106 lines
4.1 KiB
Nix
106 lines
4.1 KiB
Nix
{ pkgs
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, stdenv
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, lib
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, python
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}:
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self:
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let
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inherit (self) callPackage;
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namePrefix = python.libPrefix + "-";
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# Derivations built with `buildPythonPackage` can already be overridden with `override`, `overrideAttrs`, and `overrideDerivation`.
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# This function introduces `overridePythonAttrs` and it overrides the call to `buildPythonPackage`.
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makeOverridablePythonPackage = f: lib.mirrorFunctionArgs f (origArgs:
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let
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args = lib.fix (lib.extends
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(_: previousAttrs: {
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passthru = (previousAttrs.passthru or { }) // {
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overridePythonAttrs = newArgs: makeOverridablePythonPackage f (overrideWith newArgs);
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};
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})
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(_: origArgs));
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result = f args;
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overrideWith = newArgs: args // (if pkgs.lib.isFunction newArgs then newArgs args else newArgs);
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in
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if builtins.isAttrs result then result
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else if builtins.isFunction result then {
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overridePythonAttrs = newArgs: makeOverridablePythonPackage f (overrideWith newArgs);
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__functor = self: result;
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}
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else result);
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mkPythonDerivation = if python.isPy3k then
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./mk-python-derivation.nix
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else
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./python2/mk-python-derivation.nix;
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buildPythonPackage = makeOverridablePythonPackage (lib.makeOverridable (callPackage mkPythonDerivation {
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inherit namePrefix; # We want Python libraries to be named like e.g. "python3.6-${name}"
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inherit toPythonModule; # Libraries provide modules
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}));
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buildPythonApplication = makeOverridablePythonPackage (lib.makeOverridable (callPackage mkPythonDerivation {
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namePrefix = ""; # Python applications should not have any prefix
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toPythonModule = x: x; # Application does not provide modules.
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}));
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# Check whether a derivation provides a Python module.
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hasPythonModule = drv: drv?pythonModule && drv.pythonModule == python;
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# Get list of required Python modules given a list of derivations.
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requiredPythonModules = drvs: let
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modules = lib.filter hasPythonModule drvs;
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in lib.unique ([python] ++ modules ++ lib.concatLists (lib.catAttrs "requiredPythonModules" modules));
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# Create a PYTHONPATH from a list of derivations. This function recurses into the items to find derivations
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# providing Python modules.
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makePythonPath = drvs: lib.makeSearchPath python.sitePackages (requiredPythonModules drvs);
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removePythonPrefix = lib.removePrefix namePrefix;
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# Convert derivation to a Python module.
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toPythonModule = drv:
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drv.overrideAttrs( oldAttrs: {
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# Use passthru in order to prevent rebuilds when possible.
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passthru = (oldAttrs.passthru or {})// {
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pythonModule = python;
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pythonPath = [ ]; # Deprecated, for compatibility.
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requiredPythonModules =
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builtins.addErrorContext
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"while calculating requiredPythonModules for ${drv.name or drv.pname}:"
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(requiredPythonModules drv.propagatedBuildInputs);
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};
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});
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# Convert a Python library to an application.
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toPythonApplication = drv:
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drv.overrideAttrs( oldAttrs: {
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passthru = (oldAttrs.passthru or {}) // {
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# Remove Python prefix from name so we have a "normal" name.
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# While the prefix shows up in the store path, it won't be
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# used by `nix-env`.
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name = removePythonPrefix oldAttrs.name;
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pythonModule = false;
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};
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});
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disabled = drv: throw "${removePythonPrefix (drv.pname or drv.name)} not supported for interpreter ${python.executable}";
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disabledIf = x: drv: if x then disabled drv else drv;
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in {
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inherit lib pkgs stdenv;
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inherit (python.passthru) isPy27 isPy37 isPy38 isPy39 isPy310 isPy311 isPy3k isPyPy pythonAtLeast pythonOlder;
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inherit buildPythonPackage buildPythonApplication;
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inherit hasPythonModule requiredPythonModules makePythonPath disabled disabledIf;
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inherit toPythonModule toPythonApplication;
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python = toPythonModule python;
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# Don't take pythonPackages from "global" pkgs scope to avoid mixing python versions.
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# Prevent `pkgs/top-level/release-attrpaths-superset.nix` from recursing more than one level here.
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pythonPackages = self // { __attrsFailEvaluation = true; };
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}
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