python: implement PEP 668 (#229166)
Add a marker file to the python outputs that tells pip and other tooling following PEP 668 that they should not be installing things system-wide. This provides better feedback to the user and also potentially avoids issues in single-user installs where the /nix/store is owned by the user. For more details, see <https://peps.python.org/pep-0668/> Here is how it currently looks like: $ pip install requests error: externally-managed-environment × This environment is externally managed ╰─> This command has been disabled as it tries to modify the immutable `/nix/store` filesystem. To use Python with Nix and nixpkgs, have a look at the online documentation: <https://nixos.org/manual/nixpkgs/stable/#python>.
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@ -24,6 +24,8 @@ In addition to numerous new and upgraded packages, this release has the followin
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- KDE Plasma has been updated to v5.27, see [the release notes](https://kde.org/announcements/plasma/5/5.27.0/) for what is changed.
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- Python implements [PEP 668](https://peps.python.org/pep-0668/), providing better feedback to users that try to run `pip install` system-wide.
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- `nixos-rebuild` now supports an extra `--specialisation` option that can be used to change specialisation for `switch` and `test` commands.
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- `libxcrypt`, the library providing the `crypt(3)` password hashing function, is now built without support for algorithms not flagged [`strong`](https://github.com/besser82/libxcrypt/blob/v4.4.33/lib/hashes.conf#L48). This affects the availability of password hashing algorithms used for system login (`login(1)`, `passwd(1)`), but also Apache2 Basic-Auth, Samba, OpenLDAP, Dovecot, and [many other packages](https://github.com/search?q=repo%3ANixOS%2Fnixpkgs%20libxcrypt&type=code).
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@ -486,6 +486,16 @@ in with passthru; stdenv.mkDerivation {
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# bytecode compilations for the same reason - we don't want bytecode generated.
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mkdir -p $out/share/gdb
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sed '/^#!/d' Tools/gdb/libpython.py > $out/share/gdb/libpython.py
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# Disable system-wide pip installation. See https://peps.python.org/pep-0668/.
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cat <<'EXTERNALLY_MANAGED' > $out/lib/${libPrefix}/EXTERNALLY-MANAGED
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[externally-managed]
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Error=This command has been disabled as it tries to modify the immutable
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`/nix/store` filesystem.
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To use Python with Nix and nixpkgs, have a look at the online documentation:
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<https://nixos.org/manual/nixpkgs/stable/#python>.
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EXTERNALLY_MANAGED
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'';
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preFixup = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
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