Hi Christoph,
Christoph Buck <d...@icepic.de> writes:
Hi!
How do i define a new package which is just a variation of a
given
package defined in guix?
In my concrete example i try to add a new board definition file
via a
patch to the u-boot bootloader. What i come up with, looks like
this:
```
;; Defines a package ub which will compile u-boot for the
;; `new-cool-board` description file
(define ub (make-u-boot-package "new-cool-board"
"arm-linux-gnueabihf"))
(define-public u-boot-new-cool-board-arm
(package
(inherit ub)
(version "2024.01")
(source (origin
(patches
'("0001-Add-board-description-for-new-cool-board.patch"))
(method url-fetch)
(uri (string-append
"https://ftp.denx.de/pub/u-boot/";
"u-boot-" version ".tar.bz2"))
(sha256
(base32
"1czmpszalc6b8cj9j7q6cxcy19lnijv3916w3dag6yr3xpqi35mr"))))))
```
I create a u-boot variant for my "new-cool-board" using the
build in
`make-u-boot-package` function, then i define a new package and
inherit
from the package variant created with the `make-u-boot-package`
function. Then i overwrite `source` entry with an entry which
also
applies my patch file. This works, however the original u-boot
package
also apply some patches, which are now lost and must manually
added by
me again. This seems rather error prone. Is there a better
solution?
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.
— Ian
