Change default value for 'mirror_dir' config option

asv/config.py

@@ -29,7 +29,7 @@ def __init__(self):
         self.benchmark_dir = "benchmarks"
         self.results_dir = "results"
         self.html_dir = "html"
-        self.mirror_dir = "project"
+        self.mirror_dir = None
         self.show_commit_url = "#"
         self.hash_length = 8
         self.environment_type = None
@@ -71,6 +71,9 @@ def from_json(cls, d):
             raise util.UserError(
                 "No branches specified in config file.")
 
+        if not getattr(conf, "mirror_dir", None):
+            conf.mirror_dir = conf.project
+
         return conf
 
     @classmethod

asv/template/asv.conf.json

@@ -55,7 +55,7 @@
     // "env_dir": "env",
 
     // The directory (relative to the current directory) to put the repository
-    // mirror. If not provided, defaults to "project"
+    // mirror. If not provided, defaults to the value of "project".
     // "mirror_dir": "project",
 
     // The directory (relative to the current directory) that raw benchmark

docs/source/asv.conf.json.rst

@@ -142,7 +142,7 @@ environments in.  If not provided, defaults to ``"env"``.
 ``mirror_dir``
 -----------
 The directory, relative to the current directory, to put a mirror of
-the repository in.  If not provided, defaults to ``"project"``.
+the repository in.  If not provided, defaults to *project*.
 
 ``results_dir``
 ---------------

test/test_conf.py

@@ -25,6 +25,7 @@ def test_config():
     }
     assert conf.benchmark_dir == 'benchmark'
     assert conf.branches == [None]
+    assert conf.mirror_dir == conf.project   # default value
 
 
 class CustomCommand(Command):