[Nix-dev] fetchcvs - proposal / What does the prefetch do now?

[Eelco Dolstra]

Marc Weber wrote:
> Why modifying it at all? 
> Using the current fetcvs builder you are not able to export
> '-D2007-20-10'
> which is the only option if you don't want to use NOW (which breakes
> things) if the author hasn't created tagnames .. (Or am I wrong here?)

No, you indeed need to be able to specify a date/time if there are no tags.

>   # example tags:
>   # "-DNOW" (get current version)
>   # "-D2007-20-10" (get the last version before given date)
>   # "-r <tagname>" (get version by tag name)
>   {stdenv, cvs, nix}: {url, module, tag, sha256}:

This doesn't look so nice, since you can put arbitrary arguments to CVS in
"tag".  Wouldn't it be better to have separate "tag" and "date" arguments?  I.e.

fetchCVS { ...; tag = "foo"; } would map to `cvs -r "foo"', and
fetchCVS { ...; date = "2007-20-10"; } would map to `cvs -D "2007-20-10"', and

-- 
Eelco Dolstra | http://www.cs.uu.nl/~eelco