Re: Per-package updaters?

[Efraim Flashner]

On Sat, Dec 31, 2016 at 01:29:15AM +0100, Ludovic Courtès wrote:
> Hello Guix!
> 
> Ricardo Wurmus <address@hidden> skribis:
> 
> > we have a couple of generic package updaters (CPAN, CRAN, Bioconductor,
> > Github, GNU, etc), but they don’t nearly cover all of our packages.  I
> > wonder if we should add one-off updaters for individual packages that
> > don’t fall into any of the generic classes of updaters.
> >
> > Another question is how to implement them.  Would there be another
> > optional field in package expressions containing a Guile script to run
> > to determine updates for the current package?
> >
> > What are your opinions on this?
> 
> Currently we have ways to provide the generic updates with additional
> hints.  For instance, we can provide hints to the ‘gnu’ updater:
> 
>   (define-public guile-next
>     (package (inherit guile-2.0)
>       (name "guile-next")
>       ;; …
>       (properties '((upstream-name . "guile")
>                     (ftp-server . "alpha.gnu.org")
>                     (ftp-directory . "/gnu/guile")))))
> 
> I suspect that one-off updaters would most likely use methods very
> close to the existing updaters.  For instance, we could have a generic
> FTP updater that would apply to all packages available on FTP; or we
> could have a generic updater that crawls HTML pages for release numbers
> and such things.  Then we would have optional properties in packages to
> specify which method to use, or something along these lines.
> 
> WDYT?  Do you have examples in mind?
> 

Sourceforge has an rss feed for each project they host. For example, for
libcddb: https://sourceforge.net/projects/libcddb/rss

Another example is Debian, which has a "watch file" that does something™,
for example cairo's:
https://sources.debian.net/src/cairo/1.14.8-1/debian/watch/

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