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44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
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# Release 2.12 (2022-12-06)
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* On Linux, Nix can now run builds in a user namespace where they run
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as root (UID 0) and have 65,536 UIDs available.
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<!-- FIXME: move this to its own section about system features -->
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This is primarily useful for running containers such as `systemd-nspawn`
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inside a Nix build. For an example, see [`tests/systemd-nspawn/nix`][nspawn].
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[nspawn]: https://github.com/NixOS/nix/blob/67bcb99700a0da1395fa063d7c6586740b304598/tests/systemd-nspawn.nix.
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A build can enable this by setting the derivation attribute:
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```
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requiredSystemFeatures = [ "uid-range" ];
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```
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The `uid-range` [system feature] requires the [`auto-allocate-uids`]
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setting to be enabled.
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[system feature]: (../command-ref/conf-file.md#conf-system-features)
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* Nix can now automatically pick UIDs for builds, removing the need to
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create `nixbld*` user accounts. See [`auto-allocate-uids`].
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[`auto-allocate-uids`]: (../command-ref/conf-file.md#conf-auto-allocate-uids)
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* On Linux, Nix has experimental support for running builds inside a
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cgroup. See
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[`use-cgroups`](../command-ref/conf-file.md#conf-use-cgroups).
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* `<nix/fetchurl.nix>` now accepts an additional argument `impure` which
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defaults to `false`. If it is set to `true`, the `hash` and `sha256`
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arguments will be ignored and the resulting derivation will have
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`__impure` set to `true`, making it an impure derivation.
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* If `builtins.readFile` is called on a file with context, then only
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the parts of the context that appear in the content of the file are
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retained. This avoids a lot of spurious errors where strings end up
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having a context just because they are read from a store path
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([#7260](https://github.com/NixOS/nix/pull/7260)).
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* `nix build --json` now prints some statistics about top-level
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derivations, such as CPU statistics when cgroups are enabled.
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