git-annex 6.20170301.1 tarballs are no longer available anywhere; now we must use fetchgit

pkgs/development/haskell-modules/configuration-common.nix

@@ -59,14 +59,13 @@ self: super: {
   # Link the proper version.
   zeromq4-haskell = super.zeromq4-haskell.override { zeromq = pkgs.zeromq4; };
 
-  # The Hackage tarball is purposefully broken. Mr. Hess wants people to build
-  # his package from the Git repo because that is, like, better!
+  # The Hackage tarball is purposefully broken, because it's not intended to be, like, useful.
+  # https://git-annex.branchable.com/bugs/bash_completion_file_is_missing_in_the_6.20160527_tarball_on_hackage/
   git-annex = ((overrideCabal super.git-annex (drv: {
-    src = pkgs.fetchFromGitHub {
-      owner = "joeyh";
-      repo = "git-annex";
-      sha256 = "0f79i2i1cr8j02vc4ganw92prbkv9ca1yl9jgkny0rxf28wdlc6v";
-      rev = drv.version;
+    src = pkgs.fetchgit {
+      url = "git://git-annex.branchable.com/";
+      rev = "refs/tags/" + drv.version;
+      sha256 = "0irvzwpwxxdy6qs7jj81r6qk7i1gkkqyaza4wcm0phyyn07yh2sz";
     };
   }))).override {
     dbus = if pkgs.stdenv.isLinux then self.dbus else null;