we should edit init file. We dont actually want to hard code the template

debian/config-template

@@ -1,16 +1,19 @@
+## TEMPLATE FILE - This is used to create /etc/default/dump1090-mutability ##
+## The first three lines will be discarded                                 ##
+
 # dump1090-mutability configuration file
 # This is a POSIX shell fragment.
 # You can edit this file directly, or use
 # "dpkg-reconfigure dump1090-mutability"
 
 # Set to "yes" to start dump1090 on boot.
-START_DUMP1090="yes"
+START_DUMP1090=
 
 # User to run dump1090 as.
-DUMP1090_USER="dump1090"
+DUMP1090_USER=
 
 # Logfile to log to
-LOGFILE="/var/log/dump1090-mutability.log"
+LOGFILE=
 
 #
 # Receiver options
@@ -18,47 +21,41 @@ LOGFILE="/var/log/dump1090-mutability.log"
 
 # RTLSDR device index or serial number to use
 # If set to "none", dump1090 will be started in --net-only mode
-DEVICE=""
+DEVICE=
 
 # RTLSDR gain in dB.
 # If set to "max" (the default) the maximum supported gain is used.
 # If set to "agc", the tuner AGC is used to set the gain.
-GAIN="max"
+GAIN=
 
 # RTLSDR frequency correction in PPM
-PPM="0"
+PPM=
 
 # If yes, enable sampling at 2.4MHz. Otherwise, 2.0MHz is used.
-OVERSAMPLE="yes"
+OVERSAMPLE=
 
 # If yes, enables phase-enhancement of messages
-PHASE_ENHANCE="yes"
+PHASE_ENHANCE=
 
 #
 # Decoding options
 #
 
 # If yes, fixes messages with correctable CRC errors.
-FIX_CRC="yes"
+FIX_CRC=
 
 # If yes, enables aggressive fixes to damaged messages.
 # Use with caution - it can increase the rate of undetected errors.
-AGGRESSIVE="no"
+AGGRESSIVE=
 
 # If set, supplies a reference location for local position decoding.
-LATLONFILE=/var/lib/dump1090/latlon
-if [ -e $LATLONFILE ]; then
-	LAT=$(sed -n '1p' < $LATLONFILE)
-	LON=$(sed -n '2p' < $LATLONFILE)
-else 
-	LAT=""
-	LON=""
-fi
+LAT=
+LON=
 
 # If set, provides the absolute maximum receiver range used to
 # filter bad position reports, and to determine when local position
 # decoding is safe to use. Specify this in nautical miles (NM).
-MAX_RANGE="300"
+MAX_RANGE=
 
 #
 # Networking options
@@ -70,62 +67,62 @@ MAX_RANGE="300"
 # /usr/share/dump1090-mutability and JSON_DIR (below) using a proper
 # webserver. See /etc/lighttpd/conf-available/90-dump1090.conf
 # for an example configuration ("sudo lighty-enable-mod dump1090" to enable)
-HTTP_PORT="0"
+HTTP_PORT=
 
 # Port to listen on for raw (AVR-format) input connections. 0 disables.
-RAW_INPUT_PORT="30001"
+RAW_INPUT_PORT=
 
 # Port to listen on for raw (AVR-format) output connections. 0 disables.
-RAW_OUTPUT_PORT="30002"
+RAW_OUTPUT_PORT=
 
 # Port to listen on for SBS-format output connections. 0 disables.
-SBS_OUTPUT_PORT="30003"
+SBS_OUTPUT_PORT=
 
 # Port to listen on for Beast-format input connections. 0 disables.
-BEAST_INPUT_PORT="30004"
+BEAST_INPUT_PORT=
 
 # Port to listen on for Beast-format output connections. 0 disables.
-BEAST_OUTPUT_PORT="30005"
+BEAST_OUTPUT_PORT=
 
 # Port to listen on for FATSV-format output connections. 0 disables.
-FATSV_OUTPUT_PORT="10001"
+FATSV_OUTPUT_PORT=
 
 # TCP heartbeat interval in seconds. 0 disables.
-NET_HEARTBEAT="60"
+NET_HEARTBEAT=
 
 # Minimum output buffer size per write, in bytes.
-NET_OUTPUT_SIZE="500"
+NET_OUTPUT_SIZE=
 
 # Maximum buffering time before writing, in seconds.
-NET_OUTPUT_INTERVAL="1"
+NET_OUTPUT_INTERVAL=
 
 # TCP buffer size, in bytes
-NET_BUFFER="262144"
+NET_BUFFER=
 
 # Bind ports on a particular address. If unset, binds to all interfaces.
 # This defaults to binding to localhost. If you need to allow remote
 # connections, change this.
-NET_BIND_ADDRESS="127.0.0.1"
+NET_BIND_ADDRESS=
 
 #
 # Misc options
 #
 
 # Interval (in seconds) between logging stats to the logfile. 0 disables.
-STATS_INTERVAL="3600"
+STATS_INTERVAL=
 
 # Path to write json state to (for use with an external webserver). Blank disables.
-JSON_DIR="/run/dump1090-mutability"
+JSON_DIR=
 
 # Interval between writing json state (in seconds). 0 disables.
-JSON_INTERVAL="1"
+JSON_INTERVAL=
 
 # Accuracy of receiver location to write to json state, one of "exact" / "approximate" / "none"
-JSON_LOCATION_ACCURACY="approximate"
+JSON_LOCATION_ACCURACY=
 
 # Set to yes to log all decoded messages
 # This can get large fast!
-LOG_DECODED_MESSAGES="no"
+LOG_DECODED_MESSAGES=
 
 # Additional options that are passed to the Daemon.
-EXTRA_ARGS=""
+EXTRA_ARGS=

debian/dump1090-mutability.init

@@ -63,8 +63,13 @@ if [ "x$OVERSAMPLE" = "xyes" ]; then ARGS="$ARGS --oversample"; fi
 if [ "x$FIX_CRC" = "xyes" ]; then ARGS="$ARGS --fix"; fi
 if [ "x$PHASE_ENHANCE" = "xyes" ]; then ARGS="$ARGS --phase-enhance"; fi
 if [ "x$AGGRESSIVE" = "xyes" ]; then ARGS="$ARGS --aggressive"; fi
-if [ -n "$LAT" ]; then ARGS="$ARGS --lat $LAT"; fi
-if [ -n "$LON" ]; then ARGS="$ARGS --lon $LON"; fi
+LATLONFILE=/var/lib/dump1090/latlon
+if [ -e $LATLONFILE ]; them
+	LATVAL=$(sed -n '1p' < $LATLONFILE)
+	LONVAL=$(sed -n '2p' < $LATLONFILE)
+fi
+if [ -n "$LAT" ]; then ARGS="$ARGS --lat $LAT"; else if [ -n $LATVAL ]; then ARGS="$ARGS --lat $LATVAL"; fi
+if [ -n "$LON" ]; then ARGS="$ARGS --lon $LON"; else if [ -n $LONVAL ]; then ARGS="$ARGS --lon $LONVAL"; fi
 ARGS="$ARGS --max-range $MAX_RANGE"; fi
 
 # net: