fetchurl: add user agent

It would be nice to be able to track Nix requests. It's not trustworthy, but can be helpful for stats and routing in HTTP logs. Since `fetchurl` is used so widely, we should "magically" get a UA on `fetchzip`, `fetchFromGitHub`, and other related fetchers. Since `fetchurl` is only used for fixed-output derivations, this should cause no mass rebuild.
NixOS · Aug 15, 2016 · cfe35e9 · cfe35e9
1 parent de27f97
commit cfe35e9
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diff --git a/pkgs/build-support/fetchurl/builder.sh b/pkgs/build-support/fetchurl/builder.sh
@@ -13,6 +13,7 @@ curl="curl \
  --disable-epsv \
  --cookie-jar cookies \
  --insecure \
+ --user-agent "$userAgent" \
  $curlOpts \
  $NIX_CURL_FLAGS"
 

diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
@@ -124,6 +124,8 @@ if (!hasHash) then throw "Specify hash for fetchurl fixed-output derivation: ${s
 
   inherit curlOpts showURLs mirrorsFile impureEnvVars postFetch downloadToTemp executable;
 
+  userAgent = "Nix/${builtins.nixVersion}; nixpkgs/${stdenv.lib.nixpkgsVersion}";
+
   # Doing the download on a remote machine just duplicates network
   # traffic, so don't do that.
   preferLocalBuild = true;