Why did edgy->feisty install mdadm (I don't have RAID)?

[Derek Broughton]

Adam Funk wrote:

> On 2007-04-25, Derek Broughton wrote:
> 
>>> I don't have any RAID drives, but the upgrade from Edgy to Feisty
>>> installed mdadm.  (A friend reported the same thing.)
>>> 
>>> Anyone know why?  And is there any reason not to remove it?
>>
>> I didn't think it was possible to have a default edgy without mdadm,
>> either - at least I stopped fighting it before edgy was officially
>> released.
>>
>> There's no reason not to remove it if you don't have RAID - but it will
>> remove some of the virtual packages that the upgrade folks tell us we
>> need for the next clean upgrade (but definitely don't need _until_ then).
> 
> Curiously, I recently got the following cron message!
> 
> 
> Subject: Cron <root at floo> [ -x /usr/share/mdadm/checkarray ] && [ $(date
> +%d) -le 7 ] && /usr/share/mdadm/checkarray --cron --all --quiet
> 
> checkarray: W: no active MD arrays found.
> checkarray: W: (maybe uninstall the mdadm package?)

Ah.  I just had an idea.  Usually I use aptitude for updating.  Today I
used "apt-get --purge remove mdadm" and it removed mdadm without affecting
anything else.  Last time I removed mdadm with aptitude and it removed one
of the virtual packages - presumably because it was a "Recommends". 
Aptitude install "Recommends" packages by default, but apt-get doesn't.
-- 
derek