preinst is in qmail-run 2.0.2.
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 | #!/bin/sh
set -e
errcho () {
echo "$*" >&2
}
if test "$1" = upgrade && dpkg --compare-versions "$2" lt 2.0.0; then
errcho "Upgrading qmail-run from version $2 is not yet supported."
errcho
exit 1
fi
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