Improve error output

django_migration_linter/migration_linter.py

@@ -18,8 +18,8 @@ import os
 import re
 from subprocess import Popen, PIPE
 import sys
-from . import utils
-from .sql_analyser import analyse_sql_statements
+import utils
+from sql_analyser import analyse_sql_statements
 
 
 class MigrationLinter(object):
@@ -139,7 +139,10 @@ class MigrationLinter(object):
             sql_statements.append(line)
         sqlmigrate_process.wait()
         if sqlmigrate_process.returncode != 0:
-            raise RuntimeError('sqlmigrate command failed')
+            out, err = sqlmigrate_process.communicate()
+            print('sqlmigrate command failed')
+            print(err.decode('ascii'))
+            raise RuntimeError()
         log.info('Found {0} sql migration lines'.format(len(sql_statements)))
         return sql_statements