[Nix-dev] Error build python27Packages

[Tinker Thaler]

I'm getting a error trying to nix-build the python27Packages

    nix-build -A python27Packages

The error I get is:

    avro3k-1.7.7-SNAPSHOT not supported for interpreter python2.7
(see more details below)

Some questions:

* Of course: what could be the problem and how can I solve it?
* I tried debugging a bit but I haven't found yet how I would be able to
inspect the value of a variable (e.g. I'd like to see the value of isPy3k)

If I remove the disabled check:

    #disabled = (!isPy3k);

then it starts to build but obviously fails

AssertionError: This requires Python 3
builder for
‘/nix/store/g9f35hx3fg9a05d69w060117k19f2k9z-python2.7-avro3k-1.7.7-SNAPSHOT.drv’
failed with exit code 1
error: build of
‘/nix/store/g9f35hx3fg9a05d69w060117k19f2k9z-python2.7-avro3k-1.7.7-SNAPSHOT.drv’
failed

(and if I comment out the avro3k section I get a similar error afterwards
on mutag)

More details:

Error without making any changes

git clone git://github.com/NixOS/nixpkgs.git nixpkgs2
$ nix-build -A python27Packages -v --show-trace
evaluating file
‘/nix/store/5xk3w1b9np5s5r7y67bc32mrbnpd7gly-nix-1.8/share/nix/corepkgs/derivation.nix’
evaluating file ‘/src/nixpkgs2/pkgs/top-level/all-packages.nix’
evaluating file ‘/src/nixpkgs2/pkgs/stdenv/adapters.nix’
evaluating file ‘/src/nixpkgs2/pkgs/build-support/trivial-builders.nix’
evaluating file ‘/home/tinkerthaler/.nixpkgs/config.nix’
evaluating file ‘/src/nixpkgs2/lib/default.nix’
|   evaluating file ‘/src/nixpkgs2/lib/trivial.nix’
|   evaluating file ‘/src/nixpkgs2/lib/lists.nix’
|   evaluating file ‘/src/nixpkgs2/lib/strings.nix’
|   evaluating file ‘/src/nixpkgs2/lib/strings-with-deps.nix’
|   evaluating file ‘/src/nixpkgs2/lib/attrsets.nix’
|   evaluating file ‘/src/nixpkgs2/lib/sources.nix’
|   evaluating file ‘/src/nixpkgs2/lib/options.nix’
|   evaluating file ‘/src/nixpkgs2/lib/types.nix’
|   evaluating file ‘/src/nixpkgs2/lib/meta.nix’
|   evaluating file ‘/src/nixpkgs2/lib/debug.nix’
|   evaluating file ‘/src/nixpkgs2/lib/misc.nix’
|   evaluating file ‘/src/nixpkgs2/lib/modules.nix’
|   evaluating file ‘/src/nixpkgs2/lib/systems.nix’
|   evaluating file ‘/src/nixpkgs2/lib/customisation.nix’
evaluating file ‘/src/nixpkgs2/pkgs/stdenv/default.nix’
evaluating file ‘/src/nixpkgs2/pkgs/stdenv/linux/default.nix’
evaluating file ‘/src/nixpkgs2/pkgs/stdenv/generic/default.nix’
evaluating file ‘/src/nixpkgs2/pkgs/top-level/python-packages.nix’
evaluating file ‘/src/nixpkgs2/pkgs/servers/x11/xorg/default.nix’
evaluating file
‘/src/nixpkgs2/pkgs/development/interpreters/python/2.7/default.nix’
evaluating file ‘/src/nixpkgs2/pkgs/development/libraries/zlib/default.nix’
evaluating file ‘/src/nixpkgs2/pkgs/top-level/python-packages-generated.nix’
evaluating file
‘/src/nixpkgs2/pkgs/development/python-modules/generic/default.nix’
error: while evaluating anonymous function at
"/src/nixpkgs2/lib/meta.nix":42:54, called from
"/src/nixpkgs2/lib/attrsets.nix":135:52:
while evaluating ‘isDerivation’ at "/src/nixpkgs2/lib/attrsets.nix":222:18,
called from "/src/nixpkgs2/lib/meta.nix":42:62:
while evaluating the attribute ‘"${attr}"’ at
"/src/nixpkgs2/pkgs/top-level/python-packages.nix":603:3:
while evaluating ‘lowPrio’ at "/src/nixpkgs2/lib/meta.nix":48:13, called
from "/src/nixpkgs2/pkgs/top-level/python-packages.nix":603:12:
while evaluating ‘addMetaAttrs’ at "/src/nixpkgs2/lib/meta.nix":16:28,
called from "/src/nixpkgs2/lib/meta.nix":48:18:
while evaluating ‘makeOverridable’ at
"/src/nixpkgs2/lib/customisation.nix":56:24, called from
"/src/nixpkgs2/pkgs/top-level/python-packages.nix":603:26:
while evaluating anonymous function at
"/src/nixpkgs2/pkgs/development/python-modules/generic/default.nix":8:1,
called from "/src/nixpkgs2/lib/customisation.nix":58:12:
avro3k-1.7.7-SNAPSHOT not supported for interpreter python2.7

If useful

$ nix-env -q --installed
cabal2nix-1.72
emacs-24.4
firefox-34.0.5
git-2.1.4
haskell-xmonad-contrib-ghc7.8.4-0.11.3-shared
haskell-xmonad-extras-ghc7.8.4-0.12-shared
haskell-xmonad-ghc7.8.4-0.11-shared
mtools-4.0.18
nix-prefetch-scripts
screen-4.2.1
slim-1.3.6
sublimetext3-3065
syslinux-6.03
unetbootin-608
vim-7.4.131
wmctrl-1.07
xwininfo-1.1.3

$ echo $NIX_PATH
/nix/var/nix/profiles/per-user/root/channels/nixos:nixpkgs=/etc/nixos/nixpkgs:nixos-config=/etc/nixos/configuration.nix

$ ll /etc/nixos/nixpkgs
lrwxrwxrwx 1 root root 52 Jan  2 22:56 /etc/nixos/nixpkgs ->
/nix/var/nix/profiles/per-user/root/channels/nixpkgs
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