diff options
| -rw-r--r-- | pkg_resources/__init__.py | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py index c3686f88..4e820c09 100644 --- a/pkg_resources/__init__.py +++ b/pkg_resources/__init__.py @@ -798,13 +798,16 @@ class WorkingSet(object): ws = WorkingSet([]) dist = best[req.key] = env.best_match(req, ws, installer) if dist is None: - #msg = ("The '%s' distribution was not found on this " - # "system, and is required by this application.") - #raise DistributionNotFound(msg % req) - - # unfortunately, zc.buildout uses a str(err) - # to get the name of the distribution here.. - raise DistributionNotFound(req) + requirers = required_by.get(req, None) + if requirers: + requirers_str = ', '.join(requirers) + else: + requirers_str = 'this application' + msg = ("The '%s' distribution was not found " + "and is required by %s." + % (req, requirers_str)) + warnings.warn(msg) + raise DistributionNotFound(msg) to_activate.append(dist) if dist not in req: # Oops, the "best" so far conflicts with a dependency |