Mailman: Preventing Duplicate Archiving and Multiple Subject Prefixes with Umbrella Lists
This defines the process of deleting any existing X-No-Archive and X-No-Subject-Prefix headers to prevent duplication, followed by the addition of an X-No-Archive: Yes header and an X-No-Subject-Prefix: Yes header.
~mailman/Mailman/Handlers/Umbrella.py:
def process(mlist, msg, msgdata):
del msg['x-no-archive']
msg['X-No-Archive'] = 'Yes'
del msg['x-no-subject-prefix']
msg['X-No-Subject-Prefix'] = 'Yes'
del msg['x-no-archive']
msg['X-No-Archive'] = 'Yes'
del msg['x-no-subject-prefix']
msg['X-No-Subject-Prefix'] = 'Yes'
The following then inserts that handler into the message pipeline after archiving so that when a message is archived once (in the first list it hits) it is marked not to be archived again in any subsequent lists it is sent to.
~mailman/Mailman/mm_cfg.py:
GLOBAL_PIPELINE.insert(GLOBAL_PIPELINE.index('AfterDelivery'), 'Umbrella')
Mailman doesn’t archive messages containing an X-No-Archive header, however it doesn’t know about the X-No-Subject-Prefix header, so we have to tell it in ~mailman/Mailman/Handlers/CookHeaders.py:
Patch
*** CookHeaders.py.old 2007-09-21 10:33:33.000000000 +0100
--- CookHeaders.py 2007-09-21 10:10:38.000000000 +0100
***************
*** 217,224 ****
--- 217,226 ----
def prefix_subject(mlist, msg, msgdata):
# Add the subject prefix unless the message is a digest or is being fast
# tracked (e.g. internally crafted, delivered to a single user such as the
# list admin).
+ if msg.has_key('x-no-subject-prefix') and msg.get('x-no-subject-prefix', '').lower() == 'yes':
+ return
prefix = mlist.subject_prefix
subject = msg.get('subject', '')
# Try to figure out what the continuation_ws is for the header
if isinstance(subject, Header):
--- CookHeaders.py 2007-09-21 10:10:38.000000000 +0100
***************
*** 217,224 ****
--- 217,226 ----
def prefix_subject(mlist, msg, msgdata):
# Add the subject prefix unless the message is a digest or is being fast
# tracked (e.g. internally crafted, delivered to a single user such as the
# list admin).
+ if msg.has_key('x-no-subject-prefix') and msg.get('x-no-subject-prefix', '').lower() == 'yes':
+ return
prefix = mlist.subject_prefix
subject = msg.get('subject', '')
# Try to figure out what the continuation_ws is for the header
if isinstance(subject, Header):
Hi there, this is really good stuff, I’m getting really annoyed at the duplicate subject prefixes when using umbrella lists. But… I cant find Umbrella.Py in my Handlers dir…
Ah, now I get it, you mean create Umbrella.Py…? I’m trying this now and get this error:
ImportError: No module named Umbrella
@svante
Did you restart Mailman after making the modifications? I believe it creates the pyc files at startup but I could be wrong. It’s been quite a while since I made these modifications (2 years in fact).