Watch directory change with Python watchdog library ·

Watchdog is Python API and shell utilities to monitor file system events.

Watchdog come with a tool call watchmedo to call shell command when we get change on a directiory. The “change” include: delete/modify/create a file in directory.

For example, i want to terminate a tornaldo server (which was run by supervise tool) everytime i change a python file. Here i what i make

I create a file /service/tornaldo-local/run

#!/usr/bin/env sh
TORNADO_PID=/var/run/tonardo.pid

export PYTHONPATH=$PYTHONPATH:/home/vagrant/current

. /home/vagrant/current/bin/envvars.local.sh

exec /usr/bin/python /usr/local/bin/watchmedo shell-command \
    --patterns="*.py;*.sh" \
    --recursive \
    --command="pgrep -f '/*manage.py' | xargs kill -9" \
    `ls -l /home/vagrant | grep current | awk '{print $11}'`/.. 2>&1 >/dev/null &
exec /usr/bin/python /home/vagrant/current/bin/manage.py start >> /var/log/tornado/tornado-local.log 2>&1

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