Add warnings about using Breezy

We should not recommend using Breezy until we can point to a version
where fast-export is reliable.

* README: describe support for Breezy as experiemntal
* lorry: warn if attempting a Bazaar conversion using 'brz'

Relates to lorry-buildstream#14.

2 files changed, 9 insertions, 3 deletions

diff --git a/README.md b/README.md
index 2db9838..a5845f3 100644
--- a/README.md
+++ b/README.md
@@ -42,9 +42,11 @@ Required:
 
 Optional:
 
-* **bzr-fastimport** or **Breezy**: Needed if you want to import
-  Bazaar (bzr) repositories.  Can be installed as the `bzr-fastimport`
-  or `brz` package in Debian.
+* **bzr-fastimport**: Needed if you want to import Bazaar (bzr)
+  repositories.  Can be installed as the `bzr-fastimport` package in
+  Debian.  It is also possible to use Breezy instead, but this should
+  currently be considered experimental due to bugs in its
+  implementation of `fast-export`.
 
 * **cmdtest**: Needed if you want to run the test suite.  Can be
   installed as the `cmdtest` package in Debian, or from the source at
diff --git a/lorry b/lorry
index 955b46b..1989400 100755
--- a/lorry
+++ b/lorry
@@ -466,6 +466,10 @@ class Lorry(cliapp.Application):
 
     def gitify_bzr(self, project_name, dirname, gitdir, spec):
         bzr = self.settings['bazaar-command']
+        if os.path.basename(bzr) == 'brz':
+            msg = 'Using Breezy for Bazaar conversion, which may not work correctly'
+            logging.warning(msg)
+            self.output.write('%s\n' % msg)
 
         bzrdir = os.path.join(dirname, 'bzr')
         # check if repo exists