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. -.-
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@@ -20,13 +20,7 @@ let
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# "gnu", etc.).
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sites = builtins.attrNames mirrors;
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impureEnvVars = [
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# We borrow these environment variables from the caller to allow
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# easy proxy configuration. This is impure, but a fixed-output
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# derivation like fetchurl is allowed to do so since its result is
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# by definition pure.
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"http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
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impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars ++ [
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# This variable allows the user to pass additional options to curl
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"NIX_CURL_FLAGS"
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