Re: [PATCH] guix: lint: Check for version-only origin file names.

[Ludovic Courtès]

Eric Bavier <address@hidden> skribis:

> From 0311d5b383003600ac43d3a9bfdec0ad3c398db2 Mon Sep 17 00:00:00 2001
> From: Eric Bavier <address@hidden>
> Date: Sun, 23 Aug 2015 18:00:45 -0500
> Subject: [PATCH] guix: lint: Check for version-only origin file names.
>
> * guix/scripts/lint.scm (check-source): Emit warning if source filename
>   contains only the version of the package.
> * tests/lint.scm ("source: filename", "source: filename v",
>   "source: filename valid"): New tests.
> * doc/guix.texi (Invoking guix lint): Mention file name check.
> Offending packages updated.

This is useful, thanks for looking into it.

I would prefer it to make a separate linter, like ‘source-file-name’.
The reason is that ‘source’ is a relatively expensive check, since it
needs to probe URLs (so you might want to skip it in some cases),
whereas the linter your propose is lightweight.

WDYT?

> --- a/gnu/packages/algebra.scm
> +++ b/gnu/packages/algebra.scm
> @@ -386,6 +386,7 @@ cosine/ sine transforms or DCT/DST).")
>                (method url-fetch)
>                (uri (string-append "https://bitbucket.org/eigen/eigen/get/";
>                                    version ".tar.bz2"))
> +              (file-name (string-append name "-" version ".tar.bz2"))

Could you make these package updates a separate patch?  Some may trigger
large rebuilds, so you may have to keep them for ‘core-updates’ or such.

> +  (define (origin-version-name? origin)
> +    ;; Return #t if the source file name contains only a version; indicates
> +    ;; that the origin needs a 'file-name' field.
> +    (let ((filename (store-path-package-name
> +                     (with-store store
> +                       (derivation->output-path
> +                        (package-source-derivation store origin)))))
> +          (version (package-version package)))
> +      (or (string-prefix? version filename)
> +          ;; Common in many projects is for the filename to start with a "v"
> +          ;; followed by the version, e.g. "v3.2.0.tar.gz".
> +          (string-prefix? (string-append "v" version) filename))))

Opening a connection to the store in the middle of the code
(‘with-store’) is Bad Practice.  ;-)

I think this can actually be made simpler, with something akin to what
‘node-full-name’ does in guix/scripts/graph.scm.  Maybe we could extract
an ‘origin-actual-file-name’ procedure from that and move it to (guix
packages).  WDYT?

> +(test-assert "source: filename"

“file name” (two words).

Could you send an updated patch?

Thanks,
Ludo’.