postinst is in dovecot-imapd 1:2.0.19-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
CONFFILES="conf.d/20-imap.conf"
for conffile in $CONFFILES ; do
# Tell ucf that the file in /usr/share/dovecot is the latest
# maintainer version, and let it handle how to manage the real
# configuration file in /etc/dovecot.
ucf --three-way /usr/share/dovecot/$conffile /etc/dovecot/$conffile
ucfr dovecot-imapd /etc/dovecot/$conffile
done
echo 'protocols = $protocols imap' > /usr/share/dovecot/protocols.d/imapd.protocol
fi
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