Installer for script & cron job that automatically deletes older drives when free space goes under 10GB.

install_deletion_job.sh

#!/bin/sh

# Create deletion script
if [ ! -d /data/cleardata ]
then
echo "Creating /data/cleardata folder"
mkdir /data/cleardata
else
echo "/data/cleardata folder already exists..."
fi

if [ ! -f /data/cleardata/cleardata.sh ]
then
echo "Creating /data/cleardata/cleardata.sh script"
else
echo "Updating /data/cleardata/cleardata.sh script"
fi

echo "#!/bin/sh

# get the available space left on the device
size=\$(df -k /storage/emulated/0/Android/data | tail -1 | awk '{print \$4}')

# check if the available space is smaller than 5GB (5000000kB)
if ((\$size<5000000)); then
  # find all files currently saved by openpilot in the past 7 hours and delete them.
  find /data/media/0/realdata/* -mmin +240 -exec rm -rf {} \;

fi" > /data/cleardata/cleardata.sh

chmod +x /data/cleardata/cleardata.sh

# Create job file to run every 10 minutes.
if [ ! -d /data/crontab ]
then
echo "Creating /data/crontab"
mkdir /data/crontab
else
echo "/data/crontab folder already exists..."
fi

if [ ! -f /data/crontab/root ]
then
echo "Creating /data/crontab/root cron job"
else
echo "Updating existing /data/crontab/root cron job"
fi

echo "
*/10 * * * * /data/cleardata/cleardata.sh" > /data/crontab/root

#start job

cron_args="crond -b -c /data/crontab"

if [ `ps -o args | grep "crond -b -c /data/crontab" | head -1` == "crond -b -c /data/crontab" ]
then
echo "cronjob already running"
else
echo "Starting cron job"
crond -b -c /data/crontab
fi

if [ ! -f /system/etc/init.d/crond ]
then
echo "Persisting cron job after reboot"
# Remount /system to be read/write
mount -o rw,remount /dev/block/bootdevice/by-name/system /system

# Use Busybox crond
echo "
crond -b -c /data/crontab" >> /system/etc/init.d/crond
chmod +x /system/etc/init.d/crond

# Remount /system to be read only
mount -o ro,remount /dev/block/bootdevice/by-name/system /system

elif [ `grep -r "crond -b -c /data/crontab" /system/etc/init.d/crond` == "crond -b -c /data/crontab" ]
then
echo "Busybox crond already configured"
else
### For persistance after reboot
echo "Persisting cron job after reboot"
# Remount /system to be read/write
mount -o rw,remount /dev/block/bootdevice/by-name/system /system

# Use Busybox crond
echo "
crond -b -c /data/crontab" >> /system/etc/init.d/crond
chmod +x /system/etc/init.d/crond

# Remount /system to be read only
mount -o ro,remount /dev/block/bootdevice/by-name/system /system
fi

echo "Done!"

Updated for better file handling from @tentious

Thanks!

note that the comment and code don't agree here

  # find all files currently saved by openpilot in the past 7 hours and delete them.
  find /data/media/0/realdata/* -mmin +240 -exec rm -rf {} \;

the find command actually lists all files older than 240 minutes, or 4 hours
so it's actually deleting files older than 4 hours, not files newer than 7 hours