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added support for multiple instances, tweaked screen execution #354

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added support for multiple instances, tweaked screen execution #354

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87 changes: 69 additions & 18 deletions scripts/dw-start.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,17 @@

# Versioning (this file, not direwolf version)
#-----------
# v1.4 - OK1BIL - added support for multiple instances, tweaked screen execution
# v1.3 - KI6ZHD - added variable support for direwolf binary location
# v1.2 - KI6ZHD - support different versions of VNC
# v1.1 - KI6ZHD - expanded version to support running on text-only displays with
# auto support; log placement change
# v1.0 - WB2OSZ - original version for Xwindow displays only


#-------------------------------------
# Configuration
#-------------------------------------

#How are you running Direwolf : within a GUI (Xwindows / VNC) or CLI mode
#
Expand All @@ -36,40 +40,77 @@
# CLI mode is suited for say a Raspberry Pi running the Jessie LITE version
# where it will run from the CLI w/o requiring Xwindows - uses screen

RUNMODE=AUTO
RUNMODE="AUTO"

# Location of the direwolf binary. Depends on $PATH as shown.
# change this if you want to use some other specific location.
# e.g. DIREWOLF="/usr/local/bin/direwolf"

DIREWOLF="direwolf"

# In case direwolf is run in CLI, it is running in a screen session in the background.
# Each screen session has a name. If you want to run multiple instances of direwolf
# in parallel (i.e. two SDRs over STDIN), you need to specify unique names for the sessions.
# Note: screen is a linux tool to run user-interactive software in background.


INSTANCE="direwolf"


# Parameters for the direwolf binary can be set here. This replaces the DWCMD variable.
# Uncomment onlye on of the variables.

#Direwolf start up command :: Uncomment only one of the examples.
#
# 1. For normal operation as TNC, digipeater, IGate, etc.
# Print audio statistics each 100 seconds for troubleshooting.
# Change this command to however you wish to start Direwolf

DWCMD="$DIREWOLF -a 100"
DWPARAMS="-a 100"

# 2. FX.25 Forward Error Correction (FEC) will allow your signal to
# go farther under poor radio conditions. Add "-X 1" to the command line.

#DWCMD="$DIREWOLF -a 100 -X 1"
#DWPARAMS="-a 100 -X 1"

#---------------------------------------------------------------
#
# 3. Alternative for running with SDR receiver.
# Piping one application into another makes it a little more complicated.
# We need to use bash for the | to be recognized.
# 3. Alternative for running with SDR receiver. In case of using this, please pay attention
# to variable DWSTDIN below.

#DWPARAMS="-c /etc/direwolf/ok1abc-sdr.conf -t 0 -r 24000 -D 1 -"

#DWCMD="bash -c 'rtl_fm -f 144.39M - | direwolf -c sdr.conf -r 24000 -D 1 -'"
# A command to be fed into the STDIN of the direwolf binary. Main use for this is to configure rtl-sdr input.
# Leave commented if using soundcard inputs. If using rtl-sdr, uncomment folllowing lines and set parameters as needed.

#QRG="144.8M"
#GAIN="43"
#PPM="1"
#DWSTDIN="rtl_fm -f $QRG -g $GAIN -p $PPM -"

#Where will logs go - needs to be writable by non-root users
LOGFILE=/var/tmp/dw-start.log

# Where will logs go - needs to be writable by non-root users
LOGFILE="/var/tmp/dw-start.log"

# Startup delay in seconds - how long should the script wait before executing (default 30)
STARTUP_DELAY=30

#-------------------------------------
# Internal use functions
#-------------------------------------

# This function is to be recursively called from outside of this script. Its purpose
# is to avoid passing commands to screen or bash as strings, which is tricky.

function RUN_CLI () {

PARAMS=$1
STDIN=$2

if [ -z "$2" ]; then
$DIREWOLF $PARAMS
else
$STDIN | $DIREWOLF $PARAMS
fi
exit 0

}

#-------------------------------------
# Main functions of the script
Expand All @@ -91,11 +132,15 @@ function CLI {
# Screen commands
# -d m :: starts the command in detached mode
# -S :: name the session
$SCREEN -d -m -S direwolf $DWCMD >> $LOGFILE
#
# Screen is instructed to run this script again with a parameter (to execute direwolf with
# necessary parameters). This way commands do not need to be passed as string. Additionally,
# this allows for some pre-flight checks withing the screen session, should they be needed.
$SCREEN -d -m -S $INSTANCE $0 -runcli >> $LOGFILE
SUCCESS=1

$SCREEN -list direwolf
$SCREEN -list direwolf >> $LOGFILE
$SCREEN -list $INSTANCE
$SCREEN -list $INSTANCE >> $LOGFILE

echo "-----------------------"
echo "-----------------------" >> $LOGFILE
Expand Down Expand Up @@ -165,21 +210,27 @@ date >> $LOGFILE
# First wait a little while in case we just rebooted
# and the desktop hasn't started up yet.
#
sleep 30
sleep $STARTUP_DELAY


#
# Nothing to do if Direwolf is already running.
#

a=`ps ax | grep direwolf | grep -vi -e bash -e screen -e grep | awk '{print $1}'`
a=`ps ax | grep $INSTANCE | grep -vi -e bash -e screen -e grep | awk '{print $1}'`
if [ -n "$a" ]
then
#date >> /tmp/dw-start.log
#echo "Direwolf already running." >> $LOGFILE
exit
fi

# Check for parameter to recursively run this script and execute direwolf in cli
if [ $# -eq 1 ] && [ $1 == "-runcli" ]; then
RUN_CLI "$DWPARAMS" "$DWSTDIN"
exit 0
fi

# Main execution of the script

if [ $RUNMODE == "AUTO" ];then
Expand Down