Provide a transition to new .info files.

Change-Id: I2fb6ef93c0652a797dba72cf75fb78baaa9c9c5a

2 files changed, 30 insertions, 1 deletions

diff --git a/nova/tests/test_imagecache.py b/nova/tests/test_imagecache.py
index 79d561001..2f611cb59 100644
--- a/nova/tests/test_imagecache.py
+++ b/nova/tests/test_imagecache.py
@@ -71,6 +71,23 @@ class ImageCacheManagerTestCase(test.TestCase):
             self.assertEquals(csum_input.rstrip(),
                               '{"sha1": "%s"}' % csum_output)
 
+    def test_read_stored_checksum_legacy_essex(self):
+        with utils.tempdir() as tmpdir:
+            self.flags(instances_path=tmpdir)
+            self.flags(image_info_filename_pattern=('$instances_path/'
+                                                    '%(image)s.info'))
+
+            fname = os.path.join(tmpdir, 'aaa')
+            old_fname = fname + '.sha1'
+            f = open(old_fname, 'w')
+            f.write('fdghkfhkgjjksfdgjksjkghsdf')
+            f.close()
+
+            csum_output = imagecache.read_stored_checksum(fname)
+            self.assertEquals(csum_output, 'fdghkfhkgjjksfdgjksjkghsdf')
+            self.assertFalse(os.path.exists(old_fname))
+            self.assertTrue(os.path.exists(virtutils.get_info_filename(fname)))
+
     def test_list_base_images(self):
         listing = ['00000001',
                    'ephemeral_0_20_None',
diff --git a/nova/virt/libvirt/utils.py b/nova/virt/libvirt/utils.py
index f4c6d20a5..cfc47b202 100644
--- a/nova/virt/libvirt/utils.py
+++ b/nova/virt/libvirt/utils.py
@@ -342,7 +342,19 @@ def read_stored_info(base_path, field=None):
 
     info_file = get_info_filename(base_path)
     if not os.path.exists(info_file):
-        d = {}
+        # Special case to handle essex checksums being converted
+        old_filename = base_path + '.sha1'
+        if field == 'sha1' and os.path.exists(old_filename):
+            hash_file = open(old_filename)
+            hash_value = hash_file.read()
+            hash_file.close()
+
+            write_stored_info(base_path, field=field, value=hash_value)
+            os.remove(old_filename)
+            d = {field: hash_value}
+
+        else:
+            d = {}
 
     else:
         LOG.info(_('Reading image info file: %s'), info_file)