Re: streamlining custom package development

[Przemysław Kamiński]

As for an example. Clone this repository

https://github.com/sras/servant-examples

Then cd into it and run

cat servant-examples.cabal | guix import hackage -s -r

The '-s' option reads from stdin, the '-r' option imports everything 
recursively.

It throws this output:

Starting download of /tmp/guix-file.TykbjO
From 
https://hackage.haskell.org/package/servant-examples/servant-examples-0.1.0.0.tar.gz...
download failed 
"https://hackage.haskell.org/package/servant-examples/servant-examples-0.1.0.0.tar.gz"; 
404 "Not Found"

Starting download of /tmp/guix-file.TykbjO
From 
https://web.archive.org/web/20230307175126/https://hackage.haskell.org/package/servant-examples/servant-examples-0.1.0.0.tar.gz...
download failed 
"https://web.archive.org/web/20230307175126/https://hackage.haskell.org/package/servant-examples/servant-examples-0.1.0.0.tar.gz"; 
404 "NOT FOUND"
Trying to use Disarchive to assemble /tmp/guix-file.TykbjO...
could not find its Disarchive specification
failed to download "/tmp/guix-file.TykbjO" from 
"https://hackage.haskell.org/package/servant-examples/servant-examples-0.1.0.0.tar.gz";
Syntax error: unexpected end of input
Syntax error: unexpected end of input
(define-public ghc-servant-examples
  (package
    (name "ghc-servant-examples")
    (version "0.1.0.0")
    (source (origin
              (method url-fetch)
              (uri (hackage-uri "servant-examples" version))
              (sha256
               (base32
                "failed to download tar archive"))))
    (build-system haskell-build-system)
    (properties '((upstream-name . "servant-examples")))
    (inputs (list ghc-servant
                  ghc-servant-server
                  ghc-servant-swagger
                  ghc-swagger2
                  ghc-wai
                  ghc-aeson
                  ghc-warp))
    (home-page "https://github.com/githubuser/servant-examples#readme";)
    (synopsis "")
    (description "")
    (license license:bsd-3)))


My guess the "Syntax error" is from the missing "ghc-servant-swagger" 
package.

Also, the source should be changed to (local-file "./" #:recursive? #t) 
but I guess the stdin option can't guess that. I guess one should add an 
'-f' option to read the .cabal file.

Anyways, it seems the "-r" option doesn't work here. I was expecting 
"ghc-servant-swagger" to be defined as well.

P.

On 7.03.2023 17:02, Ludovic Courtès wrote:
> Hi,
>
> Przemysław Kamiński <cgenie@pm.me> skribis:
>
> > 3. I run `guix build -L <my-custom-guix-package-dir> -m manifest.scm
> > (manifest only contains a reference to ghc-stuff.scm)
> > 4. I get an error which looks like this:
> > View build log at
> > '/var/log/guix/drvs/j2/wa3vw49l78m85z74x91sklqxwhx87y-ghc-hwodr-0.1.0.drv.bz2'
> >
> > so I fire up
> >
> > bunzip --stdout
> > '/var/log/guix/drvs/j2/wa3vw49l78m85z74x91sklqxwhx87y-ghc-hwodr-0.1.0.drv.bz2'
> >
> > and see that I am missing some Haskell packages.
>
> Note that the build log should be just above the “View build log” line
> if you scroll up a little bit.  :-)
>
> Otherwise, like Simon said, I’d recommend getting package definitions by
> running ‘guix import hackage -r’, assuming said packages are on Hackage.
> That should simplify things.
>
> HTH,
> Ludo’.

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