hg-git: add 0.9.0a1 for py3, and use that

nix/pkgs/default.nix

@@ -3,4 +3,5 @@ args: {
   plex-pass = import ./plex-pass.nix args;
   secretsync = import ./secretsync args;
   copybara = import ./copybara.nix args;
+  hg-git = import ./hg-git.nix args;
 } // (import ./heptapod-runner.nix args)

nix/pkgs/hg-git.nix

@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+with pkgs;
+with pkgs.python3Packages;
+(buildPythonPackage rec {
+  pname = "hg-git";
+  version = "0.9.0a1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1lhb813zljki3q10bx3n9d7c075s6ahhak5d3a1m6gaxmy6gzj5y";
+  };
+
+  doCheck = false;
+
+  propagatedBuildInputs = [ dulwich ];
+
+  meta = with stdenv.lib; {
+    description = "Push and pull from a Git server using Mercurial";
+    homepage = "http://hg-git.github.com/";
+    license = licenses.gpl2;
+  };
+})

ops/nixos/lib/common.nix

@@ -21,7 +21,7 @@ in
   environment.systemPackages = with pkgs; [
     vim rxvt_unicode.terminfo rebuilder
     (mercurial.overridePythonAttrs (origAttrs: {
-      propagatedBuildInputs = origAttrs.propagatedBuildInputs ++ [python3Packages.hg-evolve];
+      propagatedBuildInputs = origAttrs.propagatedBuildInputs ++ [python3Packages.hg-evolve depot.nix.pkgs.hg-git];
     }))
   ];
 

ops/nixos/lib/hgrc

@@ -54,3 +54,4 @@ remotenames =
 amend =
 evolve =
 topic =
+hggit =