(chocolateyGH-906) Fix source path used when installing from nuspec f…

…ile.

Previously when the install target was a nuspec file and the output
folder was not set to the folder that contained the nuspec file then
the installation failed because the nupkg file could not be found.
Update sets the sources parameter to the output folder during the
packaging of the nuspec file.

src/chocolatey.tests.integration/scenarios/PackScenarios.cs

@@ -70,6 +70,12 @@ public void generated_package_should_be_in_current_directory()
 
                 File.Exists(package_path).ShouldBeTrue();
             }
+
+            [Fact]
+            public void sources_should_be_set_to_current_directory()
+            {
+                Configuration.Sources.ShouldEqual(Scenario.get_top_level());                
+            }
         }
 
         [Concern(typeof(ChocolateyPackCommand))]
@@ -100,6 +106,12 @@ public void generated_package_should_be_in_specified_output_directory()
 
                 File.Exists(package_path).ShouldBeTrue();
             }
+
+            [Fact]
+            public void sources_should_be_set_to_specified_output_directory()
+            {
+                Configuration.Sources.ShouldEqual("PackageOutput");
+            }
         }
 
         private const string NuspecContent = @"<?xml version=""1.0"" encoding=""utf-8""?>

src/chocolatey/infrastructure.app/services/NugetService.cs

@@ -254,7 +254,10 @@ public void pack_run(ChocolateyConfiguration config)
             }
 
             string outputFile = builder.Id + "." + builder.Version + Constants.PackageExtension;
-            string outputPath = _fileSystem.combine_paths(config.OutputDirectory ?? _fileSystem.get_current_directory(), outputFile);
+            string outputFolder = config.OutputDirectory ?? _fileSystem.get_current_directory();
+            string outputPath = _fileSystem.combine_paths(outputFolder, outputFile);
+
+            config.Sources = outputFolder;
 
             this.Log().Info(() => "Attempting to build package from '{0}'.".format_with(_fileSystem.get_file_name(nuspecFilePath)));