'4 wrote:
> 4;1008830']Retrieving the PID is obviously not going to work, because
> the status message doesn't contain the PID. So I changed it into this:
> >
Code:
--------------------
> > # determine cardname from squeezelite process id
> local PID=$(ps ax | pgrep squeezelite)
> local cardname=$(ps | grep $PID | awk -F CARD= {'print $2'} | awk -F ,
{'print $1'})
--------------------
> >
>
> I might also need to change the command to get the card name, but I
> don't have time right now to test it
It didn't work so had tp change it to:
Code:
--------------------
# determine card name from squeezelite process
local cardname=$(ps ax | grep squeezelite | awk -F CARD= {'print $2'} | awk
-F , {'print $1'})
--------------------
In order to extract the card name from the squeezite process I also
needed to start sqeezelite with custum parameters by editting
'/etc/systemd/system/squeezelite.service.d/dietpi-services_edit.conf'.
Otherwise it would start it without the -o option.
Code:
--------------------
[Unit]
#Description=SqueezeLite (DietPi)
[Service]
#User=squeezelite
ExecStart=
ExecStart=/usr/bin/squeezelite -o hw:CARD=C20,DEV=0 -a 4096:8096:32:0 -C 5 -n
"DietPi-Squeezelite" -f /var/log/squeezelite.log -D dop
[Install]
#WantedBy=multi-user.target
--------------------
This is the modified script for DietPi (dislaimer: not fully tested
yet)
Code:
--------------------
#!/bin/sh
# Script to be used by udev rules that detect when a USB DAC is connected or
disconnected,
# in order to start or stop Squeezelite
# $1 : is the script option: 'restart', 'stop', 'find' or 'make'
# $2 : For 'restart' and 'stop', $2 is the kernel name ($kernel) that is
generated by the udev event
# It is used to match a 'removed' USB device against the device assigned
when the DAC was inserted
# For 'find' and 'make', $2 is the (CARD)name of the DAC, as used in the
squeezelite command string.
# The 'find' option is used at boot to detect which device the DAC is
connected to,
# in the case that the DAC is up before squeezelite attempts to start.
# The 'make' option creates the udev rules file
# Examples:
# sqlite_control make DAC
# This will create a rules file in /etc/udev/rules.d.
# The rule number is curently fixed at 10, and the rule name will equal the
card name; in this case 'DAC'
# Run this once, manually from the command line.
# sqlite_control find DAC
# This will check whether the DAC is connected, and write its kernel id to
/tmp/DAC_kername.txt
# This is intended to be used as a User Command, run at boot, so that the
'stop' option knows which kernel id to look for.
# sqlite_control restart $kernel and sqlite_control stop $kernel
# (Re)start and stop squeezelite, respectively.
# These two options are called by the udev rules in response to 'add' and
'remove' events
# They take the $kernel argument that is available when the udev rule is
triggered.
# The associated udev rules are of the form:
# SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor}=="xxxx",
ATTR{idProduct}=="xxxx", RUN+="/home/sqlite/sqlite_control.sh restart $kernel"
# SUBSYSTEM=="usb", ACTION=="remove", RUN+="/home/sqlite/sqlite_control.sh
stop $kernel"
SQLITErestart() {
local logfile=$1
local attempts=5 # number of tries
local interval=1 # interval between tries (seconds)
local uptime
local count=$attempts
while [ "$(dietpi-services status squeezelite)" == *"inactive (dead)"* ]; do
if [ $((count--)) -le 0 ]; then
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
echo "$uptime Squeezelite failed to initialize within $attempts attempts."
>> $logfile
exit 1
fi
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
echo "$uptime Attempting to start squeezelite" >> $logfile
dietpi-services restart squeezelite >> $logfile
sleep $interval
done
# determine cardname from squeezelite process
local cardname=$(ps ax | grep squeezelite | awk -F CARD=
{'print $2'} | awk -F , {'print $1'})
sudo /usr/sbin/alsactl restore $cardname
}
logfile=/var/log/dietpi_dac.log
case $1 in
restart ) # restart squeezelite when DAC is inserted/powered up
# output the device '$kernel' name to a text file, so that it can be used to
check against USB 'remove' events
kername=$2
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
if [ -z $kername ]; then
echo "$uptime DAC not detected" >> $logfile
else
echo "$uptime DAC detected on $kername" >> $logfile
echo $kername > /tmp/DAC_kername.txt
SQLITErestart $logfile &
fi
;;
stop ) # stop squeezelite when DAC is removed/powered down
# compare $kernel device name to the one created by this script when the DAC
was inserted/powered up
startname=$(cat /tmp/DAC_kername.txt)
stopname="$2"
if [ $stopname == $startname ]; then # stop squeezelite if names match
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
echo "$uptime DAC on $stopname removed" >> $logfile
dietpi-services stop squeezelite >> $logfile
fi
;;
find ) # create the file with the kernel name
# find Vendor and Product IDs for the DAC from the udev rules
cardname=$2
# name the rules file after the (CARD)name of the DAC
rulesfile=etc/udev/rules.d/10-$cardname.rules
idVendor=$(cat /$rulesfile | grep idVendor | awk -F idVendor {'print $2'} |
awk -F \" {'print $2'})
idProduct=$(cat /$rulesfile | grep idProduct | awk -F idProduct {'print $2'}
| awk -F \" {'print $2'})
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
echo "$uptime Searching for $cardname with idVendor=$idVendor and
idProduct=$idProduct in dmesg" >> $logfile
kername=$(dmesg | grep -m 1 "idVendor=$idVendor, idProduct=$idProduct" | awk
-F usb {'print $2'} | awk -F : {'print $1'})
# output the $kernel device name to a file for use when detecting 'removed'
USB devices
echo $kername > /tmp/DAC_kername.txt
uptime=$(printf [%12s $(cat /proc/uptime | awk {'print $1'})])
if [ -z $kername ]; then
echo "$uptime $cardname not detected" >> $logfile
else
echo "$uptime $cardname detected on $kername" >> $logfile
sudo /usr/sbin/alsactl restore
fi
;;
make ) # make the rules file
# one command line parameter: the name of the 'CARD', as used in the
squeezelite command line
scriptfile=$(realpath $0)
cardname=$2
# look for cardname in /proc/asound/cards to determine card number
cardno=$(cat /proc/asound/cards | grep -m 1 $cardname | awk {'print $1'})
# extract idVendor and idProduct from /proc/asound/card<n>/usbid
usbid=$(cat /proc/asound/card$cardno/usbid)
idVendor=$(echo $usbid | awk -F: {'print $1'})
idProduct=$(echo $usbid | awk -F: {'print $2'})
# create udev rules
rule_add='SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor}=="'$idVendor'",
ATTR{idProduct}=="'$idProduct'", RUN+="'$scriptfile'$
rule_remove='SUBSYSTEM=="usb", ACTION=="remove", RUN+="'$scriptfile' stop
$kernel"'
# create rules file
rulesfile=etc/udev/rules.d/10-$cardname.rules
echo $rule_add > /$rulesfile
echo $rule_remove >> /$rulesfile
;;
esac
--------------------
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