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Python: add buildPythonPackage.overridePythonPackage method.

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This allows one to always override the call to `buildPythonPackage`.

In the following example we create an environment where we have the `blaze` package using an older version of `pandas`. We override first the Python interpreter and pass `packageOverrides` which contains the overrides for packages in
the package set.

```
with import <nixpkgs> {};

(let
  python = let
    packageOverrides = self: super: {
      pandas = super.pandas.overridePythonPackage(old: rec {
        version = "0.19.1";
        name = "pandas-${version}";
        src =  super.fetchPypi {
          pname = "pandas";
          inherit version;
          sha256 = "08blshqj9zj1wyjhhw3kl2vas75vhhicvv72flvf1z3jvapgw295";
        };
      });
    };
  in pkgs.python3.override {inherit packageOverrides;};

in python.withPackages(ps: [ps.blaze])).env
```
This commit is contained in:
Frederik Rietdijk
2017-03-21 10:08:10 +01:00
parent 90282d95bd
commit 345b35c48a
2 changed files with 52 additions and 6 deletions
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39
doc/languages-frameworks/python.md
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@@ -545,6 +545,35 @@ All parameters from `mkDerivation` function are still supported.
* `catchConflicts` If `true`, abort package build if a package name appears more than once in dependency tree. Default is `true`.
* `checkInputs` Dependencies needed for running the `checkPhase`. These are added to `buildInputs` when `doCheck = true`.
##### Overriding Python packages
The `buildPythonPackage` function has a `overridePythonPackage` method that
can be used to override the package. In the following example we create an
environment where we have the `blaze` package using an older version of `pandas`.
We override first the Python interpreter and pass
`packageOverrides` which contains the overrides for packages in the package set.
```nix
with import <nixpkgs> {};
(let
python = let
packageOverrides = self: super: {
pandas = super.pandas.overridePythonPackage(old: rec {
version = "0.19.1";
name = "pandas-${version}";
src = super.fetchPypi {
pname = "pandas";
inherit version;
sha256 = "08blshqj9zj1wyjhhw3kl2vas75vhhicvv72flvf1z3jvapgw295";
};
});
};
in pkgs.python3.override {inherit packageOverrides;};
in python.withPackages(ps: [ps.blaze])).env
```
#### `buildPythonApplication` function
The `buildPythonApplication` function is practically the same as `buildPythonPackage`.
@@ -754,17 +783,17 @@ In the following example we rename the `pandas` package and build it.
```nix
with import <nixpkgs> {};
let
(let
python = let
packageOverrides = self: super: {
pandas = super.pandas.override {name="foo";};
pandas = super.pandas.overridePythonPackage(old: {name="foo";});
};
in pkgs.python35.override {inherit packageOverrides;};
in python.pkgs.pandas
in python.withPackages(ps: [ps.pandas])).env
```
Using `nix-build` on this expression will build the package `pandas`
but with the new name `foo`.
Using `nix-build` on this expression will build an environment that contains the
package `pandas` but with the new name `foo`.
All packages in the package set will use the renamed package.
A typical use case is to switch to another version of a certain package.