[Nix-dev] Developing Haskell packages that use the FFI

[Charles Strahan]

Ian,

I have a pull request open that fixes hs-mesos:
https://github.com/NixOS/nixpkgs/pull/6824

Now, regarding ZFS:

The latest ZFS release doesn't include pkgconfig files (they were added
recently, though[1]). I'll see if I can backport the files to the
latest release in nixpkgs. Regardless, you should be able to use
zfs_git in nixpkgs, which does have the files. You should be able to do
something like:

{ mkDerivation, pkgs}: mkDerivation { # ... extraLibraries= [
pkgs.zfs_git ]; # ... }

And in your .cabal file:

pkgconfig-depends: libzfs

-Charles

On Sun, Mar 15, 2015, at 03:30 PM, Charles Strahan wrote:
> Hey Ian,
>
> It looks like the version of protobuf is propogated by the the
> pythonProtobuf passed in to the mesos package, which uses protobuf
> 2.6. Does that need to be 2.5 (or some other version)? It looks like
> the version of protobuf that mesos build is using is the one packaged
> with the source, so it might be that the version of the python package
> should be different, and we just haven't noticed it yet.
>
> I'm not sure about the libzfs problem, though. Assuming libzfs
> includes a proper pkg-config setup, you should be able to add
> `pkgconfig' to the list of buildInputs, and I think Cabal should get
> the correct paths (e.g. the $PKG_CONFIG_PATH variable should
> automatically be configured properly).
>
> I'm interested in using your hs-mesos package, so I'd be more than
> happy to help you work out the kinks on #nixos (I'm cstrahan) or some
> other medium.
>
> -Charles
>
> On Fri, Mar 6, 2015, at 11:36 PM, Ian Duncan wrote:
>> Hi there,


>> I’m pretty new to NixOS, and I’m trying to get into using it for
>> Haskell development. So far, I’ve been following the guide here
>> (http://wiki.ocharles.org.uk/Nix) with moderate success for libraries
>> that don’t directly need to interact with C/C++ libraries. However,
>> I’ve got some projects that I’m working on that use “picky” libraries
>> (for lack of a better term).


>> To be specific, I’ve got two packages that I’m working on that are
>> giving me grief:


>>  * I’m working on a package that depends on the hs-mesos cabal
>>    package, but I’m ending up with the wrong version of the C++
>>    protobuf library (incompatible headers) due to Nix somehow
>>    automatically picking up the wrong protobuf dependency for using
>>    the mesos C++ headers. How can I configure what version of
>>    protobuf is used for mesos / hs-mesos? My shell.nix is:


>> with (import <nixpkgs> {}).pkgs;
(haskellngPackages.callPackage ./. {}).env
>>
>> And my default.nix is:


>> { mkDerivation, base, hs-mesos, hzk, lens, stdenv, stm }:
mkDerivation { pname = "mesotron"; version = "0.1.0.0"; src = ./.;
isLibrary = false; isExecutable = true; buildDepends = [ base hs-mesos
hzk lens stm ]; license = stdenv.lib.licenses.unfree; }
>>
>>  * Similarly, I’m trying to write Haskell bindings for libzfs, don’t
>>    know how to pull in the zfs dependency properly. This one seems to
>>    be more complex– I need to add something like
>>    ${zfs}/include/libspl & ${zfs}/include/libzfs to the include
>>    paths, but even after doing that, I get macro recursion errors in
>>    glib? In file included from
>>    /nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/include/unistd.h:610:0:
    , from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/unistd.h:28,
    from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/sys/param.h:32,
    from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/sys/types.h:34,
    from
    /nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/include/stdlib.h:315,
    from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/stdlib.h:28,
    from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/assert.h:34,
    from
    /nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libzfs/libzfs.h:34,
    from src/ZFS.hs:4:

/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/include/bits/confname.h:201:0:
error: detected recursion whilst expanding macro "_SC_UIO_MAXIOV"
_SC_IOV_MAX = _SC_UIO_MAXIOV, ^

/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/include/bits/confname.h:497:0:
error: detected recursion whilst expanding macro
"_SC_LEVEL1_ICACHE_SIZE" _SC_IPV6 = _SC_LEVEL1_ICACHE_SIZE + 50, ^

In file included from
/nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libzfs/libzfs.h:34:0:
, from src/ZFS.hs:4:

/nix/store/g6d4ddw286x57m5drm905fhnqac68i8q-zfs-user-0.6.3-1.2/include/libspl/assert.h:39:0:
error: detected recursion whilst expanding macro "stderr"
fprintf(stderr, "%s:%i: %s: Assertion `%s` failed.\n", ^
>>
>> Anyways, these questions are kind of ill-formed, for which I
>> apologize. I’m not really sure what I’m missing here, and I just
>> don’t have enough experience with Nix yet to understand what I’m
>> doing wrong.


>>


>>
>>
>>
>> – Ian Duncan
>>
>>


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Links:

  1. https://github.com/zfsonlinux/zfs/issues/585
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