How to tell which repositories provide which packages?

[Chris Green]

On Tue, Jan 05, 2021 at 06:17:10PM -0500, Little Girl wrote:
> Hey there,
> 
> Chris Green wrote:
> >Little Girl wrote:
>    
> >> This will give you your installed version, the candidate version
> >> that's available (if any), and the sources for the various
> >> versions:
> >> 
> >> apt-cache policy PACKAGENAME
> >>   
> >This doesn't really tell me the truth:-
> 
> You're right. It apparently only works on packages that aren't
> installed by PPAs.
> 
> I looked up Syncthing and it hasn't got an official PPA, so you'll
> want to look in Synaptic or /etc/apt/sources.list
> or /var/lib/apt/lists to find out what the repository name is. Then
> you can run this command, replacing REPOSITORYNAME with the specific
> name for the PPA for that program:
> 
> awk '$1 == "Package:" { print
> $2 }' /var/lib/apt/lists/repo.REPOSITORYNAME*Packages
> 
> >> If you're feeling frisky, either of these will probably give you
> >> way more information that you need, but can be good to keep in
> >> your back pocket:
> >> 
> >> dpkg -s PACKAGENAME
> >> 
> >> apt-cache showpkg PACKAGENAME
> >>   
> >Neither of these seems to show anything about the PPA.
> 
> The second one gives me some PPA information for the Vivaldi PPA when
> I do this:
> 
> apt-cache showpkg vivaldi-stable
> 
> The "File" lines were the results I was after, so I refined the
> command a bit:
> 
> apt-cache showpkg vivaldi-stable | grep File
> 
> That uses the "vivaldi-stable" package name to give me the repository
> information I needed for use in the above command.
> 
> So, to recap, if I have a package name, I can use it in this command
> to get its PPA name, which is right after "repo" in the results:
> 
> apt-cache showpkg PACKAGENAME | grep File
> 
> Then I can follow that by inserting the repository name I got from
> that command into this command to get all the packages installed by
> that PPA:
> 
> awk '$1 == "Package:" { print
> $2 }' /var/lib/apt/lists/repo.REPOSITORYNAME*Packages
> 
Yes, but the whole problem is that I want to know if *any* packages
are being installed from repository XXXX.  There might be none, in
which case I can remove the files from /etc/apt/sources.list.d

-- 
Chris Green