#!/bin/sh
# Save this script at a suitable path, for example 
# /usr/local/sbin/suspend.sh
# then edit /etc/rc.suspend to include the path. 

# Allow detachment of a USB device that is used for a ZFS pool named 
# Transcend.
# 
while mount | grep Transcend 2>&1; do
   zpool export Transcend
   sleep 5
done

# Since <https://bugs.freebsd.org/253553> is fixed, I wonder whether combined 
# use of sysutils/lsof lsof(8) and devel/libnotify notify-send(1) can notify 
# the user of the path to an open file, if one is open within the pool.
# <https://www.freebsd.org/cgi/man.cgi?query=lsof&sektion=8&manpath=freebsd-ports>
# <https://www.freebsd.org/cgi/man.cgi?query=notify-send&sektion=1&manpath=freebsd-ports>

# Allow detachment of USB devices that are used for OpenZFS L2ARC for 
# the boot pool on internal storage.
# 
zpool offline august gpt/cache-august
zpool offline august gpt/cache2-august
zpool offline august gpt/cache3-august

sync

killall pulseaudio

# Credit to David Schlachter for 'USB audio devices on FreeBSD'
# <https://www.davidschlachter.com/misc/freebsd-usb-audio>
# 
# Attempt to kill all dsp- and mixer-related processes.
# 
while fstat | grep -e dsp -e mixer 2>&1; do
   fstat | grep -e dsp -e mixer | cut -w -f 3 | while read pid;
      do kill -15 "$pid"
   done
done

# Make <IDT 92HD81B1X (Analog 2.0+HP/2.0)> (play/rec) the default
# on an HP EliteBook 8570p.
# 
sysctl hw.snd.default_unit=1

# Retrospective
# =============
#  
# I found it impossible to kill PulseAudio. Instead, it was set to no longer 
# automatically spawn: <https://forums.FreeBSD.org/posts/519408>.
# 
# Killing of KMix by the script required a manual run of
# /usr/local/bin/kded5 &
# as grahamperrin after each wake of the computer.
# 
# For a while, I forced deletion of KMix – 
# <https://forums.FreeBSD.org/posts/524012> – and used a fake manifest to 
# prevent automated reinstallation: <https://forums.FreeBSD.org/posts/528187>.
# 
# Eventually, the issue involving KMix was resolved: 
# <https://github.com/freebsd/freebsd-ports/commit/7dc8045a63930a3a520e17723139003867b58c39>