fix remote task execution

* Fix an accidentally committed syntax error in task.yml
* Vastly improve the argument parsing situation, now you can just pass in all of the arguments as you would to launch-task, and remote-task will pass those through.

edx/analytics/tasks/remote.py

-"""Remote Task
-
-Usage: 
-  remote-task [--job-flow-id=ID] [--branch=BRANCH] [--repo=REPO] [--name=NAME] [--verbose] [<launch-task-args>]
-
-Options:
-  --job-flow-id=ID      EMR job flow to run the task
-  --branch=BRANCH       git branch to checkout before running the task [default: release]
-  --repo=REPO           git repository to clone
-  --name=NAME           an identifier for this task
-  --verbose             display very verbose output
-  <launch-task-args>    a single-quoted string of arguments to pass-through to launch-task on the remote machine
-"""
-
 
+import argparse
 import os
 from subprocess import Popen
 import sys
 import uuid
 
-from docopt import docopt
-
 
 def main():
-    arguments = docopt(__doc__)
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--job-flow-id', help='EMR job flow to run the task')
+    parser.add_argument('--branch', help='git branch to checkout before running the task', default='release')
+    parser.add_argument('--repo', help='git repository to clone')
+    parser.add_argument('--remote-name', help='an identifier for this remote task')
+    parser.add_argument('--verbose', action='store_true', help='display very verbose output')
+    arguments, extra_args = parser.parse_known_args()
+    arguments.launch_task_arguments = extra_args
 
     change_directory_to_ansible_script_home()
 
     extra_vars = convert_cli_arguments_to_ansible_extra_vars(arguments)
     
-    run_ansible_playbook(arguments.get('--verbose', False), extra_vars)
+    run_ansible_playbook(arguments.verbose, extra_vars)
 
 
 def change_directory_to_ansible_script_home():
@@ -36,15 +28,15 @@ def change_directory_to_ansible_script_home():
 
 
 def convert_cli_arguments_to_ansible_extra_vars(arguments):
-    uid = arguments.get('--name') or str(uuid.uuid4())
+    uid = arguments.remote_name or str(uuid.uuid4())
     extra_vars = {
-        'name': arguments['--job-flow-id'],
-        'branch': arguments.get('--branch', 'release'),
-        'task_arguments': arguments.get('<launch-task-args>', '') + ' >/tmp/{0}.out 2>/tmp/{0}.err'.format(uid),
+        'name': arguments.job_flow_id,
+        'branch': arguments.branch,
+        'task_arguments': ' '.join(arguments.launch_task_arguments) + ' >/tmp/{0}.out 2>/tmp/{0}.err'.format(uid),
         'uuid': uid,
     }
-    if arguments['--repo']:
-        extra_vars['repo'] = arguments['--repo']
+    if arguments.repo:
+        extra_vars['repo'] = arguments.repo
     return ' '.join(["{}='{}'".format(k, extra_vars[k]) for k in extra_vars])
 
 
@@ -60,7 +52,6 @@ def run_ansible_playbook(verbose, extra_vars):
     env.update({
         'ANSIBLE_SSH_ARGS': '-o ForwardAgent=yes'
     })
-
     with open('/dev/null', 'rw') as devnull:
         proc = Popen(command, stdin=devnull, env=env)
         proc.communicate()

requirements/default.txt

@@ -4,6 +4,5 @@ pbr==0.5.23
 stevedore==0.13
 tornado==3.1.1
 ansible==1.4.4
-docopt==0.6.1
 
 -e git+https://github.com/spotify/luigi.git@a33756c781b9bf7e51384f0eb19d6a25050ef136#egg=luigi

share/task.yml

@@ -21,7 +21,7 @@
     - task_arguments: ''
     - git_server_hostname: github.com
     - git_server_ip_address: 207.97.227.239
-    - git_server_public_key: 'ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==''
+    - git_server_public_key: 'ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ=='
 
   tasks:
     - name: known_hosts file exists