1 files changed, 8 insertions, 5 deletions
diff --git a/lib/std/Build/Fuzz/WebServer.zig b/lib/std/Build/Fuzz/WebServer.zig
index b28a6e185c..0df43408f1 100644
--- a/lib/std/Build/Fuzz/WebServer.zig
+++ b/lib/std/Build/Fuzz/WebServer.zig
@@ -522,7 +522,9 @@ fn serveSourcesTar(ws: *WebServer, request: *std.http.Server.Request) !void {
 
     var cwd_cache: ?[]const u8 = null;
 
-    var archiver = std.tar.writer(response.writer());
+    var adapter = response.writer().adaptToNewApi();
+    var archiver: std.tar.Writer = .{ .underlying_writer = &adapter.new_interface };
+    var read_buffer: [1024]u8 = undefined;
 
     for (deduped_paths) |joined_path| {
         var file = joined_path.root_dir.handle.openFile(joined_path.sub_path, .{}) catch |err| {
@@ -530,13 +532,14 @@ fn serveSourcesTar(ws: *WebServer, request: *std.http.Server.Request) !void {
             continue;
         };
         defer file.close();
-
+        const stat = try file.stat();
+        var file_reader: std.fs.File.Reader = .initSize(file, &read_buffer, stat.size);
         archiver.prefix = joined_path.root_dir.path orelse try memoizedCwd(arena, &cwd_cache);
-        try archiver.writeFile(joined_path.sub_path, file);
+        try archiver.writeFile(joined_path.sub_path, &file_reader, stat.mtime);
     }
 
-    // intentionally omitting the pointless trailer
-    //try archiver.finish();
+    // intentionally not calling `archiver.finishPedantically`
+    try adapter.new_interface.flush();
     try response.end();
 }