prerm is in mail-stack-delivery 1:2.2.22-1ubuntu2.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | #! /bin/sh
set -e
# conffile renamed in 1:1.2.9-1ubuntu8
if dpkg --compare-versions "$2" lt-nl "1:1.2.9-1ubuntu8"; then
# "$1" is equal to "upgrade" (which means downgrading in this case) or "abort-upgrade"
# downgrading to <1:1.2.9-1ubuntu8 -- restore old conffile name
if [ -f "/etc/dovecot/conf.d/01-mail-stack-delivery.conf" ]; then
mv -f "/etc/dovecot/conf.d/01-mail-stack-delivery.conf" "/etc/dovecot/conf.d/01-dovecot-postfix.conf"
fi
if [ -f "/etc/dovecot/conf.d/01-mail-stack-delivery.auth" ]; then
mv -f "/etc/dovecot/conf.d/01-mail-stack-delivery.auth" "/etc/dovecot/conf.d/01-dovecot-postfix.auth"
fi
if [ -f "/usr/share/dovecot/mail-stack-delivery.conf" ]; then
mv -f "/usr/share/dovecot/mail-stack-delivery.conf" "/usr/share/dovecot/dovecot-postfix.conf"
fi
if [ -f "/etc/dovecot/mail-stack-delivery.conf" ]; then
mv -f "/etc/dovecot/mail-stack-delivery.conf" "/etc/dovecot/dovecot-postfix.conf"
fi
if [ -e "/var/backups/mail-stack-delivery/main.cf-backup" ]; then
if [ -n "//var/backups/dovecot-postfix/" ]; then
mkdir "/var/backups/dovecot-postfix/"
fi
mv -f "/var/backups/mail-stack-delivery/main.cf-backup" "/var/backups/dovecot-postfix/main.cf-backup"
test -d /var/backups/mail-stack-delivery/ && rmdir /var/backups/mail-stack-delivery/
fi
fi
exit 0
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