Ensure we flatten compressor command too

pipeline/compressors/__init__.py

@@ -4,15 +4,17 @@ import base64
 import os
 import posixpath
 import re
+import subprocess
 
 from itertools import takewhile
 
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.utils.encoding import smart_bytes, force_text
+from django.utils.six import string_types
 
 from pipeline.conf import settings
-from pipeline.utils import to_class, relpath
 from pipeline.exceptions import CompressorError
+from pipeline.utils import to_class, relpath
 
 URL_DETECTOR = r"""url\((['"]){0,1}\s*(.*?)["']{0,1}\)"""
 URL_REPLACER = r"""url\(__EMBED__(.+?)(\?\d+)?\)"""
@@ -234,8 +236,14 @@ class CompressorBase(object):
 
 class SubProcessCompressor(CompressorBase):
     def execute_command(self, command, content):
-        import subprocess
-        pipe = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE,
+        argument_list = []
+        for flattening_arg in command:
+            if isinstance(flattening_arg, string_types):
+                argument_list.append(flattening_arg)
+            else:
+                argument_list.extend(flattening_arg)
+
+        pipe = subprocess.Popen(argument_list, shell=True, stdout=subprocess.PIPE,
                                 stdin=subprocess.PIPE, stderr=subprocess.PIPE)
         if content:
             content = smart_bytes(content)

tests/tests/test_compiler.py

@@ -7,7 +7,6 @@ from django.test import TestCase
 
 from pipeline.collector import default_collector
 from pipeline.compilers import Compiler, CompilerBase, SubProcessCompiler
-from pipeline.conf import settings
 from pipeline.exceptions import CompilerError
 
 from tests.utils import _, pipeline_settings

tests/tests/test_compressor.py

@@ -171,10 +171,9 @@ class CompressorTest(TestCase):
 """, output)
 
     def test_compressor_subprocess_unicode(self):
-        tests_path = os.path.dirname(os.path.dirname(__file__))
-        output = SubProcessCompressor(False).execute_command(
-            '/usr/bin/env cat',
-            io.open(tests_path + '/assets/css/unicode.css', encoding="utf-8").read())
+        path = os.path.dirname(os.path.dirname(__file__))
+        content = io.open(path + '/assets/css/unicode.css', encoding="utf-8").read()
+        output = SubProcessCompressor(False).execute_command(('cat',), content)
         self.assertEqual(""".some_class {
   // Some unicode
   content: "áéíóú";

tests/tests/test_storage.py

 from __future__ import unicode_literals
 
-from django.conf import settings
 from django.contrib.staticfiles import finders
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core.management import call_command

tests/tests/test_template.py

@@ -7,7 +7,6 @@ from django.template import Template, Context
 from django.test import TestCase
 
 from pipeline.jinja2 import PipelineExtension
-from pipeline.conf import settings
 
 from tests.utils import pipeline_settings