nodewatcher: Output to stderr instead of log file

Maintaining a logfile manually is complicated and
has no major improvements over just logging to stderr,
because nodewatcher is no deamon and can be run manually
for debugging purposes.

Also, the debug output from subscripts currently is not
written to the log file anyway and the debug level is not
used eiher.

Therefore, the file logging and debug level is removed
from nodewatcher, which simplifies the code a bit.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

src/packages/fff/fff-nodewatcher/files/etc/uci-defaults/93-fff-nodewatcher

@@ -2,8 +2,6 @@ touch /etc/config/nodewatcher
 
 uci batch <<EOF
   add nodewatcher script
-  set nodewatcher.@script[-1].error_level='0'
-  set nodewatcher.@script[-1].logfile='/var/log/nodewatcher.log'
   set nodewatcher.@script[-1].data_file='/tmp/crawldata/node.data'
   set nodewatcher.@script[-1].status_text_file='/tmp/status.txt'
 EOF

src/packages/fff/fff-nodewatcher/files/usr/sbin/nodewatcher

@@ -14,28 +14,10 @@ trap "lock -u \"$lockfile\"" INT TERM EXIT
 
 [ -s /etc/config/nodewatcher ] || exit 1
 
-SCRIPT_ERROR_LEVEL=$(uci get nodewatcher.@script[0].error_level)
-SCRIPT_LOGFILE=$(uci get nodewatcher.@script[0].logfile)
 SCRIPT_DATA_FILE=$(uci get nodewatcher.@script[0].data_file)
 
-if [ "$SCRIPT_ERROR_LEVEL" -gt "1" ]; then
-	debug() {
-		echo "$1" >> "$SCRIPT_LOGFILE"
-	}
-else
-	debug() {
-		:
-	}
-fi
-
-#This method checks if the log file has become too big and deletes the first X lines
-delete_log() {
-	if [ -f "$SCRIPT_LOGFILE" ]; then
-		if [ "$(find "$SCRIPT_LOGFILE" -printf "%s")" -gt "6000" ]; then
-			sed -i '1,60d' "$SCRIPT_LOGFILE"
-			debug "$(date): Logfile has been made smaller"
-		fi
-	fi
+debug() {
+	(>&2 echo "$1")
 }
 
 #This method generates the crawl data XML file that is being fetched by netmon
@@ -60,10 +42,6 @@ crawl() {
 
 LANG=C
 
-#Prüft ob das logfile zu groß geworden ist
-debug "$(date): Check logfile"
-delete_log
-
 #Erzeugt die statusdaten
 debug "$(date): Generate actual status data"
 crawl