Use package framework for installing ejabberd and jwchat

actions/xmpp

@@ -38,10 +38,6 @@ def parse_arguments():
     parser = argparse.ArgumentParser()
     subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
 
-    # Get whether ejabberd is installed
-    subparsers.add_parser('get-installed',
-                          help='Get whether ejabberd is installed')
-
     # Prepare ejabberd for hostname change
     pre_hostname_change = subparsers.add_parser(
         'pre-change-hostname',
@@ -77,17 +73,8 @@ def parse_arguments():
     return parser.parse_args()
 
 
-def subcommand_get_installed(_):
-    """Get whether ejabberd is installed"""
-    print('installed' if get_installed() else 'not installed')
-
-
 def subcommand_pre_change_hostname(arguments):
     """Prepare ejabberd for hostname change"""
-    if not get_installed():
-        print('Failed to update XMPP hostname: ejabberd is not installed.')
-        return
-
     old_hostname = arguments.old_hostname
     new_hostname = arguments.new_hostname
 
@@ -104,10 +91,6 @@ def subcommand_pre_change_hostname(arguments):
 
 def subcommand_change_hostname(arguments):
     """Update ejabberd and jwchat with new hostname"""
-    if not get_installed():
-        print('Failed to update XMPP hostname: ejabberd is not installed.')
-        return
-
     subprocess.call(['service', 'ejabberd', 'stop'])
     subprocess.call(['pkill', '-u', 'ejabberd'])
 
@@ -134,10 +117,6 @@ def subcommand_change_hostname(arguments):
 
 def subcommand_change_domainname(arguments):
     """Update ejabberd and jwchat with new domainname"""
-    if not get_installed():
-        print('Failed to update XMPP domainname: ejabberd is not installed.')
-        return
-
     domainname = arguments.domainname
     fqdn = socket.gethostname() + '.' + domainname
 
@@ -172,10 +151,6 @@ def subcommand_change_domainname(arguments):
 
 def subcommand_register(arguments):
     """Register a new user account"""
-    if not get_installed():
-        print('Failed to register XMPP account: ejabberd is not installed.')
-        return
-
     username = arguments.username
     password = arguments.password
     fqdn = socket.getfqdn()
@@ -188,14 +163,6 @@ def subcommand_register(arguments):
         print('Failed to register XMPP account:', e.output.decode())
 
 
-def get_installed():
-    """Check if ejabberd is installed"""
-    with open('/dev/null', 'w') as file_handle:
-        status = subprocess.call(['which', 'ejabberdctl'], stdout=file_handle)
-
-    return not status
-
-
 def main():
     """Parse arguments and perform all duties"""
     arguments = parse_arguments()

plinth/modules/xmpp/templates/xmpp.html

@@ -22,8 +22,6 @@
 
 {% block content %}
 
-{% if is_installed %}
-
 <p>XMPP is an open and standardized communication protocol.  Here you
   can run and configure your XMPP server, called ejabberd.  To actually
   communicate, you can use the <a href='/jwchat'>web client</a> or any
@@ -33,16 +31,4 @@
 <p><a href='/jwchat' target='_blank'class='btn btn-primary'> Launch web
   client</a></p>
 
-{% else %}
-
-<h2>XMPP Server</h2>
-
-<p>The XMPP server <i>ejabberd</i> is not installed.</p>
-
-<p>ejabberd comes pre-installed with {{ cfg.box_name }}. On any Debian-based
-  system (such as {{ cfg.box_name }}) you may install it using the command
-  <code>aptitude install ejabberd</code>.</p>
-
-{% endif %}
-
 {% endblock %}

plinth/modules/xmpp/xmpp.py

@@ -25,6 +25,7 @@ import logging
 
 from plinth import actions
 from plinth import cfg
+from plinth import package
 from plinth import service
 from plinth.signals import pre_hostname_change, post_hostname_change
 from plinth.signals import domainname_change
@@ -61,21 +62,12 @@ def init():
 
 
 @login_required
+@package.required('jwchat', 'ejabberd')
 def index(request):
     """Serve XMPP page"""
-    is_installed = actions.superuser_run(
-        'xmpp',
-        ['get-installed']).strip() == 'installed'
-
-    if is_installed:
-        index_subsubmenu = subsubmenu
-    else:
-        index_subsubmenu = None
-
     return TemplateResponse(request, 'xmpp.html',
                             {'title': _('XMPP Server'),
-                             'is_installed': is_installed,
-                             'subsubmenu': index_subsubmenu})
+                             'subsubmenu': subsubmenu})
 
 
 class ConfigureForm(forms.Form):  # pylint: disable-msg=W0232