command-processor.rb: return executable file only

* lib/shell/command-processor.rb (Shell::CommandProcessor#find_system_command):
  return executable file only, should ignore directories and
  unexecutable files.  [ruby-core:57235] [Bug #8918]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42962 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/shell/test_command_processor.rb

@@ -0,0 +1,45 @@
+require 'shell'
+require 'tmpdir'
+require_relative '../ruby/envutil'
+
+class TestShell < Test::Unit::TestCase
+end
+class TestShell::CommandProcessor < Test::Unit::TestCase
+  def setup
+    @tmpdir = Dir.mktmpdir("test_shell")
+    @shell = Shell.new
+    @shell.system_path = [@tmpdir]
+  end
+
+  def catch_command_start(tc = Object.new)
+    @shell.process_controller.singleton_class.class_eval do
+      define_method(:add_schedule) {|cmd| throw tc, cmd}
+    end
+    tc
+  end
+
+  def test_system_external
+    ext = RbConfig::CONFIG["EXECUTABLE_EXTS"][/\S+\z/]
+    path = File.join(@tmpdir, "foo#{ext}")
+    open(path, "w", 0755) {}
+
+    cmd = assert_throw(catch_command_start) {@shell.system("foo")}
+    assert_equal(path, cmd.command)
+  ensure
+    File.unlink(path)
+  end
+
+  def test_system_not_found
+    bug8918 = '[ruby-core:57235] [Bug #8918]'
+
+    path = File.join(@tmpdir, "foo")
+    open(path, "w", 0644) {}
+
+    assert_raise(Shell::Error::CommandNotFound, bug8918) {
+      catch(catch_command_start) {@shell.system("foo")}
+    }
+  ensure
+    Process.waitall
+    File.unlink(path)
+  end
+end