A nice nix-shell for Odoo

Since I recently switch to nixos and I’m working with odoo for a project, I had to update my debianesk habits and take what nixos has probably best to offer: an ultra-customized and optimized development environment using nix-shell.

This comes at the cost of extra readings and code, but the result offer a great flexibility. Now with 2 simple files I’m can load the whole environment and its dependencies just by cd‘ing in my project’s folder.

Beforehand, one needs to setup Direnv as described in the nix-shell doc.

Then, the following shell.nix file will suffice to load the whole environment when entering its folder:

{ pkgs ? import  {} }:
pkgs.mkShell {
  name = "odoo-env";
  buildInputs = with pkgs; [ python3 xclip openldap cyrus_sasl postgresql ];
  src = null;
  shellHook = ''
    # Allow the use of wheels.
    SOURCE_DATE_EPOCH=$(date +%s)

    VENV=.venv
    if test ! -d $VENV; then
      python -m venv $VENV
      source $VENV/bin/activate
      pip install -r requirements.txt
    fi
    source $VENV/bin/activate

    export PYTHONPATH=`pwd`/$VENV/${pkgs.python.sitePackages}/:$PYTHONPATH
    # export LD_LIBRARY_PATH=${with pkgs; lib.makeLibraryPath [ libGL xorg.libX11 xorg.libXext xorg.libXrender stdenv.cc.cc mtdev ]}
  '';
}

Just a note about odoo’s dependencies on nixos. I haven’t been able to install proprely pyldap 2.4.28 which is the required version for odoo 12. Instead I installed the version 3.0.0 which seems to do just fine with odoo 12 as well. To do so, I updated the requirements.txtfile and changed this line

pyldap==2.4.28; sys_platform != 'win32'

with the appropriate version

pyldap==3; sys_platform != 'win32'