Re: Apply a patch to a given package definition

[Ian Eure]

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