Fix: log handline (not by default) and tmp handling (ok to not have)

1 files changed, 6 insertions, 5 deletions

diff --git a/fable.py b/fable.py
index 8e14357..bee5ce4 100644
--- a/fable.py
+++ b/fable.py
@@ -50,10 +50,11 @@ class Datadir:
         return self._dirname
 
     def set(self, dirname):
-        self._dirname = os.path.abspath(dirname)
-        if not os.path.exists(self._dirname):
-            os.mkdir(self._dirname)
-        self._ours = False
+        if dirname is not None:
+            self._dirname = os.path.abspath(dirname)
+            if not os.path.exists(self._dirname):
+                os.mkdir(self._dirname)
+            self._ours = False
 
     def cleanup(self):
         if self._ours:
@@ -74,7 +75,7 @@ class Run:
 
     def _parse_options(self):
         p = argparse.ArgumentParser()
-        p.add_argument('--log')
+        p.add_argument('--log', default='/dev/null')
         p.add_argument('--tempdir')
         p.add_argument(
             '--scenario', '-s', action='append', dest='scenarios', default=[])