Bug#35714: anacron and cron both run cron.daily !

[Ian Jackson <ian@davenant.greenend.org.uk>]

Julian Gilbey writes ("Re: Bug#35714: anacron and cron both run cron.daily !"):
> > See the messages below, which seem to be due to anacron and cron both
> > running cron.daily at the same time.
> 
> This is an ongoing discussion on -devel.  One suggestion which I made
> based on some other people's ideas was for anacron to use dpkg-divert
> to divert cron's crontab and to replace it with its own.  I'm not sure
> how that sounds, though.

Don't try to divert a conffile.  Ew! Erg! Disaster!  Well, likely
braindamage, anyway.  I'd give you 50/50 that dpkg would DTRT, and
then 2:1 against all the relevant maintainer scripts getting it right,
so we're down to a 1 in 6 chance of it working without evaporating
people's crontabs ...

> I prefer your suggestion of having 4 lines in crontab: three for
> cron.{daily,...} which only run in the absence of anacron, and the
> fourth to run anacron if it is present.

Glad you agree.  Don't forget to check for the anacron binary, rather
than just its conffiles.

Ian.