Re: [gentoo-user] emerge --update behavior

[Michael Orlitzky]

On 01/02/2012 11:16 AM, Michael Mol wrote:
>>
>> Fine for your home PC, doesn't cut it on servers. I have the following in
>> one of my world files:
>>
>>   dev-php/PEAR-Mail
>>   dev-php/PEAR-Mail_Mime
>>   dev-php/PEAR-PEAR
>>   dev-php/PEAR-Structures_Graph
>>
>> which of those do I want? At least one of them was installed to support a
>> customer's custom PHP application. Maybe all of them were and they all
>> belong in world. No one knows, this server is older than the current
>> --update behavior.
>>
>> So which ones can I remove?
>>
>> Solutions involving time travel and/or losing customers will be
>> disqualified.
>
> Make a backup copy of your world file.
>
> 1a. Remove those four lines.
> 2a. emerge -p --depclean
> 3a. Did any of those show up in the to-be-removed set? Add them back.
>
> Alternately:
> 1b. emerge -pev --tree --with-bdeps=y @world
> 2b Find those packages in the output. The tree form of the display
> will help you see if anything is depending on them.
> 3b. If anything is depending on them, you should be able to safely
> remove them from your world file. I'd follow up with the 1a, 2a, 3a
> solution to be sure.
>

Sorry, but these won't work.

Let's say that dev-php/PEAR-Mail_Mime has a dependency on 
dev-php/PEAR-Mail, but I have a customer who needs dev-php/PEAR-Mail for 
a contact form.

Following your process, I would remove dev-php/PEAR-Mail from my world 
file. If I ever remove dev-php/PEAR-Mail_Mime, depclean will remove 
PEAR-Mail and break the guy's site.