git-annex: work around Joey Hess' latest brain fart

Now we're releasing incomplete Hackage tarballs on purpose:

  http://git-annex.branchable.com/bugs/bash_completion_file_is_missing_in_the_6.20160527_tarball_on_hackage/

You know, I'll fix this shit one last time, but on the next occasion
upstream breaks the build for no apparent reason, I'm going to abandon
this project and leave it to someone else to package, because these kind
of wacko engineering decisions cast a bad light on the soundness of
git-annex as a whole, IMHO.

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

@@ -65,7 +65,21 @@ self: super: {
     fdo-notify = if pkgs.stdenv.isLinux then self.fdo-notify else null;
     hinotify = if pkgs.stdenv.isLinux then self.hinotify else self.fsnotify;
   };
-  git-annex-with-assistant = super.git-annex.override {
+  # Joey Hess is nuts. The release tarball uploaded to Hackage deliberately
+  # lacks files to break in the installation procedure, because ... you know
+  # ... because! He feels people shouldn't use the tarballs he publishes and
+  # instead use the git repository instead. Which makes me seriously wonder why
+  # the f*ck I'm spending my spare time packaging this crap when I could just
+  # as well install Syncthing in the time I routinely waste adding kludges to
+  # work around this guy's crazy ideas of how to express his individuality.
+  git-annex-with-assistant = (overrideCabal super.git-annex (drv: {
+    src = pkgs.fetchFromGitHub {
+      owner = "joeyh";
+      repo = "git-annex";
+      sha256 = "1cmyf94jvfjwiibmhkkbrplq63g1yvy5kn65993zs10zgcfip3jb";
+      rev = drv.version;
+    };
+  })).override {
     dbus = if pkgs.stdenv.isLinux then self.dbus else null;
     fdo-notify = if pkgs.stdenv.isLinux then self.fdo-notify else null;
     hinotify = if pkgs.stdenv.isLinux then self.hinotify else self.fsnotify;