2022-12-06 14:55:09 +02:00
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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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2023-07-19 12:57:20 +03:00
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This can be used by requiring `uid-range` [system feature] in derivations.
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2022-12-06 14:55:09 +02:00
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2022-12-13 16:49:40 +02:00
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[system feature]: ../command-ref/conf-file.md#conf-system-features
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2022-12-06 14:55:09 +02:00
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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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2022-12-13 16:49:40 +02:00
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[`auto-allocate-uids`]: ../command-ref/conf-file.md#conf-auto-allocate-uids
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2022-12-06 14:55:09 +02:00
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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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