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List:       ezmlm
Subject:    Re: migrate from group alias to mailing list
From:       Kyle Wheeler <kyle-ezmlm () memoryhole ! net>
Date:       2009-06-18 22:31:17
Message-ID: 20090618223117.GG6081 () atakapa ! local
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On Thursday, June 18 at 04:36 PM, quoth Asif Iqbal:
>(alias)@qmail:~$ rm -rf /maildisk/example.net/newtest
>(alias)@qmail:~$ ezmlm-make -gsrl -5 owner@example.net /maildisk/
>example.net/newtest ~/.qmail-newtest2 newtest example.net
>(alias)@qmail:~$ ls -al .qmail-newtest2*
>lrwxrwxrwx   1 alias    qmail         36 Jun 18 20:23 .qmail-newtest2 ->
>/maildisk/example.net/newtest/editor
>lrwxrwxrwx   1 alias    qmail         37 Jun 18 20:23
>.qmail-newtest2-default -> /maildisk/example.net/newtest/manager
>lrwxrwxrwx   1 alias    qmail         35 Jun 18 20:23 .qmail-newtest2-owner
>-> /maildisk/example.net/newtest/owner
>lrwxrwxrwx   1 alias    qmail         37 Jun 18 20:23
>.qmail-newtest2-return-default -> /maildisk/example.net/newtest/bouncer
>
>So now I have to rename them to .qmail-newtest-*

Sounds like a good plan.

>(alias)@qmail:~$ mv .qmail-newtest2-default .qmail-newtest-default
>(alias)@qmail:~$ mv .qmail-newtest2-owner .qmail-newtest-owner
>(alias)@qmail:~$ mv .qmail-newtest2-return-default
>.qmail-newtest-return-default
>(alias)@qmail:~$ rm .qmail-newtest2

Why'd you delete that last one? I think the right thing to do is:

     $ mv .qmail-newtest2 .qmail-newtest

(which IS atomic)

>I am guessing the last step is not atomic. Is it? Also is this how 
>you were referring to do as the second option?

Yes, the rename process isn't atomic, but consider what you're doing: 
you're converting a multiple-redirect file into a mailing list. Who 
cares whether the surrounding email addresses (e.g. newtest-owner) are  
established atomically? All that really matters is that if any message 
is sent to newtest@yourserver, it goes either to the old list of 
addresses or to the new mailing list and that there's no chance of 
qmail getting confused and perhaps sending it to only a few of the old 
addresses.

Of course, another way to do it would be to use the qmail-users 
mechanism. Thus, you could create your ezmlm list elsewhere, put the 
.qmail files just about anywhere, and then use a qmail-users alias to 
specify where the list's .qmail files are (i.e. NOT in the ~alias 
folder), and update the qmail-users database atomically (with 
`qmail-newu`).

~Kyle
- -- 
Power always thinks it has a great soul and vast views beyond the 
comprehension of the weak; and that it is doing God's service when it 
is violating all his laws.
                                                          -- John Adams
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