Add -b/--enable-beta option for enabling beta functionalities.

cdist/config.py

@@ -71,6 +71,8 @@ def inspect_ssh_mux_opts():
 class Config(object):
     """Cdist main class to hold arbitrary data"""
 
+    BETA_ARGS = ['jobs']
+
     def __init__(self, local, remote, dry_run=False, jobs=None):
 
         self.local = local
@@ -109,6 +111,19 @@ class Config(object):
                 for host in source:
                     yield host
 
+    @classmethod
+    def _check_beta(cls, args_dict):
+        if 'beta' not in args_dict:
+            args_dict['beta'] = False
+        # Check only if beta is not enabled: if beta option is specified then
+        # raise error.
+        if not args_dict['beta']:
+            err_msg = ("\'{}\' is beta, but beta is not enabled. If you want "
+                       "to use it please enable beta functionalities.")
+            for arg in cls.BETA_ARGS:
+                if arg in args_dict:
+                    raise cdist.Error(err_msg.format(arg))
+
     @classmethod
     def commandline(cls, args):
         """Configure remote system"""
@@ -120,6 +135,10 @@ class Config(object):
         if args.manifest == '-' and args.hostfile == '-':
             raise cdist.Error(("Cannot read both, manifest and host file, "
                                "from stdin"))
+
+        args_dict = vars(args)
+        cls._check_beta(args_dict)
+
         # if no host source is specified then read hosts from stdin
         if not (args.hostfile or args.host):
             args.hostfile = '-'
@@ -148,7 +167,6 @@ class Config(object):
         args.remote_exec_pattern = None
         args.remote_copy_pattern = None
 
-        args_dict = vars(args)
         # if remote-exec and/or remote-copy args are None then user
         # didn't specify command line options nor env vars:
         # inspect multiplexing options for default cdist.REMOTE_COPY/EXEC

docs/changelog

@@ -1,7 +1,8 @@
 Changelog
 ---------
 next:
-	* Core: Add -j, --jobs option for parallel execution and add parallel support for global explorers (Darko Poljak)
+	* Core: Add -b, --enable-beta option for enabling beta functionalities (Darko Poljak)
+	* Core: Add -j, --jobs option for parallel execution and add parallel support for global explorers (currently in beta) (Darko Poljak)
 	* Core: Add derived env vars for target hostname and fqdn (Darko Poljak)
 	* New type: __keyboard: Set keyboard layout (Carlos Ortigoza)
 	* Documentation: Re-license types' man pages to GPLV3+ (Dmitry Bogatov,	Darko Poljak)

docs/src/man1/cdist.rst

@@ -17,7 +17,7 @@ SYNOPSIS
 
     cdist config [-h] [-d] [-v] [-c CONF_DIR] [-f HOSTFILE] [-i MANIFEST]
                  [-n] [-o OUT_PATH] [-p] [-s] [--remote-copy REMOTE_COPY]
-                 [--remote-exec REMOTE_EXEC] [-j [JOBS]]
+                 [--remote-exec REMOTE_EXEC] [-j [JOBS]] [-b]
                  [host [host ...]]
 
     cdist shell [-h] [-d] [-v] [-s SHELL]
@@ -110,7 +110,12 @@ Configure one or more hosts.
 .. option:: -j [JOBS], --jobs [JOBS]
 
     Specify the maximum number of parallel jobs; currently only
-    global explorers are supported
+    global explorers are supported (currently in beta)
+
+.. option:: -b, --enable-beta
+
+    Enable beta functionalities. Beta functionalities include the
+    following options: -j/--jobs.
 
 SHELL
 -----

scripts/cdist

@@ -122,10 +122,15 @@ def commandline():
            default=os.environ.get('CDIST_REMOTE_EXEC'))
     parser['config'].add_argument(
            '-j', '--jobs', nargs='?', type=check_positive_int,
-           help=('Specify the maximum number of parallel jobs; currently '
-                 'only global explorers are supported'),
+           help=('Specify the maximum number of parallel jobs, currently '
+                 'only global explorers are supported (currently in beta'),
            action='store', dest='jobs',
            const=multiprocessing.cpu_count())
+    parser['config'].add_argument(
+           '-b', '--enable-beta',
+           help=('Enable beta functionalities. Beta functionalities '
+                 'include the following options: -j/--jobs.'),
+           action='store_true', dest='beta', default=False)
     parser['config'].set_defaults(func=cdist.config.Config.commandline)
 
     # Shell