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Re: [DEBIAN] Why does sendmail depend on procmail?

>>"Scott" == Scott Ellis <storm@gate.net> writes:

Scott> On Tue, 7 Oct 1997, Michael Meskes wrote:
>> How about creating a virtual package mda that's provided by
>> both. Also both should use update-alternatives to create a binary
>> (link) that's called mda (or so). This binary may then be called by
>> sendmail via sendmail.cf.

Scott> Before this, sendmail depended on deliver or procmail.  This
Scott> however created a situation where procmail could be replaced by
Scott> deliver (or the other way around) without the sendmail config
Scott> changing.  This would break mail setups rather silently.

	Unless both procmail and deliver delivered a wrapper
 /usr/bin/mda using update alternatives. The wrapper shall have a
 common interface.

Scott> The problem with making an "mda" link is that procmail and
Scott> deliver don't support the same option set.  They are not really
Scott> alternative interfaces (like mawk and gawk for instance), but
Scott> two different programs that accomplish the same thing.
Scott> Sendmail needs to know which one it is using.

	This is handled by the wrapper solution above. So technically,
 it *is* possible to have any number of packages delivering the
 virtual package mds, and still have sendmail not break or have
 different sendmail.cf files.

 Conceptual integrity in turn dictates that the design must proceed
 from one mind, or from a very small number of agreeing resonant
 minds. Frederick Brooks Jr., "The Mythical Man Month"
Manoj Srivastava               <url:mailto:srivasta@acm.org>
Mobile, Alabama USA            <url:http://www.datasync.com/%7Esrivasta/>

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