Your message dated Fri, 2 Oct 2015 23:44:55 +0100
with message-id <[email protected]>
and subject line Re: Bug#680822: aptitude fails to install libphonon-dev and
phonon-backend-gstreamer
has caused the Debian Bug report #680822,
regarding aptitude fails to install libphonon-dev and phonon-backend-gstreamer
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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680822: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=680822
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Contact [email protected] with problems
--- Begin Message ---
Source: pyside
Version: 1.1.1-3
Severity: serious
Tags: wheezy sid
User: [email protected]
Usertags: qa-ftbfs-20120814 qa-ftbfs
Justification: FTBFS in wheezy on amd64
Hi,
During a rebuild of all packages in *wheezy*, your package failed to
build on amd64.
Relevant part:
> ┌──────────────────────────────────────────────────────────────────────────────┐
> │ Install pyside build dependencies (apt-based resolver)
> │
> └──────────────────────────────────────────────────────────────────────────────┘
>
> Installing build dependencies
> Reading package lists...
> Building dependency tree...
> Reading state information...
> Some packages could not be installed. This may mean that you have
> requested an impossible situation or if you are using the unstable
> distribution that some required packages have not yet been created
> or been moved out of Incoming.
> The following information may help to resolve the situation:
>
> The following packages have unmet dependencies:
> sbuild-build-depends-pyside-dummy : Depends: libphonon-dev but it is not
> going to be installed
> E: Unable to correct problems, you have held broken packages.
> apt-get failed.
The full build log is available from:
http://people.debian.org/~lucas/logs/2012/08/14/pyside_1.1.1-3_wheezy.log
A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!
About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.
--- End Message ---
--- Begin Message ---
2012-11-28 05:32 Daniel Hartwig:
Control: tags -1 + moreinfo
Note that the initial report concerns sbuild calling apt-get to install
build-dependencies *indirectly* via a dummy-build-depends package. The
second message is a test case, where aptitude is asked to *directly*
install specific packages. These two modes are not equivalent; even if
both were using aptitude, the algorithms for each mode have subtle
differences.
Evgeni Golov <[email protected]> wrote:
`aptitude install libphonon-dev phonon-backend-gstreamer` gives
The following packages have unmet dependencies:
phonon-backend-null : Conflicts: phonon-backend which is a virtual package.
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) libphonon-dev [Not Installed]
2) phonon-backend-null [Not Installed]
(cowbuilder aborts here).
However, `apt-get install libphonon-dev phonon-backend-gstreamer` works just
fine.
The solution offered by aptitude is a valid resolution for the conflict.
For reference, subsequent offers are:
Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) phonon-backend-gstreamer [Not Installed]
Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:
Install the following packages:
1) phonon [4:4.6.0.0-2 (unstable)]
Keep the following packages at their current version:
2) phonon-backend-null [Not Installed]
and this third one appears equivalent to how apt-get resolves the same
request.
Evgeni Golov <[email protected]> continues:
Not sure why it tries phonon-backend-null at all (I requested
phonon-backend-gstreamer), but I think this is because libphonon-dev
depends on
phonon-backend-null | phonon
and not
phonon-backend-null | phonon-backend
Yes, that is why it tries to install -null.
Aptitude and it's dependency solver are intended mainly for interactive
use. It is not a bug simply because aptitude may attempt to handle a
request with a different set of installs to apt-get, or initially
suggests a different resolution to a particular conflict than apt-get
would take.
Regarding the assignment to aptitude, Neil Williams
<[email protected]> wrote:
… this does look
like aptitude just not handling the Provides: Conflicts: correctly
1) Aptitude is asked to install libphonon-dev and
phonon-backend-gstreamer.
2) There is no requirement to resolve dependencies of packages in any
particular order.
3) Aptitude chooses to install phonon-backend-null to satisfy a
dependency of libphonon-dev.
4) Aptitude does not consider that -null conflicts with itself via
the virtual package phonon-backend. Debian Policy requires that
self-conflicts via virtual packages are ignored.
5) Aptitude does recognize that -null conflicts with -gstreamer via
phonon-backend. This conflict is reported.
6) Various solutions to (5) are offered. The first few of these appear
to be valid and the third covers the solutions that apt-get would
find.
Can you be more precise about how aptitude has “not handled the
Provides: Conflicts: correctly”? (4) and (5) seem correct to me.
when
other parsers are not affected.
The different behaviour of apt-get and aptitude is due to differences in
how they choose to satisfy dependencies and resolve conflicts that
arise. This does not imply that either program is broken.
No more info provided upon request and the problem does not look like a
bug in aptitude anyway. After 3 years I think that it's reasonable to
close this bug report.
Cheers.
--
Manuel A. Fernandez Montecelo <[email protected]>
--- End Message ---
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