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

[Bas van Dijk]

Awesome function indeed!

TIL there exists builtins.match and it's not documented in the manual[1].

I would like to switch from my whitelistSource to your sourceByRegex so a
PR would be much appreciated indeed.

Bas

[1] http://nixos.org/nix/manual/#ssec-builtins

On 17 February 2017 at 11:16, Thomas Hunger <tehunger at gmail.com> wrote:

> 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)
>>
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>>
>>
>
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