pkgbinarymanager: symlink_doc should ignore dependencies part of an alternative set

[Laurent Bonnaud]

Hi,

here is the problem:

$ symlinks /usr/share/doc/ffmpeg/
dangling: /usr/share/doc/ffmpeg/changelog.Debian.gz -> ../libavcodec57/changelog.Debian.gz

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ffmpeg 7:3.4.2-1build1
Uname: Linux 4.15.15-041515-generic x86_64
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CurrentDesktop: MATE
Date: Wed Apr 4 20:10:55 2018
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ffmpeg
UpgradeStatus: No upgrade log present (probably fresh install)

[James Cowgill (jcowgill)]

Does running "apt-get -f install" help. For some reason you don't have libavcodec57 installed even though it is a dependency of ffmpeg.

[Laurent Bonnaud (laurent-bonnaud)]

> Does running "apt-get -f install" help.

No because my system has no package dependency problems.

What happens on my system is that libavcodec-extra57 is installed instead of libavcodec57.

[James Cowgill (jcowgill)]

Thanks that makes more sense.

The bug is in Ubuntu's pkgbinarymangler which is responsible for symlinking these changelogs. It seems to think that libavcodec57 is a dependency of ffmpeg, but in fact libavcodec57 is part of a set of alternatives where libavcodec-extra57 could be installed instead. I think pkgbinarymangler should ignore any dependencies part of an alternative set (ie containing a "|" character) which should fix this.

[Laurent Bonnaud (laurent-bonnaud)]

This bug still exists in Ubuntu 19.04/disco:

$ symlinks /usr/share/doc/ffmpeg/
dangling: /usr/share/doc/ffmpeg/changelog.Debian.gz -> ../libavcodec58/changelog.Debian.gz

[Laurent Bonnaud (laurent-bonnaud)]

This bug still exists in hirsute:

$ symlinks /usr/share/doc/ffmpeg/
dangling: /usr/share/doc/ffmpeg/changelog.Debian.gz -> ../libavcodec58/changelog.Debian.gz

[Laurent Bonnaud (laurent-bonnaud)]

This bug still exists in lunar:

$ symlinks /usr/share/doc/ffmpeg/
dangling: /usr/share/doc/ffmpeg/changelog.Debian.gz -> ../libavcodec59/changelog.Debian.gz

[Laurent Bonnaud (laurent-bonnaud)]

This bug still exists in mantic:

$ symlinks /usr/share/doc/ffmpeg/
dangling: /usr/share/doc/ffmpeg/changelog.Debian.gz -> ../libavcodec60/changelog.Debian.gz