Re: [gentoo-user] re: resolving blocked packages [media-video/ffmpeg-1.2:0]

[Daniel Campbell <lists@sporkbox.us>]

On 11/02/2013 02:06 PM, Alexander Kapshuk wrote:
> On 11/02/2013 05:29 PM, Daniel Campbell wrote:
>> On 11/02/2013 06:07 AM, Alan McKinnon wrote:
>>> On 02/11/2013 12:49, Daniel Campbell wrote:
>>>> On 10/27/2013 12:08 PM, Alexander Kapshuk wrote:
>>>>> As I ran 'emerge --ask --update --deep --with-bdeps=y --newuse world', I
>>>>> got the message below.
>>>>>
>>>>> These are the packages that would be merged, in order:
>>>>>
>>>>> Calculating dependencies... done!
>>>>> [ebuild  N     ] dev-scheme/guile-1.8.8-r1  USE="deprecated nls regex
>>>>> threads -debug -debug-freelist -debug-malloc -discouraged -emacs
>>>>> -networking"
>>>>> [ebuild  N     ] sys-devel/autogen-5.15
>>>>> [ebuild     U ~] net-libs/gnutls-3.2.5 [2.12.23-r1] USE="-dane%"
>>>>> LINGUAS="-cs% -de% -en% -fi% -fr% -it% -ms% -nl% -pl% -sv% -uk% -vi%
>>>>> -zh_CN%"
>>>>> [ebuild  N     ] media-libs/libpostproc-0.8.0.20121125  USE="-3dnow
>>>>> (-altivec) -mmx -mmxext -pic -static-libs"
>>>>> [ebuild     U ~] media-video/vlc-2.1.0 [2.0.9] USE="-chromaprint% -fdk%
>>>>> -opencv% (-qt5) -rdp% {-test%} -vdpau%"
>>>>> [blocks B      ] <media-video/ffmpeg-1.2:0 ("<media-video/ffmpeg-1.2:0"
>>>>> is blocking media-video/vlc-2.1.0)
>>>>> [blocks B      ] media-video/ffmpeg:0 ("media-video/ffmpeg:0" is
>>>>> blocking media-libs/libpostproc-0.8.0.20121125)
>>>>> [blocks B      ] media-libs/libpostproc ("media-libs/libpostproc" is
>>>>> blocking media-video/ffmpeg-1.0.7)
>>>>>
>>>>> !!! Multiple package instances within a single package slot have been pulled
>>>>> !!! into the dependency graph, resulting in a slot conflict:
>>>>>
>>>>> net-libs/gnutls:0
>>>>>
>>>>>   (net-libs/gnutls-3.2.5::gentoo, ebuild scheduled for merge) pulled in by
>>>>>     >=net-libs/gnutls-3.0.20:0 required by
>>>>> (media-video/vlc-2.1.0::gentoo, ebuild scheduled for merge)
>>>>>
>>>>>   (net-libs/gnutls-2.12.23-r1::gentoo, installed) pulled in by
>>>>>     (no parents that aren't satisfied by other packages in this slot)
>>>>>
>>>>>
>>>>> It may be possible to solve this problem by using package.mask to
>>>>> prevent one of those packages from being selected. However, it is also
>>>>> possible that conflicting dependencies exist such that they are
>>>>> impossible to satisfy simultaneously.  If such a conflict exists in
>>>>> the dependencies of two different packages, then those packages can
>>>>> not be installed simultaneously. You may want to try a larger value of
>>>>> the --backtrack option, such as --backtrack=30, in order to see if
>>>>> that will solve this conflict automatically.
>>>>>
>>>>> For more information, see MASKED PACKAGES section in the emerge man
>>>>> page or refer to the Gentoo Handbook.
>>>>>
>>>>>
>>>>>  * Error: The above package list contains packages which cannot be
>>>>>  * installed at the same time on the same system.
>>>>>
>>>>>   (media-video/vlc-2.1.0::gentoo, ebuild scheduled for merge) pulled in by
>>>>>     media-video/vlc required by @selected
>>>>>
>>>>>   (media-video/ffmpeg-1.0.7::gentoo, installed) pulled in by
>>>>>    
>>>>>> =media-video/ffmpeg-0.10.3:0[X?,encode?,gsm?,jpeg2k?,mp3?,sdl?,speex?,theora?,threads?,truetype?,vaapi?,vdpau?,x264?]
>>>>> (>=media-video/ffmpeg-0.10.3:0[X,encode,mp3,sdl,truetype,x264]) required
>>>>> by (virtual/ffmpeg-0.10.3::gentoo, installed)
>>>>>
>>>>>
>>>>> For more information about Blocked Packages, please refer to the following
>>>>> section of the Gentoo Linux x86 Handbook (architecture is irrelevant):
>>>>>
>>>>> http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked
>>>>>
>>>>>
>>>>> The following keyword changes are necessary to proceed:
>>>>>  (see "package.accept_keywords" in the portage(5) man page for more details)
>>>>> # required by media-video/vlc-2.1.0[gnutls]
>>>>> # required by @selected
>>>>> # required by @world (argument)
>>>>> =net-libs/gnutls-3.2.5 ~x86
>>>>>
>>>>> Use --autounmask-write to write changes to config files (honoring
>>>>> CONFIG_PROTECT). Carefully examine the list of proposed changes,
>>>>> paying special attention to mask or keyword changes that may expose
>>>>> experimental or unstable packages.
>>>>> ----------------------------------------------
>>>>> After reading the 'Blocked Packages' found here,
>>>>> http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked,
>>>>> would updating media-video/ffmpeg to version 1.2 [the current version of
>>>>> ffmpeg is 1.0.7], fix the blockage?
>>>>>
>>>>> Any input would be much appreciated.
>>>>>
>>>>>
>>>> It looks like you just need to add `net-libs/gnutls` to
>>>> /etc/portage/package.accept_keywords, which will fetch the testing
>>>> version of gnutls. Is your version of vlc also from testing? That may be
>>>> why emerge is complaining. I also noticed a lot of -USE% flags, which
>>>> tells me they were removed. Did you change USE flags at the same time
>>>> you attempted this update? There's no problem with that, of course, but
>>>> it can complicate upgrades sometimes. :)
>>>>
>>>> Hope that helps.
>>>>
>>>
>>> The basic problem is a stable system with a bunch of unstable packages
>>> installed.
>>>
>>> The requested vlc version is ~arch, which wants a ~arch version of
>>> gnutls. This conflicts with other stable packages that want a stable
>>> version of gnutls.
>>>
>>> Mixing and matching arch and ~arch like this often causes unsolveable
>>> problems, especially with basic libs like gnutls used by lots of
>>> packages. In this specific case, I doubt very much that the problem is
>>> solveable. Either make the entire system ~arch or downgrade vlc to
>>> stable. Mixing is not recommended, not that it won't work (it often
>>> does), but because users so often run into these problems and devs
>>> usually will not help fix it. The user is thus totally on tehir own with
>>> this one.
>>>
>>>
>> Ah, I wasn't aware that it wasn't a supported thing. Good points; the
>> testing necessary to support mixed systems is more than any dev team
>> could handle realistically. I mix and match, but only for a select few
>> packages that simply don't have a stable version.
>>
>> Alex: In order to get ~arch vlc, you had to put vlc in your
>> package.accept_keywords file. Try removing that to go back to the stable
>> build and see if that corrects things. If not, then I agree with Alan
>> and you should probably make the big decision of stable or testing.
>>
> Thanks very much for your responses to my original query.
> 
> What I did do prior to getting your responses was try and resolve the
> dependency conflict as shown below.
> 
> (1). I added '=net-libs/gnutls-3.2.5 ~x86' and
> '=media-video/ffmpeg-1.2.4 ~x86' to package.accept_keywords:
> box0=; egrep 'gnutls|ffmpeg' /etc/portage/package.accept_keywords
> =net-libs/gnutls-3.2.5 ~x86
> =media-video/ffmpeg-1.2.4 ~x86
> (2). I then updated 'media-video/ffmpeg' to version
> 'media-video/ffmpeg-1.2.4', like so:
> emerge --ask '>media-video/ffmpeg-1.0.7'
> !!! existing preserved libs:
>>>> package: media-video/ffmpeg-1.2.4
>  *  - /usr/lib/libavutil.so.51
>  *  - /usr/lib/libavutil.so.51.73.101
>  *      used by /usr/bin/mencoder (media-video/mplayer-1.1.1-r1)
>  *      used by /usr/bin/mplayer (media-video/mplayer-1.1.1-r1)
>  *      used by /usr/lib/vlc/plugins/codec/libavcodec_plugin.so
> (media-video/vlc-2.0.9)
>  *      used by /usr/lib/vlc/plugins/demux/libavformat_plugin.so
> (media-video/vlc-2.0.9)
> Use emerge @preserved-rebuild to rebuild packages using these libraries
> (3). I then pulled in the other updates:
> emerge --ask --update --deep --with-bdeps=y --newuse world
> (4). Rebuilt the preserved libs as recorded in
> /var/lib/portage/preserved_libs_registry
> emerge --ask @preserved-rebuild
> 
> So far, the whole system seems to be running OK.
> 
> It did occur to me afterwards, like Alan and Daniel suggested, that
> mixing stable and unstable packages was not a good idea.
> 
> I put vlc ~x86 in package.keywords as instructed here,
> http://www.videolan.org/vlc/download-gentoo.html.
> box0=; cat /etc/portage/package.keywords
> media-video/vlc ~x86
> 
> Turns out, it wasn't such a good idea after all.
> 
> What would I have to do to downgrade vlc, gnutls and ffmpeg to the
> stable versions of the packages?
> I guess I'd have to remove their respective entries from
> /etc/portage/package.(accept)_keywords.
> box0=; cat /etc/portage/package.keywords
> media-video/vlc ~x86
> box0=; cat /etc/portage/package.accept_keywords
> =net-im/skype-4.2.0.11-r1 ~x86
> =sys-devel/gettext-0.18.3.1-r1 ~x86
> =net-libs/gnutls-3.2.5 ~x86
> =media-video/ffmpeg-1.2.4 ~x86
> 
> How would I instruct emerge to do that properly?
> 
> Thanks.
> 
> 

Well, if you don't mind managing the dependencies of an ~arch vlc, then
by all means keep your setup! When it breaks though, you get to keep the
pieces. :)

For starters, you should probably merge package.keywords into
package.accept_keywords; the latter is the "new" standard name, though
Portage will likely support the old names for a while. Just a heads-up
on that.

If you want to revert to stable, just remove the lines from the file
that match the packages that you want to be stable again. For vlc,
that'd mean vlc, gnutls, and ffmpeg need to be removed from the file.

As an aside, is there a particular reason you have gettext keyworded?