avoid running out of space on Pi Zero

scripts/install_birdnet.sh

@@ -25,6 +25,11 @@ sudo -E HOME=$HOME USER=$USER ./install_services.sh || exit 1
 source /etc/birdnet/birdnet.conf
 
 install_birdnet() {
+  TMP_SIZE=$(df --output=avail /tmp | tail -n 1)
+  if [[ $TMP_SIZE -lt 300000 ]]; then
+    mkdir -p $HOME/bird_tmp
+    export TMPDIR=$HOME/bird_tmp
+  fi
   cd ~/BirdNET-Pi || exit 1
   echo "Establishing a python virtual environment"
   python3 -m venv birdnet
@@ -39,6 +44,7 @@ install_birdnet() {
     [ $LOOP_COUNT == 0 ] && exit 1
     sleep 5
   done
+  [ -d $HOME/bird_tmp ] && rm -rf $HOME/bird_tmp
 }
 
 [ -d ${RECS_DIR} ] || mkdir -p ${RECS_DIR} &> /dev/null