fix absolute path generation

pipeline/compressors/__init__.py

@@ -122,7 +122,7 @@ class Compressor(object):
 
     def construct_asset_path(self, asset_path, css_path, variant=None):
         """Return a rewritten asset URL for a stylesheet"""
-        public_path = self.absolute_path(asset_path, css_path)
+        public_path = self.absolute_path(asset_path, os.path.dirname(css_path))
         if self.embeddable(public_path, variant):
             return "__EMBED__%s" % public_path
         if not os.path.isabs(asset_path):
@@ -195,7 +195,7 @@ class Compressor(object):
         if os.path.isabs(path):
             path = os.path.join(settings.PIPELINE_ROOT, path)
         else:
-            path = os.path.join(os.path.dirname(start), path)
+            path = os.path.join(start, path)
         return os.path.normpath(path)
 
     def relative_path(self, absolute_path):

tests/runtests.py

@@ -16,9 +16,9 @@ if not settings.configured:
             'tests'
         ],
         MEDIA_URL='/media/',
-        MEDIA_ROOT=os.path.join(TEST_DIR, 'media/'),
+        MEDIA_ROOT=os.path.join(TEST_DIR, 'media'),
         STATIC_URL='/static/',
-        STATIC_ROOT=os.path.join(TEST_DIR, 'static/'),
+        STATIC_ROOT=os.path.join(TEST_DIR, 'static'),
         TEMPLATE_DIRS=(
             os.path.join(TEST_DIR, 'templates'),
         ),

tests/tests/compressor.py

@@ -52,10 +52,10 @@ class CompressorTest(TestCase):
 
     def test_absolute_path(self):
         absolute_path = self.compressor.absolute_path('../../images/sprite.png',
-            'css/plugins/gallery.css')
+            'css/plugins/')
         self.assertEquals(absolute_path, 'images/sprite.png')
         absolute_path = self.compressor.absolute_path('/images/sprite.png',
-            'css/plugins/gallery.css')
+            'css/plugins/')
         self.assertEquals(absolute_path, '/images/sprite.png')
 
     def test_template_name(self):