5 files changed, 123 insertions, 0 deletions
diff --git a/mediagoblin/db/migration_tools.py b/mediagoblin/db/migration_tools.py
index 1967dacd..2d7b999a 100644
--- a/mediagoblin/db/migration_tools.py
+++ b/mediagoblin/db/migration_tools.py
@@ -16,6 +16,12 @@
 
 from __future__ import unicode_literals
 
+import os
+
+from alembic import command
+from alembic.config import Config
+
+from mediagoblin.db.base import Base
 from mediagoblin.tools.common import simple_printer
 from sqlalchemy import Table
 from sqlalchemy.sql import select
@@ -24,6 +30,29 @@ class TableAlreadyExists(Exception):
     pass
 
 
+class AlembicMigrationManager(object):
+
+    def __init__(self, session):
+        root_dir = os.path.abspath(os.path.dirname(os.path.dirname(
+            os.path.dirname(__file__))))
+        alembic_cfg_path = os.path.join(root_dir, 'alembic.ini')
+        self.alembic_cfg = Config(alembic_cfg_path)
+        self.session = session
+
+    def init_tables(self):
+        Base.metadata.create_all(self.session.bind)
+        # load the Alembic configuration and generate the
+        # version table, "stamping" it with the most recent rev:
+        command.stamp(self.alembic_cfg, 'head')
+
+    def init_or_migrate(self, version='head'):
+        # TODO(berker): Check this
+        # http://alembic.readthedocs.org/en/latest/api.html#alembic.migration.MigrationContext
+        # current_rev = context.get_current_revision()
+        # Call self.init_tables() first if current_rev is None?
+        command.upgrade(self.alembic_cfg, version)
+
+
 class MigrationManager(object):
     """
     Migration handling tool.
diff --git a/mediagoblin/db/migrations/README b/mediagoblin/db/migrations/README
new file mode 100644
index 00000000..98e4f9c4
--- /dev/null
+++ b/mediagoblin/db/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
+\ No newline at end of file
diff --git a/mediagoblin/db/migrations/env.py b/mediagoblin/db/migrations/env.py
new file mode 100644
index 00000000..712b6164
--- /dev/null
+++ b/mediagoblin/db/migrations/env.py
@@ -0,0 +1,71 @@
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = None
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    engine = engine_from_config(
+                config.get_section(config.config_ini_section),
+                prefix='sqlalchemy.',
+                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(
+                connection=connection,
+                target_metadata=target_metadata
+                )
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
+
diff --git a/mediagoblin/db/migrations/script.py.mako b/mediagoblin/db/migrations/script.py.mako
new file mode 100644
index 00000000..95702017
--- /dev/null
+++ b/mediagoblin/db/migrations/script.py.mako
@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/mediagoblin/db/migrations/versions/.gitkeep b/mediagoblin/db/migrations/versions/.gitkeep
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/mediagoblin/db/migrations/versions/.gitkeep