The art of guessing a packaged downgrade version of a package

The art of guessing a packaged downgrade version of a package

[swedebugia]

(trying to get gnupg to work knowing that ludo runs some 2.0 version)
~/src/guix$ guix package -i gnupg:2.0.0 -r gnupg
guix package: error: package `gnupg-2.1.10' lacks output `2.0.0'

I would like to improve this command by making it either show me the 
valid outputs (and optionally choosing one of them to install) for this 
specific package OR hint me about running:
guix package --show=gnupg
~$ guix package --show=gnupg
name: gnupg
version: 2.1.10
outputs: out
...

name: gnupg
version: 2.0.29
outputs: out
...

name: gnupg
version: 1.4.20
outputs: out

to get the information I need.

I found the relevant code in:
../gnu/packages.scm:381:        (leave (_ "package `~a' lacks output 
`~a'~%")

To be able myself to improve this snippet I would have to learn a lot 
more Guile first. :p

Anybody care to help?

swedebugia

Re: The art of guessing a packaged downgrade version of a package

[Leo Famulari]

On Fri, Jan 01, 2016 at 09:35:40PM +0100, swedebugia@riseup.net wrote:
> (trying to get gnupg to work knowing that ludo runs some 2.0 version)
> ~/src/guix$ guix package -i gnupg:2.0.0 -r gnupg
> guix package: error: package `gnupg-2.1.10' lacks output `2.0.0'

Did you try `guix package -i gnupg-2.0.29`? That should put the 2.0
series gnupg in your profile. You can even specify just 'gnupg-2.0' and
Guix will pick the lastest available gnupg in the '2.0' series.

> 
> I would like to improve this command by making it either show me the valid
> outputs (and optionally choosing one of them to install) for this specific
> package OR hint me about running:
> guix package --show=gnupg

I see the value of hints, but never an interactive command as suggested
by a menu of valid outputs. Interactive commands break automation.

> ~$ guix package --show=gnupg
> name: gnupg
> version: 2.1.10
> outputs: out
> ...
> 
> name: gnupg
> version: 2.0.29
> outputs: out
> ...
> 
> name: gnupg
> version: 1.4.20
> outputs: out
> 
> to get the information I need.
> 
> I found the relevant code in:
> ../gnu/packages.scm:381:        (leave (_ "package `~a' lacks output
> `~a'~%")
> 
> To be able myself to improve this snippet I would have to learn a lot more
> Guile first. :p
> 
> Anybody care to help?
> 
> swedebugia
> 

Re: The art of guessing a packaged downgrade version of a package

[swedebugia]

On 2016-01-01 22:09, Leo Famulari wrote:
> On Fri, Jan 01, 2016 at 09:35:40PM +0100, swedebugia@riseup.net wrote:
>> (trying to get gnupg to work knowing that ludo runs some 2.0 version)
>> ~/src/guix$ guix package -i gnupg:2.0.0 -r gnupg
>> guix package: error: package `gnupg-2.1.10' lacks output `2.0.0'
> 
> Did you try `guix package -i gnupg-2.0.29`? That should put the 2.0
> series gnupg in your profile. You can even specify just 'gnupg-2.0' and
> Guix will pick the lastest available gnupg in the '2.0' series.
> 
>> 
>> I would like to improve this command by making it either show me the 
>> valid
>> outputs (and optionally choosing one of them to install) for this 
>> specific
>> package OR hint me about running:
>> guix package --show=gnupg
> 
> I see the value of hints, but never an interactive command as suggested
> by a menu of valid outputs. Interactive commands break automation.

Okay. I added some hints to the error messages and will submit a patch 
soon.

Re: The art of guessing a packaged downgrade version of a package

[Ludovic Courtès]

swedebugia@riseup.net skribis:

> ~/src/guix$ guix package -i gnupg:2.0.0 -r gnupg
> guix package: error: package `gnupg-2.1.10' lacks output `2.0.0'

The colon sign is (currently) used to delimit output names, not version
numbers.  To select a version, use “gnupg-2.0” as Leo suggests.  See the
documentation of --install at
<http://www.gnu.org/software/guix/manual/html_node/Invoking-guix-package.html>.

Ludo’.