preinst is in dovecot-core 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 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt "1:2.2.21-1~"; then
# Some versions prior to 1:2.2.21-1 did ship and activate dovecot.socket by
# default. This default was changed in 1:2.2.21-1 by disabling
# dovecot.socket on installation and also explicitly stopping
# dovecot.socket during prerm. However, if we are upgrading from older
# versions, an incoming IMAP connection between old prerm and upgrade end
# might re-activate dovecot.service with an inconsistent on-disk layout. We
# do a best-effort attempt to avoid this by stopping dovecot.socket and
# dovecot.service here. See #814999 for more details.
if [ -d /run/systemd/system ]; then
deb-systemd-invoke stop dovecot.socket dovecot.service || true
fi
fi
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