Fixed #632 added alternatives priority (#1175)

system/alternatives.py

@@ -47,6 +47,10 @@ options:
       - The path to the symbolic link that should point to the real executable.
       - This option is required on RHEL-based distributions
     required: false
+  priority:
+    description:
+      - The priority of the alternative
+    required: false
 requirements: [ update-alternatives ]
 '''
 
@@ -56,9 +60,10 @@ EXAMPLES = '''
 
 - name: alternatives link created
   alternatives: name=hadoop-conf link=/etc/hadoop/conf path=/etc/hadoop/conf.ansible
-'''
 
-DEFAULT_LINK_PRIORITY = 50
+- name: make java 32 bit an alternative with low priority
+  alternatives: name=java path=/usr/lib/jvm/java-7-openjdk-i386/jre/bin/java priority=-10
+'''
 
 import re
 from ansible.module_utils.basic import *
@@ -72,6 +77,8 @@ def main():
             name = dict(required=True),
             path = dict(required=True, type='path'),
             link = dict(required=False, type='path'),
+            priority = dict(required=False, type='int',
+                            default=50),
         ),
         supports_check_mode=True,
     )
@@ -80,6 +87,7 @@ def main():
     name = params['name']
     path = params['path']
     link = params['link']
+    priority = params['priority']
 
     UPDATE_ALTERNATIVES = module.get_bin_path('update-alternatives',True)
 
@@ -127,7 +135,7 @@ def main():
                     module.fail_json(msg="Needed to install the alternative, but unable to do so as we are missing the link")
 
                 module.run_command(
-                    [UPDATE_ALTERNATIVES, '--install', link, name, path, str(DEFAULT_LINK_PRIORITY)],
+                    [UPDATE_ALTERNATIVES, '--install', link, name, path, str(priority)],
                     check_rc=True
                 )