Configure location of lock files

Before this commit, moulinette was using lockfiles in /var/run. However
this prevents it to run as non-root user. To allow this and to
facilitate unit testing (typically run as regular user), this commit
adds a MOULINETTE_RUN_DIR env variable.

moulinette/actionsmap.py

@@ -419,6 +419,7 @@ class ActionsMap(object):
         moulinette_env = init_moulinette_env()
         DATA_DIR = moulinette_env["DATA_DIR"]
         CACHE_DIR = moulinette_env["CACHE_DIR"]
+        self.run_dir = moulinette_env["RUN_DIR"]
 
         if len(namespaces) == 0:
             namespaces = self.get_namespaces()
@@ -545,7 +546,7 @@ class ActionsMap(object):
             full_action_name = "%s.%s.%s" % (namespace, category, action)
 
         # Lock the moulinette for the namespace
-        with MoulinetteLock(namespace, timeout):
+        with MoulinetteLock(namespace, timeout, lock_dir=self.run_dir):
             start = time()
             try:
                 mod = __import__(

moulinette/core.py

@@ -454,12 +454,12 @@ class MoulinetteLock(object):
 
     """
 
-    def __init__(self, namespace, timeout=None, interval=0.5):
+    def __init__(self, namespace, timeout=None, interval=0.5, lock_dir="/var/run"):
         self.namespace = namespace
         self.timeout = timeout
         self.interval = interval
 
-        self._lockfile = "/var/run/moulinette_%s.lock" % namespace
+        self._lockfile = "{}/moulinette_{}.lock".format(lock_dir, namespace)
         self._stale_checked = False
         self._locked = False
 

moulinette/globals.py

@@ -11,4 +11,5 @@ def init_moulinette_env():
             "MOULINETTE_LOCALES_DIR", "/usr/share/moulinette/locale"
         ),
         "CACHE_DIR": environ.get("MOULINETTE_CACHE_DIR", "/var/cache/moulinette"),
+        "RUN_DIR": environ.get("MOULINETTE_RUN_DIR", "/var/run")
     }

pytest.ini

@@ -5,3 +5,4 @@ testpaths = test/
 env =
   MOULINETTE_LOCALES_DIR = {PWD}/locales
   TESTS_RUN = True
+  MOULINETTE_RUN_DIR=.