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

[Daniel Campbell]

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.