Bug#904163: libavcodec-extra57 should PROVIDE package libavcodec57
Control: tags -1 -d-i Control: retitle -1 "Investigate the use of versioned provides in place of the alternative dependencies in shlibdeps" Control: severity -1 wishlist Hi James, On Sat, Jul 21, 2018 at 11:45 AM James Cowgill wrote: > Control: tags -1 - moreinfo > > Hi, > > On 21/07/18 16:23, Mattia Rizzolo wrote: > > On Sat, Jul 21, 2018 at 02:41:32PM +0100, James Cowgill wrote: > >> If versioned provides was working properly everywhere then > >> possibly it could be used, but I don't think it does yet (although I'm > >> happy to be corrected!). > > > > They do. In the past 2 years many bugs around the infrastructure were > > fixed and versioned provides can now be fully used (in particular, there > > were some last pieces regarding wanna-build and britney, that have been > > fixed ~1 year ago IIRC). > > > > The only thing is that they may be confusing to some, as it's not so > > straightforward to find a virtual package compared to a plain `apt show` > > :> > > OK thanks. I'll see what I can do about this after the ffmpeg 4.0 > transition has completed. > > Thanks for looking into this. If the infrastructure is in place for this now, and there are upsides with this approach then I agree that this should be evaluated, and the results documented in this ticket. The thing is, I'm not sure I understand the upsides. Discoverability is indeed a concern. How are users supposed to know what to install in order to get the extra functionality? Will meta-packages (think libavcodec-extra) help with picking up the right package? Does this also work for package upgrades, or are there situations where APT might prefer to remove the -extra variants in favor for base variant? My main concern with this proposal is the motivation behind it: To support 3rd party packages that have been compiled against a version of ffmpeg that is NOT found in Debian. I don't think this is something we should encourage. In the past, people have asked for help with the ffmpeg package and our reply is typically to replace 3rd party packages with the version found in Debian, which is frustrating, time-consuming and not in anyone's interest. Dirk, I think the right course of action to get your jitsi backport working is to contact the supplier of the jitsi package, and ask them to recompile the package without the use of 3rd party package archives. Feel free to point them to this email. -- regards, Reinhard
Bug#904163: libavcodec-extra57 should PROVIDE package libavcodec57
Control: tags -1 - moreinfo Hi, On 21/07/18 16:23, Mattia Rizzolo wrote: > On Sat, Jul 21, 2018 at 02:41:32PM +0100, James Cowgill wrote: >> If versioned provides was working properly everywhere then >> possibly it could be used, but I don't think it does yet (although I'm >> happy to be corrected!). > > They do. In the past 2 years many bugs around the infrastructure were > fixed and versioned provides can now be fully used (in particular, there > were some last pieces regarding wanna-build and britney, that have been > fixed ~1 year ago IIRC). > > The only thing is that they may be confusing to some, as it's not so > straightforward to find a virtual package compared to a plain `apt show` > :> OK thanks. I'll see what I can do about this after the ffmpeg 4.0 transition has completed. James signature.asc Description: OpenPGP digital signature
Bug#904163: libavcodec-extra57 should PROVIDE package libavcodec57
On Sat, Jul 21, 2018 at 02:41:32PM +0100, James Cowgill wrote: > If versioned provides was working properly everywhere then > possibly it could be used, but I don't think it does yet (although I'm > happy to be corrected!). They do. In the past 2 years many bugs around the infrastructure were fixed and versioned provides can now be fully used (in particular, there were some last pieces regarding wanna-build and britney, that have been fixed ~1 year ago IIRC). The only thing is that they may be confusing to some, as it's not so straightforward to find a virtual package compared to a plain `apt show` :> -- regards, Mattia Rizzolo GPG Key: 66AE 2B4A FCCF 3F52 DA18 4D18 4B04 3FCD B944 4540 .''`. more about me: https://mapreri.org : :' : Launchpad user: https://launchpad.net/~mapreri `. `'` Debian QA page: https://qa.debian.org/developer.php?login=mattia `- signature.asc Description: PGP signature
Bug#904163: libavcodec-extra57 should PROVIDE package libavcodec57
Control: tags -1 moreinfo Hi, On 20/07/18 23:14, Dirk Lehmann wrote: > Package: libavcodec-extra57 > Version: 7:3.4.3-1 > Severity: normal > Tags: d-i > > Dear Maintainer, > > I try to install a backport package which is depending on package > 'libavcodec57'. But I have installed the package libavcodec-extra57 > on my machine. If I try to install it, I get the following error: > > -- > root$> apt-get install jitsi > Reading package lists... Done > Building dependency tree > Reading state information... Done > Some packages could not be installed. This may mean that you have > requested an impossible situation or if you are using the unstable > distribution that some required packages have not yet been created > or been moved out of Incoming. > The following information may help to resolve the situation: > > The following packages have unmet dependencies: > jitsi : Depends: libavcodec57 but it is not going to be installed or > libavcodec-ffmpeg56 but it is not installable > E: Unable to correct problems, you have held broken packages. > -- Where is this package from? There is no "jitsi" in Debian (anymore) so it must be unofficial. When packages are built against ffmpeg they should get a dependency like this which should work with libavcodec-extra: libavcodec57 (>= 7:3.4.3) | libavcodec-extra57 (>= 7:3.4.3) Probably the jitsi packages itself is at fault, or something else is preventing the installation. > I'm not really familiar with DPKG, but I think it could be solved if > the manifest of dpkg-archive from 'libavcodec-extra57' includes a > > -- > [...] > Provides: libavcodec57 > [...] > -- Unfortunately this won't work because it won't satisfy versioned dependencies. If versioned provides was working properly everywhere then possibly it could be used, but I don't think it does yet (although I'm happy to be corrected!). James signature.asc Description: OpenPGP digital signature
Bug#904163: libavcodec-extra57 should PROVIDE package libavcodec57
Package: libavcodec-extra57 Version: 7:3.4.3-1 Severity: normal Tags: d-i Dear Maintainer, I try to install a backport package which is depending on package 'libavcodec57'. But I have installed the package libavcodec-extra57 on my machine. If I try to install it, I get the following error: -- root$> apt-get install jitsi Reading package lists... Done Building dependency tree Reading state information... Done 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: jitsi : Depends: libavcodec57 but it is not going to be installed or libavcodec-ffmpeg56 but it is not installable E: Unable to correct problems, you have held broken packages. -- I'm not really familiar with DPKG, but I think it could be solved if the manifest of dpkg-archive from 'libavcodec-extra57' includes a -- [...] Provides: libavcodec57 [...] -- Greetz, Dirk =) -- System Information: Debian Release: buster/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.16.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=de_DE, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to de_DE.UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) (ignored: LC_ALL set to de_DE.UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages libavcodec-extra57 depends on: ii libavutil55 7:3.4.3-1 ii libc6 2.27-3 ii libcairo2 1.15.10-3 ii libcrystalhd3 1:0.0~git20110715.fdd2f19-13 ii libglib2.0-02.56.1-2 ii libgsm1 1.0.13-4+b2 ii liblzma55.2.2-1.3 ii libmp3lame0 3.100-2+b1 ii libopencore-amrnb0 0.1.3-2.1+b2 ii libopencore-amrwb0 0.1.3-2.1+b2 ii libopenjp2-72.3.0-1 ii libopus01.3~beta+20180518-1 ii librsvg2-2 2.40.20-2 ii libshine3 3.1.1-2 ii libsnappy1v51.1.7-1 ii libspeex1 1.2~rc1.2-1+b2 ii libswresample2 7:3.4.3-1 ii libtheora0 1.1.1+dfsg.1-14+b1 ii libtwolame0 0.3.13-4 ii libva2 2.1.0-3 ii libvo-amrwbenc0 0.1.3-1+b1 ii libvorbis0a 1.3.6-1 ii libvorbisenc2 1.3.6-1 ii libvpx5 1.7.0-3 ii libwavpack1 5.1.0-3 ii libwebp60.6.1-2 ii libwebpmux3 0.6.1-2 ii libx264-152 2:0.152.2854+gite9a5903-2 ii libx265-160 2.8-4 ii libxvidcore42:1.3.5-1 ii libzvbi00.2.35-13 ii zlib1g 1:1.2.11.dfsg-1 libavcodec-extra57 recommends no packages. libavcodec-extra57 suggests no packages. -- debconf-show failed
