68052b5619
Documents the reason why it's needed and also prevents the ensureNewerSourcesHook call being evaluated again and again for every single Python package.
108 lines
3.2 KiB
Nix
108 lines
3.2 KiB
Nix
# Generic builder.
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{ lib
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, python
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, wrapPython
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, setuptools
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, unzip
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, ensureNewerSourcesForZipFilesHook
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# Whether the derivation provides a Python module or not.
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, toPythonModule
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, namePrefix
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}:
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{ name ? "${attrs.pname}-${attrs.version}"
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# Build-time dependencies for the package
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, nativeBuildInputs ? []
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# Run-time dependencies for the package
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, buildInputs ? []
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# Dependencies needed for running the checkPhase.
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# These are added to buildInputs when doCheck = true.
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, checkInputs ? []
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# propagate build dependencies so in case we have A -> B -> C,
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# C can import package A propagated by B
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, propagatedBuildInputs ? []
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# DEPRECATED: use propagatedBuildInputs
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, pythonPath ? []
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# used to disable derivation, useful for specific python versions
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, disabled ? false
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# Raise an error if two packages are installed with the same name
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, catchConflicts ? true
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# Additional arguments to pass to the makeWrapper function, which wraps
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# generated binaries.
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, makeWrapperArgs ? []
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# Skip wrapping of python programs altogether
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, dontWrapPythonPrograms ? false
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# Remove bytecode from bin folder.
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# When a Python script has the extension `.py`, bytecode is generated
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# Typically, executables in bin have no extension, so no bytecode is generated.
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# However, some packages do provide executables with extensions, and thus bytecode is generated.
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, removeBinBytecode ? true
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, meta ? {}
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, passthru ? {}
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, doCheck ? false
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, ... } @ attrs:
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# Keep extra attributes from `attrs`, e.g., `patchPhase', etc.
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if disabled
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then throw "${name} not supported for interpreter ${python.executable}"
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else
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toPythonModule (python.stdenv.mkDerivation (builtins.removeAttrs attrs [
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"disabled" "checkInputs" "doCheck" "doInstallCheck" "dontWrapPythonPrograms" "catchConflicts"
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] // {
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name = namePrefix + name;
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nativeBuildInputs = [ ensureNewerSourcesForZipFilesHook ]
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++ nativeBuildInputs;
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buildInputs = [ wrapPython ]
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++ lib.optional (lib.hasSuffix "zip" (attrs.src.name or "")) unzip
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++ lib.optionals doCheck checkInputs
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++ lib.optional catchConflicts setuptools # If we no longer propagate setuptools
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++ buildInputs
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++ pythonPath;
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# Propagate python and setuptools. We should stop propagating setuptools.
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propagatedBuildInputs = propagatedBuildInputs ++ [ python setuptools ];
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# Python packages don't have a checkPhase, only an installCheckPhase
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doCheck = false;
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doInstallCheck = doCheck;
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postFixup = lib.optionalString (!dontWrapPythonPrograms) ''
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wrapPythonPrograms
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'' + lib.optionalString removeBinBytecode ''
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if [ -d "$out/bin" ]; then
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rm -rf "$out/bin/__pycache__" # Python 3
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find "$out/bin" -type f -name "*.pyc" -delete # Python 2
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fi
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'' + lib.optionalString catchConflicts ''
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# Check if we have two packages with the same name in the closure and fail.
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# If this happens, something went wrong with the dependencies specs.
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# Intentionally kept in a subdirectory, see catch_conflicts/README.md.
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${python.interpreter} ${./catch_conflicts}/catch_conflicts.py
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'' + attrs.postFixup or '''';
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meta = {
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# default to python's platforms
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platforms = python.meta.platforms;
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isBuildPythonPackage = python.meta.platforms;
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} // meta;
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}))
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