Crontab '@reboot' to start Seattle does not work for all crond (e.g. Busybox)

[choksi81]

The (linux) seattle installer creates a crontab entry @reboot to start seattle on system startup. But not all crond implementations provide the @reboot tag.

E.g. OpenWRT, a Linux distribution for embedded devices, uses the Busybox crond implementation, which does not support @reboot. See OpenWRT ticket

In order to make seattle start automatically on system startup, I manually created a /etc/init.d start script, which works fine.
This should be integrated in seattleinstaller.py.

So far I can identify 2 todos:

• replace the crontab entry by an init.d start script at installation (for these specific systems)
• modify the 'already installed' check, which relies on the crontab entry

If one does not mind a crontab zombie, there would only be 1 todo:

• add the init.d start script additionally to the crontab entry