Restore the original working directory after the recipe finishes.

This change makes sure that the working directory is restored to the location
it was before running the recipe, regardless whether the execution of the
recipe is successful or not.

Thanks to Jonathan Ballet for pointing out this problem.

hexagonit/recipe/cmmi/__init__.py

@@ -112,9 +112,11 @@ class Recipe(object):
             log.info('Using local source directory: %s' % self.options['path'])
             compile_dir = self.options['path']
 
+        current_dir = os.getcwd()
         os.mkdir(self.options['location'])
         os.chdir(compile_dir)
 
+        try:
             try:
                 if not self.is_build_dir():
                     contents = os.listdir(compile_dir)
@@ -153,6 +155,8 @@ class Recipe(object):
                 log.error('Compilation error. The package is left as is at %s where '
                           'you can inspect what went wrong' % os.getcwd())
                 raise
+        finally:
+            os.chdir(current_dir)
 
         if self.options['url']:
             if self.options.get('keep-compile-dir', '').lower() in ('true', 'yes', '1', 'on'):

hexagonit/recipe/cmmi/tests.py

@@ -6,6 +6,7 @@ import re
 import shutil
 import tempfile
 import unittest
+import zc.buildout
 import zc.buildout.testing
 import zc.buildout.tests
 
@@ -21,7 +22,7 @@ def setUp(test):
 class NonInformativeTests(unittest.TestCase):
 
     def setUp(self):
-        self.dir = tempfile.mkdtemp()
+        self.dir = os.path.realpath(tempfile.mkdtemp())
 
     def tearDown(self):
         shutil.rmtree(self.dir)
@@ -35,9 +36,11 @@ class NonInformativeTests(unittest.TestCase):
 
     def make_recipe(self, buildout, name, options):
         from hexagonit.recipe.cmmi import Recipe
+        parts_directory_path = os.path.join(self.dir, 'test_parts')
+        os.mkdir(parts_directory_path)
         bo = {
             'buildout' : {
-                'parts-directory' : '',
+                'parts-directory' : parts_directory_path,
             }
         }
         bo.update(buildout)
@@ -61,6 +64,24 @@ class NonInformativeTests(unittest.TestCase):
         self.failUnless(os.path.exists(makefile))
         self.failUnless(recipe.is_build_dir())
 
+    def test_working_directory_restored_after_failure(self):
+        compile_directory = os.path.join(self.dir, 'compile_directory')
+        os.makedirs(compile_directory)
+        recipe = self.make_recipe({}, 'test', {'path' : compile_directory})
+        os.chdir(self.dir)
+
+        self.assertRaises(zc.buildout.UserError, recipe.install)
+        self.assertEquals(self.dir, os.getcwd())
+
+    def test_working_directory_restored_after_success(self):
+        compile_directory = os.path.join(self.dir, 'compile_directory')
+        os.makedirs(compile_directory)
+        self.write_file(os.path.join(compile_directory, 'configure'), 'Dummy configure')
+        
+        recipe = self.make_recipe({}, 'test', {'path' : compile_directory})
+        os.chdir(self.dir)
+        self.assertEquals(self.dir, os.getcwd())
+
 
 def test_suite():
     suite = unittest.TestSuite((