Change in absolute_reverse breaks netbooting on installed MAAS

The reason the change was made, was because absolute_reverse was getting the incorrect value when being called from a different thread.

the django reverse() call is the issue, not urljoin, so bzr 2837 needs to be reverted.

main thread: /MAAS/images-stream/streams/v1/index.json
new thread: /images-stream/streams/v1/index.json

we need to sort out why from another thread it gets a different result

Can you be more specific in your problem description? If the exact cause is not clear, it's OK to say so. If you don't say it, people may come away thinking that you know exactly what's going on and just aren't explaining it very well. Which may preempt the very discussion and investigation that's needed to get to the right solution.

The issue is that

get_script_prefix() returns '/MAAS/' when running in a django thread.

get_script_prefix() returns '/' when running in an other thread, this breaks the result that reverse returns.

try it:

import threading
from django.core.urlresolvers import get_script_prefix

print(get_script_prefix())
def thread_print():
     print(get_script_prefix())
t = threading.Thread(target=thread_print)
t.start()
t.join()

how to make get_script_prefix to return the correct value in a thread, is unknown to me.