Allow activities to be nested

In particular, this allows more relevant activities ("substituting X")
to supersede inferior ones ("downloading X").

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 71b720a3b59e..a20999176778 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -85,7 +85,7 @@ struct CurlDownloader : public Downloader
         DownloadItem(CurlDownloader & downloader, const DownloadRequest & request)
             : downloader(downloader)
             , request(request)
-            , act(*logger, actDownload, fmt("downloading '%s'", request.uri))
+            , act(*logger, actDownload, fmt("downloading '%s'", request.uri), {}, request.parentAct)
         {
             if (!request.expectedETag.empty())
                 requestHeaders = curl_slist_append(requestHeaders, ("If-None-Match: " + request.expectedETag).c_str());