postinst is in transmission-daemon 2.84-3ubuntu3.
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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67  | #!/bin/sh
set -e
test $DEBIAN_SCRIPT_DEBUG && set -v -x
chperms() {
	# chperms <user> <group> <perms> <file>
	if ! OVERRIDE=`dpkg-statoverride --list $4 2>&1`; then
		if [ -e $4 ]; then
			chown $1:$2 $4
			chmod $3 $4
		fi
	fi
}
case "$1" in
  configure)
    if ! getent passwd debian-transmission > /dev/null; then
        adduser --quiet \
                --system \
                --group \
                --no-create-home \
                --disabled-password \
                --home /var/lib/transmission-daemon \
                debian-transmission
    fi
    chperms debian-transmission debian-transmission 4750 /var/lib/transmission-daemon/.config/transmission-daemon
    chperms debian-transmission debian-transmission 4775 /var/lib/transmission-daemon/downloads
    chperms debian-transmission debian-transmission 0660 /etc/transmission-daemon/settings.json
    chperms root debian-transmission 2775 /etc/transmission-daemon
  ;;
esac
# Automatically added by dh_systemd_enable
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask transmission-daemon.service >/dev/null || true
# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled transmission-daemon.service; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable transmission-daemon.service >/dev/null || true
else
	# Update the statefile to add new symlinks (if any), which need to be
	# cleaned up on purge. Also remove old symlinks.
	deb-systemd-helper update-state transmission-daemon.service >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/transmission-daemon" ]; then
		update-rc.d transmission-daemon defaults >/dev/null
	fi
	if [ -x "/etc/init.d/transmission-daemon" ] || [ -e "/etc/init/transmission-daemon.conf" ]; then
		invoke-rc.d transmission-daemon start || exit $?
	fi
fi
# End automatically added section
exit 0;
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