Fix shellcheck issues

Author: NicolasDorier

tools/docker-entrypoint.sh

@@ -4,12 +4,12 @@ cat <<-EOF > "$LIGHTNINGD_DATA/config"
 ${LIGHTNINGD_OPT}
 EOF
 
-: ${EXPOSE_TCP:=false}
+: "${EXPOSE_TCP:=false}"
 
-export NETWORK=`cat $LIGHTNINGD_DATA/config | sed -n 's/^network=\(.*\)$/\1/p'`
-export CHAIN=`cat $LIGHTNINGD_DATA/config | sed -n 's/^chain=\(.*\)$/\1/p'`
+export NETWORK=$(sed -n 's/^network=\(.*\)$/\1/p' < "$LIGHTNINGD_DATA/config")
+export CHAIN=$(sed -n 's/^chain=\(.*\)$/\1/p' < "$LIGHTNINGD_DATA/config")
 
-sed -i '/^chain=/d' $LIGHTNINGD_DATA/config
+sed -i '/^chain=/d' "$LIGHTNINGD_DATA/config"
 
 export REPLACEDNETWORK="";
 if [ "$CHAIN" == "btc" ]; then
@@ -32,8 +32,8 @@ if [ "$CHAIN" == "ltc" ]; then
 fi
 
 if [[ $REPLACEDNETWORK ]]; then
-    sed -i '/^network=/d' $LIGHTNINGD_DATA/config
-    echo "network=$REPLACEDNETWORK" >> $LIGHTNINGD_DATA/config
+    sed -i '/^network=/d' "$LIGHTNINGD_DATA/config"
+    echo "network=$REPLACEDNETWORK" >> "$LIGHTNINGD_DATA/config"
     echo "Replaced network $NETWORK by $REPLACEDNETWORK in $LIGHTNINGD_DATA/config"
 fi
 
@@ -43,11 +43,11 @@ if [ "$EXPOSE_TCP" == "true" ]; then
 
     echo "C-Lightning starting"
     while read i; do if [ "$i" = "lightning-rpc" ]; then break; fi; done \
-    < <(inotifywait  -e create,open --format '%f' --quiet $LIGHTNINGD_DATA --monitor)
+    < <(inotifywait  -e create,open --format '%f' --quiet "$LIGHTNINGD_DATA" --monitor)
     echo "C-Lightning started"
 
 
-    socat -d -d TCP4-listen:$LIGHTNINGD_PORT,fork,reuseaddr UNIX-CONNECT:$LIGHTNINGD_DATA/lightning-rpc
+    socat -d -d "TCP4-listen:$LIGHTNINGD_PORT,fork,reuseaddr" "UNIX-CONNECT:$LIGHTNINGD_DATA/lightning-rpc"
 else
     lightningd
 fi