new introducer: signed extensible dictionary-based messages! refs #466

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / node.py

diff --git a/src/allmydata/node.py b/src/allmydata/node.py
index 0b8436502790e7f45ef59990dd792823e3ba2b6a..06b707de1c50d86804a208a97e8657ea87cb3572 100644 (file)
--- a/src/allmydata/node.py
+++ b/src/allmydata/node.py
@@ -195,6 +195,19 @@ class Node(service.MultiService):
         # TODO: merge this with allmydata.get_package_versions
         return dict(app_versions.versions)
 
+    def get_config_from_file(self, name, required=False):
+        """Get the (string) contents of a config file, or None if the file
+        did not exist. If required=True, raise an exception rather than
+        returning None. Any leading or trailing whitespace will be stripped
+        from the data."""
+        fn = os.path.join(self.basedir, name)
+        try:
+            return fileutil.read(fn).strip()
+        except EnvironmentError:
+            if not required:
+                return None
+            raise
+
     def write_private_config(self, name, value):
         """Write the (string) contents of a private config file (which is a
         config file that resides within the subdirectory named 'private'), and