Re: Apply a patch to a given package definition

[Ian Eure <ian@retrospec.tv>]

Hi Cristoph,

Christoph Buck <dev@icepic.de> writes:

> Hi Ian!
>
>> You can have your source inherit from the original package’s, 
>> but with
>> modifications -- just like the package itself.  This might not 
>> be
>> exaxtly right, but should give you the right idea:
>>
>>    (define-public u-boot-new-cool-board-arm
>>      (package
>>        (inherit ub)
>>        (version "2024.01")
>>        (source
>>         (origin
>>           (inherit (package-source ub))
>>           (patches (append (origin-patches (package-source ub))
>>                            '("0001-Add-board-description-for-new-cool-board.patch")))))))
>>
>> Any fields you don’t want to modify will be inherited, so you 
>> may be
>> able to eliminate the version field as well.
>
> Oh i didn't know i can use inherit for all all (?) record 
> types. On
> hindsight it is pretty obvious. Thanks! Your solution works 
> perfect!
>

Yes, it’s very handy.  I’m glad my suggestion was helpful.

>
> By chance, do you know if a transformation would also work and 
> if so,
> how?
>

I’ve never messed with package transformations, so I don’t know.

Thanks,

  — Ian