[gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Zac Medico]

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Please review the attached news item which announces the preserve-libs 
default for portage-2.1.12. Note that our council has discussed this 
change in their 2013-05-14 meeting [1], and they were in favor of 
allowing it.

[1] http://thread.gmane.org/gmane.linux.gentoo.project/2448/focus=2452
-- 
Thanks,
Zac

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Title: Portage preserve-libs default
Author: Zac Medico <zmedico@gentoo.org>
Content-Type: text/plain
Posted: 2012-06-07
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: >=sys-apps/portage-2.1.12

Beginning with sys-apps/portage-2.1.12, FEATURES=preserve-libs is enabled by
default. This feature will preserve libraries when the sonames change during
upgrade or downgrade. Libraries are preserved only if consumers of those
libraries are detected. Preserved libraries are automatically removed when
there are no remaining consumers. Run `emerge @preserved-rebuild` in order to
rebuild all consumers of preserved libraries.

If you would like to disable this behavior by default, then set
FEATURES="-preserve-libs" in make.conf. See the make.conf(5) man page for more
information about this feature.

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Markos Chandras]

On 3 June 2013 01:41, Zac Medico <zmedico@gentoo.org> wrote:
> Please review the attached news item which announces the preserve-libs
> default for portage-2.1.12. Note that our council has discussed this change
> in their 2013-05-14 meeting [1], and they were in favor of allowing it.
>
> [1] http://thread.gmane.org/gmane.linux.gentoo.project/2448/focus=2452
> --
> Thanks,
> Zac

Looks good to me.

--
Regards,
Markos Chandras - Gentoo Linux Developer
http://dev.gentoo.org/~hwoarang

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Alex Alexander]

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On Sun, Jun 02, 2013 at 05:41:21PM -0700, Zac Medico wrote:
> Please review the attached news item which announces the preserve-libs 
> default for portage-2.1.12. Note that our council has discussed this 
> change in their 2013-05-14 meeting [1], and they were in favor of 
> allowing it.
> 
> [1] http://thread.gmane.org/gmane.linux.gentoo.project/2448/focus=2452
> -- 
> Thanks,
> Zac

> Title: Portage preserve-libs default
> Author: Zac Medico <zmedico@gentoo.org>
> Content-Type: text/plain
> Posted: 2012-06-07
> Revision: 1
> News-Item-Format: 1.0
> Display-If-Installed: >=sys-apps/portage-2.1.12
> 
> Beginning with sys-apps/portage-2.1.12, FEATURES=preserve-libs is enabled by
> default. This feature will preserve libraries when the sonames change during
> upgrade or downgrade. Libraries are preserved only if consumers of those
> libraries are detected. Preserved libraries are automatically removed when
> there are no remaining consumers. Run `emerge @preserved-rebuild` in order to
> rebuild all consumers of preserved libraries.
> 
> If you would like to disable this behavior by default, then set
> FEATURES="-preserve-libs" in make.conf. See the make.conf(5) man page for more
> information about this feature.

Looks good. Perhaps you'd like to add that this replaces revdep-rebuild
in case it's not obvious to some users.

By the way: Whoooo hoooo xD
I almost believed this would never happen.

-- 
Alex Alexander | wired
+ Gentoo Linux Developer
++ www.linuxized.com

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Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Tom Wijsman]

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On Sun, 02 Jun 2013 17:41:21 -0700
Zac Medico <zmedico@gentoo.org> wrote:

I'll answer to some parts with what I think the user might think; I
know the answer to most of those, but the user might not.

> Beginning with sys-apps/portage-2.1.12, FEATURES=preserve-libs is
> enabled by default. This feature will preserve libraries when the
> sonames change during upgrade or downgrade.

Why are libraries being preserved?

> Libraries are preserved only if consumers of those libraries are
> detected.

When exactly are those consumers detected?

> Preserved libraries are automatically removed when there are no
> remaining consumers.

When exactly does this happen? At the end of any emerge action?

> Run `emerge @preserved-rebuild` in order to rebuild all consumers of
> preserved libraries.

When and why? Do I run this once? Do I need to run this often?

Besides these questions, the transition from revdep-rebuild to
@preserved-rebuild may be worth a note as well; if I remember correctly
you have to do one last revdep-rebuild when you enable this feature, or
in other words preserve-libs won't detect present inconsistencies. I
feel like this should probably be documented as well, as part of
mentioning that this is intended to replace revdep-rebuild...

-- 
With kind regards,

Tom Wijsman (TomWij)
Gentoo Developer

E-mail address  : TomWij@gentoo.org
GPG Public Key  : 6D34E57D
GPG Fingerprint : C165 AF18 AB4C 400B C3D2  ABF0 95B2 1FCD 6D34 E57D

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Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Rick "Zero_Chaos" Farina]

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Hash: SHA1

On 06/03/2013 06:32 AM, Tom Wijsman wrote:
> On Sun, 02 Jun 2013 17:41:21 -0700
> Zac Medico <zmedico@gentoo.org> wrote:
> 

The news item is good, but I agree with Tom there could be more
questions.  Maybe adding a link to some page which explains the
functionality in detail?

- -Zero
> I'll answer to some parts with what I think the user might think; I
> know the answer to most of those, but the user might not.
> 
>> Beginning with sys-apps/portage-2.1.12, FEATURES=preserve-libs is
>> enabled by default. This feature will preserve libraries when the
>> sonames change during upgrade or downgrade.
> 
> Why are libraries being preserved?
> 
>> Libraries are preserved only if consumers of those libraries are
>> detected.
> 
> When exactly are those consumers detected?
> 
>> Preserved libraries are automatically removed when there are no
>> remaining consumers.
> 
> When exactly does this happen? At the end of any emerge action?
> 
>> Run `emerge @preserved-rebuild` in order to rebuild all consumers of
>> preserved libraries.
> 
> When and why? Do I run this once? Do I need to run this often?
> 
> Besides these questions, the transition from revdep-rebuild to
> @preserved-rebuild may be worth a note as well; if I remember correctly
> you have to do one last revdep-rebuild when you enable this feature, or
> in other words preserve-libs won't detect present inconsistencies. I
> feel like this should probably be documented as well, as part of
> mentioning that this is intended to replace revdep-rebuild...
> 

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Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Zac Medico]

On 06/03/2013 03:32 AM, Tom Wijsman wrote:
> On Sun, 02 Jun 2013 17:41:21 -0700
> Zac Medico <zmedico@gentoo.org> wrote:
>
> I'll answer to some parts with what I think the user might think; I
> know the answer to most of those, but the user might not.

The news item now includes a link to this wiki page which we can use to 
answer all of the questions that may arise:

   http://wiki.gentoo.org/wiki/Preserve-libs

> Besides these questions, the transition from revdep-rebuild to
> @preserved-rebuild may be worth a note as well; if I remember correctly
> you have to do one last revdep-rebuild when you enable this feature, or
> in other words preserve-libs won't detect present inconsistencies. I
> feel like this should probably be documented as well, as part of
> mentioning that this is intended to replace revdep-rebuild...

Yeah. The news item now advises the user that it's a good practice to 
run revdep-rebuild anyway, just to be safe.
-- 
Thanks,
Zac

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Pacho Ramos]

El lun, 03-06-2013 a las 17:24 -0700, Zac Medico escribió:
[...]
> Yeah. The news item now advises the user that it's a good practice to 
> run revdep-rebuild anyway, just to be safe.

I would also suggest people to report bugs when they find cases not
catched by preserve-libs as they can be a real bug (like bug #460826)

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Zac Medico]

On 06/03/2013 11:49 PM, Pacho Ramos wrote:
> El lun, 03-06-2013 a las 17:24 -0700, Zac Medico escribió:
> [...]
>> Yeah. The news item now advises the user that it's a good practice to
>> run revdep-rebuild anyway, just to be safe.
>
> I would also suggest people to report bugs when they find cases not
> catched by preserve-libs as they can be a real bug (like bug #460826)

Well, I already gave them an example bug report, so hopefully they'll 
take that as a clue. I don't feel like nagging them to file bugs.
-- 
Thanks,
Zac

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Samuli Suominen]

On 04/06/13 03:24, Zac Medico wrote:
> Yeah. The news item now advises the user that it's a good practice to
> run revdep-rebuild anyway, just to be safe.

And `revdep-rebuild --library libfoobar.so.0` is still useful,
unless Portage can replace targeted --library calls too?

Just saying I'm not seeing the command going away anytime soon ;-)

- Samuli

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Zac Medico]

On 06/04/2013 09:20 AM, Samuli Suominen wrote:
> On 04/06/13 03:24, Zac Medico wrote:
>> Yeah. The news item now advises the user that it's a good practice to
>> run revdep-rebuild anyway, just to be safe.
>
> And `revdep-rebuild --library libfoobar.so.0` is still useful,

This is for a ABI change without bumping the soname? It's possible to 
trigger rebuilds for that case by using sub-slots and slot-operators.

> unless Portage can replace targeted --library calls too?

No, portage doesn't have that, except when it's implied via sub-slots 
and slot-operators.

> Just saying I'm not seeing the command going away anytime soon ;-)

Yes, it could certainly be useful in some situations.
-- 
Thanks,
Zac

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Rich Freeman]

On Tue, Jun 4, 2013 at 4:51 PM, Zac Medico <zmedico@gentoo.org> wrote:
> This is for a ABI change without bumping the soname? It's possible to
> trigger rebuilds for that case by using sub-slots and slot-operators.

Or you could choose a longer-term solution like firebombing the
upstream maintainers...

Rich

Re: [gentoo-dev] Draft news item: preserve-libs default for portage-2.1.12

[Rick "Zero_Chaos" Farina]

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Hash: SHA1

On 06/04/2013 04:56 PM, Rich Freeman wrote:
> On Tue, Jun 4, 2013 at 4:51 PM, Zac Medico <zmedico@gentoo.org>
> wrote:
>> This is for a ABI change without bumping the soname? It's
>> possible to trigger rebuilds for that case by using sub-slots and
>> slot-operators.
> 
> Or you could choose a longer-term solution like firebombing the 
> upstream maintainers...
> 
HA! ++

- -Zero
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[gentoo-dev] Re: Draft news item: preserve-libs default for portage-2.1.12

[Zac Medico]

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Here's a revised version based on feedback. I've included a link to a 
wiki page about preserve-libs, where we can add answers to all of the 
questions that may arise:

   http://wiki.gentoo.org/wiki/Preserve-libs
-- 
Thanks,
Zac

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Title: Portage preserve-libs default
Author: Zac Medico <zmedico@gentoo.org>
Content-Type: text/plain
Posted: 2012-06-07
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: >=sys-apps/portage-2.1.12

Beginning with sys-apps/portage-2.1.12, FEATURES=preserve-libs is
enabled by default. Even though preserve-libs makes it unnecessary to
use revdep-rebuild for most common updates, it is still a good practice
to run `revdep-rebuild -ip` after updates, in order to check if there
are any broken library dependencies that preserve-libs was not able to
handle. For example, see http://bugs.gentoo.org/show_bug.cgi?id=459038.

If you would like to disable preserve-libs by default, then set
FEATURES="-preserve-libs" in make.conf. See the make.conf(5) man page
or the following wiki page for more information:

http://wiki.gentoo.org/wiki/Preserve-libs