preinst is in dnscache-run 1:1.05-8ubuntu1.
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
test "$1" = 'install' || exit 0
test -z "$2" || exit 0
# not upgrading
for i in Gdnscache Gdnslog Gtinydns Gaxfrdns; do
getent passwd $i >/dev/null ||
adduser --quiet --system --force-badname --shell /bin/false --group \
--home /nonexistent --no-create-home $i || exit 1;
done
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