storePath), .storePath = std::move(cached->storePath) },
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getIntAttr(cached->infoAttrs, "lastModified")
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};
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auto res = downloadFile(store, url, name, immutable, headers);
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std::optional<StorePath> unpackedStorePath;
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time_t lastModified;
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if (cached && res.etag != "" && getStrAttr(cached->infoAttrs, "etag") == res.etag) {
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unpackedStorePath = std::move(cached->storePath);
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lastModified = getIntAttr(cached->infoAttrs, "lastModified");
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} else {
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Path tmpDir = createTempDir();
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AutoDelete autoDelete(tmpDir, true);
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unpackTarfile(store->toRealPath(res.storePath), tmpDir);
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auto members = readDirectory(tmpDir);
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if (members.size() != 1)
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throw nix::Error("tarball '%s' contains an unexpected number of top-level files", url);
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auto topDir = tmpDir + "/" + members.begin()->name;
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lastModified = lstat(topDir).st_mtime;
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unpackedStorePath = store->addToStore(name, topDir, FileIngestionMethod::Recursive, htSHA256, defaultPathFilter, NoRepair);
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}
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Attrs infoAttrs({
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{"lastModified", uint64_t(lastModified)},
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{"etag", res.etag},
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});
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getCache()->add(
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store,
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inAttrs,
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infoAttrs,
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*unpackedStorePath,
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immutable);
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return {
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Tree { .actualPath = store->toRealPath(*unpackedStorePath), .storePath = std::move(*unpackedStorePath) },
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lastModified,
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};
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}
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struct TarballInputScheme : InputScheme
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{
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std::optional<Input> inputFromURL(const ParsedURL & url) override
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{
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if (url.scheme != "file" && url.scheme != "http" && url.scheme != "https") return {};
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if (!hasSuffix(url.path, ".zip")
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&& !hasSuffix(url.path, ".tar")
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&& !hasSuffix(url.path, ".tgz")
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&& !hasSuffix(url.path, ".tar.gz")
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&& !hasSuffix(url.path, ".tar.xz")
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&& !hasSuffix(url.path, ".tar.bz2")
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&& !hasSuffix(url.path, ".tar.zst"))
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return {};
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Input input;
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input.attrs.insert_or_assign("type", "tarball");
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input.attrs.insert_or_assign("url", url.to_string());
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auto narHash = url.query.find("narHash");
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if (narHash != url.query.end())
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input.attrs.insert_or_assign("narHash", narHash->second);
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return input;
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}
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std::optional<Input> inputFromAttrs(const Attrs & attrs) override
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{
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if (maybeGetStrAttr(attrs, "type") != "tarball") return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "url" && /* name != "hash" && */ name != "narHash" && name != "name")
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throw Error("unsupported tarball input attribute '%s'", name);
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Input input;
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input.attrs = attrs;
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//input.immutable = (bool) maybeGetStrAttr(input.attrs, "hash");
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return input;
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}
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ParsedURL toURL(const Input & input) override
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{
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auto url = parseURL(getStrAttr(input.attrs, "url"));
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// NAR hashes are preferred over file hashes since tar/zip files
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// don't have a canonical representation.
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if (auto narHash = input.getNarHash())
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url.query.insert_or_assign("narHash", narHash->to_string(SRI, true));
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/*
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else if (auto hash = maybeGetStrAttr(input.attrs, "hash"))
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url.query.insert_or_assign("hash", Hash(*hash).to_string(SRI, true));
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*/
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return url;
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}
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bool hasAllInfo(const Input & input) override
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{
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return true;
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}
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std::pair<StorePath, Input> fetch(ref<Store> store, const Input & input) override
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{
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auto tree = downloadTarball(store, getStrAttr(input.attrs, "url"), input.getName(), false).first;
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return {std::move(tree.storePath), input};
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}
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};
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static auto rTarballInputScheme = OnStartup([] { registerInputScheme(std::make_unique<TarballInputScheme>()); });
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}
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