Use debconf instead of mail to inform user in postinst

[Daniel Richard G.]

[Mirror of Debian bug report]

When I install chrony (1.24 in Oneiric), I get the following message in my inbox:

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The password for chronyc is in /etc/chrony/chrony.keys.

Chrony has been configured to assume that your real-time clock is on UTC
time. If this is not correct edit /etc/chrony/chrony.conf. The comments
explain what to do.

In the chrony.conf included in this package:

Chrony has been configured on the assumption that you are using either a
dialup connection or a PPPoE DSL connection. It will be brought online
when PPP comes up and offline when it goes down. Code in
/etc/init.d/chrony attempts to determine whether the network is up or
down at boot time and sets chronyd on or off line accordingly. If this
is not correct you should edit /etc/chrony/chrony.conf. The comments
explain what to do. For more information on configuring Chrony use the
command 'info chrony'.

You can also change the default time servers in
/etc/chrony/chrony.conf.

Updating of the real-time clock has been disabled because some systems
that use either the genrtc driver or have HPET hardware clocks have
problems. To enable real-time clock updating edit
/etc/chrony/chrony.conf. The comments explain what to do.
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Please use debconf to get this message to the user, not mail(1). A mail
message is not appropriate for something as rote as a package
installation, debconf is already the de facto approach to relaying
messages like this, and the current approach does nothing if an MTA
isn't installed.