units: fix build with enableCurrenciesUpdater=false; pythonPackages=null; #182172
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Description of changes
Units allows to build it without a python dependency by setting { enableCurrenciesUpdater=false; pythonPackages=null; }. Unfortunately this feature is currently broken due to two problems:
The
pythonEnv
string is part of the builder environment, so it is not evaluated lazily. This means thatpythonPackages==null
will always cause eval to fail.pythonEnv
is used unconditionally in an antiquotation in theprePatch
phase; if it is null this will fail.Let's fix these so we can build a pythonless "units" package.
This is helpful when cross-compiling, because right now a lot of python packages (especially python-cryptography) fail to cross-compile.
Things done
nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD"
. Note: all changes have to be committed, also see nixpkgs-review usage./result/bin/
)