Change log truncation

Instead of truncating the log only after archiving, truncate it whenever
it gets above 1M bytes. This prevents the log from growing out of control
if TeslaUSB is configured to not do any archiving, or if archiving never
completes for some reason.

run/archiveloop

@@ -12,8 +12,14 @@ modprobe -r g_ether
 export LOG_FILE=/mutable/archiveloop.log
 
 function log () {
-  echo -n "$( date ): " >> "$LOG_FILE"
-  echo "$@" >> "$LOG_FILE"
+  echo "$( date ):" "$@" >> "$LOG_FILE"
+  if [[ "$(stat --format="%s" "$LOG_FILE")" -gt 1000000 ]]
+  then
+    local log_file2="${LOG_FILE}.2"
+    tail -n 5000 "$LOG_FILE" > "${log_file2}"
+    mv "$log_file2" "$LOG_FILE"
+    log "(log truncated)"
+  fi
 }
 
 function log_errors_on_exit {
@@ -664,18 +670,6 @@ function archive_clips () {
   /root/bin/disconnect-archive.sh
 }
 
-function truncate_log () {
-  local log_length
-  log_length=$( wc -l "$LOG_FILE" | cut -d' ' -f 1 )
-  if [ "$log_length" -gt 10000 ]
-  then
-    log "Truncating log..."
-    local log_file2="${LOG_FILE}.2"
-    tail -n 10000 "$LOG_FILE" > "${LOG_FILE}.2"
-    mv "$log_file2" "$LOG_FILE"
-  fi
-}
-
 function slowblink () {
   echo timer > "$STATUSLED/trigger" || return 0
   echo 900 > "$STATUSLED/delay_off"
@@ -886,8 +880,6 @@ do
 
   archive_clips
 
-  truncate_log
-
   /root/bin/awake_stop || true
 
   doubleblink