Clarified Ansible installation instructions and added slacknotification.py script.

devops/slacknotification.py

@@ -0,0 +1,41 @@
+import os
+from slackclient import SlackClient
+import argparse
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description="Slack notification script")
+    parser.add_argument('--channel','-c', required=True, help="Slack channel.")
+    parser.add_argument('--message','-m', required=True, help="The message to send.")
+    parser.add_argument('--username', required=False, help="Username used on Slack")
+    parser.add_argument('--api_token', required=False, help="Slack API token. Can be set in SLACK_API_TOKEN environment variable too.")
+    parser.add_argument('--icon_emoji','-i', required=False, help="Icon for the message.")
+    args = parser.parse_args()
+
+    username = args.username
+    api_token=args.api_token
+    if api_token is None:
+        api_token=os.getenv("SLACK_API_TOKEN")
+    message = args.message
+    channel = args.channel
+    icon_emoji = args.icon_emoji
+
+    slack_client = SlackClient(api_token)
+    apitest = slack_client.api_call("api.test")
+    if not apitest['ok']:
+        raise ValueError("api.test error: {0}".format(apitest['error']))
+
+    authtest = slack_client.api_call("auth.test")
+    if not authtest['ok']:
+        raise ValueError("auth.test error: {0}".format(authtest['error']))
+
+    if username is None:
+        username = authtest['user']
+
+    if icon_emoji is None:
+        result = slack_client.api_call("chat.postMessage", channel=channel, text=message, username=username, icon_emoji=icon_emoji)
+    else:
+        result = slack_client.api_call("chat.postMessage", channel=channel, text=message, username=username)
+
+    if not result['ok']:
+        raise ValueError("Message error: {0}".format(result['error']))
+