From 3e3eaa90dd1aaf4684697f27726ec72aec75206c Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Fri, 12 Jun 2020 09:51:44 -0500
Subject: [PATCH] Remove hashed-mirrors

---
 doc/manual/command-ref/conf-file.xml | 28 ----------------------------
 src/libstore/builtins/fetchurl.cc    | 14 --------------
 src/libstore/globals.hh              |  3 ---
 3 files changed, 45 deletions(-)

diff --git a/doc/manual/command-ref/conf-file.xml b/doc/manual/command-ref/conf-file.xml
index 1fa74a143..9c55526a3 100644
--- a/doc/manual/command-ref/conf-file.xml
+++ b/doc/manual/command-ref/conf-file.xml
@@ -370,34 +370,6 @@ false</literal>.</para>
 
   </varlistentry>
 
-  <varlistentry xml:id="conf-hashed-mirrors"><term><literal>hashed-mirrors</literal></term>
-
-    <listitem><para>A list of web servers used by
-    <function>builtins.fetchurl</function> to obtain files by
-    hash. The default is
-    <literal>http://tarballs.nixos.org/</literal>. Given a hash type
-    <replaceable>ht</replaceable> and a base-16 hash
-    <replaceable>h</replaceable>, Nix will try to download the file
-    from
-    <literal>hashed-mirror/<replaceable>ht</replaceable>/<replaceable>h</replaceable></literal>.
-    This allows files to be downloaded even if they have disappeared
-    from their original URI. For example, given the default mirror
-    <literal>http://tarballs.nixos.org/</literal>, when building the derivation
-
-<programlisting>
-builtins.fetchurl {
-  url = "https://example.org/foo-1.2.3.tar.xz";
-  sha256 = "2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae";
-}
-</programlisting>
-
-    Nix will attempt to download this file from
-    <literal>http://tarballs.nixos.org/sha256/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae</literal>
-    first. If it is not available there, if will try the original URI.</para></listitem>
-
-  </varlistentry>
-
-
   <varlistentry xml:id="conf-http-connections"><term><literal>http-connections</literal></term>
 
     <listitem><para>The maximum number of parallel TCP connections
diff --git a/src/libstore/builtins/fetchurl.cc b/src/libstore/builtins/fetchurl.cc
index 486babf14..254cb4fce 100644
--- a/src/libstore/builtins/fetchurl.cc
+++ b/src/libstore/builtins/fetchurl.cc
@@ -58,20 +58,6 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
         }
     };
 
-    /* Try the hashed mirrors first. */
-    if (getAttr("outputHashMode") == "flat")
-        for (auto hashedMirror : settings.hashedMirrors.get())
-            try {
-                if (!hasSuffix(hashedMirror, "/")) hashedMirror += '/';
-                auto ht = parseHashType(getAttr("outputHashAlgo"));
-                auto h = Hash(getAttr("outputHash"), ht);
-                fetch(hashedMirror + printHashType(h.type) + "/" + h.to_string(Base16, false));
-                return;
-            } catch (Error & e) {
-                debug(e.what());
-            }
-
-    /* Otherwise try the specified URL. */
     fetch(mainUrl);
 }
 
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index da95fd3ae..2e1e405b3 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -339,9 +339,6 @@ public:
         "setuid/setgid bits or with file capabilities."};
 #endif
 
-    Setting<Strings> hashedMirrors{this, {"http://tarballs.nixos.org/"}, "hashed-mirrors",
-        "A list of servers used by builtins.fetchurl to fetch files by hash."};
-
     Setting<uint64_t> minFree{this, 0, "min-free",
         "Automatically run the garbage collector when free disk space drops below the specified amount."};