[Nix-dev] Explicitly selecting sources for "src" in stdenv.mkDerivation?

[Thomas Hunger]

Thanks for your replies everyone!

Bas - your "toString" helped me over the finishing line. Pretty obvious in
hindsight to use toString to force evaluation of src. I adapted your code
to this:

sourceByRegex = src: regexes: builtins.filterSource (path: type:
    let relPath = lib.removePrefix (toString src + "/") (toString path);
    in lib.any (re: builtins.match re relPath != null) regexes)
  src;

To be used like this:

sourceByRegex /tmp/sourcetest [".*hs$", "someTestFile"]

And then I have some predefined lists like cabalProject = [".*\.cabal$",
".*\.hs"]

~



On 16 February 2017 at 21:58, Bas van Dijk <v.dijk.bas at gmail.com> wrote:

> At LumiGuide we're using the following function in our Haskell packages:
>
>   # Copy everything under src into the Nix store except those paths that
> don't
>   # have one of the specified allowedPrefixes.
>   whitelistSource = src: allowedPrefixes:
>     builtins.filterSource
>       (path: type:
>         lib.any (allowedPrefix: lib.hasPrefix (toString (src + "/${
> allowedPrefix}")) path)
>                 allowedPrefixes)
>       src;
>
> To be used as for example:
>
>   src = lib.whitelistSource ./. [
>           "lumi-central-server.cabal"
>           "src"
>           "default.conf"
>         ];
>
> Bas
>
> Op 16 feb. 2017 13:14 schreef "Thomas Hunger" <tehunger at gmail.com>:
>
> Hi,
>
> I am consistently struggling with the following in nix: I have a
> repository and I want to specify derivations for some local sub-projects.
> The obvious solution is
>
>   src = ./subproject-A;
>
> But that pulls in everything in that directory, including build artifacts,
> or random intermediate data files.
>
> Another solution is
>
>   src = sourceFilesBySuffices ./subproject-A [".cabal" ".hs"];
>
> Which works reasonably well but introduces this weird dance where I suffix
> files so they can be matched by sourceFilesBySuffices. Mostly I want to do
> this:
>
>   src = [ ./subproject-A/schema.sql ./subproject-A/lib ];
>
> Or even get all the files checked into git:
>
>   src = gitFiles ./subproject-A; # does not work
>
> I was wondering whether any of you have this issue, and if you do: how do
> you solve it?
>
> ~
>
> (see also https://github.com/NixOS/nix/issues/885)
>
> _______________________________________________
> nix-dev mailing list
> nix-dev at lists.science.uu.nl
> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.science.uu.nl/pipermail/nix-dev/attachments/20170217/c3b2f8b3/attachment.html>