Before packages did not had to set `format = "other";` if had a custom
installPhase and would not produce a dist folder.
The current error message is hard to understand by new users:
> Executing pythonOutputDistPhase
> mv: cannot stat 'dist': No such file or directory
This commit improves the error message.
BEFORE:
the python derivation did not contain .nativeDrv and .crossDrv because
it was not from the __splicedPackages set
the python used in mk-python-derivation.nix was for host
```
nix-repl> pkgsCross.aarch64-multiplatform.python3Packages.xpybutil.nativeBuildInputs
[ «derivation /nix/store/bhz39ds4v02hn6x4py4mzjyilw4a589h-python3-aarch64-unknown-linux-gnu-3.10.7.drv» «derivation /nix/store/v880cnh4ml7czmivfbk3cdh93hz9yvbn-hook.drv» «derivation /nix/store/f243ab7wv92gqsmc9h7gr0qcnj0xcgdb-hook.drv» «derivation /nix/store/880lf8895bzn8d94lrr2y7ilgkxq0lc4-python-remove-tests-dir-hook.drv» «derivation /nix/store/fzjnhawfs1wpw58hcd1vxd9y750dc08y-python-remove-bin-bytecode-hook.drv» «derivation /nix/store/n8l59iparx98yfw8g5ydqmzmk3fdic75-setuptools-setup-hook.drv» «deri→
```
AFTER:
the python derivation does contain .nativeDrv and .crossDrv because
it is from the __splicedPackages set
those 2 are what makes nativeBuildInputs and buildInputs function
properly
the python used in mk-python-derivation.nix is for build
```
nix-repl> pkgsCross.aarch64-multiplatform.python3Packages.xpybutil.nativeBuildInputs
[ «derivation /nix/store/hvb9yxgv1133cfhxxd869sibldvv2vdx-python3-3.10.7.drv» «derivation /nix/store/v880cnh4ml7czmivfbk3cdh93hz9yvbn-hook.drv» «derivation /nix/store/f243ab7wv92gqsmc9h7gr0qcnj0xcgdb-hook.drv» «derivation /nix/store/880lf8895bzn8d94lrr2y7ilgkxq0lc4-python-remove-tests-dir-hook.drv» «derivation /nix/store/fzjnhawfs1wpw58hcd1vxd9y750dc08y-python-remove-bin-bytecode-hook.drv» «derivation /nix/store/n8l59iparx98yfw8g5ydqmzmk3fdic75-setuptools-setup-hook.drv» «derivation /nix/store/7vyhynla→
```
Since the Nix command used is an implementation detail of the script,
it's the script that will have to be updated if the command changes,
it's the script that should be opting into this, rather than making
the user do it globally.
Since c0972c16dc ("update-python-libraries: add missing dependency nix"),
Nix will be provided as a dependency, so we know we'll always be using
a modern version and no longer need the fallback.
*Flags implies a list
slightly relevant:
> stdenv: start deprecating non-list configureFlags https://github.com/NixOS/nixpkgs/pull/173172
the makeInstalledTests function in `nixos/tests/installed-tests/default.nix` isn't available outside of nixpkgs so
it's not a breaking change
By default buildPython* runs a hook for detecting conflicting packages.
This hook needs pkg_resources which is part of setuptools.
Before this commit, setuptools was simply added to the build. This meant
that when setuptools was forgotten to be added to the build, the build
and installation would still succeed because of this package from the
hook. During runtime (and cross-compilation) one would notice the
missing package.
Store the intermediate artifacts. In time, we should build, install and
test in separate derivations as that reduces circular dependencies,
avoids rebuilds when fixing tests, and makes it possible to use the
wheels for creating say virtualenv's.
Jörg Thalheim