lib/fetchers.nix: factor out impure proxy vars (#18702)

Apparently everyone just copied those variables, instead of creating a library constant for them. Some even removed the comment. -.-
2016-09-17 21:50:01 +02:00
parent aa7ab01131
commit 61462c94e6
14 changed files with 29 additions and 72 deletions
@@ -26,17 +26,11 @@ let layer = stdenv.mkDerivation {
  outputHash = sha256;
  outputHashMode = "recursive";

-  impureEnvVars = [
-    # We borrow these environment variables from the caller to allow
-    # easy proxy configuration.  This is impure, but a fixed-output
-    # derivation like fetchurl is allowed to do so since its result is
-    # by definition pure.
-    "http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
-
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ [
    # This variable allows the user to pass additional options to curl
    "NIX_CURL_FLAGS"
  ];
-  
+
  # Doing the download on a remote machine just duplicates network
  # traffic, so don't do that.
  preferLocalBuild = true;