Python: use fixed point combinator #16784
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Move Python interpreters (CPython, PyPy) to same folder and share layout.
FRidh
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$ nix-shell -E 'with import <nixpkgs> {}; (pkgs.pythonNew.cpython35.withPackages (ps: [ps.django])).env' -I nixpkgs=~/Code/libraries/nixpkgs
these derivations will be built:
/nix/store/sh46h5s4azs3x06hb72by2qs1ccp85y4-python3-3.5.1-env.drv
building path(s) ‘/nix/store/l520qidycrz8m7p1d40f6vmfd1048i66-python3-3.5.1-env’
collision between `/nix/store/7kxhz3g05w60vrg01jv8g1jbax7ffx5c-python3-3.5.1/bin/easy_install-3.5' and `/nix/store/8j34nkm96s19znxvj7bnbs9dhicki0gp-python3.5m-setuptools-19.4/bin/easy_install-3.5'
builder for ‘/nix/store/sh46h5s4azs3x06hb72by2qs1ccp85y4-python3-3.5.1-env.drv’ failed with exit code 25
error: build of ‘/nix/store/sh46h5s4azs3x06hb72by2qs1ccp85y4-python3-3.5.1-env.drv’ failed
/run/current-system/sw/bin/nix-shell: failed to build all dependencies@bennofs do you have any idea how I broke it here? |
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I will continue with this further but will close it now since it can't be merged anyway in this state. |
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Dec 5, 2016
Use a fixed-point combinator for the Python package set to allow easier overriding of its contents. Earlier implementations were proposed in NixOS#16784 and NixOS#17428. This commit is by comparison much smaller and changes only what is needed.
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Motivation for this change
Curious to see how we could use a fixed-point combinator like is done with Haskell. This should make it a lot easier when we have #16005 in. But, this is going to break a lot of code.
Notes:
pythonNew.cpython35.interpreterorpythonNew.cpython35.pkgs.pythonpythonNew.cpython35.interpreter, and thenpythonNew.cpython35toolzpackage:pythonNew.cpython35.pkgs.toolzpythonNew.cpython35.buildEnvorpythonNew.cpython35.withpackagesThings done
(nix.useChroot on NixOS,
or option
build-use-chrootinnix.confon non-NixOS)
nix-shell -p nox --run "nox-review wip"./result/bin/)This is mostly just an experiment. I think if we're going this direction we might have to find a way to keep the current route working.