Fix parsing of un-numbered messages in series

Say we are sent the following:

          - [PATCH 0/2] A sample series
            - [PATCH 1/2] test: Add some lorem ipsum
            - Random message with diff

We expect that:
 1) we parse normally without errors
 2) we get a series with a cover letter and a patch
 3) the random message is orphaned

What happens is that we get an integrity error, boiling down to:

(1048, "Column 'number' cannot be null")

This is caused because we believe that the random message belongs
to the series because of the headers, but because there are no
numbers in the Subject, we pass "None" into the number field of
SeriesPatch. That turns into a null, and rightly hits an integrity
error.

Fix this by requring that a message has a series _and_ a number
before we try to add it to the series.

Add a test to verify correctness.

Reported-by: Daniel Wagner <wagi@monom.org>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Stephen Finucane <stephen@that.guru>

3 files changed, 148 insertions, 1 deletions

diff --git a/patchwork/parser.py b/patchwork/parser.py
index a4036ff..b1544c9 100644
--- a/patchwork/parser.py
+++ b/patchwork/parser.py
@@ -820,7 +820,10 @@ def parse_mail(mail, list_id=None):
         patch.save()
         logger.debug('Patch saved')
 
-        if series:
+        # add to a series if we have found one, and we have a numbered
+        # patch. Don't add unnumbered patches (for example diffs sent
+        # in reply, or just messages with random refs/in-reply-tos)
+        if series and x:
             series.add_patch(patch, x)
 
         return patch
diff --git a/patchwork/tests/series/bugs-unnumbered.mbox b/patchwork/tests/series/bugs-unnumbered.mbox
new file mode 100644
index 0000000..1448e99
--- /dev/null
+++ b/patchwork/tests/series/bugs-unnumbered.mbox
@@ -0,0 +1,124 @@
+From stephenfinucane@gmail.com Sun Sep 11 23:22:13 2016
+Return-Path: <stephenfinucane@gmail.com>
+From: Stephen Finucane <stephenfinucane@gmail.com>
+To: stephenfinucane@hotmail.com
+Subject: [PATCH 0/2] A sample series
+Date: Sun, 11 Sep 2016 23:22:02 +0100
+Message-ID: <1473632524-8585-1-git-send-email-stephenfinucane@gmail.com>
+X-Mailer: git-send-email 2.7.4
+MIME-Version: 1.0
+Content-Type: text/plain
+Content-Length: 395
+Lines: 18
+
+From: Stephen Finucane <stephenfinucane@hotmail.com>
+
+This is a sample cover letter. It doesn't really contribute to the
+conversation, but I added it anway.
+
+Stephen Finucane (2):
+  test: Add some lorem ipsum
+  test: Convert to Markdown
+
+ test.md  | 8 ++++++++
+ test.txt | 1 -
+ 2 files changed, 8 insertions(+), 1 deletion(-)
+ create mode 100644 test.md
+ delete mode 100644 test.txt
+
+-- 
+2.7.4
+
+
+From stephenfinucane@gmail.com Sun Sep 11 23:22:13 2016
+Return-Path: <stephenfinucane@gmail.com>
+From: Stephen Finucane <stephenfinucane@gmail.com>
+To: stephenfinucane@hotmail.com
+Subject: [PATCH 1/2] test: Add some lorem ipsum
+Date: Sun, 11 Sep 2016 23:22:03 +0100
+Message-ID: <1473632524-8585-2-git-send-email-stephenfinucane@gmail.com>
+X-Mailer: git-send-email 2.7.4
+In-Reply-To: <1473632524-8585-1-git-send-email-stephenfinucane@gmail.com>
+References: <1473632524-8585-1-git-send-email-stephenfinucane@gmail.com>
+MIME-Version: 1.0
+Content-Type: text/plain
+Content-Length: 670
+Lines: 22
+
+From: Stephen Finucane <stephenfinucane@hotmail.com>
+
+---
+ test.txt | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/test.txt b/test.txt
+index f75ba05..a6c61c0 100644
+--- a/test.txt
++++ b/test.txt
+@@ -1 +1,8 @@
+ Hello, world.
++
++Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget eleifend
++augue. Nullam at metus venenatis, laoreet neque nec, convallis mauris.
++Pellentesque aliquam at nisi et laoreet. Duis non nisl venenatis, rhoncus risus
++id, elementum felis. In hac habitasse platea dictumst. Nam sit amet maximus
++eros. Nam quis ligula ut tortor egestas bibendum. Nunc sed purus sit amet
++tellus commodo bibendum ut vel dolor.
+-- 
+2.7.4
+
+
+From stephenfinucane@gmail.com Sun Sep 11 23:22:16 2016
+Return-Path: <stephenfinucane@gmail.com>
+From: Stephen Finucane <stephenfinucane@gmail.com>
+To: stephenfinucane@hotmail.com
+Subject: This is an orphaned patch!
+Date: Sun, 11 Sep 2016 23:22:04 +0100
+Message-ID: <1473632524-8585-3-git-send-email-stephenfinucane@gmail.com>
+X-Mailer: git-send-email 2.7.4
+In-Reply-To: <1473632524-8585-1-git-send-email-stephenfinucane@gmail.com>
+References: <1473632524-8585-1-git-send-email-stephenfinucane@gmail.com>
+MIME-Version: 1.0
+Content-Type: text/plain
+Content-Length: 1345
+Lines: 40
+
+From: Stephen Finucane <stephenfinucane@hotmail.com>
+
+---
+ test.md  | 8 ++++++++
+ test.txt | 8 --------
+ 2 files changed, 8 insertions(+), 8 deletions(-)
+ create mode 100644 test.md
+ delete mode 100644 test.txt
+
+diff --git a/test.md b/test.md
+new file mode 100644
+index 0000000..e5ff90e
+--- /dev/null
++++ b/test.md
+@@ -0,0 +1,8 @@
++# Hello, world
++
++Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget eleifend
++augue. Nullam at metus venenatis, laoreet neque nec, convallis mauris.
++Pellentesque aliquam at nisi et laoreet. Duis non nisl venenatis, rhoncus risus
++id, elementum felis. In hac habitasse platea dictumst. Nam sit amet maximus
++eros. Nam quis ligula ut tortor egestas bibendum. Nunc sed purus sit amet
++tellus commodo bibendum ut vel dolor.
+diff --git a/test.txt b/test.txt
+deleted file mode 100644
+index a6c61c0..0000000
+--- a/test.txt
++++ /dev/null
+@@ -1,8 +0,0 @@
+-Hello, world.
+-
+-Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget eleifend
+-augue. Nullam at metus venenatis, laoreet neque nec, convallis mauris.
+-Pellentesque aliquam at nisi et laoreet. Duis non nisl venenatis, rhoncus risus
+-id, elementum felis. In hac habitasse platea dictumst. Nam sit amet maximus
+-eros. Nam quis ligula ut tortor egestas bibendum. Nunc sed purus sit amet
+-tellus commodo bibendum ut vel dolor.
+-- 
+2.7.4
diff --git a/patchwork/tests/test_series.py b/patchwork/tests/test_series.py
index 7879db9..ee59a58 100644
--- a/patchwork/tests/test_series.py
+++ b/patchwork/tests/test_series.py
@@ -288,6 +288,26 @@ class RevisedSeriesTest(_BaseTestCase):
         self.assertSerialized(patches, [2, 2])
         self.assertSerialized(covers, [1, 1])
 
+    def test_unnumbered(self):
+        """Series with a reply with a diff but no number.
+
+        The random message with the diff should not belong to the
+        series, as it lacks a n/N label. We expect 1 series and the
+        random message to be orphaned.
+
+        Input:
+
+          - [PATCH 0/2] A sample series
+            - [PATCH 1/2] test: Add some lorem ipsum
+            - This is an orphaned patch!
+        """
+        covers, patches, _ = self._parse_mbox(
+            'bugs-unnumbered.mbox', [1, 2, 0])
+
+        self.assertEqual(len([p for p in patches if p.latest_series]), 1)
+        self.assertEqual(len([p for p in patches if not p.latest_series]), 1)
+        self.assertSerialized(covers, [1])
+
 
 class SeriesNameTestCase(TestCase):