Warn if clients have different boot modes

Show user, when attempting to change the bootmode of more than one
client with different boot modes, a warning and a table with said
bootmodes.

ogcp/templates/actions/mode.html

@@ -15,6 +15,32 @@
   {{ _('Changing boot mode of %(ip_count)d computer(s)', ip_count=ip_count) }}
 </h1>
 
+{% if modes_set|length > 1 %}
+    <h3 class="text-danger">WARNING</h3>
+    <p>Selected clients have different boot modes set</p>
+
+    <table class="table table-hover">
+    <thead class="thead-light">
+	<tr>
+	    <th>Boot modes</th>
+	    <th>Clients</th>
+	</tr>
+    </thead>
+    <tbody class="text-left">
+    {% for mode, clients in modes_set.items() %}
+	<tr>
+	    <th>{{mode}}</th>
+	    <td>
+	    {% for client in clients %}
+	    {{client}}
+	    {% endfor %}
+	    </td>
+	</tr>
+    {% endfor %}
+    </tbody>
+    </table>
+{% endif %}
+
 {{ macros.cmd_selected_clients(selected_clients) }}
 
 {{ wtf.quick_form(form,

ogcp/views.py

@@ -1172,6 +1172,19 @@ def action_client_delete():
         else:
             return redirect(url_for('scopes'))
 
+def get_clients_modes(ips, server):
+    modes = {}
+    for ip in ips:
+        r = server.get('/client/info', payload={"client": [ip]})
+        resp = r.json()
+        current_boot = resp['boot']
+        client_name = resp['name']
+        if current_boot not in modes:
+            modes[current_boot] = [client_name]
+        else:
+            modes[current_boot].append(client_name)
+    return modes
+
 @app.route('/action/mode', methods=['GET', 'POST'])
 @login_required
 def action_mode():
@@ -1195,6 +1208,7 @@ def action_mode():
             return redirect(url_for('commands'))
 
         server = get_server_from_clients(ips)
+        modes_set = get_clients_modes(ips, server)
         r = server.get('/mode')
         available_modes = [(mode, mode) for mode in r.json()['modes']]
         form.boot.choices = list(available_modes)
@@ -1204,7 +1218,7 @@ def action_mode():
         selected_clients = list(get_selected_clients(scopes['scope']).items())
         return render_template('actions/mode.html', form=form, scopes=scopes,
                                selected_clients=selected_clients,
-                               clients=clients)
+                               clients=clients, modes_set=modes_set)
 
 
 @app.route('/action/oglive', methods=['GET', 'POST'])