Add --script-cmd opt

Allows configuring a custom script to be executed for running the specs.

In this scenario, if this is specific to a particular TEST_REPO, then
this will only work with said repo and the user will have to configure
the cross repo run for that test in particular, and leave the others as
the default.

Author: NickLaMuro

exe/manageiq-cross_repo

@@ -31,6 +31,10 @@ opts = Optimist.options do
     Can also be passed as a REPOS environment variable.
   EOS
 
+  opt :script_cmd, <<~EOS, :type => :string, :default => ENV["SCRIPT_CMD"].presence || ""
+    Optional, a command string for running the specs.  Defaults to `bundle exec rake`.
+  EOS
+
   # Manually add these so they appear in the right order in the help output
   banner ""
   opt :version, "Print version and exit"
@@ -86,7 +90,7 @@ end
 opts[:repos] = opts[:repos].flatten.flat_map { |repo| repo.split(",").map(&:strip) }
 
 begin
-  ManageIQ::CrossRepo.run(opts[:test_repo], opts[:repos])
+  ManageIQ::CrossRepo.run(opts[:test_repo], opts[:repos], opts[:script_cmd])
 rescue ArgumentError => e
   Optimist.die e
 end

lib/manageiq/cross_repo/runner.rb

@@ -3,9 +3,9 @@
 
 module ManageIQ::CrossRepo
   class Runner
-    attr_reader :test_repo, :core_repo, :gem_repos
+    attr_reader :test_repo, :core_repo, :gem_repos, :script_cmd
 
-    def initialize(test_repo, repos)
+    def initialize(test_repo, repos, script_cmd = "")
       @test_repo = Repository.new(test_repo || "ManageIQ/manageiq@master")
 
       core_repos, @gem_repos = Array(repos).collect { |repo| Repository.new(repo) }.partition(&:core?)
@@ -20,6 +20,8 @@ def initialize(test_repo, repos)
 
         @core_repo ||= Repository.new("ManageIQ/manageiq@master")
       end
+
+      @script_cmd = script_cmd.presence || "bundle exec rake"
     end
 
     def run
@@ -35,7 +37,7 @@ def run_tests
       with_test_env do
         system!({"TRAVIS_BUILD_DIR" => test_repo.path.to_s}, "bash", "tools/ci/before_install.sh") if ENV["CI"] && File.exist?("tools/ci/before_install.sh")
         system!(env_vars, "bin/setup")
-        system!("bundle exec rake")
+        system!(script_cmd)
       end
     end