Add a class to manage the staging area for builds

1 files changed, 75 insertions, 0 deletions

diff --git a/morphlib/stagingarea_tests.py b/morphlib/stagingarea_tests.py
new file mode 100644
index 00000000..c6b17610
--- /dev/null
+++ b/morphlib/stagingarea_tests.py
@@ -0,0 +1,75 @@
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+import os
+import shutil
+import tarfile
+import tempfile
+import unittest
+
+import morphlib
+
+
+class StagingAreaTests(unittest.TestCase):
+
+    def setUp(self):
+        self.tempdir = tempfile.mkdtemp()
+        self.staging = os.path.join(self.tempdir, 'staging')
+        self.sa = morphlib.stagingarea.StagingArea(self.staging)
+
+    def tearDown(self):
+        shutil.rmtree(self.tempdir)
+        
+    def create_chunk(self):
+        chunkdir = os.path.join(self.tempdir, 'chunk')
+        os.mkdir(chunkdir)
+        with open(os.path.join(chunkdir, 'file.txt'), 'w'):
+            pass
+        chunk_tar = os.path.join(self.tempdir, 'chunk.tar')
+        tf = tarfile.TarFile(name=chunk_tar, mode='w')
+        tf.add(chunkdir, arcname='.')
+        tf.close()
+        
+        return chunk_tar
+        
+    def list_tree(self, root):
+        files = []
+        for dirname, subdirs, basenames in os.walk(root):
+            paths = [os.path.join(dirname, x) for x in basenames]
+            for x in [dirname] + sorted(paths):
+                files.append(x[len(root):] or '/')
+        return files
+
+    def test_remembers_specified_directory(self):
+        self.assertEqual(self.sa.dirname, self.staging)
+
+    def test_accepts_root_directory(self):
+        sa = morphlib.stagingarea.StagingArea('/')
+        self.assertEqual(sa.dirname, '/')
+        
+    def test_installs_artifact(self):
+        chunk_tar = self.create_chunk()
+        with open(chunk_tar, 'rb') as f:
+            self.sa.install_artifact(f)
+        self.assertEqual(self.list_tree(self.staging), ['/', '/file.txt'])
+
+    def test_removes_everything(self):
+        chunk_tar = self.create_chunk()
+        with open(chunk_tar, 'rb') as f:
+            self.sa.install_artifact(f)
+        self.sa.remove()
+        self.assertFalse(os.path.exists(self.staging))
+