push sheeet

pkgs/development/tools/build-managers/drake/Gemfile

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+source 'https://rubygems.org'
+gem 'drake'

pkgs/development/tools/build-managers/drake/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    comp_tree (1.1.3)
+    drake (0.9.2.0.3.1)
+      comp_tree (>= 1.1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  drake
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/build-managers/drake/default.nix

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+{
+  lib,
+  bundlerApp,
+  bundlerUpdateScript,
+}:
+
+bundlerApp {
+  pname = "drake";
+  gemdir = ./.;
+  exes = [ "drake" ];
+
+  passthru.updateScript = bundlerUpdateScript "drake";
+
+  meta = with lib; {
+    description = "Branch of Rake supporting automatic parallelizing of tasks";
+    homepage = "http://quix.github.io/rake/";
+    maintainers = with maintainers; [
+      romildo
+      manveru
+      nicknovitski
+    ];
+    license = licenses.mit;
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/build-managers/drake/gemset.nix

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+{
+  comp_tree = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "0dj9lkfxcczn67l1j12dcxswrfxxd1zgxa344zk6vqs2gwwhy9m9";
+      type = "gem";
+    };
+    version = "1.1.3";
+  };
+  drake = {
+    dependencies = [ "comp_tree" ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "09gkmdshwdmdnkdxi03dv4rk1dip0wdv6dx14wscrmi0jyk86yag";
+      type = "gem";
+    };
+    version = "0.9.2.0.3.1";
+  };
+}