common.load_config(): Don't fail when curdir is not traversable.

Path().joinpath('config.yml').exists() raises an exception when the
process doesn't have permission to traverse the current directory.  This
is the case, in particular, when running webmap-* as another user via
sudo while in the “normal” home directory.

1 files changed, 5 insertions, 3 deletions

diff --git a/common.py b/common.py
index e1c13ab..247e733 100644
--- a/common.py
+++ b/common.py
@@ -48,10 +48,12 @@ def load_config(path=None, groupnames=None):
         for p in [Path(),
                   Path(xdg_config_home).joinpath('webmap'),
                   PosixPath('/etc').joinpath('webmap')]:
-            p = p.joinpath('config.yml')
-            if p.exists():
-                path = str(p)
+            p = str(p.joinpath('config.yml'))
+            if os.path.exists(p):
+                path = p
                 break
+    if path is None:
+        raise Exception('Could not find configuration file')
     with open(path, 'r') as fp:
         config = yaml.safe_load(fp)
     layers = config.get('layers', {})