Add an HTTP binary cache store

Allowing stuff like

  NIX_REMOTE=https://cache.nixos.org nix-store -qR /nix/store/x1p1gl3a4kkz5ci0nfbayjqlqmczp1kq-geeqie-1.1

or

  NIX_REMOTE=https://cache.nixos.org nix-store --export /nix/store/x1p1gl3a4kkz5ci0nfbayjqlqmczp1kq-geeqie-1.1 | nix-store --import

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
index a1c4b48bf62e..c22c44f3c7e3 100644
--- a/src/libstore/builtins.cc
+++ b/src/libstore/builtins.cc
@@ -17,9 +17,9 @@ void builtinFetchurl(const BasicDerivation & drv)
     options.verifyTLS = false;
 
     /* Show a progress indicator, even though stderr is not a tty. */
-    options.forceProgress = true;
+    options.showProgress = DownloadOptions::yes;
 
-    auto data = downloadFile(url->second, options);
+    auto data = makeDownloader()->download(url->second, options);
 
     auto out = drv.env.find("out");
     if (out == drv.env.end()) throw Error("attribute ‘url’ missing");