preinst is in postgresql-9.3 9.3.24-0ubuntu0.14.04.
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 | #!/bin/sh
set -e
# DB format changed between beta 1 and 2
if [ "$1" = "upgrade" ] || [ "$1" = "install" ] && \
dpkg --compare-versions "$2" lt-nl "9.3~beta2"; then
if pg_lsclusters -h | grep -q '^9.3'; then
echo "ERROR: The database format changed between beta 1 and 2. Please dump your 9.3 clusters first and remove them, before attempting to upgrade the package." >&2
exit 1
fi
fi
exit 0
|