Make command warnings off by default to minimize surprises.

CHANGELOG.md

@@ -13,7 +13,7 @@ New core features:
 * 'ansible vault view filename.yml' opens filename.yml decrypted in a pager.
 * no_log parameter now surpressess data from callbacks/output as well as syslog
 * ansible-galaxy install -f requirements.yml allows advanced options and installs from non-galaxy SCM sources and tarballs.
-* command_warnings feature will warn about when usage of the shell/command module can be simplified to use core modules - this can be disabled in ansible.cfg
+* command_warnings feature will warn about when usage of the shell/command module can be simplified to use core modules - this can be enabled in ansible.cfg
 
 New Modules:
 

examples/ansible.cfg

@@ -102,12 +102,13 @@ ansible_managed = Ansible managed: {file} modified on %Y-%m-%d %H:%M:%S by {uid}
 # to disable these warnings, set the following value to False:
 #deprecation_warnings = True
 
-# by default (as of 1.8), Ansible will warn when usage of the shell and
+# (as of 1.8), Ansible can optionally warn when usage of the shell and
 # command module appear to be simplified by using a default Ansible module
 # instead.  These warnings can be silenced by adjusting the following
 # setting or adding warn=yes or warn=no to the end of the command line 
-# parameter string.
+# parameter string.  This will for example suggest using the git module
-# command_warnings = True
+# instead of shelling out to the git command.
+# command_warnings = False
 
 
 # set plugin path directories here, separate with colons

lib/ansible/constants.py

@@ -170,7 +170,7 @@ HOST_KEY_CHECKING              = get_config(p, DEFAULTS, 'host_key_checking',  '
 SYSTEM_WARNINGS                = get_config(p, DEFAULTS, 'system_warnings', 'ANSIBLE_SYSTEM_WARNINGS', True, boolean=True)
 DEPRECATION_WARNINGS           = get_config(p, DEFAULTS, 'deprecation_warnings', 'ANSIBLE_DEPRECATION_WARNINGS', True, boolean=True)
 DEFAULT_CALLABLE_WHITELIST     = get_config(p, DEFAULTS, 'callable_whitelist', 'ANSIBLE_CALLABLE_WHITELIST', [], islist=True)
-COMMAND_WARNINGS               = get_config(p, DEFAULTS, 'command_warnings', 'ANSIBLE_COMMAND_WARNINGS', True, boolean=True)
+COMMAND_WARNINGS               = get_config(p, DEFAULTS, 'command_warnings', 'ANSIBLE_COMMAND_WARNINGS', False, boolean=True)
 
 # CONNECTION RELATED
 ANSIBLE_SSH_ARGS               = get_config(p, 'ssh_connection', 'ssh_args', 'ANSIBLE_SSH_ARGS', None)

library/commands/command

@@ -71,10 +71,9 @@ options:
     version_added: "1.8"
     default: yes
     description:
-      - "turn off warnings about running a command that is provided by an Ansible module, suggesting you should use that module instead. 'Command warnings' can also be turned off globally in ansible.cfg"
+      - if command warnings are on in ansible.cfg, do not warn about this particular line if set to no/false.
     required: false
     default: True
-    version_added: "1.5"
 notes:
     -  If you want to run a command through the shell (say you are using C(<),
        C(>), C(|), etc), you actually want the M(shell) module instead. The

library/commands/shell

@@ -43,10 +43,10 @@ options:
     version_added: "0.9"
   warn:
     description:
-      - turn off warnings about running a command that is provided by an Ansible module.
+      - if command warnings are on in ansible.cfg, do not warn about this particular line if set to no/false.
     required: false
     default: True
-    version_added: "1.5"
+    version_added: "1.8"
 notes:
    -  If you want to execute a command securely and predictably, it may be
       better to use the M(command) module instead. Best practices when writing