2021-12-13 17:48:44 +02:00
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# Release X.Y (202?-??-??)
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2021-12-21 15:19:21 +02:00
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2022-09-16 11:59:24 +03:00
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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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2022-11-14 16:03:53 +02:00
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* If `builtins.readFile` is called on a file with context, then only the parts
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of that context that appear in the content of the file are retained.
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This avoids a lot of spurious errors where some benign strings end-up having
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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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2022-11-23 16:24:50 +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. these UIDs are allocated starting at
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872415232 on Linux and 56930 on macOS.
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This is an experimental feature. To enable it, add the following to
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`nix.conf`:
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```
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extra-experimental-features = auto-allocate-uids
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auto-allocate-uids = true
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```
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* On Linux, Nix can now run builds in a user namespace where the build
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runs as root (UID 0) and has 65,536 UIDs available. This is
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primarily useful for running containers such as `systemd-nspawn`
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inside a Nix build.
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A build can enable this by requiring the `uid-range` system feature,
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i.e. 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 (see above).
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* On Linux, Nix has experimental support for running builds inside a
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cgroup. It can be enabled by adding
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```
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extra-experimental-features = cgroups
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```
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to `nix.conf`. It is also automatically enabled for builds that
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require the `uid-range` system feature.
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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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