-p has been replaced by a required option. Various docs changes.

README.md

@@ -66,22 +66,22 @@ Example:
     192.168.10.52
 
 When running ansible commands, specific hosts are addressed by wildcard or group name. 
-The default pattern is '*', meaning all ansible hosts.
+This is required for all ansible commands.
 
-    -p '*.example.com'
+    '*.example.com'
-    -p 'atlanta;raleigh'
+    'atlanta;raleigh'
-    -p 'database*;appserver*'
+    'database*;appserver*'
-    -p '192.168.10.50;192.168.10.52'
+    '192.168.10.50;192.168.10.52'
 
 Example: Massive Parallelism and Running Shell Commands
 =======================================================
 
 Reboot all web servers in Atlanta, 10 at a time:
  
-    ssh-agent bash
+    > ssh-agent bash
-    ssh-add ~/.ssh/id_rsa.pub
+    > ssh-add ~/.ssh/id_rsa.pub
 
-    ansible -p "atlanta-web*" -f 10 -n command -a "/sbin/reboot"
+    > ansible atlanta -a "/sbin/reboot" -f 10
 
 The -f 10 specifies the usage of 10 simultaneous processes.
 
@@ -98,15 +98,15 @@ them as template sources.
 
 To just transfer a file directly to many different servers:
 
-    ansible -n copy -a "/etc/hosts /tmp/hosts"
+    > ansible atlanta copy -a "/etc/hosts /tmp/hosts"
 
 To use templating, first run the setup module to put the template variables you would
 like to use on the remote host.  Then use the template module to write the
 files using the templates.  Templates are written in Jinja2 format.
 
-    ansible -p webservers -n setup -a "favcolor=red ntp_server=192.168.1.1"
+    > ansible webservers -m setup    -a "favcolor=red ntp_server=192.168.1.1"
-    ansible -p webservers -n template -a "src=/srv/motd.j2 dest=/etc/motd"
+    > ansible webservers -m template -a "src=/srv/motd.j2 dest=/etc/motd"
-    ansible -p webservers -n template -a "src=/srv/ntp.j2 dest=/etc/ntp.conf"
+    > ansible webservers -m template -a "src=/srv/ntp.j2 dest=/etc/ntp.conf"
 
 Need something like the fqdn in a template?  If facter or ohai are installed, data from these projects
 will also be made available to the template engine, using 'facter_' and 'ohai_' prefixes for each.
@@ -116,7 +116,7 @@ Example: Software Deployment From Source Control
 
 Deploy your webapp straight from git
 
-    ansible -p webservers -n git -a "repo=git://foo dest=/srv/myapp version=HEAD"
+    > ansible webservers -m git -a "repo=git://foo dest=/srv/myapp version=HEAD"
 
 Other Modules
 =============

bin/ansible

@@ -38,37 +38,33 @@ class Cli(object):
         pass
 
     def runner(self):
-        parser = OptionParser()
+        parser = OptionParser(usage = 'ansible <host-pattern> [options]')
         parser.add_option("-a", "--args", dest="module_args",
             help="module arguments", default=C.DEFAULT_MODULE_ARGS)
         parser.add_option('-f','--forks', dest='forks', default=C.DEFAULT_FORKS, type='int',
-            help='set the number of forks to start up')
+            help='number of parallel processes to use')
-        parser.add_option("-p", "--host-pattern", dest="hosts",
+        parser.add_option("-i", "--inventory-file", dest="inventory",
-            help="hostname glob or group name", default=C.DEFAULT_PATTERN)
+           help="inventory host file", default=C.DEFAULT_HOST_LIST)
-        parser.add_option("-i", "--inventory", dest="inventory",
-           help="inventory host list", default=C.DEFAULT_HOST_LIST)
         parser.add_option("-k", "--ask-pass", default=False, action="store_true",
-            help="ask the user to input the ssh password for connecting")
+            help="ask for SSH password")
-        parser.add_option("-m", "--module-path", dest="module_path",
+        parser.add_option("-M", "--module-path", dest="module_path",
            help="path to module library", default=C.DEFAULT_MODULE_PATH)
-        parser.add_option("-n", "--name", dest="module_name",
+        parser.add_option("-m", "--module-name", dest="module_name",
-            help="module name to execute", default=None)
+            help="module name to execute", default=C.DEFAULT_MODULE_NAME)
         parser.add_option('-o', '--one-line', dest='one_line', action='store_true',
-            help="try to print output on one line")
+            help="condense output")
         parser.add_option('-t', '--tree', dest='tree', default=None,
-            help="if specified, a directory name to save output to, one file per host")
+            help="log output to this directory")
         parser.add_option('-T', '--timeout', default=C.DEFAULT_TIMEOUT, type='int',
-            dest='timeout', help="set the timeout in seconds for ssh")
+            dest='timeout', help="set the SSH timeout in seconds")
         parser.add_option('-u', '--user', default=C.DEFAULT_REMOTE_USER,
-            dest='remote_user', help='set the default username')
+            dest='remote_user', help='connect as this user')
         options, args = parser.parse_args()
 
-        if options.module_name is None:
+        if len(args) == 0 or len(args) > 1:
-            print >> sys.stderr, "-n is required"
+            parser.print_help()
             sys.exit(1)
-
+        pattern = args[0]
-        # TODO: more shell like splitting on module_args would
-        # be a good idea
 
         sshpass = None
         if options.ask_pass:
@@ -85,7 +81,7 @@ class Cli(object):
             host_list=options.inventory,
             timeout=options.timeout,
             forks=options.forks,
-            pattern=options.hosts,
+            pattern=pattern,
             verbose=True,
         )
         return runner
@@ -95,6 +91,10 @@ class Cli(object):
         # if specifying output destination (aka tree output saves), create the
         # directory to output to
 
+        if results is None:
+           print >> sys.stderr, "No hosts matched"
+           sys.exit(1)
+
         options = self.options
 
         # TODO: split into function 
@@ -117,64 +117,64 @@ class Cli(object):
         
         for hostname in sorted(results['contacted']):
             result    = results['contacted'][hostname]
+            
+            # TODO: refactor
             rc        = 0
+            msg       = ''
             failed    = False
             stdout    = None
             stderr    = None
             traceback = None
-            error     = None
             if type(result) == dict:
                 failed    = result.get('failed', 0)
+                msg       = result.get('msg', '')
                 if module_name == 'command':
+                    # TODO: refactor
                     rc        = result.get('rc',0)
                     stdout    = result.get('stdout', '')
                     stderr    = result.get('stderr', '')
                     traceback = result.get('traceback', '')
-                    error     = result.get('error', '')
-
-            # detect and show failures, if any
-            if rc != 0 or failed:
-                msg = "Error: %s: \n" % hostname
-                if stdout:
-                    msg += stdout
-                if stderr:
-                    msg += stderr
-                if traceback:
-                    msg += traceback
-                if error:
-                    msg += error
-                print >> sys.stderr, msg
-                continue
 
             if options.one_line:
                 # try to print everything on one line, but don't strip newlines
                 # if the command output happend to be too long
                 if module_name == 'command':
-                    msg = "(stdout) %s" % stdout
+                    if not failed:
+                        buf = "(stdout) %s" % stdout
                         if stderr.rstrip() != '':
-                        msg = "(stdout) %s (stderr) %s" % (stdout,stderr)
+                            buf = "(stdout) %s (stderr) %s" % (stdout,stderr)
                         print "%s | rc=%s | %s" % (
-                        hostname, rc, msg
+                            hostname, rc, buf
                         )
+                    else:
+                        print "%s | (error) %s" % (hostname, msg)
                 else:
                     print "%s | %s" % (hostname, result)
             else:
                 # summarize response from command in multiple lines
-                if module_name == 'command':
                 buf = ''
+                if module_name == 'command':
+                    if not failed:
                         buf += "%s | rc=%s >>\n" % (hostname, rc)
+                    else:
+                        buf += "%s | rc=%s | FAILED >>\n" % (hostname, rc)
                     buf += stdout
                     if stderr:
                         buf += stderr
+                    if msg:
+                        buf += msg
                     print buf
+                else:
+                    if not failed:
+                        buf += "%s >>" % hostname
+                    else:
+                        buf += "%s | FAILED >>" % hostname
+                    buf += json.dumps(result, indent=4, sort_keys=True)
                 if options.tree:
                     path = os.path.join(options.tree, hostname)
                     fd = open(path, "w+")
                     fd.write(buf)
                     fd.close()
-                else:
-                    print "%s >>" % hostname
-                    print json.dumps(result, indent=4, sort_keys=True)
 
         if len(results['dark'].keys()) > 0:
             print >> sys.stderr, "*** Hosts which could not be contacted or did not respond: ***"

docs/man/man1/ansible.1.asciidoc

@@ -12,7 +12,7 @@ ansible - run a command somewhere else
 
 SYNOPSIS
 --------
-ansible [-f forks] [-p pattern ] [-n module_name] [-a args]
+ansible <host-pattern> [-f forks] [-m module_name] [-a args]
 
 
 DESCRIPTION
@@ -22,6 +22,15 @@ DESCRIPTION
 SSH.
 
 
+ARGUMENTS
+---------
+
+*hostspec*
+
+A name of a group in the inventory file, a shell-like glob selecting hosts in inventory
+file, or any combination of the two seperated by semicolons.
+
+
 OPTIONS
 -------
 
@@ -36,16 +45,11 @@ Path to the inventory hosts file, which defaults to /etc/ansible/hosts.
 Level of parallelism. Specify as an integer, the default is 5.
 
 
-*-n*, *--name*::
+*-m*, *--module-name*::
 
 Module name to execute.
 
 
-*-a*, *--args*::
-
-Arguments to module, as a single string.  
-
-
 *-p*, *--pattern*::
 
 Hostname pattern. Accepts shell-like globs which can be seperated with ";"
@@ -89,8 +93,9 @@ Ansible is released under the terms of the GPLv3 License.
 SEE ALSO
 --------
 
+Ansible home page: <https://github.com/mpdehaan/ansible/>
+
 *ansible-modules*(5), 
 
 *ansible-playbook*(5),
 
-Ansible home page: <https://github.com/mpdehaan/ansible/>

lib/ansible/constants.py

@@ -19,8 +19,8 @@
 # control side (aka 'overlord')
 DEFAULT_HOST_LIST      = '/etc/ansible/hosts'
 DEFAULT_MODULE_PATH    = '/usr/share/ansible'
-DEFAULT_MODULE_NAME    = 'ping'
+DEFAULT_MODULE_NAME    = 'command'
-DEFAULT_PATTERN        = '*'
+DEFAULT_PATTERN        = None
 DEFAULT_FORKS          = 3
 DEFAULT_MODULE_ARGS    = ''
 DEFAULT_TIMEOUT        = 10

lib/ansible/playbook.py

@@ -152,6 +152,11 @@ class PlayBook(object):
         )
         results = runner.run()
 
+        # if no hosts are matched, carry on, unlike /bin/ansible
+        # which would warn you about this
+        if results is None:
+            results = {}
+ 
         # walk through the results and build up
         # summary information about successes and
         # failures.  TODO: split into subfunction

lib/ansible/runner.py

@@ -326,6 +326,8 @@ class Runner(object):
         
         # find hosts that match the pattern
         hosts = self.match_hosts(self.pattern)
+        if len(hosts) == 0:
+            return None       
  
         # attack pool of hosts in N forks
         # _executor_hook does all of the work

library/command

@@ -45,13 +45,13 @@ try:
 except (OSError, IOError), e:
     print json.dumps({
         "failed": 1,
-        "error": str(e),
+        "msg": str(e),
         })
     sys.exit(1)
 except:
     print json.dumps({
         "failed" : 1,
-        "traceback" : traceback.format_exc()
+        "msg" : traceback.format_exc()
     })   
     sys.exit(1)