add etcdctl package

pkgs/development/tools/etcdctl/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, lib, go, fetchurl, fetchgit, fetchhg, fetchbzr, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  version = "0.4.3";
+  name = "etcdctl-${version}";
+
+  src = import ./deps.nix {
+    inherit stdenv lib fetchgit fetchhg fetchbzr fetchFromGitHub;
+  };
+
+  buildInputs = [ go ];
+
+  buildPhase = ''
+    export GOPATH=$src
+    go build -v -o etcdctl github.com/coreos/etcdctl
+  '';
+
+  installPhase = ''
+    ensureDir $out/bin
+    mv etcdctl $out/bin
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A simple command line client for etcd";
+    homepage = http://coreos.com/using-coreos/etcd/;
+    license = licenses.asl20;
+    maintainers = with maintainers; [ cstrahan ];
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/etcdctl/deps.nix

@@ -0,0 +1,27 @@
+{ stdenv, lib, fetchgit, fetchhg, fetchbzr, fetchFromGitHub }:
+
+let
+  goDeps = [
+    {
+      root = "github.com/coreos/etcdctl";
+      src = fetchFromGitHub {
+        owner = "coreos";
+        repo = "etcdctl";
+        rev = "061135b2a02797a6b3c2b6c01183517c1bc76a2c";
+        sha256 = "1hl9cz9ygr2k4d67qj9q1xj0n64b28qjy5sv7zylgg9h9ag2j2p4";
+      };
+    }
+  ];
+
+in
+
+stdenv.mkDerivation rec {
+  name = "go-deps";
+
+  buildCommand =
+    lib.concatStrings
+      (map (dep: ''
+              mkdir -p $out/src/`dirname ${dep.root}`
+              ln -s ${dep.src} $out/src/${dep.root}
+            '') goDeps);
+}

pkgs/top-level/all-packages.nix

@@ -6642,6 +6642,8 @@ let
 
   elasticmq = callPackage ../servers/elasticmq { };
 
+  etcdctl = callPackage ../development/tools/etcdctl { };
+
   fcgiwrap = callPackage ../servers/fcgiwrap { };
 
   felix = callPackage ../servers/felix { };