Store path in package definition

Store path in package definition

[Saku Laesvuori]

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Hi,

I'm writing a package definition for
[passff-host](https://github.com/passff/passff-host) which requires a
file to reference another file with an absolute path (passff.json must
reference passff.py). How can I get the resulting store path to patch it
to the file? I would assume I have to do something with gexps but
couldn't figure it out by reading the documentation.

- Saku Laesvuori

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Store path in package definition

[Nathan Dehnel]

Would something like this work?

(string-append (assoc-ref %outputs "out") "/passff.py")

https://guix.gnu.org/cookbook/en/html_node/Extended-example.html#Build-system-arguments

Re: Store path in package definition

[(]

On Fri Aug 26, 2022 at 9:39 PM BST, Nathan Dehnel wrote:
> (string-append (assoc-ref %outputs "out") "/passff.py")

s/\(assoc-ref %outputs "out"\)/#$output/ :)

    -- (

Re: Store path in package definition

[Tobias Geerinckx-Rice]

Hi,

On 26 August 2022 20:39:55 UTC, Nathan Dehnel <ncdehnel@gmail.com> wrote:
>Would something like this work?
>
>(string-append (assoc-ref %outputs "out") "/passff.py")

Consider this deprecated.  It's unreliable and even where it appears to work can break for what seems to be no reason when, e.g., cross-compiling.

Modulo typos, and indentation being weird because 'phone,

(arguments
 (list
  #:make-flags
  #~(list (string-append "HELLO=" #$output "/bin/hello"))
  #:phases
  #~(modify-phases %standard-phases
     (add-after 'unpack 'option-one
      (lambda _
       (substitute* "foo.c"
        (("hello")
         (string-append #$output "/bin/hello")))))
     (add-after 'unpack 'option-two
      (lambda* (#:key outputs #:allow-other-keys
       (let ((out (assoc-ref outputs "out")))
        (substitute* "foo.c"
         (("hello")
         (string-append out "/bin/hello"))))))))))

From what you describe it sounds like you're using a phase, but I included make-flags to show that they work the same way.

I used to prefer option one, but actually prefer option two nowadays, because it's less magical.

>https://guix.gnu.org/cookbook/en/html_node/Extended-example.html#Build-system-arguments

This should be updated.





Kind regards,

T G-R

Sent on the go.  Excuse or enjoy my brevity.

Re: Store path in package definition

[Hartmut Goebel]

Am 25.08.22 um 21:21 schrieb Saku Laesvuori:
> I'm writing a package definition for
> [passff-host](https://github.com/passff/passff-host) which requires a
> file to reference another file with an absolute path (passff.json must
> reference passff.py). How can I get the resulting store path to patch it
> to the file? I would assume I have to do something with gexps but
> couldn't figure it out by reading the documentation.

Please have a look at

- phase set-python-file-name of python-ipykernel

or

- phase call-wrapper-not-wrapped-snakemake of snakemake

HTH

-- 
Regards
Hartmut Goebel

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

Re: Store path in package definition

[Saku Laesvuori]

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> Modulo typos, and indentation being weird because 'phone,
> 
> (arguments
>  (list
>   #:make-flags
>   #~(list (string-append "HELLO=" #$output "/bin/hello"))
>   #:phases
>   #~(modify-phases %standard-phases
>      (add-after 'unpack 'option-one
>       (lambda _
>        (substitute* "foo.c"
>         (("hello")
>          (string-append #$output "/bin/hello")))))
>      (add-after 'unpack 'option-two
>       (lambda* (#:key outputs #:allow-other-keys
>        (let ((out (assoc-ref outputs "out")))
>         (substitute* "foo.c"
>          (("hello")
>          (string-append out "/bin/hello"))))))))))

Thanks all. I got that part working. Unfortunately I found out that
firefox/icecat tries to find native messaging manifests only from a
hardcoded /usr/lib/... path so packaging a native messaging host
manifest is impossible without patching the browser (as far as I know).

- Saku Laesvuori

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