postinst is in udisks2 2.1.7-1ubuntu1.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37  | #!/bin/sh
set -e
get_pid() {
    [ -n "$1" ] || return 0
    [ -S /var/run/dbus/system_bus_socket ] || return 0
    dbus-send --system --dest=org.freedesktop.DBus --print-reply \
              /org/freedesktop/DBus org.freedesktop.DBus.GetConnectionUnixProcessID \
              string:$1 2>/dev/null | awk '/uint32/ {print $2}'
}
if [ "$1" = "configure" ]; then
    # stop udisksd
    pid=$(get_pid org.freedesktop.UDisks2)
    kill $pid 2>/dev/null || true
    # in that version, the mounted-fs file moved
    if dpkg --compare-versions "$2" lt-nl "1.99.0-4" &&
        [ -e /run/udisks2/mounted-fs ] &&
        [ -d /var/lib/udisks2 ] &&
        [ ! -e /var/lib/udisks2/mounted-fs ]; then
        mv /run/udisks2/mounted-fs /var/lib/udisks2/
    fi
    # restart daemon if it was running before
    [ -z "$pid" ] || udisksctl status >/dev/null || true # will trigger through D-Bus activation
    # we ship udev rules, so trigger an update
    udevadm trigger --subsystem-match=block --action=change
fi
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/bash_completion.d/udisksctl-bash-completion.sh 2.0.0-1~ -- "$@"
# End automatically added section
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