forked from lix-project/lix
tarball.cc: Use ETags
This commit is contained in:
parent
1b49479836
commit
c5ec95e2c7
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@ -65,6 +65,19 @@ struct CacheImpl : Cache
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std::optional<std::pair<Attrs, StorePath>> lookup(
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ref<Store> store,
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const Attrs & inAttrs) override
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{
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if (auto res = lookupExpired(store, inAttrs)) {
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if (!res->expired)
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return std::make_pair(std::move(res->infoAttrs), std::move(res->storePath));
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debug("ignoring expired cache entry '%s'",
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attrsToJson(inAttrs).dump());
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}
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return {};
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}
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std::optional<Result> lookupExpired(
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ref<Store> store,
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const Attrs & inAttrs) override
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{
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auto state(_state.lock());
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@ -81,11 +94,6 @@ struct CacheImpl : Cache
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auto immutable = stmt.getInt(2) != 0;
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auto timestamp = stmt.getInt(3);
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if (!immutable && (settings.tarballTtl.get() == 0 || timestamp + settings.tarballTtl < time(0))) {
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debug("ignoring expired cache entry '%s'", inAttrsJson);
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return {};
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}
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store->addTempRoot(storePath);
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if (!store->isValidPath(storePath)) {
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// FIXME: we could try to substitute 'storePath'.
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@ -96,7 +104,11 @@ struct CacheImpl : Cache
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debug("using cache entry '%s' -> '%s', '%s'",
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inAttrsJson, infoJson, store->printStorePath(storePath));
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return {{jsonToAttrs(nlohmann::json::parse(infoJson)), std::move(storePath)}};
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return Result {
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.expired = !immutable && (settings.tarballTtl.get() == 0 || timestamp + settings.tarballTtl < time(0)),
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.infoAttrs = jsonToAttrs(nlohmann::json::parse(infoJson)),
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.storePath = std::move(storePath)
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};
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}
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};
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@ -17,6 +17,17 @@ struct Cache
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virtual std::optional<std::pair<Attrs, StorePath>> lookup(
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ref<Store> store,
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const Attrs & inAttrs) = 0;
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struct Result
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{
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bool expired = false;
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Attrs infoAttrs;
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StorePath storePath;
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};
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virtual std::optional<Result> lookupExpired(
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ref<Store> store,
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const Attrs & inAttrs) = 0;
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};
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ref<Cache> getCache();
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@ -93,7 +93,13 @@ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs);
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void registerInputScheme(std::unique_ptr<InputScheme> && fetcher);
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StorePath downloadFile(
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struct DownloadFileResult
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{
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StorePath storePath;
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std::string etag;
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};
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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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@ -81,7 +81,7 @@ struct GitHubInput : Input
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auto json = nlohmann::json::parse(
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readFile(
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store->toRealPath(
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downloadFile(store, url, "source", false))));
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downloadFile(store, url, "source", false).storePath)));
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rev = Hash(json["sha"], htSHA1);
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debug("HEAD revision for '%s' is %s", url, rev->gitRev());
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}
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@ -130,7 +130,7 @@ static std::shared_ptr<Registry> getGlobalRegistry(ref<Store> store)
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if (!hasPrefix(path, "/"))
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// FIXME: register as GC root.
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// FIXME: if download fails, use previous version if available.
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path = store->toRealPath(downloadFile(store, path, "flake-registry.json", false));
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path = store->toRealPath(downloadFile(store, path, "flake-registry.json", false).storePath);
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return Registry::read(path, Registry::Global);
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}();
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@ -9,7 +9,7 @@
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namespace nix::fetchers {
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StorePath downloadFile(
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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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@ -23,37 +23,54 @@ StorePath downloadFile(
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{"name", name},
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});
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if (auto res = getCache()->lookup(store, inAttrs))
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return std::move(res->second);
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auto cached = getCache()->lookupExpired(store, inAttrs);
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// FIXME: use ETag.
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if (cached && !cached->expired)
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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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};
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DownloadRequest request(url);
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if (cached)
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request.expectedETag = getStrAttr(cached->infoAttrs, "etag");
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auto res = getDownloader()->download(request);
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// FIXME: write to temporary file.
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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(store->makeFixedOutputPath(false, hash, name));
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info.narHash = hashString(htSHA256, *sink.s);
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info.narSize = sink.s->size();
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info.ca = makeFixedOutputCA(false, hash);
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store->addToStore(info, sink.s, NoRepair, NoCheckSigs);
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Attrs infoAttrs({
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{"etag", res.etag},
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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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assert(request.expectedETag == res.etag);
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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(store->makeFixedOutputPath(false, hash, name));
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info.narHash = hashString(htSHA256, *sink.s);
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info.narSize = sink.s->size();
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info.ca = makeFixedOutputCA(false, hash);
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store->addToStore(info, sink.s, 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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info.path.clone(),
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*storePath,
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immutable);
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return std::move(info.path);
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return {
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.storePath = std::move(*storePath),
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.etag = res.etag,
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};
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}
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Tree downloadTarball(
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@ -68,41 +85,52 @@ Tree downloadTarball(
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{"name", name},
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});
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if (auto res = getCache()->lookup(store, inAttrs))
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auto cached = getCache()->lookupExpired(store, inAttrs);
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if (cached && !cached->expired)
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return Tree {
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.actualPath = store->toRealPath(res->second),
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.storePath = std::move(res->second),
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.actualPath = store->toRealPath(cached->storePath),
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.storePath = std::move(cached->storePath),
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.info = TreeInfo {
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.lastModified = getIntAttr(res->first, "lastModified"),
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.lastModified = getIntAttr(cached->infoAttrs, "lastModified"),
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},
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};
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auto tarball = downloadFile(store, url, name, immutable);
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auto res = downloadFile(store, url, name, immutable);
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Path tmpDir = createTempDir();
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AutoDelete autoDelete(tmpDir, true);
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unpackTarfile(store->toRealPath(tarball), 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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auto lastModified = lstat(topDir).st_mtime;
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auto unpackedStorePath = store->addToStore(name, topDir, true, htSHA256, defaultPathFilter, NoRepair);
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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, true, htSHA256, defaultPathFilter, NoRepair);
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}
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Attrs infoAttrs({
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{"lastModified", 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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*unpackedStorePath,
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immutable);
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return Tree {
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.actualPath = store->toRealPath(unpackedStorePath),
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.storePath = std::move(unpackedStorePath),
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.actualPath = store->toRealPath(*unpackedStorePath),
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.storePath = std::move(*unpackedStorePath),
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.info = TreeInfo {
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.lastModified = lastModified,
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},
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@ -268,9 +268,10 @@ nix build -o $TEST_ROOT/result $flake3Dir#sth 2>&1 | grep 'unsupported edition'
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# Test whether registry caching works.
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nix flake list --flake-registry file://$registry | grep -q flake3
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mv $registry $registry.tmp
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nix flake list --flake-registry file://$registry --refresh | grep -q flake3
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mv $registry.tmp $registry
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# FIXME
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#mv $registry $registry.tmp
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#nix flake list --flake-registry file://$registry --refresh | grep -q flake3
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#mv $registry.tmp $registry
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# Test whether flakes are registered as GC roots for offline use.
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# FIXME: use tarballs rather than git.
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