Edward Wildgoose <Edward(_dot_)Wildgoose(_at_)FRMHedge(_dot_)com> wrote:
A quick and easy question: If I have procmail delivering to an MH folder,
and my mail server might deliver multiple local messages simultaneously,
then do I need a lock file?
You are definitely correct that you do need locking. Your delivery
patterns might be such that you always get lucky and never see a collision,
but it's not safe to trust to luck. You will need to specify via procmail
that to make sure you don't get multiple processes trying to update the
.mh_sequences file, lest you be required to edit it manually and remove
bits where 2 delivery processes stepped on each other (which I've had
happen on some of my high volume folders).
I use a scheme like:
#[other common rules for removing subject-tags, etc]
Then making new rules means copying a block [vi: y}P] and editing only the
match pattern and the FOLDER.
Unfortunately, since mh's tools (show, anno, et.al.) don't do any locking,
they might try updating a .mh_sequences file while a delivery is occurring.
I have no general solutioon for that.
Philip Kizer, Senior Lead Systems Engineer, Texas A&M University
USENIX Liaison to Texas A&M University <usenix(_at_)tamu(_dot_)edu>
Texas A&M CIS Operating Systems Group, Unix <pckizer(_at_)tamu(_dot_)edu>
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