bug#29088: Superseded package is not rebuild if native dependency changes

bug#29088: Superseded package is not rebuild if native dependency changes

[Hartmut Goebel]

Hi,

the package "gpgmepp" depends on native input "extra-cmake-modules".
However if the alter is changed, gpgmepp is not rebuild.

How to reproduce

    git checkout master # important: without
    http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29087 applied

    ./pre-inst-env guix build gpgmepp

now apply http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29087

    ./pre-inst-env guix build extra-cmake-modules # the package changed
    by patch 29087

    ./pre-inst-env guix build gpgmepp
    guix build: package 'gpgmepp' has been superseded by 'gpgme'
    /gnu/store/ky8p7lllm9h9sv1zy0f742r1cc6qbd1l-gpgme-1.9.0

This does *not* rebuild gpgmepp, but simply return the old store-path.

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |

bug#29088: Superseded package is not rebuild if native dependency changes

[Ludovic Courtès]

Hi,

Hartmut Goebel <h.goebel@crazy-compilers.com> skribis:

> the package "gpgmepp" depends on native input "extra-cmake-modules".
> However if the alter is changed, gpgmepp is not rebuild.
>
> How to reproduce
>
>     git checkout master # important: without
>     http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29087 applied
>
>     ./pre-inst-env guix build gpgmepp
>
> now apply http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29087
>
>     ./pre-inst-env guix build extra-cmake-modules # the package changed
>     by patch 29087
>
>     ./pre-inst-env guix build gpgmepp
>     guix build: package 'gpgmepp' has been superseded by 'gpgme'
>     /gnu/store/ky8p7lllm9h9sv1zy0f742r1cc6qbd1l-gpgme-1.9.0
>
> This does *not* rebuild gpgmepp, but simply return the old store-path.

Superseded packages cannot be built/installed unwillingly.  In the
example above, what you built is “gpgme”, not “gpgmepp”, which is why
any changes to “gpgmepp” had no effect.

To force a build of the superseded package, you can run:

  guix build -e '(@ (gnu packages kde-frameworks) gpgmepp)'

But again, the intended meaning of superseded packages is that they are
superseded and must no longer be used.

So to me this can be closed as “not a bug.”

HTH!

Ludo’.

bug#29088: Superseded package is not rebuild if native dependency changes

[Hartmut Goebel]

Am 31.10.2017 um 23:27 schrieb Ludovic Courtès:
> Superseded packages cannot be built/installed unwillingly.  In the
> example above, what you built is “gpgme”, not “gpgmepp”, which is why
> any changes to “gpgmepp” had no effect.

IC. Indeed I missed that a different package was build. So I agree, this
is not a bug.

But i suggest to emit a more verbose message in this case, e.g.:

guix build: package 'gpgmepp'
will not be build, since it       <<--- new
has been superseded by 'gpgme'.
'gpgme' will be build instead.    <<--- new

Or (maybe easier to implement:
guix build: package 'gpgmepp' has been superseded by 'gpgme'.
Thus 'gpgme' will be build instead of 'gpgmepp'.        <<--- new

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |

bug#29088: Superseded package is not rebuild if native dependency changes

[Ludovic Courtès]

Hi Hartmut,

Hartmut Goebel <h.goebel@crazy-compilers.com> skribis:

> Am 31.10.2017 um 23:27 schrieb Ludovic Courtès:
>> Superseded packages cannot be built/installed unwillingly.  In the
>> example above, what you built is “gpgme”, not “gpgmepp”, which is why
>> any changes to “gpgmepp” had no effect.
>
> IC. Indeed I missed that a different package was build. So I agree, this
> is not a bug.
>
> But i suggest to emit a more verbose message in this case, e.g.:
>
> guix build: package 'gpgmepp'
> will not be build, since it       <<--- new
> has been superseded by 'gpgme'.
> 'gpgme' will be build instead.    <<--- new
>
> Or (maybe easier to implement:
> guix build: package 'gpgmepp' has been superseded by 'gpgme'.
> Thus 'gpgme' will be build instead of 'gpgmepp'.        <<--- new

I see your point, but I’m not entirely convinced.  :-)  After all, the
name that appears, be it at the end of ‘guix build’ or in the profile
created by ‘guix package’, is “gpgme”, not “gpgmepp”.

We could make the messages more verbose, but in general it’s unclear
that it would help.

However, that’s another situation where colored output could help make
useful messages more visible.

Thanks,
Ludo’.