report full path for env.py

2 files changed, 9 insertions, 2 deletions

diff --git a/alembic/autogenerate.py b/alembic/autogenerate.py
index bae14af..acb61d8 100644
--- a/alembic/autogenerate.py
+++ b/alembic/autogenerate.py
@@ -2,6 +2,7 @@
 automatically."""
 
 from alembic.context import _context_opts, get_bind, get_context
+from alembic import context
 from alembic import util
 from sqlalchemy.engine.reflection import Inspector
 from sqlalchemy import schema, types as sqltypes
@@ -18,8 +19,10 @@ def produce_migration_diffs(template_args, imports):
     if metadata is None:
         raise util.CommandError(
                 "Can't proceed with --autogenerate option; environment "
-                "script env.py does not provide "
-                "a MetaData object to the context.")
+                "script %s does not provide "
+                "a MetaData object to the context." % (
+                    context._script.env_py_location
+                ))
     connection = get_bind()
     diffs = []
     autogen_context = {
diff --git a/alembic/script.py b/alembic/script.py
index 4c31c2b..bb450ca 100644
--- a/alembic/script.py
+++ b/alembic/script.py
@@ -115,6 +115,10 @@ class ScriptDirectory(object):
         """
         util.load_python_file(self.dir, 'env.py')
 
+    @property
+    def env_py_location(self):
+        return os.path.abspath(os.path.join(self.dir, "env.py"))
+
     @util.memoized_property
     def _revision_map(self):
         map_ = {}