Add oldrev/newrev column to the buildset reporter table

This change adds oldrev/newrev column to the zuul_buildset sql table to
be able to query post job for a specific commit.

Change-Id: Ic9c0b260560123d080fa47c47a76fcfa31eb3607

tests/unit/test_connection.py

@@ -69,7 +69,7 @@ class TestSQLConnection(ZuulDBTestCase):
         insp = sa.engine.reflection.Inspector(
             self.connections.connections['resultsdb'].engine)
 
-        self.assertEqual(11, len(insp.get_columns(buildset_table)))
+        self.assertEqual(13, len(insp.get_columns(buildset_table)))
         self.assertEqual(10, len(insp.get_columns(build_table)))
 
     def test_sql_results(self):

zuul/driver/sql/alembic_reporter/versions/ba4cdce9b18c_add_rev_columns.py

@@ -0,0 +1,26 @@
+"""Add oldrev/newrev columns
+
+Revision ID: ba4cdce9b18c
+Revises: 5efb477fa963
+Create Date: 2017-09-27 19:33:21.800198
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'ba4cdce9b18c'
+down_revision = '5efb477fa963'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('zuul_buildset', sa.Column('oldrev', sa.String(255)))
+    op.add_column('zuul_buildset', sa.Column('newrev', sa.String(255)))
+
+
+def downgrade():
+    op.drop_column('zuul_buildset', 'newrev')
+    op.drop_column('zuul_buildset', 'oldrev')

zuul/driver/sql/sqlconnection.py

@@ -91,6 +91,8 @@ class SQLConnection(BaseConnection):
             sa.Column('change', sa.Integer, nullable=True),
             sa.Column('patchset', sa.Integer, nullable=True),
             sa.Column('ref', sa.String(255)),
+            sa.Column('oldrev', sa.String(255)),
+            sa.Column('newrev', sa.String(255)),
             sa.Column('ref_url', sa.String(255)),
             sa.Column('result', sa.String(255)),
             sa.Column('message', sa.TEXT()),

zuul/driver/sql/sqlreporter.py

@@ -36,6 +36,8 @@ class SQLReporter(BaseReporter):
             change = getattr(item.change, 'number', '')
             patchset = getattr(item.change, 'patchset', '')
             ref = getattr(item.change, 'ref', '')
+            oldrev = getattr(item.change, 'oldrev', '')
+            newrev = getattr(item.change, 'newrev', '')
             buildset_ins = self.connection.zuul_buildset_table.insert().values(
                 zuul_ref=item.current_build_set.ref,
                 pipeline=item.pipeline.name,
@@ -43,6 +45,8 @@ class SQLReporter(BaseReporter):
                 change=change,
                 patchset=patchset,
                 ref=ref,
+                oldrev=oldrev,
+                newrev=newrev,
                 ref_url=item.change.url,
                 result=item.current_build_set.result,
                 message=self._formatItemReport(