installs EON cron job that automatically purges oldest video when used space is greater than the MAX_USED_PERCENT limit

install_eon_purge_data.sh

#!/bin/env bash
set -e

# install via curl
# curl -sL https://gist.github.com/chasebolt/fd5210b4c2a44a2b0db383162a66632c/raw/install_eon_purge_data.sh | bash

# create purge script
mkdir -p /data/local
cat <<'EOF' > /data/local/purge-data.sh
#!/bin/sh
set -e

# OP is disabled if free space is less than 15%
MAX_USED_PERCENT=80

# update $PATH to contain all the binaries we need access to when running from cron
PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:$PATH

echo -e "\t\tUsed\tMax"
# delete oldest entries until we are under the $MAX_USED_PERCENT limit
while true; do
  # get the used space on the device
  USED_PERCENT=$(df -h /data/media/0/realdata | tail -1 | awk '{print $5}' | sed 's/%$//')

  # check if the available space is lower than the max allowed
  if [[ USED_PERCENT -gt MAX_USED_PERCENT ]]; then
    echo -e "Deleting\t${USED_PERCENT}%\t${MAX_USED_PERCENT}%"
    # TODO: prioritize deleting driver monitoring videos first
    find /data/media/0/realdata/* -type f -not -name 'rlog.bz2' -print0 2>/dev/null | \
      xargs -r -0 ls -tr 2>/dev/null | \
      head -1 | \
      xargs rm -rf
  else
    echo -e "Complete\t${USED_PERCENT}%\t${MAX_USED_PERCENT}%"
    break
  fi
done

# delete empty directories
# find doesnt have -empty param so we have to use shell
find /data/media/0/realdata/* -type d -exec bash -c \
  'shopt -s nullglob; shopt -s dotglob; \
  a=("$1"/*); [[ ${a[@]} ]] || printf "%s\n" "$1"' sh {} \; 2>/dev/null | \
  xargs -r rmdir
EOF
chmod 0755 /data/local/purge-data.sh

# create cron job to run every 10 minutes.
mkdir -p /data/local/crontab
echo '*/10 * * * * /data/local/purge-data.sh' > /data/local/crontab/root

# install crond into userinit
cat <<EOF > /data/local/userinit.sh
#!/bin/env sh

/data/data/com.termux/files/usr/bin/applets/crond -c /data/local/crontab
EOF
chmod 0755 /data/local/userinit.sh

# cleanup previous versions
if [[ -f /system/etc/init.d/crond ]]; then
  mount -o rw,remount /dev/block/bootdevice/by-name/system /system
fi

rm -rf \
  /data/cleardata \
  /data/crontab \
  /system/etc/init.d/crond

if grep '\srw[\s,]' /proc/mounts | grep -q '\s/system\s'; then
  mount -o ro,remount /dev/block/bootdevice/by-name/system /system
fi

echo 'Install complete! Please reboot to start crond.'

I wrote my own script (worked) and then tried set it up to run regularly via cron (didn't work.. filesystems are all readonly)

I found https://gist.github.com/SippieCup/b5a4d8f7b11f6d2af93a9ddfcaebbf6e which is a different approach (instead of a while loop, it just deletes all files older than 4 hours) but adds flipping the filesystem to read/write to make the cron entries, then flips back to readonly

I see, so if I Install this link https://gist.github.com/SippieCup/b5a4d8f7b11f6d2af93a9ddfcaebbf6e, will it work?
Like did you try it and did it work?

This will install but never run as is...seems like bash is not the default shell when the job is kicked off by cron. Changing the shebang line in the purge script on line 10 from #!/bin/bash to #!/bin/sh will make this work correctly....

This will install but never run as is...seems like bash is not the default shell when the job is kicked off by cron. Changing the shebang line in the purge script on line 10 from #!/bin/bash to #!/bin/sh will make this work correctly....

Hi Castillo-luis

Thank you for the reply

But, if we are to change /bash to /sh in line 10, should we also change /bash to /sh in line 1, 5, 41 and also when executing the curl command once ssh'ed into EON?
In other words, should this like be changed from
curl -sL https://gist.github.com/chasebolt/fd5210b4c2a44a2b0db383162a66632c/raw/install_eon_purge_data.sh | bash
to
curl -sL https://gist.github.com/chasebolt/fd5210b4c2a44a2b0db383162a66632c/raw/install_eon_purge_data.sh | sh
?

Thank you!
Krishna.

Just changing that one line (line 10) made it work for me....

Just run the curl command then go to the directory where it made the script and change it. Or clone this script to your own repo change line 10 and issue the curl command against your own repo..

I modified this script and added code to auto shutdown eon when done uploading files and not charging....great for Bosch which does not have constant power

https://gist.github.com/castillo-luis/adf461e15e00f2c6e1c88de9759f5ec9