DataTransfer -> FileTransfer

src/libstore/build.cc

@@ -361,7 +361,7 @@ public:
     {
         actDerivations.progress(doneBuilds, expectedBuilds + doneBuilds, runningBuilds, failedBuilds);
         actSubstitutions.progress(doneSubstitutions, expectedSubstitutions + doneSubstitutions, runningSubstitutions, failedSubstitutions);
-        act.setExpected(actDataTransfer, expectedDownloadSize + doneDownloadSize);
+        act.setExpected(actFileTransfer, expectedDownloadSize + doneDownloadSize);
         act.setExpected(actCopyPath, expectedNarSize + doneNarSize);
     }
 };

src/libstore/builtins/fetchurl.cc

@@ -26,9 +26,9 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
     auto mainUrl = getAttr("url");
     bool unpack = get(drv.env, "unpack").value_or("") == "1";
 
-    /* Note: have to use a fresh dataTransfer here because we're in
+    /* Note: have to use a fresh fileTransfer here because we're in
        a forked process. */
-    auto dataTransfer = makeDataTransfer();
+    auto fileTransfer = makeFileTransfer();
 
     auto fetch = [&](const std::string & url) {
 
@@ -36,13 +36,13 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
 
             /* No need to do TLS verification, because we check the hash of
                the result anyway. */
-            DataTransferRequest request(url);
+            FileTransferRequest request(url);
             request.verifyTLS = false;
             request.decompress = false;
 
             auto decompressor = makeDecompressionSink(
                 unpack && hasSuffix(mainUrl, ".xz") ? "xz" : "none", sink);
-            dataTransfer->download(std::move(request), *decompressor);
+            fileTransfer->download(std::move(request), *decompressor);
             decompressor->finish();
         });
 

src/libstore/datatransfer.cc

@@ -27,9 +27,9 @@ using namespace std::string_literals;
 
 namespace nix {
 
-DataTransferSettings dataTransferSettings;
+FileTransferSettings fileTransferSettings;
 
-static GlobalConfig::Register r1(&dataTransferSettings);
+static GlobalConfig::Register r1(&fileTransferSettings);
 
 std::string resolveUri(const std::string & uri)
 {
@@ -39,7 +39,7 @@ std::string resolveUri(const std::string & uri)
         return uri;
 }
 
-struct curlDataTransfer : public DataTransfer
+struct curlFileTransfer : public FileTransfer
 {
     CURLM * curlm = 0;
 
@@ -48,12 +48,12 @@ struct curlDataTransfer : public DataTransfer
 
     struct TransferItem : public std::enable_shared_from_this<TransferItem>
     {
-        curlDataTransfer & dataTransfer;
+        curlFileTransfer & fileTransfer;
-        DataTransferRequest request;
+        FileTransferRequest request;
-        DataTransferResult result;
+        FileTransferResult result;
         Activity act;
         bool done = false; // whether either the success or failure function has been called
-        Callback<DataTransferResult> callback;
+        Callback<FileTransferResult> callback;
         CURL * req = 0;
         bool active = false; // whether the handle has been added to the multi object
         std::string status;
@@ -72,12 +72,12 @@ struct curlDataTransfer : public DataTransfer
 
         curl_off_t writtenToSink = 0;
 
-        TransferItem(curlDataTransfer & dataTransfer,
+        TransferItem(curlFileTransfer & fileTransfer,
-            const DataTransferRequest & request,
+            const FileTransferRequest & request,
-            Callback<DataTransferResult> && callback)
+            Callback<FileTransferResult> && callback)
-            : dataTransfer(dataTransfer)
+            : fileTransfer(fileTransfer)
             , request(request)
-            , act(*logger, lvlTalkative, actDataTransfer,
+            , act(*logger, lvlTalkative, actFileTransfer,
                 fmt(request.data ? "uploading '%s'" : "downloading '%s'", request.uri),
                 {request.uri}, request.parentAct)
             , callback(std::move(callback))
@@ -106,13 +106,13 @@ struct curlDataTransfer : public DataTransfer
         {
             if (req) {
                 if (active)
-                    curl_multi_remove_handle(dataTransfer.curlm, req);
+                    curl_multi_remove_handle(fileTransfer.curlm, req);
                 curl_easy_cleanup(req);
             }
             if (requestHeaders) curl_slist_free_all(requestHeaders);
             try {
                 if (!done)
-                    fail(DataTransferError(Interrupted, format("download of '%s' was interrupted") % request.uri));
+                    fail(FileTransferError(Interrupted, format("download of '%s' was interrupted") % request.uri));
             } catch (...) {
                 ignoreException();
             }
@@ -257,12 +257,12 @@ struct curlDataTransfer : public DataTransfer
             curl_easy_setopt(req, CURLOPT_NOSIGNAL, 1);
             curl_easy_setopt(req, CURLOPT_USERAGENT,
                 ("curl/" LIBCURL_VERSION " Nix/" + nixVersion +
-                    (dataTransferSettings.userAgentSuffix != "" ? " " + dataTransferSettings.userAgentSuffix.get() : "")).c_str());
+                    (fileTransferSettings.userAgentSuffix != "" ? " " + fileTransferSettings.userAgentSuffix.get() : "")).c_str());
             #if LIBCURL_VERSION_NUM >= 0x072b00
             curl_easy_setopt(req, CURLOPT_PIPEWAIT, 1);
             #endif
             #if LIBCURL_VERSION_NUM >= 0x072f00
-            if (dataTransferSettings.enableHttp2)
+            if (fileTransferSettings.enableHttp2)
                 curl_easy_setopt(req, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2TLS);
             else
                 curl_easy_setopt(req, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
@@ -297,10 +297,10 @@ struct curlDataTransfer : public DataTransfer
                 curl_easy_setopt(req, CURLOPT_SSL_VERIFYHOST, 0);
             }
 
-            curl_easy_setopt(req, CURLOPT_CONNECTTIMEOUT, dataTransferSettings.connectTimeout.get());
+            curl_easy_setopt(req, CURLOPT_CONNECTTIMEOUT, fileTransferSettings.connectTimeout.get());
 
             curl_easy_setopt(req, CURLOPT_LOW_SPEED_LIMIT, 1L);
-            curl_easy_setopt(req, CURLOPT_LOW_SPEED_TIME, dataTransferSettings.stalledDownloadTimeout.get());
+            curl_easy_setopt(req, CURLOPT_LOW_SPEED_TIME, fileTransferSettings.stalledDownloadTimeout.get());
 
             /* If no file exist in the specified path, curl continues to work
                anyway as if netrc support was disabled. */
@@ -401,14 +401,14 @@ struct curlDataTransfer : public DataTransfer
 
                 auto exc =
                     code == CURLE_ABORTED_BY_CALLBACK && _isInterrupted
-                    ? DataTransferError(Interrupted, fmt("%s of '%s' was interrupted", request.verb(), request.uri))
+                    ? FileTransferError(Interrupted, fmt("%s of '%s' was interrupted", request.verb(), request.uri))
                     : httpStatus != 0
-                    ? DataTransferError(err,
+                    ? FileTransferError(err,
                         fmt("unable to %s '%s': HTTP error %d",
                             request.verb(), request.uri, httpStatus)
                         + (code == CURLE_OK ? "" : fmt(" (curl error: %s)", curl_easy_strerror(code)))
                         )
-                    : DataTransferError(err,
+                    : FileTransferError(err,
                         fmt("unable to %s '%s': %s (%d)",
                             request.verb(), request.uri, curl_easy_strerror(code), code));
 
@@ -422,13 +422,13 @@ struct curlDataTransfer : public DataTransfer
                         || writtenToSink == 0
                         || (acceptRanges && encoding.empty())))
                 {
-                    int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(dataTransfer.mt19937));
+                    int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));
                     if (writtenToSink)
                         warn("%s; retrying from offset %d in %d ms", exc.what(), writtenToSink, ms);
                     else
                         warn("%s; retrying in %d ms", exc.what(), ms);
                     embargo = std::chrono::steady_clock::now() + std::chrono::milliseconds(ms);
-                    dataTransfer.enqueueItem(shared_from_this());
+                    fileTransfer.enqueueItem(shared_from_this());
                 }
                 else
                     fail(exc);
@@ -456,7 +456,7 @@ struct curlDataTransfer : public DataTransfer
 
     std::thread workerThread;
 
-    curlDataTransfer()
+    curlFileTransfer()
         : mt19937(rd())
     {
         static std::once_flag globalInit;
@@ -469,7 +469,7 @@ struct curlDataTransfer : public DataTransfer
         #endif
         #if LIBCURL_VERSION_NUM >= 0x071e00 // Max connections requires >= 7.30.0
         curl_multi_setopt(curlm, CURLMOPT_MAX_TOTAL_CONNECTIONS,
-            dataTransferSettings.httpConnections.get());
+            fileTransferSettings.httpConnections.get());
         #endif
 
         wakeupPipe.create();
@@ -478,7 +478,7 @@ struct curlDataTransfer : public DataTransfer
         workerThread = std::thread([&]() { workerThreadEntry(); });
     }
 
-    ~curlDataTransfer()
+    ~curlFileTransfer()
     {
         stopWorkerThread();
 
@@ -641,8 +641,8 @@ struct curlDataTransfer : public DataTransfer
     }
 #endif
 
-    void enqueueDataTransfer(const DataTransferRequest & request,
+    void enqueueFileTransfer(const FileTransferRequest & request,
-        Callback<DataTransferResult> callback) override
+        Callback<FileTransferResult> callback) override
     {
         /* Ugly hack to support s3:// URIs. */
         if (hasPrefix(request.uri, "s3://")) {
@@ -660,9 +660,9 @@ struct curlDataTransfer : public DataTransfer
 
                 // FIXME: implement ETag
                 auto s3Res = s3Helper.getObject(bucketName, key);
-                DataTransferResult res;
+                FileTransferResult res;
                 if (!s3Res.data)
-                    throw DataTransferError(NotFound, fmt("S3 object '%s' does not exist", request.uri));
+                    throw FileTransferError(NotFound, fmt("S3 object '%s' does not exist", request.uri));
                 res.data = s3Res.data;
                 callback(std::move(res));
 #else
@@ -676,22 +676,22 @@ struct curlDataTransfer : public DataTransfer
     }
 };
 
-ref<DataTransfer> getDataTransfer()
+ref<FileTransfer> getFileTransfer()
 {
-    static ref<DataTransfer> dataTransfer = makeDataTransfer();
+    static ref<FileTransfer> fileTransfer = makeFileTransfer();
-    return dataTransfer;
+    return fileTransfer;
 }
 
-ref<DataTransfer> makeDataTransfer()
+ref<FileTransfer> makeFileTransfer()
 {
-    return make_ref<curlDataTransfer>();
+    return make_ref<curlFileTransfer>();
 }
 
-std::future<DataTransferResult> DataTransfer::enqueueDataTransfer(const DataTransferRequest & request)
+std::future<FileTransferResult> FileTransfer::enqueueFileTransfer(const FileTransferRequest & request)
 {
-    auto promise = std::make_shared<std::promise<DataTransferResult>>();
+    auto promise = std::make_shared<std::promise<FileTransferResult>>();
-    enqueueDataTransfer(request,
+    enqueueFileTransfer(request,
-        {[promise](std::future<DataTransferResult> fut) {
+        {[promise](std::future<FileTransferResult> fut) {
             try {
                 promise->set_value(fut.get());
             } catch (...) {
@@ -701,21 +701,21 @@ std::future<DataTransferResult> DataTransfer::enqueueDataTransfer(const DataTran
     return promise->get_future();
 }
 
-DataTransferResult DataTransfer::download(const DataTransferRequest & request)
+FileTransferResult FileTransfer::download(const FileTransferRequest & request)
 {
-    return enqueueDataTransfer(request).get();
+    return enqueueFileTransfer(request).get();
 }
 
-DataTransferResult DataTransfer::upload(const DataTransferRequest & request)
+FileTransferResult FileTransfer::upload(const FileTransferRequest & request)
 {
     /* Note: this method is the same as download, but helps in readability */
-    return enqueueDataTransfer(request).get();
+    return enqueueFileTransfer(request).get();
 }
 
-void DataTransfer::download(DataTransferRequest && request, Sink & sink)
+void FileTransfer::download(FileTransferRequest && request, Sink & sink)
 {
     /* Note: we can't call 'sink' via request.dataCallback, because
-       that would cause the sink to execute on the dataTransfer
+       that would cause the sink to execute on the fileTransfer
        thread. If 'sink' is a coroutine, this will fail. Also, if the
        sink is expensive (e.g. one that does decompression and writing
        to the Nix store), it would stall the download thread too much.
@@ -761,8 +761,8 @@ void DataTransfer::download(DataTransferRequest && request, Sink & sink)
         state->avail.notify_one();
     };
 
-    enqueueDataTransfer(request,
+    enqueueFileTransfer(request,
-        {[_state](std::future<DataTransferResult> fut) {
+        {[_state](std::future<FileTransferResult> fut) {
             auto state(_state->lock());
             state->quit = true;
             try {

src/libstore/datatransfer.hh

@@ -9,7 +9,7 @@
 
 namespace nix {
 
-struct DataTransferSettings : Config
+struct FileTransferSettings : Config
 {
     Setting<bool> enableHttp2{this, true, "http2",
         "Whether to enable HTTP/2 support."};
@@ -31,15 +31,15 @@ struct DataTransferSettings : Config
         "How often Nix will attempt to download a file before giving up."};
 };
 
-extern DataTransferSettings dataTransferSettings;
+extern FileTransferSettings fileTransferSettings;
 
-struct DataTransferRequest
+struct FileTransferRequest
 {
     std::string uri;
     std::string expectedETag;
     bool verifyTLS = true;
     bool head = false;
-    size_t tries = dataTransferSettings.tries;
+    size_t tries = fileTransferSettings.tries;
     unsigned int baseRetryTimeMs = 250;
     ActivityId parentAct;
     bool decompress = true;
@@ -47,7 +47,7 @@ struct DataTransferRequest
     std::string mimeType;
     std::function<void(char *, size_t)> dataCallback;
 
-    DataTransferRequest(const std::string & uri)
+    FileTransferRequest(const std::string & uri)
         : uri(uri), parentAct(getCurActivity()) { }
 
     std::string verb()
@@ -56,7 +56,7 @@ struct DataTransferRequest
     }
 };
 
-struct DataTransferResult
+struct FileTransferResult
 {
     bool cached = false;
     std::string etag;
@@ -67,43 +67,43 @@ struct DataTransferResult
 
 class Store;
 
-struct DataTransfer
+struct FileTransfer
 {
-    virtual ~DataTransfer() { }
+    virtual ~FileTransfer() { }
 
     /* Enqueue a data transfer request, returning a future to the result of
-       the download. The future may throw a DataTransferError
+       the download. The future may throw a FileTransferError
        exception. */
-    virtual void enqueueDataTransfer(const DataTransferRequest & request,
+    virtual void enqueueFileTransfer(const FileTransferRequest & request,
-        Callback<DataTransferResult> callback) = 0;
+        Callback<FileTransferResult> callback) = 0;
 
-    std::future<DataTransferResult> enqueueDataTransfer(const DataTransferRequest & request);
+    std::future<FileTransferResult> enqueueFileTransfer(const FileTransferRequest & request);
 
     /* Synchronously download a file. */
-    DataTransferResult download(const DataTransferRequest & request);
+    FileTransferResult download(const FileTransferRequest & request);
 
     /* Synchronously upload a file. */
-    DataTransferResult upload(const DataTransferRequest & request);
+    FileTransferResult upload(const FileTransferRequest & request);
 
     /* Download a file, writing its data to a sink. The sink will be
        invoked on the thread of the caller. */
-    void download(DataTransferRequest && request, Sink & sink);
+    void download(FileTransferRequest && request, Sink & sink);
 
     enum Error { NotFound, Forbidden, Misc, Transient, Interrupted };
 };
 
-/* Return a shared DataTransfer object. Using this object is preferred
+/* Return a shared FileTransfer object. Using this object is preferred
    because it enables connection reuse and HTTP/2 multiplexing. */
-ref<DataTransfer> getDataTransfer();
+ref<FileTransfer> getFileTransfer();
 
-/* Return a new DataTransfer object. */
+/* Return a new FileTransfer object. */
-ref<DataTransfer> makeDataTransfer();
+ref<FileTransfer> makeFileTransfer();
 
-class DataTransferError : public Error
+class FileTransferError : public Error
 {
 public:
-    DataTransfer::Error error;
+    FileTransfer::Error error;
-    DataTransferError(DataTransfer::Error error, const FormatOrString & fs)
+    FileTransferError(FileTransfer::Error error, const FormatOrString & fs)
         : Error(fs), error(error)
     { }
 };

src/libstore/http-binary-cache-store.cc

@@ -85,14 +85,14 @@ protected:
         checkEnabled();
 
         try {
-            DataTransferRequest request(cacheUri + "/" + path);
+            FileTransferRequest request(cacheUri + "/" + path);
             request.head = true;
-            getDataTransfer()->download(request);
+            getFileTransfer()->download(request);
             return true;
-        } catch (DataTransferError & e) {
+        } catch (FileTransferError & e) {
             /* S3 buckets return 403 if a file doesn't exist and the
                bucket is unlistable, so treat 403 as 404. */
-            if (e.error == DataTransfer::NotFound || e.error == DataTransfer::Forbidden)
+            if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
                 return false;
             maybeDisable();
             throw;
@@ -103,19 +103,19 @@ protected:
         const std::string & data,
         const std::string & mimeType) override
     {
-        auto req = DataTransferRequest(cacheUri + "/" + path);
+        auto req = FileTransferRequest(cacheUri + "/" + path);
         req.data = std::make_shared<string>(data); // FIXME: inefficient
         req.mimeType = mimeType;
         try {
-            getDataTransfer()->upload(req);
+            getFileTransfer()->upload(req);
-        } catch (DataTransferError & e) {
+        } catch (FileTransferError & e) {
             throw UploadToHTTP("while uploading to HTTP binary cache at '%s': %s", cacheUri, e.msg());
         }
     }
 
-    DataTransferRequest makeRequest(const std::string & path)
+    FileTransferRequest makeRequest(const std::string & path)
     {
-        DataTransferRequest request(cacheUri + "/" + path);
+        FileTransferRequest request(cacheUri + "/" + path);
         return request;
     }
 
@@ -124,9 +124,9 @@ protected:
         checkEnabled();
         auto request(makeRequest(path));
         try {
-            getDataTransfer()->download(std::move(request), sink);
+            getFileTransfer()->download(std::move(request), sink);
-        } catch (DataTransferError & e) {
+        } catch (FileTransferError & e) {
-            if (e.error == DataTransfer::NotFound || e.error == DataTransfer::Forbidden)
+            if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
                 throw NoSuchBinaryCacheFile("file '%s' does not exist in binary cache '%s'", path, getUri());
             maybeDisable();
             throw;
@@ -142,12 +142,12 @@ protected:
 
         auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
 
-        getDataTransfer()->enqueueDataTransfer(request,
+        getFileTransfer()->enqueueFileTransfer(request,
-            {[callbackPtr, this](std::future<DataTransferResult> result) {
+            {[callbackPtr, this](std::future<FileTransferResult> result) {
                 try {
                     (*callbackPtr)(result.get().data);
-                } catch (DataTransferError & e) {
+                } catch (FileTransferError & e) {
-                    if (e.error == DataTransfer::NotFound || e.error == DataTransfer::Forbidden)
+                    if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
                         return (*callbackPtr)(std::shared_ptr<std::string>());
                     maybeDisable();
                     callbackPtr->rethrow();

src/libstore/s3-binary-cache-store.cc

@@ -132,7 +132,7 @@ ref<Aws::Client::ClientConfiguration> S3Helper::makeConfig(const string & region
     return res;
 }
 
-S3Helper::DataTransferResult S3Helper::getObject(
+S3Helper::FileTransferResult S3Helper::getObject(
     const std::string & bucketName, const std::string & key)
 {
     debug("fetching 's3://%s/%s'...", bucketName, key);
@@ -146,7 +146,7 @@ S3Helper::DataTransferResult S3Helper::getObject(
         return Aws::New<std::stringstream>("STRINGSTREAM");
     });
 
-    DataTransferResult res;
+    FileTransferResult res;
 
     auto now1 = std::chrono::steady_clock::now();
 

src/libstore/s3.hh

@@ -18,13 +18,13 @@ struct S3Helper
 
     ref<Aws::Client::ClientConfiguration> makeConfig(const std::string & region, const std::string & scheme, const std::string & endpoint);
 
-    struct DataTransferResult
+    struct FileTransferResult
     {
         std::shared_ptr<std::string> data;
         unsigned int durationMs;
     };
 
-    DataTransferResult getObject(
+    FileTransferResult getObject(
         const std::string & bucketName, const std::string & key);
 };
 

src/libutil/logging.cc

@@ -198,7 +198,7 @@ bool handleJSONLogMessage(const std::string & msg,
 
         if (action == "start") {
             auto type = (ActivityType) json["type"];
-            if (trusted || type == actDataTransfer)
+            if (trusted || type == actFileTransfer)
                 activities.emplace(std::piecewise_construct,
                     std::forward_as_tuple(json["id"]),
                     std::forward_as_tuple(*logger, (Verbosity) json["level"], type,

src/libutil/logging.hh

@@ -17,7 +17,7 @@ typedef enum {
 typedef enum {
     actUnknown = 0,
     actCopyPath = 100,
-    actDataTransfer = 101,
+    actFileTransfer = 101,
     actRealise = 102,
     actCopyPaths = 103,
     actBuilds = 104,

src/nix-prefetch-url/nix-prefetch-url.cc

@@ -180,9 +180,9 @@ static int _main(int argc, char * * argv)
 
                 FdSink sink(fd.get());
 
-                DataTransferRequest req(actualUri);
+                FileTransferRequest req(actualUri);
                 req.decompress = false;
-                getDataTransfer()->download(std::move(req), sink);
+                getFileTransfer()->download(std::move(req), sink);
             }
 
             /* Optionally unpack the file. */

src/nix/main.cc

@@ -176,10 +176,10 @@ void mainWrapped(int argc, char * * argv)
             settings.useSubstitutes = false;
         if (!settings.tarballTtl.overriden)
             settings.tarballTtl = std::numeric_limits<unsigned int>::max();
-        if (!dataTransferSettings.tries.overriden)
+        if (!fileTransferSettings.tries.overriden)
-            dataTransferSettings.tries = 0;
+            fileTransferSettings.tries = 0;
-        if (!dataTransferSettings.connectTimeout.overriden)
+        if (!fileTransferSettings.connectTimeout.overriden)
-            dataTransferSettings.connectTimeout = 1;
+            fileTransferSettings.connectTimeout = 1;
     }
 
     if (args.refresh)

src/nix/progress-bar.cc

@@ -190,8 +190,8 @@ public:
             i->s = fmt("querying " ANSI_BOLD "%s" ANSI_NORMAL " on %s", name, getS(fields, 1));
         }
 
-        if ((type == actDataTransfer && hasAncestor(*state, actCopyPath, parent))
+        if ((type == actFileTransfer && hasAncestor(*state, actCopyPath, parent))
-            || (type == actDataTransfer && hasAncestor(*state, actQueryPathInfo, parent))
+            || (type == actFileTransfer && hasAncestor(*state, actQueryPathInfo, parent))
             || (type == actCopyPath && hasAncestor(*state, actSubstitute, parent)))
             i->visible = false;
 
@@ -416,7 +416,7 @@ public:
             if (!s2.empty()) { res += " ("; res += s2; res += ')'; }
         }
 
-        showActivity(actDataTransfer, "%s MiB DL", "%.1f", MiB);
+        showActivity(actFileTransfer, "%s MiB DL", "%.1f", MiB);
 
         {
             auto s = renderActivity(actOptimiseStore, "%s paths optimised");

src/nix/upgrade-nix.cc

@@ -138,8 +138,8 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
         Activity act(*logger, lvlInfo, actUnknown, "querying latest Nix version");
 
         // FIXME: use nixos.org?
-        auto req = DataTransferRequest(storePathsUrl);
+        auto req = FileTransferRequest(storePathsUrl);
-        auto res = getDataTransfer()->download(req);
+        auto res = getFileTransfer()->download(req);
 
         auto state = std::make_unique<EvalState>(Strings(), store);
         auto v = state->allocValue();