local: Create the repository in prepare_repo

We won't be able to set metadata on a repository before we've created
it.  So do that in prepare_repo instead of deferring it to Lorry.
This requires adding an application setting for the base directory.

Also update the method doc-string so the old lazy behaviour is not
allowed.

2 files changed, 29 insertions, 7 deletions

diff --git a/lorrycontroller/hosts.py b/lorrycontroller/hosts.py
index b86cbad..39cae57 100644
--- a/lorrycontroller/hosts.py
+++ b/lorrycontroller/hosts.py
@@ -40,10 +40,10 @@ class DownstreamHost(abc.ABC):
 
     @abc.abstractmethod
     def prepare_repo(self, repo_path, metadata):
-        '''Prepare a repository on the Host.  If the repository does not exist
-        and Lorry won't automatically create it, this method must create the
-        repository.  It should also set any given metadata on the repository,
-        whether or not it already exists.
+        '''Prepare a repository on the Host.  If the repository does not
+        exist, this method must create it.  It should also set any
+        given metadata on the repository, whether or not it already
+        exists.
 
         repo_path is the path that the repository should appear at
         within the Host.
diff --git a/lorrycontroller/local.py b/lorrycontroller/local.py
index 101bc98..15a4048 100644
--- a/lorrycontroller/local.py
+++ b/lorrycontroller/local.py
@@ -13,14 +13,36 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+import logging
+import os
+
+import cliapp
+
 from . import hosts
 
 
 class LocalDownstream(hosts.DownstreamHost):
+    @staticmethod
+    def add_app_settings(app_settings):
+        app_settings.string(
+            ['local-base-directory'],
+            'Base directory for local Downstream Host')
+
+    @staticmethod
+    def check_app_settings(app_settings):
+        if not app_settings['local-base-directory']:
+            logging.error('A base directory must be provided to create '
+                          'repositories on a local filesystem.')
+            app_settings.require('local-base-directory')
+
     def __init__(self, app_settings):
-        pass
+        self._base_dir = app_settings['local-base-directory']
 
     def prepare_repo(self, repo_path, metadata):
-        # Lorry can create the repository directly
+        repo_path = '%s/%s.git' % (self._base_dir, repo_path)
+
+        # These are idempotent, so we don't need to explicitly check
+        # whether the repository already exists
+        os.makedirs(repo_path, exist_ok=True)
+        cliapp.runcmd(['git', 'init', '--bare', repo_path])
         # TODO: set metadata
-        pass