issue #301: support expandvars() for remote_tmp only.

Vanilla Ansible support expandvars-like expansions widely in a variety
of places. Prefer to whitelist those we need, rather than sprinkling
hellish semantics everywhere.

ansible_mitogen/target.py

@@ -407,6 +407,9 @@ def make_temp_directory(base_dir):
     :returns:
         Newly created temporary directory.
     """
+    # issue #301: remote_tmp may contain $vars.
+    base_dir = os.path.expandvars(base_dir)
+
     if not os.path.exists(base_dir):
         os.makedirs(base_dir, mode=int('0700', 8))
     return tempfile.mkdtemp(

tests/ansible/ansible.cfg

@@ -17,8 +17,9 @@ timeout = 10
 # On Travis, paramiko check fails due to host key checking enabled.
 host_key_checking = False
 
-# Required by integration/runner__remote_tmp.yml
+# "mitogen-tests" required by integration/runner/remote_tmp.yml
-remote_tmp = ~/.ansible/mitogen-tests/
+# "$HOME" required by integration/action/make_tmp_path.yml
+remote_tmp = $HOME/.ansible/mitogen-tests/
 
 [ssh_connection]
 ssh_args = -o ForwardAgent=yes -o ControlMaster=auto -o ControlPersist=60s