[gentoo-user] Remove prelink and purge prelinked exec

[gentoo-user] Remove prelink and purge prelinked exec

[Marco Calviani]

Hi list,
   i would like to remove prelink and put the system to the state it
has before the prelink procedure. I've read that a

# prelink -ua

can do the job but i would have some suggestions from you all. It is
enough to behave like this?

Regards,
mc
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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Jesús Guerrero]

El Domingo, 12 de Noviembre de 2006 20:58, Marco Calviani escribió:
> Hi list,
>    i would like to remove prelink and put the system to the state it
> has before the prelink procedure. I've read that a
>
> # prelink -ua
>
> can do the job but i would have some suggestions from you all. It is
> enough to behave like this?
>
> Regards,
> mc

I never trusted prelink. So, I dont trust it to un-prelink either. 

The best way to make sure your binaries are not altered by 3rd party tools is 
this:

emerge -euD world

Regards, Jesús.

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Marco Calviani]

Hi,

> emerge -euD world

but: is this going to recompile everything (e option) or only those
that needs upgrade?

Regards,
mc
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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Dale]

Marco Calviani wrote:
> Hi,
>
>> emerge -euD world
>
> but: is this going to recompile everything (e option) or only those
> that needs upgrade?
>
> Regards,
> mc
>        --emptytree (-e)
>               Reinstalls all world packages and their dependencies to
> the  current  USE
>               specifications while differing from the installed set of
> packages as lit-
>               tle as possible.  You should run with --pretend first
> to  make  sure  the
>               result is what you expect.

That recompiles everything on your system. 

Dale

:-)  :-)

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Jesús Guerrero]

El Mon, 13 Nov 2006 07:29:07 +0100
"Marco Calviani" <marco.calviani@gmail.com> escribió:

> Hi,
> 
> > emerge -euD world
> 
> but: is this going to recompile everything (e option) or only those
> that needs upgrade?
> 
> Regards,
> mc

Everything, but, except for the few packages that are binary-only or
docs-only. The two lists ("everything" and "what needs to be
recompiled") do have the same elements.

Jesús.

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Uwe Thiem]

On 12 November 2006 22:40, Jesús Guerrero wrote:

> I never trusted prelink. So, I dont trust it to un-prelink either.

Just out of curiosity: Why? As in "it doesn't do its job" or as in "it makes 
the system unstable"?

My whole system is prelinked and it is very stable. Startup times of C++ 
applications are shorter.

>
> The best way to make sure your binaries are not altered by 3rd party tools
> is this:
>
> emerge -euD world

Probably right.

Uwe

-- 
Mark Twain: I rather decline two drinks than a German adjective.
http://www.SysEx.com.na
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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Bo Ørsted Andresen]

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On Sunday 12 November 2006 21:40, Jesús Guerrero wrote:
> I never trusted prelink. So, I dont trust it to un-prelink either.
>
> The best way to make sure your binaries are not altered by 3rd party tools
> is this:
>
> emerge -euD world

This is slightly amusing. Remerging every package while prelink is still 
installed will use prelink again... Also --update and --deep are ignored 
with --emptytree. Finally --unmerge of any prelinked package would fail the 
checksum and the binaries would be left alone if prelink --undo didn't work. 
But because portage does prelink --undo (which works) before checking the 
checksum --unmerge works just fine...

-- 
Bo Andresen

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Uwe Thiem]

On 13 November 2006 14:44, Bo Ørsted Andresen wrote:
> On Sunday 12 November 2006 21:40, Jesús Guerrero wrote:
> > I never trusted prelink. So, I dont trust it to un-prelink either.
> >
> > The best way to make sure your binaries are not altered by 3rd party
> > tools is this:
> >
> > emerge -euD world
>
> This is slightly amusing. Remerging every package while prelink is still
> installed will use prelink again... 

Only if PRELINKING in /etc/conf.d/prelink is set to "yes". I prefer to do my 
prelinking myself, so I set it to "no" - and emerge keeps its hand off 
prelink.

Uwe

-- 
Mark Twain: I rather decline two drinks than a German adjective.
http://www.SysEx.com.na
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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Bo Ørsted Andresen]

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On Monday 13 November 2006 14:22, Uwe Thiem wrote:
> On 13 November 2006 14:44, Bo Ørsted Andresen wrote:
> > On Sunday 12 November 2006 21:40, Jesús Guerrero wrote:
> > > I never trusted prelink. So, I dont trust it to un-prelink either.
> > >
> > > The best way to make sure your binaries are not altered by 3rd party
> > > tools is this:
> > >
> > > emerge -euD world
> >
> > This is slightly amusing. Remerging every package while prelink is still
> > installed will use prelink again...
>
> Only if PRELINKING in /etc/conf.d/prelink is set to "yes". I prefer to do
> my prelinking myself, so I set it to "no" - and emerge keeps its hand off
> prelink.

Yes, I missed that. Portage just adds to the list of locations 
in /etc/prelink.conf that should be prelinked if PRELINKING is set to yes. 
And during unmerge is runs prelink --undo as already mentioned. So if 
PRELINKING is set to yes then setting it to no is actually all that is 
required:

# head -n 4 /etc/conf.d/prelink
# Set this to no to disable prelinking altogether
# (if you change this from yes to no prelink -ua
# will be run next night to undo prelinking)
PRELINKING=yes

And if it is set to no then `prelink -ua` is sufficient to undo manual 
prelinking.

-- 
Bo Andresen

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Jesús Guerrero]

El Mon, 13 Nov 2006 15:22:25 +0200
Uwe Thiem <uwix@iway.na> escribió:

> On 13 November 2006 14:44, Bo Ørsted Andresen wrote:
> > On Sunday 12 November 2006 21:40, Jesús Guerrero wrote:
> > > I never trusted prelink. So, I dont trust it to un-prelink either.
> > >
> > > The best way to make sure your binaries are not altered by 3rd
> > > party tools is this:
> > >
> > > emerge -euD world
> >
> > This is slightly amusing. Remerging every package while prelink is
> > still installed will use prelink again... 
> 
> Only if PRELINKING in /etc/conf.d/prelink is set to "yes". I prefer
> to do my prelinking myself, so I set it to "no" - and emerge keeps
> its hand off prelink.
> 
> Uwe
> 

Thank you for pointing that out. 

Small detail that I bypassed. :P

Jesús.

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Re: [gentoo-user] Remove prelink and purge prelinked exec

[Bo Ørsted Andresen]

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On Sunday 12 November 2006 20:58, Marco Calviani wrote:
> Hi list,
>    i would like to remove prelink and put the system to the state it
> has before the prelink procedure. I've read that a
>
> # prelink -ua
>
> can do the job but i would have some suggestions from you all. It is
> enough to behave like this?

Gentoo provides a prelink howto [1]. But the bottom line is you need to do:

# prelink -ua && emerge -Cva prelink

As long as prelink is installed portage will use it...

[1] http://www.gentoo.org/doc/en/prelink-howto.xml

-- 
Bo Andresen

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