postinst is in resolvconf-admin 0.3-1.
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 | #!/bin/sh
set -e
case "$1" in
configure)
if ! getent group resolvconf-admins >/dev/null; then
addgroup --quiet --system resolvconf-admins || true
fi
chown root:resolvconf-admins /usr/bin/resolvconf-admin
chmod 4754 /usr/bin/resolvconf-admin
;;
esac
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