Re: MTA packaging (exim, postfix, sendmail, ssmtp)

[Christian Franke]

Christian Franke wrote:
Yaakov Selkowitz wrote:
Corinna, Christian, Daniel, Pierre,
Because MTAs must be user-configured, and we certainly don't want to 
lose the selection during package upgrades, the alternatives cannot 
be handled in package postinst/prerm.  I think the only way to make 
this work is for each MTA config script to handle these instead by 
including the following snippets in the respective MTA config scripts.

Please review this carefully in case I missed anything.

...

postfix:
========

/usr/sbin/alternatives --install /usr/sbin/sendmail mta 
/usr/sbin/postfix.exe 0 \
    --slave /usr/lib/sendmail mta-sendmail /usr/sbin/postfix.exe \
    --slave /usr/bin/mailq mta-mailq /usr/sbin/postfix.exe \
    --slave /usr/bin/newaliases mta-newaliases /usr/sbin/postfix.exe

/usr/sbin/alternatives --set mta /usr/sbin/postfix.exe


"postfix" is the control program, there is a separate "sendmail" 
command for sendmail emulation. Attached is the alternatives part of 
the /etc/postinstall/postfix.sh from the current draft postfix 
package. It also provides links for the related man pages.

Forgot to mention: This will be moved from postinstall to the configure 
script as requested.