Re: How to download source package using only console?

["Alexander V. Makartsev" <avbetev@gmail.com>]

On 14.05.2023 10:06, Vincent Lefevre wrote:

> On 2023-05-14 00:15:39 +0500, Alexander V. Makartsev wrote:
> > Hello, fellow Debian users.
> >
> > When I need to build a backport of a package, I sometimes find it difficult
> > to obtain actual source package(-s) from Debian repos using console.
> > Following advice from a wiki page [1], after "apt update", doesn't do it:
> >
> >    $ apt source lego/testing
> >    Reading package lists... Done
> >    Picking 'golang-github-xenolf-lego' as source package instead of 'lego'
> >    E: Can not find version '3.2.0-3.1' of package 'lego'
> >    E: Unable to find a source package for golang-github-xenolf-lego
> >       
> zira:~> apt-show-versions -a lego
> lego:amd64 3.2.0-3.1+b5 stable   ftp.debian.org
> No stable-updates version
> lego:amd64 4.9.1-1      testing  ftp.debian.org
> lego:amd64 4.9.1-1      unstable ftp.debian.org
> No experimental version
> lego:amd64 not installed
>
> Indeed, 3.2.0-3.1 is no longer the testing version. Your database
> seems to be out-of-date.
>
>     
    I think you haven't noticed that I requested for "4.9.1-1" version
    from "testing" specifically,
    hence why the command was "$ apt source lego/testing" not just "$
    apt source lego".
    There is no reason for building a backport package for "stable"
    using a source package from "stable"...
    
    I've changed all my repo mirrors to "deb.debian.org" suspecting the
    previous mirror I used was somehow out-of-date. Why is my output
    differ from yours?
> $ apt-show-versions -a lego
>       lego:amd64 3.2.0-3.1+b5 bullseye
>         deb.debian.org
>       No proposed-updates version
>       No stable-updates version
>       No testing version
>       No unstable version
>       lego:amd64 not installed
>       lego:i386 3.2.0-3.1+b5 bullseye
>         deb.debian.org
>       No proposed-updates version
>       No stable-updates version
>       No testing version
>       No unstable version
>       lego:i386 not installed
>     
    Yet "rmadison" reports there is a version "4.9.1-1" available in
    "testing":
> $ rmadison lego
>       lego       | 0.3.1-5+b13   | oldstable  |
>         amd64, arm64, armel, armhf, i386, mips, mips64el, mipsel,
>         ppc64el, s390x
>       lego       | 3.2.0-3.1+b5  | stable     |
>         amd64, arm64, armel, armhf, i386, mips64el, mipsel, ppc64el,
>         s390x
>       lego       | 4.9.1-1       | testing    |
>         amd64, arm64, armel, armhf, i386, mips64el, mipsel, ppc64el,
>         s390x
>       lego       | 4.9.1-1       | unstable   |
>         amd64, arm64, armel, armhf, i386, mips64el, mipsel, ppc64el,
>         s390x
>     
    I suspect "apt-show-versions" output is inconsistent because I only
    request "deb-src" from "testing" in "sources.list", as I've shown
    before.
    
    Here is another example package that works as expected:
> $ rmadison roundcube
>       roundcube  |
>         1.3.17+dfsg.1-1~deb10u2         | oldstable        | source, all
>       roundcube  |
>         1.4.13+dfsg.1-1~deb11u1~bpo10+1 | buster-backports | source, all
>       roundcube  |
>         1.4.13+dfsg.1-1~deb11u1         | stable           | source, all
>       roundcube  |
>         1.6.1+dfsg-1                    | testing          | source, all
>       roundcube  |
>         1.6.1+dfsg-1                    | unstable         | source, all
>     
> $ apt-show-versions -a roundcube
>       roundcube:all 1.4.13+dfsg.1-1~deb11u1
>         bullseye          deb.debian.org
>       roundcube:all 1.4.13+dfsg.1-1~deb11u1
>         bullseye-security deb.debian.org
>       No proposed-updates version
>       No stable-updates version
>       No testing version
>       No unstable version
>       roundcube:all not installed
>     
> $ apt source roundcube/testing
>       Reading package lists... Done
>       Selected version '1.6.1+dfsg-1' (testing)
>         for roundcube
>       ...
>     
    
    I did some additional research and I think I got it.
    "lego" package is special because its source package is named
    differently:
> $ rmadison
> golang-github-xenolf-lego                                                                                                         
>          
>       golang-github-xenolf-lego | 0.3.1-5       |
>         oldstable      |
> source                                                                                                 
>          
>       golang-github-xenolf-lego | 3.2.0-3.1     |
>         stable         |
> source                                                                                                 
>          
>       golang-github-xenolf-lego | 4.9.1-1       |
>         testing        |
> source                                                                                                 
>          
>       golang-github-xenolf-lego | 4.9.1-1       |
>         unstable       |
> source                                                                                                 
>          
>       golang-github-xenolf-lego | 4.9.1-1       |
>         unstable-debug |
> source                                                                                                 
>          
>     
> $ apt source
> golang-github-xenolf-lego/testing                                                                                               
>          
>       Reading package lists...
> Done                                                                                                                                       
>          
>       Selected version '4.9.1-1' (testing) for
>         golang-github-xenolf-lego
>         ...
>       
>     
    But why "apt" doesn't play along, since it knows the source package
    for "lego" has different name, but ignores the "testing" part of the
    request?
> $ apt source lego/testing
>       Reading package lists... Done
>       Picking 'golang-github-xenolf-lego' as
>         source package instead of 'lego'
>       E: Can not find version '3.2.0-3.1' of
>         package 'lego'
>       E: Unable to find a source package for
>         golang-github-xenolf-lego
>     
    
    Looks like an "apt" bug to me.

--
With kindest regards, Alexander.

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